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/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#define FC_MAX_HOLD_RSCN     32       /* max number of deferred RSCNs */
#define FC_MAX_NS_RSP        65536    /* max size NameServer rsp */
#define FC_MAXLOOP           126      /* max devices supported on a fc loop */
#define LPFC_DISC_FLOGI_TMO  10       /* Discovery FLOGI ratov */


/* This is the protocol dependent definition for a Node List Entry.
 * This is used by Fibre Channel protocol to support FCP.
 */

/* worker thread events */
enum lpfc_work_type {
        LPFC_EVT_ONLINE,
        LPFC_EVT_OFFLINE_PREP,
        LPFC_EVT_OFFLINE,
        LPFC_EVT_WARM_START,
        LPFC_EVT_KILL,
        LPFC_EVT_ELS_RETRY,
        LPFC_EVT_DEV_LOSS,
        LPFC_EVT_FASTPATH_MGMT_EVT,
};

/* structure used to queue event to the discovery tasklet */
struct lpfc_work_evt {
        struct list_head      evt_listp;
        void                 *evt_arg1;
        void                 *evt_arg2;
        enum lpfc_work_type   evt;
};

struct lpfc_scsi_check_condition_event;
struct lpfc_scsi_varqueuedepth_event;
struct lpfc_scsi_event_header;
struct lpfc_fabric_event_header;
struct lpfc_fcprdchkerr_event;

/* structure used for sending events from fast path */
struct lpfc_fast_path_event {
        struct lpfc_work_evt work_evt;
        struct lpfc_vport     *vport;
        union {
                struct lpfc_scsi_check_condition_event check_cond_evt;
                struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
                struct lpfc_scsi_event_header scsi_evt;
                struct lpfc_fabric_event_header fabric_evt;
                struct lpfc_fcprdchkerr_event read_check_error;
        } un;
};

struct lpfc_nodelist {
        struct list_head nlp_listp;
        struct lpfc_name nlp_portname;
        struct lpfc_name nlp_nodename;
        uint32_t         nlp_flag;              /* entry  flags */
        uint32_t         nlp_DID;               /* FC D_ID of entry */
        uint32_t         nlp_last_elscmd;       /* Last ELS cmd sent */
        uint16_t         nlp_type;
#define NLP_FC_NODE        0x1                  /* entry is an FC node */
#define NLP_FABRIC         0x4                  /* entry rep a Fabric entity */
#define NLP_FCP_TARGET     0x8                  /* entry is an FCP target */
#define NLP_FCP_INITIATOR  0x10                 /* entry is an FCP Initiator */

        uint16_t        nlp_rpi;
        uint16_t        nlp_state;              /* state transition indicator */
        uint16_t        nlp_prev_state;         /* state transition indicator */
        uint16_t        nlp_xri;                /* output exchange id for RPI */
        uint16_t        nlp_sid;                /* scsi id */
#define NLP_NO_SID              0xffff
        uint16_t        nlp_maxframe;           /* Max RCV frame size */
        uint8_t         nlp_class_sup;          /* Supported Classes */
        uint8_t         nlp_retry;              /* used for ELS retries */
        uint8_t         nlp_fcp_info;           /* class info, bits 0-3 */
#define NLP_FCP_2_DEVICE   0x10                 /* FCP-2 device */

        uint16_t        nlp_usg_map;    /* ndlp management usage bitmap */
#define NLP_USG_NODE_ACT_BIT    0x1     /* Indicate ndlp is actively used */
#define NLP_USG_IACT_REQ_BIT    0x2     /* Request to inactivate ndlp */
#define NLP_USG_FREE_REQ_BIT    0x4     /* Request to invoke ndlp memory free */
#define NLP_USG_FREE_ACK_BIT    0x8     /* Indicate ndlp memory free invoked */

        struct timer_list   nlp_delayfunc;      /* Used for delayed ELS cmds */
        struct lpfc_hba *phba;
        struct fc_rport *rport;                 /* Corresponding FC transport
                                                   port structure */
        struct lpfc_vport *vport;
        struct lpfc_work_evt els_retry_evt;
        struct lpfc_work_evt dev_loss_evt;
        unsigned long last_ramp_up_time;        /* jiffy of last ramp up */
        unsigned long last_q_full_time;         /* jiffy of last queue full */
        struct kref     kref;
        atomic_t cmd_pending;
        uint32_t cmd_qdepth;
        unsigned long last_change_time;
        struct lpfc_scsicmd_bkt *lat_data;      /* Latency data */
};

