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 rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
 124         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 125         struct ieee80211_rate *rate =
 126             ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
 127         const struct rt2x00_rate *hwrate;
 128         unsigned int data_length;
 129         unsigned int duration;
 130         unsigned int residual;
 131         unsigned long irqflags;
 132
 133         memset(txdesc, 0, sizeof(*txdesc));
 134
 135         /*
 136          * Initialize information from queue
 137          */
 138         txdesc->queue = entry->queue->qid;
 139         txdesc->cw_min = entry->queue->cw_min;
 140         txdesc->cw_max = entry->queue->cw_max;
 141         txdesc->aifs = entry->queue->aifs;
 142
 143         /* Data length should be extended with 4 bytes for CRC */
 144         data_length = entry->skb->len + 4;
 145
 146         /*
 147          * Check whether this frame is to be acked.
 148          */
 149         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 150                 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 151
 152         /*
 153          * Check if this is a RTS/CTS frame
 154          */
 155         if (ieee80211_is_rts(hdr->frame_control) ||
 156             ieee80211_is_cts(hdr->frame_control)) {
 157                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 158                 if (ieee80211_is_rts(hdr->frame_control))
 159                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
 160                 else
 161                         __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
 162                 if (tx_info->control.rts_cts_rate_idx >= 0)
 163                         rate =
 164                             ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
 165         }
 166
 167         /*
 168          * Determine retry information.
 169          */
 170         txdesc->retry_limit = tx_info->control.retry_limit;
 171         if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
 172                 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
 173
 174         /*
 175          * Check if more fragments are pending
 176          */
 177         if (ieee80211_has_morefrags(hdr->frame_control)) {
 178                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 179                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
 180         }
 181
 182         /*
 183          * Beacons and probe responses require the tsf timestamp
 184          * to be inserted into the frame.
 185          */
 186         if (ieee80211_is_beacon(hdr->frame_control) ||
 187             ieee80211_is_probe_resp(hdr->frame_control))
 188                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
 189
 190         /*
 191          * Determine with what IFS priority this frame should be send.
 192          * Set ifs to IFS_SIFS when the this is not the first fragment,
 193          * or this fragment came after RTS/CTS.
 194          */
 195         if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
 196                 txdesc->ifs = IFS_SIFS;
 197         } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
 198                 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
 199                 txdesc->ifs = IFS_BACKOFF;
 200         } else {
 201                 txdesc->ifs = IFS_SIFS;
 202         }
 203
 204         /*
 205          * Hardware should insert sequence counter.
 206          * FIXME: We insert a software sequence counter first for
 207          * hardware that doesn't support hardware sequence counting.
 208          *
 209          * This is wrong because beacons are not getting sequence
 210          * numbers assigned properly.
 211          *
 212          * A secondary problem exists for drivers that cannot toggle
 213          * sequence counting per-frame, since those will override the
 214          * sequence counter given by mac80211.
 215          */
 216         if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 217                 spin_lock_irqsave(&intf->seqlock, irqflags);
 218
 219                 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
 220                         intf->seqno += 0x10;
 221                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 222                 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
 223
 224                 spin_unlock_irqrestore(&intf->seqlock, irqflags);
 225
 226                 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
 227         }
 228
 229         /*
 230          * PLCP setup
 231          * Length calculation depends on OFDM/CCK rate.
 232          */
 233         hwrate = rt2x00_get_rate(rate->hw_value);
 234         txdesc->signal = hwrate->plcp;
 235         txdesc->service = 0x04;
 236
 237         if (hwrate->flags & DEV_RATE_OFDM) {
 238                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags);
 239
 240                 txdesc->length_high = (data_length >> 6) & 0x3f;
 241                 txdesc->length_low = data_length & 0x3f;
 242         } else {
 243                 /*
 244                  * Convert length to microseconds.
 245                  */
 246                 residual = get_duration_res(data_length, hwrate->bitrate);
 247                 duration = get_duration(data_length, hwrate->bitrate);
 248
 249                 if (residual != 0) {
 250                         duration++;
 251
 252                         /*
 253                          * Check if we need to set the Length Extension
 254                          */
 255                         if (hwrate->bitrate == 110 && residual <= 30)
 256                                 txdesc->service |= 0x80;
 257                 }
 258
 259                 txdesc->length_high = (duration >> 8) & 0xff;
 260                 txdesc->length_low = duration & 0xff;
 261
 262                 /*
 263                  * When preamble is enabled we should set the
 264                  * preamble bit for the signal.
