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          * The payload should be aligned to a 4-byte boundary,
  49          * this means we need at least 3 bytes for moving the frame
  50          * into the correct offset.
  51          */
  52         reserved_size = 4;
  53
  54         /*
  55          * Allocate skbuffer.
  56          */
  57         skb = dev_alloc_skb(frame_size + reserved_size);
  58         if (!skb)
  59                 return NULL;
  60
  61         skb_reserve(skb, reserved_size);
  62         skb_put(skb, frame_size);
  63
  64         /*
  65          * Populate skbdesc.
  66          */
  67         skbdesc = get_skb_frame_desc(skb);
  68         memset(skbdesc, 0, sizeof(*skbdesc));
  69         skbdesc->entry = entry;
  70
  71         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
  72                 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
  73                                                   skb->data,
  74                                                   skb->len,
  75                                                   DMA_FROM_DEVICE);
  76                 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
  77         }
  78
  79         return skb;
  80 }
  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
 109 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 110 {
 111         if (!skb)
 112                 return;
 113
 114         rt2x00queue_unmap_skb(rt2x00dev, skb);
 115         dev_kfree_skb_any(skb);
 116 }
 117
 118 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 119                                              struct txentry_desc *txdesc)
 120 {
 121         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 122         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 123         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 124         struct ieee80211_rate *rate =
 125             ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
 126         const struct rt2x00_rate *hwrate;
 127         unsigned int data_length;
 128         unsigned int duration;
 129         unsigned int residual;
 130
 131         memset(txdesc, 0, sizeof(*txdesc));
 132
 133         /*
 134          * Initialize information from queue
 135          */
 136         txdesc->queue = entry->queue->qid;
 137         txdesc->cw_min = entry->queue->cw_min;
 138         txdesc->cw_max = entry->queue->cw_max;
 139         txdesc->aifs = entry->queue->aifs;
 140
 141         /* Data length should be extended with 4 bytes for CRC */
 142         data_length = entry->skb->len + 4;
 143
 144         /*
 145          * Check whether this frame is to be acked.
 146          */
 147         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 148                 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 149
 150         /*
 151          * Check if this is a RTS/CTS frame
 152          */
 153         if (ieee80211_is_rts(hdr->frame_control) ||
 154             ieee80211_is_cts(hdr->frame_control)) {
 155                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 156                 if (ieee80211_is_rts(hdr->frame_control))
 157                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
 158                 else
 159                         __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
 160                 if (tx_info->control.rts_cts_rate_idx >= 0)
 161                         rate =
 162                             ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
 163         }
 164
 165         /*
 166          * Determine retry information.
 167          */
 168         txdesc->retry_limit = tx_info->control.retry_limit;
 169         if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
 170                 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
 171
 172         /*
 173          * Check if more fragments are pending
 174          */
 175         if (ieee80211_has_morefrags(hdr->frame_control)) {
 176                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 177                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
 178         }
 179
 180         /*
 181          * Beacons and probe responses require the tsf timestamp
 182          * to be inserted into the frame.
 183          */
 184         if (ieee80211_is_beacon(hdr->frame_control) ||
 185             ieee80211_is_probe_resp(hdr->frame_control))
 186                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
 187
 188         /*
 189          * Determine with what IFS priority this frame should be send.
 190          * Set ifs to IFS_SIFS when the this is not the first fragment,
 191          * or this fragment came after RTS/CTS.
 192          */
 193         if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
 194                 txdesc->ifs = IFS_SIFS;
 195         } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
 196                 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
 197                 txdesc->ifs = IFS_BACKOFF;
 198         } else {
 199                 txdesc->ifs = IFS_SIFS;
 200         }
 201
 202         /*
 203          * PLCP setup
 204          * Length calculation depends on OFDM/CCK rate.
 205          */
 206         hwrate = rt2x00_get_rate(rate->hw_value);
 207         txdesc->signal = hwrate->plcp;
 208         txdesc->service = 0x04;
 209
 210         if (hwrate->flags & DEV_RATE_OFDM) {
 211                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags);
 212
 213                 txdesc->length_high = (data_length >> 6) & 0x3f;
 214                 txdesc->length_low = data_length & 0x3f;
 215         } else {
 216                 /*
 217                  * Convert length to microseconds.
