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![Quentin Lambert](/assets/img/avatar_default.png)
The original version was success handling rather than error handling, therefore this patch reduces nesting. Signed-off-by: Quentin Lambert <lambert.quentin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
886 lines
20 KiB
C
886 lines
20 KiB
C
/* -----------------------------------------------------------------------------
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* Copyright (c) 2011 Ozmo Inc
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* Released under the GNU General Public License Version 2 (GPLv2).
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* -----------------------------------------------------------------------------
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*/
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/sched.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/errno.h>
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#include "ozdbg.h"
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#include "ozprotocol.h"
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#include "ozeltbuf.h"
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#include "ozpd.h"
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#include "ozproto.h"
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#include "ozcdev.h"
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#include "ozusbsvc.h"
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#include <asm/unaligned.h>
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#include <linux/uaccess.h>
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#include <net/psnap.h>
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static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd);
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static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f);
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static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f);
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static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f);
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static int oz_send_isoc_frame(struct oz_pd *pd);
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static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f);
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static void oz_isoc_stream_free(struct oz_isoc_stream *st);
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static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data);
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static void oz_isoc_destructor(struct sk_buff *skb);
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/*
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* Counts the uncompleted isoc frames submitted to netcard.
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*/
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static atomic_t g_submitted_isoc = ATOMIC_INIT(0);
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/* Application handler functions.
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*/
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static const struct oz_app_if g_app_if[OZ_NB_APPS] = {
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[OZ_APPID_USB] = {
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.init = oz_usb_init,
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.term = oz_usb_term,
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.start = oz_usb_start,
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.stop = oz_usb_stop,
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.rx = oz_usb_rx,
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.heartbeat = oz_usb_heartbeat,
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.farewell = oz_usb_farewell,
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},
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[OZ_APPID_SERIAL] = {
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.init = oz_cdev_init,
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.term = oz_cdev_term,
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.start = oz_cdev_start,
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.stop = oz_cdev_stop,
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.rx = oz_cdev_rx,
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},
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};
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/*
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* Context: softirq or process
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*/
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void oz_pd_set_state(struct oz_pd *pd, unsigned state)
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{
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pd->state = state;
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switch (state) {
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case OZ_PD_S_IDLE:
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oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_IDLE\n");
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break;
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case OZ_PD_S_CONNECTED:
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oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_CONNECTED\n");
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break;
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case OZ_PD_S_STOPPED:
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oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_STOPPED\n");
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break;
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case OZ_PD_S_SLEEP:
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oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_SLEEP\n");
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break;
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}
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}
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/*
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* Context: softirq or process
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*/
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void oz_pd_get(struct oz_pd *pd)
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{
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atomic_inc(&pd->ref_count);
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}
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/*
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* Context: softirq or process
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*/
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void oz_pd_put(struct oz_pd *pd)
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{
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if (atomic_dec_and_test(&pd->ref_count))
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oz_pd_destroy(pd);
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}
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/*
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* Context: softirq-serialized
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*/
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struct oz_pd *oz_pd_alloc(const u8 *mac_addr)
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{
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struct oz_pd *pd;
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int i;
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pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC);
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if (!pd)
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return NULL;
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atomic_set(&pd->ref_count, 2);
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for (i = 0; i < OZ_NB_APPS; i++)
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spin_lock_init(&pd->app_lock[i]);
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pd->last_rx_pkt_num = 0xffffffff;
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oz_pd_set_state(pd, OZ_PD_S_IDLE);
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pd->max_tx_size = OZ_MAX_TX_SIZE;
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ether_addr_copy(pd->mac_addr, mac_addr);
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oz_elt_buf_init(&pd->elt_buff);
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spin_lock_init(&pd->tx_frame_lock);
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INIT_LIST_HEAD(&pd->tx_queue);
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INIT_LIST_HEAD(&pd->farewell_list);
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pd->last_sent_frame = &pd->tx_queue;
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spin_lock_init(&pd->stream_lock);
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INIT_LIST_HEAD(&pd->stream_list);
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tasklet_init(&pd->heartbeat_tasklet, oz_pd_heartbeat_handler,
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(unsigned long)pd);
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tasklet_init(&pd->timeout_tasklet, oz_pd_timeout_handler,
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(unsigned long)pd);
