drivers/net/wireless/rt2x00/rt2x00queue.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
   5         <http://rt2x00.serialmonkey.com>
   6
   7         This program is free software; you can redistribute it and/or modify
   8         it under the terms of the GNU General Public License as published by
   9         the Free Software Foundation; either version 2 of the License, or
  10         (at your option) any later version.
  11
  12         This program is distributed in the hope that it will be useful,
  13         but WITHOUT ANY WARRANTY; without even the implied warranty of
  14         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15         GNU General Public License for more details.
  16
  17         You should have received a copy of the GNU General Public License
  18         along with this program; if not, write to the
  19         Free Software Foundation, Inc.,
  20         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 /*
  24         Module: rt2x00lib
  25         Abstract: rt2x00 queue specific routines.
  26  */
  27
  28 #include <linux/slab.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/dma-mapping.h>
  32
  33 #include "rt2x00.h"
  34 #include "rt2x00lib.h"
  35
  36 struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry)
  37 {
  38         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
  39         struct sk_buff *skb;
  40         struct skb_frame_desc *skbdesc;
  41         unsigned int frame_size;
  42         unsigned int head_size = 0;
  43         unsigned int tail_size = 0;
  44
  45         /*
  46          * The frame size includes descriptor size, because the
  47          * hardware directly receive the frame into the skbuffer.
  48          */
  49         frame_size = entry->queue->data_size + entry->queue->desc_size;
  50
  51         /*
  52          * The payload should be aligned to a 4-byte boundary,
  53          * this means we need at least 3 bytes for moving the frame
  54          * into the correct offset.
  55          */
  56         head_size = 4;
  57
  58         /*
  59          * For IV/EIV/ICV assembly we must make sure there is
  60          * at least 8 bytes bytes available in headroom for IV/EIV
  61          * and 8 bytes for ICV data as tailroon.
  62          */
  63         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
  64                 head_size += 8;
  65                 tail_size += 8;
  66         }
  67
  68         /*
  69          * Allocate skbuffer.
  70          */
  71         skb = dev_alloc_skb(frame_size + head_size + tail_size);
  72         if (!skb)
  73                 return NULL;
  74
  75         /*
  76          * Make sure we not have a frame with the requested bytes
  77          * available in the head and tail.
  78          */
  79         skb_reserve(skb, head_size);
  80         skb_put(skb, frame_size);
  81
  82         /*
  83          * Populate skbdesc.
  84          */
  85         skbdesc = get_skb_frame_desc(skb);
  86         memset(skbdesc, 0, sizeof(*skbdesc));
  87         skbdesc->entry = entry;
  88
  89         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
  90                 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
  91                                                   skb->data,
  92                                                   skb->len,
  93                                                   DMA_FROM_DEVICE);
  94                 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
  95         }
  96
  97         return skb;
  98 }
  99
 100 void rt2x00queue_map_txskb(struct queue_entry *entry)
 101 {
 102         struct device *dev = entry->queue->rt2x00dev->dev;
 103         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 104
 105         skbdesc->skb_dma =
 106             dma_map_single(dev, entry->skb->data, entry->skb->len, DMA_TO_DEVICE);
 107         skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
 108 }
 109 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
 110
 111 void rt2x00queue_unmap_skb(struct queue_entry *entry)
 112 {
 113         struct device *dev = entry->queue->rt2x00dev->dev;
 114         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 115
 116         if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
 117                 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
 118                                  DMA_FROM_DEVICE);
 119                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
 120         } else if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
 121                 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
 122                                  DMA_TO_DEVICE);
 123                 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
 124         }
 125 }
 126 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
 127
 128 void rt2x00queue_free_skb(struct queue_entry *entry)
 129 {
 130         if (!entry->skb)
 131                 return;
 132
 133         rt2x00queue_unmap_skb(entry);
 134         dev_kfree_skb_any(entry->skb);
 135         entry->skb = NULL;
 136 }
 137
 138 void rt2x00queue_align_frame(struct sk_buff *skb)
 139 {
 140         unsigned int frame_length = skb->len;
 141         unsigned int align = ALIGN_SIZE(skb, 0);
 142
 143         if (!align)
 144                 return;
 145
 146         skb_push(skb, align);
 147         memmove(skb->data, skb->data + align, frame_length);
 148         skb_trim(skb, frame_length);
 149 }
 150
 151 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
 152 {
 153         unsigned int frame_length = skb->len;
 154         unsigned int align = ALIGN_SIZE(skb, header_length);
 155
 156         if (!align)
 157                 return;
 158
 159         skb_push(skb, align);
 160         memmove(skb->data, skb->data + align, frame_length);
 161         skb_trim(skb, frame_length);
 162 }
 163
 164 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
 165 {
 166         unsigned int payload_length = skb->len - header_length;
 167         unsigned int header_align = ALIGN_SIZE(skb, 0);
 168         unsigned int payload_align = ALIGN_SIZE(skb, header_length);
 169         unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
 170
 171         /*
 172          * Adjust the header alignment if the payload needs to be moved more
 173          * than the header.
