src_frescan/frescan.c

   1 /*!
   2  * @file frescan.c
   3  *
   4  * @brief the FRESCAN protocol
   5  *
   6  * @version 0.01
   7  *
   8  * @date 20-Feb-2008
   9  *
  10  * @author
  11  *      Daniel Sangorrin
  12  *
  13  * @comments
  14  *
  15  * This file contains the implementation of the FRESCAN protocol
  16  *
  17  * @license
  18  *
  19  * See MaRTE OS license
  20  *
  21  */
  22
  23 #include <sys/marte_configuration_parameters.h> // PATH_MX
  24 #include <fcntl.h>  // open
  25 #include <unistd.h> // ioctl
  26 #include <stdlib.h> // malloc
  27 #include <string.h> // memcpy
  28
  29 #include <drivers/can.h>       // can_chip_t, can_frame_t
  30 #include "frescan.h"           // frescan_init_params_t, frescan_send_params_t
  31 #include "frescan_queues.h"    // init, enqueue, requeue
  32 #include "frescan_data.h"      // init, the_networks
  33 #include "frescan_servers.h"   // init, frame_sent
  34 #include "frescan_debug.h"     // DEBUG
  35 #include "frescan_id.h"        // frescan_id_set_field, frescan_id_get_field
  36 #include "frescan_hw_buffer.h" // frescan_hw_buffer_update
  37 #include "frescan_bwres_robjs.h"     // frescan_replyobjects_init
  38 #include "frescan_servers_replenishments.h" // frescan_replenishments_xxx
  39 #include "frescan_packets.h"
  40
  41 static int frescan_hook_frame_recv (const struct can_chip_t *chip,
  42                                     struct can_frame_t *frame);
  43
  44 static int frescan_hook_frame_sent(const struct can_chip_t *chip);
  45
  46 static int frescan_hook_frame_aborted(const struct can_chip_t *chip);
  47
  48 /**
  49  * frescan_init - initializes the network and the internal structures
  50  *
  51  * @params: the initialization parameters
  52  *
  53  * This function initializes the frescan network protocol.
  54  *
  55  * First it opens and configures the corresponding CAN chip device. For the
  56  * CAN chip acceptance filter we use a dual filter configuration. The first
  57  * filter is to set my local address address and the second one is to allow
  58  * broadcast messages.
  59  *
  60  * Once the CAN chip is configured we call the initialization functions of
  61  * the rest of modules of frescan.
  62  *
  63  */
  64
  65 int frescan_init(frescan_init_params_t *params)
  66 {
  67         int fd, ret;
  68         char can_path[PATH_MX];
  69         struct ioctl_filters_t ioctl_filters;
  70         struct can_filter_t filters[2];
  71
  72         snprintf(can_path, PATH_MX, "/dev/can%u", params->net);
  73
  74         DEBUG(FRESCAN_INIT_ENABLE_DEBUG, "open %s\n", can_path);
  75
  76         fd = open (can_path, O_RDWR);
  77         if (fd == -1) {
  78                 ERROR ("could not open /dev/can%u\n", params->net);
  79                 return -1;
  80         }
  81
  82         DEBUG(FRESCAN_INIT_ENABLE_DEBUG, "set acceptance filters\n");
  83
  84         filters[0].mask = 0xFFFFFFFF;
  85         frescan_id_set_field(&filters[0].mask, FRESCAN_FIELD_DEST,0x00);
  86         filters[0].code = 0;
  87         frescan_id_set_field(&filters[0].code, FRESCAN_FIELD_DEST,params->node);
  88
  89         filters[1].mask = filters[0].mask;
  90         filters[1].code = 0;
  91         frescan_id_set_field(&filters[1].code,
  92                              FRESCAN_FIELD_DEST,
  93                              FRESCAN_BROADCAST_ADDR);
  94
  95         ioctl_filters.filters = filters;
  96         ioctl_filters.len = 2;
  97
  98         ret = ioctl(fd, CAN_IOCTL_SET_FILTERS, &ioctl_filters);
  99         if (ret == -1) {
 100                 ERROR ("ioctl CAN_IOCTL_SET_FILTERS failed /dev/can%u\n",
 101                        params->net);
 102                 return -1;
 103         }
 104
 105         DEBUG(FRESCAN_INIT_ENABLE_DEBUG, "set tx, rx, abort hooks\n");
 106
 107         ret = ioctl(fd, CAN_IOCTL_SET_TX_HOOK, frescan_hook_frame_sent);
 108         if (ret == -1) {
 109                 ERROR ("ioctl CAN_IOCTL_SET_TX_HOOK failed /dev/can%u\n",
