Pileus Git - ~andy/linux/blob - 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 /* needs rcu_read_lock */
 108 static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar,
 109                                                    struct sk_buff *skb)
 110 {
 111         struct _carl9170_tx_superframe *super = (void *) skb->data;
 112         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 113         struct ieee80211_vif *vif;
 114         unsigned int vif_id;
 115
 116         vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
 117                  CARL9170_TX_SUPER_MISC_VIF_ID_S;
 118
 119         if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))
 120                 return NULL;
 121
 122         vif = rcu_dereference(ar->vif_priv[vif_id].vif);
 123         if (unlikely(!vif))
 124                 return NULL;
 125
 126         /*
 127          * Normally we should use wrappers like ieee80211_get_DA to get
 128          * the correct peer ieee80211_sta.
 129          *
 130          * But there is a problem with indirect traffic (broadcasts, or
 131          * data which is designated for other stations) in station mode.
 132          * The frame will be directed to the AP for distribution and not
 133          * to the actual destination.
 134          */
 135
 136         return ieee80211_find_sta(vif, hdr->addr1);
 137 }
 138
 139 static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb)
 140 {
 141         struct ieee80211_sta *sta;
 142         struct carl9170_sta_info *sta_info;
 143
 144         rcu_read_lock();
 145         sta = __carl9170_get_tx_sta(ar, skb);
 146         if (unlikely(!sta))
 147                 goto out_rcu;
 148
 149         sta_info = (struct carl9170_sta_info *) sta->drv_priv;
 150         if (atomic_dec_return(&sta_info->pending_frames) == 0)
 151                 ieee80211_sta_block_awake(ar->hw, sta, false);
 152
 153 out_rcu:
 154         rcu_read_unlock();
 155 }
 156
 157 static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
 158 {
 159         int queue;
 160
 161         queue = skb_get_queue_mapping(skb);
 162
 163         spin_lock_bh(&ar->tx_stats_lock);
 164
 165         ar->tx_stats[queue].len--;
 166
 167         if (!is_mem_full(ar)) {
 168                 unsigned int i;
 169                 for (i = 0; i < ar->hw->queues; i++) {
 170                         if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)
 171                                 continue;
 172
 173                         if (ieee80211_queue_stopped(ar->hw, i)) {
 174                                 unsigned long tmp;
 175
 176                                 tmp = jiffies - ar->queue_stop_timeout[i];
 177                                 if (tmp > ar->max_queue_stop_timeout[i])
 178                                         ar->max_queue_stop_timeout[i] = tmp;
 179                         }
 180
 181                         ieee80211_wake_queue(ar->hw, i);
 182                 }
 183         }
 184
 185         spin_unlock_bh(&ar->tx_stats_lock);
 186
 187         if (atomic_dec_and_test(&ar->tx_total_queued))
 188                 complete(&ar->tx_flush);
 189 }
 190
 191 static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 192 {
 193         struct _carl9170_tx_superframe *super = (void *) skb->data;
 194         unsigned int chunks;
 195         int cookie = -1;
 196
 197         atomic_inc(&ar->mem_allocs);
 198
 199         chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);
 200         if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {
 201                 atomic_add(chunks, &ar->mem_free_blocks);
 202                 return -ENOSPC;
 203         }
 204
 205         spin_lock_bh(&ar->mem_lock);
 206         cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0);
 207         spin_unlock_bh(&ar->mem_lock);
 208
 209         if (unlikely(cookie < 0)) {
 210                 atomic_add(chunks, &ar->mem_free_blocks);
 211                 return -ENOSPC;
 212         }
 213
 214         super = (void *) skb->data;
 215
 216         /*
 217          * Cookie #0 serves two special purposes:
 218          *  1. The firmware might use it generate BlockACK frames
 219          *     in responds of an incoming BlockAckReqs.
 220          *
 221          *  2. Prevent double-free bugs.
 222          */
 223         super->s.cookie = (u8) cookie + 1;
 224         return 0;
 225 }
 226
 227 static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 228 {
 229         struct _carl9170_tx_superframe *super = (void *) skb->data;
 230         int cookie;
 231
 232         /* make a local copy of the cookie */
 233         cookie = super->s.cookie;
 234         /* invalidate cookie */
 235         super->s.cookie = 0;
 236
 237         /*
 238          * Do a out-of-bounds check on the cookie:
 239          *
 240          *  * cookie "0" is reserved and won't be assigned to any
 241          *    out-going frame. Internally however, it is used to
 242          *    mark no longer/un-accounted frames and serves as a
 243          *    cheap way of preventing frames from being freed
 244          *    twice by _accident_. NB: There is a tiny race...