 174          */
 175         if (payload_align > header_align)
 176                 header_align += 4;
 177
 178         /* There is nothing to do if no alignment is needed */
 179         if (!header_align)
 180                 return;
 181
 182         /* Reserve the amount of space needed in front of the frame */
 183         skb_push(skb, header_align);
 184
 185         /*
 186          * Move the header.
 187          */
 188         memmove(skb->data, skb->data + header_align, header_length);
 189
 190         /* Move the payload, if present and if required */
 191         if (payload_length && payload_align)
 192                 memmove(skb->data + header_length + l2pad,
 193                         skb->data + header_length + l2pad + payload_align,
 194                         payload_length);
 195
 196         /* Trim the skb to the correct size */
 197         skb_trim(skb, header_length + l2pad + payload_length);
 198 }
 199
 200 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
 201 {
 202         unsigned int l2pad = L2PAD_SIZE(header_length);
 203
 204         if (!l2pad)
 205                 return;
 206
 207         memmove(skb->data + l2pad, skb->data, header_length);
 208         skb_pull(skb, l2pad);
 209 }
 210
 211 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
 212                                                  struct txentry_desc *txdesc)
 213 {
 214         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 215         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 216         struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
 217         unsigned long irqflags;
 218
 219         if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
 220             unlikely(!tx_info->control.vif))
 221                 return;
 222
 223         /*
 224          * Hardware should insert sequence counter.
 225          * FIXME: We insert a software sequence counter first for
 226          * hardware that doesn't support hardware sequence counting.
 227          *
 228          * This is wrong because beacons are not getting sequence
 229          * numbers assigned properly.
 230          *
 231          * A secondary problem exists for drivers that cannot toggle
 232          * sequence counting per-frame, since those will override the
 233          * sequence counter given by mac80211.
 234          */
 235         spin_lock_irqsave(&intf->seqlock, irqflags);
 236
 237         if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
 238                 intf->seqno += 0x10;
 239         hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 240         hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
 241
 242         spin_unlock_irqrestore(&intf->seqlock, irqflags);
 243
 244         __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
 245 }
 246
 247 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
 248                                                   struct txentry_desc *txdesc,
 249                                                   const struct rt2x00_rate *hwrate)
 250 {
 251         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 252         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 253         struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
 254         unsigned int data_length;
 255         unsigned int duration;
 256         unsigned int residual;
 257
 258         /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
 259         data_length = entry->skb->len + 4;
 260         data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
 261
 262         /*
 263          * PLCP setup
 264          * Length calculation depends on OFDM/CCK rate.
 265          */
 266         txdesc->signal = hwrate->plcp;
 267         txdesc->service = 0x04;
 268
 269         if (hwrate->flags & DEV_RATE_OFDM) {
 270                 txdesc->length_high = (data_length >> 6) & 0x3f;
 271                 txdesc->length_low = data_length & 0x3f;
 272         } else {
 273                 /*
 274                  * Convert length to microseconds.
 275                  */
 276                 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
 277                 duration = GET_DURATION(data_length, hwrate->bitrate);
 278
 279                 if (residual != 0) {
 280                         duration++;
 281
 282                         /*
 283                          * Check if we need to set the Length Extension
 284                          */
 285                         if (hwrate->bitrate == 110 && residual <= 30)
 286                                 txdesc->service |= 0x80;
 287                 }
 288
 289                 txdesc->length_high = (duration >> 8) & 0xff;
 290                 txdesc->length_low = duration & 0xff;
 291
 292                 /*
 293                  * When preamble is enabled we should set the
 294                  * preamble bit for the signal.
