source: G950FXXS5DSI1

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / net / wireless / bcmdhd4361 / dhd_msgbuf.c

/**
 * @file definition of host message ring functionality
 * Provides type definitions and function prototypes used to link the
 * DHD OS, bus, and protocol modules.
 *
 * Copyright (C) 1999-2019, Broadcom.
 *
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 *
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 *
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 *
 *
 * <<Broadcom-WL-IPTag/Open:>>
 *
 * $Id: dhd_msgbuf.c 818370 2019-05-07 11:39:47Z $
 */

#include <typedefs.h>
#include <osl.h>

#include <bcmutils.h>
#include <bcmmsgbuf.h>
#include <bcmendian.h>

#include <dngl_stats.h>
#include <dhd.h>
#include <dhd_proto.h>

#include <dhd_bus.h>

#include <dhd_dbg.h>
#include <siutils.h>
#include <dhd_debug.h>

#include <dhd_flowring.h>

#include <pcie_core.h>
#include <bcmpcie.h>
#include <dhd_pcie.h>

#if defined(DHD_LB)
#include <linux/cpu.h>
#include <bcm_ring.h>
#define DHD_LB_WORKQ_SZ                     (8192)
#define DHD_LB_WORKQ_SYNC           (16)
#define DHD_LB_WORK_SCHED           (DHD_LB_WORKQ_SYNC * 2)
#endif /* DHD_LB */

#include <etd.h>
#include <hnd_debug.h>
#include <bcmtlv.h>
#include <hnd_armtrap.h>
#include <dnglevent.h>

#ifdef DHD_PKT_LOGGING
#include <dhd_pktlog.h>
#endif /* DHD_PKT_LOGGING */

extern char dhd_version[];
extern char fw_version[];

/**
 * Host configures a soft doorbell for d2h rings, by specifying a 32bit host
 * address where a value must be written. Host may also interrupt coalescing
 * on this soft doorbell.
 * Use Case: Hosts with network processors, may register with the dongle the
 * network processor's thread wakeup register and a value corresponding to the
 * core/thread context. Dongle will issue a write transaction <address,value>
 * to the PCIE RC which will need to be routed to the mapped register space, by
 * the host.
 */
/* #define DHD_D2H_SOFT_DOORBELL_SUPPORT */

/* Dependency Check */
#if defined(IOCTLRESP_USE_CONSTMEM) && defined(DHD_USE_STATIC_CTRLBUF)
#error "DHD_USE_STATIC_CTRLBUF is NOT working with DHD_USE_OSLPKT_FOR_RESPBUF"
#endif /* IOCTLRESP_USE_CONSTMEM && DHD_USE_STATIC_CTRLBUF */

#define RETRIES 2               /* # of retries to retrieve matching ioctl response */

#define DEFAULT_RX_BUFFERS_TO_POST      256
#define RXBUFPOST_THRESHOLD                     32
#define RX_BUF_BURST                            32 /* Rx buffers for MSDU Data */

#define DHD_STOP_QUEUE_THRESHOLD        200
#define DHD_START_QUEUE_THRESHOLD       100

#define RX_DMA_OFFSET           8 /* Mem2mem DMA inserts an extra 8 */
#define IOCT_RETBUF_SIZE        (RX_DMA_OFFSET + WLC_IOCTL_MAXLEN)

/* flags for ioctl pending status */
#define MSGBUF_IOCTL_ACK_PENDING        (1<<0)
#define MSGBUF_IOCTL_RESP_PENDING       (1<<1)

#define DHD_IOCTL_REQ_PKTBUFSZ          2048
#define MSGBUF_IOCTL_MAX_RQSTLEN        (DHD_IOCTL_REQ_PKTBUFSZ - H2DRING_CTRL_SUB_ITEMSIZE)

#define DMA_ALIGN_LEN           4

#define DMA_D2H_SCRATCH_BUF_LEN 8
#define DMA_XFER_LEN_LIMIT      0x400000

#ifdef BCM_HOST_BUF
#ifndef DMA_HOST_BUFFER_LEN
#define DMA_HOST_BUFFER_LEN     0x200000
#endif // endif
#endif /* BCM_HOST_BUF */

#define DHD_FLOWRING_IOCTL_BUFPOST_PKTSZ                8192

#define DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D          1
#define DHD_FLOWRING_MAX_EVENTBUF_POST                  32
#define DHD_FLOWRING_MAX_IOCTLRESPBUF_POST              8
#define DHD_H2D_INFORING_MAX_BUF_POST                   32
#define DHD_MAX_TSBUF_POST                      8

#define DHD_PROT_FUNCS  43

/* Length of buffer in host for bus throughput measurement */
#define DHD_BUS_TPUT_BUF_LEN 2048

#define TXP_FLUSH_NITEMS

/* optimization to write "n" tx items at a time to ring */
#define TXP_FLUSH_MAX_ITEMS_FLUSH_CNT   48

#define RING_NAME_MAX_LENGTH            24
#define CTRLSUB_HOSTTS_MEESAGE_SIZE             1024
/* Giving room before ioctl_trans_id rollsover. */
#define BUFFER_BEFORE_ROLLOVER 300

/* 512K memory + 32K registers */
#define SNAPSHOT_UPLOAD_BUF_SIZE        ((512 + 32) * 1024)

struct msgbuf_ring; /* ring context for common and flow rings */

/**
 * PCIE D2H DMA Complete Sync Modes
 *
 * Firmware may interrupt the host, prior to the D2H Mem2Mem DMA completes into
 * Host system memory. A WAR using one of 3 approaches is needed:
 * 1. Dongle places a modulo-253 seqnum in last word of each D2H message
 * 2. XOR Checksum, with epoch# in each work item. Dongle builds an XOR checksum
 *    writes in the last word of each work item. Each work item has a seqnum
 *    number = sequence num % 253.
 *
 * 3. Read Barrier: Dongle does a host memory read access prior to posting an
 *    interrupt, ensuring that D2H data transfer indeed completed.
 * 4. Dongle DMA's all indices after producing items in the D2H ring, flushing
 *    ring contents before the indices.
 *
 * Host does not sync for DMA to complete with option #3 or #4, and a noop sync
 * callback (see dhd_prot_d2h_sync_none) may be bound.
 *
 * Dongle advertizes host side sync mechanism requirements.
 */

#define PCIE_D2H_SYNC_WAIT_TRIES    (512U)
#define PCIE_D2H_SYNC_NUM_OF_STEPS  (5U)
#define PCIE_D2H_SYNC_DELAY         (100UL)     /* in terms of usecs */

/**
 * Custom callback attached based upon D2H DMA Sync mode advertized by dongle.
 *
 * On success: return cmn_msg_hdr_t::msg_type
 * On failure: return 0 (invalid msg_type)
 */
typedef uint8 (* d2h_sync_cb_t)(dhd_pub_t *dhd, struct msgbuf_ring *ring,
                                volatile cmn_msg_hdr_t *msg, int msglen);

/*
 * +----------------------------------------------------------------------------
 *
 * RingIds and FlowId are not equivalent as ringids include D2H rings whereas
 * flowids do not.
 *
 * Dongle advertizes the max H2D rings, as max_sub_queues = 'N' which includes
 * the H2D common rings as well as the (N-BCMPCIE_H2D_COMMON_MSGRINGS) flowrings
 *
 * Here is a sample mapping for (based on PCIE Full Dongle Rev5) where,
 *  BCMPCIE_H2D_COMMON_MSGRINGS = 2, i.e. 2 H2D common rings,
 *  BCMPCIE_COMMON_MSGRINGS     = 5, i.e. include 3 D2H common rings.
 *
 *  H2D Control  Submit   RingId = 0        FlowId = 0 reserved never allocated
 *  H2D RxPost   Submit   RingId = 1        FlowId = 1 reserved never allocated
 *
 *  D2H Control  Complete RingId = 2
 *  D2H Transmit Complete RingId = 3
 *  D2H Receive  Complete RingId = 4
 *
 *  H2D TxPost   FLOWRING RingId = 5         FlowId = 2     (1st flowring)
 *  H2D TxPost   FLOWRING RingId = 6         FlowId = 3     (2nd flowring)
 *  H2D TxPost   FLOWRING RingId = 5 + (N-1) FlowId = (N-1) (Nth flowring)
 *
 * When TxPost FlowId(s) are allocated, the FlowIds [0..FLOWID_RESERVED) are
 * unused, where FLOWID_RESERVED is BCMPCIE_H2D_COMMON_MSGRINGS.
 *
 * Example: when a system supports 4 bc/mc and 128 uc flowrings, with
 * BCMPCIE_H2D_COMMON_MSGRINGS = 2, and BCMPCIE_H2D_COMMON_MSGRINGS = 5, and the
 * FlowId values would be in the range [2..133] and the corresponding
 * RingId values would be in the range [5..136].
 *
 * The flowId allocator, may chose to, allocate Flowids:
 *   bc/mc (per virtual interface) in one consecutive range [2..(2+VIFS))
 *   X# of uc flowids in consecutive ranges (per station Id), where X is the
 *   packet's access category (e.g. 4 uc flowids per station).
 *
 * CAUTION:
 * When DMA indices array feature is used, RingId=5, corresponding to the 0th
 * FLOWRING, will actually use the FlowId as index into the H2D DMA index,
 * since the FlowId truly represents the index in the H2D DMA indices array.
 *
 * Likewise, in the D2H direction, the RingId - BCMPCIE_H2D_COMMON_MSGRINGS,
 * will represent the index in the D2H DMA indices array.
 *
 * +----------------------------------------------------------------------------
 */

/* First TxPost Flowring Id */
#define DHD_FLOWRING_START_FLOWID   BCMPCIE_H2D_COMMON_MSGRINGS

/* Determine whether a ringid belongs to a TxPost flowring */
#define DHD_IS_FLOWRING(ringid, max_flow_rings) \
        ((ringid) >= BCMPCIE_COMMON_MSGRINGS && \
        (ringid) < ((max_flow_rings) + BCMPCIE_COMMON_MSGRINGS))

/* Convert a H2D TxPost FlowId to a MsgBuf RingId */
#define DHD_FLOWID_TO_RINGID(flowid) \
        (BCMPCIE_COMMON_MSGRINGS + ((flowid) - BCMPCIE_H2D_COMMON_MSGRINGS))

/* Convert a MsgBuf RingId to a H2D TxPost FlowId */
#define DHD_RINGID_TO_FLOWID(ringid) \
        (BCMPCIE_H2D_COMMON_MSGRINGS + ((ringid) - BCMPCIE_COMMON_MSGRINGS))

/* Convert a H2D MsgBuf RingId to an offset index into the H2D DMA indices array
 * This may be used for the H2D DMA WR index array or H2D DMA RD index array or
 * any array of H2D rings.
 */
#define DHD_H2D_RING_OFFSET(ringid) \
        (((ringid) >= BCMPCIE_COMMON_MSGRINGS) ? DHD_RINGID_TO_FLOWID(ringid) : (ringid))

/* Convert a H2D MsgBuf Flowring Id to an offset index into the H2D DMA indices array
 * This may be used for IFRM.
 */
#define DHD_H2D_FRM_FLOW_RING_OFFSET(ringid) \
        ((ringid) - BCMPCIE_COMMON_MSGRINGS)

/* Convert a D2H MsgBuf RingId to an offset index into the D2H DMA indices array
 * This may be used for the D2H DMA WR index array or D2H DMA RD index array or
 * any array of D2H rings.
 * d2h debug ring is located at the end, i.e. after all the tx flow rings and h2d debug ring
 * max_h2d_rings: total number of h2d rings
 */
#define DHD_D2H_RING_OFFSET(ringid, max_h2d_rings) \
        ((ringid) > (max_h2d_rings) ? \
                ((ringid) - max_h2d_rings) : \
                ((ringid) - BCMPCIE_H2D_COMMON_MSGRINGS))

/* Convert a D2H DMA Indices Offset to a RingId */
#define DHD_D2H_RINGID(offset) \
        ((offset) + BCMPCIE_H2D_COMMON_MSGRINGS)

#define DHD_DMAH_NULL      ((void*)NULL)

/*
 * Pad a DMA-able buffer by an additional cachline. If the end of the DMA-able
 * buffer does not occupy the entire cacheline, and another object is placed
 * following the DMA-able buffer, data corruption may occur if the DMA-able
 * buffer is used to DMAing into (e.g. D2H direction), when HW cache coherency
 * is not available.
 */
#if defined(L1_CACHE_BYTES)
#define DHD_DMA_PAD        (L1_CACHE_BYTES)
#else
#define DHD_DMA_PAD        (128)
#endif // endif

/* Used in loopback tests */
typedef struct dhd_dmaxfer {
        dhd_dma_buf_t srcmem;
        dhd_dma_buf_t dstmem;
        uint32        srcdelay;
        uint32        destdelay;
        uint32        len;
        bool          in_progress;
        uint64        start_usec;
        uint32        d11_lpbk;
        int           status;
} dhd_dmaxfer_t;

/**
 * msgbuf_ring : This object manages the host side ring that includes a DMA-able
 * buffer, the WR and RD indices, ring parameters such as max number of items
 * an length of each items, and other miscellaneous runtime state.
 * A msgbuf_ring may be used to represent a H2D or D2H common ring or a
 * H2D TxPost ring as specified in the PCIE FullDongle Spec.
 * Ring parameters are conveyed to the dongle, which maintains its own peer end
 * ring state. Depending on whether the DMA Indices feature is supported, the
 * host will update the WR/RD index in the DMA indices array in host memory or
 * directly in dongle memory.
 */
typedef struct msgbuf_ring {
        bool           inited;
        uint16         idx;       /* ring id */
        uint16         rd;        /* read index */
        uint16         curr_rd;   /* read index for debug */
        uint16         wr;        /* write index */
        uint16         max_items; /* maximum number of items in ring */
        uint16         item_len;  /* length of each item in the ring */
        sh_addr_t      base_addr; /* LITTLE ENDIAN formatted: base address */
        dhd_dma_buf_t  dma_buf;   /* DMA-able buffer: pa, va, len, dmah, secdma */
        uint32         seqnum;    /* next expected item's sequence number */
#ifdef TXP_FLUSH_NITEMS
        void           *start_addr;
        /* # of messages on ring not yet announced to dongle */
        uint16         pend_items_count;
#endif /* TXP_FLUSH_NITEMS */

        uint8   ring_type;
        uint8   n_completion_ids;
        bool    create_pending;
        uint16  create_req_id;
        uint8   current_phase;
        uint16  compeltion_ring_ids[MAX_COMPLETION_RING_IDS_ASSOCIATED];
        uchar           name[RING_NAME_MAX_LENGTH];
        uint32          ring_mem_allocated;
        void    *ring_lock;
} msgbuf_ring_t;

#define DHD_RING_BGN_VA(ring)           ((ring)->dma_buf.va)
#define DHD_RING_END_VA(ring) \
        ((uint8 *)(DHD_RING_BGN_VA((ring))) + \
         (((ring)->max_items - 1) * (ring)->item_len))

/* This can be overwritten by module parameter defined in dhd_linux.c
 * or by dhd iovar h2d_max_txpost.
 */
int h2d_max_txpost = H2DRING_TXPOST_MAX_ITEM;

/** DHD protocol handle. Is an opaque type to other DHD software layers. */
typedef struct dhd_prot {
        osl_t *osh;             /* OSL handle */
        uint16 rxbufpost_sz;
        uint16 rxbufpost;
        uint16 max_rxbufpost;
        uint16 max_eventbufpost;
        uint16 max_ioctlrespbufpost;
        uint16 max_tsbufpost;
        uint16 max_infobufpost;
        uint16 infobufpost;
        uint16 cur_event_bufs_posted;
        uint16 cur_ioctlresp_bufs_posted;
        uint16 cur_ts_bufs_posted;

        /* Flow control mechanism based on active transmits pending */
        osl_atomic_t active_tx_count; /* increments/decrements on every packet tx/tx_status */
        uint16 h2d_max_txpost;
        uint16 txp_threshold;  /* optimization to write "n" tx items at a time to ring */

        /* MsgBuf Ring info: has a dhd_dma_buf that is dynamically allocated */
        msgbuf_ring_t h2dring_ctrl_subn; /* H2D ctrl message submission ring */
        msgbuf_ring_t h2dring_rxp_subn; /* H2D RxBuf post ring */
        msgbuf_ring_t d2hring_ctrl_cpln; /* D2H ctrl completion ring */
        msgbuf_ring_t d2hring_tx_cpln; /* D2H Tx complete message ring */
        msgbuf_ring_t d2hring_rx_cpln; /* D2H Rx complete message ring */
        msgbuf_ring_t *h2dring_info_subn; /* H2D info submission ring */
        msgbuf_ring_t *d2hring_info_cpln; /* D2H info completion ring */

        msgbuf_ring_t *h2d_flowrings_pool; /* Pool of preallocated flowings */
        dhd_dma_buf_t flowrings_dma_buf; /* Contiguous DMA buffer for flowrings */
        uint16        h2d_rings_total; /* total H2D (common rings + flowrings) */

        uint32          rx_dataoffset;

        dhd_mb_ring_t   mb_ring_fn;     /* called when dongle needs to be notified of new msg */
        dhd_mb_ring_2_t mb_2_ring_fn;   /* called when dongle needs to be notified of new msg */

        /* ioctl related resources */
        uint8 ioctl_state;
        int16 ioctl_status;             /* status returned from dongle */
        uint16 ioctl_resplen;
        dhd_ioctl_recieved_status_t ioctl_received;
        uint curr_ioctl_cmd;
        dhd_dma_buf_t   retbuf;         /* For holding ioctl response */
        dhd_dma_buf_t   ioctbuf;        /* For holding ioctl request */

        dhd_dma_buf_t   d2h_dma_scratch_buf;    /* For holding d2h scratch */

        /* DMA-able arrays for holding WR and RD indices */
        uint32          rw_index_sz; /* Size of a RD or WR index in dongle */
        dhd_dma_buf_t   h2d_dma_indx_wr_buf;    /* Array of H2D WR indices */
        dhd_dma_buf_t   h2d_dma_indx_rd_buf;    /* Array of H2D RD indices */
        dhd_dma_buf_t   d2h_dma_indx_wr_buf;    /* Array of D2H WR indices */
        dhd_dma_buf_t   d2h_dma_indx_rd_buf;    /* Array of D2H RD indices */
        dhd_dma_buf_t h2d_ifrm_indx_wr_buf;     /* Array of H2D WR indices for ifrm */

        dhd_dma_buf_t   host_bus_throughput_buf; /* bus throughput measure buffer */

        dhd_dma_buf_t   *flowring_buf;    /* pool of flow ring buf */
        uint32                  flowring_num;

        d2h_sync_cb_t d2h_sync_cb; /* Sync on D2H DMA done: SEQNUM or XORCSUM */
        ulong d2h_sync_wait_max; /* max number of wait loops to receive one msg */
        ulong d2h_sync_wait_tot; /* total wait loops */

        dhd_dmaxfer_t   dmaxfer; /* for test/DMA loopback */

        uint16          ioctl_seq_no;
        uint16          data_seq_no;
        uint16          ioctl_trans_id;
        void            *pktid_ctrl_map; /* a pktid maps to a packet and its metadata */
        void            *pktid_rx_map;  /* pktid map for rx path */
        void            *pktid_tx_map;  /* pktid map for tx path */
        bool            metadata_dbg;
        void            *pktid_map_handle_ioctl;
#ifdef DHD_MAP_PKTID_LOGGING
        void            *pktid_dma_map; /* pktid map for DMA MAP */
        void            *pktid_dma_unmap; /* pktid map for DMA UNMAP */
#endif /* DHD_MAP_PKTID_LOGGING */

        uint64          ioctl_fillup_time;      /* timestamp for ioctl fillup */
        uint64          ioctl_ack_time;         /* timestamp for ioctl ack */
        uint64          ioctl_cmplt_time;       /* timestamp for ioctl completion */

        /* Applications/utilities can read tx and rx metadata using IOVARs */
        uint16          rx_metadata_offset;
        uint16          tx_metadata_offset;

#if defined(DHD_D2H_SOFT_DOORBELL_SUPPORT)
        /* Host's soft doorbell configuration */
        bcmpcie_soft_doorbell_t soft_doorbell[BCMPCIE_D2H_COMMON_MSGRINGS];
#endif /* DHD_D2H_SOFT_DOORBELL_SUPPORT */

        /* Work Queues to be used by the producer and the consumer, and threshold
         * when the WRITE index must be synced to consumer's workq
         */
#if defined(DHD_LB_TXC)
        uint32 tx_compl_prod_sync ____cacheline_aligned;
        bcm_workq_t tx_compl_prod, tx_compl_cons;
#endif /* DHD_LB_TXC */
#if defined(DHD_LB_RXC)
        uint32 rx_compl_prod_sync ____cacheline_aligned;
        bcm_workq_t rx_compl_prod, rx_compl_cons;
#endif /* DHD_LB_RXC */

        dhd_dma_buf_t   fw_trap_buf; /* firmware trap buffer */

        uint32  host_ipc_version; /* Host sypported IPC rev */
        uint32  device_ipc_version; /* FW supported IPC rev */
        uint32  active_ipc_version; /* Host advertised IPC rev */
        dhd_dma_buf_t   hostts_req_buf; /* For holding host timestamp request buf */
        bool    hostts_req_buf_inuse;
        bool    rx_ts_log_enabled;
        bool    tx_ts_log_enabled;
        bool no_retry;
        bool no_aggr;
        bool fixed_rate;
} dhd_prot_t;

#ifdef DHD_DUMP_PCIE_RINGS
static
int dhd_ring_write(dhd_pub_t *dhd, msgbuf_ring_t *ring, void *file, unsigned long *file_posn);
#endif /* DHD_DUMP_PCIE_RINGS */

extern bool dhd_timesync_delay_post_bufs(dhd_pub_t *dhdp);
extern void dhd_schedule_dmaxfer_free(dhd_pub_t* dhdp, dmaxref_mem_map_t *dmmap);
/* Convert a dmaaddr_t to a base_addr with htol operations */
static INLINE void dhd_base_addr_htolpa(sh_addr_t *base_addr, dmaaddr_t pa);

/* APIs for managing a DMA-able buffer */
static int  dhd_dma_buf_audit(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf);
static int  dhd_dma_buf_alloc(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf, uint32 buf_len);
static void dhd_dma_buf_reset(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf);
static void dhd_dma_buf_free(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf);

/* msgbuf ring management */
static int dhd_prot_ring_attach(dhd_pub_t *dhd, msgbuf_ring_t *ring,
        const char *name, uint16 max_items, uint16 len_item, uint16 ringid);
static void dhd_prot_ring_init(dhd_pub_t *dhd, msgbuf_ring_t *ring);
static void dhd_prot_ring_reset(dhd_pub_t *dhd, msgbuf_ring_t *ring);
static void dhd_prot_ring_detach(dhd_pub_t *dhd, msgbuf_ring_t *ring);
static void dhd_prot_process_fw_timestamp(dhd_pub_t *dhd, void* buf);

/* Pool of pre-allocated msgbuf_ring_t with DMA-able buffers for Flowrings */
static int  dhd_prot_flowrings_pool_attach(dhd_pub_t *dhd);
static void dhd_prot_flowrings_pool_reset(dhd_pub_t *dhd);
static void dhd_prot_flowrings_pool_detach(dhd_pub_t *dhd);

/* Fetch and Release a flowring msgbuf_ring from flowring  pool */
static msgbuf_ring_t *dhd_prot_flowrings_pool_fetch(dhd_pub_t *dhd,
        uint16 flowid);
/* see also dhd_prot_flowrings_pool_release() in dhd_prot.h */

/* Producer: Allocate space in a msgbuf ring */
static void* dhd_prot_alloc_ring_space(dhd_pub_t *dhd, msgbuf_ring_t *ring,
        uint16 nitems, uint16 *alloced, bool exactly_nitems);
static void* dhd_prot_get_ring_space(msgbuf_ring_t *ring, uint16 nitems,
        uint16 *alloced, bool exactly_nitems);

/* Consumer: Determine the location where the next message may be consumed */
static uint8* dhd_prot_get_read_addr(dhd_pub_t *dhd, msgbuf_ring_t *ring,
        uint32 *available_len);

/* Producer (WR index update) or Consumer (RD index update) indication */
static void dhd_prot_ring_write_complete(dhd_pub_t *dhd, msgbuf_ring_t *ring,
        void *p, uint16 len);
static void dhd_prot_upd_read_idx(dhd_pub_t *dhd, msgbuf_ring_t *ring);

static INLINE int dhd_prot_dma_indx_alloc(dhd_pub_t *dhd, uint8 type,
        dhd_dma_buf_t *dma_buf, uint32 bufsz);

/* Set/Get a RD or WR index in the array of indices */
/* See also: dhd_prot_dma_indx_init() */
void dhd_prot_dma_indx_set(dhd_pub_t *dhd, uint16 new_index, uint8 type,
        uint16 ringid);
static uint16 dhd_prot_dma_indx_get(dhd_pub_t *dhd, uint8 type, uint16 ringid);

/* Locate a packet given a pktid */
static INLINE void *dhd_prot_packet_get(dhd_pub_t *dhd, uint32 pktid, uint8 pkttype,
        bool free_pktid);
/* Locate a packet given a PktId and free it. */
static INLINE void dhd_prot_packet_free(dhd_pub_t *dhd, void *pkt, uint8 pkttype, bool send);

static int dhd_msgbuf_query_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd,
        void *buf, uint len, uint8 action);
static int dhd_msgbuf_set_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd,
        void *buf, uint len, uint8 action);
static int dhd_msgbuf_wait_ioctl_cmplt(dhd_pub_t *dhd, uint32 len, void *buf);
static int dhd_fillup_ioct_reqst(dhd_pub_t *dhd, uint16 len, uint cmd,
        void *buf, int ifidx);

/* Post buffers for Rx, control ioctl response and events */
static uint16 dhd_msgbuf_rxbuf_post_ctrlpath(dhd_pub_t *dhd, uint8 msgid, uint32 max_to_post);
static void dhd_msgbuf_rxbuf_post_ioctlresp_bufs(dhd_pub_t *pub);
static void dhd_msgbuf_rxbuf_post_event_bufs(dhd_pub_t *pub);
static void dhd_msgbuf_rxbuf_post(dhd_pub_t *dhd, bool use_rsv_pktid);
static int dhd_prot_rxbuf_post(dhd_pub_t *dhd, uint16 count, bool use_rsv_pktid);
static int dhd_msgbuf_rxbuf_post_ts_bufs(dhd_pub_t *pub);

static void dhd_prot_return_rxbuf(dhd_pub_t *dhd, uint32 pktid, uint32 rxcnt);

/* D2H Message handling */
static int dhd_prot_process_msgtype(dhd_pub_t *dhd, msgbuf_ring_t *ring, uint8 *buf, uint32 len);

/* D2H Message handlers */
static void dhd_prot_noop(dhd_pub_t *dhd, void *msg);
static void dhd_prot_txstatus_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_ioctcmplt_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_ioctack_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_ringstatus_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_genstatus_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_event_process(dhd_pub_t *dhd, void *msg);

/* Loopback test with dongle */
static void dmaxfer_free_dmaaddr(dhd_pub_t *dhd, dhd_dmaxfer_t *dma);
static int dmaxfer_prepare_dmaaddr(dhd_pub_t *dhd, uint len, uint srcdelay,
        uint destdelay, dhd_dmaxfer_t *dma);
static void dhd_msgbuf_dmaxfer_process(dhd_pub_t *dhd, void *msg);

/* Flowring management communication with dongle */
static void dhd_prot_flow_ring_create_response_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_flow_ring_delete_response_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_flow_ring_flush_response_process(dhd_pub_t *dhd, void *msg);
static void dhd_prot_process_flow_ring_resume_response(dhd_pub_t *dhd, void* msg);
static void dhd_prot_process_flow_ring_suspend_response(dhd_pub_t *dhd, void* msg);

/* Monitor Mode */
#ifdef WL_MONITOR
extern bool dhd_monitor_enabled(dhd_pub_t *dhd, int ifidx);
extern void dhd_rx_mon_pkt(dhd_pub_t *dhdp, host_rxbuf_cmpl_t* msg, void *pkt, int ifidx);
#endif /* WL_MONITOR */

/* Configure a soft doorbell per D2H ring */
static void dhd_msgbuf_ring_config_d2h_soft_doorbell(dhd_pub_t *dhd);
static void dhd_prot_process_d2h_ring_config_complete(dhd_pub_t *dhd, void *msg);
static void dhd_prot_process_d2h_ring_create_complete(dhd_pub_t *dhd, void *buf);
static void dhd_prot_process_h2d_ring_create_complete(dhd_pub_t *dhd, void *buf);
static void dhd_prot_process_infobuf_complete(dhd_pub_t *dhd, void* buf);
static void dhd_prot_process_d2h_mb_data(dhd_pub_t *dhd, void* buf);
static void dhd_prot_detach_info_rings(dhd_pub_t *dhd);
static void dhd_prot_process_d2h_host_ts_complete(dhd_pub_t *dhd, void* buf);
static void dhd_prot_process_snapshot_complete(dhd_pub_t *dhd, void *buf);

typedef void (*dhd_msgbuf_func_t)(dhd_pub_t *dhd, void *msg);

/** callback functions for messages generated by the dongle */
#define MSG_TYPE_INVALID 0

static dhd_msgbuf_func_t table_lookup[DHD_PROT_FUNCS] = {
        dhd_prot_noop, /* 0 is MSG_TYPE_INVALID */
        dhd_prot_genstatus_process, /* MSG_TYPE_GEN_STATUS */
        dhd_prot_ringstatus_process, /* MSG_TYPE_RING_STATUS */
        NULL,
        dhd_prot_flow_ring_create_response_process, /* MSG_TYPE_FLOW_RING_CREATE_CMPLT */
        NULL,
        dhd_prot_flow_ring_delete_response_process, /* MSG_TYPE_FLOW_RING_DELETE_CMPLT */
        NULL,
        dhd_prot_flow_ring_flush_response_process, /* MSG_TYPE_FLOW_RING_FLUSH_CMPLT */
        NULL,
        dhd_prot_ioctack_process, /* MSG_TYPE_IOCTLPTR_REQ_ACK */
        NULL,
        dhd_prot_ioctcmplt_process, /* MSG_TYPE_IOCTL_CMPLT */
        NULL,
        dhd_prot_event_process, /* MSG_TYPE_WL_EVENT */
        NULL,
        dhd_prot_txstatus_process, /* MSG_TYPE_TX_STATUS */
        NULL,
        NULL,   /* MSG_TYPE_RX_CMPLT use dedicated handler */
        NULL,
        dhd_msgbuf_dmaxfer_process, /* MSG_TYPE_LPBK_DMAXFER_CMPLT */
        NULL, /* MSG_TYPE_FLOW_RING_RESUME */
        dhd_prot_process_flow_ring_resume_response, /* MSG_TYPE_FLOW_RING_RESUME_CMPLT */
        NULL, /* MSG_TYPE_FLOW_RING_SUSPEND */
        dhd_prot_process_flow_ring_suspend_response, /* MSG_TYPE_FLOW_RING_SUSPEND_CMPLT */
        NULL, /* MSG_TYPE_INFO_BUF_POST */
        dhd_prot_process_infobuf_complete, /* MSG_TYPE_INFO_BUF_CMPLT */
        NULL, /* MSG_TYPE_H2D_RING_CREATE */
        NULL, /* MSG_TYPE_D2H_RING_CREATE */
        dhd_prot_process_h2d_ring_create_complete, /* MSG_TYPE_H2D_RING_CREATE_CMPLT */
        dhd_prot_process_d2h_ring_create_complete, /* MSG_TYPE_D2H_RING_CREATE_CMPLT */
        NULL, /* MSG_TYPE_H2D_RING_CONFIG */
        NULL, /* MSG_TYPE_D2H_RING_CONFIG */
        NULL, /* MSG_TYPE_H2D_RING_CONFIG_CMPLT */
        dhd_prot_process_d2h_ring_config_complete, /* MSG_TYPE_D2H_RING_CONFIG_CMPLT */
        NULL, /* MSG_TYPE_H2D_MAILBOX_DATA */
        dhd_prot_process_d2h_mb_data, /* MSG_TYPE_D2H_MAILBOX_DATA */
        NULL,   /* MSG_TYPE_TIMSTAMP_BUFPOST */
        NULL,   /* MSG_TYPE_HOSTTIMSTAMP */
        dhd_prot_process_d2h_host_ts_complete,  /* MSG_TYPE_HOSTTIMSTAMP_CMPLT */
        dhd_prot_process_fw_timestamp,  /* MSG_TYPE_FIRMWARE_TIMESTAMP */
        NULL,   /* MSG_TYPE_SNAPSHOT_UPLOAD */
        dhd_prot_process_snapshot_complete,     /* MSG_TYPE_SNAPSHOT_CMPLT */
};

#ifdef DHD_RX_CHAINING

#define PKT_CTF_CHAINABLE(dhd, ifidx, evh, prio, h_sa, h_da, h_prio) \
        (dhd_wet_chainable(dhd) && \
        dhd_rx_pkt_chainable((dhd), (ifidx)) && \
        !ETHER_ISNULLDEST(((struct ether_header *)(evh))->ether_dhost) && \
        !ETHER_ISMULTI(((struct ether_header *)(evh))->ether_dhost) && \
        !eacmp((h_da), ((struct ether_header *)(evh))->ether_dhost) && \
        !eacmp((h_sa), ((struct ether_header *)(evh))->ether_shost) && \
        ((h_prio) == (prio)) && (dhd_ctf_hotbrc_check((dhd), (evh), (ifidx))) && \
        ((((struct ether_header *)(evh))->ether_type == HTON16(ETHER_TYPE_IP)) || \
        (((struct ether_header *)(evh))->ether_type == HTON16(ETHER_TYPE_IPV6))))

static INLINE void BCMFASTPATH dhd_rxchain_reset(rxchain_info_t *rxchain);
static void BCMFASTPATH dhd_rxchain_frame(dhd_pub_t *dhd, void *pkt, uint ifidx);
static void BCMFASTPATH dhd_rxchain_commit(dhd_pub_t *dhd);

#define DHD_PKT_CTF_MAX_CHAIN_LEN       64

#endif /* DHD_RX_CHAINING */

#define DHD_LPBKDTDUMP_ON()     (dhd_msg_level & DHD_LPBKDTDUMP_VAL)

static void dhd_prot_h2d_sync_init(dhd_pub_t *dhd);

#ifdef D2H_MINIDUMP
dhd_dma_buf_t *
dhd_prot_get_minidump_buf(dhd_pub_t *dhd)
{
        return &dhd->prot->fw_trap_buf;
}
#endif /* D2H_MINIDUMP */

bool
dhd_prot_is_cmpl_ring_empty(dhd_pub_t *dhd, void *prot_info)
{
        msgbuf_ring_t *flow_ring = (msgbuf_ring_t *)prot_info;
        uint16 rd, wr;
        bool ret;

        if (dhd->dma_d2h_ring_upd_support) {
                wr = flow_ring->wr;
        } else {
                dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, flow_ring->idx);
        }
        if (dhd->dma_h2d_ring_upd_support) {
                rd = flow_ring->rd;
        } else {
                dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, flow_ring->idx);
        }
        ret = (wr == rd) ? TRUE : FALSE;
        return ret;
}

void
dhd_prot_dump_ring_ptrs(void *prot_info)
{
        msgbuf_ring_t *ring = (msgbuf_ring_t *)prot_info;
        DHD_ERROR(("%s curr_rd: %d rd: %d wr: %d \n", __FUNCTION__,
                ring->curr_rd, ring->rd, ring->wr));
}

uint16
dhd_prot_get_h2d_max_txpost(dhd_pub_t *dhd)
{
        return (uint16)h2d_max_txpost;
}
void
dhd_prot_set_h2d_max_txpost(dhd_pub_t *dhd, uint16 max_txpost)
{
        h2d_max_txpost = max_txpost;
}
/**
 * D2H DMA to completion callback handlers. Based on the mode advertised by the
 * dongle through the PCIE shared region, the appropriate callback will be
 * registered in the proto layer to be invoked prior to precessing any message
 * from a D2H DMA ring. If the dongle uses a read barrier or another mode that
 * does not require host participation, then a noop callback handler will be
 * bound that simply returns the msg_type.
 */
static void dhd_prot_d2h_sync_livelock(dhd_pub_t *dhd, uint32 msg_seqnum, msgbuf_ring_t *ring,
                                       uint32 tries, volatile uchar *msg, int msglen);
static uint8 dhd_prot_d2h_sync_seqnum(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                                      volatile cmn_msg_hdr_t *msg, int msglen);
static uint8 dhd_prot_d2h_sync_xorcsum(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                                       volatile cmn_msg_hdr_t *msg, int msglen);
static uint8 dhd_prot_d2h_sync_none(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                                    volatile cmn_msg_hdr_t *msg, int msglen);
static void dhd_prot_d2h_sync_init(dhd_pub_t *dhd);
static int dhd_send_d2h_ringcreate(dhd_pub_t *dhd, msgbuf_ring_t *ring_to_create,
        uint16 ring_type, uint32 id);
static int dhd_send_h2d_ringcreate(dhd_pub_t *dhd, msgbuf_ring_t *ring_to_create,
        uint8 type, uint32 id);
static uint16 dhd_get_max_flow_rings(dhd_pub_t *dhd);

/**
 * dhd_prot_d2h_sync_livelock - when the host determines that a DMA transfer has
 * not completed, a livelock condition occurs. Host will avert this livelock by
 * dropping this message and moving to the next. This dropped message can lead
 * to a packet leak, or even something disastrous in the case the dropped
 * message happens to be a control response.
 * Here we will log this condition. One may choose to reboot the dongle.
 *
 */
static void
dhd_prot_d2h_sync_livelock(dhd_pub_t *dhd, uint32 msg_seqnum, msgbuf_ring_t *ring, uint32 tries,
                           volatile uchar *msg, int msglen)
{
        uint32 ring_seqnum = ring->seqnum;

        DHD_ERROR((
                "LIVELOCK DHD<%p> ring<%s> msg_seqnum<%u> ring_seqnum<%u:%u> tries<%u> max<%lu>"
                " tot<%lu> dma_buf va<%p> msg<%p> curr_rd<%d>\n",
                dhd, ring->name, msg_seqnum, ring_seqnum, ring_seqnum% D2H_EPOCH_MODULO, tries,
                dhd->prot->d2h_sync_wait_max, dhd->prot->d2h_sync_wait_tot,
                ring->dma_buf.va, msg, ring->curr_rd));

        dhd_prhex("D2H MsgBuf Failure", msg, msglen, DHD_ERROR_VAL);

        dhd_bus_dump_console_buffer(dhd->bus);
        dhd_prot_debug_info_print(dhd);

#ifdef DHD_FW_COREDUMP
        if (dhd->memdump_enabled) {
                /* collect core dump */
                dhd->memdump_type = DUMP_TYPE_BY_LIVELOCK;
                dhd_bus_mem_dump(dhd);
        }
#endif /* DHD_FW_COREDUMP */

        dhd_schedule_reset(dhd);

#ifdef SUPPORT_LINKDOWN_RECOVERY
#ifdef CONFIG_ARCH_MSM
        dhd->bus->no_cfg_restore = 1;
#endif /* CONFIG_ARCH_MSM */
        dhd->hang_reason = HANG_REASON_MSGBUF_LIVELOCK;
        dhd_os_send_hang_message(dhd);
#endif /* SUPPORT_LINKDOWN_RECOVERY */
}

/**
 * dhd_prot_d2h_sync_seqnum - Sync on a D2H DMA completion using the SEQNUM
 * mode. Sequence number is always in the last word of a message.
 */
static uint8 BCMFASTPATH
dhd_prot_d2h_sync_seqnum(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                         volatile cmn_msg_hdr_t *msg, int msglen)
{
        uint32 tries;
        uint32 ring_seqnum = ring->seqnum % D2H_EPOCH_MODULO;
        int num_words = msglen / sizeof(uint32); /* num of 32bit words */
        volatile uint32 *marker = (volatile uint32 *)msg + (num_words - 1); /* last word */
        dhd_prot_t *prot = dhd->prot;
        uint32 msg_seqnum;
        uint32 step = 0;
        uint32 delay = PCIE_D2H_SYNC_DELAY;
        uint32 total_tries = 0;

        ASSERT(msglen == ring->item_len);

        BCM_REFERENCE(delay);
        /*
         * For retries we have to make some sort of stepper algorithm.
         * We see that every time when the Dongle comes out of the D3
         * Cold state, the first D2H mem2mem DMA takes more time to
         * complete, leading to livelock issues.
         *
         * Case 1 - Apart from Host CPU some other bus master is
         * accessing the DDR port, probably page close to the ring
         * so, PCIE does not get a change to update the memory.
         * Solution - Increase the number of tries.
         *
         * Case 2 - The 50usec delay given by the Host CPU is not
         * sufficient for the PCIe RC to start its work.
         * In this case the breathing time of 50usec given by
         * the Host CPU is not sufficient.
         * Solution: Increase the delay in a stepper fashion.
         * This is done to ensure that there are no
         * unwanted extra delay introdcued in normal conditions.
         */
        for (step = 1; step <= PCIE_D2H_SYNC_NUM_OF_STEPS; step++) {
                for (tries = 0; tries < PCIE_D2H_SYNC_WAIT_TRIES; tries++) {
                        msg_seqnum = *marker;
                        if (ltoh32(msg_seqnum) == ring_seqnum) { /* dma upto last word done */
                                ring->seqnum++; /* next expected sequence number */
                                goto dma_completed;
                        }

                        total_tries = (uint32)(((step-1) * PCIE_D2H_SYNC_WAIT_TRIES) + tries);

                        if (total_tries > prot->d2h_sync_wait_max)
                                prot->d2h_sync_wait_max = total_tries;

                        OSL_CACHE_INV(msg, msglen); /* invalidate and try again */
                        OSL_CPU_RELAX(); /* CPU relax for msg_seqnum  value to update */
                        OSL_DELAY(delay * step); /* Add stepper delay */

                } /* for PCIE_D2H_SYNC_WAIT_TRIES */
        } /* for PCIE_D2H_SYNC_NUM_OF_STEPS */

        dhd_prot_d2h_sync_livelock(dhd, msg_seqnum, ring, total_tries,
                (volatile uchar *) msg, msglen);

        ring->seqnum++; /* skip this message ... leak of a pktid */
        return MSG_TYPE_INVALID; /* invalid msg_type 0 -> noop callback */

dma_completed:

        prot->d2h_sync_wait_tot += tries;
        return msg->msg_type;
}

/**
 * dhd_prot_d2h_sync_xorcsum - Sync on a D2H DMA completion using the XORCSUM
 * mode. The xorcsum is placed in the last word of a message. Dongle will also
 * place a seqnum in the epoch field of the cmn_msg_hdr.
 */
static uint8 BCMFASTPATH
dhd_prot_d2h_sync_xorcsum(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                          volatile cmn_msg_hdr_t *msg, int msglen)
{
        uint32 tries;
        uint32 prot_checksum = 0; /* computed checksum */
        int num_words = msglen / sizeof(uint32); /* num of 32bit words */
        uint8 ring_seqnum = ring->seqnum % D2H_EPOCH_MODULO;
        dhd_prot_t *prot = dhd->prot;
        uint32 step = 0;
        uint32 delay = PCIE_D2H_SYNC_DELAY;
        uint32 total_tries = 0;

        ASSERT(msglen == ring->item_len);

        BCM_REFERENCE(delay);
        /*
         * For retries we have to make some sort of stepper algorithm.
         * We see that every time when the Dongle comes out of the D3
         * Cold state, the first D2H mem2mem DMA takes more time to
         * complete, leading to livelock issues.
         *
         * Case 1 - Apart from Host CPU some other bus master is
         * accessing the DDR port, probably page close to the ring
         * so, PCIE does not get a change to update the memory.
         * Solution - Increase the number of tries.
         *
         * Case 2 - The 50usec delay given by the Host CPU is not
         * sufficient for the PCIe RC to start its work.
         * In this case the breathing time of 50usec given by
         * the Host CPU is not sufficient.
         * Solution: Increase the delay in a stepper fashion.
         * This is done to ensure that there are no
         * unwanted extra delay introdcued in normal conditions.
         */
        for (step = 1; step <= PCIE_D2H_SYNC_NUM_OF_STEPS; step++) {
                for (tries = 0; tries < PCIE_D2H_SYNC_WAIT_TRIES; tries++) {
                        /* First verify if the seqnumber has been update,
                         * if yes, then only check xorcsum.
                         * Once seqnum and xorcsum is proper that means
                         * complete message has arrived.
                         */
                        if (msg->epoch == ring_seqnum) {
                                prot_checksum = bcm_compute_xor32((volatile uint32 *)msg,
                                        num_words);
                                if (prot_checksum == 0U) { /* checksum is OK */
                                        ring->seqnum++; /* next expected sequence number */
                                        goto dma_completed;
                                }
                        }

                        total_tries = ((step-1) * PCIE_D2H_SYNC_WAIT_TRIES) + tries;

                        if (total_tries > prot->d2h_sync_wait_max)
                                prot->d2h_sync_wait_max = total_tries;

                        OSL_CACHE_INV(msg, msglen); /* invalidate and try again */
                        OSL_CPU_RELAX(); /* CPU relax for msg_seqnum  value to update */
                        OSL_DELAY(delay * step); /* Add stepper delay */

                } /* for PCIE_D2H_SYNC_WAIT_TRIES */
        } /* for PCIE_D2H_SYNC_NUM_OF_STEPS */

        DHD_ERROR(("%s: prot_checksum = 0x%x\n", __FUNCTION__, prot_checksum));
        dhd_prot_d2h_sync_livelock(dhd, msg->epoch, ring, total_tries,
                (volatile uchar *) msg, msglen);

        ring->seqnum++; /* skip this message ... leak of a pktid */
        return MSG_TYPE_INVALID; /* invalid msg_type 0 -> noop callback */

dma_completed:

        prot->d2h_sync_wait_tot += tries;
        return msg->msg_type;
}

/**
 * dhd_prot_d2h_sync_none - Dongle ensure that the DMA will complete and host
 * need to try to sync. This noop sync handler will be bound when the dongle
 * advertises that neither the SEQNUM nor XORCSUM mode of DMA sync is required.
 */
static uint8 BCMFASTPATH
dhd_prot_d2h_sync_none(dhd_pub_t *dhd, msgbuf_ring_t *ring,
                       volatile cmn_msg_hdr_t *msg, int msglen)
{
        return msg->msg_type;
}

INLINE void
dhd_wakeup_ioctl_event(dhd_pub_t *dhd, dhd_ioctl_recieved_status_t reason)
{
        /* To synchronize with the previous memory operations call wmb() */
        OSL_SMP_WMB();
        dhd->prot->ioctl_received = reason;
        /* Call another wmb() to make sure before waking up the other event value gets updated */
        OSL_SMP_WMB();
        dhd_os_ioctl_resp_wake(dhd);
}

/**
 * dhd_prot_d2h_sync_init - Setup the host side DMA sync mode based on what
 * dongle advertizes.
 */
static void
dhd_prot_d2h_sync_init(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        prot->d2h_sync_wait_max = 0UL;
        prot->d2h_sync_wait_tot = 0UL;

        prot->d2hring_ctrl_cpln.seqnum = D2H_EPOCH_INIT_VAL;
        prot->d2hring_ctrl_cpln.current_phase = BCMPCIE_CMNHDR_PHASE_BIT_INIT;

        prot->d2hring_tx_cpln.seqnum = D2H_EPOCH_INIT_VAL;
        prot->d2hring_tx_cpln.current_phase = BCMPCIE_CMNHDR_PHASE_BIT_INIT;

        prot->d2hring_rx_cpln.seqnum = D2H_EPOCH_INIT_VAL;
        prot->d2hring_rx_cpln.current_phase = BCMPCIE_CMNHDR_PHASE_BIT_INIT;

        if (dhd->d2h_sync_mode & PCIE_SHARED_D2H_SYNC_SEQNUM) {
                prot->d2h_sync_cb = dhd_prot_d2h_sync_seqnum;
                DHD_ERROR(("%s(): D2H sync mechanism is SEQNUM \r\n", __FUNCTION__));
        } else if (dhd->d2h_sync_mode & PCIE_SHARED_D2H_SYNC_XORCSUM) {
                prot->d2h_sync_cb = dhd_prot_d2h_sync_xorcsum;
                DHD_ERROR(("%s(): D2H sync mechanism is XORCSUM \r\n", __FUNCTION__));
        } else {
                prot->d2h_sync_cb = dhd_prot_d2h_sync_none;
                DHD_ERROR(("%s(): D2H sync mechanism is NONE \r\n", __FUNCTION__));
        }
}

/**
 * dhd_prot_h2d_sync_init - Per H2D common ring, setup the msgbuf ring seqnum
 */
static void
dhd_prot_h2d_sync_init(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        prot->h2dring_rxp_subn.seqnum = H2D_EPOCH_INIT_VAL;
        prot->h2dring_rxp_subn.current_phase = 0;

        prot->h2dring_ctrl_subn.seqnum = H2D_EPOCH_INIT_VAL;
        prot->h2dring_ctrl_subn.current_phase = 0;
}

/* +-----------------  End of PCIE DHD H2D DMA SYNC ------------------------+ */

/*
 * +---------------------------------------------------------------------------+
 * PCIE DMA-able buffer. Sets up a dhd_dma_buf_t object, which includes the
 * virtual and physical address, the buffer lenght and the DMA handler.
 * A secdma handler is also included in the dhd_dma_buf object.
 * +---------------------------------------------------------------------------+
 */

static INLINE void
dhd_base_addr_htolpa(sh_addr_t *base_addr, dmaaddr_t pa)
{
        base_addr->low_addr = htol32(PHYSADDRLO(pa));
        base_addr->high_addr = htol32(PHYSADDRHI(pa));
}

/**
 * dhd_dma_buf_audit - Any audits on a DHD DMA Buffer.
 */
static int
dhd_dma_buf_audit(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf)
{
        uint32 pa_lowaddr, end; /* dongle uses 32bit ptr arithmetic */
        ASSERT(dma_buf);
        pa_lowaddr = PHYSADDRLO(dma_buf->pa);
        ASSERT(PHYSADDRLO(dma_buf->pa) || PHYSADDRHI(dma_buf->pa));
        ASSERT(ISALIGNED(pa_lowaddr, DMA_ALIGN_LEN));
        ASSERT(dma_buf->len != 0);

        /* test 32bit offset arithmetic over dma buffer for loss of carry-over */
        end = (pa_lowaddr + dma_buf->len); /* end address */

        if ((end & 0xFFFFFFFF) < (pa_lowaddr & 0xFFFFFFFF)) { /* exclude carryover */
                DHD_ERROR(("%s: dma_buf %x len %d spans dongle 32bit ptr arithmetic\n",
                        __FUNCTION__, pa_lowaddr, dma_buf->len));
                return BCME_ERROR;
        }

        return BCME_OK;
}

/**
 * dhd_dma_buf_alloc - Allocate a cache coherent DMA-able buffer.
 * returns BCME_OK=0 on success
 * returns non-zero negative error value on failure.
 */
static int
dhd_dma_buf_alloc(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf, uint32 buf_len)
{
        uint32 dma_pad = 0;
        osl_t *osh = dhd->osh;
        uint16 dma_align = DMA_ALIGN_LEN;

        ASSERT(dma_buf != NULL);
        ASSERT(dma_buf->va == NULL);
        ASSERT(dma_buf->len == 0);

        /* Pad the buffer length by one extra cacheline size.
         * Required for D2H direction.
         */
        dma_pad = (buf_len % DHD_DMA_PAD) ? DHD_DMA_PAD : 0;
        dma_buf->va = DMA_ALLOC_CONSISTENT(osh, buf_len + dma_pad,
                dma_align, &dma_buf->_alloced, &dma_buf->pa, &dma_buf->dmah);

        if (dma_buf->va == NULL) {
                DHD_ERROR(("%s: buf_len %d, no memory available\n",
                        __FUNCTION__, buf_len));
                return BCME_NOMEM;
        }

        dma_buf->len = buf_len; /* not including padded len */

        if (dhd_dma_buf_audit(dhd, dma_buf) != BCME_OK) { /* audit dma buf */
                dhd_dma_buf_free(dhd, dma_buf);
                return BCME_ERROR;
        }

        dhd_dma_buf_reset(dhd, dma_buf); /* zero out and cache flush */

        return BCME_OK;
}

/**
 * dhd_dma_buf_reset - Reset a cache coherent DMA-able buffer.
 */
static void
dhd_dma_buf_reset(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf)
{
        if ((dma_buf == NULL) || (dma_buf->va == NULL))
                return;

