drivers/net/wireless/ath/carl9170/tx.c

   1 /*
   2  * Atheros CARL9170 driver
   3  *
   4  * 802.11 xmit & status routines
   5  *
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, see
  21  * http://www.gnu.org/licenses/.
  22  *
  23  * This file incorporates work covered by the following copyright and
  24  * permission notice:
  25  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
  26  *
  27  *    Permission to use, copy, modify, and/or distribute this software for any
  28  *    purpose with or without fee is hereby granted, provided that the above
  29  *    copyright notice and this permission notice appear in all copies.
  30  *
  31  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  32  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  33  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  34  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  35  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  36  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  37  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  38  */
  39
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/module.h>
  43 #include <linux/etherdevice.h>
  44 #include <net/mac80211.h>
  45 #include "carl9170.h"
  46 #include "hw.h"
  47 #include "cmd.h"
  48
  49 static inline unsigned int __carl9170_get_queue(struct ar9170 *ar,
  50                                                 unsigned int queue)
  51 {
  52         if (unlikely(modparam_noht)) {
  53                 return queue;
  54         } else {
  55                 /*
  56                  * This is just another workaround, until
  57                  * someone figures out how to get QoS and
  58                  * AMPDU to play nicely together.
  59                  */
  60
  61                 return 2;               /* AC_BE */
  62         }
  63 }
  64
  65 static inline unsigned int carl9170_get_queue(struct ar9170 *ar,
  66                                               struct sk_buff *skb)
  67 {
  68         return __carl9170_get_queue(ar, skb_get_queue_mapping(skb));
  69 }
  70
  71 static bool is_mem_full(struct ar9170 *ar)
  72 {
  73         return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) >
  74                 atomic_read(&ar->mem_free_blocks));
  75 }
  76
  77 static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb)
  78 {
  79         int queue, i;
  80         bool mem_full;
  81
  82         atomic_inc(&ar->tx_total_queued);
  83
  84         queue = skb_get_queue_mapping(skb);
  85         spin_lock_bh(&ar->tx_stats_lock);
  86
  87         /*
  88          * The driver has to accept the frame, regardless if the queue is
  89          * full to the brim, or not. We have to do the queuing internally,
  90          * since mac80211 assumes that a driver which can operate with
  91          * aggregated frames does not reject frames for this reason.
  92          */
  93         ar->tx_stats[queue].len++;
  94         ar->tx_stats[queue].count++;
  95
  96         mem_full = is_mem_full(ar);
  97         for (i = 0; i < ar->hw->queues; i++) {
  98                 if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) {
  99                         ieee80211_stop_queue(ar->hw, i);
 100                         ar->queue_stop_timeout[i] = jiffies;
 101                 }
 102         }
 103
 104         spin_unlock_bh(&ar->tx_stats_lock);
 105 }
 106
 107 static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
 108 {
 109         struct ieee80211_tx_info *txinfo;
 110         int queue;
 111
 112         txinfo = IEEE80211_SKB_CB(skb);
 113         queue = skb_get_queue_mapping(skb);
 114
 115         spin_lock_bh(&ar->tx_stats_lock);
 116
 117         ar->tx_stats[queue].len--;
 118
 119         if (!is_mem_full(ar)) {
 120                 unsigned int i;
 121                 for (i = 0; i < ar->hw->queues; i++) {
 122                         if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)
 123                                 continue;
 124
 125                         if (ieee80211_queue_stopped(ar->hw, i)) {
 126                                 unsigned long tmp;
 127
 128                                 tmp = jiffies - ar->queue_stop_timeout[i];
 129                                 if (tmp > ar->max_queue_stop_timeout[i])
 130                                         ar->max_queue_stop_timeout[i] = tmp;
 131                         }
 132
 133                         ieee80211_wake_queue(ar->hw, i);
 134                 }
 135         }
 136
 137         spin_unlock_bh(&ar->tx_stats_lock);
 138         if (atomic_dec_and_test(&ar->tx_total_queued))
 139                 complete(&ar->tx_flush);
 140 }
 141
 142 static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 143 {
 144         struct _carl9170_tx_superframe *super = (void *) skb->data;
 145         unsigned int chunks;
 146         int cookie = -1;
 147
 148         atomic_inc(&ar->mem_allocs);
 149
 150         chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);
 151         if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {
 152                 atomic_add(chunks, &ar->mem_free_blocks);
 153                 return -ENOSPC;
 154         }
 155
 156         spin_lock_bh(&ar->mem_lock);
 157         cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0);
 158         spin_unlock_bh(&ar->mem_lock);
 159
 160         if (unlikely(cookie < 0)) {
 161                 atomic_add(chunks, &ar->mem_free_blocks);
 162                 return -ENOSPC;
 163         }
 164
 165         super = (void *) skb->data;
 166
 167         /*
 168          * Cookie #0 serves two special purposes:
 169          *  1. The firmware might use it generate BlockACK frames
 170          *     in responds of an incoming BlockAckReqs.
 171          *
 172          *  2. Prevent double-free bugs.
 173          */
 174         super->s.cookie = (u8) cookie + 1;
 175         return 0;
 176 }
 177
 178 static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 179 {
 180         struct _carl9170_tx_superframe *super = (void *) skb->data;
 181         int cookie;
 182
 183         /* make a local copy of the cookie */
 184         cookie = super->s.cookie;
 185         /* invalidate cookie */
 186         super->s.cookie = 0;
 187
 188         /*
 189          * Do a out-of-bounds check on the cookie:
 190          *
 191          *  * cookie "0" is reserved and won't be assigned to any
 192          *    out-going frame. Internally however, it is used to
 193          *    mark no longer/un-accounted frames and serves as a
 194          *    cheap way of preventing frames from being freed
 195          *    twice by _accident_. NB: There is a tiny race...