 245          *
 246          *  * obviously, cookie number is limited by the amount
 247          *    of available memory blocks, so the number can
 248          *    never execeed the mem_blocks count.
 249          */
 250         if (unlikely(WARN_ON_ONCE(cookie == 0) ||
 251             WARN_ON_ONCE(cookie > ar->fw.mem_blocks)))
 252                 return;
 253
 254         atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),
 255                    &ar->mem_free_blocks);
 256
 257         spin_lock_bh(&ar->mem_lock);
 258         bitmap_release_region(ar->mem_bitmap, cookie - 1, 0);
 259         spin_unlock_bh(&ar->mem_lock);
 260 }
 261
 262 /* Called from any context */
 263 static void carl9170_tx_release(struct kref *ref)
 264 {
 265         struct ar9170 *ar;
 266         struct carl9170_tx_info *arinfo;
 267         struct ieee80211_tx_info *txinfo;
 268         struct sk_buff *skb;
 269
 270         arinfo = container_of(ref, struct carl9170_tx_info, ref);
 271         txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,
 272                               rate_driver_data);
 273         skb = container_of((void *) txinfo, struct sk_buff, cb);
 274
 275         ar = arinfo->ar;
 276         if (WARN_ON_ONCE(!ar))
 277                 return;
 278
 279         BUILD_BUG_ON(
 280             offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
 281
 282         memset(&txinfo->status.ampdu_ack_len, 0,
 283                sizeof(struct ieee80211_tx_info) -
 284                offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
 285
 286         if (atomic_read(&ar->tx_total_queued))
 287                 ar->tx_schedule = true;
 288
 289         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {
 290                 if (!atomic_read(&ar->tx_ampdu_upload))
 291                         ar->tx_ampdu_schedule = true;
 292
 293                 if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {
 294                         struct _carl9170_tx_superframe *super;
 295
 296                         super = (void *)skb->data;
 297                         txinfo->status.ampdu_len = super->s.rix;
 298                         txinfo->status.ampdu_ack_len = super->s.cnt;
 299                 } else if (txinfo->flags & IEEE80211_TX_STAT_ACK) {
 300                         /*
 301                          * drop redundant tx_status reports:
 302                          *
 303                          * 1. ampdu_ack_len of the final tx_status does
 304                          *    include the feedback of this particular frame.
 305                          *
 306                          * 2. tx_status_irqsafe only queues up to 128
 307                          *    tx feedback reports and discards the rest.
 308                          *
 309                          * 3. minstrel_ht is picky, it only accepts
 310                          *    reports of frames with the TX_STATUS_AMPDU flag.
 311                          */
 312
 313                         dev_kfree_skb_any(skb);
 314                         return;
 315                 } else {
 316                         /*
 317                          * Frame has failed, but we want to keep it in
 318                          * case it was lost due to a power-state
 319                          * transition.
 320                          */
 321                 }
 322         }
 323
 324         skb_pull(skb, sizeof(struct _carl9170_tx_superframe));
 325         ieee80211_tx_status_irqsafe(ar->hw, skb);
 326 }
 327
 328 void carl9170_tx_get_skb(struct sk_buff *skb)
 329 {
 330         struct carl9170_tx_info *arinfo = (void *)
 331                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 332         kref_get(&arinfo->ref);
 333 }
 334
 335 int carl9170_tx_put_skb(struct sk_buff *skb)
 336 {
 337         struct carl9170_tx_info *arinfo = (void *)
 338                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 339
 340         return kref_put(&arinfo->ref, carl9170_tx_release);
 341 }
 342
 343 /* Caller must hold the tid_info->lock & rcu_read_lock */
 344 static void carl9170_tx_shift_bm(struct ar9170 *ar,
 345         struct carl9170_sta_tid *tid_info, u16 seq)
 346 {
 347         u16 off;
 348
 349         off = SEQ_DIFF(seq, tid_info->bsn);
 350
 351         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 352                 return;
 353
 354         /*
 355          * Sanity check. For each MPDU we set the bit in bitmap and
 356          * clear it once we received the tx_status.
 357          * But if the bit is already cleared then we've been bitten
 358          * by a bug.
