err.no Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00queue.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 queue specific routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #include "rt2x00.h"
  31 #include "rt2x00lib.h"
  32
  33 struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
  34                                         struct queue_entry *entry)
  35 {
  36         unsigned int frame_size;
  37         unsigned int reserved_size;
  38         struct sk_buff *skb;
  39         struct skb_frame_desc *skbdesc;
  40
  41         /*
  42          * The frame size includes descriptor size, because the
  43          * hardware directly receive the frame into the skbuffer.
  44          */
  45         frame_size = entry->queue->data_size + entry->queue->desc_size;
  46
  47         /*
  48          * Reserve a few bytes extra headroom to allow drivers some moving
  49          * space (e.g. for alignment), while keeping the skb aligned.
  50          */
  51         reserved_size = 8;
  52
  53         /*
  54          * Allocate skbuffer.
  55          */
  56         skb = dev_alloc_skb(frame_size + reserved_size);
  57         if (!skb)
  58                 return NULL;
  59
  60         skb_reserve(skb, reserved_size);
  61         skb_put(skb, frame_size);
  62
  63         /*
  64          * Populate skbdesc.
  65          */
  66         skbdesc = get_skb_frame_desc(skb);
  67         memset(skbdesc, 0, sizeof(*skbdesc));
  68         skbdesc->entry = entry;
  69
  70         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
  71                 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
  72                                                   skb->data,
  73                                                   skb->len,
  74                                                   DMA_FROM_DEVICE);
  75                 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
  76         }
  77
  78         return skb;
  79 }
  80 EXPORT_SYMBOL_GPL(rt2x00queue_alloc_rxskb);
  81
  82 void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
  83 {
  84         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
  85
  86         skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len,
  87                                           DMA_TO_DEVICE);
  88         skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
  89 }
  90 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
  91
  92 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
  93 {
  94         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
  95
  96         if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
  97                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
  98                                  DMA_FROM_DEVICE);
  99                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
 100         }
 101
 102         if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
 103                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
 104                                  DMA_TO_DEVICE);
 105                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
 106         }
 107 }
 108 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
 109
 110 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 111 {
 112         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 113
 114         if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
 115                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
 116                                  DMA_FROM_DEVICE);
 117         }
 118
 119         if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
 120                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
 121                                  DMA_TO_DEVICE);
 122         }
 123
 124         dev_kfree_skb_any(skb);
 125 }
 126 EXPORT_SYMBOL_GPL(rt2x00queue_free_skb);
 127
 128 void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 129                                       struct txentry_desc *txdesc)
 130 {
 131         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 132         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 133         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 134         struct ieee80211_rate *rate =
 135             ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
 136         const struct rt2x00_rate *hwrate;
 137         unsigned int data_length;
 138         unsigned int duration;
 139         unsigned int residual;
 140
 141         memset(txdesc, 0, sizeof(*txdesc));
 142
 143         /*
 144          * Initialize information from queue
 145          */
 146         txdesc->queue = entry->queue->qid;
 147         txdesc->cw_min = entry->queue->cw_min;
 148         txdesc->cw_max = entry->queue->cw_max;
 149         txdesc->aifs = entry->queue->aifs;
 150
 151         /* Data length should be extended with 4 bytes for CRC */
 152         data_length = entry->skb->len + 4;
 153
 154         /*
 155          * Check whether this frame is to be acked.
 156          */
 157         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 158                 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 159
 160         /*
 161          * Check if this is a RTS/CTS frame
 162          */
 163         if (ieee80211_is_rts(hdr->frame_control) ||
 164             ieee80211_is_cts(hdr->frame_control)) {
 165                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 166                 if (ieee80211_is_rts(hdr->frame_control))
 167                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
 168                 else
 169                         __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
 170                 if (tx_info->control.rts_cts_rate_idx >= 0)
 171                         rate =
 172                             ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
 173         }
 174
 175         /*
 176          * Determine retry information.
 177          */
 178         txdesc->retry_limit = tx_info->control.retry_limit;
 179         if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
 180                 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
 181
 182         /*
 183          * Check if more fragments are pending
 184          */
 185         if (ieee80211_has_morefrags(hdr->frame_control)) {
 186                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 187                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
 188         }
 189
 190         /*
 191          * Beacons and probe responses require the tsf timestamp
 192          * to be inserted into the frame.