/* Defines for nlp_flag (uint32) */
#define NLP_PLOGI_SND      0x00000020   /* sent PLOGI request for this entry */
#define NLP_PRLI_SND       0x00000040   /* sent PRLI request for this entry */
#define NLP_ADISC_SND      0x00000080   /* sent ADISC request for this entry */
#define NLP_LOGO_SND       0x00000100   /* sent LOGO request for this entry */
#define NLP_RNID_SND       0x00000400   /* sent RNID request for this entry */
#define NLP_ELS_SND_MASK   0x000007e0   /* sent ELS request for this entry */
#define NLP_DEFER_RM       0x00010000   /* Remove this ndlp if no longer used */
#define NLP_DELAY_TMO      0x00020000   /* delay timeout is running for node */
#define NLP_NPR_2B_DISC    0x00040000   /* node is included in num_disc_nodes */
#define NLP_RCV_PLOGI      0x00080000   /* Rcv'ed PLOGI from remote system */
#define NLP_LOGO_ACC       0x00100000   /* Process LOGO after ACC completes */
#define NLP_TGT_NO_SCSIID  0x00200000   /* good PRLI but no binding for scsid */
#define NLP_ACC_REGLOGIN   0x01000000   /* Issue Reg Login after successful
                                           ACC */
#define NLP_NPR_ADISC      0x02000000   /* Issue ADISC when dq'ed from
                                           NPR list */
#define NLP_RM_DFLT_RPI    0x04000000   /* need to remove leftover dflt RPI */
#define NLP_NODEV_REMOVE   0x08000000   /* Defer removal till discovery ends */
#define NLP_TARGET_REMOVE  0x10000000   /* Target remove in process */
#define NLP_SC_REQ         0x20000000   /* Target requires authentication */
#define NLP_RPI_VALID      0x80000000   /* nlp_rpi is valid */

/* ndlp usage management macros */
#define NLP_CHK_NODE_ACT(ndlp)          (((ndlp)->nlp_usg_map \
                                                & NLP_USG_NODE_ACT_BIT) \
                                        && \
                                        !((ndlp)->nlp_usg_map \
                                                & NLP_USG_FREE_ACK_BIT))
#define NLP_SET_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
                                                |= NLP_USG_NODE_ACT_BIT)
#define NLP_INT_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
                                                = NLP_USG_NODE_ACT_BIT)
#define NLP_CLR_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
                                                &= ~NLP_USG_NODE_ACT_BIT)
#define NLP_CHK_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
                                                & NLP_USG_IACT_REQ_BIT)
#define NLP_SET_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
                                                |= NLP_USG_IACT_REQ_BIT)
#define NLP_CHK_FREE_REQ(ndlp)          ((ndlp)->nlp_usg_map \
                                                & NLP_USG_FREE_REQ_BIT)
#define NLP_SET_FREE_REQ(ndlp)          ((ndlp)->nlp_usg_map \
                                                |= NLP_USG_FREE_REQ_BIT)
#define NLP_CHK_FREE_ACK(ndlp)          ((ndlp)->nlp_usg_map \
                                                & NLP_USG_FREE_ACK_BIT)
#define NLP_SET_FREE_ACK(ndlp)          ((ndlp)->nlp_usg_map \
                                                |= NLP_USG_FREE_ACK_BIT)

/* There are 4 different double linked lists nodelist entries can reside on.
 * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
 * when Link Up discovery or Registered State Change Notification (RSCN)
 * processing is needed.  Each list holds the nodes that require a PLOGI or
 * ADISC Extended Link Service (ELS) request.  These lists keep track of the
 * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
 * by Link Up) event.  The unmapped_list contains all nodes that have
 * successfully logged into at the Fibre Channel level.  The
 * mapped_list will contain all nodes that are mapped FCP targets.
 *
 * The bind list is a list of undiscovered (potentially non-existent) nodes
 * that we have saved binding information on. This information is used when
 * nodes transition from the unmapped to the mapped list.
 */