 359          */
 360         WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
 361
 362         off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
 363         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 364                 return;
 365
 366         if (!bitmap_empty(tid_info->bitmap, off))
 367                 off = find_first_bit(tid_info->bitmap, off);
 368
 369         tid_info->bsn += off;
 370         tid_info->bsn &= 0x0fff;
 371
 372         bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,
 373                            off, CARL9170_BAW_BITS);
 374 }
 375
 376 static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
 377         struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
 378 {
 379         struct _carl9170_tx_superframe *super = (void *) skb->data;
 380         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 381         struct ieee80211_sta *sta;
 382         struct carl9170_sta_info *sta_info;
 383         struct carl9170_sta_tid *tid_info;
 384         u8 tid;
 385
 386         if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
 387             txinfo->flags & IEEE80211_TX_CTL_INJECTED ||
 388            (!(super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_AGGR))))
 389                 return;
 390
 391         rcu_read_lock();
 392         sta = __carl9170_get_tx_sta(ar, skb);
 393         if (unlikely(!sta))
 394                 goto out_rcu;
 395
 396         tid = get_tid_h(hdr);
 397
 398         sta_info = (void *) sta->drv_priv;
 399         tid_info = rcu_dereference(sta_info->agg[tid]);
 400         if (!tid_info)
 401                 goto out_rcu;
 402
 403         spin_lock_bh(&tid_info->lock);
 404         if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
 405                 carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));
 406
 407         if (sta_info->stats[tid].clear) {
 408                 sta_info->stats[tid].clear = false;
 409                 sta_info->stats[tid].req = false;
 410                 sta_info->stats[tid].ampdu_len = 0;
 411                 sta_info->stats[tid].ampdu_ack_len = 0;
 412         }
 413
 414         sta_info->stats[tid].ampdu_len++;
 415         if (txinfo->status.rates[0].count == 1)
 416                 sta_info->stats[tid].ampdu_ack_len++;
 417
 418         if (!(txinfo->flags & IEEE80211_TX_STAT_ACK))
 419                 sta_info->stats[tid].req = true;
 420
 421         if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
 422                 super->s.rix = sta_info->stats[tid].ampdu_len;
 423                 super->s.cnt = sta_info->stats[tid].ampdu_ack_len;
 424                 txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
 425                 if (sta_info->stats[tid].req)
 426                         txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 427
 428                 sta_info->stats[tid].clear = true;
 429         }
 430         spin_unlock_bh(&tid_info->lock);
 431
 432 out_rcu:
 433         rcu_read_unlock();
 434 }
 435
 436 void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
 437                         const bool success)
 438 {
 439         struct ieee80211_tx_info *txinfo;
 440
 441         carl9170_tx_accounting_free(ar, skb);
 442
 443         txinfo = IEEE80211_SKB_CB(skb);
 444
 445         if (success)
 446                 txinfo->flags |= IEEE80211_TX_STAT_ACK;
 447         else
 448                 ar->tx_ack_failures++;
 449
 450         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 451                 carl9170_tx_status_process_ampdu(ar, skb, txinfo);
 452
 453         carl9170_tx_ps_unblock(ar, skb);
 454         carl9170_tx_put_skb(skb);
 455 }
 456
 457 /* This function may be called form any context */
 458 void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
 459 {
 460         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 461
 462         atomic_dec(&ar->tx_total_pending);
 463
 464         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 465                 atomic_dec(&ar->tx_ampdu_upload);
 466
 467         if (carl9170_tx_put_skb(skb))
 468                 tasklet_hi_schedule(&ar->usb_tasklet);
 469 }
 470
 471 static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
 472                                                struct sk_buff_head *queue)
 473 {
 474         struct sk_buff *skb;
 475
 476         spin_lock_bh(&queue->lock);
 477         skb_queue_walk(queue, skb) {
 478                 struct _carl9170_tx_superframe *txc = (void *) skb->data;
 479
 480                 if (txc->s.cookie != cookie)
 481                         continue;
 482
 483                 __skb_unlink(skb, queue);
 484                 spin_unlock_bh(&queue->lock);
 485
 486                 carl9170_release_dev_space(ar, skb);
 487                 return skb;
 488         }
 489         spin_unlock_bh(&queue->lock);
 490
 491         return NULL;
 492 }
 493