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hrtimer_init(&pd->heartbeat, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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hrtimer_init(&pd->timeout, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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pd->heartbeat.function = oz_pd_heartbeat_event;
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pd->timeout.function = oz_pd_timeout_event;
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return pd;
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}
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/*
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* Context: softirq or process
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*/
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static void oz_pd_free(struct work_struct *work)
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{
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struct list_head *e, *n;
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struct oz_pd *pd;
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oz_pd_dbg(pd, ON, "Destroying PD\n");
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pd = container_of(work, struct oz_pd, workitem);
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/*Disable timer tasklets*/
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tasklet_kill(&pd->heartbeat_tasklet);
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tasklet_kill(&pd->timeout_tasklet);
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/* Free streams, queued tx frames and farewells. */
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list_for_each_safe(e, n, &pd->stream_list)
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oz_isoc_stream_free(list_entry(e, struct oz_isoc_stream, link));
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list_for_each_safe(e, n, &pd->tx_queue) {
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struct oz_tx_frame *f = list_entry(e, struct oz_tx_frame, link);
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if (f->skb != NULL)
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kfree_skb(f->skb);
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oz_retire_frame(pd, f);
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}
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oz_elt_buf_term(&pd->elt_buff);
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list_for_each_safe(e, n, &pd->farewell_list)
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kfree(list_entry(e, struct oz_farewell, link));
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if (pd->net_dev)
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dev_put(pd->net_dev);
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kfree(pd);
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}
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/*
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* Context: softirq or Process
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*/
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void oz_pd_destroy(struct oz_pd *pd)
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{
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if (hrtimer_active(&pd->timeout))
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hrtimer_cancel(&pd->timeout);
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if (hrtimer_active(&pd->heartbeat))
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hrtimer_cancel(&pd->heartbeat);
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INIT_WORK(&pd->workitem, oz_pd_free);
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if (!schedule_work(&pd->workitem))
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oz_pd_dbg(pd, ON, "failed to schedule workitem\n");
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}
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/*
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* Context: softirq-serialized
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*/
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int oz_services_start(struct oz_pd *pd, u16 apps, int resume)
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{
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int i, rc = 0;
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oz_pd_dbg(pd, ON, "%s: (0x%x) resume(%d)\n", __func__, apps, resume);
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for (i = 0; i < OZ_NB_APPS; i++) {
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if (g_app_if[i].start && (apps & (1 << i))) {
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if (g_app_if[i].start(pd, resume)) {
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rc = -1;
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oz_pd_dbg(pd, ON,
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"Unable to start service %d\n", i);
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break;
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}
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spin_lock_bh(&g_polling_lock);
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pd->total_apps |= (1 << i);
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if (resume)
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pd->paused_apps &= ~(1 << i);
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spin_unlock_bh(&g_polling_lock);
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}
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}
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return rc;
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}
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/*
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* Context: softirq or process
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*/
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void oz_services_stop(struct oz_pd *pd, u16 apps, int pause)
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{
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int i;
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oz_pd_dbg(pd, ON, "%s: (0x%x) pause(%d)\n", __func__, apps, pause);
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for (i = 0; i < OZ_NB_APPS; i++) {
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if (g_app_if[i].stop && (apps & (1 << i))) {
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spin_lock_bh(&g_polling_lock);
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if (pause) {
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pd->paused_apps |= (1 << i);
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} else {
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pd->total_apps &= ~(1 << i);
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pd->paused_apps &= ~(1 << i);
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}
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spin_unlock_bh(&g_polling_lock);
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g_app_if[i].stop(pd, pause);
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}
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}
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}
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/*
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* Context: softirq
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*/
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void oz_pd_heartbeat(struct oz_pd *pd, u16 apps)
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{
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int i, more = 0;
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for (i = 0; i < OZ_NB_APPS; i++) {
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if (g_app_if[i].heartbeat && (apps & (1 << i))) {
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if (g_app_if[i].heartbeat(pd))
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more = 1;
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}
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}
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if ((!more) && (hrtimer_active(&pd->heartbeat)))
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hrtimer_cancel(&pd->heartbeat);
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if (pd->mode & OZ_F_ISOC_ANYTIME) {
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int count = 8;
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while (count-- && (oz_send_isoc_frame(pd) >= 0))
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;
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}
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}
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/*
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* Context: softirq or process
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*/
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void oz_pd_stop(struct oz_pd *pd)
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{
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u16 stop_apps;
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oz_dbg(ON, "oz_pd_stop() State = 0x%x\n", pd->state);
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oz_pd_indicate_farewells(pd);
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spin_lock_bh(&g_polling_lock);
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stop_apps = pd->total_apps;
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pd->total_apps = 0;
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pd->paused_apps = 0;
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spin_unlock_bh(&g_polling_lock);
