From bc3157dde35ac3b2ec12229edcfaca58cd7925c0 Mon Sep 17 00:00:00 2001 From: Chris Kelly Date: Mon, 20 Feb 2012 21:11:37 +0000 Subject: [PATCH] staging: ozwpan: Added device state support Added support for maintaining state and data buffering for devices connected via the network. Signed-off-by: Chris Kelly Signed-off-by: Greg Kroah-Hartman --- drivers/staging/ozwpan/ozeltbuf.c | 339 ++++++++++++ drivers/staging/ozwpan/ozeltbuf.h | 70 +++ drivers/staging/ozwpan/ozpd.c | 835 ++++++++++++++++++++++++++++++ drivers/staging/ozwpan/ozpd.h | 121 +++++ 4 files changed, 1365 insertions(+) create mode 100644 drivers/staging/ozwpan/ozeltbuf.c create mode 100644 drivers/staging/ozwpan/ozeltbuf.h create mode 100644 drivers/staging/ozwpan/ozpd.c create mode 100644 drivers/staging/ozwpan/ozpd.h diff --git a/drivers/staging/ozwpan/ozeltbuf.c b/drivers/staging/ozwpan/ozeltbuf.c new file mode 100644 index 000000000000..1c96c0033d76 --- /dev/null +++ b/drivers/staging/ozwpan/ozeltbuf.c @@ -0,0 +1,339 @@ +/* ----------------------------------------------------------------------------- + * Copyright (c) 2011 Ozmo Inc + * Released under the GNU General Public License Version 2 (GPLv2). + * ----------------------------------------------------------------------------- + */ +#include +#include +#include +#include "ozconfig.h" +#include "ozprotocol.h" +#include "ozeltbuf.h" +#include "ozpd.h" +#include "oztrace.h" +#include "ozalloc.h" +/*------------------------------------------------------------------------------ + */ +#define OZ_ELT_INFO_MAGIC_USED 0x35791057 +#define OZ_ELT_INFO_MAGIC_FREE 0x78940102 +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +int oz_elt_buf_init(struct oz_elt_buf *buf) +{ + memset(buf, 0, sizeof(struct oz_elt_buf)); + INIT_LIST_HEAD(&buf->stream_list); + INIT_LIST_HEAD(&buf->order_list); + INIT_LIST_HEAD(&buf->isoc_list); + buf->max_free_elts = 32; + spin_lock_init(&buf->lock); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_elt_buf_term(struct oz_elt_buf *buf) +{ + struct list_head *e; + int i; + /* Free any elements in the order or isoc lists. */ + for (i = 0; i < 2; i++) { + struct list_head *list; + if (i) + list = &buf->order_list; + else + list = &buf->isoc_list; + e = list->next; + while (e != list) { + struct oz_elt_info *ei = + container_of(e, struct oz_elt_info, link_order); + e = e->next; + oz_free(ei); + } + } + /* Free any elelment in the pool. */ + while (buf->elt_pool) { + struct oz_elt_info *ei = + container_of(buf->elt_pool, struct oz_elt_info, link); + buf->elt_pool = buf->elt_pool->next; + oz_free(ei); + } + buf->free_elts = 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +struct oz_elt_info *oz_elt_info_alloc(struct oz_elt_buf *buf) +{ + struct oz_elt_info *ei = 0; + spin_lock_bh(&buf->lock); + if (buf->free_elts && buf->elt_pool) { + ei = container_of(buf->elt_pool, struct oz_elt_info, link); + buf->elt_pool = ei->link.next; + buf->free_elts--; + spin_unlock_bh(&buf->lock); + if (ei->magic != OZ_ELT_INFO_MAGIC_FREE) { + oz_trace("oz_elt_info_alloc: ei with bad magic: 0x%x\n", + ei->magic); + } + } else { + spin_unlock_bh(&buf->lock); + ei = oz_alloc(sizeof(struct oz_elt_info), GFP_ATOMIC); + } + if (ei) { + ei->flags = 0; + ei->app_id = 0; + ei->callback = 0; + ei->context = 0; + ei->stream = 0; + ei->magic = OZ_ELT_INFO_MAGIC_USED; + INIT_LIST_HEAD(&ei->link); + INIT_LIST_HEAD(&ei->link_order); + } + return ei; +} +/*------------------------------------------------------------------------------ + * Precondition: oz_elt_buf.lock must be held. + * Context: softirq or process + */ +void oz_elt_info_free(struct oz_elt_buf *buf, struct oz_elt_info *ei) +{ + if (ei) { + if (ei->magic == OZ_ELT_INFO_MAGIC_USED) { + buf->free_elts++; + ei->link.next = buf->elt_pool; + buf->elt_pool = &ei->link; + ei->magic = OZ_ELT_INFO_MAGIC_FREE; + } else { + oz_trace("oz_elt_info_free: bad magic ei: %p" + " magic: 0x%x\n", + ei, ei->magic); + } + } +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +void oz_elt_info_free_chain(struct oz_elt_buf *buf, struct list_head *list) +{ + struct list_head *e; + e = list->next; + spin_lock_bh(&buf->lock); + while (e != list) { + struct oz_elt_info *ei; + ei = container_of(e, struct oz_elt_info, link); + e = e->next; + oz_elt_info_free(buf, ei); + } + spin_unlock_bh(&buf->lock); +} +/*------------------------------------------------------------------------------ + */ +int oz_elt_stream_create(struct oz_elt_buf *buf, u8 id, int max_buf_count) +{ + struct oz_elt_stream *st = + oz_alloc(sizeof(struct oz_elt_stream), GFP_ATOMIC | __GFP_ZERO); + oz_trace("oz_elt_stream_create(0x%x)\n", id); + if (st == 0) + return -1; + memset(st, 0, sizeof(struct oz_elt_stream)); + atomic_set(&st->ref_count, 1); + st->id = id; + st->max_buf_count = max_buf_count; + INIT_LIST_HEAD(&st->elt_list); + spin_lock_bh(&buf->lock); + list_add_tail(&st->link, &buf->stream_list); + spin_unlock_bh(&buf->lock); + return 0; +} +/*------------------------------------------------------------------------------ + */ +int oz_elt_stream_delete(struct oz_elt_buf *buf, u8 id) +{ + struct list_head *e; + struct oz_elt_stream *st; + oz_trace("oz_elt_stream_delete(0x%x)\n", id); + spin_lock_bh(&buf->lock); + e = buf->stream_list.next; + while (e != &buf->stream_list) { + st = container_of(e, struct oz_elt_stream, link); + if (st->id == id) { + list_del(e); + break; + } + st = 0; + } + if (!st) { + spin_unlock_bh(&buf->lock); + return -1; + } + e = st->elt_list.next; + while (e != &st->elt_list) { + struct oz_elt_info *ei = + container_of(e, struct oz_elt_info, link); + e = e->next; + list_del_init(&ei->link); + list_del_init(&ei->link_order); + st->buf_count -= ei->length; + oz_trace2(OZ_TRACE_STREAM, "Stream down: %d %d %d\n", + st->buf_count, + ei->length, atomic_read(&st->ref_count)); + oz_elt_stream_put(st); + oz_elt_info_free(buf, ei); + } + spin_unlock_bh(&buf->lock); + oz_elt_stream_put(st); + return 0; +} +/*------------------------------------------------------------------------------ + */ +void oz_elt_stream_get(struct oz_elt_stream *st) +{ + atomic_inc(&st->ref_count); +} +/*------------------------------------------------------------------------------ + */ +void oz_elt_stream_put(struct oz_elt_stream *st) +{ + if (atomic_dec_and_test(&st->ref_count)) { + oz_trace("Stream destroyed\n"); + oz_free(st); + } +} +/*------------------------------------------------------------------------------ + * Precondition: Element buffer lock must be held. + * If this function fails the caller is responsible for deallocating the elt + * info structure. + */ +int oz_queue_elt_info(struct oz_elt_buf *buf, u8 isoc, u8 id, + struct oz_elt_info *ei) +{ + struct oz_elt_stream *st = 0; + struct list_head *e; + if (id) { + list_for_each(e, &buf->stream_list) { + st = container_of(e, struct oz_elt_stream, link); + if (st->id == id) + break; + } + if (e == &buf->stream_list) { + /* Stream specified but stream not known so fail. + * Caller deallocates element info. */ + return -1; + } + } + if (st) { + /* If this is an ISOC fixed element that needs a frame number + * then insert that now. Earlier we stored the unit count in + * this field. + */ + struct oz_isoc_fixed *body = (struct oz_isoc_fixed *) + &ei->data[sizeof(struct oz_elt)]; + if ((body->app_id == OZ_APPID_USB) && (body->type + == OZ_USB_ENDPOINT_DATA) && + (body->format == OZ_DATA_F_ISOC_FIXED)) { + u8 unit_count = body->frame_number; + body->frame_number = st->frame_number; + st->frame_number += unit_count; + } + /* Claim stream and update accounts */ + oz_elt_stream_get(st); + ei->stream = st; + st->buf_count += ei->length; + /* Add to list in stream. */ + list_add_tail(&ei->link, &st->elt_list); + oz_trace2(OZ_TRACE_STREAM, "Stream up: %d %d\n", + st->buf_count, ei->length); + /* Check if we have too much buffered for this stream. If so + * start dropping elements until we are back in bounds. + */ + while ((st->buf_count > st->max_buf_count) && + !list_empty(&st->elt_list)) { + struct oz_elt_info *ei2 = + list_first_entry(&st->elt_list, + struct oz_elt_info, link); + list_del_init(&ei2->link); + list_del_init(&ei2->link_order); + st->buf_count -= ei2->length; + oz_elt_info_free(buf, ei2); + oz_elt_stream_put(st); + } + } + list_add_tail(&ei->link_order, isoc ? + &buf->isoc_list : &buf->order_list); + return 0; +} +/*------------------------------------------------------------------------------ + */ +int oz_select_elts_for_tx(struct oz_elt_buf *buf, u8 isoc, unsigned *len, + unsigned max_len, struct list_head *list) +{ + int count = 0; + struct list_head *e; + struct list_head *el; + struct oz_elt_info *ei; + spin_lock_bh(&buf->lock); + if (isoc) + el = &buf->isoc_list; + else + el = &buf->order_list; + e = el->next; + while (e != el) { + struct oz_app_hdr *app_hdr; + ei = container_of(e, struct oz_elt_info, link_order); + e = e->next; + if ((*len + ei->length) <= max_len) { + app_hdr = (struct oz_app_hdr *) + &ei->data[sizeof(struct oz_elt)]; + app_hdr->elt_seq_num = buf->tx_seq_num[ei->app_id]++; + if (buf->tx_seq_num[ei->app_id] == 0) + buf->tx_seq_num[ei->app_id] = 1; + *len += ei->length; + list_del(&ei->link); + list_del(&ei->link_order); + if (ei->stream) { + ei->stream->buf_count -= ei->length; + oz_trace2(OZ_TRACE_STREAM, + "Stream down: %d %d\n", + ei->stream->buf_count, ei->length); + oz_elt_stream_put(ei->stream); + ei->stream = 0; + } + INIT_LIST_HEAD(&ei->link_order); + list_add_tail(&ei->link, list); + count++; + } else { + break; + } + } + spin_unlock_bh(&buf->lock); + return count; +} +/*------------------------------------------------------------------------------ + */ +int oz_are_elts_available(struct oz_elt_buf *buf) +{ + return buf->order_list.next != &buf->order_list; +} +/*------------------------------------------------------------------------------ + */ +void oz_trim_elt_pool(struct oz_elt_buf *buf) +{ + struct list_head *free = 0; + struct list_head *e; + spin_lock_bh(&buf->lock); + while (buf->free_elts > buf->max_free_elts) { + e = buf->elt_pool; + buf->elt_pool = e->next; + e->next = free; + free = e; + buf->free_elts--; + } + spin_unlock_bh(&buf->lock); + while (free) { + struct oz_elt_info *ei = + container_of(free, struct oz_elt_info, link); + free = free->next; + oz_free(ei); + } +} diff --git a/drivers/staging/ozwpan/ozeltbuf.h b/drivers/staging/ozwpan/ozeltbuf.h new file mode 100644 index 000000000000..03c12f57b9bb --- /dev/null +++ b/drivers/staging/ozwpan/ozeltbuf.h @@ -0,0 +1,70 @@ +/* ----------------------------------------------------------------------------- + * Copyright (c) 2011 Ozmo Inc + * Released under the GNU General Public License Version 2 (GPLv2). + * ----------------------------------------------------------------------------- + */ +#ifndef _OZELTBUF_H +#define _OZELTBUF_H + +#include "ozprotocol.h" + +/*----------------------------------------------------------------------------- + */ +struct oz_pd; +typedef void (*oz_elt_callback_t)(struct oz_pd *pd, long context); + +struct oz_elt_stream { + struct list_head link; + struct list_head elt_list; + atomic_t ref_count; + unsigned buf_count; + unsigned max_buf_count; + u8 frame_number; + u8 id; +}; + +#define OZ_MAX_ELT_PAYLOAD 255 +struct oz_elt_info { + struct list_head link; + struct list_head link_order; + u8 flags; + u8 app_id; + oz_elt_callback_t callback; + long context; + struct oz_elt_stream *stream; + u8 data[sizeof(struct oz_elt) + OZ_MAX_ELT_PAYLOAD]; + int length; + unsigned magic; +}; +/* Flags values */ +#define OZ_EI_F_MARKED 0x1 + +struct oz_elt_buf { + spinlock_t lock; + struct list_head stream_list; + struct list_head order_list; + struct list_head isoc_list; + struct list_head *elt_pool; + int free_elts; + int max_free_elts; + u8 tx_seq_num[OZ_NB_APPS]; +}; + +int oz_elt_buf_init(struct oz_elt_buf *buf); +void oz_elt_buf_term(struct oz_elt_buf *buf); +struct oz_elt_info *oz_elt_info_alloc(struct oz_elt_buf *buf); +void oz_elt_info_free(struct oz_elt_buf *buf, struct oz_elt_info *ei); +void oz_elt_info_free_chain(struct oz_elt_buf *buf, struct list_head *list); +int oz_elt_stream_create(struct oz_elt_buf *buf, u8 id, int max_buf_count); +int oz_elt_stream_delete(struct oz_elt_buf *buf, u8 id); +void oz_elt_stream_get(struct oz_elt_stream *st); +void oz_elt_stream_put(struct oz_elt_stream *st); +int oz_queue_elt_info(struct oz_elt_buf *buf, u8 isoc, u8 id, + struct oz_elt_info *ei); +int oz_select_elts_for_tx(struct oz_elt_buf *buf, u8 isoc, unsigned *len, + unsigned max_len, struct list_head *list); +int oz_are_elts_available(struct oz_elt_buf *buf); +void oz_trim_elt_pool(struct oz_elt_buf *buf); + +#endif /* _OZELTBUF_H */ + diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c new file mode 100644 index 000000000000..8c460f075aec --- /dev/null +++ b/drivers/staging/ozwpan/ozpd.c @@ -0,0 +1,835 @@ +/* ----------------------------------------------------------------------------- + * Copyright (c) 2011 Ozmo Inc + * Released under the GNU General Public License Version 2 (GPLv2). + * ----------------------------------------------------------------------------- + */ +#include +#include +#include +#include +#include +#include +#include "ozconfig.h" +#include "ozprotocol.h" +#include "ozeltbuf.h" +#include "ozpd.h" +#include "ozproto.h" +#include "oztrace.h" +#include "ozalloc.h" +#include "ozevent.h" +#include "ozcdev.h" +#include "ozusbsvc.h" +#include +#include +#include +/*------------------------------------------------------------------------------ + */ +#define OZ_MAX_TX_POOL_SIZE 6 +/* Maximum number of uncompleted isoc frames that can be pending. + */ +#define OZ_MAX_SUBMITTED_ISOC 16 +/*------------------------------------------------------------------------------ + */ +static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd); +static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f); +static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f); +static int oz_send_isoc_frame(struct oz_pd *pd); +static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f); +static void oz_isoc_stream_free(struct oz_isoc_stream *st); +static int oz_send_next_queued_frame(struct oz_pd *pd, int *more_data); +static void oz_isoc_destructor(struct sk_buff *skb); +static int oz_def_app_init(void); +static void oz_def_app_term(void); +static int oz_def_app_start(struct oz_pd *pd, int resume); +static void oz_def_app_stop(struct oz_pd *pd, int pause); +static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt); +/*------------------------------------------------------------------------------ + * Counts the uncompleted isoc frames submitted to netcard. + */ +static atomic_t g_submitted_isoc = ATOMIC_INIT(0); +/* Application handler functions. + */ +static struct oz_app_if g_app_if[OZ_APPID_MAX] = { + {oz_usb_init, + oz_usb_term, + oz_usb_start, + oz_usb_stop, + oz_usb_rx, + oz_usb_heartbeat, + oz_usb_farewell, + OZ_APPID_USB}, + + {oz_def_app_init, + oz_def_app_term, + oz_def_app_start, + oz_def_app_stop, + oz_def_app_rx, + 0, + 0, + OZ_APPID_UNUSED1}, + + {oz_def_app_init, + oz_def_app_term, + oz_def_app_start, + oz_def_app_stop, + oz_def_app_rx, + 0, + 0, + OZ_APPID_UNUSED2}, + + {oz_cdev_init, + oz_cdev_term, + oz_cdev_start, + oz_cdev_stop, + oz_cdev_rx, + 0, + 0, + OZ_APPID_SERIAL}, +}; +/*------------------------------------------------------------------------------ + * Context: process + */ +static int oz_def_app_init(void) +{ + return 0; +} +/*------------------------------------------------------------------------------ + * Context: process + */ +static void oz_def_app_term(void) +{ +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +static int oz_def_app_start(struct oz_pd *pd, int resume) +{ + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +static void oz_def_app_stop(struct oz_pd *pd, int pause) +{ +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt) +{ +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_set_state(struct oz_pd *pd, unsigned state) +{ + pd->state = state; + oz_event_log(OZ_EVT_PD_STATE, 0, 0, 0, state); +#ifdef WANT_TRACE + switch (state) { + case OZ_PD_S_IDLE: + oz_trace("PD State: OZ_PD_S_IDLE\n"); + break; + case OZ_PD_S_CONNECTED: + oz_trace("PD State: OZ_PD_S_CONNECTED\n"); + break; + case OZ_PD_S_STOPPED: + oz_trace("PD State: OZ_PD_S_STOPPED\n"); + break; + case OZ_PD_S_SLEEP: + oz_trace("PD State: OZ_PD_S_SLEEP\n"); + break; + } +#endif /* WANT_TRACE */ +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_get(struct oz_pd *pd) +{ + atomic_inc(&pd->ref_count); +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_put(struct oz_pd *pd) +{ + if (atomic_dec_and_test(&pd->ref_count)) + oz_pd_destroy(pd); +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +struct oz_pd *oz_pd_alloc(u8 *mac_addr) +{ + struct oz_pd *pd = oz_alloc(sizeof(struct oz_pd), GFP_ATOMIC); + if (pd) { + int i; + memset(pd, 0, sizeof(struct oz_pd)); + atomic_set(&pd->ref_count, 2); + for (i = 0; i < OZ_APPID_MAX; i++) + spin_lock_init(&pd->app_lock[i]); + pd->last_rx_pkt_num = 0xffffffff; + oz_pd_set_state(pd, OZ_PD_S_IDLE); + pd->max_tx_size = OZ_MAX_TX_SIZE; + memcpy(pd->mac_addr, mac_addr, ETH_ALEN); + if (0 != oz_elt_buf_init(&pd->elt_buff)) { + oz_free(pd); + pd = 0; + } + spin_lock_init(&pd->tx_frame_lock); + INIT_LIST_HEAD(&pd->tx_queue); + INIT_LIST_HEAD(&pd->farewell_list); + pd->last_sent_frame = &pd->tx_queue; + spin_lock_init(&pd->stream_lock); + INIT_LIST_HEAD(&pd->stream_list); + } + return pd; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_destroy(struct oz_pd *pd) +{ + struct list_head *e; + struct oz_tx_frame *f; + struct oz_isoc_stream *st; + struct oz_farewell *fwell; + oz_trace("Destroying PD\n"); + /* Delete any streams. + */ + e = pd->stream_list.next; + while (e != &pd->stream_list) { + st = container_of(e, struct oz_isoc_stream, link); + e = e->next; + oz_isoc_stream_free(st); + } + /* Free any queued tx frames. + */ + e = pd->tx_queue.next; + while (e != &pd->tx_queue) { + f = container_of(e, struct oz_tx_frame, link); + e = e->next; + oz_retire_frame(pd, f); + } + oz_elt_buf_term(&pd->elt_buff); + /* Free any farewells. + */ + e = pd->farewell_list.next; + while (e != &pd->farewell_list) { + fwell = container_of(e, struct oz_farewell, link); + e = e->next; + oz_free(fwell); + } + /* Deallocate all frames in tx pool. + */ + while (pd->tx_pool) { + e = pd->tx_pool; + pd->tx_pool = e->next; + oz_free(container_of(e, struct oz_tx_frame, link)); + } + if (pd->net_dev) + dev_put(pd->net_dev); + oz_free(pd); +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +int oz_services_start(struct oz_pd *pd, u16 apps, int resume) +{ + struct