 196          *
 197          *  * obviously, cookie number is limited by the amount
 198          *    of available memory blocks, so the number can
 199          *    never execeed the mem_blocks count.
 200          */
 201         if (unlikely(WARN_ON_ONCE(cookie == 0) ||
 202             WARN_ON_ONCE(cookie > ar->fw.mem_blocks)))
 203                 return;
 204
 205         atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),
 206                    &ar->mem_free_blocks);
 207
 208         spin_lock_bh(&ar->mem_lock);
 209         bitmap_release_region(ar->mem_bitmap, cookie - 1, 0);
 210         spin_unlock_bh(&ar->mem_lock);
 211 }
 212
 213 /* Called from any context */
 214 static void carl9170_tx_release(struct kref *ref)
 215 {
 216         struct ar9170 *ar;
 217         struct carl9170_tx_info *arinfo;
 218         struct ieee80211_tx_info *txinfo;
 219         struct sk_buff *skb;
 220
 221         arinfo = container_of(ref, struct carl9170_tx_info, ref);
 222         txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,
 223                               rate_driver_data);
 224         skb = container_of((void *) txinfo, struct sk_buff, cb);
 225
 226         ar = arinfo->ar;
 227         if (WARN_ON_ONCE(!ar))
 228                 return;
 229
 230         BUILD_BUG_ON(
 231             offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
 232
 233         memset(&txinfo->status.ampdu_ack_len, 0,
 234                sizeof(struct ieee80211_tx_info) -
 235                offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
 236
 237         if (atomic_read(&ar->tx_total_queued))
 238                 ar->tx_schedule = true;
 239
 240         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {
 241                 if (!atomic_read(&ar->tx_ampdu_upload))
 242                         ar->tx_ampdu_schedule = true;
 243
 244                 if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {
 245                         struct _carl9170_tx_superframe *super;
 246
 247                         super = (void *)skb->data;
 248                         txinfo->status.ampdu_len = super->s.rix;
 249                         txinfo->status.ampdu_ack_len = super->s.cnt;
 250                 } else if (txinfo->flags & IEEE80211_TX_STAT_ACK) {
 251                         /*
 252                          * drop redundant tx_status reports:
 253                          *
 254                          * 1. ampdu_ack_len of the final tx_status does
 255                          *    include the feedback of this particular frame.
 256                          *
 257                          * 2. tx_status_irqsafe only queues up to 128
 258                          *    tx feedback reports and discards the rest.
 259                          *
 260                          * 3. minstrel_ht is picky, it only accepts
 261                          *    reports of frames with the TX_STATUS_AMPDU flag.
 262                          */
 263
 264                         dev_kfree_skb_any(skb);
 265                         return;
 266                 } else {
 267                         /*
 268                          * Frame has failed, but we want to keep it in
 269                          * case it was lost due to a power-state
 270                          * transition.
 271                          */
 272                 }
 273         }
 274
 275         skb_pull(skb, sizeof(struct _carl9170_tx_superframe));
 276         ieee80211_tx_status_irqsafe(ar->hw, skb);
 277 }
 278
 279 void carl9170_tx_get_skb(struct sk_buff *skb)
 280 {
 281         struct carl9170_tx_info *arinfo = (void *)
 282                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 283         kref_get(&arinfo->ref);
 284 }
 285
 286 int carl9170_tx_put_skb(struct sk_buff *skb)
 287 {
 288         struct carl9170_tx_info *arinfo = (void *)
 289                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 290
 291         return kref_put(&arinfo->ref, carl9170_tx_release);
 292 }
 293
 294 /* Caller must hold the tid_info->lock & rcu_read_lock */
 295 static void carl9170_tx_shift_bm(struct ar9170 *ar,
 296         struct carl9170_sta_tid *tid_info, u16 seq)
 297 {
 298         u16 off;
 299
 300         off = SEQ_DIFF(seq, tid_info->bsn);
 301
 302         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 303                 return;
 304
 305         /*
 306          * Sanity check. For each MPDU we set the bit in bitmap and
 307          * clear it once we received the tx_status.
 308          * But if the bit is already cleared then we've been bitten
 309          * by a bug.
 310          */
 311         WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
 312
 313         off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
 314         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 315                 return;
 316
 317         if (!bitmap_empty(tid_info->bitmap, off))
 318                 off = find_first_bit(tid_info->bitmap, off);
 319
 320         tid_info->bsn += off;
 321         tid_info->bsn &= 0x0fff;
 322
 323         bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,
 324                            off, CARL9170_BAW_BITS);
 325 }
 326
 327 static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
 328         struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
 329 {
 330         struct _carl9170_tx_superframe *super = (void *) skb->data;
 331         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 332         struct ieee80211_tx_info *tx_info;
 333         struct carl9170_tx_info *ar_info;
 334         struct carl9170_sta_info *sta_info;
 335         struct ieee80211_sta *sta;
 336         struct carl9170_sta_tid *tid_info;
 337         struct ieee80211_vif *vif;
 338         unsigned int vif_id;
 339         u8 tid;
 340
 341         if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
 342             txinfo->flags & IEEE80211_TX_CTL_INJECTED ||
 343            (!(super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_AGGR))))
 344                 return;
 345
 346         tx_info = IEEE80211_SKB_CB(skb);
 347         ar_info = (void *) tx_info->rate_driver_data;
 348
 349         vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
 350                  CARL9170_TX_SUPER_MISC_VIF_ID_S;
 351
 352         if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))
 353                 return;
 354
 355         rcu_read_lock();
 356         vif = rcu_dereference(ar->vif_priv[vif_id].vif);
 357         if (unlikely(!vif))
 358                 goto out_rcu;
 359
 360         /*
 361          * Normally we should use wrappers like ieee80211_get_DA to get
 362          * the correct peer ieee80211_sta.