 218                  */
 219                 residual = get_duration_res(data_length, hwrate->bitrate);
 220                 duration = get_duration(data_length, hwrate->bitrate);
 221
 222                 if (residual != 0) {
 223                         duration++;
 224
 225                         /*
 226                          * Check if we need to set the Length Extension
 227                          */
 228                         if (hwrate->bitrate == 110 && residual <= 30)
 229                                 txdesc->service |= 0x80;
 230                 }
 231
 232                 txdesc->length_high = (duration >> 8) & 0xff;
 233                 txdesc->length_low = duration & 0xff;
 234
 235                 /*
 236                  * When preamble is enabled we should set the
 237                  * preamble bit for the signal.
 238                  */
 239                 if (rt2x00_get_rate_preamble(rate->hw_value))
 240                         txdesc->signal |= 0x08;
 241         }
 242 }
 243
 244 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
 245                                             struct txentry_desc *txdesc)
 246 {
 247         struct data_queue *queue = entry->queue;
 248         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 249
 250         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
 251
 252         /*
 253          * All processing on the frame has been completed, this means
 254          * it is now ready to be dumped to userspace through debugfs.
 255          */
 256         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
 257
 258         /*
 259          * Check if we need to kick the queue, there are however a few rules
 260          *      1) Don't kick beacon queue
 261          *      2) Don't kick unless this is the last in frame in a burst.
 262          *         When the burst flag is set, this frame is always followed
 263          *         by another frame which in some way are related to eachother.
 264          *         This is true for fragments, RTS or CTS-to-self frames.
 265          *      3) Rule 2 can be broken when the available entries
 266          *         in the queue are less then a certain threshold.
 267          */
 268         if (entry->queue->qid == QID_BEACON)
 269                 return;
 270
 271         if (rt2x00queue_threshold(queue) ||
 272             !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
 273                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
 274 }
 275
 276 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 277 {
 278         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 279         struct txentry_desc txdesc;
 280         struct skb_frame_desc *skbdesc;
 281
 282         if (unlikely(rt2x00queue_full(queue)))
 283                 return -EINVAL;
 284
 285         if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 286                 ERROR(queue->rt2x00dev,
 287                       "Arrived at non-free entry in the non-full queue %d.\n"
 288                       "Please file bug report to %s.\n",
 289                       queue->qid, DRV_PROJECT);
 290                 return -EINVAL;
 291         }
 292
 293         /*
 294          * Copy all TX descriptor information into txdesc,
 295          * after that we are free to use the skb->cb array
 296          * for our information.
 297          */
 298         entry->skb = skb;
 299         rt2x00queue_create_tx_descriptor(entry, &txdesc);
 300
 301         /*
 302          * skb->cb array is now ours and we are free to use it.
 303          */
 304         skbdesc = get_skb_frame_desc(entry->skb);
 305         memset(skbdesc, 0, sizeof(*skbdesc));
 306         skbdesc->entry = entry;
 307
 308         if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
 309                 __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 310                 return -EIO;
 311         }
 312
 313         if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
 314                 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
 315
 316         __set_bit(ENTRY_DATA_PENDING, &entry->flags);
 317
 318         rt2x00queue_index_inc(queue, Q_INDEX);
 319         rt2x00queue_write_tx_descriptor(entry, &txdesc);
 320
 321         return 0;
 322 }
 323
 324 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
 325                               struct ieee80211_vif *vif)
 326 {
 327         struct rt2x00_intf *intf = vif_to_intf(vif);
 328         struct skb_frame_desc *skbdesc;
 329         struct txentry_desc txdesc;
 330         __le32 desc[16];
 331
 332         if (unlikely(!intf->beacon))
 333                 return -ENOBUFS;
 334
 335         intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 336         if (!intf->beacon->skb)
 337                 return -ENOMEM;
 338
 339         /*
 340          * Copy all TX descriptor information into txdesc,
 341          * after that we are free to use the skb->cb array
 342          * for our information.
 343          */
 344         rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
 345
 346         /*
 347          * For the descriptor we use a local array from where the
 348          * driver can move it to the correct location required for
 349          * the hardware.
 350          */
 351         memset(desc, 0, sizeof(desc));
 352
 353         /*
 354          * Fill in skb descriptor
 355          */
 356         skbdesc = get_skb_frame_desc(intf->beacon->skb);
 357         memset(skbdesc, 0, sizeof(*skbdesc));
 358         skbdesc->desc = desc;
 359         skbdesc->desc_len = intf->beacon->queue->desc_size;
 360         skbdesc->entry = intf->beacon;
 361
 362         /*
 363          * Write TX descriptor into reserved room in front of the beacon.
