drivers/staging/ozwpan/ozpd.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  * -----------------------------------------------------------------------------
   5  */
   6 #include <linux/init.h>
   7 #include <linux/module.h>
   8 #include <linux/timer.h>
   9 #include <linux/sched.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/errno.h>
  12 #include "ozdbg.h"
  13 #include "ozconfig.h"
  14 #include "ozprotocol.h"
  15 #include "ozeltbuf.h"
  16 #include "ozpd.h"
  17 #include "ozproto.h"
  18 #include "oztrace.h"
  19 #include "ozcdev.h"
  20 #include "ozusbsvc.h"
  21 #include <asm/unaligned.h>
  22 #include <linux/uaccess.h>
  23 #include <net/psnap.h>
  24 /*------------------------------------------------------------------------------
  25  */
  26 #define OZ_MAX_TX_POOL_SIZE     6
  27 /*------------------------------------------------------------------------------
  28  */
  29 static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd);
  30 static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f);
  31 static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f);
  32 static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f);
  33 static int oz_send_isoc_frame(struct oz_pd *pd);
  34 static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f);
  35 static void oz_isoc_stream_free(struct oz_isoc_stream *st);
  36 static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data);
  37 static void oz_isoc_destructor(struct sk_buff *skb);
  38 static int oz_def_app_init(void);
  39 static void oz_def_app_term(void);
  40 static int oz_def_app_start(struct oz_pd *pd, int resume);
  41 static void oz_def_app_stop(struct oz_pd *pd, int pause);
  42 static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt);
  43 /*------------------------------------------------------------------------------
  44  * Counts the uncompleted isoc frames submitted to netcard.
  45  */
  46 static atomic_t g_submitted_isoc = ATOMIC_INIT(0);
  47 /* Application handler functions.
  48  */
  49 static const struct oz_app_if g_app_if[OZ_APPID_MAX] = {
  50         {oz_usb_init,
  51         oz_usb_term,
  52         oz_usb_start,
  53         oz_usb_stop,
  54         oz_usb_rx,
  55         oz_usb_heartbeat,
  56         oz_usb_farewell,
  57         OZ_APPID_USB},
  58
  59         {oz_def_app_init,
  60         oz_def_app_term,
  61         oz_def_app_start,
  62         oz_def_app_stop,
  63         oz_def_app_rx,
  64         NULL,
  65         NULL,
  66         OZ_APPID_UNUSED1},
  67
  68         {oz_def_app_init,
  69         oz_def_app_term,
  70         oz_def_app_start,
  71         oz_def_app_stop,
  72         oz_def_app_rx,
  73         NULL,
  74         NULL,
  75         OZ_APPID_UNUSED2},
  76
  77         {oz_cdev_init,
  78         oz_cdev_term,
  79         oz_cdev_start,
  80         oz_cdev_stop,
  81         oz_cdev_rx,
  82         NULL,
  83         NULL,
  84         OZ_APPID_SERIAL},
  85 };
  86 /*------------------------------------------------------------------------------
  87  * Context: process
  88  */
  89 static int oz_def_app_init(void)
  90 {
  91         return 0;
  92 }
  93 /*------------------------------------------------------------------------------
  94  * Context: process
  95  */
  96 static void oz_def_app_term(void)
  97 {
  98 }
  99 /*------------------------------------------------------------------------------
 100  * Context: softirq
 101  */
 102 static int oz_def_app_start(struct oz_pd *pd, int resume)
 103 {
 104         return 0;
 105 }
 106 /*------------------------------------------------------------------------------
 107  * Context: softirq
 108  */
 109 static void oz_def_app_stop(struct oz_pd *pd, int pause)
 110 {
 111 }
 112 /*------------------------------------------------------------------------------
 113  * Context: softirq
 114  */
 115 static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt)
 116 {
 117 }
 118 /*------------------------------------------------------------------------------