 363          *
 364          * But there is a problem with indirect traffic (broadcasts, or
 365          * data which is designated for other stations) in station mode.
 366          * The frame will be directed to the AP for distribution and not
 367          * to the actual destination.
 368          */
 369         sta = ieee80211_find_sta(vif, hdr->addr1);
 370         if (unlikely(!sta))
 371                 goto out_rcu;
 372
 373         tid = get_tid_h(hdr);
 374
 375         sta_info = (void *) sta->drv_priv;
 376         tid_info = rcu_dereference(sta_info->agg[tid]);
 377         if (!tid_info)
 378                 goto out_rcu;
 379
 380         spin_lock_bh(&tid_info->lock);
 381         if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
 382                 carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));
 383
 384         if (sta_info->stats[tid].clear) {
 385                 sta_info->stats[tid].clear = false;
 386                 sta_info->stats[tid].ampdu_len = 0;
 387                 sta_info->stats[tid].ampdu_ack_len = 0;
 388         }
 389
 390         sta_info->stats[tid].ampdu_len++;
 391         if (txinfo->status.rates[0].count == 1)
 392                 sta_info->stats[tid].ampdu_ack_len++;
 393
 394         if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
 395                 super->s.rix = sta_info->stats[tid].ampdu_len;
 396                 super->s.cnt = sta_info->stats[tid].ampdu_ack_len;
 397                 txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
 398                 sta_info->stats[tid].clear = true;
 399         }
 400         spin_unlock_bh(&tid_info->lock);
 401
 402 out_rcu:
 403         rcu_read_unlock();
 404 }
 405
 406 void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
 407                         const bool success)
 408 {
 409         struct ieee80211_tx_info *txinfo;
 410
 411         carl9170_tx_accounting_free(ar, skb);
 412
 413         txinfo = IEEE80211_SKB_CB(skb);
 414
 415         if (success)
 416                 txinfo->flags |= IEEE80211_TX_STAT_ACK;
 417         else
 418                 ar->tx_ack_failures++;
 419
 420         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 421                 carl9170_tx_status_process_ampdu(ar, skb, txinfo);
 422
 423         carl9170_tx_put_skb(skb);
 424 }
 425
 426 /* This function may be called form any context */
 427 void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
 428 {
 429         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 430
 431         atomic_dec(&ar->tx_total_pending);
 432
 433         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 434                 atomic_dec(&ar->tx_ampdu_upload);
 435
 436         if (carl9170_tx_put_skb(skb))
 437                 tasklet_hi_schedule(&ar->usb_tasklet);
 438 }
 439
 440 static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
 441                                                struct sk_buff_head *queue)
 442 {
 443         struct sk_buff *skb;
 444
 445         spin_lock_bh(&queue->lock);
 446         skb_queue_walk(queue, skb) {
 447                 struct _carl9170_tx_superframe *txc = (void *) skb->data;
 448
 449                 if (txc->s.cookie != cookie)
 450                         continue;
 451
 452                 __skb_unlink(skb, queue);
 453                 spin_unlock_bh(&queue->lock);
 454
 455                 carl9170_release_dev_space(ar, skb);
 456                 return skb;
 457         }
 458         spin_unlock_bh(&queue->lock);
 459
 460         return NULL;
 461 }
 462
 463 static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
 464         unsigned int tries, struct ieee80211_tx_info *txinfo)
 465 {
 466         unsigned int i;
 467
 468         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 469                 if (txinfo->status.rates[i].idx < 0)
 470                         break;
 471
 472                 if (i == rix) {
 473                         txinfo->status.rates[i].count = tries;
 474                         i++;
 475                         break;
 476                 }
 477         }
 478
 479         for (; i < IEEE80211_TX_MAX_RATES; i++) {
 480                 txinfo->status.rates[i].idx = -1;
 481                 txinfo->status.rates[i].count = 0;
 482         }
 483 }
 484
 485 static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
 486 {
 487         int i;
 488         struct sk_buff *skb;
 489         struct ieee80211_tx_info *txinfo;
 490         struct carl9170_tx_info *arinfo;
 491         bool restart = false;
 492
 493         for (i = 0; i < ar->hw->queues; i++) {
 494                 spin_lock_bh(&ar->tx_status[i].lock);
 495
 496                 skb = skb_peek(&ar->tx_status[i]);
 497
 498                 if (!skb)
 499                         goto next;
 500
 501                 txinfo = IEEE80211_SKB_CB(skb);
 502                 arinfo = (void *) txinfo->rate_driver_data;
 503
 504                 if (time_is_before_jiffies(arinfo->timeout +
 505                     msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
 506                         restart = true;
 507
 508 next:
 509                 spin_unlock_bh(&ar->tx_status[i].lock);
 510         }
 511
 512         if (restart) {
 513                 /*
 514                  * At least one queue has been stuck for long enough.
 515                  * Give the device a kick and hope it gets back to
 516                  * work.