 193          */
 194         if (ieee80211_is_beacon(hdr->frame_control) ||
 195             ieee80211_is_probe_resp(hdr->frame_control))
 196                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
 197
 198         /*
 199          * Determine with what IFS priority this frame should be send.
 200          * Set ifs to IFS_SIFS when the this is not the first fragment,
 201          * or this fragment came after RTS/CTS.
 202          */
 203         if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
 204                 txdesc->ifs = IFS_SIFS;
 205         } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
 206                 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
 207                 txdesc->ifs = IFS_BACKOFF;
 208         } else {
 209                 txdesc->ifs = IFS_SIFS;
 210         }
 211
 212         /*
 213          * PLCP setup
 214          * Length calculation depends on OFDM/CCK rate.
 215          */
 216         hwrate = rt2x00_get_rate(rate->hw_value);
 217         txdesc->signal = hwrate->plcp;
 218         txdesc->service = 0x04;
 219
 220         if (hwrate->flags & DEV_RATE_OFDM) {
 221                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags);
 222
 223                 txdesc->length_high = (data_length >> 6) & 0x3f;
 224                 txdesc->length_low = data_length & 0x3f;
 225         } else {
 226                 /*
 227                  * Convert length to microseconds.
 228                  */
 229                 residual = get_duration_res(data_length, hwrate->bitrate);
 230                 duration = get_duration(data_length, hwrate->bitrate);
 231
 232                 if (residual != 0) {
 233                         duration++;
 234
 235                         /*
 236                          * Check if we need to set the Length Extension
 237                          */
 238                         if (hwrate->bitrate == 110 && residual <= 30)
 239                                 txdesc->service |= 0x80;
 240                 }
 241
 242                 txdesc->length_high = (duration >> 8) & 0xff;
 243                 txdesc->length_low = duration & 0xff;
 244
 245                 /*
 246                  * When preamble is enabled we should set the
 247                  * preamble bit for the signal.
 248                  */
 249                 if (rt2x00_get_rate_preamble(rate->hw_value))
 250                         txdesc->signal |= 0x08;
 251         }
 252 }
 253 EXPORT_SYMBOL_GPL(rt2x00queue_create_tx_descriptor);
 254
 255 void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
 256                                      struct txentry_desc *txdesc)
 257 {
 258         struct data_queue *queue = entry->queue;
 259         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 260
 261         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
 262
 263         /*
 264          * All processing on the frame has been completed, this means
 265          * it is now ready to be dumped to userspace through debugfs.
 266          */
 267         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
 268
 269         /*
 270          * Check if we need to kick the queue, there are however a few rules
 271          *      1) Don't kick beacon queue
 272          *      2) Don't kick unless this is the last in frame in a burst.
 273          *         When the burst flag is set, this frame is always followed
 274          *         by another frame which in some way are related to eachother.
 275          *         This is true for fragments, RTS or CTS-to-self frames.
 276          *      3) Rule 2 can be broken when the available entries
 277          *         in the queue are less then a certain threshold.
 278          */
 279         if (entry->queue->qid == QID_BEACON)
 280                 return;
 281
 282         if (rt2x00queue_threshold(queue) ||
 283             !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
 284                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
 285 }
 286 EXPORT_SYMBOL_GPL(rt2x00queue_write_tx_descriptor);
 287
 288 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 289 {
 290         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 291         struct txentry_desc txdesc;
 292
 293         if (unlikely(rt2x00queue_full(queue)))
 294                 return -EINVAL;
 295
 296         if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 297                 ERROR(queue->rt2x00dev,
 298                       "Arrived at non-free entry in the non-full queue %d.\n"
 299                       "Please file bug report to %s.\n",
 300                       queue->qid, DRV_PROJECT);
 301                 return -EINVAL;
 302         }
 303
 304         /*
 305          * Copy all TX descriptor information into txdesc,
 306          * after that we are free to use the skb->cb array
 307          * for our information.