 119  * Context: softirq or process
 120  */
 121 void oz_pd_set_state(struct oz_pd *pd, unsigned state)
 122 {
 123         pd->state = state;
 124 #ifdef WANT_TRACE
 125         switch (state) {
 126         case OZ_PD_S_IDLE:
 127                 oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_IDLE\n");
 128                 break;
 129         case OZ_PD_S_CONNECTED:
 130                 oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_CONNECTED\n");
 131                 break;
 132         case OZ_PD_S_STOPPED:
 133                 oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_STOPPED\n");
 134                 break;
 135         case OZ_PD_S_SLEEP:
 136                 oz_pd_dbg(pd, ON, "PD State: OZ_PD_S_SLEEP\n");
 137                 break;
 138         }
 139 #endif /* WANT_TRACE */
 140 }
 141 /*------------------------------------------------------------------------------
 142  * Context: softirq or process
 143  */
 144 void oz_pd_get(struct oz_pd *pd)
 145 {
 146         atomic_inc(&pd->ref_count);
 147 }
 148 /*------------------------------------------------------------------------------
 149  * Context: softirq or process
 150  */
 151 void oz_pd_put(struct oz_pd *pd)
 152 {
 153         if (atomic_dec_and_test(&pd->ref_count))
 154                 oz_pd_destroy(pd);
 155 }
 156 /*------------------------------------------------------------------------------
 157  * Context: softirq-serialized
 158  */
 159 struct oz_pd *oz_pd_alloc(const u8 *mac_addr)
 160 {
 161         struct oz_pd *pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC);
 162         if (pd) {
 163                 int i;
 164                 atomic_set(&pd->ref_count, 2);
 165                 for (i = 0; i < OZ_APPID_MAX; i++)
 166                         spin_lock_init(&pd->app_lock[i]);
 167                 pd->last_rx_pkt_num = 0xffffffff;
 168                 oz_pd_set_state(pd, OZ_PD_S_IDLE);
 169                 pd->max_tx_size = OZ_MAX_TX_SIZE;
 170                 memcpy(pd->mac_addr, mac_addr, ETH_ALEN);
 171                 if (0 != oz_elt_buf_init(&pd->elt_buff)) {
 172                         kfree(pd);
 173                         pd = NULL;
 174                 }
 175                 spin_lock_init(&pd->tx_frame_lock);
 176                 INIT_LIST_HEAD(&pd->tx_queue);
 177                 INIT_LIST_HEAD(&pd->farewell_list);
 178                 pd->last_sent_frame = &pd->tx_queue;
 179                 spin_lock_init(&pd->stream_lock);
 180                 INIT_LIST_HEAD(&pd->stream_list);
 181         }
 182         return pd;
 183 }
 184 /*------------------------------------------------------------------------------
 185  * Context: softirq or process
 186  */
 187 void oz_pd_destroy(struct oz_pd *pd)
 188 {
 189         struct list_head *e;
 190         struct oz_tx_frame *f;
 191         struct oz_isoc_stream *st;
 192         struct oz_farewell *fwell;
 193         oz_pd_dbg(pd, ON, "Destroying PD\n");
 194         /* Delete any streams.
 195          */
 196         e = pd->stream_list.next;
 197         while (e != &pd->stream_list) {
 198                 st = container_of(e, struct oz_isoc_stream, link);
 199                 e = e->next;
 200                 oz_isoc_stream_free(st);
 201         }
 202         /* Free any queued tx frames.
 203          */
 204         e = pd->tx_queue.next;
 205         while (e != &pd->tx_queue) {
 206                 f = container_of(e, struct oz_tx_frame, link);
 207                 e = e->next;
 208                 if (f->skb != NULL)
 209                         kfree_skb(f->skb);
 210                 oz_retire_frame(pd, f);
 211         }
 212         oz_elt_buf_term(&pd->elt_buff);
 213         /* Free any farewells.
 214          */
 215         e = pd->farewell_list.next;
 216         while (e != &pd->farewell_list) {
 217                 fwell = container_of(e, struct oz_farewell, link);
 218                 e = e->next;
 219                 kfree(fwell);
 220         }
 221         /* Deallocate all frames in tx pool.