 517                  *
 518                  * possible reasons may include:
 519                  *  - frames got lost/corrupted (bad connection to the device)
 520                  *  - stalled rx processing/usb controller hiccups
 521                  *  - firmware errors/bugs
 522                  *  - every bug you can think of.
 523                  *  - all bugs you can't...
 524                  *  - ...
 525                  */
 526                 carl9170_restart(ar, CARL9170_RR_STUCK_TX);
 527         }
 528 }
 529
 530 static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)
 531 {
 532         struct carl9170_sta_tid *iter;
 533         struct sk_buff *skb;
 534         struct ieee80211_tx_info *txinfo;
 535         struct carl9170_tx_info *arinfo;
 536         struct _carl9170_tx_superframe *super;
 537         struct ieee80211_sta *sta;
 538         struct ieee80211_vif *vif;
 539         struct ieee80211_hdr *hdr;
 540         unsigned int vif_id;
 541
 542         rcu_read_lock();
 543         list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {
 544                 if (iter->state < CARL9170_TID_STATE_IDLE)
 545                         continue;
 546
 547                 spin_lock_bh(&iter->lock);
 548                 skb = skb_peek(&iter->queue);
 549                 if (!skb)
 550                         goto unlock;
 551
 552                 txinfo = IEEE80211_SKB_CB(skb);
 553                 arinfo = (void *)txinfo->rate_driver_data;
 554                 if (time_is_after_jiffies(arinfo->timeout +
 555                     msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))
 556                         goto unlock;
 557
 558                 super = (void *) skb->data;
 559                 hdr = (void *) super->frame_data;
 560
 561                 vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
 562                          CARL9170_TX_SUPER_MISC_VIF_ID_S;
 563
 564                 if (WARN_ON(vif_id >= AR9170_MAX_VIRTUAL_MAC))
 565                         goto unlock;
 566
 567                 vif = rcu_dereference(ar->vif_priv[vif_id].vif);
 568                 if (WARN_ON(!vif))
 569                         goto unlock;
 570
 571                 sta = ieee80211_find_sta(vif, hdr->addr1);
 572                 if (WARN_ON(!sta))
 573                         goto unlock;
 574
 575                 ieee80211_stop_tx_ba_session(sta, iter->tid);
 576 unlock:
 577                 spin_unlock_bh(&iter->lock);
 578
 579         }
 580         rcu_read_unlock();
 581 }
 582
 583 void carl9170_tx_janitor(struct work_struct *work)
 584 {
 585         struct ar9170 *ar = container_of(work, struct ar9170,
 586                                          tx_janitor.work);
 587         if (!IS_STARTED(ar))
 588                 return;
 589
 590         ar->tx_janitor_last_run = jiffies;
 591
 592         carl9170_check_queue_stop_timeout(ar);
 593         carl9170_tx_ampdu_timeout(ar);
 594
 595         if (!atomic_read(&ar->tx_total_queued))
 596                 return;
 597
 598         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
 599                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
 600 }
 601
 602 static void __carl9170_tx_process_status(struct ar9170 *ar,
 603         const uint8_t cookie, const uint8_t info)
 604 {
 605         struct sk_buff *skb;
 606         struct ieee80211_tx_info *txinfo;
 607         struct carl9170_tx_info *arinfo;
 608         unsigned int r, t, q;
 609         bool success = true;
 610
 611         q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE];
 612
 613         skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);
 614         if (!skb) {
 615                 /*
 616                  * We have lost the race to another thread.
 617                  */
 618
 619                 return ;
 620         }
 621
 622         txinfo = IEEE80211_SKB_CB(skb);
 623         arinfo = (void *) txinfo->rate_driver_data;
 624
 625         if (!(info & CARL9170_TX_STATUS_SUCCESS))
 626                 success = false;
 627
 628         r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
 629         t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
 630
 631         carl9170_tx_fill_rateinfo(ar, r, t, txinfo);
 632         carl9170_tx_status(ar, skb, success);
 633 }
 634
 635 void carl9170_tx_process_status(struct ar9170 *ar,
 636                                 const struct carl9170_rsp *cmd)
 637 {
 638         unsigned int i;
 639
 640         for (i = 0;  i < cmd->hdr.ext; i++) {
 641                 if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
 642                         print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
 643                                              (void *) cmd, cmd->hdr.len + 4);
 644                         break;
 645                 }
 646
 647                 __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,
 648                                              cmd->_tx_status[i].info);
 649         }
 650 }
 651
 652 static __le32 carl9170_tx_physet(struct ar9170 *ar,
 653         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
 654 {
 655         struct ieee80211_rate *rate = NULL;
 656         u32 power, chains;
 657         __le32 tmp;
 658
 659         tmp = cpu_to_le32(0);
 660
 661         if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 662                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
 663                         AR9170_TX_PHY_BW_S);
 664         /* this works because 40 MHz is 2 and dup is 3 */
 665         if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
 666                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
 667                         AR9170_TX_PHY_BW_S);
 668
 669         if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
 670                 tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
 671
 672         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 673                 u32 r = txrate->idx;
 674                 u8 *txpower;
 675
 676                 /* heavy clip control */
 677                 tmp |= cpu_to_le32((r & 0x7) <<
 678                         AR9170_TX_PHY_TX_HEAVY_CLIP_S);
 679
 680                 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
 681                         if (info->band == IEEE80211_BAND_5GHZ)
 682                                 txpower = ar->power_5G_ht40;
 683                         else
 684                                 txpower = ar->power_2G_ht40;
 685                 } else {
 686                         if (info->band == IEEE80211_BAND_5GHZ)
 687                                 txpower = ar->power_5G_ht20;
 688                         else
 689                                 txpower = ar->power_2G_ht20;
 690                 }
 691
 692                 power = txpower[r & 7];
 693
 694                 /* +1 dBm for HT40 */
 695                 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 696                         power += 2;
 697
 698                 r <<= AR9170_TX_PHY_MCS_S;
 699                 BUG_ON(r & ~AR9170_TX_PHY_MCS);
 700
 701                 tmp |= cpu_to_le32(r & AR9170_TX_PHY_MCS);
 702                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
 703
 704                 /*
 705                  * green field preamble does not work.