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oz_services_stop(pd, stop_apps, 0);
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spin_lock_bh(&g_polling_lock);
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oz_pd_set_state(pd, OZ_PD_S_STOPPED);
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/* Remove from PD list.*/
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list_del(&pd->link);
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spin_unlock_bh(&g_polling_lock);
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oz_dbg(ON, "pd ref count = %d\n", atomic_read(&pd->ref_count));
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oz_pd_put(pd);
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}
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/*
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* Context: softirq
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*/
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int oz_pd_sleep(struct oz_pd *pd)
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{
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int do_stop = 0;
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u16 stop_apps;
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spin_lock_bh(&g_polling_lock);
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if (pd->state & (OZ_PD_S_SLEEP | OZ_PD_S_STOPPED)) {
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spin_unlock_bh(&g_polling_lock);
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return 0;
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}
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if (pd->keep_alive && pd->session_id)
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oz_pd_set_state(pd, OZ_PD_S_SLEEP);
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else
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do_stop = 1;
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stop_apps = pd->total_apps;
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spin_unlock_bh(&g_polling_lock);
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if (do_stop) {
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oz_pd_stop(pd);
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} else {
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oz_services_stop(pd, stop_apps, 1);
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oz_timer_add(pd, OZ_TIMER_STOP, pd->keep_alive);
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}
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return do_stop;
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}
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/*
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* Context: softirq
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*/
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static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd)
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{
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struct oz_tx_frame *f;
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f = kmem_cache_alloc(oz_tx_frame_cache, GFP_ATOMIC);
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if (f) {
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f->total_size = sizeof(struct oz_hdr);
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INIT_LIST_HEAD(&f->link);
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INIT_LIST_HEAD(&f->elt_list);
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}
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return f;
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}
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/*
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* Context: softirq or process
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*/
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static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f)
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{
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pd->nb_queued_isoc_frames--;
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list_del_init(&f->link);
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kmem_cache_free(oz_tx_frame_cache, f);
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oz_dbg(TX_FRAMES, "Releasing ISOC Frame isoc_nb= %d\n",
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pd->nb_queued_isoc_frames);
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}
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/*
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* Context: softirq or process
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*/
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static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f)
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{
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kmem_cache_free(oz_tx_frame_cache, f);
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}
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/*
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* Context: softirq-serialized
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*/
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static void oz_set_more_bit(struct sk_buff *skb)
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{
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struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
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oz_hdr->control |= OZ_F_MORE_DATA;
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}
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/*
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* Context: softirq-serialized
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*/
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static void oz_set_last_pkt_nb(struct oz_pd *pd, struct sk_buff *skb)
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{
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struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
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oz_hdr->last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
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}
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/*
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* Context: softirq
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*/
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int oz_prepare_frame(struct oz_pd *pd, int empty)
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{
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struct oz_tx_frame *f;
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if ((pd->mode & OZ_MODE_MASK) != OZ_MODE_TRIGGERED)
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return -1;
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if (pd->nb_queued_frames >= OZ_MAX_QUEUED_FRAMES)
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return -1;
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if (!empty && !oz_are_elts_available(&pd->elt_buff))
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return -1;
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f = oz_tx_frame_alloc(pd);
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if (f == NULL)
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return -1;
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f->skb = NULL;
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f->hdr.control =
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(OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ACK_REQUESTED;
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++pd->last_tx_pkt_num;
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put_unaligned(cpu_to_le32(pd->last_tx_pkt_num), &f->hdr.pkt_num);
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if (empty == 0) {
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oz_select_elts_for_tx(&pd->elt_buff, 0, &f->total_size,
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pd->max_tx_size, &f->elt_list);
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}
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spin_lock(&pd->tx_frame_lock);
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list_add_tail(&f->link, &pd->tx_queue);
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pd->nb_queued_frames++;
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spin_unlock(&pd->tx_frame_lock);
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return 0;
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}
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/*
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* Context: softirq-serialized
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*/
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static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f)
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{
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struct sk_buff *skb;
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struct net_device *dev = pd->net_dev;
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struct oz_hdr *oz_hdr;
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struct oz_elt *elt;
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struct oz_elt_info *ei;
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/* Allocate skb with enough space for the lower layers as well
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* as the space we need.