 222          */
 223         while (pd->tx_pool) {
 224                 e = pd->tx_pool;
 225                 pd->tx_pool = e->next;
 226                 kfree(container_of(e, struct oz_tx_frame, link));
 227         }
 228         if (pd->net_dev)
 229                 dev_put(pd->net_dev);
 230         kfree(pd);
 231 }
 232 /*------------------------------------------------------------------------------
 233  * Context: softirq-serialized
 234  */
 235 int oz_services_start(struct oz_pd *pd, u16 apps, int resume)
 236 {
 237         const struct oz_app_if *ai;
 238         int rc = 0;
 239         oz_pd_dbg(pd, ON, "%s: (0x%x) resume(%d)\n", __func__, apps, resume);
 240         for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) {
 241                 if (apps & (1<<ai->app_id)) {
 242                         if (ai->start(pd, resume)) {
 243                                 rc = -1;
 244                                 oz_pd_dbg(pd, ON,
 245                                           "Unable to start service %d\n",
 246                                           ai->app_id);
 247                                 break;
 248                         }
 249                         oz_polling_lock_bh();
 250                         pd->total_apps |= (1<<ai->app_id);
 251                         if (resume)
 252                                 pd->paused_apps &= ~(1<<ai->app_id);
 253                         oz_polling_unlock_bh();
 254                 }
 255         }
 256         return rc;
 257 }
 258 /*------------------------------------------------------------------------------
 259  * Context: softirq or process
 260  */
 261 void oz_services_stop(struct oz_pd *pd, u16 apps, int pause)
 262 {
 263         const struct oz_app_if *ai;
 264         oz_pd_dbg(pd, ON, "%s: (0x%x) pause(%d)\n", __func__, apps, pause);
 265         for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) {
 266                 if (apps & (1<<ai->app_id)) {
 267                         oz_polling_lock_bh();
 268                         if (pause) {
 269                                 pd->paused_apps |= (1<<ai->app_id);
 270                         } else {
 271                                 pd->total_apps &= ~(1<<ai->app_id);
 272                                 pd->paused_apps &= ~(1<<ai->app_id);
 273                         }
 274                         oz_polling_unlock_bh();
 275                         ai->stop(pd, pause);
 276                 }
 277         }
 278 }
 279 /*------------------------------------------------------------------------------
 280  * Context: softirq
 281  */
 282 void oz_pd_heartbeat(struct oz_pd *pd, u16 apps)
 283 {
 284         const struct oz_app_if *ai;
 285         int more = 0;
 286         for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) {
 287                 if (ai->heartbeat && (apps & (1<<ai->app_id))) {
 288                         if (ai->heartbeat(pd))
 289                                 more = 1;
 290                 }
 291         }
 292         if (more)
 293                 oz_pd_request_heartbeat(pd);
 294         if (pd->mode & OZ_F_ISOC_ANYTIME) {
 295                 int count = 8;
 296                 while (count-- && (oz_send_isoc_frame(pd) >= 0))
 297                         ;
 298         }
 299 }
 300 /*------------------------------------------------------------------------------
 301  * Context: softirq or process
 302  */
 303 void oz_pd_stop(struct oz_pd *pd)
 304 {
 305         u16 stop_apps = 0;
 306         oz_dbg(ON, "oz_pd_stop() State = 0x%x\n", pd->state);
 307         oz_pd_indicate_farewells(pd);
 308         oz_polling_lock_bh();
 309         stop_apps = pd->total_apps;
 310         pd->total_apps = 0;
 311         pd->paused_apps = 0;
 312         oz_polling_unlock_bh();
 313         oz_services_stop(pd, stop_apps, 0);
 314         oz_polling_lock_bh();
 315         oz_pd_set_state(pd, OZ_PD_S_STOPPED);
 316         /* Remove from PD list.*/
 317         list_del(&pd->link);
 318         oz_polling_unlock_bh();
 319         oz_dbg(ON, "pd ref count = %d\n", atomic_read(&pd->ref_count));
 320         oz_timer_delete(pd, 0);
 321         oz_pd_put(pd);
 322 }
 323 /*------------------------------------------------------------------------------
 324  * Context: softirq
 325  */
 326 int oz_pd_sleep(struct oz_pd *pd)
 327 {
 328         int do_stop = 0;
 329         u16 stop_apps = 0;
 330         oz_polling_lock_bh();
 331         if (pd->state & (OZ_PD_S_SLEEP | OZ_PD_S_STOPPED)) {
 332                 oz_polling_unlock_bh();
 333                 return 0;
 334         }
 335         if (pd->keep_alive_j && pd->session_id) {
 336                 oz_pd_set_state(pd, OZ_PD_S_SLEEP);
 337                 pd->pulse_time_j = jiffies + pd->keep_alive_j;
 338                 oz_dbg(ON, "Sleep Now %lu until %lu\n",
 339                        jiffies, pd->pulse_time_j);
 340         } else {
 341                 do_stop = 1;
 342         }
 343         stop_apps = pd->total_apps;
 344         oz_polling_unlock_bh();
 345         if (do_stop) {
 346                 oz_pd_stop(pd);
 347         } else {
 348                 oz_services_stop(pd, stop_apps, 1);
 349                 oz_timer_add(pd, OZ_TIMER_STOP, jiffies + pd->keep_alive_j, 1);