 364          */
 365         rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
 366
 367         /*
 368          * Send beacon to hardware.
 369          * Also enable beacon generation, which might have been disabled
 370          * by the driver during the config_beacon() callback function.
 371          */
 372         rt2x00dev->ops->lib->write_beacon(intf->beacon);
 373         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
 374
 375         return 0;
 376 }
 377
 378 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
 379                                          const enum data_queue_qid queue)
 380 {
 381         int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 382
 383         if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
 384                 return &rt2x00dev->tx[queue];
 385
 386         if (!rt2x00dev->bcn)
 387                 return NULL;
 388
 389         if (queue == QID_BEACON)
 390                 return &rt2x00dev->bcn[0];
 391         else if (queue == QID_ATIM && atim)
 392                 return &rt2x00dev->bcn[1];
 393
 394         return NULL;
 395 }
 396 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
 397
 398 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
 399                                           enum queue_index index)
 400 {
 401         struct queue_entry *entry;
 402         unsigned long irqflags;
 403
 404         if (unlikely(index >= Q_INDEX_MAX)) {
 405                 ERROR(queue->rt2x00dev,
 406                       "Entry requested from invalid index type (%d)\n", index);
 407                 return NULL;
 408         }
 409
 410         spin_lock_irqsave(&queue->lock, irqflags);
 411
 412         entry = &queue->entries[queue->index[index]];
 413
 414         spin_unlock_irqrestore(&queue->lock, irqflags);
 415
 416         return entry;
 417 }
 418 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
 419
 420 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
 421 {
 422         unsigned long irqflags;
 423
 424         if (unlikely(index >= Q_INDEX_MAX)) {
 425                 ERROR(queue->rt2x00dev,
 426                       "Index change on invalid index type (%d)\n", index);
 427                 return;
 428         }
 429
 430         spin_lock_irqsave(&queue->lock, irqflags);
 431
 432         queue->index[index]++;
 433         if (queue->index[index] >= queue->limit)
 434                 queue->index[index] = 0;
 435
 436         if (index == Q_INDEX) {
 437                 queue->length++;
 438         } else if (index == Q_INDEX_DONE) {
 439                 queue->length--;
 440                 queue->count ++;
 441         }
 442
 443         spin_unlock_irqrestore(&queue->lock, irqflags);
 444 }
 445
 446 static void rt2x00queue_reset(struct data_queue *queue)
 447 {
 448         unsigned long irqflags;
 449
 450         spin_lock_irqsave(&queue->lock, irqflags);
 451
 452         queue->count = 0;
 453         queue->length = 0;
 454         memset(queue->index, 0, sizeof(queue->index));
 455
 456         spin_unlock_irqrestore(&queue->lock, irqflags);
 457 }
 458
 459 void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
 460 {
 461         struct data_queue *queue = rt2x00dev->rx;
 462         unsigned int i;
 463
 464         rt2x00queue_reset(queue);
 465
 466         if (!rt2x00dev->ops->lib->init_rxentry)
 467                 return;
 468
 469         for (i = 0; i < queue->limit; i++)
 470                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
 471                                                   &queue->entries[i]);
 472 }
 473
 474 void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
 475 {
 476         struct data_queue *queue;
 477         unsigned int i;
 478
 479         txall_queue_for_each(rt2x00dev, queue) {
 480                 rt2x00queue_reset(queue);
 481
 482                 if (!rt2x00dev->ops->lib->init_txentry)
 483                         continue;
 484
 485                 for (i = 0; i < queue->limit; i++)
 486                         rt2x00dev->ops->lib->init_txentry(rt2x00dev,
 487                                                           &queue->entries[i]);
 488         }
 489 }
 490
 491 static int rt2x00queue_alloc_entries(struct data_queue *queue,
 492                                      const struct data_queue_desc *qdesc)
 493 {
 494         struct queue_entry *entries;
 495         unsigned int entry_size;
 496         unsigned int i;
 497
 498         rt2x00queue_reset(queue);
 499
 500         queue->limit = qdesc->entry_num;
 501         queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
 502         queue->data_size = qdesc->data_size;
 503         queue->desc_size = qdesc->desc_size;
 504
 505         /*
 506          * Allocate all queue entries.
