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         struct sk_buff *skb;
  37         struct skb_frame_desc *skbdesc;
  38         unsigned int frame_size;
  39         unsigned int head_size = 0;
  40         unsigned int tail_size = 0;
  41
  42         /*
  43          * The frame size includes descriptor size, because the
  44          * hardware directly receive the frame into the skbuffer.
  45          */
  46         frame_size = entry->queue->data_size + entry->queue->desc_size;
  47
  48         /*
  49          * The payload should be aligned to a 4-byte boundary,
  50          * this means we need at least 3 bytes for moving the frame
  51          * into the correct offset.
  52          */
  53         head_size = 4;
  54
  55         /*
  56          * For IV/EIV/ICV assembly we must make sure there is
  57          * at least 8 bytes bytes available in headroom for IV/EIV
  58          * and 4 bytes for ICV data as tailroon.
  59          */
  60 #ifdef CONFIG_RT2X00_LIB_CRYPTO
  61         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
  62                 head_size += 8;
  63                 tail_size += 4;
  64         }
  65 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
  66
  67         /*
  68          * Allocate skbuffer.
  69          */
  70         skb = dev_alloc_skb(frame_size + head_size + tail_size);
  71         if (!skb)
  72                 return NULL;
  73
  74         /*
  75          * Make sure we not have a frame with the requested bytes
  76          * available in the head and tail.
  77          */
  78         skb_reserve(skb, head_size);
  79         skb_put(skb, frame_size);
  80
  81         /*
  82          * Populate skbdesc.
  83          */
  84         skbdesc = get_skb_frame_desc(skb);
  85         memset(skbdesc, 0, sizeof(*skbdesc));
  86         skbdesc->entry = entry;
  87
  88         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
  89                 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
  90                                                   skb->data,
  91                                                   skb->len,
  92                                                   DMA_FROM_DEVICE);
  93                 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
  94         }
  95
  96         return skb;
  97 }
  98
  99 void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 100 {
 101         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 102
 103         /*
 104          * If device has requested headroom, we should make sure that
 105          * is also mapped to the DMA so it can be used for transfering
 106          * additional descriptor information to the hardware.
 107          */
 108         skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
 109
 110         skbdesc->skb_dma =
 111             dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
 112
 113         /*
 114          * Restore data pointer to original location again.
 115          */
 116         skb_pull(skb, rt2x00dev->hw->extra_tx_headroom);
 117
 118         skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
 119 }
 120 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
 121
 122 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 123 {
 124         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 125
 126         if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
 127                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
 128                                  DMA_FROM_DEVICE);
 129                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
 130         }
 131
 132         if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
 133                 /*
 134                  * Add headroom to the skb length, it has been removed
 135                  * by the driver, but it was actually mapped to DMA.
 136                  */
 137                 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
 138                                  skb->len + rt2x00dev->hw->extra_tx_headroom,
 139                                  DMA_TO_DEVICE);
 140                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
 141         }
 142 }
 143
 144 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 145 {
 146         if (!skb)
 147                 return;
 148
 149         rt2x00queue_unmap_skb(rt2x00dev, skb);
 150         dev_kfree_skb_any(skb);
 151 }
 152
 153 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 154                                              struct txentry_desc *txdesc)
 155 {
 156         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 157         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 158         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 159         struct ieee80211_rate *rate =
 160             ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
 161         const struct rt2x00_rate *hwrate;
 162         unsigned int data_length;
 163         unsigned int duration;
 164         unsigned int residual;
 165         unsigned long irqflags;
 166
 167         memset(txdesc, 0, sizeof(*txdesc));
 168
 169         /*
 170          * Initialize information from queue
 171          */
 172         txdesc->queue = entry->queue->qid;
 173         txdesc->cw_min = entry->queue->cw_min;
 174         txdesc->cw_max = entry->queue->cw_max;
 175         txdesc->aifs = entry->queue->aifs;
 176
 177         /* Data length + CRC + IV/EIV/ICV/MMIC (when using encryption) */
 178         data_length = entry->skb->len + 4;
 179
 180         /*
 181          * Check whether this frame is to be acked.
 182          */
 183         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 184                 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 185
 186 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 187         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags) &&
 188             !entry->skb->do_not_encrypt) {
 189                 struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
 190
 191                 __set_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags);
 192
 193                 txdesc->cipher = rt2x00crypto_key_to_cipher(hw_key);
 194
 195                 if (hw_key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 196                         __set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags);
 197
 198                 txdesc->key_idx = hw_key->hw_key_idx;
 199                 txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb);
 200
 201                 /*
 202                  * Extend frame length to include all encryption overhead
 203                  * that will be added by the hardware.