 350         }
 351         return do_stop;
 352 }
 353 /*------------------------------------------------------------------------------
 354  * Context: softirq
 355  */
 356 static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd)
 357 {
 358         struct oz_tx_frame *f = NULL;
 359         spin_lock_bh(&pd->tx_frame_lock);
 360         if (pd->tx_pool) {
 361                 f = container_of(pd->tx_pool, struct oz_tx_frame, link);
 362                 pd->tx_pool = pd->tx_pool->next;
 363                 pd->tx_pool_count--;
 364         }
 365         spin_unlock_bh(&pd->tx_frame_lock);
 366         if (f == NULL)
 367                 f = kmalloc(sizeof(struct oz_tx_frame), GFP_ATOMIC);
 368         if (f) {
 369                 f->total_size = sizeof(struct oz_hdr);
 370                 INIT_LIST_HEAD(&f->link);
 371                 INIT_LIST_HEAD(&f->elt_list);
 372         }
 373         return f;
 374 }
 375 /*------------------------------------------------------------------------------
 376  * Context: softirq or process
 377  */
 378 static void oz_tx_isoc_free(struct oz_pd *pd, struct oz_tx_frame *f)
 379 {
 380         pd->nb_queued_isoc_frames--;
 381         list_del_init(&f->link);
 382         if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) {
 383                 f->link.next = pd->tx_pool;
 384                 pd->tx_pool = &f->link;
 385                 pd->tx_pool_count++;
 386         } else {
 387                 kfree(f);
 388         }
 389         oz_dbg(TX_FRAMES, "Releasing ISOC Frame isoc_nb= %d\n",
 390                pd->nb_queued_isoc_frames);
 391 }
 392 /*------------------------------------------------------------------------------
 393  * Context: softirq or process
 394  */
 395 static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f)
 396 {
 397         spin_lock_bh(&pd->tx_frame_lock);
 398         if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) {
 399                 f->link.next = pd->tx_pool;
 400                 pd->tx_pool = &f->link;
 401                 pd->tx_pool_count++;
 402                 f = NULL;
 403         }
 404         spin_unlock_bh(&pd->tx_frame_lock);
 405         kfree(f);
 406 }
 407 /*------------------------------------------------------------------------------
 408  * Context: softirq-serialized
 409  */
 410 static void oz_set_more_bit(struct sk_buff *skb)
 411 {
 412         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 413         oz_hdr->control |= OZ_F_MORE_DATA;
 414 }
 415 /*------------------------------------------------------------------------------
 416  * Context: softirq-serialized
 417  */
 418 static void oz_set_last_pkt_nb(struct oz_pd *pd, struct sk_buff *skb)
 419 {
 420         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 421         oz_hdr->last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
 422 }
 423 /*------------------------------------------------------------------------------
 424  * Context: softirq
 425  */
 426 int oz_prepare_frame(struct oz_pd *pd, int empty)
 427 {
 428         struct oz_tx_frame *f;
 429         if ((pd->mode & OZ_MODE_MASK) != OZ_MODE_TRIGGERED)
 430                 return -1;
 431         if (pd->nb_queued_frames >= OZ_MAX_QUEUED_FRAMES)
 432                 return -1;
 433         if (!empty && !oz_are_elts_available(&pd->elt_buff))
 434                 return -1;
 435         f = oz_tx_frame_alloc(pd);
 436         if (f == NULL)
 437                 return -1;
 438         f->skb = NULL;
 439         f->hdr.control =
 440                 (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ACK_REQUESTED;
 441         ++pd->last_tx_pkt_num;
 442         put_unaligned(cpu_to_le32(pd->last_tx_pkt_num), &f->hdr.pkt_num);
 443         if (empty == 0) {
 444                 oz_select_elts_for_tx(&pd->elt_buff, 0, &f->total_size,
 445                         pd->max_tx_size, &f->elt_list);
 446         }
 447         spin_lock(&pd->tx_frame_lock);
 448         list_add_tail(&f->link, &pd->tx_queue);
 449         pd->nb_queued_frames++;
 450         spin_unlock(&pd->tx_frame_lock);
 451         return 0;
 452 }
 453 /*------------------------------------------------------------------------------
 454  * Context: softirq-serialized
 455  */
 456 static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f)
 457 {
 458         struct sk_buff *skb;
 459         struct net_device *dev = pd->net_dev;
 460         struct oz_hdr *oz_hdr;
 461         struct oz_elt *elt;
 462         struct list_head *e;
 463         /* Allocate skb with enough space for the lower layers as well
 464          * as the space we need.
 465          */
 466         skb = alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 467         if (skb == NULL)
 468                 return NULL;
 469         /* Reserve the head room for lower layers.
 470          */
 471         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 472         skb_reset_network_header(skb);
 473         skb->dev = dev;
 474         skb->protocol = htons(OZ_ETHERTYPE);
 475         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 476                 dev->dev_addr, skb->len) < 0)
 477                 goto fail;
 478         /* Push the tail to the end of the area we are going to copy to.