 110                        params->net);
 111                 return -1;
 112         }
 113
 114         ret = ioctl(fd, CAN_IOCTL_SET_RX_HOOK, frescan_hook_frame_recv);
 115         if (ret == -1) {
 116                 ERROR ("ioctl CAN_IOCTL_SET_RX_HOOK failed /dev/can%u\n",
 117                        params->net);
 118                 return -1;
 119         }
 120
 121         ret = ioctl(fd, CAN_IOCTL_SET_AB_HOOK, frescan_hook_frame_aborted);
 122         if (ret == -1) {
 123                 ERROR ("ioctl CAN_IOCTL_SET_AB_HOOK failed /dev/can%u\n",
 124                        params->net);
 125                 return -1;
 126         }
 127
 128         DEBUG(FRESCAN_INIT_ENABLE_DEBUG, "init the rest of modules\n");
 129
 130         ret = frescan_data_init(fd, params);
 131         if (ret != 0) {
 132                 ERROR("could not initialize the global data\n");
 133                 return -1;
 134         }
 135
 136         ret = frescan_packets_init();
 137         if (ret != 0) {
 138                 ERROR("could not initialize the packets pool\n");
 139                 return -1;
 140         }
 141
 142         ret = frescan_queues_init(&the_networks[params->net].queues, params);
 143         if (ret != 0) {
 144                 ERROR("could not initialize the queues\n");
 145                 return -1;
 146         }
 147
 148         ret = frescan_servers_init(params->net);
 149         if (ret != 0) {
 150                 ERROR("could not initialize the servers\n");
 151                 return -1;
 152         }
 153
 154         ret = frescan_replenishments_init(params->net);
 155         if (ret != 0) {
 156                 ERROR("could not initialize the replenishments\n");
 157                 return -1;
 158         }
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * frescan_send - send a message
 165  *
 166  * @params: the parameters needed by the protocol to send the message
 167  * @msg: the message buffer
 168  * @size: the size of the message
 169  *
 170  * This is one of the main functions of the protocol and it provides the
 171  * means to send a message through the protocol stack.
 172  */
 173
 174 int frescan_send(const frescan_send_params_t *params,
 175                  const uint8_t *msg,
 176                  const size_t size)
 177 {
 178         int ret;
 179         frescan_packet_t *packet;
 180         frescan_prio_queue_t *pqueue;
 181
 182         DEBUG(FRESCAN_SEND_ENABLE_DEBUG || FRESCAN_FRAG_ENABLE_DEBUG,
 183               "checking arguments (msg size=%d)\n", size);
 184
 185         if ((params == NULL) || (msg == NULL) || (size == 0)) {
 186                 ERROR("arguments are not ok\n");
 187                 return -1;
 188         }
 189
 190         DEBUG(FRESCAN_SEND_ENABLE_DEBUG, "allocating a packet\n");
 191
 192         FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 193         packet = frescan_packets_alloc();
 194         FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 195
 196         if (packet == NULL) {
 197                 ERROR("could not allocate packet\n");
 198                 return -1;
 199         }
 200         packet->flags = params->flags; // set the flags (to remember them)
 201
 202         DEBUG(FRESCAN_SEND_ENABLE_DEBUG, "allocating a frame\n");
 203
 204         FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 205         packet->frame = can_framespool_alloc();
 206         FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 207
 208         if (packet->frame == NULL) {
 209                 ERROR("could not allocate frame\n");
 210                 return -1;
 211         }
 212
 213         DEBUG(FRESCAN_SEND_ENABLE_DEBUG, "set values for the frame header\n");
 214         packet->frame->is_extended_format = true;
 215         packet->frame->is_rtr = false;
 216
 217         if (params->flags & FRESCAN_FP) {
 218                 // NOTE: frag id for fp is: FRESCAN_MX_IDS, so the servers can
 219                 // have IDs in the range (0 .. FRESCAN_MX_IDS-1)