 204                  */
 205                 data_length += rt2x00crypto_tx_overhead(tx_info);
 206
 207                 if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
 208                         __set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags);
 209
 210                 if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
 211                         __set_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags);
 212         }
 213 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
 214
 215         /*
 216          * Check if this is a RTS/CTS frame
 217          */
 218         if (ieee80211_is_rts(hdr->frame_control) ||
 219             ieee80211_is_cts(hdr->frame_control)) {
 220                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 221                 if (ieee80211_is_rts(hdr->frame_control))
 222                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
 223                 else
 224                         __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
 225                 if (tx_info->control.rts_cts_rate_idx >= 0)
 226                         rate =
 227                             ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
 228         }
 229
 230         /*
 231          * Determine retry information.
 232          */
 233         txdesc->retry_limit = tx_info->control.retry_limit;
 234         if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
 235                 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
 236
 237         /*
 238          * Check if more fragments are pending
 239          */
 240         if (ieee80211_has_morefrags(hdr->frame_control)) {
 241                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 242                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
 243         }
 244
 245         /*
 246          * Beacons and probe responses require the tsf timestamp
 247          * to be inserted into the frame.
 248          */
 249         if (ieee80211_is_beacon(hdr->frame_control) ||
 250             ieee80211_is_probe_resp(hdr->frame_control))
 251                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
 252
 253         /*
 254          * Determine with what IFS priority this frame should be send.
 255          * Set ifs to IFS_SIFS when the this is not the first fragment,
 256          * or this fragment came after RTS/CTS.
 257          */
 258         if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
 259                 txdesc->ifs = IFS_SIFS;
 260         } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
 261                 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
 262                 txdesc->ifs = IFS_BACKOFF;
 263         } else {
 264                 txdesc->ifs = IFS_SIFS;
 265         }
 266
 267         /*
 268          * Hardware should insert sequence counter.
 269          * FIXME: We insert a software sequence counter first for
 270          * hardware that doesn't support hardware sequence counting.
 271          *
 272          * This is wrong because beacons are not getting sequence
 273          * numbers assigned properly.
 274          *
 275          * A secondary problem exists for drivers that cannot toggle
 276          * sequence counting per-frame, since those will override the
 277          * sequence counter given by mac80211.
 278          */
 279         if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 280                 if (likely(tx_info->control.vif)) {
 281                         struct rt2x00_intf *intf;
 282
 283                         intf = vif_to_intf(tx_info->control.vif);
 284
 285                         spin_lock_irqsave(&intf->seqlock, irqflags);
 286
 287                         if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
 288                                 intf->seqno += 0x10;
 289                         hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 290                         hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
 291
 292                         spin_unlock_irqrestore(&intf->seqlock, irqflags);
 293
 294                         __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
 295                 }
 296         }
 297
 298         /*
 299          * PLCP setup
 300          * Length calculation depends on OFDM/CCK rate.
 301          */
 302         hwrate = rt2x00_get_rate(rate->hw_value);
 303         txdesc->signal = hwrate->plcp;
 304         txdesc->service = 0x04;
 305
 306         if (hwrate->flags & DEV_RATE_OFDM) {
 307                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags);
 308
 309                 txdesc->length_high = (data_length >> 6) & 0x3f;
 310                 txdesc->length_low = data_length & 0x3f;
 311         } else {
 312                 /*
 313                  * Convert length to microseconds.
 314                  */
 315                 residual = get_duration_res(data_length, hwrate->bitrate);
 316                 duration = get_duration(data_length, hwrate->bitrate);
 317
 318                 if (residual != 0) {
 319                         duration++;
 320
 321                         /*
 322                          * Check if we need to set the Length Extension
 323                          */
 324                         if (hwrate->bitrate == 110 && residual <= 30)
 325                                 txdesc->service |= 0x80;
 326                 }
 327
 328                 txdesc->length_high = (duration >> 8) & 0xff;
 329                 txdesc->length_low = duration & 0xff;
 330
 331                 /*
 332                  * When preamble is enabled we should set the
 333                  * preamble bit for the signal.
 334                  */
 335                 if (rt2x00_get_rate_preamble(rate->hw_value))
 336                         txdesc->signal |= 0x08;
 337         }
 338 }
 339
 340 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
 341                                             struct txentry_desc *txdesc)
 342 {
 343         struct data_queue *queue = entry->queue;
 344         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 345
 346         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
 347
 348         /*
 349          * All processing on the frame has been completed, this means
 350          * it is now ready to be dumped to userspace through debugfs.