oz_app_if *ai; + int rc = 0; + oz_trace("oz_services_start(0x%x) resume(%d)\n", apps, resume); + for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { + if (apps & (1<app_id)) { + if (ai->start(pd, resume)) { + rc = -1; + oz_trace("Unabled to start service %d\n", + ai->app_id); + break; + } + oz_polling_lock_bh(); + pd->total_apps |= (1<app_id); + if (resume) + pd->paused_apps &= ~(1<app_id); + oz_polling_unlock_bh(); + } + } + return rc; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_services_stop(struct oz_pd *pd, u16 apps, int pause) +{ + struct oz_app_if *ai; + oz_trace("oz_stop_services(0x%x) pause(%d)\n", apps, pause); + for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { + if (apps & (1<app_id)) { + oz_polling_lock_bh(); + if (pause) { + pd->paused_apps |= (1<app_id); + } else { + pd->total_apps &= ~(1<app_id); + pd->paused_apps &= ~(1<app_id); + } + oz_polling_unlock_bh(); + ai->stop(pd, pause); + } + } +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +void oz_pd_heartbeat(struct oz_pd *pd, u16 apps) +{ + struct oz_app_if *ai; + int more = 0; + for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { + if (ai->heartbeat && (apps & (1<app_id))) { + if (ai->heartbeat(pd)) + more = 1; + } + } + if (more) + oz_pd_request_heartbeat(pd); + if (pd->mode & OZ_F_ISOC_ANYTIME) { + int count = 8; + while (count-- && (oz_send_isoc_frame(pd) >= 0)) + ; + } +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_stop(struct oz_pd *pd) +{ + u16 stop_apps = 0; + oz_trace("oz_pd_stop() State = 0x%x\n", pd->state); + oz_pd_indicate_farewells(pd); + oz_polling_lock_bh(); + stop_apps = pd->total_apps; + pd->total_apps = 0; + pd->paused_apps = 0; + oz_polling_unlock_bh(); + oz_services_stop(pd, stop_apps, 0); + oz_polling_lock_bh(); + oz_pd_set_state(pd, OZ_PD_S_STOPPED); + /* Remove from PD list.*/ + list_del(&pd->link); + oz_polling_unlock_bh(); + oz_trace("pd ref count = %d\n", atomic_read(&pd->ref_count)); + oz_timer_delete(pd, 0); + oz_pd_put(pd); +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +int oz_pd_sleep(struct oz_pd *pd) +{ + int do_stop = 0; + u16 stop_apps = 0; + oz_polling_lock_bh(); + if (pd->state & (OZ_PD_S_SLEEP | OZ_PD_S_STOPPED)) { + oz_polling_unlock_bh(); + return 0; + } + if (pd->keep_alive_j && pd->session_id) { + oz_pd_set_state(pd, OZ_PD_S_SLEEP); + pd->pulse_time_j = jiffies + pd->keep_alive_j; + oz_trace("Sleep Now %lu until %lu\n", + jiffies, pd->pulse_time_j); + } else { + do_stop = 1; + } + stop_apps = pd->total_apps; + oz_polling_unlock_bh(); + if (do_stop) { + oz_pd_stop(pd); + } else { + oz_services_stop(pd, stop_apps, 1); + oz_timer_add(pd, OZ_TIMER_STOP, jiffies + pd->keep_alive_j, 1); + } + return do_stop; +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd) +{ + struct oz_tx_frame *f = 0; + spin_lock_bh(&pd->tx_frame_lock); + if (pd->tx_pool) { + f = container_of(pd->tx_pool, struct oz_tx_frame, link); + pd->tx_pool = pd->tx_pool->next; + pd->tx_pool_count--; + } + spin_unlock_bh(&pd->tx_frame_lock); + if (f == 0) + f = oz_alloc(sizeof(struct oz_tx_frame), GFP_ATOMIC); + if (f) { + f->total_size = sizeof(struct oz_hdr); + INIT_LIST_HEAD(&f->link); + INIT_LIST_HEAD(&f->elt_list); + } + return f; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f) +{ + spin_lock_bh(&pd->tx_frame_lock); + if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) { + f->link.next = pd->tx_pool; + pd->tx_pool = &f->link; + pd->tx_pool_count++; + f = 0; + } else { + oz_free(f); + } + spin_unlock_bh(&pd->tx_frame_lock); + if (f) + oz_free(f); +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +int oz_prepare_frame(struct oz_pd *pd, int empty) +{ + struct oz_tx_frame *f; + if ((pd->mode & OZ_MODE_MASK) != OZ_MODE_TRIGGERED) + return -1; + if (pd->nb_queued_frames >= OZ_MAX_QUEUED_FRAMES) + return -1; + if (!empty && !oz_are_elts_available(&pd->elt_buff)) + return -1; + f = oz_tx_frame_alloc(pd); + if (f == 0) + return -1; + f->hdr.control = + (OZ_PROTOCOL_VERSION<last_tx_pkt_num; + put_unaligned(cpu_to_le32(pd->last_tx_pkt_num), &f->hdr.pkt_num); + if (empty == 0) { + oz_select_elts_for_tx(&pd->elt_buff, 0, &f->total_size, + pd->max_tx_size, &f->elt_list); + } + spin_lock(&pd->tx_frame_lock); + list_add_tail(&f->link, &pd->tx_queue); + pd->nb_queued_frames++; + spin_unlock(&pd->tx_frame_lock); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f) +{ + struct sk_buff *skb = 0; + struct net_device *dev = pd->net_dev; + struct oz_hdr *oz_hdr; + struct oz_elt *elt; + struct list_head *e; + /* Allocate skb with enough space for the lower layers as well + * as the space we need. + */ + skb = alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC); + if (skb == 0) + return 0; + /* Reserve the head room for lower layers. + */ + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + skb_reset_network_header(skb); + skb->dev = dev; + skb->protocol = htons(OZ_ETHERTYPE); + if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, + dev->dev_addr, skb->len) < 0) + goto fail; + /* Push the tail to the end of the area we are going to copy to. + */ + oz_hdr = (struct oz_hdr *)skb_put(skb, f->total_size); + f->hdr.