 308          */
 309         entry->skb = skb;
 310         rt2x00queue_create_tx_descriptor(entry, &txdesc);
 311
 312         if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
 313                 __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 314                 return -EIO;
 315         }
 316
 317         __set_bit(ENTRY_DATA_PENDING, &entry->flags);
 318
 319         rt2x00queue_index_inc(queue, Q_INDEX);
 320         rt2x00queue_write_tx_descriptor(entry, &txdesc);
 321
 322         return 0;
 323 }
 324
 325 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
 326                                          const enum data_queue_qid queue)
 327 {
 328         int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 329
 330         if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
 331                 return &rt2x00dev->tx[queue];
 332
 333         if (!rt2x00dev->bcn)
 334                 return NULL;
 335
 336         if (queue == QID_BEACON)
 337                 return &rt2x00dev->bcn[0];
 338         else if (queue == QID_ATIM && atim)
 339                 return &rt2x00dev->bcn[1];
 340
 341         return NULL;
 342 }
 343 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
 344
 345 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
 346                                           enum queue_index index)
 347 {
 348         struct queue_entry *entry;
 349         unsigned long irqflags;
 350
 351         if (unlikely(index >= Q_INDEX_MAX)) {
 352                 ERROR(queue->rt2x00dev,
 353                       "Entry requested from invalid index type (%d)\n", index);
 354                 return NULL;
 355         }
 356
 357         spin_lock_irqsave(&queue->lock, irqflags);
 358
 359         entry = &queue->entries[queue->index[index]];
 360
 361         spin_unlock_irqrestore(&queue->lock, irqflags);
 362
 363         return entry;
 364 }
 365 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
 366
 367 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
 368 {
 369         unsigned long irqflags;
 370
 371         if (unlikely(index >= Q_INDEX_MAX)) {
 372                 ERROR(queue->rt2x00dev,
 373                       "Index change on invalid index type (%d)\n", index);
 374                 return;
 375         }
 376
 377         spin_lock_irqsave(&queue->lock, irqflags);
 378
 379         queue->index[index]++;
 380         if (queue->index[index] >= queue->limit)
 381                 queue->index[index] = 0;
 382
 383         if (index == Q_INDEX) {
 384                 queue->length++;
 385         } else if (index == Q_INDEX_DONE) {
 386                 queue->length--;
 387                 queue->count ++;
 388         }
 389
 390         spin_unlock_irqrestore(&queue->lock, irqflags);
 391 }
 392 EXPORT_SYMBOL_GPL(rt2x00queue_index_inc);
 393
 394 static void rt2x00queue_reset(struct data_queue *queue)
 395 {
 396         unsigned long irqflags;
 397
 398         spin_lock_irqsave(&queue->lock, irqflags);
 399
 400         queue->count = 0;
 401         queue->length = 0;
 402         memset(queue->index, 0, sizeof(queue->index));
 403
 404         spin_unlock_irqrestore(&queue->lock, irqflags);
 405 }
 406
 407 void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
 408 {
 409         struct data_queue *queue = rt2x00dev->rx;
 410         unsigned int i;
 411
 412         rt2x00queue_reset(queue);
 413
 414         if (!rt2x00dev->ops->lib->init_rxentry)
 415                 return;
 416
 417         for (i = 0; i < queue->limit; i++)
 418                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
 419                                                   &queue->entries[i]);
 420 }
 421
 422 void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
 423 {
 424         struct data_queue *queue;
 425         unsigned int i;
 426
 427         txall_queue_for_each(rt2x00dev, queue) {
 428                 rt2x00queue_reset(queue);
 429
 430                 if (!rt2x00dev->ops->lib->init_txentry)
 431                         continue;
 432
 433                 for (i = 0; i < queue->limit; i++)
 434                         rt2x00dev->ops->lib->init_txentry(rt2x00dev,
 435                                                           &queue->entries[i]);
 436         }
 437 }
 438
 439 static int rt2x00queue_alloc_entries(struct data_queue *queue,
 440                                      const struct data_queue_desc *qdesc)
 441 {
 442         struct queue_entry *entries;
 443         unsigned int entry_size;
 444         unsigned int i;
 445
 446         rt2x00queue_reset(queue);
 447
 448         queue->limit = qdesc->entry_num;
 449         queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
 450         queue->data_size = qdesc->data_size;
 451         queue->desc_size = qdesc->desc_size;
 452
 453         /*
 454          * Allocate all queue entries.