 351          */
 352         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
 353
 354         /*
 355          * Check if we need to kick the queue, there are however a few rules
 356          *      1) Don't kick beacon queue
 357          *      2) Don't kick unless this is the last in frame in a burst.
 358          *         When the burst flag is set, this frame is always followed
 359          *         by another frame which in some way are related to eachother.
 360          *         This is true for fragments, RTS or CTS-to-self frames.
 361          *      3) Rule 2 can be broken when the available entries
 362          *         in the queue are less then a certain threshold.
 363          */
 364         if (entry->queue->qid == QID_BEACON)
 365                 return;
 366
 367         if (rt2x00queue_threshold(queue) ||
 368             !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
 369                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
 370 }
 371
 372 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 373 {
 374         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 375         struct txentry_desc txdesc;
 376         struct skb_frame_desc *skbdesc;
 377         unsigned int iv_len = 0;
 378
 379         if (unlikely(rt2x00queue_full(queue)))
 380                 return -EINVAL;
 381
 382         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 383                 ERROR(queue->rt2x00dev,
 384                       "Arrived at non-free entry in the non-full queue %d.\n"
 385                       "Please file bug report to %s.\n",
 386                       queue->qid, DRV_PROJECT);
 387                 return -EINVAL;
 388         }
 389
 390         /*
 391          * Copy all TX descriptor information into txdesc,
 392          * after that we are free to use the skb->cb array
 393          * for our information.
 394          */
 395         entry->skb = skb;
 396         rt2x00queue_create_tx_descriptor(entry, &txdesc);
 397
 398         if (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)
 399                 iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
 400
 401         /*
 402          * All information is retreived from the skb->cb array,
 403          * now we should claim ownership of the driver part of that
 404          * array.
 405          */
 406         skbdesc = get_skb_frame_desc(entry->skb);
 407         memset(skbdesc, 0, sizeof(*skbdesc));
 408         skbdesc->entry = entry;
 409
 410         /*
 411          * When hardware encryption is supported, and this frame
 412          * is to be encrypted, we should strip the IV/EIV data from
 413          * the frame so we can provide it to the driver seperately.
 414          */
 415         if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
 416             !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
 417                 rt2x00crypto_tx_remove_iv(skb, iv_len);
 418         }
 419
 420         /*
 421          * It could be possible that the queue was corrupted and this
 422          * call failed. Just drop the frame, we cannot rollback and pass
 423          * the frame to mac80211 because the skb->cb has now been tainted.
 424          */
 425         if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
 426                 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 427                 dev_kfree_skb_any(entry->skb);
 428                 entry->skb = NULL;
 429                 return 0;
 430         }
 431
 432         if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
 433                 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
 434
 435         set_bit(ENTRY_DATA_PENDING, &entry->flags);
 436
 437         rt2x00queue_index_inc(queue, Q_INDEX);
 438         rt2x00queue_write_tx_descriptor(entry, &txdesc);
 439
 440         return 0;
 441 }
 442
 443 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
 444                               struct ieee80211_vif *vif)
 445 {
 446         struct rt2x00_intf *intf = vif_to_intf(vif);
 447         struct skb_frame_desc *skbdesc;
 448         struct txentry_desc txdesc;
 449         __le32 desc[16];
 450
 451         if (unlikely(!intf->beacon))
 452                 return -ENOBUFS;
 453
 454         intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 455         if (!intf->beacon->skb)
 456                 return -ENOMEM;
 457
 458         /*
 459          * Copy all TX descriptor information into txdesc,
 460          * after that we are free to use the skb->cb array
 461          * for our information.
 462          */
 463         rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
 464
 465         /*
 466          * For the descriptor we use a local array from where the
 467          * driver can move it to the correct location required for
 468          * the hardware.
 469          */
 470         memset(desc, 0, sizeof(desc));
 471
 472         /*
 473          * Fill in skb descriptor
 474          */
 475         skbdesc = get_skb_frame_desc(intf->beacon->skb);
 476         memset(skbdesc, 0, sizeof(*skbdesc));
 477         skbdesc->desc = desc;
 478         skbdesc->desc_len = intf->beacon->queue->desc_size;
 479         skbdesc->entry = intf->beacon;
 480
 481         /*
 482          * Write TX descriptor into reserved room in front of the beacon.