 265                  */
 266                 if (rt2x00_get_rate_preamble(rate->hw_value))
 267                         txdesc->signal |= 0x08;
 268         }
 269 }
 270
 271 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
 272                                             struct txentry_desc *txdesc)
 273 {
 274         struct data_queue *queue = entry->queue;
 275         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 276
 277         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
 278
 279         /*
 280          * All processing on the frame has been completed, this means
 281          * it is now ready to be dumped to userspace through debugfs.
 282          */
 283         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
 284
 285         /*
 286          * Check if we need to kick the queue, there are however a few rules
 287          *      1) Don't kick beacon queue
 288          *      2) Don't kick unless this is the last in frame in a burst.
 289          *         When the burst flag is set, this frame is always followed
 290          *         by another frame which in some way are related to eachother.
 291          *         This is true for fragments, RTS or CTS-to-self frames.
 292          *      3) Rule 2 can be broken when the available entries
 293          *         in the queue are less then a certain threshold.
 294          */
 295         if (entry->queue->qid == QID_BEACON)
 296                 return;
 297
 298         if (rt2x00queue_threshold(queue) ||
 299             !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
 300                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
 301 }
 302
 303 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 304 {
 305         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 306         struct txentry_desc txdesc;
 307         struct skb_frame_desc *skbdesc;
 308
 309         if (unlikely(rt2x00queue_full(queue)))
 310                 return -EINVAL;
 311
 312         if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 313                 ERROR(queue->rt2x00dev,
 314                       "Arrived at non-free entry in the non-full queue %d.\n"
 315                       "Please file bug report to %s.\n",
 316                       queue->qid, DRV_PROJECT);
 317                 return -EINVAL;
 318         }
 319
 320         /*
 321          * Copy all TX descriptor information into txdesc,
 322          * after that we are free to use the skb->cb array
 323          * for our information.
 324          */
 325         entry->skb = skb;
 326         rt2x00queue_create_tx_descriptor(entry, &txdesc);
 327
 328         /*
 329          * skb->cb array is now ours and we are free to use it.
 330          */
 331         skbdesc = get_skb_frame_desc(entry->skb);
 332         memset(skbdesc, 0, sizeof(*skbdesc));
 333         skbdesc->entry = entry;
 334
 335         if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
 336                 __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 337                 return -EIO;
 338         }
 339
 340         if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
 341                 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
 342
 343         __set_bit(ENTRY_DATA_PENDING, &entry->flags);
 344
 345         rt2x00queue_index_inc(queue, Q_INDEX);
 346         rt2x00queue_write_tx_descriptor(entry, &txdesc);
 347
 348         return 0;
 349 }
 350
 351 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
 352                               struct ieee80211_vif *vif)
 353 {
 354         struct rt2x00_intf *intf = vif_to_intf(vif);
 355         struct skb_frame_desc *skbdesc;
 356         struct txentry_desc txdesc;
 357         __le32 desc[16];
 358
 359         if (unlikely(!intf->beacon))
 360                 return -ENOBUFS;
 361
 362         intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 363         if (!intf->beacon->skb)
 364                 return -ENOMEM;
 365
 366         /*
 367          * Copy all TX descriptor information into txdesc,
 368          * after that we are free to use the skb->cb array
 369          * for our information.
 370          */
 371         rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
 372
 373         /*
 374          * For the descriptor we use a local array from where the
 375          * driver can move it to the correct location required for
 376          * the hardware.
 377          */
 378         memset(desc, 0, sizeof(desc));
 379
 380         /*
 381          * Fill in skb descriptor
 382          */
 383         skbdesc = get_skb_frame_desc(intf->beacon->skb);
 384         memset(skbdesc, 0, sizeof(*skbdesc));
 385         skbdesc->desc = desc;
 386         skbdesc->desc_len = intf->beacon->queue->desc_size;
 387         skbdesc->entry = intf->beacon;
 388
 389         /*
 390          * Write TX descriptor into reserved room in front of the beacon.
 391          */
 392         rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
 393
 394         /*
 395          * Send beacon to hardware.
 396          * Also enable beacon generation, which might have been disabled
 397          * by the driver during the config_beacon() callback function.