 455          */
 456         entry_size = sizeof(*entries) + qdesc->priv_size;
 457         entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
 458         if (!entries)
 459                 return -ENOMEM;
 460
 461 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
 462         ( ((char *)(__base)) + ((__limit) * (__esize)) + \
 463             ((__index) * (__psize)) )
 464
 465         for (i = 0; i < queue->limit; i++) {
 466                 entries[i].flags = 0;
 467                 entries[i].queue = queue;
 468                 entries[i].skb = NULL;
 469                 entries[i].entry_idx = i;
 470                 entries[i].priv_data =
 471                     QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
 472                                             sizeof(*entries), qdesc->priv_size);
 473         }
 474
 475 #undef QUEUE_ENTRY_PRIV_OFFSET
 476
 477         queue->entries = entries;
 478
 479         return 0;
 480 }
 481
 482 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
 483                                   struct data_queue *queue)
 484 {
 485         unsigned int i;
 486
 487         if (!queue->entries)
 488                 return;
 489
 490         for (i = 0; i < queue->limit; i++) {
 491                 if (queue->entries[i].skb)
 492                         rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
 493         }
 494 }
 495
 496 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
 497                                     struct data_queue *queue)
 498 {
 499         unsigned int i;
 500         struct sk_buff *skb;
 501
 502         for (i = 0; i < queue->limit; i++) {
 503                 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
 504                 if (!skb)
 505                         goto exit;
 506                 queue->entries[i].skb = skb;
 507         }
 508
 509         return 0;
 510
 511 exit:
 512         rt2x00queue_free_skbs(rt2x00dev, queue);
 513
 514         return -ENOMEM;
 515 }
 516
 517 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
 518 {
 519         struct data_queue *queue;
 520         int status;
 521
 522         status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
 523         if (status)
 524                 goto exit;
 525
 526         tx_queue_for_each(rt2x00dev, queue) {
 527                 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
 528                 if (status)
 529                         goto exit;
 530         }
 531
 532         status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
 533         if (status)
 534                 goto exit;
 535
 536         if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
 537                 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
 538                                                    rt2x00dev->ops->atim);
 539                 if (status)
 540                         goto exit;
 541         }
 542
 543         status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
 544         if (status)
 545                 goto exit;
 546
 547         return 0;
 548
 549 exit:
 550         ERROR(rt2x00dev, "Queue entries allocation failed.\n");
 551
 552         rt2x00queue_uninitialize(rt2x00dev);
 553
 554         return status;
 555 }
 556
 557 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
 558 {
 559         struct data_queue *queue;
 560
 561         rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
 562
 563         queue_for_each(rt2x00dev, queue) {
 564                 kfree(queue->entries);
 565                 queue->entries = NULL;
 566         }
 567 }
 568
 569 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 570                              struct data_queue *queue, enum data_queue_qid qid)
 571 {
 572         spin_lock_init(&queue->lock);
 573
 574         queue->rt2x00dev = rt2x00dev;
 575         queue->qid = qid;
 576         queue->aifs = 2;
 577         queue->cw_min = 5;
 578         queue->cw_max = 10;
 579 }
 580
 581 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
 582 {
 583         struct data_queue *queue;
 584         enum data_queue_qid qid;
 585         unsigned int req_atim =
 586             !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 587
 588         /*
 589          * We need the following queues:
 590          * RX: 1
 591          * TX: ops->tx_queues
 592          * Beacon: 1
 593          * Atim: 1 (if required)
 594          */
 595         rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
 596
 597         queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
 598         if (!queue) {
 599                 ERROR(rt2x00dev, "Queue allocation failed.\n");
 600                 return -ENOMEM;
 601         }
 602
 603         /*
 604          * Initialize pointers
 605          */
 606         rt2x00dev->rx = queue;
 607         rt2x00dev->tx = &queue[1];
 608         rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
 609
 610         /*
 611          * Initialize queue parameters.
 612          * RX: qid = QID_RX
 613          * TX: qid = QID_AC_BE + index
 614          * TX: cw_min: 2^5 = 32.
 615          * TX: cw_max: 2^10 = 1024.
 616          * BCN: qid = QID_BEACON
 617          * ATIM: qid = QID_ATIM
 618          */
 619         rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
 620
 621         qid = QID_AC_BE;
 622         tx_queue_for_each(rt2x00dev, queue)
 623                 rt2x00queue_init(rt2x00dev, queue, qid++);
 624
 625         rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
 626         if (req_atim)
 627                 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
 628
 629         return 0;
 630 }
 631
 632 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
 633 {
 634         kfree(rt2x00dev->rx);
 635         rt2x00dev->rx = NULL;
 636         rt2x00dev->tx = NULL;
 637         rt2x00dev->bcn = NULL;
 638 }