 220                 frescan_id_set_field(&packet->frame->id,
 221                                      FRESCAN_FIELD_FRAG_ID,
 222                                      (uint32_t)FRESCAN_MX_IDS);
 223
 224                 frescan_id_set_field(&packet->frame->id,
 225                                       FRESCAN_FIELD_PRIO,
 226                                       (uint32_t)params->prio);
 227         } else {
 228                 // NOTE: the priority is put when the packet is dequeued
 229                 // and it is the priority of th server
 230                 frescan_id_set_field(&packet->frame->id,
 231                                      FRESCAN_FIELD_FRAG_ID,
 232                                      (uint32_t)params->ss);
 233         }
 234
 235         frescan_id_set_field(&packet->frame->id,
 236                              FRESCAN_FIELD_DEST,
 237                              (uint32_t)params->to);
 238
 239         frescan_id_set_field(&packet->frame->id,
 240                              FRESCAN_FIELD_SRC,
 241                              (uint32_t)the_networks[params->net].local_node);
 242
 243         frescan_id_set_field(&packet->frame->id,
 244                               FRESCAN_FIELD_CHAN,
 245                               (uint32_t)params->channel);
 246
 247         DEBUG(FRESCAN_SEND_ENABLE_DEBUG, "set the packet data bytes\n");
 248         if (params->flags & FRESCAN_ASYNC) {
 249                 // allocate a buffer and copy the data
 250                 // NOTE: instead of this we could use a chain of frames but
 251                 // i think it would be inefficient since each one can only
 252                 // hold 8 user bytes and we need to write its headers.
 253                 packet->buffer_head = (uint8_t *)malloc(size*sizeof(uint8_t));
 254                 memcpy(packet->buffer_head, msg, size);
 255         } else {
 256                 packet->buffer_head = (uint8_t *)msg;
 257         }
 258
 259         packet->buffer_read_pointer = packet->buffer_head;
 260         packet->buffer_pending_bytes = size;
 261         pqueue = the_networks[params->net].queues.tx_fp_queue;
 262
 263         DEBUG(FRESCAN_SEND_ENABLE_DEBUG, "enqueue the packet\n");
 264         if (packet->flags & FRESCAN_FP) {
 265                 FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 266                 ret = frescan_pqueue_enqueue(pqueue, packet, params->prio);
 267                 FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 268
 269                 if (ret != 0) {
 270                         ERROR("could not enqueue the packet\n");
 271                         return -1;
 272                 }
 273         } else {
 274                 FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 275                 ret = frescan_servers_enqueue(params->net, params->ss, packet);
 276                 FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 277
 278                 if (ret != 0) {
 279                         ERROR("could not enqueue the packet\n");
 280                         return -1;
 281                 }
 282         }
 283
 284         FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 285         ret = frescan_hw_buffer_update(params->net);
 286         FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 287
 288         if (ret != 0) {
 289                 ERROR("could not update hw buffer\n");
 290                 return -1;
 291         }
 292
 293         return 0;
 294 }
 295
 296 /**
 297  * frescan_recv - receive a message
 298  *
 299  * @params: the parameters needed by the protocol to receive the message
 300  * @msg: the message buffer
 301  * @size: the size of the message buffer
 302  * @recv_bytes: the number of bytes received
 303  * @from: the node that sent the message
 304  * @prio: the priority of the message
 305  *
 306  * This is one of the main functions of the protocol and it provides the
 307  * means to receive a message through the protocol stack.