 479          */
 480         oz_hdr = (struct oz_hdr *)skb_put(skb, f->total_size);
 481         f->hdr.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
 482         memcpy(oz_hdr, &f->hdr, sizeof(struct oz_hdr));
 483         /* Copy the elements into the frame body.
 484          */
 485         elt = (struct oz_elt *)(oz_hdr+1);
 486         for (e = f->elt_list.next; e != &f->elt_list; e = e->next) {
 487                 struct oz_elt_info *ei;
 488                 ei = container_of(e, struct oz_elt_info, link);
 489                 memcpy(elt, ei->data, ei->length);
 490                 elt = oz_next_elt(elt);
 491         }
 492         return skb;
 493 fail:
 494         kfree_skb(skb);
 495         return NULL;
 496 }
 497 /*------------------------------------------------------------------------------
 498  * Context: softirq or process
 499  */
 500 static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f)
 501 {
 502         struct list_head *e;
 503         struct oz_elt_info *ei;
 504         e = f->elt_list.next;
 505         while (e != &f->elt_list) {
 506                 ei = container_of(e, struct oz_elt_info, link);
 507                 e = e->next;
 508                 list_del_init(&ei->link);
 509                 if (ei->callback)
 510                         ei->callback(pd, ei->context);
 511                 spin_lock_bh(&pd->elt_buff.lock);
 512                 oz_elt_info_free(&pd->elt_buff, ei);
 513                 spin_unlock_bh(&pd->elt_buff.lock);
 514         }
 515         oz_tx_frame_free(pd, f);
 516         if (pd->elt_buff.free_elts > pd->elt_buff.max_free_elts)
 517                 oz_trim_elt_pool(&pd->elt_buff);
 518 }
 519 /*------------------------------------------------------------------------------
 520  * Context: softirq-serialized
 521  */
 522 static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data)
 523 {
 524         struct sk_buff *skb;
 525         struct oz_tx_frame *f;
 526         struct list_head *e;
 527         spin_lock(&pd->tx_frame_lock);
 528         e = pd->last_sent_frame->next;
 529         if (e == &pd->tx_queue) {
 530                 spin_unlock(&pd->tx_frame_lock);
 531                 return -1;
 532         }
 533         f = container_of(e, struct oz_tx_frame, link);
 534
 535         if (f->skb != NULL) {
 536                 skb = f->skb;
 537                 oz_tx_isoc_free(pd, f);
 538                 spin_unlock(&pd->tx_frame_lock);
 539                 if (more_data)
 540                         oz_set_more_bit(skb);
 541                 oz_set_last_pkt_nb(pd, skb);
 542                 if ((int)atomic_read(&g_submitted_isoc) <
 543                                                         OZ_MAX_SUBMITTED_ISOC) {
 544                         if (dev_queue_xmit(skb) < 0) {
 545                                 oz_dbg(TX_FRAMES, "Dropping ISOC Frame\n");
 546                                 return -1;
 547                         }
 548                         atomic_inc(&g_submitted_isoc);
 549                         oz_dbg(TX_FRAMES, "Sending ISOC Frame, nb_isoc= %d\n",
 550                                pd->nb_queued_isoc_frames);
 551                         return 0;
 552                 } else {
 553                         kfree_skb(skb);
 554                         oz_dbg(TX_FRAMES, "Dropping ISOC Frame>\n");
 555                         return -1;
 556                 }
 557         }
 558
 559         pd->last_sent_frame = e;
 560         skb = oz_build_frame(pd, f);
 561         spin_unlock(&pd->tx_frame_lock);
 562         if (more_data)
 563                 oz_set_more_bit(skb);
 564         oz_dbg(TX_FRAMES, "TX frame PN=0x%x\n", f->hdr.pkt_num);
 565         if (skb) {
 566                 if (dev_queue_xmit(skb) < 0)
 567                         return -1;
 568
 569         }
 570         return 0;
 571 }
 572 /*------------------------------------------------------------------------------
 573  * Context: softirq-serialized
 574  */
 575 void oz_send_queued_frames(struct oz_pd *pd, int backlog)
 576 {
 577         while (oz_prepare_frame(pd, 0) >= 0)
 578                 backlog++;
 579
 580         switch (pd->mode & (OZ_F_ISOC_NO_ELTS | OZ_F_ISOC_ANYTIME)) {
 581
 582                 case OZ_F_ISOC_NO_ELTS: {
 583                         backlog += pd->nb_queued_isoc_frames;
 584                         if (backlog <= 0)
 585                                 goto out;
 586                         if (backlog > OZ_MAX_SUBMITTED_ISOC)
 587                                 backlog = OZ_MAX_SUBMITTED_ISOC;