/* Defines for nlp_state */
#define NLP_STE_UNUSED_NODE       0x0   /* node is just allocated */
#define NLP_STE_PLOGI_ISSUE       0x1   /* PLOGI was sent to NL_PORT */
#define NLP_STE_ADISC_ISSUE       0x2   /* ADISC was sent to NL_PORT */
#define NLP_STE_REG_LOGIN_ISSUE   0x3   /* REG_LOGIN was issued for NL_PORT */
#define NLP_STE_PRLI_ISSUE        0x4   /* PRLI was sent to NL_PORT */
#define NLP_STE_UNMAPPED_NODE     0x5   /* PRLI completed from NL_PORT */
#define NLP_STE_MAPPED_NODE       0x6   /* Identified as a FCP Target */
#define NLP_STE_NPR_NODE          0x7   /* NPort disappeared */
#define NLP_STE_MAX_STATE         0x8
#define NLP_STE_FREED_NODE        0xff  /* node entry was freed to MEM_NLP */

/* For UNUSED_NODE state, the node has just been allocated.
 * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
 * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
 * and put on the unmapped list. For ADISC processing, the node is taken off
 * the ADISC list and placed on either the mapped or unmapped list (depending
 * on its previous state). Once on the unmapped list, a PRLI is issued and the
 * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
 * changed to PRLI_COMPL. If the completion indicates a mapped
 * node, the node is taken off the unmapped list. The binding list is checked
 * for a valid binding, or a binding is automatically assigned. If binding
 * assignment is unsuccessful, the node is left on the unmapped list. If
 * binding assignment is successful, the associated binding list entry (if
 * any) is removed, and the node is placed on the mapped list.
 */
/*
 * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
 * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
 * expire, all effected nodes will receive a DEVICE_RM event.
 */
/*
 * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
 * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
 * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
 * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
 * we will first process the ADISC list.  32 entries are processed initially and
 * ADISC is initited for each one.  Completions / Events for each node are
 * funnelled thru the state machine.  As each node finishes ADISC processing, it
 * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
 * waiting, and the ADISC list count is identically 0, then we are done. For
 * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
 * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
 * list.  32 entries are processed initially and PLOGI is initited for each one.
 * Completions / Events for each node are funnelled thru the state machine.  As
 * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
 * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
 * identically 0, then we are done. We have now completed discovery / RSCN
 * handling. Upon completion, ALL nodes should be on either the mapped or
 * unmapped lists.
 */

/* Defines for Node List Entry Events that could happen */
#define NLP_EVT_RCV_PLOGI         0x0   /* Rcv'd an ELS PLOGI command */
#define NLP_EVT_RCV_PRLI          0x1   /* Rcv'd an ELS PRLI  command */
#define NLP_EVT_RCV_LOGO          0x2   /* Rcv'd an ELS LOGO  command */
#define NLP_EVT_RCV_ADISC         0x3   /* Rcv'd an ELS ADISC command */
#define NLP_EVT_RCV_PDISC         0x4   /* Rcv'd an ELS PDISC command */
#define NLP_EVT_RCV_PRLO          0x5   /* Rcv'd an ELS PRLO  command */
#define NLP_EVT_CMPL_PLOGI        0x6   /* Sent an ELS PLOGI command */
#define NLP_EVT_CMPL_PRLI         0x7   /* Sent an ELS PRLI  command */
#define NLP_EVT_CMPL_LOGO         0x8   /* Sent an ELS LOGO  command */
#define NLP_EVT_CMPL_ADISC        0x9   /* Sent an ELS ADISC command */
#define NLP_EVT_CMPL_REG_LOGIN    0xa   /* REG_LOGIN mbox cmd completed */
#define NLP_EVT_DEVICE_RM         0xb   /* Device not found in NS / ALPAmap */
#define NLP_EVT_DEVICE_RECOVERY   0xc   /* Device existence unknown */
#define NLP_EVT_MAX_EVENT         0xd