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*/
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skb = alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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/* Reserve the head room for lower layers.
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*/
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reset_network_header(skb);
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skb->dev = dev;
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skb->protocol = htons(OZ_ETHERTYPE);
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if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
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dev->dev_addr, skb->len) < 0)
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goto fail;
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/* Push the tail to the end of the area we are going to copy to.
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*/
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oz_hdr = (struct oz_hdr *)skb_put(skb, f->total_size);
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f->hdr.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
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memcpy(oz_hdr, &f->hdr, sizeof(struct oz_hdr));
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/* Copy the elements into the frame body.
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*/
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elt = (struct oz_elt *)(oz_hdr+1);
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list_for_each_entry(ei, &f->elt_list, link) {
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memcpy(elt, ei->data, ei->length);
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elt = oz_next_elt(elt);
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}
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return skb;
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fail:
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kfree_skb(skb);
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return NULL;
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}
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/*
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* Context: softirq or process
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*/
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static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f)
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{
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struct oz_elt_info *ei, *n;
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list_for_each_entry_safe(ei, n, &f->elt_list, link) {
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list_del_init(&ei->link);
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if (ei->callback)
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ei->callback(pd, ei->context);
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spin_lock_bh(&pd->elt_buff.lock);
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oz_elt_info_free(&pd->elt_buff, ei);
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spin_unlock_bh(&pd->elt_buff.lock);
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}
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oz_tx_frame_free(pd, f);
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}
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/*
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* Context: softirq-serialized
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*/
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static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data)
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{