 588                         break;
 589                 }
 590                 case OZ_NO_ELTS_ANYTIME: {
 591                         if ((backlog <= 0) && (pd->isoc_sent == 0))
 592                                 goto out;
 593                         break;
 594                 }
 595                 default: {
 596                         if (backlog <= 0)
 597                                 goto out;
 598                         break;
 599                 }
 600         }
 601         while (backlog--) {
 602                 if (oz_send_next_queued_frame(pd, backlog) < 0)
 603                         break;
 604         }
 605         return;
 606
 607 out:    oz_prepare_frame(pd, 1);
 608         oz_send_next_queued_frame(pd, 0);
 609 }
 610 /*------------------------------------------------------------------------------
 611  * Context: softirq
 612  */
 613 static int oz_send_isoc_frame(struct oz_pd *pd)
 614 {
 615         struct sk_buff *skb;
 616         struct net_device *dev = pd->net_dev;
 617         struct oz_hdr *oz_hdr;
 618         struct oz_elt *elt;
 619         struct list_head *e;
 620         struct list_head list;
 621         int total_size = sizeof(struct oz_hdr);
 622         INIT_LIST_HEAD(&list);
 623
 624         oz_select_elts_for_tx(&pd->elt_buff, 1, &total_size,
 625                 pd->max_tx_size, &list);
 626         if (list.next == &list)
 627                 return 0;
 628         skb = alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 629         if (skb == NULL) {
 630                 oz_dbg(ON, "Cannot alloc skb\n");
 631                 oz_elt_info_free_chain(&pd->elt_buff, &list);
 632                 return -1;
 633         }
 634         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 635         skb_reset_network_header(skb);
 636         skb->dev = dev;
 637         skb->protocol = htons(OZ_ETHERTYPE);
 638         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 639                 dev->dev_addr, skb->len) < 0) {
 640                 kfree_skb(skb);
 641                 return -1;
 642         }
 643         oz_hdr = (struct oz_hdr *)skb_put(skb, total_size);
 644         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ISOC;
 645         oz_hdr->last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
 646         elt = (struct oz_elt *)(oz_hdr+1);
 647
 648         for (e = list.next; e != &list; e = e->next) {
 649                 struct oz_elt_info *ei;
 650                 ei = container_of(e, struct oz_elt_info, link);
 651                 memcpy(elt, ei->data, ei->length);
 652                 elt = oz_next_elt(elt);
 653         }
 654         dev_queue_xmit(skb);
 655         oz_elt_info_free_chain(&pd->elt_buff, &list);
 656         return 0;
 657 }
 658 /*------------------------------------------------------------------------------
 659  * Context: softirq-serialized
 660  */
 661 void oz_retire_tx_frames(struct oz_pd *pd, u8 lpn)
 662 {
 663         struct list_head *e;
 664         struct oz_tx_frame *f;
 665         struct list_head *first = NULL;
 666         struct list_head *last = NULL;
 667         u8 diff;
 668         u32 pkt_num;
 669
 670         spin_lock(&pd->tx_frame_lock);
 671         e = pd->tx_queue.next;
 672         while (e != &pd->tx_queue) {
 673                 f = container_of(e, struct oz_tx_frame, link);
 674                 pkt_num = le32_to_cpu(get_unaligned(&f->hdr.pkt_num));
 675                 diff = (lpn - (pkt_num & OZ_LAST_PN_MASK)) & OZ_LAST_PN_MASK;
 676                 if ((diff > OZ_LAST_PN_HALF_CYCLE) || (pkt_num == 0))
 677                         break;
 678                 oz_dbg(TX_FRAMES, "Releasing pkt_num= %u, nb= %d\n",
 679                        pkt_num, pd->nb_queued_frames);
 680                 if (first == NULL)
 681                         first = e;
 682                 last = e;
 683                 e = e->next;
 684                 pd->nb_queued_frames--;
 685         }
 686         if (first) {
 687                 last->next->prev = &pd->tx_queue;
 688                 pd->tx_queue.next = last->next;
 689                 last->next = NULL;
 690         }
 691         pd->last_sent_frame = &pd->tx_queue;
 692         spin_unlock(&pd->tx_frame_lock);
 693         while (first) {
 694                 f = container_of(first, struct oz_tx_frame, link);
 695                 first = first->next;
 696                 oz_retire_frame(pd, f);
 697         }
 698 }
 699 /*------------------------------------------------------------------------------
 700  * Precondition: stream_lock must be held.