        (void)dhd_dma_buf_audit(dhd, dma_buf);

        /* Zero out the entire buffer and cache flush */
        memset((void*)dma_buf->va, 0, dma_buf->len);
        OSL_CACHE_FLUSH((void *)dma_buf->va, dma_buf->len);
}

/**
 * dhd_dma_buf_free - Free a DMA-able buffer that was previously allocated using
 * dhd_dma_buf_alloc().
 */
static void
dhd_dma_buf_free(dhd_pub_t *dhd, dhd_dma_buf_t *dma_buf)
{
        osl_t *osh = dhd->osh;

        ASSERT(dma_buf);

        if (dma_buf->va == NULL)
                return; /* Allow for free invocation, when alloc failed */

        /* DEBUG: dhd_dma_buf_reset(dhd, dma_buf) */
        (void)dhd_dma_buf_audit(dhd, dma_buf);

        /* dma buffer may have been padded at allocation */
        DMA_FREE_CONSISTENT(osh, dma_buf->va, dma_buf->_alloced,
                dma_buf->pa, dma_buf->dmah);

        memset(dma_buf, 0, sizeof(dhd_dma_buf_t));
}

/**
 * dhd_dma_buf_init - Initialize a dhd_dma_buf with speicifed values.
 * Do not use dhd_dma_buf_init to zero out a dhd_dma_buf_t object. Use memset 0.
 */
void
dhd_dma_buf_init(dhd_pub_t *dhd, void *dhd_dma_buf,
        void *va, uint32 len, dmaaddr_t pa, void *dmah, void *secdma)
{
        dhd_dma_buf_t *dma_buf;
        ASSERT(dhd_dma_buf);
        dma_buf = (dhd_dma_buf_t *)dhd_dma_buf;
        dma_buf->va = va;
        dma_buf->len = len;
        dma_buf->pa = pa;
        dma_buf->dmah = dmah;
        dma_buf->secdma = secdma;

        /* Audit user defined configuration */
        (void)dhd_dma_buf_audit(dhd, dma_buf);
}

/* +------------------  End of PCIE DHD DMA BUF ADT ------------------------+ */

/*
 * +---------------------------------------------------------------------------+
 * DHD_MAP_PKTID_LOGGING
 * Logging the PKTID and DMA map/unmap information for the SMMU fault issue
 * debugging in customer platform.
 * +---------------------------------------------------------------------------+
 */

#ifdef DHD_MAP_PKTID_LOGGING
typedef struct dhd_pktid_log_item {
        dmaaddr_t pa;           /* DMA bus address */
        uint64 ts_nsec;         /* Timestamp: nsec */
        uint32 size;            /* DMA map/unmap size */
        uint32 pktid;           /* Packet ID */
        uint8 pkttype;          /* Packet Type */
        uint8 rsvd[7];          /* Reserved for future use */
} dhd_pktid_log_item_t;

typedef struct dhd_pktid_log {
        uint32 items;           /* number of total items */
        uint32 index;           /* index of pktid_log_item */
        dhd_pktid_log_item_t map[0];    /* metadata storage */
} dhd_pktid_log_t;

typedef void * dhd_pktid_log_handle_t; /* opaque handle to pktid log */

#define MAX_PKTID_LOG                           (2048)
#define DHD_PKTID_LOG_ITEM_SZ                   (sizeof(dhd_pktid_log_item_t))
#define DHD_PKTID_LOG_SZ(items)                 (uint32)((sizeof(dhd_pktid_log_t)) + \
                                        ((DHD_PKTID_LOG_ITEM_SZ) * (items)))

#define DHD_PKTID_LOG_INIT(dhd, hdl)            dhd_pktid_logging_init((dhd), (hdl))
#define DHD_PKTID_LOG_FINI(dhd, hdl)            dhd_pktid_logging_fini((dhd), (hdl))
#define DHD_PKTID_LOG(dhd, hdl, pa, pktid, len, pkttype)        \
        dhd_pktid_logging((dhd), (hdl), (pa), (pktid), (len), (pkttype))
#define DHD_PKTID_LOG_DUMP(dhd)                 dhd_pktid_logging_dump((dhd))

static dhd_pktid_log_handle_t *
dhd_pktid_logging_init(dhd_pub_t *dhd, uint32 num_items)
{
        dhd_pktid_log_t *log;
        uint32 log_size;

        log_size = DHD_PKTID_LOG_SZ(num_items);
        log = (dhd_pktid_log_t *)MALLOCZ(dhd->osh, log_size);
        if (log == NULL) {
                DHD_ERROR(("%s: MALLOC failed for size %d\n",
                        __FUNCTION__, log_size));
                return (dhd_pktid_log_handle_t *)NULL;
        }

        log->items = num_items;
        log->index = 0;

        return (dhd_pktid_log_handle_t *)log; /* opaque handle */
}

static void
dhd_pktid_logging_fini(dhd_pub_t *dhd, dhd_pktid_log_handle_t *handle)
{
        dhd_pktid_log_t *log;
        uint32 log_size;

        if (handle == NULL) {
                DHD_ERROR(("%s: handle is NULL\n", __FUNCTION__));
                return;
        }

        log = (dhd_pktid_log_t *)handle;
        log_size = DHD_PKTID_LOG_SZ(log->items);
        MFREE(dhd->osh, handle, log_size);
}

static void
dhd_pktid_logging(dhd_pub_t *dhd, dhd_pktid_log_handle_t *handle, dmaaddr_t pa,
        uint32 pktid, uint32 len, uint8 pkttype)
{
        dhd_pktid_log_t *log;
        uint32 idx;

        if (handle == NULL) {
                DHD_ERROR(("%s: handle is NULL\n", __FUNCTION__));
                return;
        }

        log = (dhd_pktid_log_t *)handle;
        idx = log->index;
        log->map[idx].ts_nsec = OSL_LOCALTIME_NS();
        log->map[idx].pa = pa;
        log->map[idx].pktid = pktid;
        log->map[idx].size = len;
        log->map[idx].pkttype = pkttype;
        log->index = (idx + 1) % (log->items);  /* update index */
}

void
dhd_pktid_logging_dump(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        dhd_pktid_log_t *map_log, *unmap_log;
        uint64 ts_sec, ts_usec;

        if (prot == NULL) {
                DHD_ERROR(("%s: prot is NULL\n", __FUNCTION__));
                return;
        }

        map_log = (dhd_pktid_log_t *)(prot->pktid_dma_map);
        unmap_log = (dhd_pktid_log_t *)(prot->pktid_dma_unmap);
        OSL_GET_LOCALTIME(&ts_sec, &ts_usec);
        if (map_log && unmap_log) {
                DHD_ERROR(("%s: map_idx=%d unmap_idx=%d "
                        "current time=[%5lu.%06lu]\n", __FUNCTION__,
                        map_log->index, unmap_log->index,
                        (unsigned long)ts_sec, (unsigned long)ts_usec));
                DHD_ERROR(("%s: pktid_map_log(pa)=0x%llx size=%d, "
                        "pktid_unmap_log(pa)=0x%llx size=%d\n", __FUNCTION__,
                        (uint64)__virt_to_phys((ulong)(map_log->map)),
                        (uint32)(DHD_PKTID_LOG_ITEM_SZ * map_log->items),
                        (uint64)__virt_to_phys((ulong)(unmap_log->map)),
                        (uint32)(DHD_PKTID_LOG_ITEM_SZ * unmap_log->items)));
        }
}
#endif /* DHD_MAP_PKTID_LOGGING */

/* +-----------------  End of DHD_MAP_PKTID_LOGGING -----------------------+ */

/*
 * +---------------------------------------------------------------------------+
 * PktId Map: Provides a native packet pointer to unique 32bit PktId mapping.
 * Main purpose is to save memory on the dongle, has other purposes as well.
 * The packet id map, also includes storage for some packet parameters that
 * may be saved. A native packet pointer along with the parameters may be saved
 * and a unique 32bit pkt id will be returned. Later, the saved packet pointer
 * and the metadata may be retrieved using the previously allocated packet id.
 * +---------------------------------------------------------------------------+
 */
#define DHD_PCIE_PKTID
#define MAX_CTRL_PKTID          (1024) /* Maximum number of pktids supported */
#define MAX_RX_PKTID            (1024)
#define MAX_TX_PKTID            (3072 * 2)

/* On Router, the pktptr serves as a pktid. */

#if defined(PROP_TXSTATUS) && !defined(DHD_PCIE_PKTID)
#error "PKTIDMAP must be supported with PROP_TXSTATUS/WLFC"
#endif // endif

/* Enum for marking the buffer color based on usage */
typedef enum dhd_pkttype {
        PKTTYPE_DATA_TX = 0,
        PKTTYPE_DATA_RX,
        PKTTYPE_IOCTL_RX,
        PKTTYPE_EVENT_RX,
        PKTTYPE_INFO_RX,
        /* dhd_prot_pkt_free no check, if pktid reserved and no space avail case */
        PKTTYPE_NO_CHECK,
        PKTTYPE_TSBUF_RX
} dhd_pkttype_t;

#define DHD_PKTID_INVALID                       (0U)
#define DHD_IOCTL_REQ_PKTID                     (0xFFFE)
#define DHD_FAKE_PKTID                          (0xFACE)
#define DHD_H2D_DBGRING_REQ_PKTID               0xFFFD
#define DHD_D2H_DBGRING_REQ_PKTID               0xFFFC
#define DHD_H2D_HOSTTS_REQ_PKTID                0xFFFB
#define DHD_H2D_BTLOGRING_REQ_PKTID             0xFFFA
#define DHD_D2H_BTLOGRING_REQ_PKTID             0xFFF9
#define DHD_H2D_SNAPSHOT_UPLOAD_REQ_PKTID       0xFFF8

#define IS_FLOWRING(ring) \
        ((strncmp(ring->name, "h2dflr", sizeof("h2dflr"))) == (0))

typedef void * dhd_pktid_map_handle_t; /* opaque handle to a pktid map */

/* Construct a packet id mapping table, returning an opaque map handle */
static dhd_pktid_map_handle_t *dhd_pktid_map_init(dhd_pub_t *dhd, uint32 num_items);

/* Destroy a packet id mapping table, freeing all packets active in the table */
static void dhd_pktid_map_fini(dhd_pub_t *dhd, dhd_pktid_map_handle_t *map);

#define DHD_NATIVE_TO_PKTID_INIT(dhd, items) dhd_pktid_map_init((dhd), (items))
#define DHD_NATIVE_TO_PKTID_RESET(dhd, map)  dhd_pktid_map_reset((dhd), (map))
#define DHD_NATIVE_TO_PKTID_FINI(dhd, map)   dhd_pktid_map_fini((dhd), (map))
#define DHD_NATIVE_TO_PKTID_FINI_IOCTL(osh, map)  dhd_pktid_map_fini_ioctl((osh), (map))

#ifdef MACOSX_DHD
#undef DHD_PCIE_PKTID
#define DHD_PCIE_PKTID 1
#endif /* MACOSX_DHD */

#if defined(DHD_PCIE_PKTID)
#if defined(MACOSX_DHD)
#define IOCTLRESP_USE_CONSTMEM
static void free_ioctl_return_buffer(dhd_pub_t *dhd, dhd_dma_buf_t *retbuf);
static int  alloc_ioctl_return_buffer(dhd_pub_t *dhd, dhd_dma_buf_t *retbuf);
#endif // endif

/* Determine number of pktids that are available */
static INLINE uint32 dhd_pktid_map_avail_cnt(dhd_pktid_map_handle_t *handle);

/* Allocate a unique pktid against which a pkt and some metadata is saved */
static INLINE uint32 dhd_pktid_map_reserve(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle,
        void *pkt, dhd_pkttype_t pkttype);
static INLINE void dhd_pktid_map_save(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle,
        void *pkt, uint32 nkey, dmaaddr_t pa, uint32 len, uint8 dma,
        void *dmah, void *secdma, dhd_pkttype_t pkttype);
static uint32 dhd_pktid_map_alloc(dhd_pub_t *dhd, dhd_pktid_map_handle_t *map,
        void *pkt, dmaaddr_t pa, uint32 len, uint8 dma,
        void *dmah, void *secdma, dhd_pkttype_t pkttype);

/* Return an allocated pktid, retrieving previously saved pkt and metadata */
static void *dhd_pktid_map_free(dhd_pub_t *dhd, dhd_pktid_map_handle_t *map,
        uint32 id, dmaaddr_t *pa, uint32 *len, void **dmah,
        void **secdma, dhd_pkttype_t pkttype, bool rsv_locker);

/*
 * DHD_PKTID_AUDIT_ENABLED: Audit of PktIds in DHD for duplicate alloc and frees
 *
 * DHD_PKTID_AUDIT_MAP: Audit the LIFO or FIFO PktIdMap allocator
 * DHD_PKTID_AUDIT_RING: Audit the pktid during producer/consumer ring operation
 *
 * CAUTION: When DHD_PKTID_AUDIT_ENABLED is defined,
 *    either DHD_PKTID_AUDIT_MAP or DHD_PKTID_AUDIT_RING may be selected.
 */
#if defined(DHD_PKTID_AUDIT_ENABLED)
#define USE_DHD_PKTID_AUDIT_LOCK 1
/* Audit the pktidmap allocator */
/* #define DHD_PKTID_AUDIT_MAP */

/* Audit the pktid during production/consumption of workitems */
#define DHD_PKTID_AUDIT_RING

#if defined(DHD_PKTID_AUDIT_MAP) && defined(DHD_PKTID_AUDIT_RING)
#error "May only enabled audit of MAP or RING, at a time."
#endif /* DHD_PKTID_AUDIT_MAP && DHD_PKTID_AUDIT_RING */

#define DHD_DUPLICATE_ALLOC     1
#define DHD_DUPLICATE_FREE      2
#define DHD_TEST_IS_ALLOC       3
#define DHD_TEST_IS_FREE        4

typedef enum dhd_pktid_map_type {
        DHD_PKTID_MAP_TYPE_CTRL = 1,
        DHD_PKTID_MAP_TYPE_TX,
        DHD_PKTID_MAP_TYPE_RX,
        DHD_PKTID_MAP_TYPE_UNKNOWN
} dhd_pktid_map_type_t;

#ifdef USE_DHD_PKTID_AUDIT_LOCK
#define DHD_PKTID_AUDIT_LOCK_INIT(osh)          dhd_os_spin_lock_init(osh)
#define DHD_PKTID_AUDIT_LOCK_DEINIT(osh, lock)  dhd_os_spin_lock_deinit(osh, lock)
#define DHD_PKTID_AUDIT_LOCK(lock)              dhd_os_spin_lock(lock)
#define DHD_PKTID_AUDIT_UNLOCK(lock, flags)     dhd_os_spin_unlock(lock, flags)
#else
#define DHD_PKTID_AUDIT_LOCK_INIT(osh)          (void *)(1)
#define DHD_PKTID_AUDIT_LOCK_DEINIT(osh, lock)  do { /* noop */ } while (0)
#define DHD_PKTID_AUDIT_LOCK(lock)              0
#define DHD_PKTID_AUDIT_UNLOCK(lock, flags)     do { /* noop */ } while (0)
#endif /* !USE_DHD_PKTID_AUDIT_LOCK */

#endif /* DHD_PKTID_AUDIT_ENABLED */

#define USE_DHD_PKTID_LOCK   1

#ifdef USE_DHD_PKTID_LOCK
#define DHD_PKTID_LOCK_INIT(osh)                dhd_os_spin_lock_init(osh)
#define DHD_PKTID_LOCK_DEINIT(osh, lock)        dhd_os_spin_lock_deinit(osh, lock)
#define DHD_PKTID_LOCK(lock, flags)             (flags) = dhd_os_spin_lock(lock)
#define DHD_PKTID_UNLOCK(lock, flags)           dhd_os_spin_unlock(lock, flags)
#else
#define DHD_PKTID_LOCK_INIT(osh)                (void *)(1)
#define DHD_PKTID_LOCK_DEINIT(osh, lock)        \
        do { \
                BCM_REFERENCE(osh); \
                BCM_REFERENCE(lock); \
        } while (0)
#define DHD_PKTID_LOCK(lock)                    0
#define DHD_PKTID_UNLOCK(lock, flags)           \
        do { \
                BCM_REFERENCE(lock); \
                BCM_REFERENCE(flags); \
        } while (0)
#endif /* !USE_DHD_PKTID_LOCK */

typedef enum dhd_locker_state {
        LOCKER_IS_FREE,
        LOCKER_IS_BUSY,
        LOCKER_IS_RSVD
} dhd_locker_state_t;

/* Packet metadata saved in packet id mapper */

typedef struct dhd_pktid_item {
        dhd_locker_state_t state;  /* tag a locker to be free, busy or reserved */
        uint8       dir;      /* dma map direction (Tx=flush or Rx=invalidate) */
        dhd_pkttype_t pkttype; /* pktlists are maintained based on pkttype */
        uint16      len;      /* length of mapped packet's buffer */
        void        *pkt;     /* opaque native pointer to a packet */
        dmaaddr_t   pa;       /* physical address of mapped packet's buffer */
        void        *dmah;    /* handle to OS specific DMA map */
        void            *secdma;
} dhd_pktid_item_t;

typedef uint32 dhd_pktid_key_t;

typedef struct dhd_pktid_map {
        uint32      items;    /* total items in map */
        uint32      avail;    /* total available items */
        int         failures; /* lockers unavailable count */
        /* Spinlock to protect dhd_pktid_map in process/tasklet context */
        void        *pktid_lock; /* Used when USE_DHD_PKTID_LOCK is defined */

#if defined(DHD_PKTID_AUDIT_ENABLED)
        void            *pktid_audit_lock;
        struct bcm_mwbmap *pktid_audit; /* multi word bitmap based audit */
#endif /* DHD_PKTID_AUDIT_ENABLED */
        dhd_pktid_key_t *keys; /* map_items +1 unique pkt ids */
        dhd_pktid_item_t lockers[0];           /* metadata storage */
} dhd_pktid_map_t;

/*
 * PktId (Locker) #0 is never allocated and is considered invalid.
 *
 * On request for a pktid, a value DHD_PKTID_INVALID must be treated as a
 * depleted pktid pool and must not be used by the caller.
 *
 * Likewise, a caller must never free a pktid of value DHD_PKTID_INVALID.
 */

#define DHD_PKTID_FREE_LOCKER           (FALSE)
#define DHD_PKTID_RSV_LOCKER            (TRUE)

#define DHD_PKTID_ITEM_SZ               (sizeof(dhd_pktid_item_t))
#define DHD_PKIDMAP_ITEMS(items)        (items)
#define DHD_PKTID_MAP_SZ(items)         (sizeof(dhd_pktid_map_t) + \
                                             (DHD_PKTID_ITEM_SZ * ((items) + 1)))
#define DHD_PKTIDMAP_KEYS_SZ(items)     (sizeof(dhd_pktid_key_t) * ((items) + 1))

#define DHD_NATIVE_TO_PKTID_RESET_IOCTL(dhd, map)  dhd_pktid_map_reset_ioctl((dhd), (map))

/* Convert a packet to a pktid, and save pkt pointer in busy locker */
#define DHD_NATIVE_TO_PKTID_RSV(dhd, map, pkt, pkttype)    \
        dhd_pktid_map_reserve((dhd), (map), (pkt), (pkttype))
/* Reuse a previously reserved locker to save packet params */
#define DHD_NATIVE_TO_PKTID_SAVE(dhd, map, pkt, nkey, pa, len, dir, dmah, secdma, pkttype) \
        dhd_pktid_map_save((dhd), (map), (void *)(pkt), (nkey), (pa), (uint32)(len), \
                (uint8)(dir), (void *)(dmah), (void *)(secdma), \
                (dhd_pkttype_t)(pkttype))
/* Convert a packet to a pktid, and save packet params in locker */
#define DHD_NATIVE_TO_PKTID(dhd, map, pkt, pa, len, dir, dmah, secdma, pkttype) \
        dhd_pktid_map_alloc((dhd), (map), (void *)(pkt), (pa), (uint32)(len), \
                (uint8)(dir), (void *)(dmah), (void *)(secdma), \
                (dhd_pkttype_t)(pkttype))

/* Convert pktid to a packet, and free the locker */
#define DHD_PKTID_TO_NATIVE(dhd, map, pktid, pa, len, dmah, secdma, pkttype) \
        dhd_pktid_map_free((dhd), (map), (uint32)(pktid), \
                (dmaaddr_t *)&(pa), (uint32 *)&(len), (void **)&(dmah), \
                (void **)&(secdma), (dhd_pkttype_t)(pkttype), DHD_PKTID_FREE_LOCKER)

/* Convert the pktid to a packet, empty locker, but keep it reserved */
#define DHD_PKTID_TO_NATIVE_RSV(dhd, map, pktid, pa, len, dmah, secdma, pkttype) \
        dhd_pktid_map_free((dhd), (map), (uint32)(pktid), \
                           (dmaaddr_t *)&(pa), (uint32 *)&(len), (void **)&(dmah), \
                           (void **)&(secdma), (dhd_pkttype_t)(pkttype), DHD_PKTID_RSV_LOCKER)

#define DHD_PKTID_AVAIL(map)                 dhd_pktid_map_avail_cnt(map)

#if defined(DHD_PKTID_AUDIT_ENABLED)

static int
dhd_get_pktid_map_type(dhd_pub_t *dhd, dhd_pktid_map_t *pktid_map)
{
        dhd_prot_t *prot = dhd->prot;
        int pktid_map_type;

        if (pktid_map == prot->pktid_ctrl_map) {
                pktid_map_type = DHD_PKTID_MAP_TYPE_CTRL;
        } else if (pktid_map == prot->pktid_tx_map) {
                pktid_map_type = DHD_PKTID_MAP_TYPE_TX;
        } else if (pktid_map == prot->pktid_rx_map) {
                pktid_map_type = DHD_PKTID_MAP_TYPE_RX;
        } else {
                pktid_map_type = DHD_PKTID_MAP_TYPE_UNKNOWN;
        }

        return pktid_map_type;
}

/**
* __dhd_pktid_audit - Use the mwbmap to audit validity of a pktid.
*/
static int
__dhd_pktid_audit(dhd_pub_t *dhd, dhd_pktid_map_t *pktid_map, uint32 pktid,
        const int test_for, const char *errmsg)
{
#define DHD_PKT_AUDIT_STR "ERROR: %16s Host PktId Audit: "
        struct bcm_mwbmap *handle;
        uint32  flags;
        bool ignore_audit;
        int error = BCME_OK;

        if (pktid_map == (dhd_pktid_map_t *)NULL) {
                DHD_ERROR((DHD_PKT_AUDIT_STR "Pkt id map NULL\n", errmsg));
                return BCME_OK;
        }

        flags = DHD_PKTID_AUDIT_LOCK(pktid_map->pktid_audit_lock);

        handle = pktid_map->pktid_audit;
        if (handle == (struct bcm_mwbmap *)NULL) {
                DHD_ERROR((DHD_PKT_AUDIT_STR "Handle NULL\n", errmsg));
                goto out;
        }

        /* Exclude special pktids from audit */
        ignore_audit = (pktid == DHD_IOCTL_REQ_PKTID) | (pktid == DHD_FAKE_PKTID);
        if (ignore_audit) {
                goto out;
        }

        if ((pktid == DHD_PKTID_INVALID) || (pktid > pktid_map->items)) {
                DHD_ERROR((DHD_PKT_AUDIT_STR "PktId<%d> invalid\n", errmsg, pktid));
                error = BCME_ERROR;
                goto out;
        }

        /* Perform audit */
        switch (test_for) {
                case DHD_DUPLICATE_ALLOC:
                        if (!bcm_mwbmap_isfree(handle, pktid)) {
                                DHD_ERROR((DHD_PKT_AUDIT_STR "PktId<%d> alloc duplicate\n",
                                           errmsg, pktid));
                                error = BCME_ERROR;
                        } else {
                                bcm_mwbmap_force(handle, pktid);
                        }
                        break;

                case DHD_DUPLICATE_FREE:
                        if (bcm_mwbmap_isfree(handle, pktid)) {
                                DHD_ERROR((DHD_PKT_AUDIT_STR "PktId<%d> free duplicate\n",
                                           errmsg, pktid));
                                error = BCME_ERROR;
                        } else {
                                bcm_mwbmap_free(handle, pktid);
                        }
                        break;

                case DHD_TEST_IS_ALLOC:
                        if (bcm_mwbmap_isfree(handle, pktid)) {
                                DHD_ERROR((DHD_PKT_AUDIT_STR "PktId<%d> is not allocated\n",
                                           errmsg, pktid));
                                error = BCME_ERROR;
                        }
                        break;

                case DHD_TEST_IS_FREE:
                        if (!bcm_mwbmap_isfree(handle, pktid)) {
                                DHD_ERROR((DHD_PKT_AUDIT_STR "PktId<%d> is not free",
                                           errmsg, pktid));
                                error = BCME_ERROR;
                        }
                        break;

                default:
                        DHD_ERROR(("%s: Invalid test case: %d\n", __FUNCTION__, test_for));
                        error = BCME_ERROR;
                        break;
        }

out:
        DHD_PKTID_AUDIT_UNLOCK(pktid_map->pktid_audit_lock, flags);
        return error;
}

static int
dhd_pktid_audit(dhd_pub_t *dhd, dhd_pktid_map_t *pktid_map, uint32 pktid,
        const int test_for, const char *errmsg)
{
        int ret = BCME_OK;
        ret = __dhd_pktid_audit(dhd, pktid_map, pktid, test_for, errmsg);
        if (ret == BCME_ERROR) {
                DHD_ERROR(("%s: Got Pkt Id Audit failure: PKTID<%d> PKTID MAP TYPE<%d>\n",
                        __FUNCTION__, pktid, dhd_get_pktid_map_type(dhd, pktid_map)));
                dhd_pktid_error_handler(dhd);
        }

        return ret;
}

#define DHD_PKTID_AUDIT(dhdp, map, pktid, test_for) \
        dhd_pktid_audit((dhdp), (dhd_pktid_map_t *)(map), (pktid), (test_for), __FUNCTION__)

static int
dhd_pktid_audit_ring_debug(dhd_pub_t *dhdp, dhd_pktid_map_t *map, uint32 pktid,
        const int test_for, void *msg, uint32 msg_len, const char *func)
{
        int ret = BCME_OK;
        ret = __dhd_pktid_audit(dhdp, map, pktid, test_for, func);
        if (ret == BCME_ERROR) {
                DHD_ERROR(("%s: Got Pkt Id Audit failure: PKTID<%d> PKTID MAP TYPE<%d>\n",
                        __FUNCTION__, pktid, dhd_get_pktid_map_type(dhdp, map)));
                prhex(func, (uchar *)msg, msg_len);
                dhd_pktid_error_handler(dhdp);
        }
        return ret;
}
#define DHD_PKTID_AUDIT_RING_DEBUG(dhdp, map, pktid, test_for, msg, msg_len) \
        dhd_pktid_audit_ring_debug((dhdp), (dhd_pktid_map_t *)(map), \
                (pktid), (test_for), msg, msg_len, __FUNCTION__)

#endif /* DHD_PKTID_AUDIT_ENABLED */

/**
 * +---------------------------------------------------------------------------+
 * Packet to Packet Id mapper using a <numbered_key, locker> paradigm.
 *
 * dhd_pktid_map manages a set of unique Packet Ids range[1..MAX_xxx_PKTID].
 *
 * dhd_pktid_map_alloc() may be used to save some packet metadata, and a unique
 * packet id is returned. This unique packet id may be used to retrieve the
 * previously saved packet metadata, using dhd_pktid_map_free(). On invocation
 * of dhd_pktid_map_free(), the unique packet id is essentially freed. A
 * subsequent call to dhd_pktid_map_alloc() may reuse this packet id.
 *
 * Implementation Note:
 * Convert this into a <key,locker> abstraction and place into bcmutils !
 * Locker abstraction should treat contents as opaque storage, and a
 * callback should be registered to handle busy lockers on destructor.
 *
 * +---------------------------------------------------------------------------+
 */

/** Allocate and initialize a mapper of num_items <numbered_key, locker> */

static dhd_pktid_map_handle_t *
dhd_pktid_map_init(dhd_pub_t *dhd, uint32 num_items)
{
        void* osh;
        uint32 nkey;
        dhd_pktid_map_t *map;
        uint32 dhd_pktid_map_sz;
        uint32 map_items;
        uint32 map_keys_sz;
        osh = dhd->osh;

        dhd_pktid_map_sz = DHD_PKTID_MAP_SZ(num_items);

        map = (dhd_pktid_map_t *)VMALLOC(osh, dhd_pktid_map_sz);
        if (map == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for size %d\n",
                        __FUNCTION__, __LINE__, dhd_pktid_map_sz));
                return (dhd_pktid_map_handle_t *)NULL;
        }

        map->items = num_items;
        map->avail = num_items;

        map_items = DHD_PKIDMAP_ITEMS(map->items);

        map_keys_sz = DHD_PKTIDMAP_KEYS_SZ(map->items);

        /* Initialize the lock that protects this structure */
        map->pktid_lock = DHD_PKTID_LOCK_INIT(osh);
        if (map->pktid_lock == NULL) {
                DHD_ERROR(("%s:%d: Lock init failed \r\n", __FUNCTION__, __LINE__));
                goto error;
        }

        map->keys = (dhd_pktid_key_t *)MALLOC(osh, map_keys_sz);
        if (map->keys == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for map->keys size %d\n",
                        __FUNCTION__, __LINE__, map_keys_sz));
                goto error;
        }

#if defined(DHD_PKTID_AUDIT_ENABLED)
                /* Incarnate a hierarchical multiword bitmap for auditing pktid allocator */
                map->pktid_audit = bcm_mwbmap_init(osh, map_items + 1);
                if (map->pktid_audit == (struct bcm_mwbmap *)NULL) {
                        DHD_ERROR(("%s:%d: pktid_audit init failed\r\n", __FUNCTION__, __LINE__));
                        goto error;
                } else {
                        DHD_ERROR(("%s:%d: pktid_audit init succeeded %d\n",
                                __FUNCTION__, __LINE__, map_items + 1));
                }
                map->pktid_audit_lock = DHD_PKTID_AUDIT_LOCK_INIT(osh);
#endif /* DHD_PKTID_AUDIT_ENABLED */

        for (nkey = 1; nkey <= map_items; nkey++) { /* locker #0 is reserved */
                map->keys[nkey] = nkey; /* populate with unique keys */
                map->lockers[nkey].state = LOCKER_IS_FREE;
                map->lockers[nkey].pkt   = NULL; /* bzero: redundant */
                map->lockers[nkey].len   = 0;
        }

        /* Reserve pktid #0, i.e. DHD_PKTID_INVALID to be inuse */
        map->lockers[DHD_PKTID_INVALID].state = LOCKER_IS_BUSY; /* tag locker #0 as inuse */
        map->lockers[DHD_PKTID_INVALID].pkt   = NULL; /* bzero: redundant */
        map->lockers[DHD_PKTID_INVALID].len   = 0;

#if defined(DHD_PKTID_AUDIT_ENABLED)
        /* do not use dhd_pktid_audit() here, use bcm_mwbmap_force directly */
        bcm_mwbmap_force(map->pktid_audit, DHD_PKTID_INVALID);
#endif /* DHD_PKTID_AUDIT_ENABLED */

        return (dhd_pktid_map_handle_t *)map; /* opaque handle */

error:
        if (map) {
#if defined(DHD_PKTID_AUDIT_ENABLED)
                if (map->pktid_audit != (struct bcm_mwbmap *)NULL) {
                        bcm_mwbmap_fini(osh, map->pktid_audit); /* Destruct pktid_audit */
                        map->pktid_audit = (struct bcm_mwbmap *)NULL;
                        if (map->pktid_audit_lock)
                                DHD_PKTID_AUDIT_LOCK_DEINIT(osh, map->pktid_audit_lock);
                }
#endif /* DHD_PKTID_AUDIT_ENABLED */

                if (map->keys) {
                        MFREE(osh, map->keys, map_keys_sz);
                }

                if (map->pktid_lock) {
                        DHD_PKTID_LOCK_DEINIT(osh, map->pktid_lock);
                }

                VMFREE(osh, map, dhd_pktid_map_sz);
        }
        return (dhd_pktid_map_handle_t *)NULL;
}

/**
 * Retrieve all allocated keys and free all <numbered_key, locker>.
 * Freeing implies: unmapping the buffers and freeing the native packet
 * This could have been a callback registered with the pktid mapper.
 */
static void
dhd_pktid_map_reset(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle)
{
        void *osh;
        uint32 nkey;
        dhd_pktid_map_t *map;
        dhd_pktid_item_t *locker;
        uint32 map_items;
        unsigned long flags;
        bool data_tx = FALSE;

        map = (dhd_pktid_map_t *)handle;
        DHD_PKTID_LOCK(map->pktid_lock, flags);
        osh = dhd->osh;

        map_items = DHD_PKIDMAP_ITEMS(map->items);
        /* skip reserved KEY #0, and start from 1 */

        for (nkey = 1; nkey <= map_items; nkey++) {
                if (map->lockers[nkey].state == LOCKER_IS_BUSY) {
                        locker = &map->lockers[nkey];
                        locker->state = LOCKER_IS_FREE;
                        data_tx = (locker->pkttype == PKTTYPE_DATA_TX);
                        if (data_tx) {
                                OSL_ATOMIC_DEC(dhd->osh, &dhd->prot->active_tx_count);
                        }

#ifdef DHD_PKTID_AUDIT_RING
                        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_DUPLICATE_FREE); /* duplicate frees */
#endif /* DHD_PKTID_AUDIT_RING */
#ifdef DHD_MAP_PKTID_LOGGING
                        DHD_PKTID_LOG(dhd, dhd->prot->pktid_dma_unmap,
                                locker->pa, nkey, locker->len,
                                locker->pkttype);
#endif /* DHD_MAP_PKTID_LOGGING */

                        {
                                if (SECURE_DMA_ENAB(dhd->osh))
                                        SECURE_DMA_UNMAP(osh, locker->pa,
                                                locker->len, locker->dir, 0,
                                                locker->dmah, locker->secdma, 0);
                                else
                                        DMA_UNMAP(osh, locker->pa, locker->len,
                                                locker->dir, 0, locker->dmah);
                        }
                        dhd_prot_packet_free(dhd, (ulong*)locker->pkt,
                                locker->pkttype, data_tx);
                }
                else {
#ifdef DHD_PKTID_AUDIT_RING
                        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_TEST_IS_FREE);
#endif /* DHD_PKTID_AUDIT_RING */
                }
                map->keys[nkey] = nkey; /* populate with unique keys */
        }

        map->avail = map_items;
        memset(&map->lockers[1], 0, sizeof(dhd_pktid_item_t) * map_items);
        DHD_PKTID_UNLOCK(map->pktid_lock, flags);
}

#ifdef IOCTLRESP_USE_CONSTMEM
/** Called in detach scenario. Releasing IOCTL buffers. */
static void
dhd_pktid_map_reset_ioctl(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle)
{
        uint32 nkey;
        dhd_pktid_map_t *map;
        dhd_pktid_item_t *locker;
        uint32 map_items;
        unsigned long flags;

        map = (dhd_pktid_map_t *)handle;
        DHD_PKTID_LOCK(map->pktid_lock, flags);

        map_items = DHD_PKIDMAP_ITEMS(map->items);
        /* skip reserved KEY #0, and start from 1 */
        for (nkey = 1; nkey <= map_items; nkey++) {
                if (map->lockers[nkey].state == LOCKER_IS_BUSY) {
                        dhd_dma_buf_t retbuf;

#ifdef DHD_PKTID_AUDIT_RING
                        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_DUPLICATE_FREE); /* duplicate frees */
#endif /* DHD_PKTID_AUDIT_RING */

                        locker = &map->lockers[nkey];
                        retbuf.va = locker->pkt;
                        retbuf.len = locker->len;
                        retbuf.pa = locker->pa;
                        retbuf.dmah = locker->dmah;
                        retbuf.secdma = locker->secdma;

                        free_ioctl_return_buffer(dhd, &retbuf);
                }
                else {
#ifdef DHD_PKTID_AUDIT_RING
                        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_TEST_IS_FREE);
#endif /* DHD_PKTID_AUDIT_RING */
                }
                map->keys[nkey] = nkey; /* populate with unique keys */
        }

        map->avail = map_items;
        memset(&map->lockers[1], 0, sizeof(dhd_pktid_item_t) * map_items);
        DHD_PKTID_UNLOCK(map->pktid_lock, flags);
}
#endif /* IOCTLRESP_USE_CONSTMEM */

/**
 * Free the pktid map.
 */
static void
dhd_pktid_map_fini(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle)
{
        dhd_pktid_map_t *map;
        uint32 dhd_pktid_map_sz;
        uint32 map_keys_sz;

        if (handle == NULL)
                return;

        /* Free any pending packets */
        dhd_pktid_map_reset(dhd, handle);

        map = (dhd_pktid_map_t *)handle;
        dhd_pktid_map_sz = DHD_PKTID_MAP_SZ(map->items);
        map_keys_sz = DHD_PKTIDMAP_KEYS_SZ(map->items);

        DHD_PKTID_LOCK_DEINIT(dhd->osh, map->pktid_lock);

#if defined(DHD_PKTID_AUDIT_ENABLED)
        if (map->pktid_audit != (struct bcm_mwbmap *)NULL) {
                bcm_mwbmap_fini(dhd->osh, map->pktid_audit); /* Destruct pktid_audit */
                map->pktid_audit = (struct bcm_mwbmap *)NULL;
                if (map->pktid_audit_lock) {
                        DHD_PKTID_AUDIT_LOCK_DEINIT(dhd->osh, map->pktid_audit_lock);
                }
        }
#endif /* DHD_PKTID_AUDIT_ENABLED */
        MFREE(dhd->osh, map->keys, map_keys_sz);
        VMFREE(dhd->osh, handle, dhd_pktid_map_sz);
}
#ifdef IOCTLRESP_USE_CONSTMEM
static void
dhd_pktid_map_fini_ioctl(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle)
{
        dhd_pktid_map_t *map;
        uint32 dhd_pktid_map_sz;
        uint32 map_keys_sz;

        if (handle == NULL)
                return;

        /* Free any pending packets */
        dhd_pktid_map_reset_ioctl(dhd, handle);

        map = (dhd_pktid_map_t *)handle;
        dhd_pktid_map_sz = DHD_PKTID_MAP_SZ(map->items);
        map_keys_sz = DHD_PKTIDMAP_KEYS_SZ(map->items);

        DHD_PKTID_LOCK_DEINIT(dhd->osh, map->pktid_lock);

#if defined(DHD_PKTID_AUDIT_ENABLED)
        if (map->pktid_audit != (struct bcm_mwbmap *)NULL) {
                bcm_mwbmap_fini(dhd->osh, map->pktid_audit); /* Destruct pktid_audit */
                map->pktid_audit = (struct bcm_mwbmap *)NULL;
                if (map->pktid_audit_lock) {
                        DHD_PKTID_AUDIT_LOCK_DEINIT(dhd->osh, map->pktid_audit_lock);
                }
        }
#endif /* DHD_PKTID_AUDIT_ENABLED */

        MFREE(dhd->osh, map->keys, map_keys_sz);
        VMFREE(dhd->osh, handle, dhd_pktid_map_sz);
}
#endif /* IOCTLRESP_USE_CONSTMEM */

/** Get the pktid free count */
static INLINE uint32 BCMFASTPATH
dhd_pktid_map_avail_cnt(dhd_pktid_map_handle_t *handle)
{
        dhd_pktid_map_t *map;
        uint32  avail;
        unsigned long flags;

        ASSERT(handle != NULL);
        map = (dhd_pktid_map_t *)handle;

        DHD_PKTID_LOCK(map->pktid_lock, flags);
        avail = map->avail;
        DHD_PKTID_UNLOCK(map->pktid_lock, flags);

        return avail;
}

/**
 * dhd_pktid_map_reserve - reserve a unique numbered key. Reserved locker is not
 * yet populated. Invoke the pktid save api to populate the packet parameters
 * into the locker. This function is not reentrant, and is the caller's
 * responsibility. Caller must treat a returned value DHD_PKTID_INVALID as
 * a failure case, implying a depleted pool of pktids.
 */
static INLINE uint32
dhd_pktid_map_reserve(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle,
        void *pkt, dhd_pkttype_t pkttype)
{
        uint32 nkey;
        dhd_pktid_map_t *map;
        dhd_pktid_item_t *locker;
        unsigned long flags;

        ASSERT(handle != NULL);
        map = (dhd_pktid_map_t *)handle;

        DHD_PKTID_LOCK(map->pktid_lock, flags);

        if ((int)(map->avail) <= 0) { /* no more pktids to allocate */
                map->failures++;
                DHD_INFO(("%s:%d: failed, no free keys\n", __FUNCTION__, __LINE__));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
                return DHD_PKTID_INVALID; /* failed alloc request */
        }

        ASSERT(map->avail <= map->items);
        nkey = map->keys[map->avail]; /* fetch a free locker, pop stack */

        if ((map->avail > map->items) || (nkey > map->items)) {
                map->failures++;
                DHD_ERROR(("%s:%d: failed to allocate a new pktid,"
                        " map->avail<%u>, nkey<%u>, pkttype<%u>\n",
                        __FUNCTION__, __LINE__, map->avail, nkey,
                        pkttype));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
                return DHD_PKTID_INVALID; /* failed alloc request */
        }

        locker = &map->lockers[nkey]; /* save packet metadata in locker */
        map->avail--;
        locker->pkt = pkt; /* pkt is saved, other params not yet saved. */
        locker->len = 0;
        locker->state = LOCKER_IS_BUSY; /* reserve this locker */

        DHD_PKTID_UNLOCK(map->pktid_lock, flags);

        ASSERT(nkey != DHD_PKTID_INVALID);

        return nkey; /* return locker's numbered key */
}

/*
 * dhd_pktid_map_save - Save a packet's parameters into a locker
 * corresponding to a previously reserved unique numbered key.
 */
static INLINE void
dhd_pktid_map_save(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle, void *pkt,
        uint32 nkey, dmaaddr_t pa, uint32 len, uint8 dir, void *dmah, void *secdma,
        dhd_pkttype_t pkttype)
{
        dhd_pktid_map_t *map;
        dhd_pktid_item_t *locker;
        unsigned long flags;

        ASSERT(handle != NULL);
        map = (dhd_pktid_map_t *)handle;

        DHD_PKTID_LOCK(map->pktid_lock, flags);

        if ((nkey == DHD_PKTID_INVALID) || (nkey > DHD_PKIDMAP_ITEMS(map->items))) {
                DHD_ERROR(("%s:%d: Error! saving invalid pktid<%u> pkttype<%u>\n",
                        __FUNCTION__, __LINE__, nkey, pkttype));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_PKTID_INVALID;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                return;
        }

        locker = &map->lockers[nkey];

        ASSERT(((locker->state == LOCKER_IS_BUSY) && (locker->pkt == pkt)) ||
                ((locker->state == LOCKER_IS_RSVD) && (locker->pkt == NULL)));

        /* store contents in locker */
        locker->dir = dir;
        locker->pa = pa;
        locker->len = (uint16)len; /* 16bit len */
        locker->dmah = dmah; /* 16bit len */
        locker->secdma = secdma;
        locker->pkttype = pkttype;
        locker->pkt = pkt;
        locker->state = LOCKER_IS_BUSY; /* make this locker busy */
#ifdef DHD_MAP_PKTID_LOGGING
        DHD_PKTID_LOG(dhd, dhd->prot->pktid_dma_map, pa, nkey, len, pkttype);
#endif /* DHD_MAP_PKTID_LOGGING */
        DHD_PKTID_UNLOCK(map->pktid_lock, flags);
}

/**
 * dhd_pktid_map_alloc - Allocate a unique numbered key and save the packet
 * contents into the corresponding locker. Return the numbered key.
 */
static uint32 BCMFASTPATH
dhd_pktid_map_alloc(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle, void *pkt,
        dmaaddr_t pa, uint32 len, uint8 dir, void *dmah, void *secdma,
        dhd_pkttype_t pkttype)
{
        uint32 nkey;

        nkey = dhd_pktid_map_reserve(dhd, handle, pkt, pkttype);
        if (nkey != DHD_PKTID_INVALID) {
                dhd_pktid_map_save(dhd, handle, pkt, nkey, pa,
                        len, dir, dmah, secdma, pkttype);
        }

        return nkey;
}

/**
 * dhd_pktid_map_free - Given a numbered key, return the locker contents.
 * dhd_pktid_map_free() is not reentrant, and is the caller's responsibility.
 * Caller may not free a pktid value DHD_PKTID_INVALID or an arbitrary pktid
 * value. Only a previously allocated pktid may be freed.
 */
static void * BCMFASTPATH
dhd_pktid_map_free(dhd_pub_t *dhd, dhd_pktid_map_handle_t *handle, uint32 nkey,
        dmaaddr_t *pa, uint32 *len, void **dmah, void **secdma, dhd_pkttype_t pkttype,
        bool rsv_locker)
{
        dhd_pktid_map_t *map;
        dhd_pktid_item_t *locker;
        void * pkt;
        unsigned long long locker_addr;
        unsigned long flags;

        ASSERT(handle != NULL);

        map = (dhd_pktid_map_t *)handle;

        DHD_PKTID_LOCK(map->pktid_lock, flags);

        if ((nkey == DHD_PKTID_INVALID) || (nkey > DHD_PKIDMAP_ITEMS(map->items))) {
                DHD_ERROR(("%s:%d: Error! Try to free invalid pktid<%u>, pkttype<%d>\n",
                           __FUNCTION__, __LINE__, nkey, pkttype));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_PKTID_INVALID;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                return NULL;
        }

        locker = &map->lockers[nkey];

#if defined(DHD_PKTID_AUDIT_MAP)
        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_DUPLICATE_FREE); /* Audit duplicate FREE */
#endif /* DHD_PKTID_AUDIT_MAP */

        /* Debug check for cloned numbered key */
        if (locker->state == LOCKER_IS_FREE) {
                DHD_ERROR(("%s:%d: Error! freeing already freed invalid pktid<%u>\n",
                           __FUNCTION__, __LINE__, nkey));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_PKTID_INVALID;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                return NULL;
        }

        /* Check for the colour of the buffer i.e The buffer posted for TX,
         * should be freed for TX completion. Similarly the buffer posted for
         * IOCTL should be freed for IOCT completion etc.
         */
        if ((pkttype != PKTTYPE_NO_CHECK) && (locker->pkttype != pkttype)) {

                DHD_ERROR(("%s:%d: Error! Invalid Buffer Free for pktid<%u> \n",
                        __FUNCTION__, __LINE__, nkey));
#ifdef BCMDMA64OSL
                PHYSADDRTOULONG(locker->pa, locker_addr);
#else
                locker_addr = PHYSADDRLO(locker->pa);
#endif /* BCMDMA64OSL */
                DHD_ERROR(("%s:%d: locker->state <%d>, locker->pkttype <%d>,"
                        "pkttype <%d> locker->pa <0x%llx> \n",
                        __FUNCTION__, __LINE__, locker->state, locker->pkttype,
                        pkttype, locker_addr));
                DHD_PKTID_UNLOCK(map->pktid_lock, flags);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_PKTID_INVALID;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                return NULL;
        }

        if (rsv_locker == DHD_PKTID_FREE_LOCKER) {
                map->avail++;
                map->keys[map->avail] = nkey; /* make this numbered key available */
                locker->state = LOCKER_IS_FREE; /* open and free Locker */
        } else {
                /* pktid will be reused, but the locker does not have a valid pkt */
                locker->state = LOCKER_IS_RSVD;
        }

#if defined(DHD_PKTID_AUDIT_MAP)
        DHD_PKTID_AUDIT(dhd, map, nkey, DHD_TEST_IS_FREE);
#endif /* DHD_PKTID_AUDIT_MAP */
#ifdef DHD_MAP_PKTID_LOGGING
        DHD_PKTID_LOG(dhd, dhd->prot->pktid_dma_unmap, locker->pa, nkey,
                (uint32)locker->len, pkttype);
#endif /* DHD_MAP_PKTID_LOGGING */

        *pa = locker->pa; /* return contents of locker */
        *len = (uint32)locker->len;
        *dmah = locker->dmah;
        *secdma = locker->secdma;

        pkt = locker->pkt;
        locker->pkt = NULL; /* Clear pkt */
        locker->len = 0;

        DHD_PKTID_UNLOCK(map->pktid_lock, flags);

        return pkt;
}

#else /* ! DHD_PCIE_PKTID */

typedef struct pktlist {
        PKT_LIST *tx_pkt_list;          /* list for tx packets */
        PKT_LIST *rx_pkt_list;          /* list for rx packets */
        PKT_LIST *ctrl_pkt_list;        /* list for ioctl/event buf post */
} pktlists_t;

/*
 * Given that each workitem only uses a 32bit pktid, only 32bit hosts may avail
 * of a one to one mapping 32bit pktptr and a 32bit pktid.
 *
 * - When PKTIDMAP is not used, DHD_NATIVE_TO_PKTID variants will never fail.
 * - Neither DHD_NATIVE_TO_PKTID nor DHD_PKTID_TO_NATIVE need to be protected by
 *   a lock.
 * - Hence DHD_PKTID_INVALID is not defined when DHD_PCIE_PKTID is undefined.
 */
#define DHD_PKTID32(pktptr32)   ((uint32)(pktptr32))
#define DHD_PKTPTR32(pktid32)   ((void *)(pktid32))

static INLINE uint32 dhd_native_to_pktid(dhd_pktid_map_handle_t *map, void *pktptr32,
        dmaaddr_t pa, uint32 dma_len, void *dmah, void *secdma,
        dhd_pkttype_t pkttype);
static INLINE void * dhd_pktid_to_native(dhd_pktid_map_handle_t *map, uint32 pktid32,
        dmaaddr_t *pa, uint32 *dma_len, void **dmah, void **secdma,
        dhd_pkttype_t pkttype);

static dhd_pktid_map_handle_t *
dhd_pktid_map_init(dhd_pub_t *dhd, uint32 num_items)
{
        osl_t *osh = dhd->osh;
        pktlists_t *handle = NULL;

        if ((handle = (pktlists_t *) MALLOCZ(osh, sizeof(pktlists_t))) == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for lists allocation, size=%d\n",
                           __FUNCTION__, __LINE__, sizeof(pktlists_t)));
                goto error_done;
        }

        if ((handle->tx_pkt_list = (PKT_LIST *) MALLOC(osh, sizeof(PKT_LIST))) == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for list allocation, size=%d\n",
                           __FUNCTION__, __LINE__, sizeof(PKT_LIST)));
                goto error;
        }

        if ((handle->rx_pkt_list = (PKT_LIST *) MALLOC(osh, sizeof(PKT_LIST))) == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for list allocation, size=%d\n",
                           __FUNCTION__, __LINE__, sizeof(PKT_LIST)));
                goto error;
        }

        if ((handle->ctrl_pkt_list = (PKT_LIST *) MALLOC(osh, sizeof(PKT_LIST))) == NULL) {
                DHD_ERROR(("%s:%d: MALLOC failed for list allocation, size=%d\n",
                           __FUNCTION__, __LINE__, sizeof(PKT_LIST)));
                goto error;
        }

        PKTLIST_INIT(handle->tx_pkt_list);
        PKTLIST_INIT(handle->rx_pkt_list);
        PKTLIST_INIT(handle->ctrl_pkt_list);

        return (dhd_pktid_map_handle_t *) handle;

error:
        if (handle->ctrl_pkt_list) {
                MFREE(osh, handle->ctrl_pkt_list, sizeof(PKT_LIST));
        }

        if (handle->rx_pkt_list) {
                MFREE(osh, handle->rx_pkt_list, sizeof(PKT_LIST));
        }

        if (handle->tx_pkt_list) {
                MFREE(osh, handle->tx_pkt_list, sizeof(PKT_LIST));
        }

        if (handle) {
                MFREE(osh, handle, sizeof(pktlists_t));
        }

error_done:
        return (dhd_pktid_map_handle_t *)NULL;
}

static void
dhd_pktid_map_reset(dhd_pub_t *dhd, pktlists_t *handle)
{
        osl_t *osh = dhd->osh;

        if (handle->ctrl_pkt_list) {
                PKTLIST_FINI(handle->ctrl_pkt_list);
                MFREE(osh, handle->ctrl_pkt_list, sizeof(PKT_LIST));
        }

        if (handle->rx_pkt_list) {
                PKTLIST_FINI(handle->rx_pkt_list);
                MFREE(osh, handle->rx_pkt_list, sizeof(PKT_LIST));
        }

        if (handle->tx_pkt_list) {
                PKTLIST_FINI(handle->tx_pkt_list);
                MFREE(osh, handle->tx_pkt_list, sizeof(PKT_LIST));
        }
}

static void
dhd_pktid_map_fini(dhd_pub_t *dhd, dhd_pktid_map_handle_t *map)
{
        osl_t *osh = dhd->osh;
        pktlists_t *handle = (pktlists_t *) map;