 706                  *
 707                  * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
 708                  * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
 709                  */
 710         } else {
 711                 u8 *txpower;
 712                 u32 mod;
 713                 u32 phyrate;
 714                 u8 idx = txrate->idx;
 715
 716                 if (info->band != IEEE80211_BAND_2GHZ) {
 717                         idx += 4;
 718                         txpower = ar->power_5G_leg;
 719                         mod = AR9170_TX_PHY_MOD_OFDM;
 720                 } else {
 721                         if (idx < 4) {
 722                                 txpower = ar->power_2G_cck;
 723                                 mod = AR9170_TX_PHY_MOD_CCK;
 724                         } else {
 725                                 mod = AR9170_TX_PHY_MOD_OFDM;
 726                                 txpower = ar->power_2G_ofdm;
 727                         }
 728                 }
 729
 730                 rate = &__carl9170_ratetable[idx];
 731
 732                 phyrate = rate->hw_value & 0xF;
 733                 power = txpower[(rate->hw_value & 0x30) >> 4];
 734                 phyrate <<= AR9170_TX_PHY_MCS_S;
 735
 736                 tmp |= cpu_to_le32(mod);
 737                 tmp |= cpu_to_le32(phyrate);
 738
 739                 /*
 740                  * short preamble seems to be broken too.
 741                  *
 742                  * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 743                  *      tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
 744                  */
 745         }
 746         power <<= AR9170_TX_PHY_TX_PWR_S;
 747         power &= AR9170_TX_PHY_TX_PWR;
 748         tmp |= cpu_to_le32(power);
 749
 750         /* set TX chains */
 751         if (ar->eeprom.tx_mask == 1) {
 752                 chains = AR9170_TX_PHY_TXCHAIN_1;
 753         } else {
 754                 chains = AR9170_TX_PHY_TXCHAIN_2;
 755
 756                 /* >= 36M legacy OFDM - use only one chain */
 757                 if (rate && rate->bitrate >= 360 &&
 758                     !(txrate->flags & IEEE80211_TX_RC_MCS))
 759                         chains = AR9170_TX_PHY_TXCHAIN_1;
 760         }
 761         tmp |= cpu_to_le32(chains << AR9170_TX_PHY_TXCHAIN_S);
 762
 763         return tmp;
 764 }
 765
 766 static bool carl9170_tx_rts_check(struct ar9170 *ar,
 767                                   struct ieee80211_tx_rate *rate,
 768                                   bool ampdu, bool multi)
 769 {
 770         switch (ar->erp_mode) {
 771         case CARL9170_ERP_AUTO:
 772                 if (ampdu)
 773                         break;
 774
 775         case CARL9170_ERP_MAC80211:
 776                 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
 777                         break;
 778
 779         case CARL9170_ERP_RTS:
 780                 if (likely(!multi))
 781                         return true;
 782
 783         default:
 784                 break;
 785         }
 786
 787         return false;
 788 }
 789
 790 static bool carl9170_tx_cts_check(struct ar9170 *ar,
 791                                   struct ieee80211_tx_rate *rate)
 792 {
 793         switch (ar->erp_mode) {
 794         case CARL9170_ERP_AUTO:
 795         case CARL9170_ERP_MAC80211:
 796                 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 797                         break;
 798
 799         case CARL9170_ERP_CTS:
 800                 return true;
 801
 802         default:
 803                 break;
 804         }
 805
 806         return false;
 807 }
 808
 809 static int carl9170_tx_prepare(struct ar9170 *ar, struct sk_buff *skb)
 810 {
 811         struct ieee80211_hdr *hdr;
 812         struct _carl9170_tx_superframe *txc;
 813         struct carl9170_vif_info *cvif;
 814         struct ieee80211_tx_info *info;
 815         struct ieee80211_tx_rate *txrate;
 816         struct ieee80211_sta *sta;
 817         struct carl9170_tx_info *arinfo;
 818         unsigned int hw_queue;
 819         int i;
 820         __le16 mac_tmp;
 821         u16 len;
 822         bool ampdu, no_ack;
 823
 824         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
 825         BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
 826                      CARL9170_TX_SUPERDESC_LEN);
 827
 828         BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
 829                      AR9170_TX_HWDESC_LEN);
 830
 831         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
 832
 833         BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
 834                 ((CARL9170_TX_SUPER_MISC_VIF_ID >>
 835                  CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
 836
 837         hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
 838
 839         hdr = (void *)skb->data;
 840         info = IEEE80211_SKB_CB(skb);
 841         len = skb->len;
 842
 843         /*
 844          * Note: If the frame was sent through a monitor interface,
 845          * the ieee80211_vif pointer can be NULL.