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struct sk_buff *skb;
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struct oz_tx_frame *f;
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struct list_head *e;
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spin_lock(&pd->tx_frame_lock);
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e = pd->last_sent_frame->next;
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if (e == &pd->tx_queue) {
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spin_unlock(&pd->tx_frame_lock);
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return -1;
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}
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f = list_entry(e, struct oz_tx_frame, link);
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if (f->skb != NULL) {
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skb = f->skb;
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oz_tx_isoc_free(pd, f);
|
|
spin_unlock(&pd->tx_frame_lock);
|
|
if (more_data)
|
|
oz_set_more_bit(skb);
|
|
oz_set_last_pkt_nb(pd, skb);
|
|
if ((int)atomic_read(&g_submitted_isoc) <
|
|
OZ_MAX_SUBMITTED_ISOC) {
|
|
if (dev_queue_xmit(skb) < 0) {
|
|
oz_dbg(TX_FRAMES, "Dropping ISOC Frame\n");
|
|
return -1;
|
|
}
|
|
atomic_inc(&g_submitted_isoc);
|
|
oz_dbg(TX_FRAMES, "Sending ISOC Frame, nb_isoc= %d\n",
|
|
pd->nb_queued_isoc_frames);
|
|
return 0;
|
|
}
|
|
kfree_skb(skb);
|
|
oz_dbg(TX_FRAMES, "Dropping ISOC Frame>\n");
|
|
return -1;
|
|
}
|
|
|
|
pd->last_sent_frame = e;
|
|
skb = oz_build_frame(pd, f);
|
|
spin_unlock(&pd->tx_frame_lock);
|
|
if (!skb)
|
|
return -1;
|
|
if (more_data)
|
|
oz_set_more_bit(skb);
|
|
oz_dbg(TX_FRAMES, "TX frame PN=0x%x\n", 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)
|
|
{
|
|
while (oz_prepare_frame(pd, 0) >= 0)
|
|
backlog++;
|
|
|
|
switch (pd->mode & (OZ_F_ISOC_NO_ELTS | OZ_F_ISOC_ANYTIME)) {
|
|
|
|
case OZ_F_ISOC_NO_ELTS: {
|
|
backlog += pd->nb_queued_isoc_frames;
|
|
if (backlog <= 0)
|
|
goto out;
|
|
if (backlog > OZ_MAX_SUBMITTED_ISOC)
|
|
backlog = OZ_MAX_SUBMITTED_ISOC;
|
|
break;
|
|
}
|
|
case OZ_NO_ELTS_ANYTIME: {
|
|
if ((backlog <= 0) && (pd->isoc_sent == 0))
|
|
goto out;
|
|
break;
|
|
}
|
|
default: {
|
|
if (backlog <= 0)
|
|
goto out;
|
|
break;
|
|
}
|
|
}
|
|
while (backlog--) {
|
|
if (oz_send_next_queued_frame(pd, backlog) < 0)
|
|
break;
|
|
}
|
|
return;
|
|
|
|
out: oz_prepare_frame(pd, 1);
|
|
oz_send_next_queued_frame(pd, 0);
|
|
}
|
|
|
|
/*
|
|
* Context: softirq
|
|
*/
|
|
static int oz_send_isoc_frame(struct oz_pd *pd)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct net_device *dev = pd->net_dev;
|
|
struct oz_hdr *oz_hdr;
|
|
struct oz_elt *elt;
|
|
struct oz_elt_info *ei;
|
|
LIST_HEAD(list);
|
|
int total_size = sizeof(struct oz_hdr);
|
|
|
|
oz_select_elts_for_tx(&pd->elt_buff, 1, &total_size,
|
|
pd->max_tx_size, &list);
|
|
if (list_empty(&list))
|
|
return 0;
|
|
skb = alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
|
|
if (skb == NULL) {
|
|
oz_dbg(ON, "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);
|
|
|
|
list_for_each_entry(ei, &list, link) {
|
|
memcpy(elt, ei->data, ei->length);
|
|
elt = oz_next_elt(elt);
|
|
}
|
|
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 oz_tx_frame *f, *tmp = NULL;
|
|
u8 diff;
|
|
u32 pkt_num;
|
|
|
|
LIST_HEAD(list);
|
|
|
|
spin_lock(&pd->tx_frame_lock);
|
|
list_for_each_entry(f, &pd->tx_queue, 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) || (pkt_num == 0))
|
|
break;
|
|
oz_dbg(TX_FRAMES, "Releasing pkt_num= %u, nb= %d\n",
|
|
pkt_num, pd->nb_queued_frames);
|
|
tmp = f;
|
|
pd->nb_queued_frames--;
|
|
}
|
|
if (tmp)
|
|
list_cut_position(&list, &pd->tx_queue, &tmp->link);
|
|
pd->last_sent_frame = &pd->tx_queue;
|
|
spin_unlock(&pd->tx_frame_lock);
|
|
|
|