        ASSERT(handle != NULL);
        if (handle == (pktlists_t *)NULL) {
                return;
        }

        dhd_pktid_map_reset(dhd, handle);

        if (handle) {
                MFREE(osh, handle, sizeof(pktlists_t));
        }
}

/** Save dma parameters into the packet's pkttag and convert a pktptr to pktid */
static INLINE uint32
dhd_native_to_pktid(dhd_pktid_map_handle_t *map, void *pktptr32,
        dmaaddr_t pa, uint32 dma_len, void *dmah, void *secdma,
        dhd_pkttype_t pkttype)
{
        pktlists_t *handle = (pktlists_t *) map;
        ASSERT(pktptr32 != NULL);
        DHD_PKT_SET_DMA_LEN(pktptr32, dma_len);
        DHD_PKT_SET_DMAH(pktptr32, dmah);
        DHD_PKT_SET_PA(pktptr32, pa);
        DHD_PKT_SET_SECDMA(pktptr32, secdma);

        if (pkttype == PKTTYPE_DATA_TX) {
                PKTLIST_ENQ(handle->tx_pkt_list,  pktptr32);
        } else if (pkttype == PKTTYPE_DATA_RX) {
                PKTLIST_ENQ(handle->rx_pkt_list,  pktptr32);
        } else {
                PKTLIST_ENQ(handle->ctrl_pkt_list,  pktptr32);
        }

        return DHD_PKTID32(pktptr32);
}

/** Convert a pktid to pktptr and retrieve saved dma parameters from packet */
static INLINE void *
dhd_pktid_to_native(dhd_pktid_map_handle_t *map, uint32 pktid32,
        dmaaddr_t *pa, uint32 *dma_len, void **dmah, void **secdma,
        dhd_pkttype_t pkttype)
{
        pktlists_t *handle = (pktlists_t *) map;
        void *pktptr32;

        ASSERT(pktid32 != 0U);
        pktptr32 = DHD_PKTPTR32(pktid32);
        *dma_len = DHD_PKT_GET_DMA_LEN(pktptr32);
        *dmah = DHD_PKT_GET_DMAH(pktptr32);
        *pa = DHD_PKT_GET_PA(pktptr32);
        *secdma = DHD_PKT_GET_SECDMA(pktptr32);

        if (pkttype == PKTTYPE_DATA_TX) {
                PKTLIST_UNLINK(handle->tx_pkt_list,  pktptr32);
        } else if (pkttype == PKTTYPE_DATA_RX) {
                PKTLIST_UNLINK(handle->rx_pkt_list,  pktptr32);
        } else {
                PKTLIST_UNLINK(handle->ctrl_pkt_list,  pktptr32);
        }

        return pktptr32;
}

#define DHD_NATIVE_TO_PKTID_RSV(dhd, map, pkt, pkttype)  DHD_PKTID32(pkt)

#define DHD_NATIVE_TO_PKTID_SAVE(dhd, map, pkt, nkey, pa, len, dma_dir, dmah, secdma, pkttype) \
        ({ BCM_REFERENCE(dhd); BCM_REFERENCE(nkey); BCM_REFERENCE(dma_dir); \
           dhd_native_to_pktid((dhd_pktid_map_handle_t *) map, (pkt), (pa), (len), \
                           (dmah), (secdma), (dhd_pkttype_t)(pkttype)); \
        })

#define DHD_NATIVE_TO_PKTID(dhd, map, pkt, pa, len, dma_dir, dmah, secdma, pkttype) \
        ({ BCM_REFERENCE(dhd); BCM_REFERENCE(dma_dir); \
           dhd_native_to_pktid((dhd_pktid_map_handle_t *) map, (pkt), (pa), (len), \
                           (dmah), (secdma), (dhd_pkttype_t)(pkttype)); \
        })

#define DHD_PKTID_TO_NATIVE(dhd, map, pktid, pa, len, dmah, secdma, pkttype) \
        ({ BCM_REFERENCE(dhd); BCM_REFERENCE(pkttype);  \
                dhd_pktid_to_native((dhd_pktid_map_handle_t *) map, (uint32)(pktid), \
                                (dmaaddr_t *)&(pa), (uint32 *)&(len), (void **)&(dmah), \
                                (void **)&secdma, (dhd_pkttype_t)(pkttype)); \
        })

#define DHD_PKTID_AVAIL(map)  (~0)

#endif /* ! DHD_PCIE_PKTID */

/* +------------------ End of PCIE DHD PKTID MAPPER  -----------------------+ */

/**
 * The PCIE FD protocol layer is constructed in two phases:
 *    Phase 1. dhd_prot_attach()
 *    Phase 2. dhd_prot_init()
 *
 * dhd_prot_attach() - Allocates a dhd_prot_t object and resets all its fields.
 * All Common rings are allose attached (msgbuf_ring_t objects are allocated
 * with DMA-able buffers).
 * All dhd_dma_buf_t objects are also allocated here.
 *
 * As dhd_prot_attach is invoked prior to the pcie_shared object is read, any
 * initialization of objects that requires information advertized by the dongle
 * may not be performed here.
 * E.g. the number of TxPost flowrings is not know at this point, neither do
 * we know shich form of D2H DMA sync mechanism is advertized by the dongle, or
 * whether the dongle supports DMA-ing of WR/RD indices for the H2D and/or D2H
 * rings (common + flow).
 *
 * dhd_prot_init() is invoked after the bus layer has fetched the information
 * advertized by the dongle in the pcie_shared_t.
 */
int
dhd_prot_attach(dhd_pub_t *dhd)
{
        osl_t *osh = dhd->osh;
        dhd_prot_t *prot;

        /* FW going to DMA extended trap data,
         * allocate buffer for the maximum extended trap data.
         */
#ifdef D2H_MINIDUMP
        uint32 trap_buf_len = BCMPCIE_HOST_EXT_TRAP_DBGBUF_LEN_MIN;
#else
        uint32 trap_buf_len = BCMPCIE_EXT_TRAP_DATA_MAXLEN;
#endif /* D2H_MINIDUMP */

        /* Allocate prot structure */
        if (!(prot = (dhd_prot_t *)DHD_OS_PREALLOC(dhd, DHD_PREALLOC_PROT,
                sizeof(dhd_prot_t)))) {
                DHD_ERROR(("%s: kmalloc failed\n", __FUNCTION__));
                goto fail;
        }
        memset(prot, 0, sizeof(*prot));

        prot->osh = osh;
        dhd->prot = prot;

        /* DMAing ring completes supported? FALSE by default  */
        dhd->dma_d2h_ring_upd_support = FALSE;
        dhd->dma_h2d_ring_upd_support = FALSE;
        dhd->dma_ring_upd_overwrite = FALSE;

        dhd->idma_inited = 0;
        dhd->ifrm_inited = 0;
        dhd->dar_inited = 0;

        /* Common Ring Allocations */

        /* Ring  0: H2D Control Submission */
        if (dhd_prot_ring_attach(dhd, &prot->h2dring_ctrl_subn, "h2dctrl",
                H2DRING_CTRL_SUB_MAX_ITEM, H2DRING_CTRL_SUB_ITEMSIZE,
                BCMPCIE_H2D_MSGRING_CONTROL_SUBMIT) != BCME_OK) {
                DHD_ERROR(("%s: dhd_prot_ring_attach H2D Ctrl Submission failed\n",
                        __FUNCTION__));
                goto fail;
        }

        /* Ring  1: H2D Receive Buffer Post */
        if (dhd_prot_ring_attach(dhd, &prot->h2dring_rxp_subn, "h2drxp",
                H2DRING_RXPOST_MAX_ITEM, H2DRING_RXPOST_ITEMSIZE,
                BCMPCIE_H2D_MSGRING_RXPOST_SUBMIT) != BCME_OK) {
                DHD_ERROR(("%s: dhd_prot_ring_attach H2D RxPost failed\n",
                        __FUNCTION__));
                goto fail;
        }

        /* Ring  2: D2H Control Completion */
        if (dhd_prot_ring_attach(dhd, &prot->d2hring_ctrl_cpln, "d2hctrl",
                D2HRING_CTRL_CMPLT_MAX_ITEM, D2HRING_CTRL_CMPLT_ITEMSIZE,
                BCMPCIE_D2H_MSGRING_CONTROL_COMPLETE) != BCME_OK) {
                DHD_ERROR(("%s: dhd_prot_ring_attach D2H Ctrl Completion failed\n",
                        __FUNCTION__));
                goto fail;
        }

        /* Ring  3: D2H Transmit Complete */
        if (dhd_prot_ring_attach(dhd, &prot->d2hring_tx_cpln, "d2htxcpl",
                D2HRING_TXCMPLT_MAX_ITEM, D2HRING_TXCMPLT_ITEMSIZE,
                BCMPCIE_D2H_MSGRING_TX_COMPLETE) != BCME_OK) {
                DHD_ERROR(("%s: dhd_prot_ring_attach D2H Tx Completion failed\n",
                        __FUNCTION__));
                goto fail;

        }

        /* Ring  4: D2H Receive Complete */
        if (dhd_prot_ring_attach(dhd, &prot->d2hring_rx_cpln, "d2hrxcpl",
                D2HRING_RXCMPLT_MAX_ITEM, D2HRING_RXCMPLT_ITEMSIZE,
                BCMPCIE_D2H_MSGRING_RX_COMPLETE) != BCME_OK) {
                DHD_ERROR(("%s: dhd_prot_ring_attach D2H Rx Completion failed\n",
                        __FUNCTION__));
                goto fail;

        }

        /*
         * Max number of flowrings is not yet known. msgbuf_ring_t with DMA-able
         * buffers for flowrings will be instantiated, in dhd_prot_init() .
         * See dhd_prot_flowrings_pool_attach()
         */
        /* ioctl response buffer */
        if (dhd_dma_buf_alloc(dhd, &prot->retbuf, IOCT_RETBUF_SIZE)) {
                goto fail;
        }

        /* IOCTL request buffer */
        if (dhd_dma_buf_alloc(dhd, &prot->ioctbuf, IOCT_RETBUF_SIZE)) {
                goto fail;
        }

        /* Host TS request buffer one buffer for now */
        if (dhd_dma_buf_alloc(dhd, &prot->hostts_req_buf, CTRLSUB_HOSTTS_MEESAGE_SIZE)) {
                goto fail;
        }
        prot->hostts_req_buf_inuse = FALSE;

        /* Scratch buffer for dma rx offset */
#ifdef BCM_HOST_BUF
        if (dhd_dma_buf_alloc(dhd, &prot->d2h_dma_scratch_buf,
                ROUNDUP(DMA_D2H_SCRATCH_BUF_LEN, 16) + DMA_HOST_BUFFER_LEN)) {
#else
        if (dhd_dma_buf_alloc(dhd, &prot->d2h_dma_scratch_buf, DMA_D2H_SCRATCH_BUF_LEN)) {

#endif /* BCM_HOST_BUF */

                goto fail;
        }

        /* scratch buffer bus throughput measurement */
        if (dhd_dma_buf_alloc(dhd, &prot->host_bus_throughput_buf, DHD_BUS_TPUT_BUF_LEN)) {
                goto fail;
        }

#ifdef DHD_RX_CHAINING
        dhd_rxchain_reset(&prot->rxchain);
#endif // endif

        prot->pktid_ctrl_map = DHD_NATIVE_TO_PKTID_INIT(dhd, MAX_CTRL_PKTID);
        if (prot->pktid_ctrl_map == NULL) {
                goto fail;
        }

        prot->pktid_rx_map = DHD_NATIVE_TO_PKTID_INIT(dhd, MAX_RX_PKTID);
        if (prot->pktid_rx_map == NULL)
                goto fail;

        prot->pktid_tx_map = DHD_NATIVE_TO_PKTID_INIT(dhd, MAX_TX_PKTID);
        if (prot->pktid_tx_map == NULL)
                goto fail;

#ifdef IOCTLRESP_USE_CONSTMEM
        prot->pktid_map_handle_ioctl = DHD_NATIVE_TO_PKTID_INIT(dhd,
                DHD_FLOWRING_MAX_IOCTLRESPBUF_POST);
        if (prot->pktid_map_handle_ioctl == NULL) {
                goto fail;
        }
#endif /* IOCTLRESP_USE_CONSTMEM */

#ifdef DHD_MAP_PKTID_LOGGING
        prot->pktid_dma_map = DHD_PKTID_LOG_INIT(dhd, MAX_PKTID_LOG);
        if (prot->pktid_dma_map == NULL) {
                DHD_ERROR(("%s: failed to allocate pktid_dma_map\n",
                        __FUNCTION__));
        }

        prot->pktid_dma_unmap = DHD_PKTID_LOG_INIT(dhd, MAX_PKTID_LOG);
        if (prot->pktid_dma_unmap == NULL) {
                DHD_ERROR(("%s: failed to allocate pktid_dma_unmap\n",
                        __FUNCTION__));
        }
#endif /* DHD_MAP_PKTID_LOGGING */

           /* Initialize the work queues to be used by the Load Balancing logic */
#if defined(DHD_LB_TXC)
        {
                void *buffer;
                buffer = MALLOC(dhd->osh, sizeof(void*) * DHD_LB_WORKQ_SZ);
                if (buffer == NULL) {
                        DHD_ERROR(("%s: failed to allocate RXC work buffer\n", __FUNCTION__));
                        goto fail;
                }
                bcm_workq_init(&prot->tx_compl_prod, &prot->tx_compl_cons,
                        buffer, DHD_LB_WORKQ_SZ);
                prot->tx_compl_prod_sync = 0;
                DHD_INFO(("%s: created tx_compl_workq <%p,%d>\n",
                        __FUNCTION__, buffer, DHD_LB_WORKQ_SZ));
           }
#endif /* DHD_LB_TXC */

#if defined(DHD_LB_RXC)
           {
                void *buffer;
                buffer = MALLOC(dhd->osh, sizeof(void*) * DHD_LB_WORKQ_SZ);
                if (buffer == NULL) {
                        DHD_ERROR(("%s: failed to allocate RXC work buffer\n", __FUNCTION__));
                        goto fail;
                }
                bcm_workq_init(&prot->rx_compl_prod, &prot->rx_compl_cons,
                        buffer, DHD_LB_WORKQ_SZ);
                prot->rx_compl_prod_sync = 0;
                DHD_INFO(("%s: created rx_compl_workq <%p,%d>\n",
                        __FUNCTION__, buffer, DHD_LB_WORKQ_SZ));
           }
#endif /* DHD_LB_RXC */

        /* Initialize trap buffer */
        if (dhd_dma_buf_alloc(dhd, &dhd->prot->fw_trap_buf, trap_buf_len)) {
                DHD_ERROR(("%s: dhd_init_trap_buffer falied\n", __FUNCTION__));
                goto fail;
        }

        return BCME_OK;

fail:

        if (prot) {
                /* Free up all allocated memories */
                dhd_prot_detach(dhd);
        }

        return BCME_NOMEM;
} /* dhd_prot_attach */

void
dhd_set_host_cap(dhd_pub_t *dhd)
{
        uint32 data = 0;
        dhd_prot_t *prot = dhd->prot;
#ifdef D2H_MINIDUMP
        uint16 host_trap_addr_len;
#endif /* D2H_MINIDUMP */

        if (dhd->bus->api.fw_rev >= PCIE_SHARED_VERSION_6) {
                if (dhd->h2d_phase_supported) {
                        data |= HOSTCAP_H2D_VALID_PHASE;
                        if (dhd->force_dongletrap_on_bad_h2d_phase)
                                data |= HOSTCAP_H2D_ENABLE_TRAP_ON_BADPHASE;
                }
                if (prot->host_ipc_version > prot->device_ipc_version)
                        prot->active_ipc_version = prot->device_ipc_version;
                else
                        prot->active_ipc_version = prot->host_ipc_version;

                data |= prot->active_ipc_version;

                if (dhdpcie_bus_get_pcie_hostready_supported(dhd->bus)) {
                        DHD_INFO(("Advertise Hostready Capability\n"));
                        data |= HOSTCAP_H2D_ENABLE_HOSTRDY;
                }
                {
                        /* Disable DS altogether */
                        data |= HOSTCAP_DS_NO_OOB_DW;
                        dhdpcie_bus_enab_pcie_dw(dhd->bus, DEVICE_WAKE_NONE);
                }

                /* Indicate support for extended trap data */
                data |= HOSTCAP_EXTENDED_TRAP_DATA;

                /* Indicate support for TX status metadata */
                if (dhd->pcie_txs_metadata_enable != 0)
                        data |= HOSTCAP_TXSTATUS_METADATA;

                /* Enable fast delete ring in firmware if supported */
                if (dhd->fast_delete_ring_support) {
                        data |= HOSTCAP_FAST_DELETE_RING;
                }

                if (dhdpcie_bus_get_pcie_idma_supported(dhd->bus)) {
                        DHD_ERROR(("IDMA inited\n"));
                        data |= HOSTCAP_H2D_IDMA;
                        dhd->idma_inited = TRUE;
                }

                if (dhdpcie_bus_get_pcie_ifrm_supported(dhd->bus)) {
                        DHD_ERROR(("IFRM Inited\n"));
                        data |= HOSTCAP_H2D_IFRM;
                        dhd->ifrm_inited = TRUE;
                        dhd->dma_h2d_ring_upd_support = FALSE;
                        dhd_prot_dma_indx_free(dhd);
                }

                if (dhdpcie_bus_get_pcie_dar_supported(dhd->bus)) {
                        DHD_ERROR(("DAR doorbell Use\n"));
                        data |= HOSTCAP_H2D_DAR;
                        dhd->dar_inited = TRUE;
                }

                data |= HOSTCAP_UR_FW_NO_TRAP;

#ifdef D2H_MINIDUMP
                if (dhd_bus_is_minidump_enabled(dhd)) {
                        data |= HOSTCAP_EXT_TRAP_DBGBUF;
                        DHD_ERROR(("ALLOW D2H MINIDUMP!!\n"));
                }
#endif /* D2H_MINIDUMP */
                DHD_INFO(("%s:Active Ver:%d, Host Ver:%d, FW Ver:%d\n",
                        __FUNCTION__,
                        prot->active_ipc_version, prot->host_ipc_version,
                        prot->device_ipc_version));

                dhd_bus_cmn_writeshared(dhd->bus, &data, sizeof(uint32), HOST_API_VERSION, 0);
                dhd_bus_cmn_writeshared(dhd->bus, &prot->fw_trap_buf.pa,
                        sizeof(prot->fw_trap_buf.pa), DNGL_TO_HOST_TRAP_ADDR, 0);
#ifdef D2H_MINIDUMP
                if (dhd_bus_is_minidump_enabled(dhd)) {
                        /* Dongle expects the host_trap_addr_len in terms of words */
                        host_trap_addr_len = BCMPCIE_HOST_EXT_TRAP_DBGBUF_LEN_MIN/ 4;
                        dhd_bus_cmn_writeshared(dhd->bus, &host_trap_addr_len,
                                sizeof(host_trap_addr_len), DNGL_TO_HOST_TRAP_ADDR_LEN, 0);
                }
#endif /* D2H_MINIDUMP */

        }

}

/**
 * dhd_prot_init - second stage of dhd_prot_attach. Now that the dongle has
 * completed it's initialization of the pcie_shared structure, we may now fetch
 * the dongle advertized features and adjust the protocol layer accordingly.
 *
 * dhd_prot_init() may be invoked again after a dhd_prot_reset().
 */
int
dhd_prot_init(dhd_pub_t *dhd)
{
        sh_addr_t base_addr;
        dhd_prot_t *prot = dhd->prot;
        int ret = 0;
        uint32 idmacontrol;
        uint32 waitcount = 0;

#ifdef WL_MONITOR
        dhd->monitor_enable = FALSE;
#endif /* WL_MONITOR */

        /**
         * A user defined value can be assigned to global variable h2d_max_txpost via
         * 1. DHD IOVAR h2d_max_txpost, before firmware download
         * 2. module parameter h2d_max_txpost
         * prot->h2d_max_txpost is assigned with H2DRING_TXPOST_MAX_ITEM,
         * if user has not defined any buffers by one of the above methods.
         */
        prot->h2d_max_txpost = (uint16)h2d_max_txpost;

        DHD_ERROR(("%s:%d: h2d_max_txpost = %d\n", __FUNCTION__, __LINE__, prot->h2d_max_txpost));

        /* Read max rx packets supported by dongle */
        dhd_bus_cmn_readshared(dhd->bus, &prot->max_rxbufpost, MAX_HOST_RXBUFS, 0);
        if (prot->max_rxbufpost == 0) {
                /* This would happen if the dongle firmware is not */
                /* using the latest shared structure template */
                prot->max_rxbufpost = DEFAULT_RX_BUFFERS_TO_POST;
        }
        DHD_ERROR(("%s:%d: MAX_RXBUFPOST = %d\n", __FUNCTION__, __LINE__, prot->max_rxbufpost));

        /* Initialize.  bzero() would blow away the dma pointers. */
        prot->max_eventbufpost = DHD_FLOWRING_MAX_EVENTBUF_POST;
        prot->max_ioctlrespbufpost = DHD_FLOWRING_MAX_IOCTLRESPBUF_POST;
        prot->max_infobufpost = DHD_H2D_INFORING_MAX_BUF_POST;
        prot->max_tsbufpost = DHD_MAX_TSBUF_POST;

        prot->cur_ioctlresp_bufs_posted = 0;
        OSL_ATOMIC_INIT(dhd->osh, &prot->active_tx_count);
        prot->data_seq_no = 0;
        prot->ioctl_seq_no = 0;
        prot->rxbufpost = 0;
        prot->cur_event_bufs_posted = 0;
        prot->ioctl_state = 0;
        prot->curr_ioctl_cmd = 0;
        prot->cur_ts_bufs_posted = 0;
        prot->infobufpost = 0;

        prot->dmaxfer.srcmem.va = NULL;
        prot->dmaxfer.dstmem.va = NULL;
        prot->dmaxfer.in_progress = FALSE;

        prot->metadata_dbg = FALSE;
        prot->rx_metadata_offset = 0;
        prot->tx_metadata_offset = 0;
        prot->txp_threshold = TXP_FLUSH_MAX_ITEMS_FLUSH_CNT;

        /* To catch any rollover issues fast, starting with higher ioctl_trans_id */
        prot->ioctl_trans_id = MAXBITVAL(NBITS(prot->ioctl_trans_id)) - BUFFER_BEFORE_ROLLOVER;
        prot->ioctl_state = 0;
        prot->ioctl_status = 0;
        prot->ioctl_resplen = 0;
        prot->ioctl_received = IOCTL_WAIT;

        /* Initialize Common MsgBuf Rings */

        prot->device_ipc_version = dhd->bus->api.fw_rev;
        prot->host_ipc_version = PCIE_SHARED_VERSION;

        /* Init the host API version */
        dhd_set_host_cap(dhd);

        /* Register the interrupt function upfront */
        /* remove corerev checks in data path */
        /* do this after host/fw negotiation for DAR */
        prot->mb_ring_fn = dhd_bus_get_mbintr_fn(dhd->bus);
        prot->mb_2_ring_fn = dhd_bus_get_mbintr_2_fn(dhd->bus);

        dhd->bus->_dar_war = (dhd->bus->sih->buscorerev < 64) ? TRUE : FALSE;

        dhd_prot_ring_init(dhd, &prot->h2dring_ctrl_subn);
        dhd_prot_ring_init(dhd, &prot->h2dring_rxp_subn);
        dhd_prot_ring_init(dhd, &prot->d2hring_ctrl_cpln);

        /* Make it compatibile with pre-rev7 Firmware */
        if (prot->active_ipc_version < PCIE_SHARED_VERSION_7) {
                prot->d2hring_tx_cpln.item_len =
                        D2HRING_TXCMPLT_ITEMSIZE_PREREV7;
                prot->d2hring_rx_cpln.item_len =
                        D2HRING_RXCMPLT_ITEMSIZE_PREREV7;
        }
        dhd_prot_ring_init(dhd, &prot->d2hring_tx_cpln);
        dhd_prot_ring_init(dhd, &prot->d2hring_rx_cpln);

        dhd_prot_d2h_sync_init(dhd);

        dhd_prot_h2d_sync_init(dhd);

        /* init the scratch buffer */
        dhd_base_addr_htolpa(&base_addr, prot->d2h_dma_scratch_buf.pa);
        dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                D2H_DMA_SCRATCH_BUF, 0);
        dhd_bus_cmn_writeshared(dhd->bus, &prot->d2h_dma_scratch_buf.len,
                sizeof(prot->d2h_dma_scratch_buf.len), D2H_DMA_SCRATCH_BUF_LEN, 0);

        /* If supported by the host, indicate the memory block
         * for completion writes / submission reads to shared space
         */
        if (dhd->dma_d2h_ring_upd_support) {
                dhd_base_addr_htolpa(&base_addr, prot->d2h_dma_indx_wr_buf.pa);
                dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                        D2H_DMA_INDX_WR_BUF, 0);
                dhd_base_addr_htolpa(&base_addr, prot->h2d_dma_indx_rd_buf.pa);
                dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                        H2D_DMA_INDX_RD_BUF, 0);
        }

        if (dhd->dma_h2d_ring_upd_support || IDMA_ENAB(dhd)) {
                dhd_base_addr_htolpa(&base_addr, prot->h2d_dma_indx_wr_buf.pa);
                dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                        H2D_DMA_INDX_WR_BUF, 0);
                dhd_base_addr_htolpa(&base_addr, prot->d2h_dma_indx_rd_buf.pa);
                dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                        D2H_DMA_INDX_RD_BUF, 0);
        }

        /* Signal to the dongle that common ring init is complete */
        dhd_bus_hostready(dhd->bus);

        /*
         * If the DMA-able buffers for flowring needs to come from a specific
         * contiguous memory region, then setup prot->flowrings_dma_buf here.
         * dhd_prot_flowrings_pool_attach() will carve out DMA-able buffers from
         * this contiguous memory region, for each of the flowrings.
         */

        /* Pre-allocate pool of msgbuf_ring for flowrings */
        if (dhd_prot_flowrings_pool_attach(dhd) != BCME_OK) {
                return BCME_ERROR;
        }

        /* If IFRM is enabled, wait for FW to setup the DMA channel */
        if (IFRM_ENAB(dhd)) {
                dhd_base_addr_htolpa(&base_addr, prot->h2d_ifrm_indx_wr_buf.pa);
                dhd_bus_cmn_writeshared(dhd->bus, &base_addr, sizeof(base_addr),
                        H2D_IFRM_INDX_WR_BUF, 0);
        }

        /* If IDMA is enabled and initied, wait for FW to setup the IDMA descriptors
         * Waiting just before configuring doorbell
         */
#define IDMA_ENABLE_WAIT  10
        if (IDMA_ACTIVE(dhd)) {
                /* wait for idma_en bit in IDMAcontrol register to be set */
                /* Loop till idma_en is not set */
                uint buscorerev = dhd->bus->sih->buscorerev;
                idmacontrol = si_corereg(dhd->bus->sih, dhd->bus->sih->buscoreidx,
                        IDMAControl(buscorerev), 0, 0);
                while (!(idmacontrol & PCIE_IDMA_MODE_EN(buscorerev)) &&
                        (waitcount++ < IDMA_ENABLE_WAIT)) {

                        DHD_ERROR(("iDMA not enabled yet,waiting 1 ms c=%d IDMAControl = %08x\n",
                                waitcount, idmacontrol));
                        OSL_DELAY(1000); /* 1ms as its onetime only */
                        idmacontrol = si_corereg(dhd->bus->sih, dhd->bus->sih->buscoreidx,
                                IDMAControl(buscorerev), 0, 0);
                }

                if (waitcount < IDMA_ENABLE_WAIT) {
                        DHD_ERROR(("iDMA enabled PCIEControl = %08x\n", idmacontrol));
                } else {
                        DHD_ERROR(("Error: wait for iDMA timed out wait=%d IDMAControl = %08x\n",
                                waitcount, idmacontrol));
                        return BCME_ERROR;
                }
        }

        /* Host should configure soft doorbells if needed ... here */

        /* Post to dongle host configured soft doorbells */
        dhd_msgbuf_ring_config_d2h_soft_doorbell(dhd);

        dhd_msgbuf_rxbuf_post_ioctlresp_bufs(dhd);
        dhd_msgbuf_rxbuf_post_event_bufs(dhd);

        prot->no_retry = FALSE;
        prot->no_aggr = FALSE;
        prot->fixed_rate = FALSE;

        /*
         * Note that any communication with the Dongle should be added
         * below this point. Any other host data structure initialiation that
         * needs to be done prior to the DPC starts executing should be done
         * befor this point.
         * Because once we start sending H2D requests to Dongle, the Dongle
         * respond immediately. So the DPC context to handle this
         * D2H response could preempt the context in which dhd_prot_init is running.
         * We want to ensure that all the Host part of dhd_prot_init is
         * done before that.
         */

        /* See if info rings could be created */
        if (dhd->bus->api.fw_rev >= PCIE_SHARED_VERSION_6) {
                if ((ret = dhd_prot_init_info_rings(dhd)) != BCME_OK) {
                        /* For now log and proceed, further clean up action maybe necessary
                         * when we have more clarity.
                         */
                        DHD_ERROR(("%s Info rings couldn't be created: Err Code%d",
                                __FUNCTION__, ret));
                }
        }

        return BCME_OK;
} /* dhd_prot_init */

/**
 * dhd_prot_detach - PCIE FD protocol layer destructor.
 * Unlink, frees allocated protocol memory (including dhd_prot)
 */
void dhd_prot_detach(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;

        /* Stop the protocol module */
        if (prot) {

                /* free up all DMA-able buffers allocated during prot attach/init */

                dhd_dma_buf_free(dhd, &prot->d2h_dma_scratch_buf);
                dhd_dma_buf_free(dhd, &prot->retbuf);
                dhd_dma_buf_free(dhd, &prot->ioctbuf);
                dhd_dma_buf_free(dhd, &prot->host_bus_throughput_buf);
                dhd_dma_buf_free(dhd, &prot->hostts_req_buf);
                dhd_dma_buf_free(dhd, &prot->fw_trap_buf);

                /* DMA-able buffers for DMAing H2D/D2H WR/RD indices */
                dhd_dma_buf_free(dhd, &prot->h2d_dma_indx_wr_buf);
                dhd_dma_buf_free(dhd, &prot->h2d_dma_indx_rd_buf);
                dhd_dma_buf_free(dhd, &prot->d2h_dma_indx_wr_buf);
                dhd_dma_buf_free(dhd, &prot->d2h_dma_indx_rd_buf);

                dhd_dma_buf_free(dhd, &prot->h2d_ifrm_indx_wr_buf);

                /* Common MsgBuf Rings */
                dhd_prot_ring_detach(dhd, &prot->h2dring_ctrl_subn);
                dhd_prot_ring_detach(dhd, &prot->h2dring_rxp_subn);
                dhd_prot_ring_detach(dhd, &prot->d2hring_ctrl_cpln);
                dhd_prot_ring_detach(dhd, &prot->d2hring_tx_cpln);
                dhd_prot_ring_detach(dhd, &prot->d2hring_rx_cpln);

                /* Detach each DMA-able buffer and free the pool of msgbuf_ring_t */
                dhd_prot_flowrings_pool_detach(dhd);

                /* detach info rings */
                dhd_prot_detach_info_rings(dhd);

                /* if IOCTLRESP_USE_CONSTMEM is defined IOCTL PKTs use pktid_map_handle_ioctl
                 * handler and PKT memory is allocated using alloc_ioctl_return_buffer(), Otherwise
                 * they will be part of pktid_ctrl_map handler and PKT memory is allocated using
                 * PKTGET_STATIC (if DHD_USE_STATIC_CTRLBUF is defined) OR PKGET.
                 * Similarly for freeing PKT buffers DHD_NATIVE_TO_PKTID_FINI will be used
                 * which calls PKTFREE_STATIC (if DHD_USE_STATIC_CTRLBUF is defined) OR PKFREE.
                 * Else if IOCTLRESP_USE_CONSTMEM is defined IOCTL PKTs will be freed using
                 * DHD_NATIVE_TO_PKTID_FINI_IOCTL which calls free_ioctl_return_buffer.
                 */
                DHD_NATIVE_TO_PKTID_FINI(dhd, prot->pktid_ctrl_map);
                DHD_NATIVE_TO_PKTID_FINI(dhd, prot->pktid_rx_map);
                DHD_NATIVE_TO_PKTID_FINI(dhd, prot->pktid_tx_map);
#ifdef IOCTLRESP_USE_CONSTMEM
                DHD_NATIVE_TO_PKTID_FINI_IOCTL(dhd, prot->pktid_map_handle_ioctl);
#endif // endif
#ifdef DHD_MAP_PKTID_LOGGING
                DHD_PKTID_LOG_FINI(dhd, prot->pktid_dma_map);
                DHD_PKTID_LOG_FINI(dhd, prot->pktid_dma_unmap);
#endif /* DHD_MAP_PKTID_LOGGING */

#if defined(DHD_LB_TXC)
                if (prot->tx_compl_prod.buffer)
                        MFREE(dhd->osh, prot->tx_compl_prod.buffer,
                              sizeof(void*) * DHD_LB_WORKQ_SZ);
#endif /* DHD_LB_TXC */
#if defined(DHD_LB_RXC)
                if (prot->rx_compl_prod.buffer)
                        MFREE(dhd->osh, prot->rx_compl_prod.buffer,
                              sizeof(void*) * DHD_LB_WORKQ_SZ);
#endif /* DHD_LB_RXC */

                DHD_OS_PREFREE(dhd, dhd->prot, sizeof(dhd_prot_t));

                dhd->prot = NULL;
        }
} /* dhd_prot_detach */

/**
 * dhd_prot_reset - Reset the protocol layer without freeing any objects.
 * This may be invoked to soft reboot the dongle, without having to
 * detach and attach the entire protocol layer.
 *
 * After dhd_prot_reset(), dhd_prot_init() may be invoked
 * without going througha dhd_prot_attach() phase.
 */
void
dhd_prot_reset(dhd_pub_t *dhd)
{
        struct dhd_prot *prot = dhd->prot;

        DHD_TRACE(("%s\n", __FUNCTION__));

        if (prot == NULL) {
                return;
        }

        dhd_prot_flowrings_pool_reset(dhd);

        /* Reset Common MsgBuf Rings */
        dhd_prot_ring_reset(dhd, &prot->h2dring_ctrl_subn);
        dhd_prot_ring_reset(dhd, &prot->h2dring_rxp_subn);
        dhd_prot_ring_reset(dhd, &prot->d2hring_ctrl_cpln);
        dhd_prot_ring_reset(dhd, &prot->d2hring_tx_cpln);
        dhd_prot_ring_reset(dhd, &prot->d2hring_rx_cpln);

        /* Reset info rings */
        if (prot->h2dring_info_subn) {
                dhd_prot_ring_reset(dhd, prot->h2dring_info_subn);
        }

        if (prot->d2hring_info_cpln) {
                dhd_prot_ring_reset(dhd, prot->d2hring_info_cpln);
        }

        /* Reset all DMA-able buffers allocated during prot attach */
        dhd_dma_buf_reset(dhd, &prot->d2h_dma_scratch_buf);
        dhd_dma_buf_reset(dhd, &prot->retbuf);
        dhd_dma_buf_reset(dhd, &prot->ioctbuf);
        dhd_dma_buf_reset(dhd, &prot->host_bus_throughput_buf);
        dhd_dma_buf_reset(dhd, &prot->hostts_req_buf);
        dhd_dma_buf_reset(dhd, &prot->fw_trap_buf);

        dhd_dma_buf_reset(dhd, &prot->h2d_ifrm_indx_wr_buf);

        /* Rest all DMA-able buffers for DMAing H2D/D2H WR/RD indices */
        dhd_dma_buf_reset(dhd, &prot->h2d_dma_indx_rd_buf);
        dhd_dma_buf_reset(dhd, &prot->h2d_dma_indx_wr_buf);
        dhd_dma_buf_reset(dhd, &prot->d2h_dma_indx_rd_buf);
        dhd_dma_buf_reset(dhd, &prot->d2h_dma_indx_wr_buf);

        prot->rx_metadata_offset = 0;
        prot->tx_metadata_offset = 0;

        prot->rxbufpost = 0;
        prot->cur_event_bufs_posted = 0;
        prot->cur_ioctlresp_bufs_posted = 0;

        OSL_ATOMIC_INIT(dhd->osh, &prot->active_tx_count);
        prot->data_seq_no = 0;
        prot->ioctl_seq_no = 0;
        prot->ioctl_state = 0;
        prot->curr_ioctl_cmd = 0;
        prot->ioctl_received = IOCTL_WAIT;
        /* To catch any rollover issues fast, starting with higher ioctl_trans_id */
        prot->ioctl_trans_id = MAXBITVAL(NBITS(prot->ioctl_trans_id)) - BUFFER_BEFORE_ROLLOVER;

        /* dhd_flow_rings_init is located at dhd_bus_start,
         * so when stopping bus, flowrings shall be deleted
         */
        if (dhd->flow_rings_inited) {
                dhd_flow_rings_deinit(dhd);
        }

        /* Reset PKTID map */
        DHD_NATIVE_TO_PKTID_RESET(dhd, prot->pktid_ctrl_map);
        DHD_NATIVE_TO_PKTID_RESET(dhd, prot->pktid_rx_map);
        DHD_NATIVE_TO_PKTID_RESET(dhd, prot->pktid_tx_map);
#ifdef IOCTLRESP_USE_CONSTMEM
        DHD_NATIVE_TO_PKTID_RESET_IOCTL(dhd, prot->pktid_map_handle_ioctl);
#endif /* IOCTLRESP_USE_CONSTMEM */
#ifdef DMAMAP_STATS
        dhd->dma_stats.txdata = dhd->dma_stats.txdata_sz = 0;
        dhd->dma_stats.rxdata = dhd->dma_stats.rxdata_sz = 0;
#ifndef IOCTLRESP_USE_CONSTMEM
        dhd->dma_stats.ioctl_rx = dhd->dma_stats.ioctl_rx_sz = 0;
#endif /* IOCTLRESP_USE_CONSTMEM */
        dhd->dma_stats.event_rx = dhd->dma_stats.event_rx_sz = 0;
        dhd->dma_stats.info_rx = dhd->dma_stats.info_rx_sz = 0;
        dhd->dma_stats.tsbuf_rx = dhd->dma_stats.tsbuf_rx_sz = 0;
#endif /* DMAMAP_STATS */
} /* dhd_prot_reset */

#if defined(DHD_LB_RXP)
#define DHD_LB_DISPATCH_RX_PROCESS(dhdp)        dhd_lb_dispatch_rx_process(dhdp)
#else /* !DHD_LB_RXP */
#define DHD_LB_DISPATCH_RX_PROCESS(dhdp)        do { /* noop */ } while (0)
#endif /* !DHD_LB_RXP */

#if defined(DHD_LB_RXC)
#define DHD_LB_DISPATCH_RX_COMPL(dhdp)  dhd_lb_dispatch_rx_compl(dhdp)
#else /* !DHD_LB_RXC */
#define DHD_LB_DISPATCH_RX_COMPL(dhdp)  do { /* noop */ } while (0)
#endif /* !DHD_LB_RXC */

#if defined(DHD_LB_TXC)
#define DHD_LB_DISPATCH_TX_COMPL(dhdp)  dhd_lb_dispatch_tx_compl(dhdp)
#else /* !DHD_LB_TXC */
#define DHD_LB_DISPATCH_TX_COMPL(dhdp)  do { /* noop */ } while (0)
#endif /* !DHD_LB_TXC */

#if defined(DHD_LB)
/* DHD load balancing: deferral of work to another online CPU */
/* DHD_LB_TXC DHD_LB_RXC DHD_LB_RXP dispatchers, in dhd_linux.c */
extern void dhd_lb_tx_compl_dispatch(dhd_pub_t *dhdp);
extern void dhd_lb_rx_compl_dispatch(dhd_pub_t *dhdp);
extern void dhd_lb_rx_napi_dispatch(dhd_pub_t *dhdp);
extern void dhd_lb_rx_pkt_enqueue(dhd_pub_t *dhdp, void *pkt, int ifidx);

#if defined(DHD_LB_RXP)
/**
 * dhd_lb_dispatch_rx_process - load balance by dispatch Rx processing work
 * to other CPU cores
 */
static INLINE void
dhd_lb_dispatch_rx_process(dhd_pub_t *dhdp)
{
        dhd_lb_rx_napi_dispatch(dhdp); /* dispatch rx_process_napi */
}
#endif /* DHD_LB_RXP */

#if defined(DHD_LB_TXC)
/**
 * dhd_lb_dispatch_tx_compl - load balance by dispatch Tx complition work
 * to other CPU cores
 */
static INLINE void
dhd_lb_dispatch_tx_compl(dhd_pub_t *dhdp, uint16 ring_idx)
{
        bcm_workq_prod_sync(&dhdp->prot->tx_compl_prod); /* flush WR index */
        dhd_lb_tx_compl_dispatch(dhdp); /* dispatch tx_compl_tasklet */
}

/**
 * DHD load balanced tx completion tasklet handler, that will perform the
 * freeing of packets on the selected CPU. Packet pointers are delivered to
 * this tasklet via the tx complete workq.
 */
void
dhd_lb_tx_compl_handler(unsigned long data)
{
        int elem_ix;
        void *pkt, **elem;
        dmaaddr_t pa;
        uint32 pa_len;
        dhd_pub_t *dhd = (dhd_pub_t *)data;
        dhd_prot_t *prot = dhd->prot;
        bcm_workq_t *workq = &prot->tx_compl_cons;
        uint32 count = 0;

        int curr_cpu;
        curr_cpu = get_cpu();
        put_cpu();

        DHD_LB_STATS_TXC_PERCPU_CNT_INCR(dhd);

        while (1) {
                elem_ix = bcm_ring_cons(WORKQ_RING(workq), DHD_LB_WORKQ_SZ);

                if (elem_ix == BCM_RING_EMPTY) {
                        break;
                }

                elem = WORKQ_ELEMENT(void *, workq, elem_ix);
                pkt = *elem;

                DHD_INFO(("%s: tx_compl_cons pkt<%p>\n", __FUNCTION__, pkt));

                OSL_PREFETCH(PKTTAG(pkt));
                OSL_PREFETCH(pkt);

                pa = DHD_PKTTAG_PA((dhd_pkttag_fr_t *)PKTTAG(pkt));
                pa_len = DHD_PKTTAG_PA_LEN((dhd_pkttag_fr_t *)PKTTAG(pkt));

                DMA_UNMAP(dhd->osh, pa, pa_len, DMA_RX, 0, 0);
#if defined(BCMPCIE)
                dhd_txcomplete(dhd, pkt, true);
#endif // endif

                PKTFREE(dhd->osh, pkt, TRUE);
                count++;
        }

        /* smp_wmb(); */
        bcm_workq_cons_sync(workq);
        DHD_LB_STATS_UPDATE_TXC_HISTO(dhd, count);
}
#endif /* DHD_LB_TXC */

#if defined(DHD_LB_RXC)

/**
 * dhd_lb_dispatch_rx_compl - load balance by dispatch rx complition work
 * to other CPU cores
 */
static INLINE void
dhd_lb_dispatch_rx_compl(dhd_pub_t *dhdp)
{
        dhd_prot_t *prot = dhdp->prot;
        /* Schedule the takslet only if we have to */
        if (prot->rxbufpost <= (prot->max_rxbufpost - RXBUFPOST_THRESHOLD)) {
                /* flush WR index */
                bcm_workq_prod_sync(&dhdp->prot->rx_compl_prod);
                dhd_lb_rx_compl_dispatch(dhdp); /* dispatch rx_compl_tasklet */
        }
}

void
dhd_lb_rx_compl_handler(unsigned long data)
{
        dhd_pub_t *dhd = (dhd_pub_t *)data;
        bcm_workq_t *workq = &dhd->prot->rx_compl_cons;

        DHD_LB_STATS_RXC_PERCPU_CNT_INCR(dhd);

        dhd_msgbuf_rxbuf_post(dhd, TRUE); /* re-use pktids */
        bcm_workq_cons_sync(workq);
}
#endif /* DHD_LB_RXC */
#endif /* DHD_LB */

void
dhd_prot_rx_dataoffset(dhd_pub_t *dhd, uint32 rx_offset)
{
        dhd_prot_t *prot = dhd->prot;
        prot->rx_dataoffset = rx_offset;
}

static int
dhd_check_create_info_rings(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        int ret = BCME_ERROR;
        uint16 ringid;

        {
                /* dongle may increase max_submission_rings so keep
                 * ringid at end of dynamic rings
                 */
                ringid = dhd->bus->max_tx_flowrings +
                        (dhd->bus->max_submission_rings - dhd->bus->max_tx_flowrings) +
                        BCMPCIE_H2D_COMMON_MSGRINGS;
        }

        if (prot->h2dring_info_subn && prot->d2hring_info_cpln) {
                return BCME_OK; /* dhd_prot_init rentry after a dhd_prot_reset */
        }

        if (prot->h2dring_info_subn == NULL) {
                prot->h2dring_info_subn = MALLOCZ(prot->osh, sizeof(msgbuf_ring_t));

                if (prot->h2dring_info_subn == NULL) {
                        DHD_ERROR(("%s: couldn't alloc memory for h2dring_info_subn\n",
                                __FUNCTION__));
                        return BCME_NOMEM;
                }

                DHD_INFO(("%s: about to create debug submit ring\n", __FUNCTION__));
                ret = dhd_prot_ring_attach(dhd, prot->h2dring_info_subn, "h2dinfo",
                        H2DRING_DYNAMIC_INFO_MAX_ITEM, H2DRING_INFO_BUFPOST_ITEMSIZE,
                        ringid);
                if (ret != BCME_OK) {
                        DHD_ERROR(("%s: couldn't alloc resources for dbg submit ring\n",
                                __FUNCTION__));
                        goto err;
                }
        }

        if (prot->d2hring_info_cpln == NULL) {
                prot->d2hring_info_cpln = MALLOCZ(prot->osh, sizeof(msgbuf_ring_t));

                if (prot->d2hring_info_cpln == NULL) {
                        DHD_ERROR(("%s: couldn't alloc memory for h2dring_info_subn\n",
                                __FUNCTION__));
                        return BCME_NOMEM;
                }

                /* create the debug info completion ring next to debug info submit ring
                * ringid = id next to debug info submit ring
                */
                ringid = ringid + 1;

                DHD_INFO(("%s: about to create debug cpl ring\n", __FUNCTION__));
                ret = dhd_prot_ring_attach(dhd, prot->d2hring_info_cpln, "d2hinfo",
                        D2HRING_DYNAMIC_INFO_MAX_ITEM, D2HRING_INFO_BUFCMPLT_ITEMSIZE,
                        ringid);
                if (ret != BCME_OK) {
                        DHD_ERROR(("%s: couldn't alloc resources for dbg cpl ring\n",
                                __FUNCTION__));
                        dhd_prot_ring_detach(dhd, prot->h2dring_info_subn);
                        goto err;
                }
        }

        return ret;
err:
        MFREE(prot->osh, prot->h2dring_info_subn, sizeof(msgbuf_ring_t));
        prot->h2dring_info_subn = NULL;

        if (prot->d2hring_info_cpln) {
                MFREE(prot->osh, prot->d2hring_info_cpln, sizeof(msgbuf_ring_t));
                prot->d2hring_info_cpln = NULL;
        }
        return ret;
} /* dhd_check_create_info_rings */

int
dhd_prot_init_info_rings(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        int ret = BCME_OK;

        if ((ret = dhd_check_create_info_rings(dhd)) != BCME_OK) {
                DHD_ERROR(("%s: info rings aren't created! \n",
                        __FUNCTION__));
                return ret;
        }

        if ((prot->d2hring_info_cpln->inited) || (prot->d2hring_info_cpln->create_pending)) {
                DHD_INFO(("Info completion ring was created!\n"));
                return ret;
        }

        DHD_TRACE(("trying to send create d2h info ring: id %d\n", prot->d2hring_info_cpln->idx));
        ret = dhd_send_d2h_ringcreate(dhd, prot->d2hring_info_cpln,
                BCMPCIE_D2H_RING_TYPE_DBGBUF_CPL, DHD_D2H_DBGRING_REQ_PKTID);
        if (ret != BCME_OK)
                return ret;

        prot->d2hring_info_cpln->seqnum = D2H_EPOCH_INIT_VAL;

        DHD_TRACE(("trying to send create h2d info ring id %d\n", prot->h2dring_info_subn->idx));
        prot->h2dring_info_subn->n_completion_ids = 1;
        prot->h2dring_info_subn->compeltion_ring_ids[0] = prot->d2hring_info_cpln->idx;

        ret = dhd_send_h2d_ringcreate(dhd, prot->h2dring_info_subn,
                BCMPCIE_H2D_RING_TYPE_DBGBUF_SUBMIT, DHD_H2D_DBGRING_REQ_PKTID);

        /* Note that there is no way to delete d2h or h2d ring deletion incase either fails,
         * so can not cleanup if one ring was created while the other failed
         */
        return ret;
} /* dhd_prot_init_info_rings */

static void
dhd_prot_detach_info_rings(dhd_pub_t *dhd)
{
        if (dhd->prot->h2dring_info_subn) {
                dhd_prot_ring_detach(dhd, dhd->prot->h2dring_info_subn);
                MFREE(dhd->prot->osh, dhd->prot->h2dring_info_subn, sizeof(msgbuf_ring_t));
                dhd->prot->h2dring_info_subn = NULL;
        }
        if (dhd->prot->d2hring_info_cpln) {
                dhd_prot_ring_detach(dhd, dhd->prot->d2hring_info_cpln);
                MFREE(dhd->prot->osh, dhd->prot->d2hring_info_cpln, sizeof(msgbuf_ring_t));
                dhd->prot->d2hring_info_cpln = NULL;
        }
}

/**
 * Initialize protocol: sync w/dongle state.
 * Sets dongle media info (iswl, drv_version, mac address).
 */
int dhd_sync_with_dongle(dhd_pub_t *dhd)
{
        int ret = 0;
        wlc_rev_info_t revinfo;
        char buf[128];
        dhd_prot_t *prot = dhd->prot;

        DHD_TRACE(("%s: Enter\n", __FUNCTION__));

        dhd_os_set_ioctl_resp_timeout(IOCTL_RESP_TIMEOUT);

        /* Post ts buffer after shim layer is attached */
        ret = dhd_msgbuf_rxbuf_post_ts_bufs(dhd);

#ifdef DHD_FW_COREDUMP
        /* Check the memdump capability */
        dhd_get_memdump_info(dhd);
#endif /* DHD_FW_COREDUMP */
#ifdef BCMASSERT_LOG
        dhd_get_assert_info(dhd);
#endif /* BCMASSERT_LOG */

        /* Get the device rev info */
        memset(&revinfo, 0, sizeof(revinfo));
        ret = dhd_wl_ioctl_cmd(dhd, WLC_GET_REVINFO, &revinfo, sizeof(revinfo), FALSE, 0);
        if (ret < 0) {
                DHD_ERROR(("%s: GET revinfo FAILED\n", __FUNCTION__));
                goto done;
        }
        DHD_ERROR(("%s: GET_REVINFO device 0x%x, vendor 0x%x, chipnum 0x%x\n", __FUNCTION__,
                revinfo.deviceid, revinfo.vendorid, revinfo.chipnum));

        /* Get the RxBuf post size */
        memset(buf, 0, sizeof(buf));
        bcm_mkiovar("rxbufpost_sz", NULL, 0, buf, sizeof(buf));
        ret = dhd_wl_ioctl_cmd(dhd, WLC_GET_VAR, buf, sizeof(buf), FALSE, 0);
        if (ret < 0) {
                DHD_ERROR(("%s: GET RxBuf post FAILED, default to %d\n",
                        __FUNCTION__, DHD_FLOWRING_RX_BUFPOST_PKTSZ));
                prot->rxbufpost_sz = DHD_FLOWRING_RX_BUFPOST_PKTSZ;
        } else {
                memcpy(&(prot->rxbufpost_sz), buf, sizeof(uint16));
                if ((prot->rxbufpost_sz < DHD_FLOWRING_RX_BUFPOST_PKTSZ) ||
                        (prot->rxbufpost_sz > DHD_FLOWRING_RX_BUFPOST_PKTSZ_MAX)) {
                        DHD_ERROR(("%s: Invalid RxBuf post size : %d, default to %d\n",
                                __FUNCTION__, prot->rxbufpost_sz, DHD_FLOWRING_RX_BUFPOST_PKTSZ));
                        prot->rxbufpost_sz = DHD_FLOWRING_RX_BUFPOST_PKTSZ;
                } else {
                        DHD_ERROR(("%s: RxBuf Post : %d\n", __FUNCTION__, prot->rxbufpost_sz));
                }
        }