 308  */
 309
 310 int frescan_recv(const frescan_recv_params_t *params,
 311                  uint8_t *msg,
 312                  const size_t size,
 313                  size_t *recv_bytes,
 314                  frescan_node_t *from,
 315                  frescan_prio_t *prio)
 316 {
 317         int ret;
 318         frescan_prio_queue_t *pqueue;
 319         bool blocking;
 320         frescan_packet_t *head, *packet;
 321
 322         if (params->flags & FRESCAN_SYNC) {
 323                 DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 324                       "receive a packet in blocking mode\n");
 325                 blocking = true;
 326         } else {
 327                 DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 328                       "receive a packet in non-blocking mode\n");
 329                 blocking = false;
 330         }
 331
 332         pqueue = the_networks[params->net].queues.rx_channel_queues
 333                                                              [params->channel];
 334
 335         ret = frescan_pqueue_dequeue(pqueue, &head, prio, blocking);
 336         if (ret != 0) {
 337                 ERROR ("could not dequeue packet\n");
 338                 return -1;
 339         }
 340
 341         if (head == NULL) {
 342                 if (blocking == false) {
 343                         DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 344                               "blocking false, no packets\n");
 345                         *recv_bytes = 0;
 346                         return 0;
 347                 } else {
 348                         ERROR ("blocking true, and packet = null\n");
 349                         return -1;
 350                 }
 351         }
 352
 353         DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 354               "traverse the list of packets for this message\n");
 355
 356         *recv_bytes = 0;
 357
 358         FRESCAN_ACQUIRE_LOCK(&the_networks[params->net].lock);
 359
 360         list_for_each_entry(packet, &head->msg_list, msg_list) {
 361                 // TODO: memory checks, delete the packets
 362                 memcpy(msg + *recv_bytes,
 363                        packet->frame->data,
 364                        packet->frame->dlc);
 365                 *recv_bytes += packet->frame->dlc;
 366
 367                 *from = (frescan_node_t)frescan_id_get_field(packet->frame->id,
 368                                                              FRESCAN_FIELD_SRC);
 369                 DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 370                       "ID Packet, dlc: %u, frame pool pos: %u, from:%u\n",
 371                       packet->frame->dlc, packet->frame->pool_pos, *from);
 372
 373                 ret = can_framespool_free(packet->frame);
 374                 if (ret != 0) {
 375                         ERROR("could not free frame\n");
 376                         return -1;
 377                 }
 378
 379                 ret = frescan_packets_free(packet);
 380                 if (ret != 0) {
 381                         ERROR("could not free packet\n");
 382                         return -1;
 383                 }
 384         }
 385
 386         ret = frescan_packets_free(head);
 387
 388         FRESCAN_RELEASE_LOCK(&the_networks[params->net].lock);
 389
 390         if (ret != 0) {
 391                 ERROR("could not free head packet\n");
 392                 return -1;
 393         }
 394
 395         DEBUG(FRESCAN_RECV_ENABLE_DEBUG,
 396               "received bytes: %u\n", *recv_bytes);
 397
 398         return 0;
 399 }
 400
 401
 402 /**
 403  * frescan_hook_frame_recv - frame received hook
 404  *
 405  * This function will be called by the CAN driver's IRQ handler when a frame
 406  * is received so we can store it in an appropiate queue.
 407  *
 408  * NOTE: in the future it could consist simply of signaling a semaphore to
 409  * let a bottom half thread do the hard work.
 410  */
 411
 412
 413 static int frescan_hook_frame_recv (const struct can_chip_t *chip,
 414                                     struct can_frame_t *frame)
 415 {
 416         int i, ret;
 417         uint32_t prio, dest, src, channel, frag_id, frag_flag;
 418         frescan_packet_t *packet, *head;
 419         frescan_prio_queue_t *pqueue;
 420         int net;
 421
 422         net = chip->minor;
 423
 424         DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG, "received a frame, net=%d\n", net);
 425         DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG || FRESCAN_FRAG_ENABLE_DEBUG,
 426               "%s %s, id=0x%X, dlc=%u, pool:%u\n",
 427               (frame->is_extended_format) ? "Ext" : "Stnd",
 428               (frame->is_rtr) ? "RTR Frame" : "DATA Frame",
 429               frame->id,
 430               frame->dlc,
 431               frame->pool_pos);
 432
 433         for (i=0; i<frame->dlc; i++) {
 434                 DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG,
 435                       "data[%d] = 0x%X;\n", i, frame->data[i]);
 436         }
 437
 438         prio      = frescan_id_get_field(frame->id, FRESCAN_FIELD_PRIO);
 439         dest      = frescan_id_get_field(frame->id, FRESCAN_FIELD_DEST);
 440         src       = frescan_id_get_field(frame->id, FRESCAN_FIELD_SRC);
 441         channel   = frescan_id_get_field(frame->id, FRESCAN_FIELD_CHAN);
 442         frag_id   = frescan_id_get_field(frame->id, FRESCAN_FIELD_FRAG_ID);
 443         frag_flag = frescan_id_get_field(frame->id, FRESCAN_FIELD_FRAG_FLAG);
 444
 445         DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG || FRESCAN_FRAG_ENABLE_DEBUG,
 446               "prio:%u dest:%u src:%u chan:%u id:%u flag:%u\n",
 447               prio, dest, src, channel, frag_id, frag_flag);
 448
 449         DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG,
 450               "enqueue the packet in ID queue\n");
 451         packet = frescan_packets_alloc();
 452         packet->frame = frame;
 453
 454         if (frag_id == 0) {
 455                 head = the_networks[net].id_fp_queues[prio];
 456         } else {
 457                 head = the_networks[net].id_queues[frag_id];
 458         }
 459
 460         if (head == NULL) {
 461                 DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG ||
 462                                 FRESCAN_FRAG_ENABLE_DEBUG,
 463                 "allocate head for id=%u\n", frag_id);
 464                 head = frescan_packets_alloc();
 465                 INIT_LIST_HEAD(&head->msg_list);
 466
 467                 if (frag_id == 0) {
 468                         the_networks[net].id_fp_queues[prio] = head;
 469                 } else {
 470                         the_networks[net].id_queues[frag_id] = head;
 471                 }
 472         }
 473
 474         list_add_tail(&packet->msg_list, &head->msg_list);
 475
 476         if (frag_flag == false) {
 477                 DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG ||
 478                                 FRESCAN_FRAG_ENABLE_DEBUG,
 479                 "message complete, move msg to channel\n");
 480                 // TODO: select the highest priority??