list_for_each_entry_safe(f, tmp, &list, link)
|
|
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 oz_isoc_stream *st;
|
|
|
|
list_for_each_entry(st, &pd->stream_list, link) {
|
|
if (st->ep_num == ep_num)
|
|
return st;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Context: softirq
|
|
*/
|
|
int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num)
|
|
{
|
|
struct oz_isoc_stream *st;
|
|
|
|
st = kzalloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC);
|
|
if (!st)
|
|
return -ENOMEM;
|
|
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 = NULL;
|
|
}
|
|
spin_unlock_bh(&pd->stream_lock);
|
|
kfree(st);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Context: softirq or process
|
|
*/
|
|
static void oz_isoc_stream_free(struct oz_isoc_stream *st)
|
|
{
|
|
kfree_skb(st->skb);
|
|
kfree(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);
|
|
}
|
|
|
|
/*
|
|
* Context: softirq
|
|
*/
|
|
int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, const u8 *data, int len)
|
|
{
|
|
struct net_device *dev = pd->net_dev;
|
|
struct oz_isoc_stream *st;
|
|
u8 nb_units = 0;
|
|
struct sk_buff *skb = NULL;
|
|
struct oz_hdr *oz_hdr = NULL;
|
|
int size = 0;
|
|
|
|
spin_lock_bh(&pd->stream_lock);
|
|
st = pd_stream_find(pd, ep_num);
|
|
if (st) {
|
|
skb = st->skb;
|
|
st->skb = NULL;
|
|
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 == NULL)
|
|
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);
|
|
/* For audio packet set priority to AC_VO */
|
|
skb->priority = 0x7;
|
|
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)
|
|
goto out;
|
|
|
|
skb->destructor = oz_isoc_destructor;
|
|
/*Queue for Xmit if mode is not ANYTIME*/
|
|
if (!(pd->mode & OZ_F_ISOC_ANYTIME)) {
|
|
struct oz_tx_frame *isoc_unit = NULL;
|
|
int nb = pd->nb_queued_isoc_frames;
|
|
|
|
if (nb >= pd->isoc_latency) {
|
|
struct oz_tx_frame *f;
|
|
|
|
oz_dbg(TX_FRAMES, "Dropping ISOC Unit nb= %d\n",
|
|
nb);
|
|
spin_lock(&pd->tx_frame_lock);
|
|
list_for_each_entry(f, &pd->tx_queue, link) {
|
|
if (f->skb != NULL) {
|
|
oz_tx_isoc_free(pd, f);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&pd->tx_frame_lock);
|
|
}
|
|
isoc_unit = oz_tx_frame_alloc(pd);
|
|
if (isoc_unit == NULL)
|
|
goto out;
|
|
isoc_unit->hdr = oz;
|
|
isoc_unit->skb = skb;
|
|
spin_lock_bh(&pd->tx_frame_lock);
|
|
list_add_tail(&isoc_unit->link, &pd->tx_queue);
|
|
pd->nb_queued_isoc_frames++;
|
|
spin_unlock_bh(&pd->tx_frame_lock);
|
|
oz_dbg(TX_FRAMES,
|
|
"Added ISOC Frame to Tx Queue isoc_nb= %d, nb= %d\n",
|
|
pd->nb_queued_isoc_frames, pd->nb_queued_frames);
|
|
return 0;
|
|
}
|
|
|
|
/*In ANYTIME mode Xmit unit immediately*/
|
|
if (atomic_read(&g_submitted_isoc) < OZ_MAX_SUBMITTED_ISOC) {
|
|
atomic_inc(&g_submitted_isoc);
|
|
if (dev_queue_xmit(skb) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
out: kfree_skb(skb);
|
|
return -1;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Context: process
|
|
*/
|
|
void oz_apps_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < OZ_NB_APPS; 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_NB_APPS; 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)
|
|
{
|
|
if (app_id < OZ_NB_APPS && g_app_if[app_id].rx)
|
|
g_app_if[app_id].rx(pd, elt);
|
|
}
|
|
|
|
/*
|
|
* Context: softirq or process
|
|
*/
|
|
void oz_pd_indicate_farewells(struct oz_pd *pd)
|
|
{
|
|
struct oz_farewell *f;
|
|
const struct oz_app_if *ai = &g_app_if[OZ_APPID_USB];
|
|
|
|
while (1) {
|
|
spin_lock_bh(&g_polling_lock);
|
|
if (list_empty(&pd->farewell_list)) {
|
|
spin_unlock_bh(&g_polling_lock);
|
|
break;
|
|
}
|
|
f = list_first_entry(&pd->farewell_list,
|
|
struct oz_farewell, link);
|
|
list_del(&f->link);
|
|
spin_unlock_bh(&g_polling_lock);
|
|
if (ai->farewell)
|
|
ai->farewell(pd, f->ep_num, f->report, f->len);
|
|
kfree(f);
|
|
}
|
|
}
|