        /* Post buffers for packet reception */
        dhd_msgbuf_rxbuf_post(dhd, FALSE); /* alloc pkt ids */

        DHD_SSSR_DUMP_INIT(dhd);

        dhd_process_cid_mac(dhd, TRUE);
        ret = dhd_preinit_ioctls(dhd);
        dhd_process_cid_mac(dhd, FALSE);

        /* Always assumes wl for now */
        dhd->iswl = TRUE;
done:
        return ret;
} /* dhd_sync_with_dongle */

#define DHD_DBG_SHOW_METADATA   0

#if DHD_DBG_SHOW_METADATA
static void BCMFASTPATH
dhd_prot_print_metadata(dhd_pub_t *dhd, void *ptr, int len)
{
        uint8 tlv_t;
        uint8 tlv_l;
        uint8 *tlv_v = (uint8 *)ptr;

        if (len <= BCMPCIE_D2H_METADATA_HDRLEN)
                return;

        len -= BCMPCIE_D2H_METADATA_HDRLEN;
        tlv_v += BCMPCIE_D2H_METADATA_HDRLEN;

        while (len > TLV_HDR_LEN) {
                tlv_t = tlv_v[TLV_TAG_OFF];
                tlv_l = tlv_v[TLV_LEN_OFF];

                len -= TLV_HDR_LEN;
                tlv_v += TLV_HDR_LEN;
                if (len < tlv_l)
                        break;
                if ((tlv_t == 0) || (tlv_t == WLFC_CTL_TYPE_FILLER))
                        break;

                switch (tlv_t) {
                case WLFC_CTL_TYPE_TXSTATUS: {
                        uint32 txs;
                        memcpy(&txs, tlv_v, sizeof(uint32));
                        if (tlv_l < (sizeof(wl_txstatus_additional_info_t) + sizeof(uint32))) {
                                printf("METADATA TX_STATUS: %08x\n", txs);
                        } else {
                                wl_txstatus_additional_info_t tx_add_info;
                                memcpy(&tx_add_info, tlv_v + sizeof(uint32),
                                        sizeof(wl_txstatus_additional_info_t));
                                printf("METADATA TX_STATUS: %08x WLFCTS[%04x | %08x - %08x - %08x]"
                                        " rate = %08x tries = %d - %d\n", txs,
                                        tx_add_info.seq, tx_add_info.entry_ts,
                                        tx_add_info.enq_ts, tx_add_info.last_ts,
                                        tx_add_info.rspec, tx_add_info.rts_cnt,
                                        tx_add_info.tx_cnt);
                        }
                        } break;

                case WLFC_CTL_TYPE_RSSI: {
                        if (tlv_l == 1)
                                printf("METADATA RX_RSSI: rssi = %d\n", *tlv_v);
                        else
                                printf("METADATA RX_RSSI[%04x]: rssi = %d snr = %d\n",
                                        (*(tlv_v + 3) << 8) | *(tlv_v + 2),
                                        (int8)(*tlv_v), *(tlv_v + 1));
                        } break;

                case WLFC_CTL_TYPE_FIFO_CREDITBACK:
                        bcm_print_bytes("METADATA FIFO_CREDITBACK", tlv_v, tlv_l);
                        break;

                case WLFC_CTL_TYPE_TX_ENTRY_STAMP:
                        bcm_print_bytes("METADATA TX_ENTRY", tlv_v, tlv_l);
                        break;

                case WLFC_CTL_TYPE_RX_STAMP: {
                        struct {
                                uint32 rspec;
                                uint32 bus_time;
                                uint32 wlan_time;
                        } rx_tmstamp;
                        memcpy(&rx_tmstamp, tlv_v, sizeof(rx_tmstamp));
                        printf("METADATA RX TIMESTMAP: WLFCTS[%08x - %08x] rate = %08x\n",
                                rx_tmstamp.wlan_time, rx_tmstamp.bus_time, rx_tmstamp.rspec);
                        } break;

                case WLFC_CTL_TYPE_TRANS_ID:
                        bcm_print_bytes("METADATA TRANS_ID", tlv_v, tlv_l);
                        break;

                case WLFC_CTL_TYPE_COMP_TXSTATUS:
                        bcm_print_bytes("METADATA COMP_TXSTATUS", tlv_v, tlv_l);
                        break;

                default:
                        bcm_print_bytes("METADATA UNKNOWN", tlv_v, tlv_l);
                        break;
                }

                len -= tlv_l;
                tlv_v += tlv_l;
        }
}
#endif /* DHD_DBG_SHOW_METADATA */

static INLINE void BCMFASTPATH
dhd_prot_packet_free(dhd_pub_t *dhd, void *pkt, uint8 pkttype, bool send)
{
        if (pkt) {
                if (pkttype == PKTTYPE_IOCTL_RX ||
                        pkttype == PKTTYPE_EVENT_RX ||
                        pkttype == PKTTYPE_INFO_RX ||
                        pkttype == PKTTYPE_TSBUF_RX) {
#ifdef DHD_USE_STATIC_CTRLBUF
                        PKTFREE_STATIC(dhd->osh, pkt, send);
#else
                        PKTFREE(dhd->osh, pkt, send);
#endif /* DHD_USE_STATIC_CTRLBUF */
                } else {
                        PKTFREE(dhd->osh, pkt, send);
                }
        }
}

/**
 * dhd_prot_packet_get should be called only for items having pktid_ctrl_map handle
 * and all the bottom most functions like dhd_pktid_map_free hold separate DHD_PKTID_LOCK
 * to ensure thread safety, so no need to hold any locks for this function
 */
static INLINE void * BCMFASTPATH
dhd_prot_packet_get(dhd_pub_t *dhd, uint32 pktid, uint8 pkttype, bool free_pktid)
{
        void *PKTBUF;
        dmaaddr_t pa;
        uint32 len;
        void *dmah;
        void *secdma;

#ifdef DHD_PCIE_PKTID
        if (free_pktid) {
                PKTBUF = DHD_PKTID_TO_NATIVE(dhd, dhd->prot->pktid_ctrl_map,
                        pktid, pa, len, dmah, secdma, pkttype);
        } else {
                PKTBUF = DHD_PKTID_TO_NATIVE_RSV(dhd, dhd->prot->pktid_ctrl_map,
                        pktid, pa, len, dmah, secdma, pkttype);
        }
#else
        PKTBUF = DHD_PKTID_TO_NATIVE(dhd, dhd->prot->pktid_ctrl_map, pktid, pa,
                len, dmah, secdma, pkttype);
#endif /* DHD_PCIE_PKTID */
        if (PKTBUF) {
                {
                        if (SECURE_DMA_ENAB(dhd->osh))
                                SECURE_DMA_UNMAP(dhd->osh, pa, (uint) len, DMA_RX, 0, dmah,
                                        secdma, 0);
                        else
                                DMA_UNMAP(dhd->osh, pa, (uint) len, DMA_RX, 0, dmah);
#ifdef DMAMAP_STATS
                        switch (pkttype) {
#ifndef IOCTLRESP_USE_CONSTMEM
                                case PKTTYPE_IOCTL_RX:
                                        dhd->dma_stats.ioctl_rx--;
                                        dhd->dma_stats.ioctl_rx_sz -= len;
                                        break;
#endif /* IOCTLRESP_USE_CONSTMEM */
                                case PKTTYPE_EVENT_RX:
                                        dhd->dma_stats.event_rx--;
                                        dhd->dma_stats.event_rx_sz -= len;
                                        break;
                                case PKTTYPE_INFO_RX:
                                        dhd->dma_stats.info_rx--;
                                        dhd->dma_stats.info_rx_sz -= len;
                                        break;
                                case PKTTYPE_TSBUF_RX:
                                        dhd->dma_stats.tsbuf_rx--;
                                        dhd->dma_stats.tsbuf_rx_sz -= len;
                                        break;
                        }
#endif /* DMAMAP_STATS */
                }
        }

        return PKTBUF;
}

#ifdef IOCTLRESP_USE_CONSTMEM
static INLINE void BCMFASTPATH
dhd_prot_ioctl_ret_buffer_get(dhd_pub_t *dhd, uint32 pktid, dhd_dma_buf_t *retbuf)
{
        memset(retbuf, 0, sizeof(dhd_dma_buf_t));
        retbuf->va = DHD_PKTID_TO_NATIVE(dhd, dhd->prot->pktid_map_handle_ioctl, pktid,
                retbuf->pa, retbuf->len, retbuf->dmah, retbuf->secdma, PKTTYPE_IOCTL_RX);

        return;
}
#endif // endif

static void BCMFASTPATH
dhd_msgbuf_rxbuf_post(dhd_pub_t *dhd, bool use_rsv_pktid)
{
        dhd_prot_t *prot = dhd->prot;
        int16 fillbufs;
        uint16 cnt = 256;
        int retcount = 0;

        fillbufs = prot->max_rxbufpost - prot->rxbufpost;
        while (fillbufs >= RX_BUF_BURST) {
                cnt--;
                if (cnt == 0) {
                        /* find a better way to reschedule rx buf post if space not available */
                        DHD_ERROR(("h2d rx post ring not available to post host buffers \n"));
                        DHD_ERROR(("Current posted host buf count %d \n", prot->rxbufpost));
                        break;
                }

                /* Post in a burst of 32 buffers at a time */
                fillbufs = MIN(fillbufs, RX_BUF_BURST);

                /* Post buffers */
                retcount = dhd_prot_rxbuf_post(dhd, fillbufs, use_rsv_pktid);

                if (retcount >= 0) {
                        prot->rxbufpost += (uint16)retcount;
#ifdef DHD_LB_RXC
                        /* dhd_prot_rxbuf_post returns the number of buffers posted */
                        DHD_LB_STATS_UPDATE_RXC_HISTO(dhd, retcount);
#endif /* DHD_LB_RXC */
                        /* how many more to post */
                        fillbufs = prot->max_rxbufpost - prot->rxbufpost;
                } else {
                        /* Make sure we don't run loop any further */
                        fillbufs = 0;
                }
        }
}

/** Post 'count' no of rx buffers to dongle */
static int BCMFASTPATH
dhd_prot_rxbuf_post(dhd_pub_t *dhd, uint16 count, bool use_rsv_pktid)
{
        void *p, **pktbuf;
        uint8 *rxbuf_post_tmp;
        host_rxbuf_post_t *rxbuf_post;
        void *msg_start;
        dmaaddr_t pa, *pktbuf_pa;
        uint32 *pktlen;
        uint16 i = 0, alloced = 0;
        unsigned long flags;
        uint32 pktid;
        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring = &prot->h2dring_rxp_subn;
        void *lcl_buf;
        uint16 lcl_buf_size;
        uint16 pktsz = prot->rxbufpost_sz;

        /* allocate a local buffer to store pkt buffer va, pa and length */
        lcl_buf_size = (sizeof(void *) + sizeof(dmaaddr_t) + sizeof(uint32)) *
                RX_BUF_BURST;
        lcl_buf = MALLOC(dhd->osh, lcl_buf_size);
        if (!lcl_buf) {
                DHD_ERROR(("%s: local scratch buffer allocation failed\n", __FUNCTION__));
                return 0;
        }
        pktbuf = lcl_buf;
        pktbuf_pa = (dmaaddr_t *)((uint8 *)pktbuf + sizeof(void *) * RX_BUF_BURST);
        pktlen = (uint32 *)((uint8 *)pktbuf_pa + sizeof(dmaaddr_t) * RX_BUF_BURST);

        for (i = 0; i < count; i++) {
                if ((p = PKTGET(dhd->osh, pktsz, FALSE)) == NULL) {
                        DHD_ERROR(("%s:%d: PKTGET for rxbuf failed\n", __FUNCTION__, __LINE__));
                        dhd->rx_pktgetfail++;
                        break;
                }

                pktlen[i] = PKTLEN(dhd->osh, p);
                if (SECURE_DMA_ENAB(dhd->osh)) {
                        pa = SECURE_DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen[i],
                                DMA_RX, p, 0, ring->dma_buf.secdma, 0);
                }
#ifndef BCM_SECURE_DMA
                else
                        pa = DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen[i], DMA_RX, p, 0);
#endif /* #ifndef BCM_SECURE_DMA */

                if (PHYSADDRISZERO(pa)) {
                        PKTFREE(dhd->osh, p, FALSE);
                        DHD_ERROR(("Invalid phyaddr 0\n"));
                        ASSERT(0);
                        break;
                }
#ifdef DMAMAP_STATS
                dhd->dma_stats.rxdata++;
                dhd->dma_stats.rxdata_sz += pktlen[i];
#endif /* DMAMAP_STATS */

                PKTPULL(dhd->osh, p, prot->rx_metadata_offset);
                pktlen[i] = PKTLEN(dhd->osh, p);
                pktbuf[i] = p;
                pktbuf_pa[i] = pa;
        }

        /* only post what we have */
        count = i;

        /* grab the ring lock to allocate pktid and post on ring */
        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Claim space for exactly 'count' no of messages, for mitigation purpose */
        msg_start = (void *)
                dhd_prot_alloc_ring_space(dhd, ring, count, &alloced, TRUE);
        if (msg_start == NULL) {
                DHD_INFO(("%s:%d: Rxbufpost Msgbuf Not available\n", __FUNCTION__, __LINE__));
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                goto cleanup;
        }
        /* if msg_start !=  NULL, we should have alloced space for atleast 1 item */
        ASSERT(alloced > 0);

        rxbuf_post_tmp = (uint8*)msg_start;

        for (i = 0; i < alloced; i++) {
                rxbuf_post = (host_rxbuf_post_t *)rxbuf_post_tmp;
                p = pktbuf[i];
                pa = pktbuf_pa[i];

#if defined(DHD_LB_RXC)
                if (use_rsv_pktid == TRUE) {
                        bcm_workq_t *workq = &prot->rx_compl_cons;
                        int elem_ix = bcm_ring_cons(WORKQ_RING(workq), DHD_LB_WORKQ_SZ);

                        if (elem_ix == BCM_RING_EMPTY) {
                                DHD_INFO(("%s rx_compl_cons ring is empty\n", __FUNCTION__));
                                pktid = DHD_PKTID_INVALID;
                                goto alloc_pkt_id;
                        } else {
                                uint32 *elem = WORKQ_ELEMENT(uint32, workq, elem_ix);
                                pktid = *elem;
                        }

                        rxbuf_post->cmn_hdr.request_id = htol32(pktid);

                        /* Now populate the previous locker with valid information */
                        if (pktid != DHD_PKTID_INVALID) {
                                DHD_NATIVE_TO_PKTID_SAVE(dhd, dhd->prot->pktid_rx_map,
                                        p, pktid, pa, pktlen[i], DMA_RX, NULL, NULL,
                                        PKTTYPE_DATA_RX);
                        }
                } else
#endif /* ! DHD_LB_RXC */
                {
#if defined(DHD_LB_RXC)
alloc_pkt_id:
#endif /* DHD_LB_RXC */
                pktid = DHD_NATIVE_TO_PKTID(dhd, dhd->prot->pktid_rx_map, p, pa,
                        pktlen[i], DMA_RX, NULL, ring->dma_buf.secdma, PKTTYPE_DATA_RX);
#if defined(DHD_PCIE_PKTID)
                if (pktid == DHD_PKTID_INVALID) {
                        break;
                }
#endif /* DHD_PCIE_PKTID */
                }

                /* Common msg header */
                rxbuf_post->cmn_hdr.msg_type = MSG_TYPE_RXBUF_POST;
                rxbuf_post->cmn_hdr.if_id = 0;
                rxbuf_post->cmn_hdr.epoch = ring->seqnum % H2D_EPOCH_MODULO;
                rxbuf_post->cmn_hdr.flags = ring->current_phase;
                ring->seqnum++;
                rxbuf_post->data_buf_len = htol16((uint16)pktlen[i]);
                rxbuf_post->data_buf_addr.high_addr = htol32(PHYSADDRHI(pa));
                rxbuf_post->data_buf_addr.low_addr =
                        htol32(PHYSADDRLO(pa) + prot->rx_metadata_offset);

                if (prot->rx_metadata_offset) {
                        rxbuf_post->metadata_buf_len = prot->rx_metadata_offset;
                        rxbuf_post->metadata_buf_addr.high_addr = htol32(PHYSADDRHI(pa));
                        rxbuf_post->metadata_buf_addr.low_addr  = htol32(PHYSADDRLO(pa));
                } else {
                        rxbuf_post->metadata_buf_len = 0;
                        rxbuf_post->metadata_buf_addr.high_addr = 0;
                        rxbuf_post->metadata_buf_addr.low_addr  = 0;
                }

#ifdef DHD_PKTID_AUDIT_RING
                DHD_PKTID_AUDIT(dhd, prot->pktid_rx_map, pktid, DHD_DUPLICATE_ALLOC);
#endif /* DHD_PKTID_AUDIT_RING */

                rxbuf_post->cmn_hdr.request_id = htol32(pktid);

                /* Move rxbuf_post_tmp to next item */
                rxbuf_post_tmp = rxbuf_post_tmp + ring->item_len;

#ifdef DHD_LBUF_AUDIT
                PKTAUDIT(dhd->osh, p);
#endif // endif
        }

        if (i < alloced) {
                if (ring->wr < (alloced - i))
                        ring->wr = ring->max_items - (alloced - i);
                else
                        ring->wr -= (alloced - i);

                if (ring->wr == 0) {
                        DHD_INFO(("%s: flipping the phase now\n", ring->name));
                                ring->current_phase = ring->current_phase ?
                                0 : BCMPCIE_CMNHDR_PHASE_BIT_INIT;
                }

                alloced = i;
        }

        /* update ring's WR index and ring doorbell to dongle */
        if (alloced > 0) {
                dhd_prot_ring_write_complete(dhd, ring, msg_start, alloced);
        }

        DHD_RING_UNLOCK(ring->ring_lock, flags);

cleanup:
        for (i = alloced; i < count; i++) {
                p = pktbuf[i];
                pa = pktbuf_pa[i];

                if (SECURE_DMA_ENAB(dhd->osh))
                        SECURE_DMA_UNMAP(dhd->osh, pa, pktlen[i], DMA_RX, 0,
                                DHD_DMAH_NULL, ring->dma_buf.secdma, 0);
                else
                        DMA_UNMAP(dhd->osh, pa, pktlen[i], DMA_RX, 0, DHD_DMAH_NULL);
                PKTFREE(dhd->osh, p, FALSE);
        }

        MFREE(dhd->osh, lcl_buf, lcl_buf_size);

        return alloced;
} /* dhd_prot_rxbufpost */

static int
dhd_prot_infobufpost(dhd_pub_t *dhd, msgbuf_ring_t *ring)
{
        unsigned long flags;
        uint32 pktid;
        dhd_prot_t *prot = dhd->prot;
        uint16 alloced = 0;
        uint16 pktsz = DHD_INFOBUF_RX_BUFPOST_PKTSZ;
        uint32 pktlen;
        info_buf_post_msg_t *infobuf_post;
        uint8 *infobuf_post_tmp;
        void *p;
        void* msg_start;
        uint8 i = 0;
        dmaaddr_t pa;
        int16 count = 0;

        if (ring == NULL)
                return 0;

        if (ring->inited != TRUE)
                return 0;
        if (ring == dhd->prot->h2dring_info_subn) {
                if (prot->max_infobufpost == 0)
                        return 0;

                count = prot->max_infobufpost - prot->infobufpost;
        }
        else {
                DHD_ERROR(("Unknown ring\n"));
                return 0;
        }

        if (count <= 0) {
                DHD_INFO(("%s: Cannot post more than max info resp buffers\n",
                        __FUNCTION__));
                return 0;
        }

        /* grab the ring lock to allocate pktid and post on ring */
        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Claim space for exactly 'count' no of messages, for mitigation purpose */
        msg_start = (void *) dhd_prot_alloc_ring_space(dhd, ring, count, &alloced, FALSE);

        if (msg_start == NULL) {
                DHD_INFO(("%s:%d: infobufpost Msgbuf Not available\n", __FUNCTION__, __LINE__));
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return -1;
        }

        /* if msg_start !=  NULL, we should have alloced space for atleast 1 item */
        ASSERT(alloced > 0);

        infobuf_post_tmp = (uint8*) msg_start;

        /* loop through each allocated message in the host ring */
        for (i = 0; i < alloced; i++) {
                infobuf_post = (info_buf_post_msg_t *) infobuf_post_tmp;
                /* Create a rx buffer */
#ifdef DHD_USE_STATIC_CTRLBUF
                p = PKTGET_STATIC(dhd->osh, pktsz, FALSE);
#else
                p = PKTGET(dhd->osh, pktsz, FALSE);
#endif /* DHD_USE_STATIC_CTRLBUF */
                if (p == NULL) {
                        DHD_ERROR(("%s:%d: PKTGET for infobuf failed\n", __FUNCTION__, __LINE__));
                        dhd->rx_pktgetfail++;
                        break;
                }
                pktlen = PKTLEN(dhd->osh, p);
                if (SECURE_DMA_ENAB(dhd->osh)) {
                        pa = SECURE_DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen,
                                DMA_RX, p, 0, ring->dma_buf.secdma, 0);
                }
#ifndef BCM_SECURE_DMA
                else
                        pa = DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen, DMA_RX, p, 0);
#endif /* #ifndef BCM_SECURE_DMA */
                if (PHYSADDRISZERO(pa)) {
                        if (SECURE_DMA_ENAB(dhd->osh)) {
                                SECURE_DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL,
                                        ring->dma_buf.secdma, 0);
                        }
                        else
                                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL);
#ifdef DHD_USE_STATIC_CTRLBUF
                        PKTFREE_STATIC(dhd->osh, p, FALSE);
#else
                        PKTFREE(dhd->osh, p, FALSE);
#endif /* DHD_USE_STATIC_CTRLBUF */
                        DHD_ERROR(("Invalid phyaddr 0\n"));
                        ASSERT(0);
                        break;
                }
#ifdef DMAMAP_STATS
                dhd->dma_stats.info_rx++;
                dhd->dma_stats.info_rx_sz += pktlen;
#endif /* DMAMAP_STATS */
                pktlen = PKTLEN(dhd->osh, p);

                /* Common msg header */
                infobuf_post->cmn_hdr.msg_type = MSG_TYPE_INFO_BUF_POST;
                infobuf_post->cmn_hdr.if_id = 0;
                infobuf_post->cmn_hdr.epoch = ring->seqnum % H2D_EPOCH_MODULO;
                infobuf_post->cmn_hdr.flags = ring->current_phase;
                ring->seqnum++;

                pktid = DHD_NATIVE_TO_PKTID(dhd, dhd->prot->pktid_ctrl_map, p, pa,
                        pktlen, DMA_RX, NULL, ring->dma_buf.secdma, PKTTYPE_INFO_RX);

#if defined(DHD_PCIE_PKTID)
                if (pktid == DHD_PKTID_INVALID) {
                        if (SECURE_DMA_ENAB(dhd->osh)) {
                                SECURE_DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, 0,
                                        ring->dma_buf.secdma, 0);
                        } else
                                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, 0);

#ifdef DHD_USE_STATIC_CTRLBUF
                        PKTFREE_STATIC(dhd->osh, p, FALSE);
#else
                        PKTFREE(dhd->osh, p, FALSE);
#endif /* DHD_USE_STATIC_CTRLBUF */
                        DHD_ERROR_RLMT(("%s: Pktid pool depleted.\n", __FUNCTION__));
                        break;
                }
#endif /* DHD_PCIE_PKTID */

                infobuf_post->host_buf_len = htol16((uint16)pktlen);
                infobuf_post->host_buf_addr.high_addr = htol32(PHYSADDRHI(pa));
                infobuf_post->host_buf_addr.low_addr = htol32(PHYSADDRLO(pa));

#ifdef DHD_PKTID_AUDIT_RING
                DHD_PKTID_AUDIT(dhd, prot->pktid_ctrl_map, pktid, DHD_DUPLICATE_ALLOC);
#endif /* DHD_PKTID_AUDIT_RING */

                DHD_INFO(("ID %d, low_addr 0x%08x, high_addr 0x%08x\n",
                        infobuf_post->cmn_hdr.request_id,  infobuf_post->host_buf_addr.low_addr,
                        infobuf_post->host_buf_addr.high_addr));

                infobuf_post->cmn_hdr.request_id = htol32(pktid);
                /* Move rxbuf_post_tmp to next item */
                infobuf_post_tmp = infobuf_post_tmp + ring->item_len;
#ifdef DHD_LBUF_AUDIT
                PKTAUDIT(dhd->osh, p);
#endif // endif
        }

        if (i < alloced) {
                if (ring->wr < (alloced - i))
                        ring->wr = ring->max_items - (alloced - i);
                else
                        ring->wr -= (alloced - i);

                alloced = i;
                if (alloced && ring->wr == 0) {
                        DHD_INFO(("%s: flipping the phase now\n", ring->name));
                        ring->current_phase = ring->current_phase ?
                                0 : BCMPCIE_CMNHDR_PHASE_BIT_INIT;
                }
        }

        /* Update the write pointer in TCM & ring bell */
        if (alloced > 0) {
                if (ring == dhd->prot->h2dring_info_subn) {
                        prot->infobufpost += alloced;
                }
                dhd_prot_ring_write_complete(dhd, ring, msg_start, alloced);
        }

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return alloced;
} /* dhd_prot_infobufpost */

#ifdef IOCTLRESP_USE_CONSTMEM
static int
alloc_ioctl_return_buffer(dhd_pub_t *dhd, dhd_dma_buf_t *retbuf)
{
        int err;
        memset(retbuf, 0, sizeof(dhd_dma_buf_t));

        if ((err = dhd_dma_buf_alloc(dhd, retbuf, IOCT_RETBUF_SIZE)) != BCME_OK) {
                DHD_ERROR(("%s: dhd_dma_buf_alloc err %d\n", __FUNCTION__, err));
                ASSERT(0);
                return BCME_NOMEM;
        }

        return BCME_OK;
}

static void
free_ioctl_return_buffer(dhd_pub_t *dhd, dhd_dma_buf_t *retbuf)
{
        /* retbuf (declared on stack) not fully populated ...  */
        if (retbuf->va) {
                uint32 dma_pad;
                dma_pad = (IOCT_RETBUF_SIZE % DHD_DMA_PAD) ? DHD_DMA_PAD : 0;
                retbuf->len = IOCT_RETBUF_SIZE;
                retbuf->_alloced = retbuf->len + dma_pad;
        }

        dhd_dma_buf_free(dhd, retbuf);
        return;
}
#endif /* IOCTLRESP_USE_CONSTMEM */

static int
dhd_prot_rxbufpost_ctrl(dhd_pub_t *dhd, uint8 msg_type)
{
        void *p;
        uint16 pktsz;
        ioctl_resp_evt_buf_post_msg_t *rxbuf_post;
        dmaaddr_t pa;
        uint32 pktlen;
        dhd_prot_t *prot = dhd->prot;
        uint16 alloced = 0;
        unsigned long flags;
        dhd_dma_buf_t retbuf;
        void *dmah = NULL;
        uint32 pktid;
        void *map_handle;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;
        bool non_ioctl_resp_buf = 0;
        dhd_pkttype_t buf_type;

        if (dhd->busstate == DHD_BUS_DOWN) {
                DHD_ERROR(("%s: bus is already down.\n", __FUNCTION__));
                return -1;
        }
        memset(&retbuf, 0, sizeof(dhd_dma_buf_t));

        if (msg_type == MSG_TYPE_IOCTLRESP_BUF_POST)
                buf_type = PKTTYPE_IOCTL_RX;
        else if (msg_type == MSG_TYPE_EVENT_BUF_POST)
                buf_type = PKTTYPE_EVENT_RX;
        else if (msg_type == MSG_TYPE_TIMSTAMP_BUFPOST)
                buf_type = PKTTYPE_TSBUF_RX;
        else {
                DHD_ERROR(("invalid message type to be posted to Ctrl ring %d\n", msg_type));
                return -1;
        }

        if ((msg_type == MSG_TYPE_EVENT_BUF_POST) || (msg_type == MSG_TYPE_TIMSTAMP_BUFPOST))
                non_ioctl_resp_buf = TRUE;
        else
                non_ioctl_resp_buf = FALSE;

        if (non_ioctl_resp_buf) {
                /* Allocate packet for not ioctl resp buffer post */
                pktsz = DHD_FLOWRING_RX_BUFPOST_PKTSZ;
        } else {
                /* Allocate packet for ctrl/ioctl buffer post */
                pktsz = DHD_FLOWRING_IOCTL_BUFPOST_PKTSZ;
        }

#ifdef IOCTLRESP_USE_CONSTMEM
        if (!non_ioctl_resp_buf) {
                if (alloc_ioctl_return_buffer(dhd, &retbuf) != BCME_OK) {
                        DHD_ERROR(("Could not allocate IOCTL response buffer\n"));
                        return -1;
                }
                ASSERT(retbuf.len == IOCT_RETBUF_SIZE);
                p = retbuf.va;
                pktlen = retbuf.len;
                pa = retbuf.pa;
                dmah = retbuf.dmah;
        } else
#endif /* IOCTLRESP_USE_CONSTMEM */
        {
#ifdef DHD_USE_STATIC_CTRLBUF
                p = PKTGET_STATIC(dhd->osh, pktsz, FALSE);
#else
                p = PKTGET(dhd->osh, pktsz, FALSE);
#endif /* DHD_USE_STATIC_CTRLBUF */
                if (p == NULL) {
                        DHD_ERROR(("%s:%d: PKTGET for %s buf failed\n",
                                __FUNCTION__, __LINE__, non_ioctl_resp_buf ?
                                "EVENT" : "IOCTL RESP"));
                        dhd->rx_pktgetfail++;
                        return -1;
                }

                pktlen = PKTLEN(dhd->osh, p);

                if (SECURE_DMA_ENAB(dhd->osh)) {
                        pa = SECURE_DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen,
                                DMA_RX, p, 0, ring->dma_buf.secdma, 0);
                }
#ifndef BCM_SECURE_DMA
                else
                        pa = DMA_MAP(dhd->osh, PKTDATA(dhd->osh, p), pktlen, DMA_RX, p, 0);
#endif /* #ifndef BCM_SECURE_DMA */

                if (PHYSADDRISZERO(pa)) {
                        DHD_ERROR(("Invalid physaddr 0\n"));
                        ASSERT(0);
                        goto free_pkt_return;
                }

#ifdef DMAMAP_STATS
                switch (buf_type) {
#ifndef IOCTLRESP_USE_CONSTMEM
                        case PKTTYPE_IOCTL_RX:
                                dhd->dma_stats.ioctl_rx++;
                                dhd->dma_stats.ioctl_rx_sz += pktlen;
                                break;
#endif /* !IOCTLRESP_USE_CONSTMEM */
                        case PKTTYPE_EVENT_RX:
                                dhd->dma_stats.event_rx++;
                                dhd->dma_stats.event_rx_sz += pktlen;
                                break;
                        case PKTTYPE_TSBUF_RX:
                                dhd->dma_stats.tsbuf_rx++;
                                dhd->dma_stats.tsbuf_rx_sz += pktlen;
                                break;
                        default:
                                break;
                }
#endif /* DMAMAP_STATS */

        }

        /* grab the ring lock to allocate pktid and post on ring */
        DHD_RING_LOCK(ring->ring_lock, flags);

        rxbuf_post = (ioctl_resp_evt_buf_post_msg_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (rxbuf_post == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DHD_ERROR(("%s:%d: Ctrl submit Msgbuf Not available to post buffer \n",
                        __FUNCTION__, __LINE__));

#ifdef IOCTLRESP_USE_CONSTMEM
                if (non_ioctl_resp_buf)
#endif /* IOCTLRESP_USE_CONSTMEM */
                {
                        if (SECURE_DMA_ENAB(dhd->osh)) {
                                SECURE_DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL,
                                        ring->dma_buf.secdma, 0);
                        } else {
                                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL);
                        }
                }
                goto free_pkt_return;
        }

        /* CMN msg header */
        rxbuf_post->cmn_hdr.msg_type = msg_type;

#ifdef IOCTLRESP_USE_CONSTMEM
        if (!non_ioctl_resp_buf) {
                map_handle = dhd->prot->pktid_map_handle_ioctl;
                pktid = DHD_NATIVE_TO_PKTID(dhd, map_handle, p, pa, pktlen, DMA_RX, dmah,
                        ring->dma_buf.secdma, buf_type);
        } else
#endif /* IOCTLRESP_USE_CONSTMEM */
        {
                map_handle = dhd->prot->pktid_ctrl_map;
                pktid = DHD_NATIVE_TO_PKTID(dhd, map_handle,
                        p, pa, pktlen, DMA_RX, dmah, ring->dma_buf.secdma,
                        buf_type);
        }

        if (pktid == DHD_PKTID_INVALID) {
                if (ring->wr == 0) {
                        ring->wr = ring->max_items - 1;
                } else {
                        ring->wr--;
                        if (ring->wr == 0) {
                                ring->current_phase = ring->current_phase ? 0 :
                                        BCMPCIE_CMNHDR_PHASE_BIT_INIT;
                        }
                }
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL);
                DHD_ERROR_RLMT(("%s: Pktid pool depleted.\n", __FUNCTION__));
                goto free_pkt_return;
        }

#ifdef DHD_PKTID_AUDIT_RING
        DHD_PKTID_AUDIT(dhd, map_handle, pktid, DHD_DUPLICATE_ALLOC);
#endif /* DHD_PKTID_AUDIT_RING */

        rxbuf_post->cmn_hdr.request_id = htol32(pktid);
        rxbuf_post->cmn_hdr.if_id = 0;
        rxbuf_post->cmn_hdr.epoch =  ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;
        rxbuf_post->cmn_hdr.flags = ring->current_phase;

#if defined(DHD_PCIE_PKTID)
        if (rxbuf_post->cmn_hdr.request_id == DHD_PKTID_INVALID) {
                if (ring->wr == 0) {
                        ring->wr = ring->max_items - 1;
                } else {
                        if (ring->wr == 0) {
                                ring->current_phase = ring->current_phase ? 0 :
                                        BCMPCIE_CMNHDR_PHASE_BIT_INIT;
                        }
                }
                DHD_RING_UNLOCK(ring->ring_lock, flags);
#ifdef IOCTLRESP_USE_CONSTMEM
                if (non_ioctl_resp_buf)
#endif /* IOCTLRESP_USE_CONSTMEM */
                {
                        if (SECURE_DMA_ENAB(dhd->osh)) {
                                SECURE_DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL,
                                        ring->dma_buf.secdma, 0);
                        } else
                                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_RX, 0, DHD_DMAH_NULL);
                }
                goto free_pkt_return;
        }
#endif /* DHD_PCIE_PKTID */

#ifndef IOCTLRESP_USE_CONSTMEM
        rxbuf_post->host_buf_len = htol16((uint16)PKTLEN(dhd->osh, p));
#else
        rxbuf_post->host_buf_len = htol16((uint16)pktlen);
#endif /* IOCTLRESP_USE_CONSTMEM */
        rxbuf_post->host_buf_addr.high_addr = htol32(PHYSADDRHI(pa));
        rxbuf_post->host_buf_addr.low_addr  = htol32(PHYSADDRLO(pa));

#ifdef DHD_LBUF_AUDIT
        if (non_ioctl_resp_buf)
                PKTAUDIT(dhd->osh, p);
#endif // endif

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, rxbuf_post, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return 1;

free_pkt_return:
        if (!non_ioctl_resp_buf) {
#ifdef IOCTLRESP_USE_CONSTMEM
                free_ioctl_return_buffer(dhd, &retbuf);
#else
                dhd_prot_packet_free(dhd, p, buf_type, FALSE);
#endif /* IOCTLRESP_USE_CONSTMEM */
        } else {
                dhd_prot_packet_free(dhd, p, buf_type, FALSE);
        }

        return -1;
} /* dhd_prot_rxbufpost_ctrl */

static uint16
dhd_msgbuf_rxbuf_post_ctrlpath(dhd_pub_t *dhd, uint8 msg_type, uint32 max_to_post)
{
        uint32 i = 0;
        int32 ret_val;

        DHD_INFO(("max to post %d, event %d \n", max_to_post, msg_type));

        if (dhd->busstate == DHD_BUS_DOWN) {
                DHD_ERROR(("%s: bus is already down.\n", __FUNCTION__));
                return 0;
        }

        while (i < max_to_post) {
                ret_val  = dhd_prot_rxbufpost_ctrl(dhd, msg_type);
                if (ret_val < 0)
                        break;
                i++;
        }
        DHD_INFO(("posted %d buffers of type %d\n", i, msg_type));
        return (uint16)i;
}

static void
dhd_msgbuf_rxbuf_post_ioctlresp_bufs(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        int max_to_post;

        DHD_INFO(("ioctl resp buf post\n"));
        max_to_post = prot->max_ioctlrespbufpost - prot->cur_ioctlresp_bufs_posted;
        if (max_to_post <= 0) {
                DHD_INFO(("%s: Cannot post more than max IOCTL resp buffers\n",
                        __FUNCTION__));
                return;
        }
        prot->cur_ioctlresp_bufs_posted += dhd_msgbuf_rxbuf_post_ctrlpath(dhd,
                MSG_TYPE_IOCTLRESP_BUF_POST, max_to_post);
}

static void
dhd_msgbuf_rxbuf_post_event_bufs(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        int max_to_post;

        max_to_post = prot->max_eventbufpost - prot->cur_event_bufs_posted;
        if (max_to_post <= 0) {
                DHD_ERROR(("%s: Cannot post more than max event buffers\n",
                        __FUNCTION__));
                return;
        }
        prot->cur_event_bufs_posted += dhd_msgbuf_rxbuf_post_ctrlpath(dhd,
                MSG_TYPE_EVENT_BUF_POST, max_to_post);
}

static int
dhd_msgbuf_rxbuf_post_ts_bufs(dhd_pub_t *dhd)
{
        return 0;
}

bool BCMFASTPATH
dhd_prot_process_msgbuf_infocpl(dhd_pub_t *dhd, uint bound)
{
        dhd_prot_t *prot = dhd->prot;
        bool more = TRUE;
        uint n = 0;
        msgbuf_ring_t *ring = prot->d2hring_info_cpln;
        unsigned long flags;

        if (ring == NULL)
                return FALSE;
        if (ring->inited != TRUE)
                return FALSE;

        /* Process all the messages - DTOH direction */
        while (!dhd_is_device_removed(dhd)) {
                uint8 *msg_addr;
                uint32 msg_len;

                if (dhd->hang_was_sent) {
                        more = FALSE;
                        break;
                }

#ifdef DHD_MAP_LOGGING
                if (dhd->smmu_fault_occurred) {
                        more = FALSE;
                        break;
                }
#endif /* DHD_MAP_LOGGING */

                DHD_RING_LOCK(ring->ring_lock, flags);
                /* Get the message from ring */
                msg_addr = dhd_prot_get_read_addr(dhd, ring, &msg_len);
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                if (msg_addr == NULL) {
                        more = FALSE;
                        break;
                }

                /* Prefetch data to populate the cache */
                OSL_PREFETCH(msg_addr);

                if (dhd_prot_process_msgtype(dhd, ring, msg_addr, msg_len) != BCME_OK) {
                        DHD_ERROR(("%s: Error at  process rxpl msgbuf of len %d\n",
                                __FUNCTION__, msg_len));
                }

                /* Update read pointer */
                dhd_prot_upd_read_idx(dhd, ring);

                /* After batch processing, check RX bound */
                n += msg_len / ring->item_len;
                if (n >= bound) {
                        break;
                }
        }

        return more;
}

/** called when DHD needs to check for 'receive complete' messages from the dongle */
bool BCMFASTPATH
dhd_prot_process_msgbuf_rxcpl(dhd_pub_t *dhd, uint bound)
{
        bool more = FALSE;
        uint n = 0;
        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring = &prot->d2hring_rx_cpln;
        uint16 item_len = ring->item_len;
        host_rxbuf_cmpl_t *msg = NULL;
        uint8 *msg_addr;
        uint32 msg_len;
        uint16 pkt_cnt, pkt_cnt_newidx;
        unsigned long flags;
        dmaaddr_t pa;
        uint32 len;
        void *dmah;
        void *secdma;
        int ifidx = 0, if_newidx = 0;
        void *pkt, *pktqhead = NULL, *prevpkt = NULL, *pkt_newidx, *nextpkt;
        uint32 pktid;
        int i;
        uint8 sync;

        while (1) {
                if (dhd_is_device_removed(dhd))
                        break;

                if (dhd->hang_was_sent)
                        break;

#ifdef DHD_MAP_LOGGING
                if (dhd->smmu_fault_occurred) {
                        break;
                }
#endif /* DHD_MAP_LOGGING */

                pkt_cnt = 0;
                pktqhead = pkt_newidx = NULL;
                pkt_cnt_newidx = 0;

                DHD_RING_LOCK(ring->ring_lock, flags);

                /* Get the address of the next message to be read from ring */
                msg_addr = dhd_prot_get_read_addr(dhd, ring, &msg_len);
                if (msg_addr == NULL) {
                        DHD_RING_UNLOCK(ring->ring_lock, flags);
                        break;
                }

                while (msg_len > 0) {
                        msg = (host_rxbuf_cmpl_t *)msg_addr;

                        /* Wait until DMA completes, then fetch msg_type */
                        sync = prot->d2h_sync_cb(dhd, ring, &msg->cmn_hdr, item_len);
                        /*
                         * Update the curr_rd to the current index in the ring, from where
                         * the work item is fetched. This way if the fetched work item
                         * fails in LIVELOCK, we can print the exact read index in the ring
                         * that shows up the corrupted work item.
                         */
                        if ((ring->curr_rd + 1) >= ring->max_items) {
                                ring->curr_rd = 0;
                        } else {
                                ring->curr_rd += 1;
                        }

                        if (!sync) {
                                msg_len -= item_len;
                                msg_addr += item_len;
                                continue;
                        }

                        pktid = ltoh32(msg->cmn_hdr.request_id);

#ifdef DHD_PKTID_AUDIT_RING
                        DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_rx_map, pktid,
                                DHD_DUPLICATE_FREE, msg, D2HRING_RXCMPLT_ITEMSIZE);
#endif /* DHD_PKTID_AUDIT_RING */

                        pkt = DHD_PKTID_TO_NATIVE(dhd, prot->pktid_rx_map, pktid, pa,
                                len, dmah, secdma, PKTTYPE_DATA_RX);
                        if (!pkt) {
                                msg_len -= item_len;
                                msg_addr += item_len;
                                continue;
                        }

                        if (SECURE_DMA_ENAB(dhd->osh))
                                SECURE_DMA_UNMAP(dhd->osh, pa, (uint) len, DMA_RX, 0,
                                    dmah, secdma, 0);
                        else
                                DMA_UNMAP(dhd->osh, pa, (uint) len, DMA_RX, 0, dmah);

#ifdef DMAMAP_STATS
                        dhd->dma_stats.rxdata--;
                        dhd->dma_stats.rxdata_sz -= len;
#endif /* DMAMAP_STATS */
                        DHD_INFO(("id 0x%04x, offset %d, len %d, idx %d, phase 0x%02x, "
                                "pktdata %p, metalen %d\n",
                                ltoh32(msg->cmn_hdr.request_id),
                                ltoh16(msg->data_offset),
                                ltoh16(msg->data_len), msg->cmn_hdr.if_id,
                                msg->cmn_hdr.flags, PKTDATA(dhd->osh, pkt),
                                ltoh16(msg->metadata_len)));

                        pkt_cnt++;
                        msg_len -= item_len;
                        msg_addr += item_len;

#if DHD_DBG_SHOW_METADATA
                        if (prot->metadata_dbg && prot->rx_metadata_offset &&
                                msg->metadata_len) {
                                uchar *ptr;
                                ptr = PKTDATA(dhd->osh, pkt) - (prot->rx_metadata_offset);
                                /* header followed by data */
                                bcm_print_bytes("rxmetadata", ptr, msg->metadata_len);
                                dhd_prot_print_metadata(dhd, ptr, msg->metadata_len);
                        }
#endif /* DHD_DBG_SHOW_METADATA */

                        /* data_offset from buf start */
                        if (ltoh16(msg->data_offset)) {
                                /* data offset given from dongle after split rx */
                                PKTPULL(dhd->osh, pkt, ltoh16(msg->data_offset));
                        }
                        else if (prot->rx_dataoffset) {
                                /* DMA RX offset updated through shared area */
                                PKTPULL(dhd->osh, pkt, prot->rx_dataoffset);
                        }
                        /* Actual length of the packet */
                        PKTSETLEN(dhd->osh, pkt, ltoh16(msg->data_len));
#if defined(WL_MONITOR)
                        if (dhd_monitor_enabled(dhd, ifidx) &&
                                (msg->flags & BCMPCIE_PKT_FLAGS_FRAME_802_11)) {
                                dhd_rx_mon_pkt(dhd, msg, pkt, ifidx);
                                continue;
                        }
#endif // endif

                        if (!pktqhead) {
                                pktqhead = prevpkt = pkt;
                                ifidx = msg->cmn_hdr.if_id;
                        } else {
                                if (ifidx != msg->cmn_hdr.if_id) {
                                        pkt_newidx = pkt;
                                        if_newidx = msg->cmn_hdr.if_id;
                                        pkt_cnt--;
                                        pkt_cnt_newidx = 1;
                                        break;
                                } else {
                                        PKTSETNEXT(dhd->osh, prevpkt, pkt);
                                        prevpkt = pkt;
                                }
                        }

#ifdef DHD_LBUF_AUDIT
                        PKTAUDIT(dhd->osh, pkt);
#endif // endif
                }

                /* roll back read pointer for unprocessed message */
                if (msg_len > 0) {
                        if (ring->rd < msg_len / item_len)
                                ring->rd = ring->max_items - msg_len / item_len;
                        else
                                ring->rd -= msg_len / item_len;
                }

                /* Update read pointer */
                dhd_prot_upd_read_idx(dhd, ring);

                DHD_RING_UNLOCK(ring->ring_lock, flags);

                pkt = pktqhead;
                for (i = 0; pkt && i < pkt_cnt; i++, pkt = nextpkt) {
                        nextpkt = PKTNEXT(dhd->osh, pkt);
                        PKTSETNEXT(dhd->osh, pkt, NULL);
#ifdef DHD_LB_RXP
                        dhd_lb_rx_pkt_enqueue(dhd, pkt, ifidx);
#elif defined(DHD_RX_CHAINING)
                        dhd_rxchain_frame(dhd, pkt, ifidx);
#else
                        dhd_bus_rx_frame(dhd->bus, pkt, ifidx, 1);
#endif /* DHD_LB_RXP */
                }

                if (pkt_newidx) {
#ifdef DHD_LB_RXP
                        dhd_lb_rx_pkt_enqueue(dhd, pkt_newidx, if_newidx);
#elif defined(DHD_RX_CHAINING)
                        dhd_rxchain_frame(dhd, pkt_newidx, if_newidx);
#else
                        dhd_bus_rx_frame(dhd->bus, pkt_newidx, if_newidx, 1);
#endif /* DHD_LB_RXP */
                }

                pkt_cnt += pkt_cnt_newidx;

                /* Post another set of rxbufs to the device */
                dhd_prot_return_rxbuf(dhd, 0, pkt_cnt);

#ifdef DHD_RX_CHAINING
                dhd_rxchain_commit(dhd);
#endif // endif

                /* After batch processing, check RX bound */
                n += pkt_cnt;
                if (n >= bound) {
                        more = TRUE;
                        break;
                }
        }

        /* Call lb_dispatch only if packets are queued */
        if (n) {
                DHD_LB_DISPATCH_RX_COMPL(dhd);
                DHD_LB_DISPATCH_RX_PROCESS(dhd);
        }

        return more;
}

/**
 * Hands transmit packets (with a caller provided flow_id) over to dongle territory (the flow ring)
 */
void
dhd_prot_update_txflowring(dhd_pub_t *dhd, uint16 flowid, void *msgring)
{
        msgbuf_ring_t *ring = (msgbuf_ring_t *)msgring;

        if (ring == NULL) {
                DHD_ERROR(("%s: NULL txflowring. exiting...\n",  __FUNCTION__));
                return;
        }
        /* Update read pointer */
        if (dhd->dma_d2h_ring_upd_support) {
                ring->rd = dhd_prot_dma_indx_get(dhd, H2D_DMA_INDX_RD_UPD, ring->idx);
        }

        DHD_TRACE(("ringid %d flowid %d write %d read %d \n\n",
                ring->idx, flowid, ring->wr, ring->rd));

        /* Need more logic here, but for now use it directly */
        dhd_bus_schedule_queue(dhd->bus, flowid, TRUE); /* from queue to flowring */
}

/** called when DHD needs to check for 'transmit complete' messages from the dongle */
bool BCMFASTPATH
dhd_prot_process_msgbuf_txcpl(dhd_pub_t *dhd, uint bound)
{
        bool more = TRUE;
        uint n = 0;
        msgbuf_ring_t *ring = &dhd->prot->d2hring_tx_cpln;
        unsigned long flags;

        /* Process all the messages - DTOH direction */
        while (!dhd_is_device_removed(dhd)) {
                uint8 *msg_addr;
                uint32 msg_len;

                if (dhd->hang_was_sent) {
                        more = FALSE;
                        break;
                }

#ifdef DHD_MAP_LOGGING
                if (dhd->smmu_fault_occurred) {
                        more = FALSE;
                        break;
                }
#endif /* DHD_MAP_LOGGING */

                DHD_RING_LOCK(ring->ring_lock, flags);
                /* Get the address of the next message to be read from ring */
                msg_addr = dhd_prot_get_read_addr(dhd, ring, &msg_len);
                DHD_RING_UNLOCK(ring->ring_lock, flags);

                if (msg_addr == NULL) {
                        more = FALSE;
                        break;
                }

                /* Prefetch data to populate the cache */
                OSL_PREFETCH(msg_addr);

                if (dhd_prot_process_msgtype(dhd, ring, msg_addr, msg_len) != BCME_OK) {
                        DHD_ERROR(("%s: process %s msg addr %p len %d\n",
                                __FUNCTION__, ring->name, msg_addr, msg_len));
                }

                /* Write to dngl rd ptr */
                dhd_prot_upd_read_idx(dhd, ring);

                /* After batch processing, check bound */
                n += msg_len / ring->item_len;
                if (n >= bound) {
                        break;
                }
        }

        DHD_LB_DISPATCH_TX_COMPL(dhd);

        return more;
}

int BCMFASTPATH
dhd_prot_process_trapbuf(dhd_pub_t *dhd)
{
        uint32 data;
        dhd_dma_buf_t *trap_addr = &dhd->prot->fw_trap_buf;

        /* Interrupts can come in before this struct
         *  has been initialized.
         */
        if (trap_addr->va == NULL) {
                DHD_ERROR(("%s: trap_addr->va is NULL\n", __FUNCTION__));
                return 0;
        }

        OSL_CACHE_INV((void *)trap_addr->va, sizeof(uint32));
        data = *(uint32 *)(trap_addr->va);

        if (data & D2H_DEV_FWHALT) {
                DHD_ERROR(("Firmware trapped and trap_data is 0x%04x\n", data));

                if (data & D2H_DEV_EXT_TRAP_DATA)
                {
                        if (dhd->extended_trap_data) {
                                OSL_CACHE_INV((void *)trap_addr->va,
                                       BCMPCIE_EXT_TRAP_DATA_MAXLEN);
                                memcpy(dhd->extended_trap_data, (uint32 *)trap_addr->va,
                                       BCMPCIE_EXT_TRAP_DATA_MAXLEN);
                        }
                        DHD_ERROR(("Extended trap data available\n"));
                }
                return data;
        }
        return 0;
}

/** called when DHD needs to check for 'ioctl complete' messages from the dongle */
int BCMFASTPATH
dhd_prot_process_ctrlbuf(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring = &prot->d2hring_ctrl_cpln;
        unsigned long flags;

        /* Process all the messages - DTOH direction */
        while (!dhd_is_device_removed(dhd)) {
                uint8 *msg_addr;
                uint32 msg_len;

                if (dhd->hang_was_sent) {
                        break;
                }

#ifdef DHD_MAP_LOGGING
                if (dhd->smmu_fault_occurred) {
                        break;
                }
#endif /* DHD_MAP_LOGGING */