 295                  */
 296                 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 297                         txdesc->signal |= 0x08;
 298         }
 299 }
 300
 301 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 302                                              struct txentry_desc *txdesc)
 303 {
 304         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 305         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 306         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 307         struct ieee80211_rate *rate =
 308             ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
 309         const struct rt2x00_rate *hwrate;
 310
 311         memset(txdesc, 0, sizeof(*txdesc));
 312
 313         /*
 314          * Header and frame information.
 315          */
 316         txdesc->length = entry->skb->len;
 317         txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 318
 319         /*
 320          * Check whether this frame is to be acked.
 321          */
 322         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 323                 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 324
 325         /*
 326          * Check if this is a RTS/CTS frame
 327          */
 328         if (ieee80211_is_rts(hdr->frame_control) ||
 329             ieee80211_is_cts(hdr->frame_control)) {
 330                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 331                 if (ieee80211_is_rts(hdr->frame_control))
 332                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
 333                 else
 334                         __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
 335                 if (tx_info->control.rts_cts_rate_idx >= 0)
 336                         rate =
 337                             ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
 338         }
 339
 340         /*
 341          * Determine retry information.
 342          */
 343         txdesc->retry_limit = tx_info->control.rates[0].count - 1;
 344         if (txdesc->retry_limit >= rt2x00dev->long_retry)
 345                 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
 346
 347         /*
 348          * Check if more fragments are pending
 349          */
 350         if (ieee80211_has_morefrags(hdr->frame_control)) {
 351                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 352                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
 353         }
 354
 355         /*
 356          * Check if more frames (!= fragments) are pending
 357          */
 358         if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
 359                 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
 360
 361         /*
 362          * Beacons and probe responses require the tsf timestamp
 363          * to be inserted into the frame, except for a frame that has been injected
 364          * through a monitor interface. This latter is needed for testing a
 365          * monitor interface.
 366          */
 367         if ((ieee80211_is_beacon(hdr->frame_control) ||
 368             ieee80211_is_probe_resp(hdr->frame_control)) &&
 369             (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
 370                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
 371
 372         /*
 373          * Determine with what IFS priority this frame should be send.
 374          * Set ifs to IFS_SIFS when the this is not the first fragment,
 375          * or this fragment came after RTS/CTS.
 376          */
 377         if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
 378             !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
 379                 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
 380                 txdesc->ifs = IFS_BACKOFF;
 381         } else
 382                 txdesc->ifs = IFS_SIFS;
 383
 384         /*
 385          * Determine rate modulation.
 386          */
 387         hwrate = rt2x00_get_rate(rate->hw_value);
 388         txdesc->rate_mode = RATE_MODE_CCK;
 389         if (hwrate->flags & DEV_RATE_OFDM)
 390                 txdesc->rate_mode = RATE_MODE_OFDM;
 391
 392         /*
 393          * Apply TX descriptor handling by components
 394          */
 395         rt2x00crypto_create_tx_descriptor(entry, txdesc);
 396         rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
 397         rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
 398         rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
 399 }
 400
 401 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
 402                                      struct txentry_desc *txdesc)
 403 {
 404         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 405
 406         /*
 407          * This should not happen, we already checked the entry
 408          * was ours. When the hardware disagrees there has been
 409          * a queue corruption!
 410          */
 411         if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
 412                      rt2x00dev->ops->lib->get_entry_state(entry))) {
 413                 ERROR(rt2x00dev,
 414                       "Corrupt queue %d, accessing entry which is not ours.\n"
 415                       "Please file bug report to %s.\n",
 416                       entry->queue->qid, DRV_PROJECT);
 417                 return -EINVAL;
 418         }
 419
 420         /*
 421          * Add the requested extra tx headroom in front of the skb.
 422          */
 423         skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 424         memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
 425
 426         /*
 427          * Call the driver's write_tx_data function, if it exists.