 483          */
 484         rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
 485
 486         /*
 487          * Send beacon to hardware.
 488          * Also enable beacon generation, which might have been disabled
 489          * by the driver during the config_beacon() callback function.
 490          */
 491         rt2x00dev->ops->lib->write_beacon(intf->beacon);
 492         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
 493
 494         return 0;
 495 }
 496
 497 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
 498                                          const enum data_queue_qid queue)
 499 {
 500         int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 501
 502         if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
 503                 return &rt2x00dev->tx[queue];
 504
 505         if (!rt2x00dev->bcn)
 506                 return NULL;
 507
 508         if (queue == QID_BEACON)
 509                 return &rt2x00dev->bcn[0];
 510         else if (queue == QID_ATIM && atim)
 511                 return &rt2x00dev->bcn[1];
 512
 513         return NULL;
 514 }
 515 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
 516
 517 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
 518                                           enum queue_index index)
 519 {
 520         struct queue_entry *entry;
 521         unsigned long irqflags;
 522
 523         if (unlikely(index >= Q_INDEX_MAX)) {
 524                 ERROR(queue->rt2x00dev,
 525                       "Entry requested from invalid index type (%d)\n", index);
 526                 return NULL;
 527         }
 528
 529         spin_lock_irqsave(&queue->lock, irqflags);
 530
 531         entry = &queue->entries[queue->index[index]];
 532
 533         spin_unlock_irqrestore(&queue->lock, irqflags);
 534
 535         return entry;
 536 }
 537 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
 538
 539 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
 540 {
 541         unsigned long irqflags;
 542
 543         if (unlikely(index >= Q_INDEX_MAX)) {
 544                 ERROR(queue->rt2x00dev,
 545                       "Index change on invalid index type (%d)\n", index);
 546                 return;
 547         }
 548
 549         spin_lock_irqsave(&queue->lock, irqflags);
 550
 551         queue->index[index]++;
 552         if (queue->index[index] >= queue->limit)
 553                 queue->index[index] = 0;
 554
 555         if (index == Q_INDEX) {
 556                 queue->length++;
 557         } else if (index == Q_INDEX_DONE) {
 558                 queue->length--;
 559                 queue->count ++;
 560         }
 561
 562         spin_unlock_irqrestore(&queue->lock, irqflags);
 563 }
 564
 565 static void rt2x00queue_reset(struct data_queue *queue)
 566 {
 567         unsigned long irqflags;
 568
 569         spin_lock_irqsave(&queue->lock, irqflags);
 570
 571         queue->count = 0;
 572         queue->length = 0;
 573         memset(queue->index, 0, sizeof(queue->index));
 574
 575         spin_unlock_irqrestore(&queue->lock, irqflags);
 576 }
 577
 578 void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
 579 {
 580         struct data_queue *queue = rt2x00dev->rx;
 581         unsigned int i;
 582
 583         rt2x00queue_reset(queue);
 584
 585         if (!rt2x00dev->ops->lib->init_rxentry)
 586                 return;
 587
 588         for (i = 0; i < queue->limit; i++) {
 589                 queue->entries[i].flags = 0;
 590
 591                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
 592                                                   &queue->entries[i]);
 593         }
 594 }
 595
 596 void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
 597 {
 598         struct data_queue *queue;
 599         unsigned int i;
 600
 601         txall_queue_for_each(rt2x00dev, queue) {
 602                 rt2x00queue_reset(queue);
 603
 604                 if (!rt2x00dev->ops->lib->init_txentry)
 605                         continue;
 606
 607                 for (i = 0; i < queue->limit; i++) {
 608                         queue->entries[i].flags = 0;
 609
 610                         rt2x00dev->ops->lib->init_txentry(rt2x00dev,
 611                                                           &queue->entries[i]);
 612                 }
 613         }
 614 }
 615
 616 static int rt2x00queue_alloc_entries(struct data_queue *queue,
 617                                      const struct data_queue_desc *qdesc)
 618 {
 619         struct queue_entry *entries;
 620         unsigned int entry_size;
 621         unsigned int i;
 622
 623         rt2x00queue_reset(queue);
 624
 625         queue->limit = qdesc->entry_num;
 626         queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
 627         queue->data_size = qdesc->data_size;
 628         queue->desc_size = qdesc->desc_size;
 629
 630         /*
 631          * Allocate all queue entries.