                DHD_RING_LOCK(ring->ring_lock, flags);
                /* Get the address of the next message to be read from ring */
                msg_addr = dhd_prot_get_read_addr(dhd, ring, &msg_len);
                DHD_RING_UNLOCK(ring->ring_lock, flags);

                if (msg_addr == NULL) {
                        break;
                }

                /* Prefetch data to populate the cache */
                OSL_PREFETCH(msg_addr);
                if (dhd_prot_process_msgtype(dhd, ring, msg_addr, msg_len) != BCME_OK) {
                        DHD_ERROR(("%s: process %s msg addr %p len %d\n",
                                __FUNCTION__, ring->name, msg_addr, msg_len));
                }

                /* Write to dngl rd ptr */
                dhd_prot_upd_read_idx(dhd, ring);
        }

        return 0;
}

/**
 * Consume messages out of the D2H ring. Ensure that the message's DMA to host
 * memory has completed, before invoking the message handler via a table lookup
 * of the cmn_msg_hdr::msg_type.
 */
static int BCMFASTPATH
dhd_prot_process_msgtype(dhd_pub_t *dhd, msgbuf_ring_t *ring, uint8 *buf, uint32 len)
{
        uint32 buf_len = len;
        uint16 item_len;
        uint8 msg_type;
        cmn_msg_hdr_t *msg = NULL;
        int ret = BCME_OK;

        ASSERT(ring);
        item_len = ring->item_len;
        if (item_len == 0) {
                DHD_ERROR(("%s: ringidx %d, item_len %d buf_len %d \n",
                        __FUNCTION__, ring->idx, item_len, buf_len));
                return BCME_ERROR;
        }

        while (buf_len > 0) {
                if (dhd->hang_was_sent) {
                        ret = BCME_ERROR;
                        goto done;
                }

#ifdef DHD_MAP_LOGGING
                if (dhd->smmu_fault_occurred) {
                        ret = BCME_ERROR;
                        goto done;
                }
#endif /* DHD_MAP_LOGGING */

                msg = (cmn_msg_hdr_t *)buf;

                /* Wait until DMA completes, then fetch msg_type */
                msg_type = dhd->prot->d2h_sync_cb(dhd, ring, msg, item_len);

                /*
                 * Update the curr_rd to the current index in the ring, from where
                 * the work item is fetched. This way if the fetched work item
                 * fails in LIVELOCK, we can print the exact read index in the ring
                 * that shows up the corrupted work item.
                 */
                if ((ring->curr_rd + 1) >= ring->max_items) {
                        ring->curr_rd = 0;
                } else {
                        ring->curr_rd += 1;
                }

                /* Prefetch data to populate the cache */
                OSL_PREFETCH(buf + item_len);

                DHD_INFO(("msg_type %d item_len %d buf_len %d\n",
                        msg_type, item_len, buf_len));

                if (msg_type == MSG_TYPE_LOOPBACK) {
                        bcm_print_bytes("LPBK RESP: ", (uint8 *)msg, item_len);
                        DHD_ERROR((" MSG_TYPE_LOOPBACK, len %d\n", item_len));
                }

                ASSERT(msg_type < DHD_PROT_FUNCS);
                if (msg_type >= DHD_PROT_FUNCS) {
                        DHD_ERROR(("%s: msg_type %d, item_len %d buf_len %d\n",
                                __FUNCTION__, msg_type, item_len, buf_len));
                        ret = BCME_ERROR;
                        goto done;
                }

                if (msg_type == MSG_TYPE_INFO_BUF_CMPLT) {
                        if (ring == dhd->prot->d2hring_info_cpln) {
                                if (!dhd->prot->infobufpost) {
                                        DHD_ERROR(("infobuf posted are zero,"
                                                   "but there is a completion\n"));
                                        goto done;
                                }
                                dhd->prot->infobufpost--;
                                dhd_prot_infobufpost(dhd, dhd->prot->h2dring_info_subn);
                                dhd_prot_process_infobuf_complete(dhd, buf);
                        }
                } else
                if (table_lookup[msg_type]) {
                        table_lookup[msg_type](dhd, buf);
                }

                if (buf_len < item_len) {
                        ret = BCME_ERROR;
                        goto done;
                }
                buf_len = buf_len - item_len;
                buf = buf + item_len;
        }

done:

#ifdef DHD_RX_CHAINING
        dhd_rxchain_commit(dhd);
#endif // endif

        return ret;
} /* dhd_prot_process_msgtype */

static void
dhd_prot_noop(dhd_pub_t *dhd, void *msg)
{
        return;
}

/** called on MSG_TYPE_RING_STATUS message received from dongle */
static void
dhd_prot_ringstatus_process(dhd_pub_t *dhd, void *msg)
{
        pcie_ring_status_t *ring_status = (pcie_ring_status_t *) msg;
        uint32 request_id = ltoh32(ring_status->cmn_hdr.request_id);
        uint16 status = ltoh16(ring_status->compl_hdr.status);
        uint16 ring_id = ltoh16(ring_status->compl_hdr.flow_ring_id);

        DHD_ERROR(("ring status: request_id %d, status 0x%04x, flow ring %d, write_idx %d \n",
                request_id, status, ring_id, ltoh16(ring_status->write_idx)));

        if (ltoh16(ring_status->compl_hdr.ring_id) != BCMPCIE_H2D_MSGRING_CONTROL_SUBMIT)
                return;
        if (status == BCMPCIE_BAD_PHASE) {
                /* bad phase report from */
                DHD_ERROR(("Bad phase\n"));
        }
        if (status != BCMPCIE_BADOPTION)
                return;

        if (request_id == DHD_H2D_DBGRING_REQ_PKTID) {
                if (dhd->prot->h2dring_info_subn != NULL) {
                        if (dhd->prot->h2dring_info_subn->create_pending == TRUE) {
                                DHD_ERROR(("H2D ring create failed for info ring\n"));
                                dhd->prot->h2dring_info_subn->create_pending = FALSE;
                        }
                        else
                                DHD_ERROR(("ring create ID for a ring, create not pending\n"));
                } else {
                        DHD_ERROR(("%s info submit ring doesn't exist\n", __FUNCTION__));
                }
        }
        else if (request_id == DHD_D2H_DBGRING_REQ_PKTID) {
                if (dhd->prot->d2hring_info_cpln != NULL) {
                        if (dhd->prot->d2hring_info_cpln->create_pending == TRUE) {
                                DHD_ERROR(("D2H ring create failed for info ring\n"));
                                dhd->prot->d2hring_info_cpln->create_pending = FALSE;
                        }
                        else
                                DHD_ERROR(("ring create ID for info ring, create not pending\n"));
                } else {
                        DHD_ERROR(("%s info cpl ring doesn't exist\n", __FUNCTION__));
                }
        }
        else {
                DHD_ERROR(("don;t know how to pair with original request\n"));
        }
        /* How do we track this to pair it with ??? */
        return;
}

/** called on MSG_TYPE_GEN_STATUS ('general status') message received from dongle */
static void
dhd_prot_genstatus_process(dhd_pub_t *dhd, void *msg)
{
        pcie_gen_status_t *gen_status = (pcie_gen_status_t *)msg;
        DHD_ERROR(("ERROR: gen status: request_id %d, STATUS 0x%04x, flow ring %d \n",
                gen_status->cmn_hdr.request_id, gen_status->compl_hdr.status,
                gen_status->compl_hdr.flow_ring_id));

        /* How do we track this to pair it with ??? */
        return;
}

/**
 * Called on MSG_TYPE_IOCTLPTR_REQ_ACK ('ioctl ack') message received from dongle, meaning that the
 * dongle received the ioctl message in dongle memory.
 */
static void
dhd_prot_ioctack_process(dhd_pub_t *dhd, void *msg)
{
        ioctl_req_ack_msg_t *ioct_ack = (ioctl_req_ack_msg_t *)msg;
        unsigned long flags;
#if defined(DHD_PKTID_AUDIT_RING)
        uint32 pktid = ltoh32(ioct_ack->cmn_hdr.request_id);
#endif // endif

#if defined(DHD_PKTID_AUDIT_RING)
        /* Skip audit for ADHD_IOCTL_REQ_PKTID = 0xFFFE */
        if (pktid != DHD_IOCTL_REQ_PKTID) {
#ifndef IOCTLRESP_USE_CONSTMEM
                DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_ctrl_map, pktid,
                        DHD_TEST_IS_ALLOC, msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
#else
                DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_map_handle_ioctl, pktid,
                        DHD_TEST_IS_ALLOC, msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
#endif /* !IOCTLRESP_USE_CONSTMEM */
        }
#endif // endif

        dhd->prot->ioctl_ack_time = OSL_LOCALTIME_NS();

        DHD_GENERAL_LOCK(dhd, flags);
        if ((dhd->prot->ioctl_state & MSGBUF_IOCTL_ACK_PENDING) &&
                (dhd->prot->ioctl_state & MSGBUF_IOCTL_RESP_PENDING)) {
                dhd->prot->ioctl_state &= ~MSGBUF_IOCTL_ACK_PENDING;
        } else {
                DHD_ERROR(("%s: received ioctl ACK with state %02x trans_id = %d\n",
                        __FUNCTION__, dhd->prot->ioctl_state, dhd->prot->ioctl_trans_id));
                prhex("dhd_prot_ioctack_process:",
                        (uchar *)msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
        }
        DHD_GENERAL_UNLOCK(dhd, flags);

        DHD_CTL(("ioctl req ack: request_id %d, status 0x%04x, flow ring %d \n",
                ioct_ack->cmn_hdr.request_id, ioct_ack->compl_hdr.status,
                ioct_ack->compl_hdr.flow_ring_id));
        if (ioct_ack->compl_hdr.status != 0)  {
                DHD_ERROR(("got an error status for the ioctl request...need to handle that\n"));
        }
}

/** called on MSG_TYPE_IOCTL_CMPLT message received from dongle */
static void
dhd_prot_ioctcmplt_process(dhd_pub_t *dhd, void *msg)
{
        dhd_prot_t *prot = dhd->prot;
        uint32 pkt_id, xt_id;
        ioctl_comp_resp_msg_t *ioct_resp = (ioctl_comp_resp_msg_t *)msg;
        void *pkt;
        unsigned long flags;
        dhd_dma_buf_t retbuf;

        memset(&retbuf, 0, sizeof(dhd_dma_buf_t));

        pkt_id = ltoh32(ioct_resp->cmn_hdr.request_id);

#if defined(DHD_PKTID_AUDIT_RING)
#ifndef IOCTLRESP_USE_CONSTMEM
        DHD_PKTID_AUDIT_RING_DEBUG(dhd, prot->pktid_ctrl_map, pkt_id,
                DHD_DUPLICATE_FREE, msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
#else
        DHD_PKTID_AUDIT_RING_DEBUG(dhd, prot->pktid_map_handle_ioctl, pkt_id,
                DHD_DUPLICATE_FREE, msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
#endif /* !IOCTLRESP_USE_CONSTMEM */
#endif // endif

        DHD_GENERAL_LOCK(dhd, flags);
        if ((prot->ioctl_state & MSGBUF_IOCTL_ACK_PENDING) ||
                !(prot->ioctl_state & MSGBUF_IOCTL_RESP_PENDING)) {
                DHD_ERROR(("%s: received ioctl response with state %02x trans_id = %d\n",
                        __FUNCTION__, dhd->prot->ioctl_state, dhd->prot->ioctl_trans_id));
                prhex("dhd_prot_ioctcmplt_process:",
                        (uchar *)msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
                DHD_GENERAL_UNLOCK(dhd, flags);
                return;
        }

        dhd->prot->ioctl_cmplt_time = OSL_LOCALTIME_NS();

        /* Clear Response pending bit */
        prot->ioctl_state &= ~MSGBUF_IOCTL_RESP_PENDING;
        DHD_GENERAL_UNLOCK(dhd, flags);

#ifndef IOCTLRESP_USE_CONSTMEM
        pkt = dhd_prot_packet_get(dhd, pkt_id, PKTTYPE_IOCTL_RX, TRUE);
#else
        dhd_prot_ioctl_ret_buffer_get(dhd, pkt_id, &retbuf);
        pkt = retbuf.va;
#endif /* !IOCTLRESP_USE_CONSTMEM */
        if (!pkt) {
                DHD_ERROR(("%s: received ioctl response with NULL pkt\n", __FUNCTION__));
                prhex("dhd_prot_ioctcmplt_process:",
                        (uchar *)msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
                return;
        }

        prot->ioctl_resplen = ltoh16(ioct_resp->resp_len);
        prot->ioctl_status = ltoh16(ioct_resp->compl_hdr.status);
        xt_id = ltoh16(ioct_resp->trans_id);

        if (xt_id != prot->ioctl_trans_id || prot->curr_ioctl_cmd != ioct_resp->cmd) {
                DHD_ERROR(("%s: transaction id(%d %d) or cmd(%d %d) mismatch\n",
                        __FUNCTION__, xt_id, prot->ioctl_trans_id,
                        prot->curr_ioctl_cmd, ioct_resp->cmd));
                dhd_wakeup_ioctl_event(dhd, IOCTL_RETURN_ON_ERROR);
                dhd_prot_debug_info_print(dhd);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_TRANS_ID_MISMATCH;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                dhd_schedule_reset(dhd);
                goto exit;
        }
        DHD_CTL(("IOCTL_COMPLETE: req_id %x transid %d status %x resplen %d\n",
                pkt_id, xt_id, prot->ioctl_status, prot->ioctl_resplen));

        if (prot->ioctl_resplen > 0) {
#ifndef IOCTLRESP_USE_CONSTMEM
                bcopy(PKTDATA(dhd->osh, pkt), prot->retbuf.va, prot->ioctl_resplen);
#else
                bcopy(pkt, prot->retbuf.va, prot->ioctl_resplen);
#endif /* !IOCTLRESP_USE_CONSTMEM */
        }

        /* wake up any dhd_os_ioctl_resp_wait() */
        dhd_wakeup_ioctl_event(dhd, IOCTL_RETURN_ON_SUCCESS);

exit:
#ifndef IOCTLRESP_USE_CONSTMEM
        dhd_prot_packet_free(dhd, pkt,
                PKTTYPE_IOCTL_RX, FALSE);
#else
        free_ioctl_return_buffer(dhd, &retbuf);
#endif /* !IOCTLRESP_USE_CONSTMEM */

        /* Post another ioctl buf to the device */
        if (prot->cur_ioctlresp_bufs_posted > 0) {
                prot->cur_ioctlresp_bufs_posted--;
        }

        dhd_msgbuf_rxbuf_post_ioctlresp_bufs(dhd);
}

/** called on MSG_TYPE_TX_STATUS message received from dongle */
static void BCMFASTPATH
dhd_prot_txstatus_process(dhd_pub_t *dhd, void *msg)
{
        dhd_prot_t *prot = dhd->prot;
        host_txbuf_cmpl_t * txstatus;
        unsigned long flags;
        uint32 pktid;
        void *pkt;
        dmaaddr_t pa;
        uint32 len;
        void *dmah;
        void *secdma;
        bool pkt_fate;
        msgbuf_ring_t *ring = &dhd->prot->d2hring_tx_cpln;
#ifdef TX_STATUS_LATENCY_STATS
        flow_info_t *flow_info;
        uint64 tx_status_latency;
#endif /* TX_STATUS_LATENCY_STATS */
#if defined(TX_STATUS_LATENCY_STATS)
        flow_ring_node_t *flow_ring_node;
        uint16 flowid;
#endif // endif

        txstatus = (host_txbuf_cmpl_t *)msg;
#if defined(TX_STATUS_LATENCY_STATS)
        flowid = txstatus->compl_hdr.flow_ring_id;
        flow_ring_node = DHD_FLOW_RING(dhd, flowid);
#endif // endif

        /* locks required to protect circular buffer accesses */
        DHD_RING_LOCK(ring->ring_lock, flags);
        pktid = ltoh32(txstatus->cmn_hdr.request_id);
        pkt_fate = TRUE;

#if defined(DHD_PKTID_AUDIT_RING)
        DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_tx_map, pktid,
                        DHD_DUPLICATE_FREE, msg, D2HRING_TXCMPLT_ITEMSIZE);
#endif // endif

        DHD_INFO(("txstatus for pktid 0x%04x\n", pktid));
        if (OSL_ATOMIC_DEC_RETURN(dhd->osh, &prot->active_tx_count) < 0) {
                DHD_ERROR(("Extra packets are freed\n"));
        }
        ASSERT(pktid != 0);

        pkt = DHD_PKTID_TO_NATIVE(dhd, dhd->prot->pktid_tx_map, pktid,
                pa, len, dmah, secdma, PKTTYPE_DATA_TX);
        if (!pkt) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DHD_ERROR(("%s: received txstatus with NULL pkt\n", __FUNCTION__));
                prhex("dhd_prot_txstatus_process:", (uchar *)msg, D2HRING_TXCMPLT_ITEMSIZE);
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_PKTID_INVALID;
                        dhd_bus_mem_dump(dhd);
                }
#else
                ASSERT(0);
#endif /* DHD_FW_COREDUMP */
                return;
        }

        if (SECURE_DMA_ENAB(dhd->osh)) {
                int offset = 0;
                BCM_REFERENCE(offset);

                if (dhd->prot->tx_metadata_offset)
                        offset = dhd->prot->tx_metadata_offset + ETHER_HDR_LEN;
                SECURE_DMA_UNMAP(dhd->osh, (uint) pa,
                        (uint) dhd->prot->tx_metadata_offset, DMA_RX, 0, dmah,
                        secdma, offset);
        } else {
                DMA_UNMAP(dhd->osh, pa, (uint) len, DMA_RX, 0, dmah);
        }

#ifdef TX_STATUS_LATENCY_STATS
        /* update the tx status latency for flowid */
        flow_info = &flow_ring_node->flow_info;
        tx_status_latency = OSL_SYSUPTIME_US() - DHD_PKT_GET_QTIME(pkt);
        flow_info->cum_tx_status_latency += tx_status_latency;
        flow_info->num_tx_status++;
#endif /* TX_STATUS_LATENCY_STATS */
#if defined(DHD_LB_TXC) && !defined(BCM_SECURE_DMA)
        {
                int elem_ix;
                void **elem;
                bcm_workq_t *workq;

                workq = &prot->tx_compl_prod;
                /*
                 * Produce the packet into the tx_compl workq for the tx compl tasklet
                 * to consume.
                 */
                OSL_PREFETCH(PKTTAG(pkt));

                /* fetch next available slot in workq */
                elem_ix = bcm_ring_prod(WORKQ_RING(workq), DHD_LB_WORKQ_SZ);

                DHD_PKTTAG_SET_PA((dhd_pkttag_fr_t *)PKTTAG(pkt), pa);
                DHD_PKTTAG_SET_PA_LEN((dhd_pkttag_fr_t *)PKTTAG(pkt), len);

                if (elem_ix == BCM_RING_FULL) {
                        DHD_ERROR(("tx_compl_prod BCM_RING_FULL\n"));
                        goto workq_ring_full;
                }

                elem = WORKQ_ELEMENT(void *, &prot->tx_compl_prod, elem_ix);
                *elem = pkt;

                smp_wmb();

                /* Sync WR index to consumer if the SYNC threshold has been reached */
                if (++prot->tx_compl_prod_sync >= DHD_LB_WORKQ_SYNC) {
                        bcm_workq_prod_sync(workq);
                        prot->tx_compl_prod_sync = 0;
                }

                DHD_INFO(("%s: tx_compl_prod pkt<%p> sync<%d>\n",
                        __FUNCTION__, pkt, prot->tx_compl_prod_sync));

                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return;
        }

workq_ring_full:

#endif /* !DHD_LB_TXC */

#ifdef DMAMAP_STATS
        dhd->dma_stats.txdata--;
        dhd->dma_stats.txdata_sz -= len;
#endif /* DMAMAP_STATS */
        pkt_fate = dhd_dbg_process_tx_status(dhd, pkt, pktid,
                        ltoh16(txstatus->compl_hdr.status) & WLFC_CTL_PKTFLAG_MASK);
#ifdef DHD_PKT_LOGGING
        if (dhd->d11_tx_status) {
                DHD_PKTLOG_TXS(dhd, pkt, pktid,
                        ltoh16(txstatus->compl_hdr.status) & WLFC_CTL_PKTFLAG_MASK);
        }
#endif /* DHD_PKT_LOGGING */
#if defined(BCMPCIE)
        dhd_txcomplete(dhd, pkt, pkt_fate);
#endif // endif

#if DHD_DBG_SHOW_METADATA
        if (dhd->prot->metadata_dbg &&
                dhd->prot->tx_metadata_offset && txstatus->metadata_len) {
                uchar *ptr;
                /* The Ethernet header of TX frame was copied and removed.
                 * Here, move the data pointer forward by Ethernet header size.
                 */
                PKTPULL(dhd->osh, pkt, ETHER_HDR_LEN);
                ptr = PKTDATA(dhd->osh, pkt)  - (dhd->prot->tx_metadata_offset);
                bcm_print_bytes("txmetadata", ptr, txstatus->metadata_len);
                dhd_prot_print_metadata(dhd, ptr, txstatus->metadata_len);
        }
#endif /* DHD_DBG_SHOW_METADATA */

#ifdef DHD_LBUF_AUDIT
        PKTAUDIT(dhd->osh, pkt);
#endif // endif

        DHD_RING_UNLOCK(ring->ring_lock, flags);
        PKTFREE(dhd->osh, pkt, TRUE);
        DHD_RING_LOCK(ring->ring_lock, flags);
        DHD_FLOWRING_TXSTATUS_CNT_UPDATE(dhd->bus, txstatus->compl_hdr.flow_ring_id,
                txstatus->tx_status);
        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return;
} /* dhd_prot_txstatus_process */

/** called on MSG_TYPE_WL_EVENT message received from dongle */
static void
dhd_prot_event_process(dhd_pub_t *dhd, void *msg)
{
        wlevent_req_msg_t *evnt;
        uint32 bufid;
        uint16 buflen;
        int ifidx = 0;
        void* pkt;
        dhd_prot_t *prot = dhd->prot;

        /* Event complete header */
        evnt = (wlevent_req_msg_t *)msg;
        bufid = ltoh32(evnt->cmn_hdr.request_id);

#if defined(DHD_PKTID_AUDIT_RING)
        DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_ctrl_map, bufid,
                        DHD_DUPLICATE_FREE, msg, D2HRING_CTRL_CMPLT_ITEMSIZE);
#endif // endif

        buflen = ltoh16(evnt->event_data_len);

        ifidx = BCMMSGBUF_API_IFIDX(&evnt->cmn_hdr);

        /* Post another rxbuf to the device */
        if (prot->cur_event_bufs_posted)
                prot->cur_event_bufs_posted--;
        dhd_msgbuf_rxbuf_post_event_bufs(dhd);

        pkt = dhd_prot_packet_get(dhd, bufid, PKTTYPE_EVENT_RX, TRUE);

        if (!pkt) {
                DHD_ERROR(("%s: pkt is NULL for pktid %d\n", __FUNCTION__, bufid));
                return;
        }

        /* DMA RX offset updated through shared area */
        if (dhd->prot->rx_dataoffset)
                PKTPULL(dhd->osh, pkt, dhd->prot->rx_dataoffset);

        PKTSETLEN(dhd->osh, pkt, buflen);
#ifdef DHD_LBUF_AUDIT
        PKTAUDIT(dhd->osh, pkt);
#endif // endif
        dhd_bus_rx_frame(dhd->bus, pkt, ifidx, 1);
}

/** called on MSG_TYPE_INFO_BUF_CMPLT message received from dongle */
static void BCMFASTPATH
dhd_prot_process_infobuf_complete(dhd_pub_t *dhd, void* buf)
{
        info_buf_resp_t *resp;
        uint32 pktid;
        uint16 buflen;
        void * pkt;

        resp = (info_buf_resp_t *)buf;
        pktid = ltoh32(resp->cmn_hdr.request_id);
        buflen = ltoh16(resp->info_data_len);

#ifdef DHD_PKTID_AUDIT_RING
        DHD_PKTID_AUDIT_RING_DEBUG(dhd, dhd->prot->pktid_ctrl_map, pktid,
                        DHD_DUPLICATE_FREE, buf, D2HRING_INFO_BUFCMPLT_ITEMSIZE);
#endif /* DHD_PKTID_AUDIT_RING */

        DHD_INFO(("id 0x%04x, len %d, phase 0x%02x, seqnum %d, rx_dataoffset %d\n",
                pktid, buflen, resp->cmn_hdr.flags, ltoh16(resp->seqnum),
                dhd->prot->rx_dataoffset));

        pkt = dhd_prot_packet_get(dhd, pktid, PKTTYPE_INFO_RX, TRUE);
        if (!pkt)
                return;

        /* DMA RX offset updated through shared area */
        if (dhd->prot->rx_dataoffset)
                PKTPULL(dhd->osh, pkt, dhd->prot->rx_dataoffset);

        PKTSETLEN(dhd->osh, pkt, buflen);

#ifdef DHD_LBUF_AUDIT
        PKTAUDIT(dhd->osh, pkt);
#endif // endif

        /* info ring "debug" data, which is not a 802.3 frame, is sent/hacked with a
         * special ifidx of -1.  This is just internal to dhd to get the data to
         * dhd_linux.c:dhd_rx_frame() from here (dhd_prot_infobuf_cmplt_process).
         */
        dhd_bus_rx_frame(dhd->bus, pkt, DHD_DUMMY_INFO_IF /* ifidx HACK */, 1);
}

/** called on MSG_TYPE_SNAPSHOT_CMPLT message received from dongle */
static void BCMFASTPATH
dhd_prot_process_snapshot_complete(dhd_pub_t *dhd, void *buf)
{
}

/** Stop protocol: sync w/dongle state. */
void dhd_prot_stop(dhd_pub_t *dhd)
{
        ASSERT(dhd);
        DHD_TRACE(("%s: Enter\n", __FUNCTION__));

}

/* Add any protocol-specific data header.
 * Caller must reserve prot_hdrlen prepend space.
 */
void BCMFASTPATH
dhd_prot_hdrpush(dhd_pub_t *dhd, int ifidx, void *PKTBUF)
{
        return;
}

uint
dhd_prot_hdrlen(dhd_pub_t *dhd, void *PKTBUF)
{
        return 0;
}

#define MAX_MTU_SZ (1600u)

#define PKTBUF pktbuf

/**
 * Called when a tx ethernet packet has been dequeued from a flow queue, and has to be inserted in
 * the corresponding flow ring.
 */
int BCMFASTPATH
dhd_prot_txdata(dhd_pub_t *dhd, void *PKTBUF, uint8 ifidx)
{
        unsigned long flags;
        dhd_prot_t *prot = dhd->prot;
        host_txbuf_post_t *txdesc = NULL;
        dmaaddr_t pa, meta_pa;
        uint8 *pktdata;
        uint32 pktlen;
        uint32 pktid;
        uint8   prio;
        uint16 flowid = 0;
        uint16 alloced = 0;
        uint16  headroom;
        msgbuf_ring_t *ring;
        flow_ring_table_t *flow_ring_table;
        flow_ring_node_t *flow_ring_node;

        if (dhd->flow_ring_table == NULL) {
                return BCME_NORESOURCE;
        }

        flowid = DHD_PKT_GET_FLOWID(PKTBUF);
        flow_ring_table = (flow_ring_table_t *)dhd->flow_ring_table;
        flow_ring_node = (flow_ring_node_t *)&flow_ring_table[flowid];

        ring = (msgbuf_ring_t *)flow_ring_node->prot_info;

        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Create a unique 32-bit packet id */
        pktid = DHD_NATIVE_TO_PKTID_RSV(dhd, dhd->prot->pktid_tx_map,
                PKTBUF, PKTTYPE_DATA_TX);
#if defined(DHD_PCIE_PKTID)
        if (pktid == DHD_PKTID_INVALID) {
                DHD_ERROR_RLMT(("%s: Pktid pool depleted.\n", __FUNCTION__));
                /*
                 * If we return error here, the caller would queue the packet
                 * again. So we'll just free the skb allocated in DMA Zone.
                 * Since we have not freed the original SKB yet the caller would
                 * requeue the same.
                 */
                goto err_no_res_pktfree;
        }
#endif /* DHD_PCIE_PKTID */

        /* Reserve space in the circular buffer */
        txdesc = (host_txbuf_post_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);
        if (txdesc == NULL) {
                DHD_INFO(("%s:%d: HTOD Msgbuf Not available TxCount = %d\n",
                        __FUNCTION__, __LINE__, OSL_ATOMIC_READ(dhd->osh, &prot->active_tx_count)));
                goto err_free_pktid;
        }

        DHD_DBG_PKT_MON_TX(dhd, PKTBUF, pktid);
#ifdef DHD_PKT_LOGGING
        DHD_PKTLOG_TX(dhd, PKTBUF, pktid);
#endif /* DHD_PKT_LOGGING */

        /* Extract the data pointer and length information */
        pktdata = PKTDATA(dhd->osh, PKTBUF);
        pktlen  = PKTLEN(dhd->osh, PKTBUF);

        /* Ethernet header: Copy before we cache flush packet using DMA_MAP */
        bcopy(pktdata, txdesc->txhdr, ETHER_HDR_LEN);

        /* Extract the ethernet header and adjust the data pointer and length */
        pktdata = PKTPULL(dhd->osh, PKTBUF, ETHER_HDR_LEN);
        pktlen -= ETHER_HDR_LEN;

        /* Map the data pointer to a DMA-able address */
        if (SECURE_DMA_ENAB(dhd->osh)) {
                int offset = 0;
                BCM_REFERENCE(offset);

                if (prot->tx_metadata_offset)
                        offset = prot->tx_metadata_offset + ETHER_HDR_LEN;

                pa = SECURE_DMA_MAP(dhd->osh, PKTDATA(dhd->osh, PKTBUF), pktlen,
                        DMA_TX, PKTBUF, 0, ring->dma_buf.secdma, offset);
        }
#ifndef BCM_SECURE_DMA
        else
                pa = DMA_MAP(dhd->osh, PKTDATA(dhd->osh, PKTBUF), pktlen, DMA_TX, PKTBUF, 0);
#endif /* #ifndef BCM_SECURE_DMA */

        if (PHYSADDRISZERO(pa)) {
                DHD_ERROR(("%s: Something really bad, unless 0 is "
                        "a valid phyaddr for pa\n", __FUNCTION__));
                ASSERT(0);
                goto err_rollback_idx;
        }

#ifdef DMAMAP_STATS
        dhd->dma_stats.txdata++;
        dhd->dma_stats.txdata_sz += pktlen;
#endif /* DMAMAP_STATS */
        /* No need to lock. Save the rest of the packet's metadata */
        DHD_NATIVE_TO_PKTID_SAVE(dhd, dhd->prot->pktid_tx_map, PKTBUF, pktid,
            pa, pktlen, DMA_TX, NULL, ring->dma_buf.secdma, PKTTYPE_DATA_TX);

#ifdef TXP_FLUSH_NITEMS
        if (ring->pend_items_count == 0)
                ring->start_addr = (void *)txdesc;
        ring->pend_items_count++;
#endif // endif

        /* Form the Tx descriptor message buffer */

        /* Common message hdr */
        txdesc->cmn_hdr.msg_type = MSG_TYPE_TX_POST;
        txdesc->cmn_hdr.if_id = ifidx;
        txdesc->cmn_hdr.flags = ring->current_phase;

        txdesc->flags = BCMPCIE_PKT_FLAGS_FRAME_802_3;
        prio = (uint8)PKTPRIO(PKTBUF);

        txdesc->flags |= (prio & 0x7) << BCMPCIE_PKT_FLAGS_PRIO_SHIFT;
        txdesc->seg_cnt = 1;

        txdesc->data_len = htol16((uint16) pktlen);
        txdesc->data_buf_addr.high_addr = htol32(PHYSADDRHI(pa));
        txdesc->data_buf_addr.low_addr  = htol32(PHYSADDRLO(pa));

        /* Move data pointer to keep ether header in local PKTBUF for later reference */
        PKTPUSH(dhd->osh, PKTBUF, ETHER_HDR_LEN);

        /* Handle Tx metadata */
        headroom = (uint16)PKTHEADROOM(dhd->osh, PKTBUF);
        if (prot->tx_metadata_offset && (headroom < prot->tx_metadata_offset))
                DHD_ERROR(("No headroom for Metadata tx %d %d\n",
                prot->tx_metadata_offset, headroom));

        if (prot->tx_metadata_offset && (headroom >= prot->tx_metadata_offset)) {
                DHD_TRACE(("Metadata in tx %d\n", prot->tx_metadata_offset));

                /* Adjust the data pointer to account for meta data in DMA_MAP */
                PKTPUSH(dhd->osh, PKTBUF, prot->tx_metadata_offset);

                if (SECURE_DMA_ENAB(dhd->osh)) {
                        meta_pa = SECURE_DMA_MAP_TXMETA(dhd->osh, PKTDATA(dhd->osh, PKTBUF),
                                prot->tx_metadata_offset + ETHER_HDR_LEN, DMA_RX, PKTBUF,
                                0, ring->dma_buf.secdma);
                }
#ifndef BCM_SECURE_DMA
                else
                        meta_pa = DMA_MAP(dhd->osh, PKTDATA(dhd->osh, PKTBUF),
                                prot->tx_metadata_offset, DMA_RX, PKTBUF, 0);
#endif /* #ifndef BCM_SECURE_DMA */

                if (PHYSADDRISZERO(meta_pa)) {
                        /* Unmap the data pointer to a DMA-able address */
                        if (SECURE_DMA_ENAB(dhd->osh)) {
                                int offset = 0;
                                BCM_REFERENCE(offset);

                                if (prot->tx_metadata_offset) {
                                        offset = prot->tx_metadata_offset + ETHER_HDR_LEN;
                                }

                                SECURE_DMA_UNMAP(dhd->osh, pa, pktlen,
                                        DMA_TX, 0, DHD_DMAH_NULL, ring->dma_buf.secdma, offset);
                        }
#ifndef BCM_SECURE_DMA
                        else {
                                DMA_UNMAP(dhd->osh, pa, pktlen, DMA_TX, 0, DHD_DMAH_NULL);
                        }
#endif /* #ifndef BCM_SECURE_DMA */
#ifdef TXP_FLUSH_NITEMS
                        /* update pend_items_count */
                        ring->pend_items_count--;
#endif /* TXP_FLUSH_NITEMS */

                        DHD_ERROR(("%s: Something really bad, unless 0 is "
                                "a valid phyaddr for meta_pa\n", __FUNCTION__));
                        ASSERT(0);
                        goto err_rollback_idx;
                }

                /* Adjust the data pointer back to original value */
                PKTPULL(dhd->osh, PKTBUF, prot->tx_metadata_offset);

                txdesc->metadata_buf_len = prot->tx_metadata_offset;
                txdesc->metadata_buf_addr.high_addr = htol32(PHYSADDRHI(meta_pa));
                txdesc->metadata_buf_addr.low_addr = htol32(PHYSADDRLO(meta_pa));
        } else {
                txdesc->metadata_buf_len = htol16(0);
                txdesc->metadata_buf_addr.high_addr = 0;
                txdesc->metadata_buf_addr.low_addr = 0;
        }

#ifdef DHD_PKTID_AUDIT_RING
        DHD_PKTID_AUDIT(dhd, prot->pktid_tx_map, pktid, DHD_DUPLICATE_ALLOC);
#endif /* DHD_PKTID_AUDIT_RING */

        txdesc->cmn_hdr.request_id = htol32(pktid);

        DHD_TRACE(("txpost: data_len %d, pktid 0x%04x\n", txdesc->data_len,
                txdesc->cmn_hdr.request_id));

#ifdef DHD_LBUF_AUDIT
        PKTAUDIT(dhd->osh, PKTBUF);
#endif // endif

        if (pktlen > MAX_MTU_SZ) {
                DHD_ERROR(("%s: ######## pktlen(%d) > MAX_MTU_SZ(%d) #######\n",
                        __FUNCTION__, pktlen, MAX_MTU_SZ));
                dhd_prhex("txringitem", (volatile uchar*)txdesc,
                        sizeof(host_txbuf_post_t), DHD_ERROR_VAL);
        }

        /* Update the write pointer in TCM & ring bell */
#ifdef TXP_FLUSH_NITEMS
        /* Flush if we have either hit the txp_threshold or if this msg is */
        /* occupying the last slot in the flow_ring - before wrap around.  */
        if ((ring->pend_items_count == prot->txp_threshold) ||
                ((uint8 *) txdesc == (uint8 *) DHD_RING_END_VA(ring))) {
                dhd_prot_txdata_write_flush(dhd, flowid);
        }
#else
        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, txdesc, 1);
#endif // endif
#ifdef TX_STATUS_LATENCY_STATS
        /* set the time when pkt is queued to flowring */
        DHD_PKT_SET_QTIME(PKTBUF, OSL_SYSUPTIME_US());
#endif /* TX_STATUS_LATENCY_STATS */

        OSL_ATOMIC_INC(dhd->osh, &prot->active_tx_count);
        /*
         * Take a wake lock, do not sleep if we have atleast one packet
         * to finish.
         */
        DHD_TXFL_WAKE_LOCK_TIMEOUT(dhd, MAX_TX_TIMEOUT);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return BCME_OK;

err_rollback_idx:
        /* roll back write pointer for unprocessed message */
        if (ring->wr == 0) {
                ring->wr = ring->max_items - 1;
        } else {
                ring->wr--;
                if (ring->wr == 0) {
                        DHD_INFO(("%s: flipping the phase now\n", ring->name));
                        ring->current_phase = ring->current_phase ?
                                0 : BCMPCIE_CMNHDR_PHASE_BIT_INIT;
                }
        }

err_free_pktid:
#if defined(DHD_PCIE_PKTID)
        {
                void *dmah;
                void *secdma;
                /* Free up the PKTID. physaddr and pktlen will be garbage. */
                DHD_PKTID_TO_NATIVE(dhd, dhd->prot->pktid_tx_map, pktid,
                        pa, pktlen, dmah, secdma, PKTTYPE_NO_CHECK);
        }

err_no_res_pktfree:
#endif /* DHD_PCIE_PKTID */

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return BCME_NORESOURCE;
} /* dhd_prot_txdata */

/* called with a ring_lock */
/** optimization to write "n" tx items at a time to ring */
void BCMFASTPATH
dhd_prot_txdata_write_flush(dhd_pub_t *dhd, uint16 flowid)
{
#ifdef TXP_FLUSH_NITEMS
        flow_ring_table_t *flow_ring_table;
        flow_ring_node_t *flow_ring_node;
        msgbuf_ring_t *ring;

        if (dhd->flow_ring_table == NULL) {
                return;
        }

        flow_ring_table = (flow_ring_table_t *)dhd->flow_ring_table;
        flow_ring_node = (flow_ring_node_t *)&flow_ring_table[flowid];
        ring = (msgbuf_ring_t *)flow_ring_node->prot_info;

        if (ring->pend_items_count) {
                /* update ring's WR index and ring doorbell to dongle */
                dhd_prot_ring_write_complete(dhd, ring, ring->start_addr,
                        ring->pend_items_count);
                ring->pend_items_count = 0;
                ring->start_addr = NULL;
        }
#endif /* TXP_FLUSH_NITEMS */
}

#undef PKTBUF   /* Only defined in the above routine */

int BCMFASTPATH
dhd_prot_hdrpull(dhd_pub_t *dhd, int *ifidx, void *pkt, uchar *buf, uint *len)
{
        return 0;
}

/** post a set of receive buffers to the dongle */
static void BCMFASTPATH
dhd_prot_return_rxbuf(dhd_pub_t *dhd, uint32 pktid, uint32 rxcnt)
{
        dhd_prot_t *prot = dhd->prot;
#if defined(DHD_LB_RXC)
        int elem_ix;
        uint32 *elem;
        bcm_workq_t *workq;

        workq = &prot->rx_compl_prod;

        /* Produce the work item */
        elem_ix = bcm_ring_prod(WORKQ_RING(workq), DHD_LB_WORKQ_SZ);
        if (elem_ix == BCM_RING_FULL) {
                DHD_ERROR(("%s LB RxCompl workQ is full\n", __FUNCTION__));
                ASSERT(0);
                return;
        }

        elem = WORKQ_ELEMENT(uint32, workq, elem_ix);
        *elem = pktid;

        smp_wmb();

        /* Sync WR index to consumer if the SYNC threshold has been reached */
        if (++prot->rx_compl_prod_sync >= DHD_LB_WORKQ_SYNC) {
                bcm_workq_prod_sync(workq);
                prot->rx_compl_prod_sync = 0;
        }

        DHD_INFO(("%s: rx_compl_prod pktid<%u> sync<%d>\n",
                __FUNCTION__, pktid, prot->rx_compl_prod_sync));

#endif /* DHD_LB_RXC */

        if (prot->rxbufpost >= rxcnt) {
                prot->rxbufpost -= (uint16)rxcnt;
        } else {
                /* ASSERT(0); */
                prot->rxbufpost = 0;
        }

#if !defined(DHD_LB_RXC)
        if (prot->rxbufpost <= (prot->max_rxbufpost - RXBUFPOST_THRESHOLD))
                dhd_msgbuf_rxbuf_post(dhd, FALSE); /* alloc pkt ids */
#endif /* !DHD_LB_RXC */
        return;
}

/* called before an ioctl is sent to the dongle */
static void
dhd_prot_wlioctl_intercept(dhd_pub_t *dhd, wl_ioctl_t * ioc, void * buf)
{
        dhd_prot_t *prot = dhd->prot;
        int slen = 0;

        if (ioc->cmd == WLC_SET_VAR && buf != NULL && !strcmp(buf, "pcie_bus_tput")) {
                pcie_bus_tput_params_t *tput_params;

                slen = strlen("pcie_bus_tput") + 1;
                tput_params = (pcie_bus_tput_params_t*)((char *)buf + slen);
                bcopy(&prot->host_bus_throughput_buf.pa, &tput_params->host_buf_addr,
                        sizeof(tput_params->host_buf_addr));
                tput_params->host_buf_len = DHD_BUS_TPUT_BUF_LEN;
        }

}

/* called after an ioctl returns from dongle */
static void
dhd_prot_wl_ioctl_ret_intercept(dhd_pub_t *dhd, wl_ioctl_t * ioc, void * buf,
        int ifidx, int ret, int len)
{

        if (!ret && ioc->cmd == WLC_SET_VAR && buf != NULL) {
                /* Intercept the wme_dp ioctl here */
                if (!strcmp(buf, "wme_dp")) {
                        int slen, val = 0;

                        slen = strlen("wme_dp") + 1;
                        if (len >= (int)(slen + sizeof(int)))
                                bcopy(((char *)buf + slen), &val, sizeof(int));
                        dhd->wme_dp = (uint8) ltoh32(val);
                }

        }

}

#ifdef DHD_PM_CONTROL_FROM_FILE
extern bool g_pm_control;
#endif /* DHD_PM_CONTROL_FROM_FILE */

/** Use protocol to issue ioctl to dongle. Only one ioctl may be in transit. */
int dhd_prot_ioctl(dhd_pub_t *dhd, int ifidx, wl_ioctl_t * ioc, void * buf, int len)
{
        int ret = -1;
        uint8 action;

        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("%s : PCIe link is down. we have nothing to do\n", __FUNCTION__));
                goto done;
        }

        if ((dhd->busstate == DHD_BUS_DOWN) || dhd->hang_was_sent) {
                DHD_ERROR(("%s : bus is down. we have nothing to do -"
                        " bus state: %d, sent hang: %d\n", __FUNCTION__,
                        dhd->busstate, dhd->hang_was_sent));
                goto done;
        }

        if (dhd->busstate == DHD_BUS_SUSPEND) {
                DHD_ERROR(("%s : bus is suspended\n", __FUNCTION__));
                goto done;
        }

        DHD_TRACE(("%s: Enter\n", __FUNCTION__));

        if (ioc->cmd == WLC_SET_PM) {
#ifdef DHD_PM_CONTROL_FROM_FILE
                if (g_pm_control == TRUE) {
                        DHD_ERROR(("%s: SET PM ignored!(Requested:%d)\n",
                                __FUNCTION__, buf ? *(char *)buf : 0));
                        goto done;
                }
#endif /* DHD_PM_CONTROL_FROM_FILE */
                DHD_TRACE_HW4(("%s: SET PM to %d\n", __FUNCTION__, buf ? *(char *)buf : 0));
        }

        ASSERT(len <= WLC_IOCTL_MAXLEN);

        if (len > WLC_IOCTL_MAXLEN)
                goto done;

        action = ioc->set;

        dhd_prot_wlioctl_intercept(dhd, ioc, buf);

        if (action & WL_IOCTL_ACTION_SET) {
                ret = dhd_msgbuf_set_ioctl(dhd, ifidx, ioc->cmd, buf, len, action);
        } else {
                ret = dhd_msgbuf_query_ioctl(dhd, ifidx, ioc->cmd, buf, len, action);
                if (ret > 0)
                        ioc->used = ret;
        }

        /* Too many programs assume ioctl() returns 0 on success */
        if (ret >= 0) {
                ret = 0;
        } else {
                dhd->dongle_error = ret;
        }

        dhd_prot_wl_ioctl_ret_intercept(dhd, ioc, buf, ifidx, ret, len);

done:
        return ret;

} /* dhd_prot_ioctl */

/** test / loopback */

int
dhdmsgbuf_lpbk_req(dhd_pub_t *dhd, uint len)
{
        unsigned long flags;
        dhd_prot_t *prot = dhd->prot;
        uint16 alloced = 0;

        ioct_reqst_hdr_t *ioct_rqst;

        uint16 hdrlen = sizeof(ioct_reqst_hdr_t);
        uint16 msglen = len + hdrlen;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        msglen = ALIGN_SIZE(msglen, DMA_ALIGN_LEN);
        msglen = LIMIT_TO_MAX(msglen, MSGBUF_MAX_MSG_SIZE);

        DHD_RING_LOCK(ring->ring_lock, flags);

        ioct_rqst = (ioct_reqst_hdr_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (ioct_rqst == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return 0;
        }

        {
                uint8 *ptr;
                uint16 i;

                ptr = (uint8 *)ioct_rqst;
                for (i = 0; i < msglen; i++) {
                        ptr[i] = i % 256;
                }
        }

        /* Common msg buf hdr */
        ioct_rqst->msg.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;

        ioct_rqst->msg.msg_type = MSG_TYPE_LOOPBACK;
        ioct_rqst->msg.if_id = 0;
        ioct_rqst->msg.flags = ring->current_phase;

        bcm_print_bytes("LPBK REQ: ", (uint8 *)ioct_rqst, msglen);

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, ioct_rqst, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return 0;
}

/** test / loopback */
void dmaxfer_free_dmaaddr(dhd_pub_t *dhd, dhd_dmaxfer_t *dmaxfer)
{
        if (dmaxfer == NULL)
                return;

        dhd_dma_buf_free(dhd, &dmaxfer->srcmem);
        dhd_dma_buf_free(dhd, &dmaxfer->dstmem);
}

/** test / loopback */
int
dhd_prepare_schedule_dmaxfer_free(dhd_pub_t *dhdp)
{
        dhd_prot_t *prot = dhdp->prot;
        dhd_dmaxfer_t *dmaxfer = &prot->dmaxfer;
        dmaxref_mem_map_t *dmap = NULL;

        dmap = MALLOCZ(dhdp->osh, sizeof(dmaxref_mem_map_t));
        if (!dmap) {
                DHD_ERROR(("%s: dmap alloc failed\n", __FUNCTION__));
                goto mem_alloc_fail;
        }
        dmap->srcmem = &(dmaxfer->srcmem);
        dmap->dstmem = &(dmaxfer->dstmem);

        DMAXFER_FREE(dhdp, dmap);
        return BCME_OK;

mem_alloc_fail:
        if (dmap) {
                MFREE(dhdp->osh, dmap, sizeof(dmaxref_mem_map_t));
                dmap = NULL;
        }
        return BCME_NOMEM;
} /* dhd_prepare_schedule_dmaxfer_free */

/** test / loopback */
void
dmaxfer_free_prev_dmaaddr(dhd_pub_t *dhdp, dmaxref_mem_map_t *dmmap)
{

        dhd_dma_buf_free(dhdp, dmmap->srcmem);
        dhd_dma_buf_free(dhdp, dmmap->dstmem);

        MFREE(dhdp->osh, dmmap, sizeof(dmaxref_mem_map_t));
        dmmap = NULL;

} /* dmaxfer_free_prev_dmaaddr */

/** test / loopback */
int dmaxfer_prepare_dmaaddr(dhd_pub_t *dhd, uint len,
        uint srcdelay, uint destdelay, dhd_dmaxfer_t *dmaxfer)
{
        uint i = 0, j = 0;
        if (!dmaxfer)
                return BCME_ERROR;

        /* First free up existing buffers */
        dmaxfer_free_dmaaddr(dhd, dmaxfer);

        if (dhd_dma_buf_alloc(dhd, &dmaxfer->srcmem, len)) {
                return BCME_NOMEM;
        }

        if (dhd_dma_buf_alloc(dhd, &dmaxfer->dstmem, len + 8)) {
                dhd_dma_buf_free(dhd, &dmaxfer->srcmem);
                return BCME_NOMEM;
        }

        dmaxfer->len = len;

        /* Populate source with a pattern like below
         * 0x00000000
         * 0x01010101
         * 0x02020202
         * 0x03030303
         * 0x04040404
         * 0x05050505
         * ...
         * 0xFFFFFFFF
         */
        while (i < dmaxfer->len) {
                ((uint8*)dmaxfer->srcmem.va)[i] = j % 256;
                i++;
                if (i % 4 == 0) {
                        j++;
                }
        }

        OSL_CACHE_FLUSH(dmaxfer->srcmem.va, dmaxfer->len);

        dmaxfer->srcdelay = srcdelay;
        dmaxfer->destdelay = destdelay;

        return BCME_OK;
} /* dmaxfer_prepare_dmaaddr */

static void
dhd_msgbuf_dmaxfer_process(dhd_pub_t *dhd, void *msg)
{
        dhd_prot_t *prot = dhd->prot;
        uint64 end_usec;
        pcie_dmaxfer_cmplt_t *cmplt = (pcie_dmaxfer_cmplt_t *)msg;

        BCM_REFERENCE(cmplt);
        end_usec = OSL_SYSUPTIME_US();

        DHD_ERROR(("DMA loopback status: %d\n", cmplt->compl_hdr.status));
        prot->dmaxfer.status = cmplt->compl_hdr.status;
        OSL_CACHE_INV(prot->dmaxfer.dstmem.va, prot->dmaxfer.len);
        if (prot->dmaxfer.srcmem.va && prot->dmaxfer.dstmem.va) {
                if (memcmp(prot->dmaxfer.srcmem.va,
                        prot->dmaxfer.dstmem.va, prot->dmaxfer.len) ||
                        cmplt->compl_hdr.status != BCME_OK) {
                        DHD_ERROR(("DMA loopback failed\n"));
                        prhex("XFER SRC: ",
                            prot->dmaxfer.srcmem.va, prot->dmaxfer.len);
                        prhex("XFER DST: ",
                            prot->dmaxfer.dstmem.va, prot->dmaxfer.len);
                        prot->dmaxfer.status = BCME_ERROR;
                }
                else {
                        switch (prot->dmaxfer.d11_lpbk) {
                        case M2M_DMA_LPBK: {
                                DHD_ERROR(("DMA successful pcie m2m DMA loopback\n"));
                                } break;
                        case D11_LPBK: {
                                DHD_ERROR(("DMA successful with d11 loopback\n"));
                                } break;
                        case BMC_LPBK: {
                                DHD_ERROR(("DMA successful with bmc loopback\n"));
                                } break;
                        case M2M_NON_DMA_LPBK: {
                                DHD_ERROR(("DMA successful pcie m2m NON DMA loopback\n"));
                                } break;
                        case D11_HOST_MEM_LPBK: {
                                DHD_ERROR(("DMA successful d11 host mem loopback\n"));
                                } break;
                        case BMC_HOST_MEM_LPBK: {
                                DHD_ERROR(("DMA successful bmc host mem loopback\n"));
                                } break;
                        default: {
                                DHD_ERROR(("Invalid loopback option\n"));
                                } break;
                        }