 428          */
 429         if (rt2x00dev->ops->lib->write_tx_data)
 430                 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
 431
 432         /*
 433          * Map the skb to DMA.
 434          */
 435         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 436                 rt2x00queue_map_txskb(entry);
 437
 438         return 0;
 439 }
 440
 441 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
 442                                             struct txentry_desc *txdesc)
 443 {
 444         struct data_queue *queue = entry->queue;
 445
 446         queue->rt2x00dev->ops->lib->write_tx_desc(entry, txdesc);
 447
 448         /*
 449          * All processing on the frame has been completed, this means
 450          * it is now ready to be dumped to userspace through debugfs.
 451          */
 452         rt2x00debug_dump_frame(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
 453 }
 454
 455 static void rt2x00queue_kick_tx_queue(struct queue_entry *entry,
 456                                       struct txentry_desc *txdesc)
 457 {
 458         struct data_queue *queue = entry->queue;
 459         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 460
 461         /*
 462          * Check if we need to kick the queue, there are however a few rules
 463          *      1) Don't kick unless this is the last in frame in a burst.
 464          *         When the burst flag is set, this frame is always followed
 465          *         by another frame which in some way are related to eachother.
 466          *         This is true for fragments, RTS or CTS-to-self frames.
 467          *      2) Rule 1 can be broken when the available entries
 468          *         in the queue are less then a certain threshold.
 469          */
 470         if (rt2x00queue_threshold(queue) ||
 471             !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
 472                 rt2x00dev->ops->lib->kick_tx_queue(queue);
 473 }
 474
 475 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
 476                                bool local)
 477 {
 478         struct ieee80211_tx_info *tx_info;
 479         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 480         struct txentry_desc txdesc;
 481         struct skb_frame_desc *skbdesc;
 482         u8 rate_idx, rate_flags;
 483
 484         if (unlikely(rt2x00queue_full(queue)))
 485                 return -ENOBUFS;
 486
 487         if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
 488                                       &entry->flags))) {
 489                 ERROR(queue->rt2x00dev,
 490                       "Arrived at non-free entry in the non-full queue %d.\n"
 491                       "Please file bug report to %s.\n",
 492                       queue->qid, DRV_PROJECT);
 493                 return -EINVAL;
 494         }
 495
 496         /*
 497          * Copy all TX descriptor information into txdesc,
 498          * after that we are free to use the skb->cb array
 499          * for our information.
 500          */
 501         entry->skb = skb;
 502         rt2x00queue_create_tx_descriptor(entry, &txdesc);
 503
 504         /*
 505          * All information is retrieved from the skb->cb array,
 506          * now we should claim ownership of the driver part of that
 507          * array, preserving the bitrate index and flags.
 508          */
 509         tx_info = IEEE80211_SKB_CB(skb);
 510         rate_idx = tx_info->control.rates[0].idx;
 511         rate_flags = tx_info->control.rates[0].flags;
 512         skbdesc = get_skb_frame_desc(skb);
 513         memset(skbdesc, 0, sizeof(*skbdesc));
 514         skbdesc->entry = entry;
 515         skbdesc->tx_rate_idx = rate_idx;
 516         skbdesc->tx_rate_flags = rate_flags;
 517
 518         if (local)
 519                 skbdesc->flags |= SKBDESC_NOT_MAC80211;
 520
 521         /*
 522          * When hardware encryption is supported, and this frame
 523          * is to be encrypted, we should strip the IV/EIV data from
 524          * the frame so we can provide it to the driver separately.
 525          */
 526         if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
 527             !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
 528                 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
 529                         rt2x00crypto_tx_copy_iv(skb, &txdesc);
 530                 else
 531                         rt2x00crypto_tx_remove_iv(skb, &txdesc);
 532         }
 533
 534         /*
 535          * When DMA allocation is required we should guarentee to the
 536          * driver that the DMA is aligned to a 4-byte boundary.
 537          * However some drivers require L2 padding to pad the payload
 538          * rather then the header. This could be a requirement for
 539          * PCI and USB devices, while header alignment only is valid
 540          * for PCI devices.