 481                 pqueue = the_networks[net].queues.rx_channel_queues[channel];
 482                 ret = frescan_pqueue_enqueue(pqueue, head, prio);
 483                 if (ret != 0) {
 484                         ERROR("could not enqueue message in channel queue\n");
 485                         return -1;
 486                 }
 487
 488                 if (frag_id == 0) {
 489                         the_networks[net].id_fp_queues[prio] = NULL;
 490                 } else {
 491                         the_networks[net].id_queues[frag_id] = NULL;
 492                 }
 493
 494         } else {
 495                 DEBUG(FRESCAN_RX_HOOK_ENABLE_DEBUG ||
 496                                 FRESCAN_FRAG_ENABLE_DEBUG,
 497                 "message not complete, wait for more fragments\n");
 498         }
 499
 500         // NOTE: don't forget to free the frame and the packet when it is
 501         // read by the user application
 502
 503         return 0;
 504 };
 505
 506 /**
 507  * frescan_hook_frame_sent - frame sent hook
 508  *
 509  * This function will be called by the CAN driver's IRQ handler when a frame
 510  * is sent through the CAN bus so we can enqueue another one, signal a
 511  * semaphore, consume sporadic server capacity...
 512  */
 513
 514 static int frescan_hook_frame_sent(const struct can_chip_t *chip)
 515 {
 516         int ret;
 517         frescan_packet_t *packet;
 518         frescan_prio_queue_t *pqueue;
 519         frescan_prio_t prio;
 520         frescan_ss_t id;
 521
 522         packet = the_networks[chip->minor].last_packet;
 523
 524         id = frescan_id_get_field(packet->frame->id,
 525                                   FRESCAN_FIELD_FRAG_ID);
 526
 527         DEBUG(FRESCAN_SENT_HOOK_ENABLE_DEBUG,
 528               "frame sent, minor:%u flags:0x%X frag_id:0x%X\n",
 529               chip->minor, packet->flags, id);
 530
 531         if (packet->flags & FRESCAN_SS) {
 532                 DEBUG(FRESCAN_SENT_HOOK_ENABLE_DEBUG,
 533                       "calling frame_sent + program repl for id:%u\n", id);
 534
 535                 ret = frescan_replenishment_program(chip->minor, id);
 536                 if (ret != 0) {
 537                         ERROR("could not program replenishment\n");
 538                         return -1;
 539                 }
 540
 541                 ret = frescan_servers_frame_sent(chip->minor, id);
 542                 if (ret != 0) {
 543                         ERROR("could not let the server a frame was sent\n");
 544                         return -1;
 545                 }
 546         }
 547
 548         DEBUG(FRESCAN_SENT_HOOK_ENABLE_DEBUG || FRESCAN_FRAG_ENABLE_DEBUG,
 549               "last packet buffer_pending_bytes=%u\n",
 550               packet->buffer_pending_bytes);
 551
 552         if (packet->buffer_pending_bytes > 0) {
 553                 if (packet->flags & FRESCAN_FP) {
 554                         prio = frescan_id_get_field(packet->frame->id,
 555                                         FRESCAN_FIELD_PRIO);
 556
 557                         DEBUG(FRESCAN_FRAG_ENABLE_DEBUG,
 558                               "requeue fp packet, prio:%u\n", prio);
 559
 560                         pqueue = the_networks[chip->minor].queues.tx_fp_queue;
 561                         ret = frescan_pqueue_requeue(pqueue, packet, prio);
 562                         if (ret != 0) {
 563                                 ERROR("could not requeue the packet\n");
 564                                 return -1;
 565                         }
 566                 } else if (packet->flags & FRESCAN_SS) {
 567                         DEBUG(FRESCAN_FRAG_ENABLE_DEBUG,
 568                               "requeue server %u packet\n", id);
 569                         ret = frescan_servers_requeue(chip->minor, id, packet);