                        if (DHD_LPBKDTDUMP_ON()) {
                                /* debug info print of the Tx and Rx buffers */
                                dhd_prhex("XFER SRC: ", prot->dmaxfer.srcmem.va,
                                        prot->dmaxfer.len, DHD_INFO_VAL);
                                dhd_prhex("XFER DST: ", prot->dmaxfer.dstmem.va,
                                        prot->dmaxfer.len, DHD_INFO_VAL);
                        }
                }
        }

        dhd_prepare_schedule_dmaxfer_free(dhd);
        end_usec -= prot->dmaxfer.start_usec;
        if (end_usec)
                DHD_ERROR(("DMA loopback %d bytes in %lu usec, %u kBps\n",
                        prot->dmaxfer.len, (unsigned long)end_usec,
                        (prot->dmaxfer.len * (1000 * 1000 / 1024) / (uint32)end_usec)));
        dhd->prot->dmaxfer.in_progress = FALSE;

        dhd->bus->dmaxfer_complete = TRUE;
        dhd_os_dmaxfer_wake(dhd);
}

/** Test functionality.
 * Transfers bytes from host to dongle and to host again using DMA
 * This function is not reentrant, as prot->dmaxfer.in_progress is not protected
 * by a spinlock.
 */
int
dhdmsgbuf_dmaxfer_req(dhd_pub_t *dhd, uint len, uint srcdelay, uint destdelay,
        uint d11_lpbk, uint core_num)
{
        unsigned long flags;
        int ret = BCME_OK;
        dhd_prot_t *prot = dhd->prot;
        pcie_dma_xfer_params_t *dmap;
        uint32 xferlen = LIMIT_TO_MAX(len, DMA_XFER_LEN_LIMIT);
        uint16 alloced = 0;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        if (prot->dmaxfer.in_progress) {
                DHD_ERROR(("DMA is in progress...\n"));
                return BCME_ERROR;
        }

        if (d11_lpbk >= MAX_LPBK) {
                DHD_ERROR(("loopback mode should be either"
                        " 0-PCIE_M2M_DMA, 1-D11, 2-BMC or 3-PCIE_M2M_NonDMA\n"));
                return BCME_ERROR;
        }

        DHD_RING_LOCK(ring->ring_lock, flags);

        prot->dmaxfer.in_progress = TRUE;
        if ((ret = dmaxfer_prepare_dmaaddr(dhd, xferlen, srcdelay, destdelay,
                &prot->dmaxfer)) != BCME_OK) {
                prot->dmaxfer.in_progress = FALSE;
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return ret;
        }

        dmap = (pcie_dma_xfer_params_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (dmap == NULL) {
                dmaxfer_free_dmaaddr(dhd, &prot->dmaxfer);
                prot->dmaxfer.in_progress = FALSE;
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return BCME_NOMEM;
        }

        /* Common msg buf hdr */
        dmap->cmn_hdr.msg_type = MSG_TYPE_LPBK_DMAXFER;
        dmap->cmn_hdr.request_id = htol32(DHD_FAKE_PKTID);
        dmap->cmn_hdr.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        dmap->cmn_hdr.flags = ring->current_phase;
        ring->seqnum++;

        dmap->host_input_buf_addr.high = htol32(PHYSADDRHI(prot->dmaxfer.srcmem.pa));
        dmap->host_input_buf_addr.low = htol32(PHYSADDRLO(prot->dmaxfer.srcmem.pa));
        dmap->host_ouput_buf_addr.high = htol32(PHYSADDRHI(prot->dmaxfer.dstmem.pa));
        dmap->host_ouput_buf_addr.low = htol32(PHYSADDRLO(prot->dmaxfer.dstmem.pa));
        dmap->xfer_len = htol32(prot->dmaxfer.len);
        dmap->srcdelay = htol32(prot->dmaxfer.srcdelay);
        dmap->destdelay = htol32(prot->dmaxfer.destdelay);
        prot->dmaxfer.d11_lpbk = d11_lpbk;
        dmap->flags = (((core_num & PCIE_DMA_XFER_FLG_CORE_NUMBER_MASK)
                        << PCIE_DMA_XFER_FLG_CORE_NUMBER_SHIFT) |
                        ((prot->dmaxfer.d11_lpbk & PCIE_DMA_XFER_FLG_D11_LPBK_MASK)
                         << PCIE_DMA_XFER_FLG_D11_LPBK_SHIFT));
        prot->dmaxfer.start_usec = OSL_SYSUPTIME_US();

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, dmap, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        DHD_ERROR(("DMA loopback Started...\n"));

        return BCME_OK;
} /* dhdmsgbuf_dmaxfer_req */

dma_xfer_status_t
dhdmsgbuf_dmaxfer_status(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;

        if (prot->dmaxfer.in_progress)
                return DMA_XFER_IN_PROGRESS;
        else if (prot->dmaxfer.status == BCME_OK)
                return DMA_XFER_SUCCESS;
        else
                return DMA_XFER_FAILED;
}

/** Called in the process of submitting an ioctl to the dongle */
static int
dhd_msgbuf_query_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd, void *buf, uint len, uint8 action)
{
        int ret = 0;
        uint copylen = 0;

        DHD_TRACE(("%s: Enter\n", __FUNCTION__));

        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("%s : PCIe link is down. we have nothing to do\n",
                        __FUNCTION__));
                return -EIO;
        }

        if (dhd->busstate == DHD_BUS_DOWN) {
                DHD_ERROR(("%s : bus is down. we have nothing to do\n", __FUNCTION__));
                return -EIO;
        }

        /* don't talk to the dongle if fw is about to be reloaded */
        if (dhd->hang_was_sent) {
                DHD_ERROR(("%s: HANG was sent up earlier. Not talking to the chip\n",
                        __FUNCTION__));
                return -EIO;
        }

        if (cmd == WLC_GET_VAR && buf)
        {
                if (!len || !*(uint8 *)buf) {
                        DHD_ERROR(("%s(): Zero length bailing\n", __FUNCTION__));
                        ret = BCME_BADARG;
                        goto done;
                }

                /* Respond "bcmerror" and "bcmerrorstr" with local cache */
                copylen = MIN(len, BCME_STRLEN);

                if ((len >= strlen("bcmerrorstr")) &&
                        (!strcmp((char *)buf, "bcmerrorstr"))) {
                        strncpy((char *)buf, bcmerrorstr(dhd->dongle_error), copylen);
                        *(uint8 *)((uint8 *)buf + (copylen - 1)) = '\0';
                        goto done;
                } else if ((len >= strlen("bcmerror")) &&
                        !strcmp((char *)buf, "bcmerror")) {
                        *(uint32 *)(uint32 *)buf = dhd->dongle_error;
                        goto done;
                }
        }

        DHD_CTL(("query_ioctl: ACTION %d ifdix %d cmd %d len %d \n",
            action, ifidx, cmd, len));

        ret = dhd_fillup_ioct_reqst(dhd, (uint16)len, cmd, buf, ifidx);

        if (ret < 0) {
                DHD_ERROR(("%s(): dhd_fillup_ioct_reqst failed \r\n", __FUNCTION__));
                goto done;
        }

        /* wait for IOCTL completion message from dongle and get first fragment */
        ret = dhd_msgbuf_wait_ioctl_cmplt(dhd, len, buf);

done:
        return ret;
}

void
dhd_msgbuf_iovar_timeout_dump(dhd_pub_t *dhd)
{
        uint32 intstatus;
        dhd_prot_t *prot = dhd->prot;
        dhd->rxcnt_timeout++;
        dhd->rx_ctlerrs++;
        dhd->iovar_timeout_occured = TRUE;
        DHD_ERROR(("%s: resumed on timeout rxcnt_timeout%s %d ioctl_cmd %d "
                "trans_id %d state %d busstate=%d ioctl_received=%d\n", __FUNCTION__,
                dhd->is_sched_error ? " due to scheduling problem" : "",
                dhd->rxcnt_timeout, prot->curr_ioctl_cmd, prot->ioctl_trans_id,
                prot->ioctl_state, dhd->busstate, prot->ioctl_received));
#if defined(DHD_KERNEL_SCHED_DEBUG) && defined(DHD_FW_COREDUMP)
        if (dhd->is_sched_error && dhd->memdump_enabled) {
                /* change g_assert_type to trigger Kernel panic */
                g_assert_type = 2;
                /* use ASSERT() to trigger panic */
                ASSERT(0);
        }
#endif /* DHD_KERNEL_SCHED_DEBUG && DHD_FW_COREDUMP */

        if (prot->curr_ioctl_cmd == WLC_SET_VAR ||
                        prot->curr_ioctl_cmd == WLC_GET_VAR) {
                char iovbuf[32];
                int i;
                int dump_size = 128;
                uint8 *ioctl_buf = (uint8 *)prot->ioctbuf.va;
                memset(iovbuf, 0, sizeof(iovbuf));
                strncpy(iovbuf, ioctl_buf, sizeof(iovbuf) - 1);
                iovbuf[sizeof(iovbuf) - 1] = '\0';
                DHD_ERROR(("Current IOVAR (%s): %s\n",
                        prot->curr_ioctl_cmd == WLC_SET_VAR ?
                        "WLC_SET_VAR" : "WLC_GET_VAR", iovbuf));
                DHD_ERROR(("========== START IOCTL REQBUF DUMP ==========\n"));
                for (i = 0; i < dump_size; i++) {
                        DHD_ERROR(("%02X ", ioctl_buf[i]));
                        if ((i % 32) == 31) {
                                DHD_ERROR(("\n"));
                        }
                }
                DHD_ERROR(("\n========== END IOCTL REQBUF DUMP ==========\n"));
        }

        /* Check the PCIe link status by reading intstatus register */
        intstatus = si_corereg(dhd->bus->sih,
                        dhd->bus->sih->buscoreidx, dhd->bus->pcie_mailbox_int, 0, 0);
        if (intstatus == (uint32)-1) {
                DHD_ERROR(("%s : PCIe link might be down\n", __FUNCTION__));
                dhd->bus->is_linkdown = TRUE;
        }

        dhd_bus_dump_console_buffer(dhd->bus);
        dhd_prot_debug_info_print(dhd);
}

/**
 * Waits for IOCTL completion message from the dongle, copies this into caller
 * provided parameter 'buf'.
 */
static int
dhd_msgbuf_wait_ioctl_cmplt(dhd_pub_t *dhd, uint32 len, void *buf)
{
        dhd_prot_t *prot = dhd->prot;
        int timeleft;
        unsigned long flags;
        int ret = 0;

        DHD_TRACE(("%s: Enter\n", __FUNCTION__));

        if (dhd_query_bus_erros(dhd)) {
                ret = -EIO;
                goto out;
        }

        timeleft = dhd_os_ioctl_resp_wait(dhd, (uint *)&prot->ioctl_received);

#ifdef DHD_RECOVER_TIMEOUT
        if (prot->ioctl_received == 0) {
                uint32 intstatus = si_corereg(dhd->bus->sih,
                        dhd->bus->sih->buscoreidx, dhd->bus->pcie_mailbox_int, 0, 0);
                int host_irq_disbled = dhdpcie_irq_disabled(dhd->bus);
                if ((intstatus) && (intstatus != (uint32)-1) &&
                        (timeleft == 0) && (!dhd_query_bus_erros(dhd))) {
                        DHD_ERROR(("%s: iovar timeout trying again intstatus=%x"
                                " host_irq_disabled=%d\n",
                                __FUNCTION__, intstatus, host_irq_disbled));
                        dhd_pcie_intr_count_dump(dhd);
                        dhd_print_tasklet_status(dhd);
                        dhd_prot_process_ctrlbuf(dhd);
                        timeleft = dhd_os_ioctl_resp_wait(dhd, (uint *)&prot->ioctl_received);
                        /* Clear Interrupts */
                        dhdpcie_bus_clear_intstatus(dhd->bus);
                }
        }
#endif /* DHD_RECOVER_TIMEOUT */

        if (timeleft == 0 && (!dhd_query_bus_erros(dhd))) {
                /* check if resumed on time out related to scheduling issue */
                dhd->is_sched_error = FALSE;
                if (dhd->bus->isr_entry_time > prot->ioctl_fillup_time) {
                        dhd->is_sched_error = dhd_bus_query_dpc_sched_errors(dhd);
                }

                dhd_msgbuf_iovar_timeout_dump(dhd);

#ifdef DHD_FW_COREDUMP
                /* Collect socram dump */
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_RESUMED_ON_TIMEOUT;
                        dhd_bus_mem_dump(dhd);
                }
#endif /* DHD_FW_COREDUMP */
#ifdef SUPPORT_LINKDOWN_RECOVERY
#ifdef CONFIG_ARCH_MSM
                dhd->bus->no_cfg_restore = 1;
#endif /* CONFIG_ARCH_MSM */
#endif /* SUPPORT_LINKDOWN_RECOVERY */
                ret = -ETIMEDOUT;
                goto out;
        } else {
                if (prot->ioctl_received != IOCTL_RETURN_ON_SUCCESS) {
                        DHD_ERROR(("%s: IOCTL failure due to ioctl_received = %d\n",
                                __FUNCTION__, prot->ioctl_received));
                        ret = -EINVAL;
                        goto out;
                }
                dhd->rxcnt_timeout = 0;
                dhd->rx_ctlpkts++;
                DHD_CTL(("%s: ioctl resp resumed, got %d\n",
                        __FUNCTION__, prot->ioctl_resplen));
        }

        if (dhd->prot->ioctl_resplen > len)
                dhd->prot->ioctl_resplen = (uint16)len;
        if (buf)
                bcopy(dhd->prot->retbuf.va, buf, dhd->prot->ioctl_resplen);

        ret = (int)(dhd->prot->ioctl_status);

out:
        DHD_GENERAL_LOCK(dhd, flags);
        dhd->prot->ioctl_state = 0;
        dhd->prot->ioctl_resplen = 0;
        dhd->prot->ioctl_received = IOCTL_WAIT;
        dhd->prot->curr_ioctl_cmd = 0;
        DHD_GENERAL_UNLOCK(dhd, flags);

        return ret;
} /* dhd_msgbuf_wait_ioctl_cmplt */

static int
dhd_msgbuf_set_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd, void *buf, uint len, uint8 action)
{
        int ret = 0;

        DHD_TRACE(("%s: Enter \n", __FUNCTION__));

        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("%s : PCIe link is down. we have nothing to do\n",
                        __FUNCTION__));
                return -EIO;
        }

        if (dhd->busstate == DHD_BUS_DOWN) {
                DHD_ERROR(("%s : bus is down. we have nothing to do\n", __FUNCTION__));
                return -EIO;
        }

        /* don't talk to the dongle if fw is about to be reloaded */
        if (dhd->hang_was_sent) {
                DHD_ERROR(("%s: HANG was sent up earlier. Not talking to the chip\n",
                        __FUNCTION__));
                return -EIO;
        }

        DHD_CTL(("ACTION %d ifdix %d cmd %d len %d \n",
                action, ifidx, cmd, len));

        /* Fill up msgbuf for ioctl req */
        ret = dhd_fillup_ioct_reqst(dhd, (uint16)len, cmd, buf, ifidx);

        if (ret < 0) {
                DHD_ERROR(("%s(): dhd_fillup_ioct_reqst failed \r\n", __FUNCTION__));
                goto done;
        }

        ret = dhd_msgbuf_wait_ioctl_cmplt(dhd, len, buf);

done:
        return ret;
}

/** Called by upper DHD layer. Handles a protocol control response asynchronously. */
int dhd_prot_ctl_complete(dhd_pub_t *dhd)
{
        return 0;
}

/** Called by upper DHD layer. Check for and handle local prot-specific iovar commands */
int dhd_prot_iovar_op(dhd_pub_t *dhd, const char *name,
                             void *params, int plen, void *arg, int len, bool set)
{
        return BCME_UNSUPPORTED;
}

#ifdef DHD_DUMP_PCIE_RINGS
int dhd_d2h_h2d_ring_dump(dhd_pub_t *dhd, void *file, unsigned long *file_posn)
{
        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring;
        int ret = 0;

        ring = &prot->h2dring_ctrl_subn;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = &prot->d2hring_ctrl_cpln;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = prot->h2dring_info_subn;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = prot->d2hring_info_cpln;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = &prot->d2hring_tx_cpln;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = &prot->d2hring_rx_cpln;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

        ring = prot->h2d_flowrings_pool;
        if ((ret = dhd_ring_write(dhd, ring, file, file_posn)) < 0)
                goto exit;

exit :
        return ret;
}

/* Writes to file in TLV format */
static
int dhd_ring_write(dhd_pub_t *dhd, msgbuf_ring_t *ring, void *file, unsigned long *file_posn)
{
        unsigned long flags;
        int len = 0;
        int ret = 0;
        uint16  loc_rd = 0;

        while (len < ((ring->max_items) * (ring->item_len))) {
                uint8 *msg_addr;
                cmn_msg_hdr_t *msg;

                DHD_RING_LOCK(ring->ring_lock, flags);
                msg_addr = (uint8*)ring->dma_buf.va + (loc_rd * ring->item_len);
                ASSERT(loc_rd < ring->max_items);
                DHD_RING_UNLOCK(ring->ring_lock, flags);

                if (msg_addr == NULL) {
                        return BCME_ERROR;
                }
                msg = (cmn_msg_hdr_t *)msg_addr;

                ret = dhd_os_write_file_posn(file, file_posn, (char *)(&(msg->msg_type)),
                        sizeof(msg->msg_type));
                if (ret < 0) {
                        DHD_ERROR(("%s: write file error !\n", __FUNCTION__));
                        return BCME_ERROR;
                }
                ret = dhd_os_write_file_posn(file, file_posn, (char *)(&(ring->item_len)),
                        sizeof(ring->item_len));
                if (ret < 0) {
                        DHD_ERROR(("%s: write file error !\n", __FUNCTION__));
                        return BCME_ERROR;
                }
                ret = dhd_os_write_file_posn(file, file_posn, (char *)msg_addr, ring->item_len);
                if (ret < 0) {
                        DHD_ERROR(("%s: write file error !\n", __FUNCTION__));
                        return BCME_ERROR;
                }

                len += ring->item_len;
                loc_rd += 1;
        }
        return BCME_OK;
}
#endif /* DHD_DUMP_PCIE_RINGS */

/** Add prot dump output to a buffer */
void dhd_prot_dump(dhd_pub_t *dhd, struct bcmstrbuf *b)
{

        if (dhd->d2h_sync_mode & PCIE_SHARED_D2H_SYNC_SEQNUM)
                bcm_bprintf(b, "\nd2h_sync: SEQNUM:");
        else if (dhd->d2h_sync_mode & PCIE_SHARED_D2H_SYNC_XORCSUM)
                bcm_bprintf(b, "\nd2h_sync: XORCSUM:");
        else
                bcm_bprintf(b, "\nd2h_sync: NONE:");
        bcm_bprintf(b, " d2h_sync_wait max<%lu> tot<%lu>\n",
                dhd->prot->d2h_sync_wait_max, dhd->prot->d2h_sync_wait_tot);

        bcm_bprintf(b, "\nDongle DMA Indices: h2d %d  d2h %d index size %d bytes\n",
                dhd->dma_h2d_ring_upd_support,
                dhd->dma_d2h_ring_upd_support,
                dhd->prot->rw_index_sz);
        bcm_bprintf(b, "h2d_max_txpost: %d, prot->h2d_max_txpost: %d\n",
                h2d_max_txpost, dhd->prot->h2d_max_txpost);
}

/* Update local copy of dongle statistics */
void dhd_prot_dstats(dhd_pub_t *dhd)
{
        return;
}

/** Called by upper DHD layer */
int dhd_process_pkt_reorder_info(dhd_pub_t *dhd, uchar *reorder_info_buf,
        uint reorder_info_len, void **pkt, uint32 *free_buf_count)
{
        return 0;
}

/** Debug related, post a dummy message to interrupt dongle. Used to process cons commands. */
int
dhd_post_dummy_msg(dhd_pub_t *dhd)
{
        unsigned long flags;
        hostevent_hdr_t *hevent = NULL;
        uint16 alloced = 0;

        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ring->ring_lock, flags);

        hevent = (hostevent_hdr_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (hevent == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return -1;
        }

        /* CMN msg header */
        hevent->msg.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;
        hevent->msg.msg_type = MSG_TYPE_HOST_EVNT;
        hevent->msg.if_id = 0;
        hevent->msg.flags = ring->current_phase;

        /* Event payload */
        hevent->evnt_pyld = htol32(HOST_EVENT_CONS_CMD);

        /* Since, we are filling the data directly into the bufptr obtained
         * from the msgbuf, we can directly call the write_complete
         */
        dhd_prot_ring_write_complete(dhd, ring, hevent, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return 0;
}

/**
 * If exactly_nitems is true, this function will allocate space for nitems or fail
 * If exactly_nitems is false, this function will allocate space for nitems or less
 */
static void * BCMFASTPATH
dhd_prot_alloc_ring_space(dhd_pub_t *dhd, msgbuf_ring_t *ring,
        uint16 nitems, uint16 * alloced, bool exactly_nitems)
{
        void * ret_buf;

        /* Alloc space for nitems in the ring */
        ret_buf = dhd_prot_get_ring_space(ring, nitems, alloced, exactly_nitems);

        if (ret_buf == NULL) {
                /* if alloc failed , invalidate cached read ptr */
                if (dhd->dma_d2h_ring_upd_support) {
                        ring->rd = dhd_prot_dma_indx_get(dhd, H2D_DMA_INDX_RD_UPD, ring->idx);
                } else {
                        dhd_bus_cmn_readshared(dhd->bus, &(ring->rd), RING_RD_UPD, ring->idx);
#ifdef SUPPORT_LINKDOWN_RECOVERY
                        /* Check if ring->rd is valid */
                        if (ring->rd >= ring->max_items) {
                                DHD_ERROR(("%s: Invalid rd idx=%d\n", ring->name, ring->rd));
                                dhd->bus->read_shm_fail = TRUE;
                                return NULL;
                        }
#endif /* SUPPORT_LINKDOWN_RECOVERY */
                }

                /* Try allocating once more */
                ret_buf = dhd_prot_get_ring_space(ring, nitems, alloced, exactly_nitems);

                if (ret_buf == NULL) {
                        DHD_INFO(("%s: Ring space not available  \n", ring->name));
                        return NULL;
                }
        }

        if (ret_buf == HOST_RING_BASE(ring)) {
                DHD_INFO(("%s: setting the phase now\n", ring->name));
                ring->current_phase = ring->current_phase ? 0 : BCMPCIE_CMNHDR_PHASE_BIT_INIT;
        }

        /* Return alloced space */
        return ret_buf;
}

/**
 * Non inline ioct request.
 * Form a ioctl request first as per ioctptr_reqst_hdr_t header in the circular buffer
 * Form a separate request buffer where a 4 byte cmn header is added in the front
 * buf contents from parent function is copied to remaining section of this buffer
 */
static int
dhd_fillup_ioct_reqst(dhd_pub_t *dhd, uint16 len, uint cmd, void* buf, int ifidx)
{
        dhd_prot_t *prot = dhd->prot;
        ioctl_req_msg_t *ioct_rqst;
        void * ioct_buf;        /* For ioctl payload */
        uint16  rqstlen, resplen;
        unsigned long flags;
        uint16 alloced = 0;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        if (dhd_query_bus_erros(dhd)) {
                return -EIO;
        }

        rqstlen = len;
        resplen = len;

        /* Limit ioct request to MSGBUF_MAX_MSG_SIZE bytes including hdrs */
        /* 8K allocation of dongle buffer fails */
        /* dhd doesnt give separate input & output buf lens */
        /* so making the assumption that input length can never be more than 2k */
        rqstlen = MIN(rqstlen, MSGBUF_IOCTL_MAX_RQSTLEN);

        DHD_RING_LOCK(ring->ring_lock, flags);

        if (prot->ioctl_state) {
                DHD_ERROR(("%s: pending ioctl %02x\n", __FUNCTION__, prot->ioctl_state));
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return BCME_BUSY;
        } else {
                prot->ioctl_state = MSGBUF_IOCTL_ACK_PENDING | MSGBUF_IOCTL_RESP_PENDING;
        }

        /* Request for cbuf space */
        ioct_rqst = (ioctl_req_msg_t*)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);
        if (ioct_rqst == NULL) {
                DHD_ERROR(("couldn't allocate space on msgring to send ioctl request\n"));
                prot->ioctl_state = 0;
                prot->curr_ioctl_cmd = 0;
                prot->ioctl_received = IOCTL_WAIT;
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                return -1;
        }

        /* Common msg buf hdr */
        ioct_rqst->cmn_hdr.msg_type = MSG_TYPE_IOCTLPTR_REQ;
        ioct_rqst->cmn_hdr.if_id = (uint8)ifidx;
        ioct_rqst->cmn_hdr.flags = ring->current_phase;
        ioct_rqst->cmn_hdr.request_id = htol32(DHD_IOCTL_REQ_PKTID);
        ioct_rqst->cmn_hdr.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;

        ioct_rqst->cmd = htol32(cmd);
        prot->curr_ioctl_cmd = cmd;
        ioct_rqst->output_buf_len = htol16(resplen);
        prot->ioctl_trans_id++;
        ioct_rqst->trans_id = prot->ioctl_trans_id;

        /* populate ioctl buffer info */
        ioct_rqst->input_buf_len = htol16(rqstlen);
        ioct_rqst->host_input_buf_addr.high = htol32(PHYSADDRHI(prot->ioctbuf.pa));
        ioct_rqst->host_input_buf_addr.low = htol32(PHYSADDRLO(prot->ioctbuf.pa));
        /* copy ioct payload */
        ioct_buf = (void *) prot->ioctbuf.va;

        prot->ioctl_fillup_time = OSL_LOCALTIME_NS();

        if (buf)
                memcpy(ioct_buf, buf, len);

        OSL_CACHE_FLUSH((void *) prot->ioctbuf.va, len);

        if (!ISALIGNED(ioct_buf, DMA_ALIGN_LEN))
                DHD_ERROR(("host ioct address unaligned !!!!! \n"));

        DHD_CTL(("submitted IOCTL request request_id %d, cmd %d, output_buf_len %d, tx_id %d\n",
                ioct_rqst->cmn_hdr.request_id, cmd, ioct_rqst->output_buf_len,
                ioct_rqst->trans_id));

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, ioct_rqst, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return 0;
} /* dhd_fillup_ioct_reqst */

/**
 * dhd_prot_ring_attach - Initialize the msgbuf_ring object and attach a
 * DMA-able buffer to it. The ring is NOT tagged as inited until all the ring
 * information is posted to the dongle.
 *
 * Invoked in dhd_prot_attach for the common rings, and in dhd_prot_init for
 * each flowring in pool of flowrings.
 *
 * returns BCME_OK=0 on success
 * returns non-zero negative error value on failure.
 */
static int
dhd_prot_ring_attach(dhd_pub_t *dhd, msgbuf_ring_t *ring, const char *name,
        uint16 max_items, uint16 item_len, uint16 ringid)
{
        int dma_buf_alloced = BCME_NOMEM;
        uint32 dma_buf_len = max_items * item_len;
        dhd_prot_t *prot = dhd->prot;
        uint16 max_flowrings = dhd->bus->max_tx_flowrings;

        ASSERT(ring);
        ASSERT(name);
        ASSERT((max_items < 0xFFFF) && (item_len < 0xFFFF) && (ringid < 0xFFFF));

        /* Init name */
        strncpy(ring->name, name, RING_NAME_MAX_LENGTH);
        ring->name[RING_NAME_MAX_LENGTH - 1] = '\0';

        ring->idx = ringid;

        ring->max_items = max_items;
        ring->item_len = item_len;

        /* A contiguous space may be reserved for all flowrings */
        if (DHD_IS_FLOWRING(ringid, max_flowrings) && (prot->flowrings_dma_buf.va)) {
                /* Carve out from the contiguous DMA-able flowring buffer */
                uint16 flowid;
                uint32 base_offset;

                dhd_dma_buf_t *dma_buf = &ring->dma_buf;
                dhd_dma_buf_t *rsv_buf = &prot->flowrings_dma_buf;

                flowid = DHD_RINGID_TO_FLOWID(ringid);
                base_offset = (flowid - BCMPCIE_H2D_COMMON_MSGRINGS) * dma_buf_len;

                ASSERT(base_offset + dma_buf_len <= rsv_buf->len);

                dma_buf->len = dma_buf_len;
                dma_buf->va = (void *)((uintptr)rsv_buf->va + base_offset);
                PHYSADDRHISET(dma_buf->pa, PHYSADDRHI(rsv_buf->pa));
                PHYSADDRLOSET(dma_buf->pa, PHYSADDRLO(rsv_buf->pa) + base_offset);

                /* On 64bit, contiguous space may not span across 0x00000000FFFFFFFF */
                ASSERT(PHYSADDRLO(dma_buf->pa) >= PHYSADDRLO(rsv_buf->pa));

                dma_buf->dmah   = rsv_buf->dmah;
                dma_buf->secdma = rsv_buf->secdma;

                (void)dhd_dma_buf_audit(dhd, &ring->dma_buf);
        } else {
                /* Allocate a dhd_dma_buf */
                dma_buf_alloced = dhd_dma_buf_alloc(dhd, &ring->dma_buf, dma_buf_len);
                if (dma_buf_alloced != BCME_OK) {
                        return BCME_NOMEM;
                }
        }

        /* CAUTION: Save ring::base_addr in little endian format! */
        dhd_base_addr_htolpa(&ring->base_addr, ring->dma_buf.pa);

#ifdef BCM_SECURE_DMA
        if (SECURE_DMA_ENAB(prot->osh)) {
                ring->dma_buf.secdma = MALLOCZ(prot->osh, sizeof(sec_cma_info_t));
                if (ring->dma_buf.secdma == NULL) {
                        goto free_dma_buf;
                }
        }
#endif /* BCM_SECURE_DMA */

        ring->ring_lock = dhd_os_spin_lock_init(dhd->osh);

        DHD_INFO(("RING_ATTACH : %s Max item %d len item %d total size %d "
                "ring start %p buf phys addr  %x:%x \n",
                ring->name, ring->max_items, ring->item_len,
                dma_buf_len, ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                ltoh32(ring->base_addr.low_addr)));

        return BCME_OK;

#ifdef BCM_SECURE_DMA
free_dma_buf:
        if (dma_buf_alloced == BCME_OK) {
                dhd_dma_buf_free(dhd, &ring->dma_buf);
        }
#endif /* BCM_SECURE_DMA */

        return BCME_NOMEM;

} /* dhd_prot_ring_attach */

/**
 * dhd_prot_ring_init - Post the common ring information to dongle.
 *
 * Used only for common rings.
 *
 * The flowrings information is passed via the create flowring control message
 * (tx_flowring_create_request_t) sent over the H2D control submission common
 * ring.
 */
static void
dhd_prot_ring_init(dhd_pub_t *dhd, msgbuf_ring_t *ring)
{
        ring->wr = 0;
        ring->rd = 0;
        ring->curr_rd = 0;

        /* CAUTION: ring::base_addr already in Little Endian */
        dhd_bus_cmn_writeshared(dhd->bus, &ring->base_addr,
                sizeof(sh_addr_t), RING_BUF_ADDR, ring->idx);
        dhd_bus_cmn_writeshared(dhd->bus, &ring->max_items,
                sizeof(uint16), RING_MAX_ITEMS, ring->idx);
        dhd_bus_cmn_writeshared(dhd->bus, &ring->item_len,
                sizeof(uint16), RING_ITEM_LEN, ring->idx);

        dhd_bus_cmn_writeshared(dhd->bus, &(ring->wr),
                sizeof(uint16), RING_WR_UPD, ring->idx);
        dhd_bus_cmn_writeshared(dhd->bus, &(ring->rd),
                sizeof(uint16), RING_RD_UPD, ring->idx);

        /* ring inited */
        ring->inited = TRUE;

} /* dhd_prot_ring_init */

/**
 * dhd_prot_ring_reset - bzero a ring's DMA-ble buffer and cache flush
 * Reset WR and RD indices to 0.
 */
static void
dhd_prot_ring_reset(dhd_pub_t *dhd, msgbuf_ring_t *ring)
{
        DHD_TRACE(("%s\n", __FUNCTION__));

        dhd_dma_buf_reset(dhd, &ring->dma_buf);

        ring->rd = ring->wr = 0;
        ring->curr_rd = 0;
        ring->inited = FALSE;
        ring->create_pending = FALSE;
}

/**
 * dhd_prot_ring_detach - Detach the DMA-able buffer and any other objects
 * hanging off the msgbuf_ring.
 */
static void
dhd_prot_ring_detach(dhd_pub_t *dhd, msgbuf_ring_t *ring)
{
        dhd_prot_t *prot = dhd->prot;
        uint16 max_flowrings = dhd->bus->max_tx_flowrings;
        ASSERT(ring);

        ring->inited = FALSE;
        /* rd = ~0, wr = ring->rd - 1, max_items = 0, len_item = ~0 */

#ifdef BCM_SECURE_DMA
        if (SECURE_DMA_ENAB(prot->osh)) {
                if (ring->dma_buf.secdma) {
                        SECURE_DMA_UNMAP_ALL(prot->osh, ring->dma_buf.secdma);
                        MFREE(prot->osh, ring->dma_buf.secdma, sizeof(sec_cma_info_t));
                        ring->dma_buf.secdma = NULL;
                }
        }
#endif /* BCM_SECURE_DMA */

        /* If the DMA-able buffer was carved out of a pre-reserved contiguous
         * memory, then simply stop using it.
         */
        if (DHD_IS_FLOWRING(ring->idx, max_flowrings) && (prot->flowrings_dma_buf.va)) {
                (void)dhd_dma_buf_audit(dhd, &ring->dma_buf);
                memset(&ring->dma_buf, 0, sizeof(dhd_dma_buf_t));
        } else {
                dhd_dma_buf_free(dhd, &ring->dma_buf);
        }

        dhd_os_spin_lock_deinit(dhd->osh, ring->ring_lock);

} /* dhd_prot_ring_detach */

/*
 * +----------------------------------------------------------------------------
 * Flowring Pool
 *
 * Unlike common rings, which are attached very early on (dhd_prot_attach),
 * flowrings are dynamically instantiated. Moreover, flowrings may require a
 * larger DMA-able buffer. To avoid issues with fragmented cache coherent
 * DMA-able memory, a pre-allocated pool of msgbuf_ring_t is allocated once.
 * The DMA-able buffers are attached to these pre-allocated msgbuf_ring.
 *
 * Each DMA-able buffer may be allocated independently, or may be carved out
 * of a single large contiguous region that is registered with the protocol
 * layer into flowrings_dma_buf. On a 64bit platform, this contiguous region
 * may not span 0x00000000FFFFFFFF (avoid dongle side 64bit ptr arithmetic).
 *
 * No flowring pool action is performed in dhd_prot_attach(), as the number
 * of h2d rings is not yet known.
 *
 * In dhd_prot_init(), the dongle advertized number of h2d rings is used to
 * determine the number of flowrings required, and a pool of msgbuf_rings are
 * allocated and a DMA-able buffer (carved or allocated) is attached.
 * See: dhd_prot_flowrings_pool_attach()
 *
 * A flowring msgbuf_ring object may be fetched from this pool during flowring
 * creation, using the flowid. Likewise, flowrings may be freed back into the
 * pool on flowring deletion.
 * See: dhd_prot_flowrings_pool_fetch(), dhd_prot_flowrings_pool_release()
 *
 * In dhd_prot_detach(), the flowring pool is detached. The DMA-able buffers
 * are detached (returned back to the carved region or freed), and the pool of
 * msgbuf_ring and any objects allocated against it are freed.
 * See: dhd_prot_flowrings_pool_detach()
 *
 * In dhd_prot_reset(), the flowring pool is simply reset by returning it to a
 * state as-if upon an attach. All DMA-able buffers are retained.
 * Following a dhd_prot_reset(), in a subsequent dhd_prot_init(), the flowring
 * pool attach will notice that the pool persists and continue to use it. This
 * will avoid the case of a fragmented DMA-able region.
 *
 * +----------------------------------------------------------------------------
 */

/* Conversion of a flowid to a flowring pool index */
#define DHD_FLOWRINGS_POOL_OFFSET(flowid) \
        ((flowid) - BCMPCIE_H2D_COMMON_MSGRINGS)

/* Fetch the msgbuf_ring_t from the flowring pool given a flowid */
#define DHD_RING_IN_FLOWRINGS_POOL(prot, flowid) \
        (msgbuf_ring_t*)((prot)->h2d_flowrings_pool) + \
            DHD_FLOWRINGS_POOL_OFFSET(flowid)

/* Traverse each flowring in the flowring pool, assigning ring and flowid */
#define FOREACH_RING_IN_FLOWRINGS_POOL(prot, ring, flowid, total_flowrings) \
        for ((flowid) = DHD_FLOWRING_START_FLOWID, \
                (ring) = DHD_RING_IN_FLOWRINGS_POOL(prot, flowid); \
                 (flowid) < ((total_flowrings) + DHD_FLOWRING_START_FLOWID); \
                 (ring)++, (flowid)++)

/* Fetch number of H2D flowrings given the total number of h2d rings */
static uint16
dhd_get_max_flow_rings(dhd_pub_t *dhd)
{
        if (dhd->bus->api.fw_rev >= PCIE_SHARED_VERSION_6)
                return dhd->bus->max_tx_flowrings;
        else
                return (dhd->bus->max_tx_flowrings - BCMPCIE_H2D_COMMON_MSGRINGS);
}

/**
 * dhd_prot_flowrings_pool_attach - Initialize a pool of flowring msgbuf_ring_t.
 *
 * Allocate a pool of msgbuf_ring along with DMA-able buffers for flowrings.
 * Dongle includes common rings when it advertizes the number of H2D rings.
 * Allocates a pool of msgbuf_ring_t and invokes dhd_prot_ring_attach to
 * allocate the DMA-able buffer and initialize each msgbuf_ring_t object.
 *
 * dhd_prot_ring_attach is invoked to perform the actual initialization and
 * attaching the DMA-able buffer.
 *
 * Later dhd_prot_flowrings_pool_fetch() may be used to fetch a preallocated and
 * initialized msgbuf_ring_t object.
 *
 * returns BCME_OK=0 on success
 * returns non-zero negative error value on failure.
 */
static int
dhd_prot_flowrings_pool_attach(dhd_pub_t *dhd)
{
        uint16 flowid;
        msgbuf_ring_t *ring;
        uint16 h2d_flowrings_total; /* exclude H2D common rings */
        dhd_prot_t *prot = dhd->prot;
        char ring_name[RING_NAME_MAX_LENGTH];

        if (prot->h2d_flowrings_pool != NULL)
                return BCME_OK; /* dhd_prot_init rentry after a dhd_prot_reset */

        ASSERT(prot->h2d_rings_total == 0);

        /* h2d_rings_total includes H2D common rings: ctrl and rxbuf subn */
        prot->h2d_rings_total = (uint16)dhd_bus_max_h2d_queues(dhd->bus);

        if (prot->h2d_rings_total < BCMPCIE_H2D_COMMON_MSGRINGS) {
                DHD_ERROR(("%s: h2d_rings_total advertized as %u\n",
                        __FUNCTION__, prot->h2d_rings_total));
                return BCME_ERROR;
        }

        /* Subtract number of H2D common rings, to determine number of flowrings */
        h2d_flowrings_total = dhd_get_max_flow_rings(dhd);

        DHD_ERROR(("Attach flowrings pool for %d rings\n", h2d_flowrings_total));

        /* Allocate pool of msgbuf_ring_t objects for all flowrings */
        prot->h2d_flowrings_pool = (msgbuf_ring_t *)MALLOCZ(prot->osh,
                (h2d_flowrings_total * sizeof(msgbuf_ring_t)));

        if (prot->h2d_flowrings_pool == NULL) {
                DHD_ERROR(("%s: flowrings pool for %d flowrings, alloc failure\n",
                        __FUNCTION__, h2d_flowrings_total));
                goto fail;
        }

        /* Setup & Attach a DMA-able buffer to each flowring in the flowring pool */
        FOREACH_RING_IN_FLOWRINGS_POOL(prot, ring, flowid, h2d_flowrings_total) {
                snprintf(ring_name, sizeof(ring_name), "h2dflr_%03u", flowid);
                if (dhd_prot_ring_attach(dhd, ring, ring_name,
                        prot->h2d_max_txpost, H2DRING_TXPOST_ITEMSIZE,
                        DHD_FLOWID_TO_RINGID(flowid)) != BCME_OK) {
                        goto attach_fail;
                }
        }

        return BCME_OK;

attach_fail:
        dhd_prot_flowrings_pool_detach(dhd); /* Free entire pool of flowrings */

fail:
        prot->h2d_rings_total = 0;
        return BCME_NOMEM;

} /* dhd_prot_flowrings_pool_attach */

/**
 * dhd_prot_flowrings_pool_reset - Reset all msgbuf_ring_t objects in the pool.
 * Invokes dhd_prot_ring_reset to perform the actual reset.
 *
 * The DMA-able buffer is not freed during reset and neither is the flowring
 * pool freed.
 *
 * dhd_prot_flowrings_pool_reset will be invoked in dhd_prot_reset. Following
 * the dhd_prot_reset, dhd_prot_init will be re-invoked, and the flowring pool
 * from a previous flowring pool instantiation will be reused.
 *
 * This will avoid a fragmented DMA-able memory condition, if multiple
 * dhd_prot_reset were invoked to reboot the dongle without a full detach/attach
 * cycle.
 */
static void
dhd_prot_flowrings_pool_reset(dhd_pub_t *dhd)
{
        uint16 flowid, h2d_flowrings_total;
        msgbuf_ring_t *ring;
        dhd_prot_t *prot = dhd->prot;

        if (prot->h2d_flowrings_pool == NULL) {
                ASSERT(prot->h2d_rings_total == 0);
                return;
        }
        h2d_flowrings_total = dhd_get_max_flow_rings(dhd);
        /* Reset each flowring in the flowring pool */
        FOREACH_RING_IN_FLOWRINGS_POOL(prot, ring, flowid, h2d_flowrings_total) {
                dhd_prot_ring_reset(dhd, ring);
                ring->inited = FALSE;
        }

        /* Flowring pool state must be as-if dhd_prot_flowrings_pool_attach */
}

/**
 * dhd_prot_flowrings_pool_detach - Free pool of msgbuf_ring along with
 * DMA-able buffers for flowrings.
 * dhd_prot_ring_detach is invoked to free the DMA-able buffer and perform any
 * de-initialization of each msgbuf_ring_t.
 */
static void
dhd_prot_flowrings_pool_detach(dhd_pub_t *dhd)
{
        int flowid;
        msgbuf_ring_t *ring;
        uint16 h2d_flowrings_total; /* exclude H2D common rings */
        dhd_prot_t *prot = dhd->prot;

        if (prot->h2d_flowrings_pool == NULL) {
                ASSERT(prot->h2d_rings_total == 0);
                return;
        }

        h2d_flowrings_total = dhd_get_max_flow_rings(dhd);
        /* Detach the DMA-able buffer for each flowring in the flowring pool */
        FOREACH_RING_IN_FLOWRINGS_POOL(prot, ring, flowid, h2d_flowrings_total) {
                dhd_prot_ring_detach(dhd, ring);
        }

        MFREE(prot->osh, prot->h2d_flowrings_pool,
                (h2d_flowrings_total * sizeof(msgbuf_ring_t)));

        prot->h2d_flowrings_pool = (msgbuf_ring_t*)NULL;
        prot->h2d_rings_total = 0;

} /* dhd_prot_flowrings_pool_detach */

/**
 * dhd_prot_flowrings_pool_fetch - Fetch a preallocated and initialized
 * msgbuf_ring from the flowring pool, and assign it.
 *
 * Unlike common rings, which uses a dhd_prot_ring_init() to pass the common
 * ring information to the dongle, a flowring's information is passed via a
 * flowring create control message.
 *
 * Only the ring state (WR, RD) index are initialized.
 */
static msgbuf_ring_t *
dhd_prot_flowrings_pool_fetch(dhd_pub_t *dhd, uint16 flowid)
{
        msgbuf_ring_t *ring;
        dhd_prot_t *prot = dhd->prot;

        ASSERT(flowid >= DHD_FLOWRING_START_FLOWID);
        ASSERT(flowid < prot->h2d_rings_total);
        ASSERT(prot->h2d_flowrings_pool != NULL);

        ring = DHD_RING_IN_FLOWRINGS_POOL(prot, flowid);

        /* ASSERT flow_ring->inited == FALSE */

        ring->wr = 0;
        ring->rd = 0;
        ring->curr_rd = 0;
        ring->inited = TRUE;
        /**
         * Every time a flowring starts dynamically, initialize current_phase with 0
         * then flip to BCMPCIE_CMNHDR_PHASE_BIT_INIT
         */
        ring->current_phase = 0;
        return ring;
}

/**
 * dhd_prot_flowrings_pool_release - release a previously fetched flowring's
 * msgbuf_ring back to the flow_ring pool.
 */
void
dhd_prot_flowrings_pool_release(dhd_pub_t *dhd, uint16 flowid, void *flow_ring)
{
        msgbuf_ring_t *ring;
        dhd_prot_t *prot = dhd->prot;

        ASSERT(flowid >= DHD_FLOWRING_START_FLOWID);
        ASSERT(flowid < prot->h2d_rings_total);
        ASSERT(prot->h2d_flowrings_pool != NULL);

        ring = DHD_RING_IN_FLOWRINGS_POOL(prot, flowid);

        ASSERT(ring == (msgbuf_ring_t*)flow_ring);
        /* ASSERT flow_ring->inited == TRUE */

        (void)dhd_dma_buf_audit(dhd, &ring->dma_buf);

        ring->wr = 0;
        ring->rd = 0;
        ring->inited = FALSE;

        ring->curr_rd = 0;
}

/* Assumes only one index is updated at a time */
/* If exactly_nitems is true, this function will allocate space for nitems or fail */
/*    Exception: when wrap around is encountered, to prevent hangup (last nitems of ring buffer) */
/* If exactly_nitems is false, this function will allocate space for nitems or less */
static void *BCMFASTPATH
dhd_prot_get_ring_space(msgbuf_ring_t *ring, uint16 nitems, uint16 * alloced,
        bool exactly_nitems)
{
        void *ret_ptr = NULL;
        uint16 ring_avail_cnt;

        ASSERT(nitems <= ring->max_items);

        ring_avail_cnt = CHECK_WRITE_SPACE(ring->rd, ring->wr, ring->max_items);

        if ((ring_avail_cnt == 0) ||
               (exactly_nitems && (ring_avail_cnt < nitems) &&
               ((ring->max_items - ring->wr) >= nitems))) {
                DHD_INFO(("Space not available: ring %s items %d write %d read %d\n",
                        ring->name, nitems, ring->wr, ring->rd));
                return NULL;
        }
        *alloced = MIN(nitems, ring_avail_cnt);

        /* Return next available space */
        ret_ptr = (char *)DHD_RING_BGN_VA(ring) + (ring->wr * ring->item_len);

        /* Update write index */
        if ((ring->wr + *alloced) == ring->max_items)
                ring->wr = 0;
        else if ((ring->wr + *alloced) < ring->max_items)
                ring->wr += *alloced;
        else {
                /* Should never hit this */
                ASSERT(0);
                return NULL;
        }

        return ret_ptr;
} /* dhd_prot_get_ring_space */

/**
 * dhd_prot_ring_write_complete - Host updates the new WR index on producing
 * new messages in a H2D ring. The messages are flushed from cache prior to
 * posting the new WR index. The new WR index will be updated in the DMA index
 * array or directly in the dongle's ring state memory.
 * A PCIE doorbell will be generated to wake up the dongle.
 * This is a non-atomic function, make sure the callers
 * always hold appropriate locks.
 */
static void BCMFASTPATH
__dhd_prot_ring_write_complete(dhd_pub_t *dhd, msgbuf_ring_t * ring, void* p,
        uint16 nitems)
{
        dhd_prot_t *prot = dhd->prot;
        uint32 db_index;
        uint16 max_flowrings = dhd->bus->max_tx_flowrings;
        uint corerev;

        /* cache flush */
        OSL_CACHE_FLUSH(p, ring->item_len * nitems);

        if (IDMA_ACTIVE(dhd) || dhd->dma_h2d_ring_upd_support) {
                        dhd_prot_dma_indx_set(dhd, ring->wr,
                                              H2D_DMA_INDX_WR_UPD, ring->idx);
        } else if (IFRM_ACTIVE(dhd) && DHD_IS_FLOWRING(ring->idx, max_flowrings)) {
                        dhd_prot_dma_indx_set(dhd, ring->wr,
                        H2D_IFRM_INDX_WR_UPD, ring->idx);
        } else {
                        dhd_bus_cmn_writeshared(dhd->bus, &(ring->wr),
                                sizeof(uint16), RING_WR_UPD, ring->idx);
        }

        /* raise h2d interrupt */
        if (IDMA_ACTIVE(dhd) ||
                (IFRM_ACTIVE(dhd) && DHD_IS_FLOWRING(ring->idx, max_flowrings))) {
                db_index = IDMA_IDX0;
                /* this api is called in wl down path..in that case sih is freed already */
                if (dhd->bus->sih) {
                        corerev = dhd->bus->sih->buscorerev;
                        /* We need to explictly configure the type of DMA for core rev >= 24 */
                        if (corerev >= 24) {
                                db_index |= (DMA_TYPE_IDMA << DMA_TYPE_SHIFT);
                        }
                }
                prot->mb_2_ring_fn(dhd->bus, db_index, TRUE);
        } else {
                prot->mb_ring_fn(dhd->bus, ring->wr);
        }
}

static void BCMFASTPATH
dhd_prot_ring_write_complete(dhd_pub_t *dhd, msgbuf_ring_t * ring, void* p,
        uint16 nitems)
{
        unsigned long flags_bus;
        DHD_BUS_LOCK(dhd->bus->bus_lock, flags_bus);
        __dhd_prot_ring_write_complete(dhd, ring, p, nitems);
        DHD_BUS_UNLOCK(dhd->bus->bus_lock, flags_bus);
}

/**
 * dhd_prot_ring_write_complete_mbdata - will be called from dhd_prot_h2d_mbdata_send_ctrlmsg,
 * which will hold DHD_BUS_LOCK to update WR pointer, Ring DB and also update bus_low_power_state
 * to indicate D3_INFORM sent in the same BUS_LOCK.
 */
static void BCMFASTPATH
dhd_prot_ring_write_complete_mbdata(dhd_pub_t *dhd, msgbuf_ring_t * ring, void *p,
        uint16 nitems, uint32 mb_data)
{
        unsigned long flags_bus;

        DHD_BUS_LOCK(dhd->bus->bus_lock, flags_bus);

        __dhd_prot_ring_write_complete(dhd, ring, p, nitems);

        /* Mark D3_INFORM in the same context to skip ringing H2D DB after D3_INFORM */
        if (mb_data == H2D_HOST_D3_INFORM) {
                dhd->bus->bus_low_power_state = DHD_BUS_D3_INFORM_SENT;
        }

        DHD_BUS_UNLOCK(dhd->bus->bus_lock, flags_bus);
}

/**
 * dhd_prot_upd_read_idx - Host updates the new RD index on consuming messages
 * from a D2H ring. The new RD index will be updated in the DMA Index array or
 * directly in dongle's ring state memory.
 */
static void
dhd_prot_upd_read_idx(dhd_pub_t *dhd, msgbuf_ring_t * ring)
{
        dhd_prot_t *prot = dhd->prot;
        uint32 db_index;
        uint corerev;

        /* update read index */
        /* If dma'ing h2d indices supported
         * update the r -indices in the
         * host memory o/w in TCM
         */
        if (IDMA_ACTIVE(dhd)) {
                dhd_prot_dma_indx_set(dhd, ring->rd,
                                      D2H_DMA_INDX_RD_UPD, ring->idx);
                db_index = IDMA_IDX1;
                if (dhd->bus->sih) {
                        corerev = dhd->bus->sih->buscorerev;
                        /* We need to explictly configure the type of DMA for core rev >= 24 */
                        if (corerev >= 24) {
                                db_index |= (DMA_TYPE_IDMA << DMA_TYPE_SHIFT);
                        }
                }
                prot->mb_2_ring_fn(dhd->bus, db_index, FALSE);
        } else if (dhd->dma_h2d_ring_upd_support) {
                dhd_prot_dma_indx_set(dhd, ring->rd,
                                      D2H_DMA_INDX_RD_UPD, ring->idx);
        } else {
                dhd_bus_cmn_writeshared(dhd->bus, &(ring->rd),
                        sizeof(uint16), RING_RD_UPD, ring->idx);
        }
}

static int
dhd_send_d2h_ringcreate(dhd_pub_t *dhd, msgbuf_ring_t *ring_to_create,
        uint16 ring_type, uint32 req_id)
{
        unsigned long flags;
        d2h_ring_create_req_t  *d2h_ring;
        uint16 alloced = 0;
        int ret = BCME_OK;
        uint16 max_h2d_rings = dhd->bus->max_submission_rings;
        msgbuf_ring_t *ctrl_ring = &dhd->prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);

        DHD_TRACE(("%s trying to send D2H ring create Req\n", __FUNCTION__));

        if (ring_to_create == NULL) {
                DHD_ERROR(("%s: FATAL: ring_to_create is NULL\n", __FUNCTION__));
                ret = BCME_ERROR;
                goto err;
        }