 846          */
 847         if (likely(info->control.vif))
 848                 cvif = (void *) info->control.vif->drv_priv;
 849         else
 850                 cvif = NULL;
 851
 852         sta = info->control.sta;
 853
 854         txc = (void *)skb_push(skb, sizeof(*txc));
 855         memset(txc, 0, sizeof(*txc));
 856
 857         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
 858
 859         if (likely(cvif))
 860                 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
 861
 862         if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
 863                 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
 864
 865         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
 866                 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
 867
 868         mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
 869                               AR9170_TX_MAC_BACKOFF);
 870         mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
 871                                AR9170_TX_MAC_QOS);
 872
 873         no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
 874         if (unlikely(no_ack))
 875                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
 876
 877         if (info->control.hw_key) {
 878                 len += info->control.hw_key->icv_len;
 879
 880                 switch (info->control.hw_key->cipher) {
 881                 case WLAN_CIPHER_SUITE_WEP40:
 882                 case WLAN_CIPHER_SUITE_WEP104:
 883                 case WLAN_CIPHER_SUITE_TKIP:
 884                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
 885                         break;
 886                 case WLAN_CIPHER_SUITE_CCMP:
 887                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
 888                         break;
 889                 default:
 890                         WARN_ON(1);
 891                         goto err_out;
 892                 }
 893         }
 894
 895         ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
 896         if (ampdu) {
 897                 unsigned int density, factor;
 898
 899                 if (unlikely(!sta || !cvif))
 900                         goto err_out;
 901
 902                 factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor);
 903                 density = sta->ht_cap.ampdu_density;
 904
 905                 if (density) {
 906                         /*
 907                          * Watch out!
 908                          *
 909                          * Otus uses slightly different density values than
 910                          * those from the 802.11n spec.
 911                          */
 912
 913                         density = max_t(unsigned int, density + 1, 7u);
 914                 }
 915
 916                 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
 917                         txc->s.ampdu_settings, density);
 918
 919                 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
 920                         txc->s.ampdu_settings, factor);
 921
 922                 for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
 923                         txrate = &info->control.rates[i];
 924                         if (txrate->idx >= 0) {
 925                                 txc->s.ri[i] =
 926                                         CARL9170_TX_SUPER_RI_AMPDU;
 927
 928                                 if (WARN_ON(!(txrate->flags &
 929                                               IEEE80211_TX_RC_MCS))) {
 930                                         /*
 931                                          * Not sure if it's even possible
 932                                          * to aggregate non-ht rates with
 933                                          * this HW.
 934                                          */
 935                                         goto err_out;
 936                                 }
 937                                 continue;
 938                         }
 939
 940                         txrate->idx = 0;
 941                         txrate->count = ar->hw->max_rate_tries;
 942                 }
 943
 944                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
 945         }
 946
 947         /*
 948          * NOTE: For the first rate, the ERP & AMPDU flags are directly
 949          * taken from mac_control. For all fallback rate, the firmware
 950          * updates the mac_control flags from the rate info field.
 951          */
 952         for (i = 1; i < CARL9170_TX_MAX_RATES; i++) {
 953                 txrate = &info->control.rates[i];
 954                 if (txrate->idx < 0)
 955                         break;
 956
 957                 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
 958                         txrate->count);
 959
 960                 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 961                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
 962                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 963                 else if (carl9170_tx_cts_check(ar, txrate))
 964                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
 965                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 966
 967                 txc->s.rr[i - 1] = carl9170_tx_physet(ar, info, txrate);
 968         }
 969
 970         txrate = &info->control.rates[0];
 971         SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[0], txrate->count);
 972
 973         if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 974                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
 975         else if (carl9170_tx_cts_check(ar, txrate))
 976                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
 977
 978         txc->s.len = cpu_to_le16(skb->len);
 979         txc->f.length = cpu_to_le16(len + FCS_LEN);
 980         txc->f.mac_control = mac_tmp;
 981         txc->f.phy_control = carl9170_tx_physet(ar, info, txrate);
 982
 983         arinfo = (void *)info->rate_driver_data;
 984         arinfo->timeout = jiffies;
 985         arinfo->ar = ar;
 986         kref_init(&arinfo->ref);
 987         return 0;
 988
 989 err_out:
 990         skb_pull(skb, sizeof(*txc));
 991         return -EINVAL;
 992 }
 993
 994 static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
 995 {
 996         struct _carl9170_tx_superframe *super;
 997
 998         super = (void *) skb->data;
 999         super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1000 }
1001
1002 static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1003 {
1004         struct _carl9170_tx_superframe *super;
1005         int tmp;
1006
1007         super = (void *) skb->data;
1008
1009         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1010                 CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1011
1012         /*
1013          * If you haven't noticed carl9170_tx_prepare has already filled
1014          * in all ampdu spacing & factor parameters.
1015          * Now it's the time to check whenever the settings have to be
1016          * updated by the firmware, or if everything is still the same.
1017          *
1018          * There's no sane way to handle different density values with
1019          * this hardware, so we may as well just do the compare in the
1020          * driver.
1021          */
1022
1023         if (tmp != ar->current_density) {
1024                 ar->current_density = tmp;
1025                 super->s.ampdu_settings |=
1026                         CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1027         }
1028
1029         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1030                 CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1031
1032         if (tmp != ar->current_factor) {
1033                 ar->current_factor = tmp;
1034                 super->s.ampdu_settings |=
1035                         CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1036         }
1037 }
1038
1039 static bool carl9170_tx_rate_check(struct ar9170 *ar, struct sk_buff *_dest,
1040                                    struct sk_buff *_src)
1041 {
1042         struct _carl9170_tx_superframe *dest, *src;
1043
1044         dest = (void *) _dest->data;
1045         src = (void *) _src->data;
1046
1047         /*
1048          * The mac80211 rate control algorithm expects that all MPDUs in
1049          * an AMPDU share the same tx vectors.