 494 static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
 495         unsigned int tries, struct ieee80211_tx_info *txinfo)
 496 {
 497         unsigned int i;
 498
 499         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 500                 if (txinfo->status.rates[i].idx < 0)
 501                         break;
 502
 503                 if (i == rix) {
 504                         txinfo->status.rates[i].count = tries;
 505                         i++;
 506                         break;
 507                 }
 508         }
 509
 510         for (; i < IEEE80211_TX_MAX_RATES; i++) {
 511                 txinfo->status.rates[i].idx = -1;
 512                 txinfo->status.rates[i].count = 0;
 513         }
 514 }
 515
 516 static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
 517 {
 518         int i;
 519         struct sk_buff *skb;
 520         struct ieee80211_tx_info *txinfo;
 521         struct carl9170_tx_info *arinfo;
 522         bool restart = false;
 523
 524         for (i = 0; i < ar->hw->queues; i++) {
 525                 spin_lock_bh(&ar->tx_status[i].lock);
 526
 527                 skb = skb_peek(&ar->tx_status[i]);
 528
 529                 if (!skb)
 530                         goto next;
 531
 532                 txinfo = IEEE80211_SKB_CB(skb);
 533                 arinfo = (void *) txinfo->rate_driver_data;
 534
 535                 if (time_is_before_jiffies(arinfo->timeout +
 536                     msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
 537                         restart = true;
 538
 539 next:
 540                 spin_unlock_bh(&ar->tx_status[i].lock);
 541         }
 542
 543         if (restart) {
 544                 /*
 545                  * At least one queue has been stuck for long enough.
 546                  * Give the device a kick and hope it gets back to
 547                  * work.
 548                  *
 549                  * possible reasons may include:
 550                  *  - frames got lost/corrupted (bad connection to the device)
 551                  *  - stalled rx processing/usb controller hiccups
 552                  *  - firmware errors/bugs
 553                  *  - every bug you can think of.
 554                  *  - all bugs you can't...
 555                  *  - ...
 556                  */
 557                 carl9170_restart(ar, CARL9170_RR_STUCK_TX);
 558         }
 559 }
 560
 561 static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)
 562 {
 563         struct carl9170_sta_tid *iter;
 564         struct sk_buff *skb;
 565         struct ieee80211_tx_info *txinfo;
 566         struct carl9170_tx_info *arinfo;
 567         struct ieee80211_sta *sta;
 568
 569         rcu_read_lock();
 570         list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {
 571                 if (iter->state < CARL9170_TID_STATE_IDLE)
 572                         continue;
 573
 574                 spin_lock_bh(&iter->lock);
 575                 skb = skb_peek(&iter->queue);
 576                 if (!skb)
 577                         goto unlock;
 578
 579                 txinfo = IEEE80211_SKB_CB(skb);
 580                 arinfo = (void *)txinfo->rate_driver_data;
 581                 if (time_is_after_jiffies(arinfo->timeout +
 582                     msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))
 583                         goto unlock;
 584
 585                 sta = __carl9170_get_tx_sta(ar, skb);
 586                 if (WARN_ON(!sta))
 587                         goto unlock;
 588
 589                 ieee80211_stop_tx_ba_session(sta, iter->tid);
 590 unlock:
 591                 spin_unlock_bh(&iter->lock);
 592
 593         }
 594         rcu_read_unlock();
 595 }
 596
 597 void carl9170_tx_janitor(struct work_struct *work)
 598 {
 599         struct ar9170 *ar = container_of(work, struct ar9170,
 600                                          tx_janitor.work);
 601         if (!IS_STARTED(ar))
 602                 return;
 603
 604         ar->tx_janitor_last_run = jiffies;
 605
 606         carl9170_check_queue_stop_timeout(ar);
 607         carl9170_tx_ampdu_timeout(ar);
 608
 609         if (!atomic_read(&ar->tx_total_queued))
 610                 return;
 611
 612         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
 613                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
 614 }
 615
 616 static void __carl9170_tx_process_status(struct ar9170 *ar,
 617         const uint8_t cookie, const uint8_t info)
 618 {
 619         struct sk_buff *skb;
 620         struct ieee80211_tx_info *txinfo;
 621         unsigned int r, t, q;
 622         bool success = true;
 623
 624         q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE];
 625
 626         skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);
 627         if (!skb) {
 628                 /*
 629                  * We have lost the race to another thread.