        /* Request for ring buffer space */
        d2h_ring = (d2h_ring_create_req_t *) dhd_prot_alloc_ring_space(dhd,
                ctrl_ring, DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D,
                &alloced, FALSE);

        if (d2h_ring == NULL) {
                DHD_ERROR(("%s: FATAL: No space in control ring to send D2H ring create\n",
                        __FUNCTION__));
                ret = BCME_NOMEM;
                goto err;
        }
        ring_to_create->create_req_id = (uint16)req_id;
        ring_to_create->create_pending = TRUE;

        /* Common msg buf hdr */
        d2h_ring->msg.msg_type = MSG_TYPE_D2H_RING_CREATE;
        d2h_ring->msg.if_id = 0;
        d2h_ring->msg.flags = ctrl_ring->current_phase;
        d2h_ring->msg.request_id = htol32(ring_to_create->create_req_id);
        d2h_ring->ring_id = htol16(DHD_D2H_RING_OFFSET(ring_to_create->idx, max_h2d_rings));
        d2h_ring->ring_type = ring_type;
        d2h_ring->max_items = htol16(D2HRING_DYNAMIC_INFO_MAX_ITEM);
        d2h_ring->len_item = htol16(D2HRING_INFO_BUFCMPLT_ITEMSIZE);
        d2h_ring->ring_ptr.low_addr = ring_to_create->base_addr.low_addr;
        d2h_ring->ring_ptr.high_addr = ring_to_create->base_addr.high_addr;

        d2h_ring->flags = 0;
        d2h_ring->msg.epoch =
                ctrl_ring->seqnum % H2D_EPOCH_MODULO;
        ctrl_ring->seqnum++;

        /* Update the flow_ring's WRITE index */
        dhd_prot_ring_write_complete(dhd, ctrl_ring, d2h_ring,
                DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return ret;
err:
        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return ret;
}

static int
dhd_send_h2d_ringcreate(dhd_pub_t *dhd, msgbuf_ring_t *ring_to_create, uint8 ring_type, uint32 id)
{
        unsigned long flags;
        h2d_ring_create_req_t  *h2d_ring;
        uint16 alloced = 0;
        uint8 i = 0;
        int ret = BCME_OK;
        msgbuf_ring_t *ctrl_ring = &dhd->prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);

        DHD_TRACE(("%s trying to send H2D ring create Req\n", __FUNCTION__));

        if (ring_to_create == NULL) {
                DHD_ERROR(("%s: FATAL: ring_to_create is NULL\n", __FUNCTION__));
                ret = BCME_ERROR;
                goto err;
        }

        /* Request for ring buffer space */
        h2d_ring = (h2d_ring_create_req_t *)dhd_prot_alloc_ring_space(dhd,
                ctrl_ring, DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D,
                &alloced, FALSE);

        if (h2d_ring == NULL) {
                DHD_ERROR(("%s: FATAL: No space in control ring to send H2D ring create\n",
                        __FUNCTION__));
                ret = BCME_NOMEM;
                goto err;
        }
        ring_to_create->create_req_id = (uint16)id;
        ring_to_create->create_pending = TRUE;

        /* Common msg buf hdr */
        h2d_ring->msg.msg_type = MSG_TYPE_H2D_RING_CREATE;
        h2d_ring->msg.if_id = 0;
        h2d_ring->msg.request_id = htol32(ring_to_create->create_req_id);
        h2d_ring->msg.flags = ctrl_ring->current_phase;
        h2d_ring->ring_id = htol16(DHD_H2D_RING_OFFSET(ring_to_create->idx));
        h2d_ring->ring_type = ring_type;
        h2d_ring->max_items = htol16(H2DRING_DYNAMIC_INFO_MAX_ITEM);
        h2d_ring->n_completion_ids = ring_to_create->n_completion_ids;
        h2d_ring->len_item = htol16(H2DRING_INFO_BUFPOST_ITEMSIZE);
        h2d_ring->ring_ptr.low_addr = ring_to_create->base_addr.low_addr;
        h2d_ring->ring_ptr.high_addr = ring_to_create->base_addr.high_addr;

        for (i = 0; i < ring_to_create->n_completion_ids; i++) {
                h2d_ring->completion_ring_ids[i] = htol16(ring_to_create->compeltion_ring_ids[i]);
        }

        h2d_ring->flags = 0;
        h2d_ring->msg.epoch =
                ctrl_ring->seqnum % H2D_EPOCH_MODULO;
        ctrl_ring->seqnum++;

        /* Update the flow_ring's WRITE index */
        dhd_prot_ring_write_complete(dhd, ctrl_ring, h2d_ring,
                DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return ret;
err:
        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return ret;
}

/**
 * dhd_prot_dma_indx_set - set a new WR or RD index in the DMA index array.
 * Dongle will DMA the entire array (if DMA_INDX feature is enabled).
 * See dhd_prot_dma_indx_init()
 */
void
dhd_prot_dma_indx_set(dhd_pub_t *dhd, uint16 new_index, uint8 type, uint16 ringid)
{
        uint8 *ptr;
        uint16 offset;
        dhd_prot_t *prot = dhd->prot;
        uint16 max_h2d_rings = dhd->bus->max_submission_rings;

        switch (type) {
                case H2D_DMA_INDX_WR_UPD:
                        ptr = (uint8 *)(prot->h2d_dma_indx_wr_buf.va);
                        offset = DHD_H2D_RING_OFFSET(ringid);
                        break;

                case D2H_DMA_INDX_RD_UPD:
                        ptr = (uint8 *)(prot->d2h_dma_indx_rd_buf.va);
                        offset = DHD_D2H_RING_OFFSET(ringid, max_h2d_rings);
                        break;

                case H2D_IFRM_INDX_WR_UPD:
                        ptr = (uint8 *)(prot->h2d_ifrm_indx_wr_buf.va);
                        offset = DHD_H2D_FRM_FLOW_RING_OFFSET(ringid);
                        break;

                default:
                        DHD_ERROR(("%s: Invalid option for DMAing read/write index\n",
                                __FUNCTION__));
                        return;
        }

        ASSERT(prot->rw_index_sz != 0);
        ptr += offset * prot->rw_index_sz;

        *(uint16*)ptr = htol16(new_index);

        OSL_CACHE_FLUSH((void *)ptr, prot->rw_index_sz);

        DHD_TRACE(("%s: data %d type %d ringid %d ptr 0x%p offset %d\n",
                __FUNCTION__, new_index, type, ringid, ptr, offset));

} /* dhd_prot_dma_indx_set */

/**
 * dhd_prot_dma_indx_get - Fetch a WR or RD index from the dongle DMA-ed index
 * array.
 * Dongle DMAes an entire array to host memory (if the feature is enabled).
 * See dhd_prot_dma_indx_init()
 */
static uint16
dhd_prot_dma_indx_get(dhd_pub_t *dhd, uint8 type, uint16 ringid)
{
        uint8 *ptr;
        uint16 data;
        uint16 offset;
        dhd_prot_t *prot = dhd->prot;
        uint16 max_h2d_rings = dhd->bus->max_submission_rings;

        switch (type) {
                case H2D_DMA_INDX_WR_UPD:
                        ptr = (uint8 *)(prot->h2d_dma_indx_wr_buf.va);
                        offset = DHD_H2D_RING_OFFSET(ringid);
                        break;

                case H2D_DMA_INDX_RD_UPD:
                        ptr = (uint8 *)(prot->h2d_dma_indx_rd_buf.va);
                        offset = DHD_H2D_RING_OFFSET(ringid);
                        break;

                case D2H_DMA_INDX_WR_UPD:
                        ptr = (uint8 *)(prot->d2h_dma_indx_wr_buf.va);
                        offset = DHD_D2H_RING_OFFSET(ringid, max_h2d_rings);
                        break;

                case D2H_DMA_INDX_RD_UPD:
                        ptr = (uint8 *)(prot->d2h_dma_indx_rd_buf.va);
                        offset = DHD_D2H_RING_OFFSET(ringid, max_h2d_rings);
                        break;

                default:
                        DHD_ERROR(("%s: Invalid option for DMAing read/write index\n",
                                __FUNCTION__));
                        return 0;
        }

        ASSERT(prot->rw_index_sz != 0);
        ptr += offset * prot->rw_index_sz;

        OSL_CACHE_INV((void *)ptr, prot->rw_index_sz);

        data = LTOH16(*((uint16*)ptr));

        DHD_TRACE(("%s: data %d type %d ringid %d ptr 0x%p offset %d\n",
                __FUNCTION__, data, type, ringid, ptr, offset));

        return (data);

} /* dhd_prot_dma_indx_get */

/**
 * An array of DMA read/write indices, containing information about host rings, can be maintained
 * either in host memory or in device memory, dependent on preprocessor options. This function is,
 * dependent on these options, called during driver initialization. It reserves and initializes
 * blocks of DMA'able host memory containing an array of DMA read or DMA write indices. The physical
 * address of these host memory blocks are communicated to the dongle later on. By reading this host
 * memory, the dongle learns about the state of the host rings.
 */

static INLINE int
dhd_prot_dma_indx_alloc(dhd_pub_t *dhd, uint8 type,
        dhd_dma_buf_t *dma_buf, uint32 bufsz)
{
        int rc;

        if ((dma_buf->len == bufsz) || (dma_buf->va != NULL))
                return BCME_OK;

        rc = dhd_dma_buf_alloc(dhd, dma_buf, bufsz);

        return rc;
}

int
dhd_prot_dma_indx_init(dhd_pub_t *dhd, uint32 rw_index_sz, uint8 type, uint32 length)
{
        uint32 bufsz;
        dhd_prot_t *prot = dhd->prot;
        dhd_dma_buf_t *dma_buf;

        if (prot == NULL) {
                DHD_ERROR(("prot is not inited\n"));
                return BCME_ERROR;
        }

        /* Dongle advertizes 2B or 4B RW index size */
        ASSERT(rw_index_sz != 0);
        prot->rw_index_sz = rw_index_sz;

        bufsz = rw_index_sz * length;

        switch (type) {
                case H2D_DMA_INDX_WR_BUF:
                        dma_buf = &prot->h2d_dma_indx_wr_buf;
                        if (dhd_prot_dma_indx_alloc(dhd, type, dma_buf, bufsz))
                                goto ret_no_mem;
                        DHD_ERROR(("H2D DMA WR INDX : array size %d = %d * %d\n",
                                dma_buf->len, rw_index_sz, length));
                        break;

                case H2D_DMA_INDX_RD_BUF:
                        dma_buf = &prot->h2d_dma_indx_rd_buf;
                        if (dhd_prot_dma_indx_alloc(dhd, type, dma_buf, bufsz))
                                goto ret_no_mem;
                        DHD_ERROR(("H2D DMA RD INDX : array size %d = %d * %d\n",
                                dma_buf->len, rw_index_sz, length));
                        break;

                case D2H_DMA_INDX_WR_BUF:
                        dma_buf = &prot->d2h_dma_indx_wr_buf;
                        if (dhd_prot_dma_indx_alloc(dhd, type, dma_buf, bufsz))
                                goto ret_no_mem;
                        DHD_ERROR(("D2H DMA WR INDX : array size %d = %d * %d\n",
                                dma_buf->len, rw_index_sz, length));
                        break;

                case D2H_DMA_INDX_RD_BUF:
                        dma_buf = &prot->d2h_dma_indx_rd_buf;
                        if (dhd_prot_dma_indx_alloc(dhd, type, dma_buf, bufsz))
                                goto ret_no_mem;
                        DHD_ERROR(("D2H DMA RD INDX : array size %d = %d * %d\n",
                                dma_buf->len, rw_index_sz, length));
                        break;

                case H2D_IFRM_INDX_WR_BUF:
                        dma_buf = &prot->h2d_ifrm_indx_wr_buf;
                        if (dhd_prot_dma_indx_alloc(dhd, type, dma_buf, bufsz))
                                goto ret_no_mem;
                        DHD_ERROR(("H2D IFRM WR INDX : array size %d = %d * %d\n",
                                dma_buf->len, rw_index_sz, length));
                        break;

                default:
                        DHD_ERROR(("%s: Unexpected option\n", __FUNCTION__));
                        return BCME_BADOPTION;
        }

        return BCME_OK;

ret_no_mem:
        DHD_ERROR(("%s: dhd_prot_dma_indx_alloc type %d buf_sz %d failure\n",
                __FUNCTION__, type, bufsz));
        return BCME_NOMEM;

} /* dhd_prot_dma_indx_init */

/**
 * Called on checking for 'completion' messages from the dongle. Returns next host buffer to read
 * from, or NULL if there are no more messages to read.
 */
static uint8*
dhd_prot_get_read_addr(dhd_pub_t *dhd, msgbuf_ring_t *ring, uint32 *available_len)
{
        uint16 wr;
        uint16 rd;
        uint16 depth;
        uint16 items;
        void  *read_addr = NULL; /* address of next msg to be read in ring */
        uint16 d2h_wr = 0;

        DHD_TRACE(("%s: d2h_dma_indx_rd_buf %p, d2h_dma_indx_wr_buf %p\n",
                __FUNCTION__, (uint32 *)(dhd->prot->d2h_dma_indx_rd_buf.va),
                (uint32 *)(dhd->prot->d2h_dma_indx_wr_buf.va)));

        /* Remember the read index in a variable.
         * This is becuase ring->rd gets updated in the end of this function
         * So if we have to print the exact read index from which the
         * message is read its not possible.
         */
        ring->curr_rd = ring->rd;

        /* update write pointer */
        if (dhd->dma_d2h_ring_upd_support) {
                /* DMAing write/read indices supported */
                d2h_wr = dhd_prot_dma_indx_get(dhd, D2H_DMA_INDX_WR_UPD, ring->idx);
                ring->wr = d2h_wr;
        } else {
                dhd_bus_cmn_readshared(dhd->bus, &(ring->wr), RING_WR_UPD, ring->idx);
        }

        wr = ring->wr;
        rd = ring->rd;
        depth = ring->max_items;

        /* check for avail space, in number of ring items */
        items = READ_AVAIL_SPACE(wr, rd, depth);
        if (items == 0)
                return NULL;

        /*
         * Note that there are builds where Assert translates to just printk
         * so, even if we had hit this condition we would never halt. Now
         * dhd_prot_process_msgtype can get into an big loop if this
         * happens.
         */
        if (items > ring->max_items) {
                DHD_ERROR(("\r\n======================= \r\n"));
                DHD_ERROR(("%s(): ring %p, ring->name %s, ring->max_items %d, items %d \r\n",
                        __FUNCTION__, ring, ring->name, ring->max_items, items));
                DHD_ERROR(("wr: %d,  rd: %d,  depth: %d  \r\n", wr, rd, depth));
                DHD_ERROR(("dhd->busstate %d bus->wait_for_d3_ack %d \r\n",
                        dhd->busstate, dhd->bus->wait_for_d3_ack));
                DHD_ERROR(("\r\n======================= \r\n"));
#ifdef SUPPORT_LINKDOWN_RECOVERY
                if (wr >= ring->max_items) {
                        dhd->bus->read_shm_fail = TRUE;
                }
#else
#ifdef DHD_FW_COREDUMP
                if (dhd->memdump_enabled) {
                        /* collect core dump */
                        dhd->memdump_type = DUMP_TYPE_RESUMED_ON_INVALID_RING_RDWR;
                        dhd_bus_mem_dump(dhd);

                }
#endif /* DHD_FW_COREDUMP */
#endif /* SUPPORT_LINKDOWN_RECOVERY */

                *available_len = 0;
                dhd_schedule_reset(dhd);

                return NULL;
        }

        /* if space is available, calculate address to be read */
        read_addr = (char*)ring->dma_buf.va + (rd * ring->item_len);

        /* update read pointer */
        if ((ring->rd + items) >= ring->max_items)
                ring->rd = 0;
        else
                ring->rd += items;

        ASSERT(ring->rd < ring->max_items);

        /* convert items to bytes : available_len must be 32bits */
        *available_len = (uint32)(items * ring->item_len);

        OSL_CACHE_INV(read_addr, *available_len);

        /* return read address */
        return read_addr;

} /* dhd_prot_get_read_addr */

/**
 * dhd_prot_h2d_mbdata_send_ctrlmsg is a non-atomic function,
 * make sure the callers always hold appropriate locks.
 */
int dhd_prot_h2d_mbdata_send_ctrlmsg(dhd_pub_t *dhd, uint32 mb_data)
{
        h2d_mailbox_data_t *h2d_mb_data;
        uint16 alloced = 0;
        msgbuf_ring_t *ctrl_ring = &dhd->prot->h2dring_ctrl_subn;
        unsigned long flags;
        int num_post = 1;
        int i;

        DHD_INFO(("%s Sending H2D MB data Req data 0x%04x\n",
                __FUNCTION__, mb_data));
        if (!ctrl_ring->inited) {
                DHD_ERROR(("%s: Ctrl Submit Ring: not inited\n", __FUNCTION__));
                return BCME_ERROR;
        }

        for (i = 0; i < num_post; i ++) {
                DHD_RING_LOCK(ctrl_ring->ring_lock, flags);
                /* Request for ring buffer space */
                h2d_mb_data = (h2d_mailbox_data_t *)dhd_prot_alloc_ring_space(dhd,
                        ctrl_ring, DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D,
                        &alloced, FALSE);

                if (h2d_mb_data == NULL) {
                        DHD_ERROR(("%s: FATAL: No space in control ring to send H2D Mb data\n",
                                __FUNCTION__));
                        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);
                        return BCME_NOMEM;
                }

                memset(h2d_mb_data, 0, sizeof(h2d_mailbox_data_t));
                /* Common msg buf hdr */
                h2d_mb_data->msg.msg_type = MSG_TYPE_H2D_MAILBOX_DATA;
                h2d_mb_data->msg.flags = ctrl_ring->current_phase;

                h2d_mb_data->msg.epoch =
                        ctrl_ring->seqnum % H2D_EPOCH_MODULO;
                ctrl_ring->seqnum++;

                /* Update flow create message */
                h2d_mb_data->mail_box_data = htol32(mb_data);
                {
                        h2d_mb_data->mail_box_data = htol32(mb_data);
                }

                DHD_INFO(("%s Send H2D MB data Req data 0x%04x\n", __FUNCTION__, mb_data));

                /* upd wrt ptr and raise interrupt */
                dhd_prot_ring_write_complete_mbdata(dhd, ctrl_ring, h2d_mb_data,
                        DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D, mb_data);

                DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        }
        return 0;
}

/** Creates a flow ring and informs dongle of this event */
int
dhd_prot_flow_ring_create(dhd_pub_t *dhd, flow_ring_node_t *flow_ring_node)
{
        tx_flowring_create_request_t *flow_create_rqst;
        msgbuf_ring_t *flow_ring;
        dhd_prot_t *prot = dhd->prot;
        unsigned long flags;
        uint16 alloced = 0;
        msgbuf_ring_t *ctrl_ring = &prot->h2dring_ctrl_subn;
        uint16 max_flowrings = dhd->bus->max_tx_flowrings;

        /* Fetch a pre-initialized msgbuf_ring from the flowring pool */
        flow_ring = dhd_prot_flowrings_pool_fetch(dhd, flow_ring_node->flowid);
        if (flow_ring == NULL) {
                DHD_ERROR(("%s: dhd_prot_flowrings_pool_fetch TX Flowid %d failed\n",
                        __FUNCTION__, flow_ring_node->flowid));
                return BCME_NOMEM;
        }

        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);

        /* Request for ctrl_ring buffer space */
        flow_create_rqst = (tx_flowring_create_request_t *)
                dhd_prot_alloc_ring_space(dhd, ctrl_ring, 1, &alloced, FALSE);

        if (flow_create_rqst == NULL) {
                dhd_prot_flowrings_pool_release(dhd, flow_ring_node->flowid, flow_ring);
                DHD_ERROR(("%s: Flow Create Req flowid %d - failure ring space\n",
                        __FUNCTION__, flow_ring_node->flowid));
                DHD_RING_LOCK(ctrl_ring->ring_lock, flags);
                return BCME_NOMEM;
        }

        flow_ring_node->prot_info = (void *)flow_ring;

        /* Common msg buf hdr */
        flow_create_rqst->msg.msg_type = MSG_TYPE_FLOW_RING_CREATE;
        flow_create_rqst->msg.if_id = (uint8)flow_ring_node->flow_info.ifindex;
        flow_create_rqst->msg.request_id = htol32(0); /* TBD */
        flow_create_rqst->msg.flags = ctrl_ring->current_phase;

        flow_create_rqst->msg.epoch = ctrl_ring->seqnum % H2D_EPOCH_MODULO;
        ctrl_ring->seqnum++;

        /* Update flow create message */
        flow_create_rqst->tid = flow_ring_node->flow_info.tid;
        flow_create_rqst->flow_ring_id = htol16((uint16)flow_ring_node->flowid);
        memcpy(flow_create_rqst->sa, flow_ring_node->flow_info.sa, sizeof(flow_create_rqst->sa));
        memcpy(flow_create_rqst->da, flow_ring_node->flow_info.da, sizeof(flow_create_rqst->da));
        /* CAUTION: ring::base_addr already in Little Endian */
        flow_create_rqst->flow_ring_ptr.low_addr = flow_ring->base_addr.low_addr;
        flow_create_rqst->flow_ring_ptr.high_addr = flow_ring->base_addr.high_addr;
        flow_create_rqst->max_items = htol16(prot->h2d_max_txpost);
        flow_create_rqst->len_item = htol16(H2DRING_TXPOST_ITEMSIZE);

        /* definition for ifrm mask : bit0:d11ac core, bit1:d11ad core
         * currently it is not used for priority. so uses solely for ifrm mask
         */
        if (IFRM_ACTIVE(dhd))
                flow_create_rqst->priority_ifrmmask = (1 << IFRM_DEV_0);

        DHD_ERROR(("%s: Send Flow Create Req flow ID %d for peer " MACDBG
                " prio %d ifindex %d\n", __FUNCTION__, flow_ring_node->flowid,
                MAC2STRDBG(flow_ring_node->flow_info.da), flow_ring_node->flow_info.tid,
                flow_ring_node->flow_info.ifindex));

        /* Update the flow_ring's WRITE index */
        if (IDMA_ACTIVE(dhd) || dhd->dma_h2d_ring_upd_support) {
                dhd_prot_dma_indx_set(dhd, flow_ring->wr,
                                      H2D_DMA_INDX_WR_UPD, flow_ring->idx);
        } else if (IFRM_ACTIVE(dhd) && DHD_IS_FLOWRING(flow_ring->idx, max_flowrings)) {
                dhd_prot_dma_indx_set(dhd, flow_ring->wr,
                        H2D_IFRM_INDX_WR_UPD, flow_ring->idx);
        } else {
                dhd_bus_cmn_writeshared(dhd->bus, &(flow_ring->wr),
                        sizeof(uint16), RING_WR_UPD, flow_ring->idx);
        }

        /* update control subn ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ctrl_ring, flow_create_rqst, 1);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return BCME_OK;
} /* dhd_prot_flow_ring_create */

/** called on receiving MSG_TYPE_FLOW_RING_CREATE_CMPLT message from dongle */
static void
dhd_prot_flow_ring_create_response_process(dhd_pub_t *dhd, void *msg)
{
        tx_flowring_create_response_t *flow_create_resp = (tx_flowring_create_response_t *)msg;

        DHD_ERROR(("%s: Flow Create Response status = %d Flow %d\n", __FUNCTION__,
                ltoh16(flow_create_resp->cmplt.status),
                ltoh16(flow_create_resp->cmplt.flow_ring_id)));

        dhd_bus_flow_ring_create_response(dhd->bus,
                ltoh16(flow_create_resp->cmplt.flow_ring_id),
                ltoh16(flow_create_resp->cmplt.status));
}

static void
dhd_prot_process_h2d_ring_create_complete(dhd_pub_t *dhd, void *buf)
{
        h2d_ring_create_response_t *resp = (h2d_ring_create_response_t *)buf;
        DHD_INFO(("%s ring create Response status = %d ring %d, id 0x%04x\n", __FUNCTION__,
                ltoh16(resp->cmplt.status),
                ltoh16(resp->cmplt.ring_id),
                ltoh32(resp->cmn_hdr.request_id)));
        if ((ltoh32(resp->cmn_hdr.request_id) != DHD_H2D_DBGRING_REQ_PKTID) &&
                (ltoh32(resp->cmn_hdr.request_id) != DHD_H2D_BTLOGRING_REQ_PKTID)) {
                DHD_ERROR(("invalid request ID with h2d ring create complete\n"));
                return;
        }
        if (dhd->prot->h2dring_info_subn->create_req_id == ltoh32(resp->cmn_hdr.request_id) &&
                !dhd->prot->h2dring_info_subn->create_pending) {
                DHD_ERROR(("info ring create status for not pending submit ring\n"));
        }

        if (ltoh16(resp->cmplt.status) != BCMPCIE_SUCCESS) {
                DHD_ERROR(("info/btlog ring create failed with status %d\n",
                        ltoh16(resp->cmplt.status)));
                return;
        }
        if (dhd->prot->h2dring_info_subn->create_req_id == ltoh32(resp->cmn_hdr.request_id)) {
                dhd->prot->h2dring_info_subn->create_pending = FALSE;
                dhd->prot->h2dring_info_subn->inited = TRUE;
                DHD_ERROR(("info buffer post after ring create\n"));
                dhd_prot_infobufpost(dhd, dhd->prot->h2dring_info_subn);
        }
}

static void
dhd_prot_process_d2h_ring_create_complete(dhd_pub_t *dhd, void *buf)
{
        d2h_ring_create_response_t *resp = (d2h_ring_create_response_t *)buf;
        DHD_INFO(("%s ring create Response status = %d ring %d, id 0x%04x\n", __FUNCTION__,
                ltoh16(resp->cmplt.status),
                ltoh16(resp->cmplt.ring_id),
                ltoh32(resp->cmn_hdr.request_id)));
        if ((ltoh32(resp->cmn_hdr.request_id) != DHD_D2H_DBGRING_REQ_PKTID) &&
                (ltoh32(resp->cmn_hdr.request_id) != DHD_D2H_BTLOGRING_REQ_PKTID)) {
                DHD_ERROR(("invalid request ID with d2h ring create complete\n"));
                return;
        }
        if (ltoh32(resp->cmn_hdr.request_id) == DHD_D2H_DBGRING_REQ_PKTID) {
                if (!dhd->prot->d2hring_info_cpln->create_pending) {
                        DHD_ERROR(("info ring create status for not pending cpl ring\n"));
                        return;
                }

                if (ltoh16(resp->cmplt.status) != BCMPCIE_SUCCESS) {
                        DHD_ERROR(("info cpl ring create failed with status %d\n",
                                ltoh16(resp->cmplt.status)));
                        return;
                }
                dhd->prot->d2hring_info_cpln->create_pending = FALSE;
                dhd->prot->d2hring_info_cpln->inited = TRUE;
        }
}

static void
dhd_prot_process_d2h_mb_data(dhd_pub_t *dhd, void* buf)
{
        d2h_mailbox_data_t *d2h_data;

        d2h_data = (d2h_mailbox_data_t *)buf;
        DHD_INFO(("%s dhd_prot_process_d2h_mb_data, 0x%04x\n", __FUNCTION__,
                d2h_data->d2h_mailbox_data));
        dhd_bus_handle_mb_data(dhd->bus, d2h_data->d2h_mailbox_data);
}

static void
dhd_prot_process_d2h_host_ts_complete(dhd_pub_t *dhd, void* buf)
{
        DHD_ERROR(("Timesunc feature not compiled in but GOT HOST_TS_COMPLETE\n"));

}

/** called on e.g. flow ring delete */
void dhd_prot_clean_flow_ring(dhd_pub_t *dhd, void *msgbuf_flow_info)
{
        msgbuf_ring_t *flow_ring = (msgbuf_ring_t *)msgbuf_flow_info;
        dhd_prot_ring_detach(dhd, flow_ring);
        DHD_INFO(("%s Cleaning up Flow \n", __FUNCTION__));
}

void dhd_prot_print_flow_ring(dhd_pub_t *dhd, void *msgbuf_flow_info,
        struct bcmstrbuf *strbuf, const char * fmt)
{
        const char *default_fmt =
                "RD %d WR %d BASE(VA) %p BASE(PA) %x:%x SIZE %d "
                "WORK_ITEM_SIZE %d MAX_WORK_ITEMS %d TOTAL_SIZE %d\n";
        msgbuf_ring_t *flow_ring = (msgbuf_ring_t *)msgbuf_flow_info;
        uint16 rd, wr;
        uint32 dma_buf_len = flow_ring->max_items * flow_ring->item_len;

        if (fmt == NULL) {
                fmt = default_fmt;
        }

        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("%s: Skip dumping flowring due to Link down\n", __FUNCTION__));
                return;
        }

        dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, flow_ring->idx);
        dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, flow_ring->idx);
        bcm_bprintf(strbuf, fmt, rd, wr, flow_ring->dma_buf.va,
                ltoh32(flow_ring->base_addr.high_addr),
                ltoh32(flow_ring->base_addr.low_addr),
                flow_ring->item_len, flow_ring->max_items,
                dma_buf_len);
}

void dhd_prot_print_info(dhd_pub_t *dhd, struct bcmstrbuf *strbuf)
{
        dhd_prot_t *prot = dhd->prot;
        bcm_bprintf(strbuf, "IPCrevs: Dev %d, \t Host %d, \tactive %d\n",
                dhd->prot->device_ipc_version,
                dhd->prot->host_ipc_version,
                dhd->prot->active_ipc_version);

        bcm_bprintf(strbuf, "max Host TS bufs to post: %d, \t posted %d \n",
                dhd->prot->max_tsbufpost, dhd->prot->cur_ts_bufs_posted);
        bcm_bprintf(strbuf, "max INFO bufs to post: %d, \t posted %d \n",
                dhd->prot->max_infobufpost, dhd->prot->infobufpost);
        bcm_bprintf(strbuf, "max event bufs to post: %d, \t posted %d \n",
                dhd->prot->max_eventbufpost, dhd->prot->cur_event_bufs_posted);
        bcm_bprintf(strbuf, "max ioctlresp bufs to post: %d, \t posted %d \n",
                dhd->prot->max_ioctlrespbufpost, dhd->prot->cur_ioctlresp_bufs_posted);
        bcm_bprintf(strbuf, "max RX bufs to post: %d, \t posted %d \n",
                dhd->prot->max_rxbufpost, dhd->prot->rxbufpost);

        bcm_bprintf(strbuf,
                "%14s %5s %5s %17s %17s %14s %14s %10s\n",
                "Type", "RD", "WR", "BASE(VA)", "BASE(PA)",
                "WORK_ITEM_SIZE", "MAX_WORK_ITEMS", "TOTAL_SIZE");
        bcm_bprintf(strbuf, "%14s", "H2DCtrlPost");
        dhd_prot_print_flow_ring(dhd, &prot->h2dring_ctrl_subn, strbuf,
                " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        bcm_bprintf(strbuf, "%14s", "D2HCtrlCpl");
        dhd_prot_print_flow_ring(dhd, &prot->d2hring_ctrl_cpln, strbuf,
                " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        bcm_bprintf(strbuf, "%14s", "H2DRxPost", prot->rxbufpost);
        dhd_prot_print_flow_ring(dhd, &prot->h2dring_rxp_subn, strbuf,
                " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        bcm_bprintf(strbuf, "%14s", "D2HRxCpl");
        dhd_prot_print_flow_ring(dhd, &prot->d2hring_rx_cpln, strbuf,
                " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        bcm_bprintf(strbuf, "%14s", "D2HTxCpl");
        dhd_prot_print_flow_ring(dhd, &prot->d2hring_tx_cpln, strbuf,
                " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        if (dhd->prot->h2dring_info_subn != NULL && dhd->prot->d2hring_info_cpln != NULL) {
                bcm_bprintf(strbuf, "%14s", "H2DRingInfoSub");
                dhd_prot_print_flow_ring(dhd, prot->h2dring_info_subn, strbuf,
                        " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
                bcm_bprintf(strbuf, "%14s", "D2HRingInfoCpl");
                dhd_prot_print_flow_ring(dhd, prot->d2hring_info_cpln, strbuf,
                        " %5d %5d %17p %8x:%8x %14d %14d %10d\n");
        }

        bcm_bprintf(strbuf, "active_tx_count %d  pktidmap_avail(ctrl/rx/tx) %d %d %d\n",
                OSL_ATOMIC_READ(dhd->osh, &dhd->prot->active_tx_count),
                DHD_PKTID_AVAIL(dhd->prot->pktid_ctrl_map),
                DHD_PKTID_AVAIL(dhd->prot->pktid_rx_map),
                DHD_PKTID_AVAIL(dhd->prot->pktid_tx_map));

}

int
dhd_prot_flow_ring_delete(dhd_pub_t *dhd, flow_ring_node_t *flow_ring_node)
{
        tx_flowring_delete_request_t *flow_delete_rqst;
        dhd_prot_t *prot = dhd->prot;
        unsigned long flags;
        uint16 alloced = 0;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Request for ring buffer space */
        flow_delete_rqst = (tx_flowring_delete_request_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (flow_delete_rqst == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DHD_ERROR(("%s: Flow Delete Req - failure ring space\n", __FUNCTION__));
                return BCME_NOMEM;
        }

        /* Common msg buf hdr */
        flow_delete_rqst->msg.msg_type = MSG_TYPE_FLOW_RING_DELETE;
        flow_delete_rqst->msg.if_id = (uint8)flow_ring_node->flow_info.ifindex;
        flow_delete_rqst->msg.request_id = htol32(0); /* TBD */
        flow_delete_rqst->msg.flags = ring->current_phase;

        flow_delete_rqst->msg.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;

        /* Update Delete info */
        flow_delete_rqst->flow_ring_id = htol16((uint16)flow_ring_node->flowid);
        flow_delete_rqst->reason = htol16(BCME_OK);

        DHD_ERROR(("%s: Send Flow Delete Req RING ID %d for peer " MACDBG
                " prio %d ifindex %d\n", __FUNCTION__, flow_ring_node->flowid,
                MAC2STRDBG(flow_ring_node->flow_info.da), flow_ring_node->flow_info.tid,
                flow_ring_node->flow_info.ifindex));

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, flow_delete_rqst, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return BCME_OK;
}

static void BCMFASTPATH
dhd_prot_flow_ring_fastdelete(dhd_pub_t *dhd, uint16 flowid, uint16 rd_idx)
{
        flow_ring_node_t *flow_ring_node = DHD_FLOW_RING(dhd, flowid);
        msgbuf_ring_t *ring = (msgbuf_ring_t *)flow_ring_node->prot_info;
        host_txbuf_cmpl_t txstatus;
        host_txbuf_post_t *txdesc;
        uint16 wr_idx;

        DHD_INFO(("%s: FAST delete ring, flowid=%d, rd_idx=%d, wr_idx=%d\n",
                __FUNCTION__, flowid, rd_idx, ring->wr));

        memset(&txstatus, 0, sizeof(txstatus));
        txstatus.compl_hdr.flow_ring_id = flowid;
        txstatus.cmn_hdr.if_id = flow_ring_node->flow_info.ifindex;
        wr_idx = ring->wr;

        while (wr_idx != rd_idx) {
                if (wr_idx)
                        wr_idx--;
                else
                        wr_idx = ring->max_items - 1;
                txdesc = (host_txbuf_post_t *)((char *)DHD_RING_BGN_VA(ring) +
                        (wr_idx * ring->item_len));
                txstatus.cmn_hdr.request_id = txdesc->cmn_hdr.request_id;
                dhd_prot_txstatus_process(dhd, &txstatus);
        }
}

static void
dhd_prot_flow_ring_delete_response_process(dhd_pub_t *dhd, void *msg)
{
        tx_flowring_delete_response_t *flow_delete_resp = (tx_flowring_delete_response_t *)msg;

        DHD_ERROR(("%s: Flow Delete Response status = %d Flow %d\n", __FUNCTION__,
                flow_delete_resp->cmplt.status, flow_delete_resp->cmplt.flow_ring_id));

        if (dhd->fast_delete_ring_support) {
                dhd_prot_flow_ring_fastdelete(dhd, flow_delete_resp->cmplt.flow_ring_id,
                        flow_delete_resp->read_idx);
        }
        dhd_bus_flow_ring_delete_response(dhd->bus, flow_delete_resp->cmplt.flow_ring_id,
                flow_delete_resp->cmplt.status);
}

static void
dhd_prot_process_flow_ring_resume_response(dhd_pub_t *dhd, void* msg)
{
#ifdef IDLE_TX_FLOW_MGMT
        tx_idle_flowring_resume_response_t      *flow_resume_resp =
                (tx_idle_flowring_resume_response_t *)msg;

        DHD_ERROR(("%s Flow resume Response status = %d Flow %d\n", __FUNCTION__,
                flow_resume_resp->cmplt.status, flow_resume_resp->cmplt.flow_ring_id));

        dhd_bus_flow_ring_resume_response(dhd->bus, flow_resume_resp->cmplt.flow_ring_id,
                flow_resume_resp->cmplt.status);
#endif /* IDLE_TX_FLOW_MGMT */
}

static void
dhd_prot_process_flow_ring_suspend_response(dhd_pub_t *dhd, void* msg)
{
#ifdef IDLE_TX_FLOW_MGMT
        int16 status;
        tx_idle_flowring_suspend_response_t     *flow_suspend_resp =
                (tx_idle_flowring_suspend_response_t *)msg;
        status = flow_suspend_resp->cmplt.status;

        DHD_ERROR(("%s Flow id %d suspend Response status = %d\n",
                __FUNCTION__, flow_suspend_resp->cmplt.flow_ring_id,
                status));

        if (status != BCME_OK) {

                DHD_ERROR(("%s Error in Suspending Flow rings!!"
                        "Dongle will still be polling idle rings!!Status = %d \n",
                        __FUNCTION__, status));
        }
#endif /* IDLE_TX_FLOW_MGMT */
}

int
dhd_prot_flow_ring_flush(dhd_pub_t *dhd, flow_ring_node_t *flow_ring_node)
{
        tx_flowring_flush_request_t *flow_flush_rqst;
        dhd_prot_t *prot = dhd->prot;
        unsigned long flags;
        uint16 alloced = 0;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Request for ring buffer space */
        flow_flush_rqst = (tx_flowring_flush_request_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);
        if (flow_flush_rqst == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DHD_ERROR(("%s: Flow Flush Req - failure ring space\n", __FUNCTION__));
                return BCME_NOMEM;
        }

        /* Common msg buf hdr */
        flow_flush_rqst->msg.msg_type = MSG_TYPE_FLOW_RING_FLUSH;
        flow_flush_rqst->msg.if_id = (uint8)flow_ring_node->flow_info.ifindex;
        flow_flush_rqst->msg.request_id = htol32(0); /* TBD */
        flow_flush_rqst->msg.flags = ring->current_phase;
        flow_flush_rqst->msg.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;

        flow_flush_rqst->flow_ring_id = htol16((uint16)flow_ring_node->flowid);
        flow_flush_rqst->reason = htol16(BCME_OK);

        DHD_INFO(("%s: Send Flow Flush Req\n", __FUNCTION__));

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, flow_flush_rqst, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return BCME_OK;
} /* dhd_prot_flow_ring_flush */

static void
dhd_prot_flow_ring_flush_response_process(dhd_pub_t *dhd, void *msg)
{
        tx_flowring_flush_response_t *flow_flush_resp = (tx_flowring_flush_response_t *)msg;

        DHD_INFO(("%s: Flow Flush Response status = %d\n", __FUNCTION__,
                flow_flush_resp->cmplt.status));

        dhd_bus_flow_ring_flush_response(dhd->bus, flow_flush_resp->cmplt.flow_ring_id,
                flow_flush_resp->cmplt.status);
}

/**
 * Request dongle to configure soft doorbells for D2H rings. Host populated soft
 * doorbell information is transferred to dongle via the d2h ring config control
 * message.
 */
void
dhd_msgbuf_ring_config_d2h_soft_doorbell(dhd_pub_t *dhd)
{
#if defined(DHD_D2H_SOFT_DOORBELL_SUPPORT)
        uint16 ring_idx;
        uint8 *msg_next;
        void *msg_start;
        uint16 alloced = 0;
        unsigned long flags;
        dhd_prot_t *prot = dhd->prot;
        ring_config_req_t *ring_config_req;
        bcmpcie_soft_doorbell_t *soft_doorbell;
        msgbuf_ring_t *ctrl_ring = &prot->h2dring_ctrl_subn;
        const uint16 d2h_rings = BCMPCIE_D2H_COMMON_MSGRINGS;

        /* Claim space for d2h_ring number of d2h_ring_config_req_t messages */
        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);
        msg_start = dhd_prot_alloc_ring_space(dhd, ctrl_ring, d2h_rings, &alloced, TRUE);

        if (msg_start == NULL) {
                DHD_ERROR(("%s Msgbuf no space for %d D2H ring config soft doorbells\n",
                        __FUNCTION__, d2h_rings));
                DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);
                return;
        }

        msg_next = (uint8*)msg_start;

        for (ring_idx = 0; ring_idx < d2h_rings; ring_idx++) {

                /* position the ring_config_req into the ctrl subm ring */
                ring_config_req = (ring_config_req_t *)msg_next;

                /* Common msg header */
                ring_config_req->msg.msg_type = MSG_TYPE_D2H_RING_CONFIG;
                ring_config_req->msg.if_id = 0;
                ring_config_req->msg.flags = 0;

                ring_config_req->msg.epoch = ctrl_ring->seqnum % H2D_EPOCH_MODULO;
                ctrl_ring->seqnum++;

                ring_config_req->msg.request_id = htol32(DHD_FAKE_PKTID); /* unused */

                /* Ring Config subtype and d2h ring_id */
                ring_config_req->subtype = htol16(D2H_RING_CONFIG_SUBTYPE_SOFT_DOORBELL);
                ring_config_req->ring_id = htol16(DHD_D2H_RINGID(ring_idx));

                /* Host soft doorbell configuration */
                soft_doorbell = &prot->soft_doorbell[ring_idx];

                ring_config_req->soft_doorbell.value = htol32(soft_doorbell->value);
                ring_config_req->soft_doorbell.haddr.high =
                        htol32(soft_doorbell->haddr.high);
                ring_config_req->soft_doorbell.haddr.low =
                        htol32(soft_doorbell->haddr.low);
                ring_config_req->soft_doorbell.items = htol16(soft_doorbell->items);
                ring_config_req->soft_doorbell.msecs = htol16(soft_doorbell->msecs);

                DHD_INFO(("%s: Soft doorbell haddr 0x%08x 0x%08x value 0x%08x\n",
                        __FUNCTION__, ring_config_req->soft_doorbell.haddr.high,
                        ring_config_req->soft_doorbell.haddr.low,
                        ring_config_req->soft_doorbell.value));

                msg_next = msg_next + ctrl_ring->item_len;
        }

        /* update control subn ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ctrl_ring, msg_start, d2h_rings);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

#endif /* DHD_D2H_SOFT_DOORBELL_SUPPORT */
}

static void
dhd_prot_process_d2h_ring_config_complete(dhd_pub_t *dhd, void *msg)
{
        DHD_INFO(("%s: Ring Config Response - status %d ringid %d\n",
                __FUNCTION__, ltoh16(((ring_config_resp_t *)msg)->compl_hdr.status),
                ltoh16(((ring_config_resp_t *)msg)->compl_hdr.flow_ring_id)));
}

#ifdef WL_CFGVENDOR_SEND_HANG_EVENT
void
copy_ext_trap_sig(dhd_pub_t *dhd, trap_t *tr)
{
        uint32 *ext_data = dhd->extended_trap_data;
        hnd_ext_trap_hdr_t *hdr;
        const bcm_tlv_t *tlv;

        if (ext_data == NULL) {
                return;
        }
        /* First word is original trap_data */
        ext_data++;

        /* Followed by the extended trap data header */
        hdr = (hnd_ext_trap_hdr_t *)ext_data;

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_SIGNATURE);
        if (tlv) {
                memcpy(tr, &tlv->data, sizeof(struct _trap_struct));
        }
}
#define TRAP_T_NAME_OFFSET(var) {#var, OFFSETOF(trap_t, var)}

typedef struct {
        char name[HANG_INFO_TRAP_T_NAME_MAX];
        uint32 offset;
} hang_info_trap_t;

static hang_info_trap_t hang_info_trap_tbl[] = {
        {"reason", 0},
        {"ver", VENDOR_SEND_HANG_EXT_INFO_VER},
        {"stype", 0},
        TRAP_T_NAME_OFFSET(type),
        TRAP_T_NAME_OFFSET(epc),
        TRAP_T_NAME_OFFSET(cpsr),
        TRAP_T_NAME_OFFSET(spsr),
        TRAP_T_NAME_OFFSET(r0),
        TRAP_T_NAME_OFFSET(r1),
        TRAP_T_NAME_OFFSET(r2),
        TRAP_T_NAME_OFFSET(r3),
        TRAP_T_NAME_OFFSET(r4),
        TRAP_T_NAME_OFFSET(r5),
        TRAP_T_NAME_OFFSET(r6),
        TRAP_T_NAME_OFFSET(r7),
        TRAP_T_NAME_OFFSET(r8),
        TRAP_T_NAME_OFFSET(r9),
        TRAP_T_NAME_OFFSET(r10),
        TRAP_T_NAME_OFFSET(r11),
        TRAP_T_NAME_OFFSET(r12),
        TRAP_T_NAME_OFFSET(r13),
        TRAP_T_NAME_OFFSET(r14),
        TRAP_T_NAME_OFFSET(pc),
        {"", 0}
};

#define TAG_TRAP_IS_STATE(tag) \
        ((tag == TAG_TRAP_MEMORY) || (tag == TAG_TRAP_PCIE_Q) || (tag == TAG_TRAP_WLC_STATE))

static void
copy_hang_info_head(char *dest, trap_t *src, int len, int field_name,
                int *bytes_written, int *cnt, char *cookie)
{
        uint8 *ptr;
        int remain_len;
        int i;

        ptr = (uint8 *)src;

        memset(dest, 0, len);
        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;

        /* hang reason, hang info ver */
        for (i = 0; (i < HANG_INFO_TRAP_T_SUBTYPE_IDX) && (*cnt < HANG_FIELD_CNT_MAX);
                        i++, (*cnt)++) {
                if (field_name) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%s:%c",
                                        hang_info_trap_tbl[i].name, HANG_KEY_DEL);
                }
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%d%c",
                                hang_info_trap_tbl[i].offset, HANG_KEY_DEL);

        }

        if (*cnt < HANG_FIELD_CNT_MAX) {
                if (field_name) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%s:%c",
                                        "cookie", HANG_KEY_DEL);
                }
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%s%c",
                                cookie, HANG_KEY_DEL);
                (*cnt)++;
        }

        if (*cnt < HANG_FIELD_CNT_MAX) {
                if (field_name) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%s:%c",
                                        hang_info_trap_tbl[HANG_INFO_TRAP_T_SUBTYPE_IDX].name,
                                        HANG_KEY_DEL);
                }
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%08x%c",
                                hang_info_trap_tbl[HANG_INFO_TRAP_T_SUBTYPE_IDX].offset,
                                HANG_KEY_DEL);
                (*cnt)++;
        }

        if (*cnt < HANG_FIELD_CNT_MAX) {
                if (field_name) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%s:%c",
                                        hang_info_trap_tbl[HANG_INFO_TRAP_T_EPC_IDX].name,
                                        HANG_KEY_DEL);
                }
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%08x%c",
                                *(uint32 *)
                                (ptr + hang_info_trap_tbl[HANG_INFO_TRAP_T_EPC_IDX].offset),
                                HANG_KEY_DEL);
                (*cnt)++;
        }
}

static void
copy_hang_info_trap_t(char *dest, trap_t *src, int len, int field_name,
                int *bytes_written, int *cnt, char *cookie)
{
        uint8 *ptr;
        int remain_len;
        int i;

        ptr = (uint8 *)src;

        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;

        for (i = HANG_INFO_TRAP_T_OFFSET_IDX;
                        (hang_info_trap_tbl[i].name[0] != 0) && (*cnt < HANG_FIELD_CNT_MAX);
                        i++, (*cnt)++) {
                if (field_name) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%c%s:",
                                        HANG_RAW_DEL, hang_info_trap_tbl[i].name);
                }
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%c%08x",
                                HANG_RAW_DEL, *(uint32 *)(ptr + hang_info_trap_tbl[i].offset));
        }
}

static void
copy_hang_info_stack(dhd_pub_t *dhd, char *dest, int *bytes_written, int *cnt)
{
        int remain_len;
        int i = 0;
        const uint32 *stack;
        uint32 *ext_data = dhd->extended_trap_data;
        hnd_ext_trap_hdr_t *hdr;
        const bcm_tlv_t *tlv;
        int remain_stack_cnt = 0;
        uint32 dummy_data = 0;
        int bigdata_key_stack_cnt = 0;

        if (ext_data == NULL) {
                return;
        }
        /* First word is original trap_data */
        ext_data++;

        /* Followed by the extended trap data header */
        hdr = (hnd_ext_trap_hdr_t *)ext_data;

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_STACK);

        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;

        if (tlv) {
                stack = (const uint32 *)tlv->data;

                *bytes_written += scnprintf(&dest[*bytes_written], remain_len,
                                "%08x", *(uint32 *)(stack++));
                (*cnt)++;
                if (*cnt >= HANG_FIELD_CNT_MAX) {
                        return;
                }
                for (i = 1; i < (uint32)(tlv->len / sizeof(uint32)); i++, bigdata_key_stack_cnt++) {
                        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                        /* Raw data for bigdata use '_' and Key data for bigdata use space */
                        *bytes_written += scnprintf(&dest[*bytes_written], remain_len,
                                "%c%08x",
                                i <= HANG_INFO_BIGDATA_KEY_STACK_CNT ? HANG_KEY_DEL : HANG_RAW_DEL,
                                *(uint32 *)(stack++));

                        (*cnt)++;
                        if ((*cnt >= HANG_FIELD_CNT_MAX) ||
                                        (i >= HANG_FIELD_TRAP_T_STACK_CNT_MAX)) {
                                return;
                        }
                }
        }

        remain_stack_cnt = HANG_FIELD_TRAP_T_STACK_CNT_MAX - i;

        for (i = 0; i < remain_stack_cnt; i++) {
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%c%08x",
                                HANG_RAW_DEL, dummy_data);
                (*cnt)++;
                if (*cnt >= HANG_FIELD_CNT_MAX) {
                        return;
                }
        }

}

static void
get_hang_info_trap_subtype(dhd_pub_t *dhd, uint32 *subtype)
{
        uint32 i;
        uint32 *ext_data = dhd->extended_trap_data;
        hnd_ext_trap_hdr_t *hdr;
        const bcm_tlv_t *tlv;

        /* First word is original trap_data */
        ext_data++;

        /* Followed by the extended trap data header */
        hdr = (hnd_ext_trap_hdr_t *)ext_data;

        /* Dump a list of all tags found  before parsing data */
        for (i = TAG_TRAP_DEEPSLEEP; i < TAG_TRAP_LAST; i++) {
                tlv = bcm_parse_tlvs(hdr->data, hdr->len, i);
                if (tlv) {
                        if (!TAG_TRAP_IS_STATE(i)) {
                                *subtype = i;
                                return;
                        }
                }
        }
}

static void
copy_hang_info_specific(dhd_pub_t *dhd, char *dest, int *bytes_written, int *cnt)
{
        int remain_len;
        int i;
        const uint32 *data;
        uint32 *ext_data = dhd->extended_trap_data;
        hnd_ext_trap_hdr_t *hdr;
        const bcm_tlv_t *tlv;
        int remain_trap_data = 0;
        uint8 buf_u8[sizeof(uint32)] = { 0, };
        const uint8 *p_u8;

        if (ext_data == NULL) {
                return;
        }
        /* First word is original trap_data */
        ext_data++;

        /* Followed by the extended trap data header */
        hdr = (hnd_ext_trap_hdr_t *)ext_data;