 570                         if (ret != 0) {
 571                                 ERROR("could not requeue the packet\n");
 572                                 return -1;
 573                         }
 574                 } else {
 575                         ERROR("flags are not correct\n");
 576                         return -1;
 577                 }
 578         } else {
 579                 DEBUG(FRESCAN_FRAG_ENABLE_DEBUG,
 580                       "all packet fragmets sent, freeing the packet\n");
 581
 582                 ret = can_framespool_free(packet->frame);
 583                 if (ret != 0)  {
 584                         ERROR ("could not free the frame\n");
 585                         return ret;
 586                 }
 587
 588                 ret = frescan_packets_free(packet);
 589                 if (ret != 0)  {
 590                         ERROR ("could not free the packet\n");
 591                         return ret;
 592                 }
 593
 594                 // TODO: signal semaphore for send_sync
 595         }
 596
 597         the_networks[chip->minor].last_packet = NULL;
 598
 599         ret = frescan_hw_buffer_update(chip->minor);
 600         if (ret != 0) {
 601                 ERROR("could not update hw buffer\n");
 602                 return -1;
 603         }
 604
 605         return 0;
 606 };
 607
 608 /**
 609  * frescan_hook_frame_aborted - frame frame aborted hook
 610  *
 611  * This function will be called by the CAN driver's IRQ handler when a frame
 612  * is aborted (because another frame with higher priority is waiting). We
 613  * have to requeue the frame and update the buffer.
 614  */
 615
 616 static int frescan_hook_frame_aborted(const struct can_chip_t *chip)
 617 {
 618         int ret;
 619         frescan_packet_t *packet;
 620         frescan_prio_queue_t *pqueue;
 621         frescan_prio_t prio;
 622         frescan_ss_t id;
 623
 624         packet = the_networks[chip->minor].last_packet;
 625
 626         id = frescan_id_get_field(packet->frame->id,
 627                                   FRESCAN_FIELD_FRAG_ID);
 628
 629         DEBUG(FRESCAN_SENT_HOOK_ENABLE_DEBUG,
 630               "frame aborted, minor:%u flags:0x%X frag_id:0x%X\n",
 631               chip->minor, packet->flags, id);
 632
 633         if (packet->flags & FRESCAN_FP) {
 634                 prio = frescan_id_get_field(packet->frame->id,
 635                                             FRESCAN_FIELD_PRIO);
 636
 637                 DEBUG(FRESCAN_FRAG_ENABLE_DEBUG,
 638                       "requeue fp packet, prio:%u\n", prio);
 639
 640                 pqueue = the_networks[chip->minor].queues.tx_fp_queue;
 641                 ret = frescan_pqueue_requeue(pqueue, packet, prio);
 642                 if (ret != 0) {
 643                         ERROR("could not requeue the packet\n");
 644                         return -1;
 645                 }
 646         } else if (packet->flags & FRESCAN_SS) {
 647                 DEBUG(FRESCAN_FRAG_ENABLE_DEBUG,
 648                       "requeue server %u packet\n", id);
 649
 650                 ret = frescan_servers_requeue(chip->minor, id, packet);
 651                 if (ret != 0) {
 652                         ERROR("could not requeue the packet\n");
 653                         return -1;
 654                 }
 655         } else {
 656                 ERROR("flags are not correct\n");
 657                 return -1;
 658         }
 659
 660         the_networks[chip->minor].last_packet = NULL;
 661
 662         ret = frescan_hw_buffer_update(chip->minor);
 663         if (ret != 0) {
 664                 ERROR("could not update hw buffer\n");
 665                 return -1;
 666         }
 667
 668         return 0;
 669 }