1050          * This is not really obvious right now, because the hardware
1051          * does the AMPDU setup according to its own rulebook.
1052          * Our nicely assembled, strictly monotonic increasing mpdu
1053          * chains will be broken up, mashed back together...
1054          */
1055
1056         return (dest->f.phy_control == src->f.phy_control);
1057 }
1058
1059 static void carl9170_tx_ampdu(struct ar9170 *ar)
1060 {
1061         struct sk_buff_head agg;
1062         struct carl9170_sta_tid *tid_info;
1063         struct sk_buff *skb, *first;
1064         unsigned int i = 0, done_ampdus = 0;
1065         u16 seq, queue, tmpssn;
1066
1067         atomic_inc(&ar->tx_ampdu_scheduler);
1068         ar->tx_ampdu_schedule = false;
1069
1070         if (atomic_read(&ar->tx_ampdu_upload))
1071                 return;
1072
1073         if (!ar->tx_ampdu_list_len)
1074                 return;
1075
1076         __skb_queue_head_init(&agg);
1077
1078         rcu_read_lock();
1079         tid_info = rcu_dereference(ar->tx_ampdu_iter);
1080         if (WARN_ON_ONCE(!tid_info)) {
1081                 rcu_read_unlock();
1082                 return;
1083         }
1084
1085 retry:
1086         list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1087                 i++;
1088
1089                 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1090                         continue;
1091
1092                 queue = TID_TO_WME_AC(tid_info->tid);
1093
1094                 spin_lock_bh(&tid_info->lock);
1095                 if (tid_info->state != CARL9170_TID_STATE_XMIT)
1096                         goto processed;
1097
1098                 tid_info->counter++;
1099                 first = skb_peek(&tid_info->queue);
1100                 tmpssn = carl9170_get_seq(first);
1101                 seq = tid_info->snx;
1102
1103                 if (unlikely(tmpssn != seq)) {
1104                         tid_info->state = CARL9170_TID_STATE_IDLE;
1105
1106                         goto processed;
1107                 }
1108
1109                 while ((skb = skb_peek(&tid_info->queue))) {
1110                         /* strict 0, 1, ..., n - 1, n frame sequence order */
1111                         if (unlikely(carl9170_get_seq(skb) != seq))
1112                                 break;
1113
1114                         /* don't upload more than AMPDU FACTOR allows. */
1115                         if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1116                             (tid_info->max - 1)))
1117                                 break;
1118
1119                         if (!carl9170_tx_rate_check(ar, skb, first))
1120                                 break;
1121
1122                         atomic_inc(&ar->tx_ampdu_upload);
1123                         tid_info->snx = seq = SEQ_NEXT(seq);
1124                         __skb_unlink(skb, &tid_info->queue);
1125
1126                         __skb_queue_tail(&agg, skb);
1127
1128                         if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
1129                                 break;
1130                 }
1131
1132                 if (skb_queue_empty(&tid_info->queue) ||
1133                     carl9170_get_seq(skb_peek(&tid_info->queue)) !=
1134                     tid_info->snx) {
1135                         /*
1136                          * stop TID, if A-MPDU frames are still missing,
1137                          * or whenever the queue is empty.
1138                          */
1139
1140                         tid_info->state = CARL9170_TID_STATE_IDLE;
1141                 }
1142                 done_ampdus++;
1143
1144 processed:
1145                 spin_unlock_bh(&tid_info->lock);
1146
1147                 if (skb_queue_empty(&agg))
1148                         continue;
1149
1150                 /* apply ampdu spacing & factor settings */
1151                 carl9170_set_ampdu_params(ar, skb_peek(&agg));
1152
1153                 /* set aggregation push bit */
1154                 carl9170_set_immba(ar, skb_peek_tail(&agg));
1155
1156                 spin_lock_bh(&ar->tx_pending[queue].lock);
1157                 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
1158                 spin_unlock_bh(&ar->tx_pending[queue].lock);
1159                 ar->tx_schedule = true;
1160         }
1161         if ((done_ampdus++ == 0) && (i++ == 0))
1162                 goto retry;
1163
1164         rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1165         rcu_read_unlock();
1166 }
1167
1168 static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1169                                             struct sk_buff_head *queue)
1170 {
1171         struct sk_buff *skb;
1172         struct ieee80211_tx_info *info;
1173         struct carl9170_tx_info *arinfo;
1174
1175         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1176
1177         spin_lock_bh(&queue->lock);
1178         skb = skb_peek(queue);
1179         if (unlikely(!skb))
1180                 goto err_unlock;
1181
1182         if (carl9170_alloc_dev_space(ar, skb))
1183                 goto err_unlock;
1184
1185         __skb_unlink(skb, queue);
1186         spin_unlock_bh(&queue->lock);
1187
1188         info = IEEE80211_SKB_CB(skb);
1189         arinfo = (void *) info->rate_driver_data;
1190
1191         arinfo->timeout = jiffies;
1192
1193         /*
1194          * increase ref count to "2".
1195          * Ref counting is the easiest way to solve the race between
1196          * the the urb's completion routine: carl9170_tx_callback and
1197          * wlan tx status functions: carl9170_tx_status/janitor.