 701  * Context: softirq
 702  */
 703 static struct oz_isoc_stream *pd_stream_find(struct oz_pd *pd, u8 ep_num)
 704 {
 705         struct list_head *e;
 706         struct oz_isoc_stream *st;
 707         list_for_each(e, &pd->stream_list) {
 708                 st = container_of(e, struct oz_isoc_stream, link);
 709                 if (st->ep_num == ep_num)
 710                         return st;
 711         }
 712         return NULL;
 713 }
 714 /*------------------------------------------------------------------------------
 715  * Context: softirq
 716  */
 717 int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num)
 718 {
 719         struct oz_isoc_stream *st =
 720                 kzalloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC);
 721         if (!st)
 722                 return -ENOMEM;
 723         st->ep_num = ep_num;
 724         spin_lock_bh(&pd->stream_lock);
 725         if (!pd_stream_find(pd, ep_num)) {
 726                 list_add(&st->link, &pd->stream_list);
 727                 st = NULL;
 728         }
 729         spin_unlock_bh(&pd->stream_lock);
 730         kfree(st);
 731         return 0;
 732 }
 733 /*------------------------------------------------------------------------------
 734  * Context: softirq or process
 735  */
 736 static void oz_isoc_stream_free(struct oz_isoc_stream *st)
 737 {
 738         kfree_skb(st->skb);
 739         kfree(st);
 740 }
 741 /*------------------------------------------------------------------------------
 742  * Context: softirq
 743  */
 744 int oz_isoc_stream_delete(struct oz_pd *pd, u8 ep_num)
 745 {
 746         struct oz_isoc_stream *st;
 747         spin_lock_bh(&pd->stream_lock);
 748         st = pd_stream_find(pd, ep_num);
 749         if (st)
 750                 list_del(&st->link);
 751         spin_unlock_bh(&pd->stream_lock);
 752         if (st)
 753                 oz_isoc_stream_free(st);
 754         return 0;
 755 }
 756 /*------------------------------------------------------------------------------
 757  * Context: any
 758  */
 759 static void oz_isoc_destructor(struct sk_buff *skb)
 760 {
 761         atomic_dec(&g_submitted_isoc);
 762 }
 763 /*------------------------------------------------------------------------------
 764  * Context: softirq
 765  */
 766 int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, const u8 *data, int len)
 767 {
 768         struct net_device *dev = pd->net_dev;
 769         struct oz_isoc_stream *st;
 770         u8 nb_units = 0;
 771         struct sk_buff *skb = NULL;
 772         struct oz_hdr *oz_hdr = NULL;
 773         int size = 0;
 774         spin_lock_bh(&pd->stream_lock);
 775         st = pd_stream_find(pd, ep_num);
 776         if (st) {
 777                 skb = st->skb;
 778                 st->skb = NULL;
 779                 nb_units = st->nb_units;
 780                 st->nb_units = 0;
 781                 oz_hdr = st->oz_hdr;
 782                 size = st->size;
 783         }
 784         spin_unlock_bh(&pd->stream_lock);
 785         if (!st)
 786                 return 0;
 787         if (!skb) {
 788                 /* Allocate enough space for max size frame. */
 789                 skb = alloc_skb(pd->max_tx_size + OZ_ALLOCATED_SPACE(dev),
 790                                 GFP_ATOMIC);
 791                 if (skb == NULL)
 792                         return 0;
 793                 /* Reserve the head room for lower layers. */
 794                 skb_reserve(skb, LL_RESERVED_SPACE(dev));
 795                 skb_reset_network_header(skb);
 796                 skb->dev = dev;
 797                 skb->protocol = htons(OZ_ETHERTYPE);
 798                 /* For audio packet set priority to AC_VO */
 799                 skb->priority = 0x7;
 800                 size = sizeof(struct oz_hdr) + sizeof(struct oz_isoc_large);
 801                 oz_hdr = (struct oz_hdr *)skb_put(skb, size);
 802         }
 803         memcpy(skb_put(skb, len), data, len);
 804         size += len;
 805         if (++nb_units < pd->ms_per_isoc) {
 806                 spin_lock_bh(&pd->stream_lock);
 807                 st->skb = skb;
 808                 st->nb_units = nb_units;
 809                 st->oz_hdr = oz_hdr;
 810                 st->size = size;
 811                 spin_unlock_bh(&pd->stream_lock);
 812         } else {
 813                 struct oz_hdr oz;
 814                 struct oz_isoc_large iso;
 815                 spin_lock_bh(&pd->stream_lock);
 816                 iso.frame_number = st->frame_num;
 817                 st->frame_num += nb_units;
 818                 spin_unlock_bh(&pd->stream_lock);