 632          */
 633         entry_size = sizeof(*entries) + qdesc->priv_size;
 634         entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
 635         if (!entries)
 636                 return -ENOMEM;
 637
 638 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
 639         ( ((char *)(__base)) + ((__limit) * (__esize)) + \
 640             ((__index) * (__psize)) )
 641
 642         for (i = 0; i < queue->limit; i++) {
 643                 entries[i].flags = 0;
 644                 entries[i].queue = queue;
 645                 entries[i].skb = NULL;
 646                 entries[i].entry_idx = i;
 647                 entries[i].priv_data =
 648                     QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
 649                                             sizeof(*entries), qdesc->priv_size);
 650         }
 651
 652 #undef QUEUE_ENTRY_PRIV_OFFSET
 653
 654         queue->entries = entries;
 655
 656         return 0;
 657 }
 658
 659 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
 660                                   struct data_queue *queue)
 661 {
 662         unsigned int i;
 663
 664         if (!queue->entries)
 665                 return;
 666
 667         for (i = 0; i < queue->limit; i++) {
 668                 if (queue->entries[i].skb)
 669                         rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
 670         }
 671 }
 672
 673 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
 674                                     struct data_queue *queue)
 675 {
 676         unsigned int i;
 677         struct sk_buff *skb;
 678
 679         for (i = 0; i < queue->limit; i++) {
 680                 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
 681                 if (!skb)
 682                         return -ENOMEM;
 683                 queue->entries[i].skb = skb;
 684         }
 685
 686         return 0;
 687 }
 688
 689 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
 690 {
 691         struct data_queue *queue;
 692         int status;
 693
 694         status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
 695         if (status)
 696                 goto exit;
 697
 698         tx_queue_for_each(rt2x00dev, queue) {
 699                 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
 700                 if (status)
 701                         goto exit;
 702         }
 703
 704         status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
 705         if (status)
 706                 goto exit;
 707
 708         if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
 709                 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
 710                                                    rt2x00dev->ops->atim);
 711                 if (status)
 712                         goto exit;
 713         }
 714
 715         status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
 716         if (status)
 717                 goto exit;
 718
 719         return 0;
 720
 721 exit:
 722         ERROR(rt2x00dev, "Queue entries allocation failed.\n");
 723
 724         rt2x00queue_uninitialize(rt2x00dev);
 725
 726         return status;
 727 }
 728
 729 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
 730 {
 731         struct data_queue *queue;
 732
 733         rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
 734
 735         queue_for_each(rt2x00dev, queue) {
 736                 kfree(queue->entries);
 737                 queue->entries = NULL;
 738         }
 739 }
 740
 741 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 742                              struct data_queue *queue, enum data_queue_qid qid)
 743 {
 744         spin_lock_init(&queue->lock);
 745
 746         queue->rt2x00dev = rt2x00dev;
 747         queue->qid = qid;
 748         queue->txop = 0;
 749         queue->aifs = 2;
 750         queue->cw_min = 5;
 751         queue->cw_max = 10;
 752 }
 753
 754 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
 755 {
 756         struct data_queue *queue;
 757         enum data_queue_qid qid;
 758         unsigned int req_atim =
 759             !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 760
 761         /*
 762          * We need the following queues:
 763          * RX: 1
 764          * TX: ops->tx_queues
 765          * Beacon: 1
 766          * Atim: 1 (if required)
 767          */
 768         rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
 769
 770         queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
 771         if (!queue) {
 772                 ERROR(rt2x00dev, "Queue allocation failed.\n");
 773                 return -ENOMEM;
 774         }
 775
 776         /*
 777          * Initialize pointers
 778          */
 779         rt2x00dev->rx = queue;
 780         rt2x00dev->tx = &queue[1];
 781         rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
 782
 783         /*
 784          * Initialize queue parameters.
 785          * RX: qid = QID_RX
 786          * TX: qid = QID_AC_BE + index
 787          * TX: cw_min: 2^5 = 32.
 788          * TX: cw_max: 2^10 = 1024.
 789          * BCN: qid = QID_BEACON
 790          * ATIM: qid = QID_ATIM
 791          */
 792         rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
 793
 794         qid = QID_AC_BE;
 795         tx_queue_for_each(rt2x00dev, queue)
 796                 rt2x00queue_init(rt2x00dev, queue, qid++);
 797
 798         rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
 799         if (req_atim)
 800                 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
 801
 802         return 0;
 803 }
 804
 805 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
 806 {
 807         kfree(rt2x00dev->rx);
 808         rt2x00dev->rx = NULL;
 809         rt2x00dev->tx = NULL;
 810         rt2x00dev->bcn = NULL;
 811 }