1198          */
1199         carl9170_tx_get_skb(skb);
1200
1201         return skb;
1202
1203 err_unlock:
1204         spin_unlock_bh(&queue->lock);
1205         return NULL;
1206 }
1207
1208 void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1209 {
1210         struct _carl9170_tx_superframe *super;
1211         uint8_t q = 0;
1212
1213         ar->tx_dropped++;
1214
1215         super = (void *)skb->data;
1216         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1217                 ar9170_qmap[carl9170_get_queue(ar, skb)]);
1218         __carl9170_tx_process_status(ar, super->s.cookie, q);
1219 }
1220
1221 static void carl9170_tx(struct ar9170 *ar)
1222 {
1223         struct sk_buff *skb;
1224         unsigned int i, q;
1225         bool schedule_garbagecollector = false;
1226
1227         ar->tx_schedule = false;
1228
1229         if (unlikely(!IS_STARTED(ar)))
1230                 return;
1231
1232         carl9170_usb_handle_tx_err(ar);
1233
1234         for (i = 0; i < ar->hw->queues; i++) {
1235                 while (!skb_queue_empty(&ar->tx_pending[i])) {
1236                         skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
1237                         if (unlikely(!skb))
1238                                 break;
1239
1240                         atomic_inc(&ar->tx_total_pending);
1241
1242                         q = __carl9170_get_queue(ar, i);
1243                         /*
1244                          * NB: tx_status[i] vs. tx_status[q],
1245                          * TODO: Move into pick_skb or alloc_dev_space.
1246                          */
1247                         skb_queue_tail(&ar->tx_status[q], skb);
1248
1249                         carl9170_usb_tx(ar, skb);
1250                         schedule_garbagecollector = true;
1251                 }
1252         }
1253
1254         if (!schedule_garbagecollector)
1255                 return;
1256
1257         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
1258                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1259 }
1260
1261 static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1262         struct ieee80211_sta *sta, struct sk_buff *skb)
1263 {
1264         struct _carl9170_tx_superframe *super = (void *) skb->data;
1265         struct carl9170_sta_info *sta_info;
1266         struct carl9170_sta_tid *agg;
1267         struct sk_buff *iter;
1268         unsigned int max;
1269         u16 tid, seq, qseq, off;
1270         bool run = false;
1271
1272         tid = carl9170_get_tid(skb);
1273         seq = carl9170_get_seq(skb);
1274         sta_info = (void *) sta->drv_priv;
1275
1276         rcu_read_lock();
1277         agg = rcu_dereference(sta_info->agg[tid]);
1278         max = sta_info->ampdu_max_len;
1279
1280         if (!agg)
1281                 goto err_unlock_rcu;
1282
1283         spin_lock_bh(&agg->lock);
1284         if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1285                 goto err_unlock;
1286
1287         /* check if sequence is within the BA window */
1288         if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1289                 goto err_unlock;
1290
1291         if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1292                 goto err_unlock;
1293
1294         off = SEQ_DIFF(seq, agg->bsn);
1295         if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1296                 goto err_unlock;
1297
1298         if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1299                 __skb_queue_tail(&agg->queue, skb);
1300                 agg->hsn = seq;
1301                 goto queued;
1302         }
1303
1304         skb_queue_reverse_walk(&agg->queue, iter) {
1305                 qseq = carl9170_get_seq(iter);
1306
1307                 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1308                         __skb_queue_after(&agg->queue, iter, skb);
1309                         goto queued;
1310                 }
1311         }
1312
1313         __skb_queue_head(&agg->queue, skb);
1314 queued:
1315
1316         if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1317                 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
1318                         agg->state = CARL9170_TID_STATE_XMIT;
1319                         run = true;
1320                 }
1321         }
1322
1323         spin_unlock_bh(&agg->lock);
1324         rcu_read_unlock();
1325
1326         return run;
1327
1328 err_unlock:
1329         spin_unlock_bh(&agg->lock);
1330
1331 err_unlock_rcu:
1332         rcu_read_unlock();
1333         super->f.mac_control &= ~cpu_to_le16(AR9170_TX_MAC_AGGR);
1334         carl9170_tx_status(ar, skb, false);
1335         ar->tx_dropped++;
1336         return false;
1337 }
1338
1339 int carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
1340 {
1341         struct ar9170 *ar = hw->priv;
1342         struct ieee80211_tx_info *info;
1343         struct ieee80211_sta *sta;
1344         bool run;
1345
1346         if (unlikely(!IS_STARTED(ar)))
1347                 goto err_free;
1348
1349         info = IEEE80211_SKB_CB(skb);
1350         sta = info->control.sta;
1351
1352         if (unlikely(carl9170_tx_prepare(ar, skb)))
1353                 goto err_free;
1354
1355         carl9170_tx_accounting(ar, skb);
1356         /*
1357          * from now on, one has to use carl9170_tx_status to free
1358          * all ressouces which are associated with the frame.
1359          */
1360
1361         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1362                 run = carl9170_tx_ampdu_queue(ar, sta, skb);
1363                 if (run)
1364                         carl9170_tx_ampdu(ar);
1365
1366         } else {
1367                 unsigned int queue = skb_get_queue_mapping(skb);
1368
1369                 skb_queue_tail(&ar->tx_pending[queue], skb);
1370         }
1371
1372         carl9170_tx(ar);
1373         return NETDEV_TX_OK;
1374
1375 err_free:
1376         ar->tx_dropped++;
1377         dev_kfree_skb_any(skb);
1378         return NETDEV_TX_OK;
1379 }
1380
1381 void carl9170_tx_scheduler(struct ar9170 *ar)
1382 {
1383
1384         if (ar->tx_ampdu_schedule)
1385                 carl9170_tx_ampdu(ar);
1386
1387         if (ar->tx_schedule)
1388                 carl9170_tx(ar);
1389 }