| /* ----------------------------------------------------------------------------- |
| * 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 "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 |
| /*------------------------------------------------------------------------------ |
| */ |
| 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 void oz_tx_isoc_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 const 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, |
| NULL, |
| NULL, |
| OZ_APPID_UNUSED1}, |
| |
| {oz_def_app_init, |
| oz_def_app_term, |
| oz_def_app_start, |
| oz_def_app_stop, |
| oz_def_app_rx, |
| NULL, |
| NULL, |
| OZ_APPID_UNUSED2}, |
| |
| {oz_cdev_init, |
| oz_cdev_term, |
| oz_cdev_start, |
| oz_cdev_stop, |
| oz_cdev_rx, |
| NULL, |
| NULL, |
| 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, NULL, 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(const u8 *mac_addr) |
| { |
| struct oz_pd *pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC); |
| if (pd) { |
| int i; |
| 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)) { |
| kfree(pd); |
| pd = NULL; |
| } |
| 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; |
| if (f->skb != NULL) |
| kfree_skb(f->skb); |
| 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; |
| kfree(fwell); |
| } |
| /* Deallocate all frames in tx pool. |
| */ |
| while (pd->tx_pool) { |
| e = pd->tx_pool; |
| pd->tx_pool = e->next; |
| kfree(container_of(e, struct oz_tx_frame, link)); |
| } |
| if (pd->net_dev) |
| dev_put(pd->net_dev); |
| kfree(pd); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| int oz_services_start(struct oz_pd *pd, u16 apps, int resume) |
| { |
| const 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) |
| { |
| const 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) |
| { |
| const 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 = NULL; |
| 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 == NULL) |
| f = kmalloc(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_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f) |
| { |
| pd->nb_queued_isoc_frames--; |
| list_del_init(&f->link); |
| 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++; |
| } else { |
| kfree(f); |
| } |
| oz_trace2(OZ_TRACE_TX_FRAMES, "Releasing ISOC Frame isoc_nb= %d\n", |
| pd->nb_queued_isoc_frames); |
| } |
| /*------------------------------------------------------------------------------ |
| * 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 = NULL; |
| } |
| spin_unlock_bh(&pd->tx_frame_lock); |
| kfree(f); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void oz_set_more_bit(struct sk_buff *skb) |
| { |
| struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb); |
| oz_hdr->control |= OZ_F_MORE_DATA; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void oz_set_last_pkt_nb(struct oz_pd *pd, struct sk_buff *skb) |
| { |
| struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb); |
| oz_hdr->last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; |
| } |
| /*------------------------------------------------------------------------------ |
| * 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 == NULL) |
| return -1; |
| f->skb = NULL; |
| 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; |
| 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 == NULL) |
| return NULL; |
| /* 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 NULL; |
| } |
| /*------------------------------------------------------------------------------ |
| * 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; |
| 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; |
| } |
| f = container_of(e, struct oz_tx_frame, link); |
| |
| if (f->skb != NULL) { |
| skb = f->skb; |
| 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_trace2(OZ_TRACE_TX_FRAMES, |
| "Dropping ISOC Frame\n"); |
| oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0); |
| return -1; |
| } |
| atomic_inc(&g_submitted_isoc); |
| oz_trace2(OZ_TRACE_TX_FRAMES, |
| "Sending ISOC Frame, nb_isoc= %d\n", |
| pd->nb_queued_isoc_frames); |
| return 0; |
| } else { |
| kfree_skb(skb); |
| oz_trace2(OZ_TRACE_TX_FRAMES, "Dropping ISOC Frame>\n"); |
| oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0); |
| return -1; |
| } |
| } |
| |
| pd->last_sent_frame = e; |
| skb = oz_build_frame(pd, f); |
| spin_unlock(&pd->tx_frame_lock); |
| if (more_data) |
| oz_set_more_bit(skb); |
| 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, |
| NULL, 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 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 == NULL) { |
| 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, NULL, 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 = NULL; |
| struct list_head *last = NULL; |
| 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) || (pkt_num == 0)) |
| break; |
| oz_trace2(OZ_TRACE_TX_FRAMES, "Releasing pkt_num= %u, nb= %d\n", |
| pkt_num, pd->nb_queued_frames); |
| if (first == NULL) |
| 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 = NULL; |
| } |
| 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 NULL; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq |
| */ |
| int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num) |
| { |
| struct oz_isoc_stream *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); |
| 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, 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) { |
| oz_trace2(OZ_TRACE_TX_FRAMES, |
| "Dropping ISOC Unit nb= %d\n", |
| nb); |
| goto out; |
| } |
| 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_trace2(OZ_TRACE_TX_FRAMES, |
| "Added ISOC Frame to Tx Queue isoc_nb= %d, nb= %d\n", |
| pd->nb_queued_isoc_frames, pd->nb_queued_frames); |
| oz_event_log(OZ_EVT_TX_ISOC, nb_units, iso.frame_number, |
| skb, atomic_read(&g_submitted_isoc)); |
| return 0; |
| } |
| |
| /*In ANYTIME mode Xmit unit immediately*/ |
| if (atomic_read(&g_submitted_isoc) < OZ_MAX_SUBMITTED_ISOC) { |
| 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) { |
| oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0); |
| return -1; |
| } else |
| return 0; |
| } |
| |
| out: oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0); |
| kfree_skb(skb); |
| return -1; |
| |
| } |
| 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) |
| { |
| const struct oz_app_if *ai; |
| if (app_id == 0 || 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; |
| const 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); |
| kfree(f); |
| } |
| } |