 507          */
 508         entry_size = sizeof(*entries) + qdesc->priv_size;
 509         entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
 510         if (!entries)
 511                 return -ENOMEM;
 512
 513 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
 514         ( ((char *)(__base)) + ((__limit) * (__esize)) + \
 515             ((__index) * (__psize)) )
 516
 517         for (i = 0; i < queue->limit; i++) {
 518                 entries[i].flags = 0;
 519                 entries[i].queue = queue;
 520                 entries[i].skb = NULL;
 521                 entries[i].entry_idx = i;
 522                 entries[i].priv_data =
 523                     QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
 524                                             sizeof(*entries), qdesc->priv_size);
 525         }
 526
 527 #undef QUEUE_ENTRY_PRIV_OFFSET
 528
 529         queue->entries = entries;
 530
 531         return 0;
 532 }
 533
 534 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
 535                                   struct data_queue *queue)
 536 {
 537         unsigned int i;
 538
 539         if (!queue->entries)
 540                 return;
 541
 542         for (i = 0; i < queue->limit; i++) {
 543                 if (queue->entries[i].skb)
 544                         rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
 545         }
 546 }
 547
 548 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
 549                                     struct data_queue *queue)
 550 {
 551         unsigned int i;
 552         struct sk_buff *skb;
 553
 554         for (i = 0; i < queue->limit; i++) {
 555                 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
 556                 if (!skb)
 557                         return -ENOMEM;
 558                 queue->entries[i].skb = skb;
 559         }
 560
 561         return 0;
 562 }
 563
 564 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
 565 {
 566         struct data_queue *queue;
 567         int status;
 568
 569         status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
 570         if (status)
 571                 goto exit;
 572
 573         tx_queue_for_each(rt2x00dev, queue) {
 574                 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
 575                 if (status)
 576                         goto exit;
 577         }
 578
 579         status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
 580         if (status)
 581                 goto exit;
 582
 583         if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
 584                 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
 585                                                    rt2x00dev->ops->atim);
 586                 if (status)
 587                         goto exit;
 588         }
 589
 590         status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
 591         if (status)
 592                 goto exit;
 593
 594         return 0;
 595
 596 exit:
 597         ERROR(rt2x00dev, "Queue entries allocation failed.\n");
 598
 599         rt2x00queue_uninitialize(rt2x00dev);
 600
 601         return status;
 602 }
 603
 604 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
 605 {
 606         struct data_queue *queue;
 607
 608         rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
 609
 610         queue_for_each(rt2x00dev, queue) {
 611                 kfree(queue->entries);
 612                 queue->entries = NULL;
 613         }
 614 }
 615
 616 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 617                              struct data_queue *queue, enum data_queue_qid qid)
 618 {
 619         spin_lock_init(&queue->lock);
 620
 621         queue->rt2x00dev = rt2x00dev;
 622         queue->qid = qid;
 623         queue->aifs = 2;
 624         queue->cw_min = 5;
 625         queue->cw_max = 10;
 626 }
 627
 628 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
 629 {
 630         struct data_queue *queue;
 631         enum data_queue_qid qid;
 632         unsigned int req_atim =
 633             !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 634
 635         /*
 636          * We need the following queues:
 637          * RX: 1
 638          * TX: ops->tx_queues
 639          * Beacon: 1
 640          * Atim: 1 (if required)
 641          */
 642         rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
 643
 644         queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
 645         if (!queue) {
 646                 ERROR(rt2x00dev, "Queue allocation failed.\n");
 647                 return -ENOMEM;
 648         }
 649
 650         /*
 651          * Initialize pointers
 652          */
 653         rt2x00dev->rx = queue;
 654         rt2x00dev->tx = &queue[1];
 655         rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
 656
 657         /*
 658          * Initialize queue parameters.
 659          * RX: qid = QID_RX
 660          * TX: qid = QID_AC_BE + index
 661          * TX: cw_min: 2^5 = 32.
 662          * TX: cw_max: 2^10 = 1024.
 663          * BCN: qid = QID_BEACON
 664          * ATIM: qid = QID_ATIM
 665          */
 666         rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
 667
 668         qid = QID_AC_BE;
 669         tx_queue_for_each(rt2x00dev, queue)
 670                 rt2x00queue_init(rt2x00dev, queue, qid++);
 671
 672         rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
 673         if (req_atim)
 674                 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
 675
 676         return 0;
 677 }
 678
 679 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
 680 {
 681         kfree(rt2x00dev->rx);
 682         rt2x00dev->rx = NULL;
 683         rt2x00dev->tx = NULL;
 684         rt2x00dev->bcn = NULL;
 685 }