 541          */
 542         if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
 543                 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
 544         else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
 545                 rt2x00queue_align_frame(entry->skb);
 546
 547         /*
 548          * It could be possible that the queue was corrupted and this
 549          * call failed. Since we always return NETDEV_TX_OK to mac80211,
 550          * this frame will simply be dropped.
 551          */
 552         if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
 553                 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 554                 entry->skb = NULL;
 555                 return -EIO;
 556         }
 557
 558         set_bit(ENTRY_DATA_PENDING, &entry->flags);
 559
 560         rt2x00queue_index_inc(queue, Q_INDEX);
 561         rt2x00queue_write_tx_descriptor(entry, &txdesc);
 562         rt2x00queue_kick_tx_queue(entry, &txdesc);
 563
 564         return 0;
 565 }
 566
 567 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
 568                               struct ieee80211_vif *vif,
 569                               const bool enable_beacon)
 570 {
 571         struct rt2x00_intf *intf = vif_to_intf(vif);
 572         struct skb_frame_desc *skbdesc;
 573         struct txentry_desc txdesc;
 574
 575         if (unlikely(!intf->beacon))
 576                 return -ENOBUFS;
 577
 578         mutex_lock(&intf->beacon_skb_mutex);
 579
 580         /*
 581          * Clean up the beacon skb.
 582          */
 583         rt2x00queue_free_skb(intf->beacon);
 584
 585         if (!enable_beacon) {
 586                 rt2x00dev->ops->lib->kill_tx_queue(intf->beacon->queue);
 587                 mutex_unlock(&intf->beacon_skb_mutex);
 588                 return 0;
 589         }
 590
 591         intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 592         if (!intf->beacon->skb) {
 593                 mutex_unlock(&intf->beacon_skb_mutex);
 594                 return -ENOMEM;
 595         }
 596
 597         /*
 598          * Copy all TX descriptor information into txdesc,
 599          * after that we are free to use the skb->cb array
 600          * for our information.
 601          */
 602         rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
 603
 604         /*
 605          * Fill in skb descriptor
 606          */
 607         skbdesc = get_skb_frame_desc(intf->beacon->skb);
 608         memset(skbdesc, 0, sizeof(*skbdesc));
 609         skbdesc->entry = intf->beacon;
 610
 611         /*
 612          * Send beacon to hardware and enable beacon genaration..
 613          */
 614         rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
 615
 616         mutex_unlock(&intf->beacon_skb_mutex);
 617
 618         return 0;
 619 }
 620
 621 void rt2x00queue_for_each_entry(struct data_queue *queue,
 622                                 enum queue_index start,
 623                                 enum queue_index end,
 624                                 void (*fn)(struct queue_entry *entry))
 625 {
 626         unsigned long irqflags;
 627         unsigned int index_start;
 628         unsigned int index_end;
 629         unsigned int i;
 630
 631         if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
 632                 ERROR(queue->rt2x00dev,
 633                       "Entry requested from invalid index range (%d - %d)\n",
 634                       start, end);
 635                 return;
 636         }
 637
 638         /*
 639          * Only protect the range we are going to loop over,
 640          * if during our loop a extra entry is set to pending
 641          * it should not be kicked during this run, since it
 642          * is part of another TX operation.
 643          */
 644         spin_lock_irqsave(&queue->lock, irqflags);
 645         index_start = queue->index[start];
 646         index_end = queue->index[end];
 647         spin_unlock_irqrestore(&queue->lock, irqflags);
 648
 649         /*
 650          * Start from the TX done pointer, this guarentees that we will
 651          * send out all frames in the correct order.