 398          */
 399         rt2x00dev->ops->lib->write_beacon(intf->beacon);
 400         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
 401
 402         return 0;
 403 }
 404
 405 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
 406                                          const enum data_queue_qid queue)
 407 {
 408         int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 409
 410         if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
 411                 return &rt2x00dev->tx[queue];
 412
 413         if (!rt2x00dev->bcn)
 414                 return NULL;
 415
 416         if (queue == QID_BEACON)
 417                 return &rt2x00dev->bcn[0];
 418         else if (queue == QID_ATIM && atim)
 419                 return &rt2x00dev->bcn[1];
 420
 421         return NULL;
 422 }
 423 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
 424
 425 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
 426                                           enum queue_index index)
 427 {
 428         struct queue_entry *entry;
 429         unsigned long irqflags;
 430
 431         if (unlikely(index >= Q_INDEX_MAX)) {
 432                 ERROR(queue->rt2x00dev,
 433                       "Entry requested from invalid index type (%d)\n", index);
 434                 return NULL;
 435         }
 436
 437         spin_lock_irqsave(&queue->lock, irqflags);
 438
 439         entry = &queue->entries[queue->index[index]];
 440
 441         spin_unlock_irqrestore(&queue->lock, irqflags);
 442
 443         return entry;
 444 }
 445 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
 446
 447 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
 448 {
 449         unsigned long irqflags;
 450
 451         if (unlikely(index >= Q_INDEX_MAX)) {
 452                 ERROR(queue->rt2x00dev,
 453                       "Index change on invalid index type (%d)\n", index);
 454                 return;
 455         }
 456
 457         spin_lock_irqsave(&queue->lock, irqflags);
 458
 459         queue->index[index]++;
 460         if (queue->index[index] >= queue->limit)
 461                 queue->index[index] = 0;
 462
 463         if (index == Q_INDEX) {
 464                 queue->length++;
 465         } else if (index == Q_INDEX_DONE) {
 466                 queue->length--;
 467                 queue->count ++;
 468         }
 469
 470         spin_unlock_irqrestore(&queue->lock, irqflags);
 471 }
 472
 473 static void rt2x00queue_reset(struct data_queue *queue)
 474 {
 475         unsigned long irqflags;
 476
 477         spin_lock_irqsave(&queue->lock, irqflags);
 478
 479         queue->count = 0;
 480         queue->length = 0;
 481         memset(queue->index, 0, sizeof(queue->index));
 482
 483         spin_unlock_irqrestore(&queue->lock, irqflags);
 484 }
 485
 486 void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
 487 {
 488         struct data_queue *queue = rt2x00dev->rx;
 489         unsigned int i;
 490
 491         rt2x00queue_reset(queue);
 492
 493         if (!rt2x00dev->ops->lib->init_rxentry)
 494                 return;
 495
 496         for (i = 0; i < queue->limit; i++) {
 497                 queue->entries[i].flags = 0;
 498
 499                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
 500                                                   &queue->entries[i]);
 501         }
 502 }
 503
 504 void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
 505 {
 506         struct data_queue *queue;
 507         unsigned int i;
 508
 509         txall_queue_for_each(rt2x00dev, queue) {
 510                 rt2x00queue_reset(queue);
 511
 512                 if (!rt2x00dev->ops->lib->init_txentry)
 513                         continue;
 514
 515                 for (i = 0; i < queue->limit; i++) {
 516                         queue->entries[i].flags = 0;
 517
 518                         rt2x00dev->ops->lib->init_txentry(rt2x00dev,
 519                                                           &queue->entries[i]);
 520                 }
 521         }
 522 }
 523
 524 static int rt2x00queue_alloc_entries(struct data_queue *queue,
 525                                      const struct data_queue_desc *qdesc)
 526 {
 527         struct queue_entry *entries;
 528         unsigned int entry_size;
 529         unsigned int i;
 530
 531         rt2x00queue_reset(queue);
 532
 533         queue->limit = qdesc->entry_num;
 534         queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
 535         queue->data_size = qdesc->data_size;
 536         queue->desc_size = qdesc->desc_size;
 537
 538         /*
 539          * Allocate all queue entries.
