--- /dev/null
+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#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);
+ }
+}
--- /dev/null
+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/netdevice.h>
+#include <linux/errno.h>
+#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 <asm/unaligned.h>
+#include <linux/uaccess.h>
+#include <net/psnap.h>
+/*------------------------------------------------------------------------------
+ */
+#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<<ai->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<<ai->app_id);
+ if (resume)
+ pd->paused_apps &= ~(1<<ai->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<<ai->app_id)) {
+ oz_polling_lock_bh();
+ if (pause) {
+ pd->paused_apps |= (1<<ai->app_id);
+ } else {
+ pd->total_apps &= ~(1<<ai->app_id);
+ pd->paused_apps &= ~(1<<ai->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<<ai->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<<OZ_VERSION_SHIFT) | OZ_F_ACK_REQUESTED;
+ ++pd->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<<OZ_VERSION_SHIFT) | OZ_F_ISOC;
+ oz_hdr->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<<OZ_VERSION_SHIFT) | OZ_F_ISOC;
+ oz.last_pkt_num = pd->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);
+ }
+}
projects / mirror_ubuntu-eoan-kernel.git / commitdiff