 652          */
 653         if (index_start < index_end) {
 654                 for (i = index_start; i < index_end; i++)
 655                         fn(&queue->entries[i]);
 656         } else {
 657                 for (i = index_start; i < queue->limit; i++)
 658                         fn(&queue->entries[i]);
 659
 660                 for (i = 0; i < index_end; i++)
 661                         fn(&queue->entries[i]);
 662         }
 663 }
 664 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
 665
 666 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
 667                                          const enum data_queue_qid queue)
 668 {
 669         int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 670
 671         if (queue == QID_RX)
 672                 return rt2x00dev->rx;
 673
 674         if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
 675                 return &rt2x00dev->tx[queue];
 676
 677         if (!rt2x00dev->bcn)
 678                 return NULL;
 679
 680         if (queue == QID_BEACON)
 681                 return &rt2x00dev->bcn[0];
 682         else if (queue == QID_ATIM && atim)
 683                 return &rt2x00dev->bcn[1];
 684
 685         return NULL;
 686 }
 687 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
 688
 689 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
 690                                           enum queue_index index)
 691 {
 692         struct queue_entry *entry;
 693         unsigned long irqflags;
 694
 695         if (unlikely(index >= Q_INDEX_MAX)) {
 696                 ERROR(queue->rt2x00dev,
 697                       "Entry requested from invalid index type (%d)\n", index);
 698                 return NULL;
 699         }
 700
 701         spin_lock_irqsave(&queue->lock, irqflags);
 702
 703         entry = &queue->entries[queue->index[index]];
 704
 705         spin_unlock_irqrestore(&queue->lock, irqflags);
 706
 707         return entry;
 708 }
 709 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
 710
 711 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
 712 {
 713         unsigned long irqflags;
 714
 715         if (unlikely(index >= Q_INDEX_MAX)) {
 716                 ERROR(queue->rt2x00dev,
 717                       "Index change on invalid index type (%d)\n", index);
 718                 return;
 719         }
 720
 721         spin_lock_irqsave(&queue->lock, irqflags);
 722
 723         queue->index[index]++;
 724         if (queue->index[index] >= queue->limit)
 725                 queue->index[index] = 0;
 726
 727         queue->last_action[index] = jiffies;
 728
 729         if (index == Q_INDEX) {
 730                 queue->length++;
 731         } else if (index == Q_INDEX_DONE) {
 732                 queue->length--;
 733                 queue->count++;
 734         }
 735
 736         spin_unlock_irqrestore(&queue->lock, irqflags);
 737 }
 738
 739 static void rt2x00queue_reset(struct data_queue *queue)
 740 {
 741         unsigned long irqflags;
 742         unsigned int i;
 743
 744         spin_lock_irqsave(&queue->lock, irqflags);
 745
 746         queue->count = 0;
 747         queue->length = 0;
 748
 749         for (i = 0; i < Q_INDEX_MAX; i++) {
 750                 queue->index[i] = 0;
 751                 queue->last_action[i] = jiffies;
 752         }
 753
 754         spin_unlock_irqrestore(&queue->lock, irqflags);
 755 }
 756
 757 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
 758 {
 759         struct data_queue *queue;
 760
 761         txall_queue_for_each(rt2x00dev, queue)
 762                 rt2x00dev->ops->lib->kill_tx_queue(queue);
 763 }
 764
 765 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
 766 {
 767         struct data_queue *queue;
 768         unsigned int i;
 769
 770         queue_for_each(rt2x00dev, queue) {
 771                 rt2x00queue_reset(queue);
 772
 773                 for (i = 0; i < queue->limit; i++) {
 774                         rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
 775                         if (queue->qid == QID_RX)
 776                                 rt2x00queue_index_inc(queue, Q_INDEX);
 777                 }
 778         }
 779 }
 780
 781 static int rt2x00queue_alloc_entries(struct data_queue *queue,
 782                                      const struct data_queue_desc *qdesc)
 783 {
 784         struct queue_entry *entries;
 785         unsigned int entry_size;
 786         unsigned int i;
 787
 788         rt2x00queue_reset(queue);
 789
 790         queue->limit = qdesc->entry_num;
 791         queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
 792         queue->data_size = qdesc->data_size;
 793         queue->desc_size = qdesc->desc_size;
 794
 795         /*
 796          * Allocate all queue entries.