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; + memcpy(oz_hdr, &f->hdr, sizeof(struct oz_hdr)); + /* Copy the elements into the frame body. + */ + elt = (struct oz_elt *)(oz_hdr+1); + for (e = f->elt_list.next; e != &f->elt_list; e = e->next) { + struct oz_elt_info *ei; + ei = container_of(e, struct oz_elt_info, link); + memcpy(elt, ei->data, ei->length); + elt = oz_next_elt(elt); + } + return skb; +fail: + kfree_skb(skb); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f) +{ + struct list_head *e; + struct oz_elt_info *ei; + e = f->elt_list.next; + while (e != &f->elt_list) { + ei = container_of(e, struct oz_elt_info, link); + e = e->next; + list_del_init(&ei->link); + if (ei->callback) + ei->callback(pd, ei->context); + spin_lock_bh(&pd->elt_buff.lock); + oz_elt_info_free(&pd->elt_buff, ei); + spin_unlock_bh(&pd->elt_buff.lock); + } + oz_tx_frame_free(pd, f); + if (pd->elt_buff.free_elts > pd->elt_buff.max_free_elts) + oz_trim_elt_pool(&pd->elt_buff); +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +static int oz_send_next_queued_frame(struct oz_pd *pd, int *more_data) +{ + struct sk_buff *skb; + struct oz_tx_frame *f; + struct list_head *e; + *more_data = 0; + spin_lock(&pd->tx_frame_lock); + e = pd->last_sent_frame->next; + if (e == &pd->tx_queue) { + spin_unlock(&pd->tx_frame_lock); + return -1; + } + pd->last_sent_frame = e; + if (e->next != &pd->tx_queue) + *more_data = 1; + f = container_of(e, struct oz_tx_frame, link); + skb = oz_build_frame(pd, f); + spin_unlock(&pd->tx_frame_lock); + oz_trace2(OZ_TRACE_TX_FRAMES, "TX frame PN=0x%x\n", f->hdr.pkt_num); + if (skb) { + oz_event_log(OZ_EVT_TX_FRAME, + 0, + (((u16)f->hdr.control)<<8)|f->hdr.last_pkt_num, + 0, f->hdr.pkt_num); + if (dev_queue_xmit(skb) < 0) + return -1; + } + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +void oz_send_queued_frames(struct oz_pd *pd, int backlog) +{ + int more; + if (backlog < OZ_MAX_QUEUED_FRAMES) { + if (oz_send_next_queued_frame(pd, &more) >= 0) { + while (more && oz_send_next_queued_frame(pd, &more)) + ; + } else { + if (((pd->mode & OZ_F_ISOC_ANYTIME) == 0) + || (pd->isoc_sent == 0)) { + if (oz_prepare_frame(pd, 1) >= 0) + oz_send_next_queued_frame(pd, &more); + } + } + } else { + oz_send_next_queued_frame(pd, &more); + } +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +static int oz_send_isoc_frame(struct oz_pd *pd) +{ + struct sk_buff *skb = 0; + struct net_device *dev = pd->net_dev; + struct oz_hdr *oz_hdr; + struct oz_elt *elt; + struct list_head *e; + struct list_head list; + int total_size = sizeof(struct oz_hdr); + INIT_LIST_HEAD(&list); + + oz_select_elts_for_tx(&pd->elt_buff, 1, &total_size, + pd->max_tx_size, &list); + if (list.next == &list) + return 0; + skb = alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC); + if (skb == 0) { + oz_trace("Cannot alloc skb\n"); + oz_elt_info_free_chain(&pd->elt_buff, &list); + return -1; + } + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + skb_reset_network_header(skb); + skb->dev = dev; + skb->protocol = htons(OZ_ETHERTYPE); + if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, + dev->dev_addr, skb->len) < 0) { + kfree_skb(skb); + return -1; + } + oz_hdr = (struct oz_hdr *)skb_put(skb, total_size); + oz_hdr->control = (OZ_PROTOCOL_VERSION<last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; + elt = (struct oz_elt *)(oz_hdr+1); + + for (e = list.next; e != &list; e = e->next) { + struct oz_elt_info *ei; + ei = container_of(e, struct oz_elt_info, link); + memcpy(elt, ei->data, ei->length); + elt = oz_next_elt(elt); + } + oz_event_log(OZ_EVT_TX_ISOC, 0, 0, 0, 0); + dev_queue_xmit(skb); + oz_elt_info_free_chain(&pd->elt_buff, &list); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +void oz_retire_tx_frames(struct oz_pd *pd, u8 lpn) +{ + struct list_head *e; + struct oz_tx_frame *f; + struct list_head *first = 0; + struct list_head *last = 0; + u8 diff; + u32 pkt_num; + + spin_lock(&pd->tx_frame_lock); + e = pd->tx_queue.next; + while (e != &pd->tx_queue) { + f = container_of(e, struct oz_tx_frame, link); + pkt_num = le32_to_cpu(get_unaligned(&f->hdr.pkt_num)); + diff = (lpn - (pkt_num & OZ_LAST_PN_MASK)) & OZ_LAST_PN_MASK; + if (diff > OZ_LAST_PN_HALF_CYCLE) + break; + if (first == 0) + first = e; + last = e; + e = e->next; + pd->nb_queued_frames--; + } + if (first) { + last->next->prev = &pd->tx_queue; + pd->tx_queue.next = last->next; + last->next = 0; + } + pd->last_sent_frame = &pd->tx_queue; + spin_unlock(&pd->tx_frame_lock); + while (first) { + f = container_of(first, struct oz_tx_frame, link); + first = first->next; + oz_retire_frame(pd, f); + } +} +/*------------------------------------------------------------------------------ + * Precondition: stream_lock must be held. + * Context: softirq + */ +static struct oz_isoc_stream *pd_stream_find(struct oz_pd *pd, u8 ep_num) +{ + struct list_head *e; + struct oz_isoc_stream *st; + list_for_each(e, &pd->stream_list) { + st = container_of(e, struct oz_isoc_stream, link); + if (st->ep_num == ep_num) + return st; + } + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num) +{ + struct oz_isoc_stream *st = + oz_alloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC); + if (!st) + return -1; + memset(st, 0, sizeof(struct oz_isoc_stream)); + st->ep_num = ep_num; + spin_lock_bh(&pd->stream_lock); + if (!pd_stream_find(pd, ep_num)) { + list_add(&st->link, &pd->stream_list); + st = 0; + } + spin_unlock_bh(&pd->stream_lock); + if (st) + oz_free(st); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +static void oz_isoc_stream_free(struct oz_isoc_stream *st) +{ + if (st->skb) + kfree_skb(st->skb); + oz_free(st); +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +int oz_isoc_stream_delete(struct oz_pd *pd, u8 ep_num) +{ + struct oz_isoc_stream *st; + spin_lock_bh(&pd->stream_lock); + st = pd_stream_find(pd, ep_num); + if (st) + list_del(&st->link); + spin_unlock_bh(&pd->stream_lock); + if (st) + oz_isoc_stream_free(st); + return 0; +} +/*------------------------------------------------------------------------------ + * Context: any + */ +static void oz_isoc_destructor(struct sk_buff *skb) +{ + atomic_dec(&g_submitted_isoc); + oz_event_log(OZ_EVT_TX_ISOC_DONE, atomic_read(&g_submitted_isoc), + 0, skb, 0); +} +/*------------------------------------------------------------------------------ + * Context: softirq + */ +int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, u8 *data, int len) +{ + struct net_device *dev = pd->net_dev; + struct oz_isoc_stream *st; + u8 nb_units = 0; + struct sk_buff *skb = 0; + struct oz_hdr *oz_hdr = 0; + int size = 0; + spin_lock_bh(&pd->stream_lock); + st = pd_stream_find(pd, ep_num); + if (st) { + skb = st->skb; + st->skb = 0; + nb_units = st->nb_units; + st->nb_units = 0; + oz_hdr = st->oz_hdr; + size = st->size; + } + spin_unlock_bh(&pd->stream_lock); + if (!st) + return 0; + if (!skb) { + /* Allocate enough space for max size frame. */ + skb = alloc_skb(pd->max_tx_size + OZ_ALLOCATED_SPACE(dev), + GFP_ATOMIC); + if (skb == 0) + return 0; + /* Reserve the head room for lower layers. */ + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + skb_reset_network_header(skb); + skb->dev = dev; + skb->protocol = htons(OZ_ETHERTYPE); + size = sizeof(struct oz_hdr) + sizeof(struct oz_isoc_large); + oz_hdr = (struct oz_hdr *)skb_put(skb, size); + } + memcpy(skb_put(skb, len), data, len); + size += len; + if (++nb_units < pd->ms_per_isoc) { + spin_lock_bh(&pd->stream_lock); + st->skb = skb; + st->nb_units = nb_units; + st->oz_hdr = oz_hdr; + st->size = size; + spin_unlock_bh(&pd->stream_lock); + } else { + struct oz_hdr oz; + struct oz_isoc_large iso; + spin_lock_bh(&pd->stream_lock); + iso.frame_number = st->frame_num; + st->frame_num += nb_units; + spin_unlock_bh(&pd->stream_lock); + oz.control = + (OZ_PROTOCOL_VERSION<trigger_pkt_num & OZ_LAST_PN_MASK; + oz.pkt_num = 0; + iso.endpoint = ep_num; + iso.format = OZ_DATA_F_ISOC_LARGE; + iso.ms_data = nb_units; + memcpy(oz_hdr, &oz, sizeof(oz)); + memcpy(oz_hdr+1, &iso, sizeof(iso)); + if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, + dev->dev_addr, skb->len) < 0) { + kfree_skb(skb); + return -1; + } + if (atomic_read(&g_submitted_isoc) < OZ_MAX_SUBMITTED_ISOC) { + skb->destructor = oz_isoc_destructor; + atomic_inc(&g_submitted_isoc); + oz_event_log(OZ_EVT_TX_ISOC, nb_units, iso.frame_number, + skb, atomic_read(&g_submitted_isoc)); + if (dev_queue_xmit(skb) < 0) + return -1; + } else { + oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, 0, 0); + kfree_skb(skb); + } + } + return 0; +} +/*------------------------------------------------------------------------------ + * Context: process + */ +void oz_apps_init(void) +{ + int i; + for (i = 0; i < OZ_APPID_MAX; i++) + if (g_app_if[i].init) + g_app_if[i].init(); +} +/*------------------------------------------------------------------------------ + * Context: process + */ +void oz_apps_term(void) +{ + int i; + /* Terminate all the apps. */ + for (i = 0; i < OZ_APPID_MAX; i++) + if (g_app_if[i].term) + g_app_if[i].term(); +} +/*------------------------------------------------------------------------------ + * Context: softirq-serialized + */ +void oz_handle_app_elt(struct oz_pd *pd, u8 app_id, struct oz_elt *elt) +{ + struct oz_app_if *ai; + if (app_id > OZ_APPID_MAX) + return; + ai = &g_app_if[app_id-1]; + ai->rx(pd, elt); +} +/*------------------------------------------------------------------------------ + * Context: softirq or process + */ +void oz_pd_indicate_farewells(struct oz_pd *pd) +{ + struct oz_farewell *f; + struct oz_app_if *ai = &g_app_if[OZ_APPID_USB-1]; + while (1) { + oz_polling_lock_bh(); + if (list_empty(&pd->farewell_list)) { + oz_polling_unlock_bh(); + break; + } + f = list_first_entry(&pd->farewell_list, + struct oz_farewell, link); + list_del(&f->link); + oz_polling_unlock_bh(); + if (ai->farewell) + ai->farewell(pd, f->ep_num, f->report, f->len); + oz_free(f); + } +} diff --git a/drivers/staging/ozwpan/ozpd.h b/drivers/staging/ozwpan/ozpd.h new file mode 100644 index 000000000000..afc77f0260f0 --- /dev/null +++ b/drivers/staging/ozwpan/ozpd.h @@ -0,0 +1,121 @@ +/* ----------------------------------------------------------------------------- + * Copyright (c) 2011 Ozmo Inc + * Released under the GNU General Public License Version 2 (GPLv2). + * ----------------------------------------------------------------------------- + */ +#ifndef _OZPD_H_ +#define _OZPD_H_ + +#include "ozeltbuf.h" + +/* PD state + */ +#define OZ_PD_S_IDLE 0x1 +#define OZ_PD_S_CONNECTED 0x2 +#define OZ_PD_S_SLEEP 0x4 +#define OZ_PD_S_STOPPED 0x8 + +/* Timer event types. + */ +#define OZ_TIMER_TOUT 1 +#define OZ_TIMER_HEARTBEAT 2 +#define OZ_TIMER_STOP 3 + +/* Data structure that hold information on a frame for transmisson. This is + * built when the frame is first transmitted and is used to rebuild the frame + * if a re-transmission is required. + */ +struct oz_tx_frame { + struct list_head link; + struct list_head elt_list; + struct oz_hdr hdr; + int total_size; +}; + +struct oz_isoc_stream { + struct list_head link; + u8 ep_num; + u8 frame_num; + u8 nb_units; + int size; + struct sk_buff *skb; + struct oz_hdr *oz_hdr; +}; + +struct oz_farewell { + struct list_head link; + u8 ep_num; + u8 index; + u8 report[1]; + u8 len; +}; + +/* Data structure that holds information on a specific peripheral device (PD). + */ +struct oz_pd { + struct list_head link; + atomic_t ref_count; + u8 mac_addr[ETH_ALEN]; + unsigned state; + unsigned state_flags; + unsigned send_flags; + u16 total_apps; + u16 paused_apps; + u8 session_id; + u8 param_rsp_status; + u8 pd_info; + u8 isoc_sent; + u32 last_rx_pkt_num; + u32 last_tx_pkt_num; + u32 trigger_pkt_num; + unsigned long pulse_time_j; + unsigned long timeout_time_j; + unsigned long pulse_period_j; + unsigned long presleep_j; + unsigned long keep_alive_j; + unsigned long last_rx_time_j; + struct oz_elt_buf elt_buff; + void *app_ctx[OZ_APPID_MAX]; + spinlock_t app_lock[OZ_APPID_MAX]; + int max_tx_size; + u8 heartbeat_requested; + u8 mode; + u8 ms_per_isoc; + unsigned max_stream_buffering; + int nb_queued_frames; + struct list_head *tx_pool; + int tx_pool_count; + spinlock_t tx_frame_lock; + struct list_head *last_sent_frame; + struct list_head tx_queue; + struct list_head farewell_list; + spinlock_t stream_lock; + struct list_head stream_list; + struct net_device *net_dev; +}; + +#define OZ_MAX_QUEUED_FRAMES 4 + +struct oz_pd *oz_pd_alloc(u8 *mac_addr); +void oz_pd_destroy(struct oz_pd *pd); +void oz_pd_get(struct oz_pd *pd); +void oz_pd_put(struct oz_pd *pd); +void oz_pd_set_state(struct oz_pd *pd, unsigned state); +void oz_pd_indicate_farewells(struct oz_pd *pd); +int oz_pd_sleep(struct oz_pd *pd); +void oz_pd_stop(struct oz_pd *pd); +void oz_pd_heartbeat(struct oz_pd *pd, u16 apps); +int oz_services_start(struct oz_pd *pd, u16 apps, int resume); +void oz_services_stop(struct oz_pd *pd, u16 apps, int pause); +int oz_prepare_frame(struct oz_pd *pd, int empty); +void oz_send_queued_frames(struct oz_pd *pd, int backlog); +void oz_retire_tx_frames(struct oz_pd *pd, u8 lpn); +int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num); +int oz_isoc_stream_delete(struct oz_pd *pd, u8 ep_num); +int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, u8 *data, int len); +void oz_handle_app_elt(struct oz_pd *pd, u8 app_id, struct oz_elt *elt); +void oz_apps_init(void); +void oz_apps_term(void); + +#endif /* Sentry */ + -- 2.20.1