 540          */
 541         entry_size = sizeof(*entries) + qdesc->priv_size;
 542         entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
 543         if (!entries)
 544                 return -ENOMEM;
 545
 546 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
 547         ( ((char *)(__base)) + ((__limit) * (__esize)) + \
 548             ((__index) * (__psize)) )
 549
 550         for (i = 0; i < queue->limit; i++) {
 551                 entries[i].flags = 0;
 552                 entries[i].queue = queue;
 553                 entries[i].skb = NULL;
 554                 entries[i].entry_idx = i;
 555                 entries[i].priv_data =
 556                     QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
 557                                             sizeof(*entries), qdesc->priv_size);
 558         }
 559
 560 #undef QUEUE_ENTRY_PRIV_OFFSET
 561
 562         queue->entries = entries;
 563
 564         return 0;
 565 }
 566
 567 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
 568                                   struct data_queue *queue)
 569 {
 570         unsigned int i;
 571
 572         if (!queue->entries)
 573                 return;
 574
 575         for (i = 0; i < queue->limit; i++) {
 576                 if (queue->entries[i].skb)
 577                         rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
 578         }
 579 }
 580
 581 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
 582                                     struct data_queue *queue)
 583 {
 584         unsigned int i;
 585         struct sk_buff *skb;
 586
 587         for (i = 0; i < queue->limit; i++) {
 588                 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
 589                 if (!skb)
 590                         return -ENOMEM;
 591                 queue->entries[i].skb = skb;
 592         }
 593
 594         return 0;
 595 }
 596
 597 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
 598 {
 599         struct data_queue *queue;
 600         int status;
 601
 602         status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
 603         if (status)
 604                 goto exit;
 605
 606         tx_queue_for_each(rt2x00dev, queue) {
 607                 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
 608                 if (status)
 609                         goto exit;
 610         }
 611
 612         status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
 613         if (status)
 614                 goto exit;
 615
 616         if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
 617                 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
 618                                                    rt2x00dev->ops->atim);
 619                 if (status)
 620                         goto exit;
 621         }
 622
 623         status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
 624         if (status)
 625                 goto exit;
 626
 627         return 0;
 628
 629 exit:
 630         ERROR(rt2x00dev, "Queue entries allocation failed.\n");
 631
 632         rt2x00queue_uninitialize(rt2x00dev);
 633
 634         return status;
 635 }
 636
 637 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
 638 {
 639         struct data_queue *queue;
 640
 641         rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
 642
 643         queue_for_each(rt2x00dev, queue) {
 644                 kfree(queue->entries);
 645                 queue->entries = NULL;
 646         }
 647 }
 648
 649 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 650                              struct data_queue *queue, enum data_queue_qid qid)
 651 {
 652         spin_lock_init(&queue->lock);
 653
 654         queue->rt2x00dev = rt2x00dev;
 655         queue->qid = qid;
 656         queue->aifs = 2;
 657         queue->cw_min = 5;
 658         queue->cw_max = 10;
 659 }
 660
 661 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
 662 {
 663         struct data_queue *queue;
 664         enum data_queue_qid qid;
 665         unsigned int req_atim =
 666             !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 667
 668         /*
 669          * We need the following queues:
 670          * RX: 1
 671          * TX: ops->tx_queues
 672          * Beacon: 1
 673          * Atim: 1 (if required)
 674          */
 675         rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
 676
 677         queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
 678         if (!queue) {
 679                 ERROR(rt2x00dev, "Queue allocation failed.\n");
 680                 return -ENOMEM;
 681         }
 682
 683         /*
 684          * Initialize pointers
 685          */
 686         rt2x00dev->rx = queue;
 687         rt2x00dev->tx = &queue[1];
 688         rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
 689
 690         /*
 691          * Initialize queue parameters.
 692          * RX: qid = QID_RX
 693          * TX: qid = QID_AC_BE + index
 694          * TX: cw_min: 2^5 = 32.
 695          * TX: cw_max: 2^10 = 1024.
 696          * BCN: qid = QID_BEACON
 697          * ATIM: qid = QID_ATIM
 698          */
 699         rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
 700
 701         qid = QID_AC_BE;
 702         tx_queue_for_each(rt2x00dev, queue)
 703                 rt2x00queue_init(rt2x00dev, queue, qid++);
 704
 705         rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
 706         if (req_atim)
 707                 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
 708
 709         return 0;
 710 }
 711
 712 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
 713 {
 714         kfree(rt2x00dev->rx);
 715         rt2x00dev->rx = NULL;
 716         rt2x00dev->tx = NULL;
 717         rt2x00dev->bcn = NULL;
 718 }