 819                 oz.control =
 820                         (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ISOC;
 821                 oz.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK;
 822                 oz.pkt_num = 0;
 823                 iso.endpoint = ep_num;
 824                 iso.format = OZ_DATA_F_ISOC_LARGE;
 825                 iso.ms_data = nb_units;
 826                 memcpy(oz_hdr, &oz, sizeof(oz));
 827                 memcpy(oz_hdr+1, &iso, sizeof(iso));
 828                 if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 829                                 dev->dev_addr, skb->len) < 0)
 830                         goto out;
 831
 832                 skb->destructor = oz_isoc_destructor;
 833                 /*Queue for Xmit if mode is not ANYTIME*/
 834                 if (!(pd->mode & OZ_F_ISOC_ANYTIME)) {
 835                         struct oz_tx_frame *isoc_unit = NULL;
 836                         int nb = pd->nb_queued_isoc_frames;
 837                         if (nb >= pd->isoc_latency) {
 838                                 oz_dbg(TX_FRAMES, "Dropping ISOC Unit nb= %d\n",
 839                                        nb);
 840                                 goto out;
 841                         }
 842                         isoc_unit = oz_tx_frame_alloc(pd);
 843                         if (isoc_unit == NULL)
 844                                 goto out;
 845                         isoc_unit->hdr = oz;
 846                         isoc_unit->skb = skb;
 847                         spin_lock_bh(&pd->tx_frame_lock);
 848                         list_add_tail(&isoc_unit->link, &pd->tx_queue);
 849                         pd->nb_queued_isoc_frames++;
 850                         spin_unlock_bh(&pd->tx_frame_lock);
 851                         oz_dbg(TX_FRAMES,
 852                                "Added ISOC Frame to Tx Queue isoc_nb= %d, nb= %d\n",
 853                                pd->nb_queued_isoc_frames, pd->nb_queued_frames);
 854                         return 0;
 855                 }
 856
 857                 /*In ANYTIME mode Xmit unit immediately*/
 858                 if (atomic_read(&g_submitted_isoc) < OZ_MAX_SUBMITTED_ISOC) {
 859                         atomic_inc(&g_submitted_isoc);
 860                         if (dev_queue_xmit(skb) < 0)
 861                                 return -1;
 862                         else
 863                                 return 0;
 864                 }
 865
 866 out:    kfree_skb(skb);
 867         return -1;
 868
 869         }
 870         return 0;
 871 }
 872 /*------------------------------------------------------------------------------
 873  * Context: process
 874  */
 875 void oz_apps_init(void)
 876 {
 877         int i;
 878         for (i = 0; i < OZ_APPID_MAX; i++)
 879                 if (g_app_if[i].init)
 880                         g_app_if[i].init();
 881 }
 882 /*------------------------------------------------------------------------------
 883  * Context: process
 884  */
 885 void oz_apps_term(void)
 886 {
 887         int i;
 888         /* Terminate all the apps. */
 889         for (i = 0; i < OZ_APPID_MAX; i++)
 890                 if (g_app_if[i].term)
 891                         g_app_if[i].term();
 892 }
 893 /*------------------------------------------------------------------------------
 894  * Context: softirq-serialized
 895  */
 896 void oz_handle_app_elt(struct oz_pd *pd, u8 app_id, struct oz_elt *elt)
 897 {
 898         const struct oz_app_if *ai;
 899         if (app_id == 0 || app_id > OZ_APPID_MAX)
 900                 return;
 901         ai = &g_app_if[app_id-1];
 902         ai->rx(pd, elt);
 903 }
 904 /*------------------------------------------------------------------------------
 905  * Context: softirq or process
 906  */
 907 void oz_pd_indicate_farewells(struct oz_pd *pd)
 908 {
 909         struct oz_farewell *f;
 910         const struct oz_app_if *ai = &g_app_if[OZ_APPID_USB-1];
 911         while (1) {
 912                 oz_polling_lock_bh();
 913                 if (list_empty(&pd->farewell_list)) {
 914                         oz_polling_unlock_bh();
 915                         break;
 916                 }
 917                 f = list_first_entry(&pd->farewell_list,
 918                                 struct oz_farewell, link);
 919                 list_del(&f->link);
 920                 oz_polling_unlock_bh();
 921                 if (ai->farewell)
 922                         ai->farewell(pd, f->ep_num, f->report, f->len);
 923                 kfree(f);
 924         }
 925 }