 797          */
 798         entry_size = sizeof(*entries) + qdesc->priv_size;
 799         entries = kcalloc(queue->limit, entry_size, GFP_KERNEL);
 800         if (!entries)
 801                 return -ENOMEM;
 802
 803 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
 804         (((char *)(__base)) + ((__limit) * (__esize)) + \
 805             ((__index) * (__psize)))
 806
 807         for (i = 0; i < queue->limit; i++) {
 808                 entries[i].flags = 0;
 809                 entries[i].queue = queue;
 810                 entries[i].skb = NULL;
 811                 entries[i].entry_idx = i;
 812                 entries[i].priv_data =
 813                     QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
 814                                             sizeof(*entries), qdesc->priv_size);
 815         }
 816
 817 #undef QUEUE_ENTRY_PRIV_OFFSET
 818
 819         queue->entries = entries;
 820
 821         return 0;
 822 }
 823
 824 static void rt2x00queue_free_skbs(struct data_queue *queue)
 825 {
 826         unsigned int i;
 827
 828         if (!queue->entries)
 829                 return;
 830
 831         for (i = 0; i < queue->limit; i++) {
 832                 rt2x00queue_free_skb(&queue->entries[i]);
 833         }
 834 }
 835
 836 static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
 837 {
 838         unsigned int i;
 839         struct sk_buff *skb;
 840
 841         for (i = 0; i < queue->limit; i++) {
 842                 skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
 843                 if (!skb)
 844                         return -ENOMEM;
 845                 queue->entries[i].skb = skb;
 846         }
 847
 848         return 0;
 849 }
 850
 851 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
 852 {
 853         struct data_queue *queue;
 854         int status;
 855
 856         status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
 857         if (status)
 858                 goto exit;
 859
 860         tx_queue_for_each(rt2x00dev, queue) {
 861                 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
 862                 if (status)
 863                         goto exit;
 864         }
 865
 866         status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
 867         if (status)
 868                 goto exit;
 869
 870         if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
 871                 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
 872                                                    rt2x00dev->ops->atim);
 873                 if (status)
 874                         goto exit;
 875         }
 876
 877         status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx);
 878         if (status)
 879                 goto exit;
 880
 881         return 0;
 882
 883 exit:
 884         ERROR(rt2x00dev, "Queue entries allocation failed.\n");
 885
 886         rt2x00queue_uninitialize(rt2x00dev);
 887
 888         return status;
 889 }
 890
 891 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
 892 {
 893         struct data_queue *queue;
 894
 895         rt2x00queue_free_skbs(rt2x00dev->rx);
 896
 897         queue_for_each(rt2x00dev, queue) {
 898                 kfree(queue->entries);
 899                 queue->entries = NULL;
 900         }
 901 }
 902
 903 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 904                              struct data_queue *queue, enum data_queue_qid qid)
 905 {
 906         spin_lock_init(&queue->lock);
 907
 908         queue->rt2x00dev = rt2x00dev;
 909         queue->qid = qid;
 910         queue->txop = 0;
 911         queue->aifs = 2;
 912         queue->cw_min = 5;
 913         queue->cw_max = 10;
 914 }
 915
 916 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
 917 {
 918         struct data_queue *queue;
 919         enum data_queue_qid qid;
 920         unsigned int req_atim =
 921             !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 922
 923         /*
 924          * We need the following queues:
 925          * RX: 1
 926          * TX: ops->tx_queues
 927          * Beacon: 1
 928          * Atim: 1 (if required)
 929          */
 930         rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
 931
 932         queue = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL);
 933         if (!queue) {
 934                 ERROR(rt2x00dev, "Queue allocation failed.\n");
 935                 return -ENOMEM;
 936         }
 937
 938         /*
 939          * Initialize pointers
 940          */
 941         rt2x00dev->rx = queue;
 942         rt2x00dev->tx = &queue[1];
 943         rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
 944
 945         /*
 946          * Initialize queue parameters.
 947          * RX: qid = QID_RX
 948          * TX: qid = QID_AC_BE + index
 949          * TX: cw_min: 2^5 = 32.
 950          * TX: cw_max: 2^10 = 1024.
 951          * BCN: qid = QID_BEACON
 952          * ATIM: qid = QID_ATIM
 953          */
 954         rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
 955
 956         qid = QID_AC_BE;
 957         tx_queue_for_each(rt2x00dev, queue)
 958                 rt2x00queue_init(rt2x00dev, queue, qid++);
 959
 960         rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
 961         if (req_atim)
 962                 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
 963
 964         return 0;
 965 }
 966
 967 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
 968 {
 969         kfree(rt2x00dev->rx);
 970         rt2x00dev->rx = NULL;
 971         rt2x00dev->tx = NULL;
 972         rt2x00dev->bcn = NULL;
 973 }