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_SIGNATURE);
        if (tlv) {
                /* header include tlv hader */
                remain_trap_data = (hdr->len - tlv->len - sizeof(uint16));
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_STACK);
        if (tlv) {
                /* header include tlv hader */
                remain_trap_data -= (tlv->len + sizeof(uint16));
        }

        data = (const uint32 *)(hdr->data + (hdr->len  - remain_trap_data));

        remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;

        for (i = 0; i < (uint32)(remain_trap_data / sizeof(uint32)) && *cnt < HANG_FIELD_CNT_MAX;
                        i++, (*cnt)++) {
                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%c%08x",
                                HANG_RAW_DEL, *(uint32 *)(data++));
        }

        if (*cnt >= HANG_FIELD_CNT_MAX) {
                return;
        }

        remain_trap_data -= (sizeof(uint32) * i);

        if (remain_trap_data > sizeof(buf_u8)) {
                DHD_ERROR(("%s: resize remain_trap_data\n", __FUNCTION__));
                remain_trap_data =  sizeof(buf_u8);
        }

        if (remain_trap_data) {
                p_u8 = (const uint8 *)data;
                for (i = 0; i < remain_trap_data; i++) {
                        buf_u8[i] = *(const uint8 *)(p_u8++);
                }

                remain_len = VENDOR_SEND_HANG_EXT_INFO_LEN - *bytes_written;
                *bytes_written += scnprintf(&dest[*bytes_written], remain_len, "%c%08x",
                                HANG_RAW_DEL, ltoh32_ua(buf_u8));
                (*cnt)++;
        }
}

void
copy_hang_info_trap(dhd_pub_t *dhd)
{
        trap_t tr;
        int bytes_written;
        int trap_subtype = 0;

        if (!dhd || !dhd->hang_info) {
                DHD_ERROR(("%s dhd=%p hang_info=%p\n", __FUNCTION__,
                        dhd, (dhd ? dhd->hang_info : NULL)));
                return;
        }

        if (!dhd->dongle_trap_occured) {
                DHD_ERROR(("%s: dongle_trap_occured is FALSE\n", __FUNCTION__));
                return;
        }

        memset(&tr, 0x00, sizeof(struct _trap_struct));

        copy_ext_trap_sig(dhd, &tr);
        get_hang_info_trap_subtype(dhd, &trap_subtype);

        hang_info_trap_tbl[HANG_INFO_TRAP_T_REASON_IDX].offset = HANG_REASON_DONGLE_TRAP;
        hang_info_trap_tbl[HANG_INFO_TRAP_T_SUBTYPE_IDX].offset = trap_subtype;

        bytes_written = 0;
        dhd->hang_info_cnt = 0;
        get_debug_dump_time(dhd->debug_dump_time_hang_str);
        copy_debug_dump_time(dhd->debug_dump_time_str, dhd->debug_dump_time_hang_str);

        copy_hang_info_head(dhd->hang_info, &tr, VENDOR_SEND_HANG_EXT_INFO_LEN, FALSE,
                        &bytes_written, &dhd->hang_info_cnt, dhd->debug_dump_time_hang_str);

        DHD_INFO(("hang info haed cnt: %d len: %d data: %s\n",
                dhd->hang_info_cnt, (int)strlen(dhd->hang_info), dhd->hang_info));

        clear_debug_dump_time(dhd->debug_dump_time_hang_str);

        if (dhd->hang_info_cnt < HANG_FIELD_CNT_MAX) {
                copy_hang_info_stack(dhd, dhd->hang_info, &bytes_written, &dhd->hang_info_cnt);
                DHD_INFO(("hang info stack cnt: %d len: %d data: %s\n",
                        dhd->hang_info_cnt, (int)strlen(dhd->hang_info), dhd->hang_info));
        }

        if (dhd->hang_info_cnt < HANG_FIELD_CNT_MAX) {
                copy_hang_info_trap_t(dhd->hang_info, &tr, VENDOR_SEND_HANG_EXT_INFO_LEN, FALSE,
                                &bytes_written, &dhd->hang_info_cnt, dhd->debug_dump_time_hang_str);
                DHD_INFO(("hang info trap_t cnt: %d len: %d data: %s\n",
                        dhd->hang_info_cnt, (int)strlen(dhd->hang_info), dhd->hang_info));
        }

        if (dhd->hang_info_cnt < HANG_FIELD_CNT_MAX) {
                copy_hang_info_specific(dhd, dhd->hang_info, &bytes_written, &dhd->hang_info_cnt);
                DHD_INFO(("hang info specific cnt: %d len: %d data: %s\n",
                        dhd->hang_info_cnt, (int)strlen(dhd->hang_info), dhd->hang_info));
        }

}
#endif /* WL_CFGVENDOR_SEND_HANG_EVENT */

int
dhd_prot_debug_info_print(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        msgbuf_ring_t *ring;
        uint16 rd, wr;
        uint32 dma_buf_len;
        uint64 current_time;

        DHD_ERROR(("\n ------- DUMPING VERSION INFORMATION ------- \r\n"));
        DHD_ERROR(("DHD: %s\n", dhd_version));
        DHD_ERROR(("Firmware: %s\n", fw_version));

#ifdef DHD_FW_COREDUMP
        DHD_ERROR(("\n ------- DUMPING CONFIGURATION INFORMATION ------ \r\n"));
        DHD_ERROR(("memdump mode: %d\n", dhd->memdump_enabled));
#endif /* DHD_FW_COREDUMP */

        DHD_ERROR(("\n ------- DUMPING PROTOCOL INFORMATION ------- \r\n"));
        DHD_ERROR(("ICPrevs: Dev %d, Host %d, active %d\n",
                prot->device_ipc_version,
                prot->host_ipc_version,
                prot->active_ipc_version));
        DHD_ERROR(("d2h_intr_method -> %s\n",
                        dhd->bus->d2h_intr_method ? "PCIE_MSI" : "PCIE_INTX"));
        DHD_ERROR(("max Host TS bufs to post: %d, posted %d\n",
                prot->max_tsbufpost, prot->cur_ts_bufs_posted));
        DHD_ERROR(("max INFO bufs to post: %d, posted %d\n",
                prot->max_infobufpost, prot->infobufpost));
        DHD_ERROR(("max event bufs to post: %d, posted %d\n",
                prot->max_eventbufpost, prot->cur_event_bufs_posted));
        DHD_ERROR(("max ioctlresp bufs to post: %d, posted %d\n",
                prot->max_ioctlrespbufpost, prot->cur_ioctlresp_bufs_posted));
        DHD_ERROR(("max RX bufs to post: %d, posted %d\n",
                prot->max_rxbufpost, prot->rxbufpost));
        DHD_ERROR(("h2d_max_txpost: %d, prot->h2d_max_txpost: %d\n",
                h2d_max_txpost, prot->h2d_max_txpost));

        current_time = OSL_LOCALTIME_NS();
        DHD_ERROR(("current_time="SEC_USEC_FMT"\n", GET_SEC_USEC(current_time)));
        DHD_ERROR(("ioctl_fillup_time="SEC_USEC_FMT
                " ioctl_ack_time="SEC_USEC_FMT
                " ioctl_cmplt_time="SEC_USEC_FMT"\n",
                GET_SEC_USEC(prot->ioctl_fillup_time),
                GET_SEC_USEC(prot->ioctl_ack_time),
                GET_SEC_USEC(prot->ioctl_cmplt_time)));

        DHD_ERROR(("\n ------- DUMPING IOCTL RING RD WR Pointers ------- \r\n"));

        ring = &prot->h2dring_ctrl_subn;
        dma_buf_len = ring->max_items * ring->item_len;
        DHD_ERROR(("CtrlPost: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                ltoh32(ring->base_addr.low_addr), dma_buf_len));
        DHD_ERROR(("CtrlPost: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("CtrlPost: From Shared Mem: RD and WR are invalid"
                        " due to PCIe link down\r\n"));
        } else {
                dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                DHD_ERROR(("CtrlPost: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
        }
        DHD_ERROR(("CtrlPost: seq num: %d \r\n", ring->seqnum % H2D_EPOCH_MODULO));

        ring = &prot->d2hring_ctrl_cpln;
        dma_buf_len = ring->max_items * ring->item_len;
        DHD_ERROR(("CtrlCpl: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                ltoh32(ring->base_addr.low_addr), dma_buf_len));
        DHD_ERROR(("CtrlCpl: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
        if (dhd->bus->is_linkdown) {
                DHD_ERROR(("CtrlCpl: From Shared Mem: RD and WR are invalid"
                        " due to PCIe link down\r\n"));
        } else {
                dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                DHD_ERROR(("CtrlCpl: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
        }
        DHD_ERROR(("CtrlCpl: Expected seq num: %d \r\n", ring->seqnum % H2D_EPOCH_MODULO));

        ring = prot->h2dring_info_subn;
        if (ring) {
                dma_buf_len = ring->max_items * ring->item_len;
                DHD_ERROR(("InfoSub: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                        ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                        ltoh32(ring->base_addr.low_addr), dma_buf_len));
                DHD_ERROR(("InfoSub: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
                if (dhd->bus->is_linkdown) {
                        DHD_ERROR(("InfoSub: From Shared Mem: RD and WR are invalid"
                                " due to PCIe link down\r\n"));
                } else {
                        dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                        dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                        DHD_ERROR(("InfoSub: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
                }
                DHD_ERROR(("InfoSub: seq num: %d \r\n", ring->seqnum % H2D_EPOCH_MODULO));
        }
        ring = prot->d2hring_info_cpln;
        if (ring) {
                dma_buf_len = ring->max_items * ring->item_len;
                DHD_ERROR(("InfoCpl: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                        ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                        ltoh32(ring->base_addr.low_addr), dma_buf_len));
                DHD_ERROR(("InfoCpl: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
                if (dhd->bus->is_linkdown) {
                        DHD_ERROR(("InfoCpl: From Shared Mem: RD and WR are invalid"
                                " due to PCIe link down\r\n"));
                } else {
                        dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                        dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                        DHD_ERROR(("InfoCpl: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
                }
                DHD_ERROR(("InfoCpl: Expected seq num: %d \r\n", ring->seqnum % D2H_EPOCH_MODULO));
        }

        ring = &prot->d2hring_tx_cpln;
        if (ring) {
                dma_buf_len = ring->max_items * ring->item_len;
                DHD_ERROR(("TxCpl: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                        ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                        ltoh32(ring->base_addr.low_addr), dma_buf_len));
                DHD_ERROR(("TxCpl: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
                if (dhd->bus->is_linkdown) {
                        DHD_ERROR(("TxCpl: From Shared Mem: RD and WR are invalid"
                                " due to PCIe link down\r\n"));
                } else {
                        dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                        dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                        DHD_ERROR(("TxCpl: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
                }
                DHD_ERROR(("TxCpl: Expected seq num: %d \r\n", ring->seqnum % D2H_EPOCH_MODULO));
        }

        ring = &prot->d2hring_rx_cpln;
        if (ring) {
                dma_buf_len = ring->max_items * ring->item_len;
                DHD_ERROR(("RxCpl: Mem Info: BASE(VA) %p BASE(PA) %x:%x SIZE %d \r\n",
                        ring->dma_buf.va, ltoh32(ring->base_addr.high_addr),
                        ltoh32(ring->base_addr.low_addr), dma_buf_len));
                DHD_ERROR(("RxCpl: From Host mem: RD: %d WR %d \r\n", ring->rd, ring->wr));
                if (dhd->bus->is_linkdown) {
                        DHD_ERROR(("RxCpl: From Shared Mem: RD and WR are invalid"
                                " due to PCIe link down\r\n"));
                } else {
                        dhd_bus_cmn_readshared(dhd->bus, &rd, RING_RD_UPD, ring->idx);
                        dhd_bus_cmn_readshared(dhd->bus, &wr, RING_WR_UPD, ring->idx);
                        DHD_ERROR(("RxCpl: From Shared Mem: RD: %d WR %d \r\n", rd, wr));
                }
                DHD_ERROR(("RxCpl: Expected seq num: %d \r\n", ring->seqnum % D2H_EPOCH_MODULO));
        }

        DHD_ERROR(("%s: cur_ioctlresp_bufs_posted %d cur_event_bufs_posted %d\n",
                __FUNCTION__, prot->cur_ioctlresp_bufs_posted, prot->cur_event_bufs_posted));

        dhd_pcie_debug_info_dump(dhd);

        return 0;
}

int
dhd_prot_ringupd_dump(dhd_pub_t *dhd, struct bcmstrbuf *b)
{
        uint32 *ptr;
        uint32 value;

        if (dhd->prot->d2h_dma_indx_wr_buf.va) {
                uint32 i;
                uint32 max_h2d_queues = dhd_bus_max_h2d_queues(dhd->bus);

                OSL_CACHE_INV((void *)dhd->prot->d2h_dma_indx_wr_buf.va,
                        dhd->prot->d2h_dma_indx_wr_buf.len);

                ptr = (uint32 *)(dhd->prot->d2h_dma_indx_wr_buf.va);

                bcm_bprintf(b, "\n max_tx_queues %d\n", max_h2d_queues);

                bcm_bprintf(b, "\nRPTR block H2D common rings, 0x%04x\n", ptr);
                value = ltoh32(*ptr);
                bcm_bprintf(b, "\tH2D CTRL: value 0x%04x\n", value);
                ptr++;
                value = ltoh32(*ptr);
                bcm_bprintf(b, "\tH2D RXPOST: value 0x%04x\n", value);

                ptr++;
                bcm_bprintf(b, "RPTR block Flow rings , 0x%04x\n", ptr);
                for (i = BCMPCIE_H2D_COMMON_MSGRINGS; i < max_h2d_queues; i++) {
                        value = ltoh32(*ptr);
                        bcm_bprintf(b, "\tflowring ID %d: value 0x%04x\n", i, value);
                        ptr++;
                }
        }

        if (dhd->prot->h2d_dma_indx_rd_buf.va) {
                OSL_CACHE_INV((void *)dhd->prot->h2d_dma_indx_rd_buf.va,
                        dhd->prot->h2d_dma_indx_rd_buf.len);

                ptr = (uint32 *)(dhd->prot->h2d_dma_indx_rd_buf.va);

                bcm_bprintf(b, "\nWPTR block D2H common rings, 0x%04x\n", ptr);
                value = ltoh32(*ptr);
                bcm_bprintf(b, "\tD2H CTRLCPLT: value 0x%04x\n", value);
                ptr++;
                value = ltoh32(*ptr);
                bcm_bprintf(b, "\tD2H TXCPLT: value 0x%04x\n", value);
                ptr++;
                value = ltoh32(*ptr);
                bcm_bprintf(b, "\tD2H RXCPLT: value 0x%04x\n", value);
        }

        return 0;
}

uint32
dhd_prot_metadata_dbg_set(dhd_pub_t *dhd, bool val)
{
        dhd_prot_t *prot = dhd->prot;
#if DHD_DBG_SHOW_METADATA
        prot->metadata_dbg = val;
#endif // endif
        return (uint32)prot->metadata_dbg;
}

uint32
dhd_prot_metadata_dbg_get(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        return (uint32)prot->metadata_dbg;
}

uint32
dhd_prot_metadatalen_set(dhd_pub_t *dhd, uint32 val, bool rx)
{
        dhd_prot_t *prot = dhd->prot;
        if (rx)
                prot->rx_metadata_offset = (uint16)val;
        else
                prot->tx_metadata_offset = (uint16)val;
        return dhd_prot_metadatalen_get(dhd, rx);
}

uint32
dhd_prot_metadatalen_get(dhd_pub_t *dhd, bool rx)
{
        dhd_prot_t *prot = dhd->prot;
        if (rx)
                return prot->rx_metadata_offset;
        else
                return prot->tx_metadata_offset;
}

/** optimization to write "n" tx items at a time to ring */
uint32
dhd_prot_txp_threshold(dhd_pub_t *dhd, bool set, uint32 val)
{
        dhd_prot_t *prot = dhd->prot;
        if (set)
                prot->txp_threshold = (uint16)val;
        val = prot->txp_threshold;
        return val;
}

#ifdef DHD_RX_CHAINING

static INLINE void BCMFASTPATH
dhd_rxchain_reset(rxchain_info_t *rxchain)
{
        rxchain->pkt_count = 0;
}

static void BCMFASTPATH
dhd_rxchain_frame(dhd_pub_t *dhd, void *pkt, uint ifidx)
{
        uint8 *eh;
        uint8 prio;
        dhd_prot_t *prot = dhd->prot;
        rxchain_info_t *rxchain = &prot->rxchain;

        ASSERT(!PKTISCHAINED(pkt));
        ASSERT(PKTCLINK(pkt) == NULL);
        ASSERT(PKTCGETATTR(pkt) == 0);

        eh = PKTDATA(dhd->osh, pkt);
        prio = IP_TOS46(eh + ETHER_HDR_LEN) >> IPV4_TOS_PREC_SHIFT;

        if (rxchain->pkt_count && !(PKT_CTF_CHAINABLE(dhd, ifidx, eh, prio, rxchain->h_sa,
                rxchain->h_da, rxchain->h_prio))) {
                /* Different flow - First release the existing chain */
                dhd_rxchain_commit(dhd);
        }

        /* For routers, with HNDCTF, link the packets using PKTSETCLINK, */
        /* so that the chain can be handed off to CTF bridge as is. */
        if (rxchain->pkt_count == 0) {
                /* First packet in chain */
                rxchain->pkthead = rxchain->pkttail = pkt;

                /* Keep a copy of ptr to ether_da, ether_sa and prio */
                rxchain->h_da = ((struct ether_header *)eh)->ether_dhost;
                rxchain->h_sa = ((struct ether_header *)eh)->ether_shost;
                rxchain->h_prio = prio;
                rxchain->ifidx = ifidx;
                rxchain->pkt_count++;
        } else {
                /* Same flow - keep chaining */
                PKTSETCLINK(rxchain->pkttail, pkt);
                rxchain->pkttail = pkt;
                rxchain->pkt_count++;
        }

        if ((dhd_rx_pkt_chainable(dhd, ifidx)) && (!ETHER_ISMULTI(rxchain->h_da)) &&
                ((((struct ether_header *)eh)->ether_type == HTON16(ETHER_TYPE_IP)) ||
                (((struct ether_header *)eh)->ether_type == HTON16(ETHER_TYPE_IPV6)))) {
                PKTSETCHAINED(dhd->osh, pkt);
                PKTCINCRCNT(rxchain->pkthead);
                PKTCADDLEN(rxchain->pkthead, PKTLEN(dhd->osh, pkt));
        } else {
                dhd_rxchain_commit(dhd);
                return;
        }

        /* If we have hit the max chain length, dispatch the chain and reset */
        if (rxchain->pkt_count >= DHD_PKT_CTF_MAX_CHAIN_LEN) {
                dhd_rxchain_commit(dhd);
        }
}

static void BCMFASTPATH
dhd_rxchain_commit(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;
        rxchain_info_t *rxchain = &prot->rxchain;

        if (rxchain->pkt_count == 0)
                return;

        /* Release the packets to dhd_linux */
        dhd_bus_rx_frame(dhd->bus, rxchain->pkthead, rxchain->ifidx, rxchain->pkt_count);

        /* Reset the chain */
        dhd_rxchain_reset(rxchain);
}

#endif /* DHD_RX_CHAINING */

#ifdef IDLE_TX_FLOW_MGMT
int
dhd_prot_flow_ring_resume(dhd_pub_t *dhd, flow_ring_node_t *flow_ring_node)
{
        tx_idle_flowring_resume_request_t *flow_resume_rqst;
        msgbuf_ring_t *flow_ring;
        dhd_prot_t *prot = dhd->prot;
        unsigned long flags;
        uint16 alloced = 0;
        msgbuf_ring_t *ctrl_ring = &prot->h2dring_ctrl_subn;

        /* Fetch a pre-initialized msgbuf_ring from the flowring pool */
        flow_ring = dhd_prot_flowrings_pool_fetch(dhd, flow_ring_node->flowid);
        if (flow_ring == NULL) {
                DHD_ERROR(("%s: dhd_prot_flowrings_pool_fetch TX Flowid %d failed\n",
                        __FUNCTION__, flow_ring_node->flowid));
                return BCME_NOMEM;
        }

        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);

        /* Request for ctrl_ring buffer space */
        flow_resume_rqst = (tx_idle_flowring_resume_request_t *)
                dhd_prot_alloc_ring_space(dhd, ctrl_ring, 1, &alloced, FALSE);

        if (flow_resume_rqst == NULL) {
                dhd_prot_flowrings_pool_release(dhd, flow_ring_node->flowid, flow_ring);
                DHD_ERROR(("%s: Flow resume Req flowid %d - failure ring space\n",
                        __FUNCTION__, flow_ring_node->flowid));
                DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);
                return BCME_NOMEM;
        }

        flow_ring_node->prot_info = (void *)flow_ring;

        /* Common msg buf hdr */
        flow_resume_rqst->msg.msg_type = MSG_TYPE_FLOW_RING_RESUME;
        flow_resume_rqst->msg.if_id = (uint8)flow_ring_node->flow_info.ifindex;
        flow_resume_rqst->msg.request_id = htol32(0); /* TBD */

        flow_resume_rqst->msg.epoch = ctrl_ring->seqnum % H2D_EPOCH_MODULO;
        ctrl_ring->seqnum++;

        flow_resume_rqst->flow_ring_id = htol16((uint16)flow_ring_node->flowid);
        DHD_ERROR(("%s Send Flow resume Req flow ID %d\n",
                __FUNCTION__, flow_ring_node->flowid));

        /* Update the flow_ring's WRITE index */
        if (IDMA_ACTIVE(dhd) || dhd->dma_h2d_ring_upd_support) {
                dhd_prot_dma_indx_set(dhd, flow_ring->wr,
                                      H2D_DMA_INDX_WR_UPD, flow_ring->idx);
        } else if (IFRM_ACTIVE(dhd) && (flow_ring->idx >= BCMPCIE_H2D_MSGRING_TXFLOW_IDX_START)) {
                dhd_prot_dma_indx_set(dhd, flow_ring->wr,
                        H2D_IFRM_INDX_WR_UPD,
                        (flow_ring->idx - BCMPCIE_H2D_MSGRING_TXFLOW_IDX_START));
        } else {
                dhd_bus_cmn_writeshared(dhd->bus, &(flow_ring->wr),
                        sizeof(uint16), RING_WR_UPD, flow_ring->idx);
        }

        /* update control subn ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ctrl_ring, flow_resume_rqst, 1);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return BCME_OK;
} /* dhd_prot_flow_ring_create */

int
dhd_prot_flow_ring_batch_suspend_request(dhd_pub_t *dhd, uint16 *ringid, uint16 count)
{
        tx_idle_flowring_suspend_request_t *flow_suspend_rqst;
        dhd_prot_t *prot = dhd->prot;
        unsigned long flags;
        uint16 index;
        uint16 alloced = 0;
        msgbuf_ring_t *ring = &prot->h2dring_ctrl_subn;

        DHD_RING_LOCK(ring->ring_lock, flags);

        /* Request for ring buffer space */
        flow_suspend_rqst = (tx_idle_flowring_suspend_request_t *)
                dhd_prot_alloc_ring_space(dhd, ring, 1, &alloced, FALSE);

        if (flow_suspend_rqst == NULL) {
                DHD_RING_UNLOCK(ring->ring_lock, flags);
                DHD_ERROR(("%s: Flow suspend Req - failure ring space\n", __FUNCTION__));
                return BCME_NOMEM;
        }

        /* Common msg buf hdr */
        flow_suspend_rqst->msg.msg_type = MSG_TYPE_FLOW_RING_SUSPEND;
        /* flow_suspend_rqst->msg.if_id = (uint8)flow_ring_node->flow_info.ifindex; */
        flow_suspend_rqst->msg.request_id = htol32(0); /* TBD */

        flow_suspend_rqst->msg.epoch = ring->seqnum % H2D_EPOCH_MODULO;
        ring->seqnum++;

        /* Update flow id  info */
        for (index = 0; index < count; index++)
        {
                flow_suspend_rqst->ring_id[index] = ringid[index];
        }
        flow_suspend_rqst->num = count;

        DHD_ERROR(("%s sending batch suspend!! count is %d\n", __FUNCTION__, count));

        /* update ring's WR index and ring doorbell to dongle */
        dhd_prot_ring_write_complete(dhd, ring, flow_suspend_rqst, 1);

        DHD_RING_UNLOCK(ring->ring_lock, flags);

        return BCME_OK;
}
#endif /* IDLE_TX_FLOW_MGMT */

static const char* etd_trap_name(hnd_ext_tag_trap_t tag)
{
        switch (tag)
        {
        case TAG_TRAP_SIGNATURE: return "TAG_TRAP_SIGNATURE";
        case TAG_TRAP_STACK: return "TAG_TRAP_STACK";
        case TAG_TRAP_MEMORY: return "TAG_TRAP_MEMORY";
        case TAG_TRAP_DEEPSLEEP: return "TAG_TRAP_DEEPSLEEP";
        case TAG_TRAP_PSM_WD: return "TAG_TRAP_PSM_WD";
        case TAG_TRAP_PHY: return "TAG_TRAP_PHY";
        case TAG_TRAP_BUS: return "TAG_TRAP_BUS";
        case TAG_TRAP_MAC_SUSP: return "TAG_TRAP_MAC_SUSP";
        case TAG_TRAP_BACKPLANE: return "TAG_TRAP_BACKPLANE";
        case TAG_TRAP_PCIE_Q: return "TAG_TRAP_PCIE_Q";
        case TAG_TRAP_WLC_STATE: return "TAG_TRAP_WLC_STATE";
        case TAG_TRAP_MAC_WAKE: return "TAG_TRAP_MAC_WAKE";
        case TAG_TRAP_HMAP: return "TAG_TRAP_HMAP";
        case TAG_TRAP_PHYTXERR_THRESH: return "TAG_TRAP_PHYTXERR_THRESH";
        case TAG_TRAP_HC_DATA: return "TAG_TRAP_HC_DATA";
        case TAG_TRAP_LOG_DATA: return "TAG_TRAP_LOG_DATA";
        case TAG_TRAP_CODE: return "TAG_TRAP_CODE";
        case TAG_TRAP_LAST:
        default:
                return "Unknown";
        }
        return "Unknown";
}

int dhd_prot_dump_extended_trap(dhd_pub_t *dhdp, struct bcmstrbuf *b, bool raw)
{
        uint32 i;
        uint32 *ext_data;
        hnd_ext_trap_hdr_t *hdr;
        const bcm_tlv_t *tlv;
        const trap_t *tr;
        const uint32 *stack;
        const hnd_ext_trap_bp_err_t *bpe;
        uint32 raw_len;

        ext_data = dhdp->extended_trap_data;

        /* return if there is no extended trap data */
        if (!ext_data || !(dhdp->dongle_trap_data & D2H_DEV_EXT_TRAP_DATA))
        {
                bcm_bprintf(b, "%d (0x%x)", dhdp->dongle_trap_data, dhdp->dongle_trap_data);
                return BCME_OK;
        }

        bcm_bprintf(b, "Extended trap data\n");

        /* First word is original trap_data */
        bcm_bprintf(b, "trap_data = 0x%08x\n", *ext_data);
        ext_data++;

        /* Followed by the extended trap data header */
        hdr = (hnd_ext_trap_hdr_t *)ext_data;
        bcm_bprintf(b, "version: %d, len: %d\n", hdr->version, hdr->len);

        /* Dump a list of all tags found  before parsing data */
        bcm_bprintf(b, "\nTags Found:\n");
        for (i = 0; i < TAG_TRAP_LAST; i++) {
                tlv = bcm_parse_tlvs(hdr->data, hdr->len, i);
                if (tlv)
                        bcm_bprintf(b, "Tag: %d (%s), Length: %d\n", i, etd_trap_name(i), tlv->len);
        }

        if (raw)
        {
                raw_len = sizeof(hnd_ext_trap_hdr_t) + (hdr->len / 4) + (hdr->len % 4 ? 1 : 0);
                for (i = 0; i < raw_len; i++)
                {
                        bcm_bprintf(b, "0x%08x ", ext_data[i]);
                        if (i % 4 == 3)
                                bcm_bprintf(b, "\n");
                }
                return BCME_OK;
        }

        /* Extract the various supported TLVs from the extended trap data */
        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_CODE);
        if (tlv)
        {
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_CODE), tlv->len);
                bcm_bprintf(b, "ETD TYPE: %d\n", tlv->data[0]);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_SIGNATURE);
        if (tlv)
        {
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_SIGNATURE), tlv->len);
                tr = (const trap_t *)tlv->data;

                bcm_bprintf(b, "TRAP %x: pc %x, lr %x, sp %x, cpsr %x, spsr %x\n",
                       tr->type, tr->pc, tr->r14, tr->r13, tr->cpsr, tr->spsr);
                bcm_bprintf(b, "  r0 %x, r1 %x, r2 %x, r3 %x, r4 %x, r5 %x, r6 %x\n",
                       tr->r0, tr->r1, tr->r2, tr->r3, tr->r4, tr->r5, tr->r6);
                bcm_bprintf(b, "  r7 %x, r8 %x, r9 %x, r10 %x, r11 %x, r12 %x\n",
                       tr->r7, tr->r8, tr->r9, tr->r10, tr->r11, tr->r12);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_STACK);
        if (tlv)
        {
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_STACK), tlv->len);
                stack = (const uint32 *)tlv->data;
                for (i = 0; i < (uint32)(tlv->len / 4); i++)
                {
                        bcm_bprintf(b, "  0x%08x\n", *stack);
                        stack++;
                }
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_BACKPLANE);
        if (tlv)
        {
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_BACKPLANE), tlv->len);
                bpe = (const hnd_ext_trap_bp_err_t *)tlv->data;
                bcm_bprintf(b, " error: %x\n", bpe->error);
                bcm_bprintf(b, " coreid: %x\n", bpe->coreid);
                bcm_bprintf(b, " baseaddr: %x\n", bpe->baseaddr);
                bcm_bprintf(b, " ioctrl: %x\n", bpe->ioctrl);
                bcm_bprintf(b, " iostatus: %x\n", bpe->iostatus);
                bcm_bprintf(b, " resetctrl: %x\n", bpe->resetctrl);
                bcm_bprintf(b, " resetstatus: %x\n", bpe->resetstatus);
                bcm_bprintf(b, " errlogctrl: %x\n", bpe->errlogctrl);
                bcm_bprintf(b, " errlogdone: %x\n", bpe->errlogdone);
                bcm_bprintf(b, " errlogstatus: %x\n", bpe->errlogstatus);
                bcm_bprintf(b, " errlogaddrlo: %x\n", bpe->errlogaddrlo);
                bcm_bprintf(b, " errlogaddrhi: %x\n", bpe->errlogaddrhi);
                bcm_bprintf(b, " errlogid: %x\n", bpe->errlogid);
                bcm_bprintf(b, " errloguser: %x\n", bpe->errloguser);
                bcm_bprintf(b, " errlogflags: %x\n", bpe->errlogflags);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_MEMORY);
        if (tlv)
        {
                const hnd_ext_trap_heap_err_t* hme;

                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_MEMORY), tlv->len);
                hme = (const hnd_ext_trap_heap_err_t *)tlv->data;
                bcm_bprintf(b, " arena total: %d\n", hme->arena_total);
                bcm_bprintf(b, " heap free: %d\n", hme->heap_free);
                bcm_bprintf(b, " heap in use: %d\n", hme->heap_inuse);
                bcm_bprintf(b, " mf count: %d\n", hme->mf_count);
                bcm_bprintf(b, " stack LWM: %x\n", hme->stack_lwm);

                bcm_bprintf(b, " Histogram:\n");
                for (i = 0; i < (HEAP_HISTOGRAM_DUMP_LEN * 2); i += 2) {
                        if (hme->heap_histogm[i] == 0xfffe)
                                bcm_bprintf(b, " Others\t%d\t?\n", hme->heap_histogm[i + 1]);
                        else if (hme->heap_histogm[i] == 0xffff)
                                bcm_bprintf(b, " >= 256K\t%d\t?\n", hme->heap_histogm[i + 1]);
                        else
                                bcm_bprintf(b, " %d\t%d\t%d\n", hme->heap_histogm[i] << 2,
                                        hme->heap_histogm[i + 1], (hme->heap_histogm[i] << 2)
                                        * hme->heap_histogm[i + 1]);
                }

                bcm_bprintf(b, " Max free block: %d\n", hme->max_sz_free_blk[0] << 2);
                for (i = 1; i < HEAP_MAX_SZ_BLKS_LEN; i++) {
                        bcm_bprintf(b, " Next lgst free block: %d\n", hme->max_sz_free_blk[i] << 2);
                }
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_PCIE_Q);
        if (tlv)
        {
                const hnd_ext_trap_pcie_mem_err_t* pqme;

                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_PCIE_Q), tlv->len);
                pqme = (const hnd_ext_trap_pcie_mem_err_t *)tlv->data;
                bcm_bprintf(b, " d2h queue len: %x\n", pqme->d2h_queue_len);
                bcm_bprintf(b, " d2h req queue len: %x\n", pqme->d2h_req_queue_len);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_WLC_STATE);
        if (tlv)
        {
                const hnd_ext_trap_wlc_mem_err_t* wsme;

                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_WLC_STATE), tlv->len);
                wsme = (const hnd_ext_trap_wlc_mem_err_t *)tlv->data;
                bcm_bprintf(b, " instance: %d\n", wsme->instance);
                bcm_bprintf(b, " associated: %d\n", wsme->associated);
                bcm_bprintf(b, " peer count: %d\n", wsme->peer_cnt);
                bcm_bprintf(b, " client count: %d\n", wsme->soft_ap_client_cnt);
                bcm_bprintf(b, " TX_AC_BK_FIFO: %d\n", wsme->txqueue_len[0]);
                bcm_bprintf(b, " TX_AC_BE_FIFO: %d\n", wsme->txqueue_len[1]);
                bcm_bprintf(b, " TX_AC_VI_FIFO: %d\n", wsme->txqueue_len[2]);
                bcm_bprintf(b, " TX_AC_VO_FIFO: %d\n", wsme->txqueue_len[3]);

                if (tlv->len >= (sizeof(*wsme) * 2)) {
                        wsme++;
                        bcm_bprintf(b, "\n instance: %d\n", wsme->instance);
                        bcm_bprintf(b, " associated: %d\n", wsme->associated);
                        bcm_bprintf(b, " peer count: %d\n", wsme->peer_cnt);
                        bcm_bprintf(b, " client count: %d\n", wsme->soft_ap_client_cnt);
                        bcm_bprintf(b, " TX_AC_BK_FIFO: %d\n", wsme->txqueue_len[0]);
                        bcm_bprintf(b, " TX_AC_BE_FIFO: %d\n", wsme->txqueue_len[1]);
                        bcm_bprintf(b, " TX_AC_VI_FIFO: %d\n", wsme->txqueue_len[2]);
                        bcm_bprintf(b, " TX_AC_VO_FIFO: %d\n", wsme->txqueue_len[3]);
                }
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_PHY);
        if (tlv)
        {
                const hnd_ext_trap_phydbg_t* phydbg;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_PHY), tlv->len);
                phydbg = (const hnd_ext_trap_phydbg_t *)tlv->data;
                bcm_bprintf(b, " err: 0x%x\n", phydbg->err);
                bcm_bprintf(b, " RxFeStatus: 0x%x\n", phydbg->RxFeStatus);
                bcm_bprintf(b, " TxFIFOStatus0: 0x%x\n", phydbg->TxFIFOStatus0);
                bcm_bprintf(b, " TxFIFOStatus1: 0x%x\n", phydbg->TxFIFOStatus1);
                bcm_bprintf(b, " RfseqMode: 0x%x\n", phydbg->RfseqMode);
                bcm_bprintf(b, " RfseqStatus0: 0x%x\n", phydbg->RfseqStatus0);
                bcm_bprintf(b, " RfseqStatus1: 0x%x\n", phydbg->RfseqStatus1);
                bcm_bprintf(b, " RfseqStatus_Ocl: 0x%x\n", phydbg->RfseqStatus_Ocl);
                bcm_bprintf(b, " RfseqStatus_Ocl1: 0x%x\n", phydbg->RfseqStatus_Ocl1);
                bcm_bprintf(b, " OCLControl1: 0x%x\n", phydbg->OCLControl1);
                bcm_bprintf(b, " TxError: 0x%x\n", phydbg->TxError);
                bcm_bprintf(b, " bphyTxError: 0x%x\n", phydbg->bphyTxError);
                bcm_bprintf(b, " TxCCKError: 0x%x\n", phydbg->TxCCKError);
                bcm_bprintf(b, " TxCtrlWrd0: 0x%x\n", phydbg->TxCtrlWrd0);
                bcm_bprintf(b, " TxCtrlWrd1: 0x%x\n", phydbg->TxCtrlWrd1);
                bcm_bprintf(b, " TxCtrlWrd2: 0x%x\n", phydbg->TxCtrlWrd2);
                bcm_bprintf(b, " TxLsig0: 0x%x\n", phydbg->TxLsig0);
                bcm_bprintf(b, " TxLsig1: 0x%x\n", phydbg->TxLsig1);
                bcm_bprintf(b, " TxVhtSigA10: 0x%x\n", phydbg->TxVhtSigA10);
                bcm_bprintf(b, " TxVhtSigA11: 0x%x\n", phydbg->TxVhtSigA11);
                bcm_bprintf(b, " TxVhtSigA20: 0x%x\n", phydbg->TxVhtSigA20);
                bcm_bprintf(b, " TxVhtSigA21: 0x%x\n", phydbg->TxVhtSigA21);
                bcm_bprintf(b, " txPktLength: 0x%x\n", phydbg->txPktLength);
                bcm_bprintf(b, " txPsdulengthCtr: 0x%x\n", phydbg->txPsdulengthCtr);
                bcm_bprintf(b, " gpioClkControl: 0x%x\n", phydbg->gpioClkControl);
                bcm_bprintf(b, " gpioSel: 0x%x\n", phydbg->gpioSel);
                bcm_bprintf(b, " pktprocdebug: 0x%x\n", phydbg->pktprocdebug);
                for (i = 0; i < 3; i++)
                        bcm_bprintf(b, " gpioOut[%d]: 0x%x\n", i, phydbg->gpioOut[i]);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_PSM_WD);
        if (tlv)
        {
                const hnd_ext_trap_psmwd_t* psmwd;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_PSM_WD), tlv->len);
                psmwd = (const hnd_ext_trap_psmwd_t *)tlv;
                bcm_bprintf(b, " version: 0x%x\n", psmwd->version);
                bcm_bprintf(b, " maccontrol: 0x%x\n", psmwd->i32_maccontrol);
                bcm_bprintf(b, " maccommand: 0x%x\n", psmwd->i32_maccommand);
                bcm_bprintf(b, " macintstatus: 0x%x\n", psmwd->i32_macintstatus);
                bcm_bprintf(b, " phydebug: 0x%x\n", psmwd->i32_phydebug);
                bcm_bprintf(b, " clk_ctl_st: 0x%x\n", psmwd->i32_clk_ctl_st);
                for (i = 0; i < 3; i++)
                        bcm_bprintf(b, " psmdebug[%d]: 0x%x\n", i, psmwd->i32_psmdebug[i]);
                bcm_bprintf(b, " gated clock en: 0x%x\n", psmwd->i16_0x1a8);
                bcm_bprintf(b, " Rcv Fifo Ctrl: 0x%x\n", psmwd->i16_0x406);
                bcm_bprintf(b, " Rx ctrl 1: 0x%x\n", psmwd->i16_0x408);
                bcm_bprintf(b, " Rxe Status 1: 0x%x\n", psmwd->i16_0x41a);
                bcm_bprintf(b, " Rxe Status 2: 0x%x\n", psmwd->i16_0x41c);
                bcm_bprintf(b, " rcv wrd count 0: 0x%x\n", psmwd->i16_0x424);
                bcm_bprintf(b, " rcv wrd count 1: 0x%x\n", psmwd->i16_0x426);
                bcm_bprintf(b, " RCV_LFIFO_STS: 0x%x\n", psmwd->i16_0x456);
                bcm_bprintf(b, " PSM_SLP_TMR: 0x%x\n", psmwd->i16_0x480);
                bcm_bprintf(b, " PSM BRC: 0x%x\n", psmwd->i16_0x490);
                bcm_bprintf(b, " TXE CTRL: 0x%x\n", psmwd->i16_0x500);
                bcm_bprintf(b, " TXE Status: 0x%x\n", psmwd->i16_0x50e);
                bcm_bprintf(b, " TXE_xmtdmabusy: 0x%x\n", psmwd->i16_0x55e);
                bcm_bprintf(b, " TXE_XMTfifosuspflush: 0x%x\n", psmwd->i16_0x566);
                bcm_bprintf(b, " IFS Stat: 0x%x\n", psmwd->i16_0x690);
                bcm_bprintf(b, " IFS_MEDBUSY_CTR: 0x%x\n", psmwd->i16_0x692);
                bcm_bprintf(b, " IFS_TX_DUR: 0x%x\n", psmwd->i16_0x694);
                bcm_bprintf(b, " SLow_CTL: 0x%x\n", psmwd->i16_0x6a0);
                bcm_bprintf(b, " TXE_AQM fifo Ready: 0x%x\n", psmwd->i16_0x838);
                bcm_bprintf(b, " Dagg ctrl: 0x%x\n", psmwd->i16_0x8c0);
                bcm_bprintf(b, " shm_prewds_cnt: 0x%x\n", psmwd->shm_prewds_cnt);
                bcm_bprintf(b, " shm_txtplufl_cnt: 0x%x\n", psmwd->shm_txtplufl_cnt);
                bcm_bprintf(b, " shm_txphyerr_cnt: 0x%x\n", psmwd->shm_txphyerr_cnt);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_MAC_SUSP);
        if (tlv)
        {
                const hnd_ext_trap_macsusp_t* macsusp;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_MAC_SUSP), tlv->len);
                macsusp = (const hnd_ext_trap_macsusp_t *)tlv;
                bcm_bprintf(b, " version: %d\n", macsusp->version);
                bcm_bprintf(b, " trap_reason: %d\n", macsusp->trap_reason);
                bcm_bprintf(b, " maccontrol: 0x%x\n", macsusp->i32_maccontrol);
                bcm_bprintf(b, " maccommand: 0x%x\n", macsusp->i32_maccommand);
                bcm_bprintf(b, " macintstatus: 0x%x\n", macsusp->i32_macintstatus);
                for (i = 0; i < 4; i++)
                        bcm_bprintf(b, " phydebug[%d]: 0x%x\n", i, macsusp->i32_phydebug[i]);
                for (i = 0; i < 8; i++)
                        bcm_bprintf(b, " psmdebug[%d]: 0x%x\n", i, macsusp->i32_psmdebug[i]);
                bcm_bprintf(b, " Rxe Status_1: 0x%x\n", macsusp->i16_0x41a);
                bcm_bprintf(b, " Rxe Status_2: 0x%x\n", macsusp->i16_0x41c);
                bcm_bprintf(b, " PSM BRC: 0x%x\n", macsusp->i16_0x490);
                bcm_bprintf(b, " TXE Status: 0x%x\n", macsusp->i16_0x50e);
                bcm_bprintf(b, " TXE xmtdmabusy: 0x%x\n", macsusp->i16_0x55e);
                bcm_bprintf(b, " TXE XMTfifosuspflush: 0x%x\n", macsusp->i16_0x566);
                bcm_bprintf(b, " IFS Stat: 0x%x\n", macsusp->i16_0x690);
                bcm_bprintf(b, " IFS MEDBUSY CTR: 0x%x\n", macsusp->i16_0x692);
                bcm_bprintf(b, " IFS TX DUR: 0x%x\n", macsusp->i16_0x694);
                bcm_bprintf(b, " WEP CTL: 0x%x\n", macsusp->i16_0x7c0);
                bcm_bprintf(b, " TXE AQM fifo Ready: 0x%x\n", macsusp->i16_0x838);
                bcm_bprintf(b, " MHP status: 0x%x\n", macsusp->i16_0x880);
                bcm_bprintf(b, " shm_prewds_cnt: 0x%x\n", macsusp->shm_prewds_cnt);
                bcm_bprintf(b, " shm_ucode_dbgst: 0x%x\n", macsusp->shm_ucode_dbgst);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_MAC_WAKE);
        if (tlv)
        {
                const hnd_ext_trap_macenab_t* macwake;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_MAC_WAKE), tlv->len);
                macwake = (const hnd_ext_trap_macenab_t *)tlv;
                bcm_bprintf(b, " version: 0x%x\n", macwake->version);
                bcm_bprintf(b, " trap_reason: 0x%x\n", macwake->trap_reason);
                bcm_bprintf(b, " maccontrol: 0x%x\n", macwake->i32_maccontrol);
                bcm_bprintf(b, " maccommand: 0x%x\n", macwake->i32_maccommand);
                bcm_bprintf(b, " macintstatus: 0x%x\n", macwake->i32_macintstatus);
                for (i = 0; i < 8; i++)
                        bcm_bprintf(b, " psmdebug[%d]: 0x%x\n", i, macwake->i32_psmdebug[i]);
                bcm_bprintf(b, " clk_ctl_st: 0x%x\n", macwake->i32_clk_ctl_st);
                bcm_bprintf(b, " powerctl: 0x%x\n", macwake->i32_powerctl);
                bcm_bprintf(b, " gated clock en: 0x%x\n", macwake->i16_0x1a8);
                bcm_bprintf(b, " PSM_SLP_TMR: 0x%x\n", macwake->i16_0x480);
                bcm_bprintf(b, " PSM BRC: 0x%x\n", macwake->i16_0x490);
                bcm_bprintf(b, " TSF CTL: 0x%x\n", macwake->i16_0x600);
                bcm_bprintf(b, " IFS Stat: 0x%x\n", macwake->i16_0x690);
                bcm_bprintf(b, " IFS_MEDBUSY_CTR: 0x%x\n", macwake->i16_0x692);
                bcm_bprintf(b, " Slow_CTL: 0x%x\n", macwake->i16_0x6a0);
                bcm_bprintf(b, " Slow_FRAC: 0x%x\n", macwake->i16_0x6a6);
                bcm_bprintf(b, " fast power up delay: 0x%x\n", macwake->i16_0x6a8);
                bcm_bprintf(b, " Slow_PER: 0x%x\n", macwake->i16_0x6aa);
                bcm_bprintf(b, " shm_ucode_dbgst: 0x%x\n", macwake->shm_ucode_dbgst);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_BUS);
        if (tlv)
        {
                const bcm_dngl_pcie_hc_t* hc;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_BUS), tlv->len);
                hc = (const bcm_dngl_pcie_hc_t *)tlv->data;
                bcm_bprintf(b, " version: 0x%x\n", hc->version);
                bcm_bprintf(b, " reserved: 0x%x\n", hc->reserved);
                bcm_bprintf(b, " pcie_err_ind_type: 0x%x\n", hc->pcie_err_ind_type);
                bcm_bprintf(b, " pcie_flag: 0x%x\n", hc->pcie_flag);
                bcm_bprintf(b, " pcie_control_reg: 0x%x\n", hc->pcie_control_reg);
                for (i = 0; i < HC_PCIEDEV_CONFIG_REGLIST_MAX; i++)
                        bcm_bprintf(b, " pcie_config_regs[%d]: 0x%x\n", i, hc->pcie_config_regs[i]);
        }

        tlv = bcm_parse_tlvs(hdr->data, hdr->len, TAG_TRAP_HMAP);
        if (tlv)
        {
                const pcie_hmapviolation_t* hmap;
                hmap = (const pcie_hmapviolation_t *)tlv->data;
                bcm_bprintf(b, "\n%s len: %d\n", etd_trap_name(TAG_TRAP_HMAP), tlv->len);
                bcm_bprintf(b, " HMAP Vio Addr Low: 0x%x\n", hmap->hmap_violationaddr_lo);
                bcm_bprintf(b, " HMAP Vio Addr Hi: 0x%x\n", hmap->hmap_violationaddr_hi);
                bcm_bprintf(b, " HMAP Vio Info: 0x%x\n", hmap->hmap_violation_info);
        }

        return BCME_OK;
}

#ifdef BCMPCIE
int
dhd_prot_send_host_timestamp(dhd_pub_t *dhdp, uchar *tlvs, uint16 tlv_len,
        uint16 seqnum, uint16 xt_id)
{
        dhd_prot_t *prot = dhdp->prot;
        host_timestamp_msg_t *ts_req;
        unsigned long flags;
        uint16 alloced = 0;
        uchar *ts_tlv_buf;
        msgbuf_ring_t *ctrl_ring = &prot->h2dring_ctrl_subn;

        if ((tlvs == NULL) || (tlv_len == 0)) {
                DHD_ERROR(("%s: argument error tlv: %p, tlv_len %d\n",
                        __FUNCTION__, tlvs, tlv_len));
                return -1;
        }

        DHD_RING_LOCK(ctrl_ring->ring_lock, flags);

        /* if Host TS req already pending go away */
        if (prot->hostts_req_buf_inuse == TRUE) {
                DHD_ERROR(("one host TS request already pending at device\n"));
                DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);
                return -1;
        }

        /* Request for cbuf space */
        ts_req = (host_timestamp_msg_t*)dhd_prot_alloc_ring_space(dhdp, ctrl_ring,
                DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D, &alloced, FALSE);
        if (ts_req == NULL) {
                DHD_ERROR(("couldn't allocate space on msgring to send host TS request\n"));
                DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);
                return -1;
        }

        /* Common msg buf hdr */
        ts_req->msg.msg_type = MSG_TYPE_HOSTTIMSTAMP;
        ts_req->msg.if_id = 0;
        ts_req->msg.flags =  ctrl_ring->current_phase;
        ts_req->msg.request_id = DHD_H2D_HOSTTS_REQ_PKTID;

        ts_req->msg.epoch = ctrl_ring->seqnum % H2D_EPOCH_MODULO;
        ctrl_ring->seqnum++;

        ts_req->xt_id = xt_id;
        ts_req->seqnum = seqnum;
        /* populate TS req buffer info */
        ts_req->input_data_len = htol16(tlv_len);
        ts_req->host_buf_addr.high = htol32(PHYSADDRHI(prot->hostts_req_buf.pa));
        ts_req->host_buf_addr.low = htol32(PHYSADDRLO(prot->hostts_req_buf.pa));
        /* copy ioct payload */
        ts_tlv_buf = (void *) prot->hostts_req_buf.va;
        prot->hostts_req_buf_inuse = TRUE;
        memcpy(ts_tlv_buf, tlvs, tlv_len);

        OSL_CACHE_FLUSH((void *) prot->hostts_req_buf.va, tlv_len);

        if (ISALIGNED(ts_tlv_buf, DMA_ALIGN_LEN) == FALSE) {
                DHD_ERROR(("host TS req buffer address unaligned !!!!! \n"));
        }

        DHD_CTL(("submitted Host TS request request_id %d, data_len %d, tx_id %d, seq %d\n",
                ts_req->msg.request_id, ts_req->input_data_len,
                ts_req->xt_id, ts_req->seqnum));

        /* upd wrt ptr and raise interrupt */
        dhd_prot_ring_write_complete(dhdp, ctrl_ring, ts_req,
                DHD_FLOWRING_DEFAULT_NITEMS_POSTED_H2D);

        DHD_RING_UNLOCK(ctrl_ring->ring_lock, flags);

        return 0;
} /* dhd_prot_send_host_timestamp */

bool
dhd_prot_data_path_tx_timestamp_logging(dhd_pub_t *dhd,  bool enable, bool set)
{
        if (set)
                dhd->prot->tx_ts_log_enabled = enable;

        return dhd->prot->tx_ts_log_enabled;
}

bool
dhd_prot_data_path_rx_timestamp_logging(dhd_pub_t *dhd,  bool enable, bool set)
{
        if (set)
                dhd->prot->rx_ts_log_enabled = enable;

        return dhd->prot->rx_ts_log_enabled;
}

bool
dhd_prot_pkt_noretry(dhd_pub_t *dhd, bool enable, bool set)
{
        if (set)
                dhd->prot->no_retry = enable;

        return dhd->prot->no_retry;
}

bool
dhd_prot_pkt_noaggr(dhd_pub_t *dhd, bool enable, bool set)
{
        if (set)
                dhd->prot->no_aggr = enable;

        return dhd->prot->no_aggr;
}

bool
dhd_prot_pkt_fixed_rate(dhd_pub_t *dhd, bool enable, bool set)
{
        if (set)
                dhd->prot->fixed_rate = enable;

        return dhd->prot->fixed_rate;
}
#endif /* BCMPCIE */

void
dhd_prot_dma_indx_free(dhd_pub_t *dhd)
{
        dhd_prot_t *prot = dhd->prot;

        dhd_dma_buf_free(dhd, &prot->h2d_dma_indx_wr_buf);
        dhd_dma_buf_free(dhd, &prot->d2h_dma_indx_rd_buf);
}

void
dhd_msgbuf_delay_post_ts_bufs(dhd_pub_t *dhd)
{
        if (dhd->prot->max_tsbufpost > 0)
                dhd_msgbuf_rxbuf_post_ts_bufs(dhd);
}

static void BCMFASTPATH
dhd_prot_process_fw_timestamp(dhd_pub_t *dhd, void* buf)
{
        DHD_ERROR(("Timesunc feature not compiled in but GOT FW TS message\n"));

}

uint16
dhd_prot_get_ioctl_trans_id(dhd_pub_t *dhdp)
{
        return dhdp->prot->ioctl_trans_id;
}