 630                  */
 631
 632                 return ;
 633         }
 634
 635         txinfo = IEEE80211_SKB_CB(skb);
 636
 637         if (!(info & CARL9170_TX_STATUS_SUCCESS))
 638                 success = false;
 639
 640         r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
 641         t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
 642
 643         carl9170_tx_fill_rateinfo(ar, r, t, txinfo);
 644         carl9170_tx_status(ar, skb, success);
 645 }
 646
 647 void carl9170_tx_process_status(struct ar9170 *ar,
 648                                 const struct carl9170_rsp *cmd)
 649 {
 650         unsigned int i;
 651
 652         for (i = 0;  i < cmd->hdr.ext; i++) {
 653                 if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
 654                         print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
 655                                              (void *) cmd, cmd->hdr.len + 4);
 656                         break;
 657                 }
 658
 659                 __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,
 660                                              cmd->_tx_status[i].info);
 661         }
 662 }
 663
 664 static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar,
 665         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate,
 666         unsigned int *phyrate, unsigned int *tpc, unsigned int *chains)
 667 {
 668         struct ieee80211_rate *rate = NULL;
 669         u8 *txpower;
 670         unsigned int idx;
 671
 672         idx = txrate->idx;
 673         *tpc = 0;
 674         *phyrate = 0;
 675
 676         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 677                 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
 678                         /* +1 dBm for HT40 */
 679                         *tpc += 2;
 680
 681                         if (info->band == IEEE80211_BAND_2GHZ)
 682                                 txpower = ar->power_2G_ht40;
 683                         else
 684                                 txpower = ar->power_5G_ht40;
 685                 } else {
 686                         if (info->band == IEEE80211_BAND_2GHZ)
 687                                 txpower = ar->power_2G_ht20;
 688                         else
 689                                 txpower = ar->power_5G_ht20;
 690                 }
 691
 692                 *phyrate = txrate->idx;
 693                 *tpc += txpower[idx & 7];
 694         } else {
 695                 if (info->band == IEEE80211_BAND_2GHZ) {
 696                         if (idx < 4)
 697                                 txpower = ar->power_2G_cck;
 698                         else
 699                                 txpower = ar->power_2G_ofdm;
 700                 } else {
 701                         txpower = ar->power_5G_leg;
 702                         idx += 4;
 703                 }
 704
 705                 rate = &__carl9170_ratetable[idx];
 706                 *tpc += txpower[(rate->hw_value & 0x30) >> 4];
 707                 *phyrate = rate->hw_value & 0xf;
 708         }
 709
 710         if (ar->eeprom.tx_mask == 1) {
 711                 *chains = AR9170_TX_PHY_TXCHAIN_1;
 712         } else {
 713                 if (!(txrate->flags & IEEE80211_TX_RC_MCS) &&
 714                     rate && rate->bitrate >= 360)
 715                         *chains = AR9170_TX_PHY_TXCHAIN_1;
 716                 else
 717                         *chains = AR9170_TX_PHY_TXCHAIN_2;
 718         }
 719 }
 720
 721 static __le32 carl9170_tx_physet(struct ar9170 *ar,
 722         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
 723 {
 724         unsigned int power = 0, chains = 0, phyrate = 0;
 725         __le32 tmp;
 726
 727         tmp = cpu_to_le32(0);
 728
 729         if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 730                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
 731                         AR9170_TX_PHY_BW_S);
 732         /* this works because 40 MHz is 2 and dup is 3 */
 733         if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
 734                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
 735                         AR9170_TX_PHY_BW_S);
 736
 737         if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
 738                 tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
 739
 740         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 741                 SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx);
 742
 743                 /* heavy clip control */
 744                 tmp |= cpu_to_le32((txrate->idx & 0x7) <<
 745                         AR9170_TX_PHY_TX_HEAVY_CLIP_S);
 746
 747                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
 748
 749                 /*
 750                  * green field preamble does not work.
 751                  *
 752                  * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
 753                  * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
 754                  */
 755         } else {
 756                 if (info->band == IEEE80211_BAND_2GHZ) {
 757                         if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M)
 758                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK);
 759                         else
 760                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 761                 } else {
 762                         tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 763                 }
 764
 765                 /*
 766                  * short preamble seems to be broken too.
 767                  *
 768                  * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 769                  *      tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
 770                  */
 771         }
 772         carl9170_tx_rate_tpc_chains(ar, info, txrate,
 773                                     &phyrate, &power, &chains);
 774
 775         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate));
 776         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power));
 777         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains));
 778         return tmp;
 779 }
 780
 781 static bool carl9170_tx_rts_check(struct ar9170 *ar,
 782                                   struct ieee80211_tx_rate *rate,
 783                                   bool ampdu, bool multi)
 784 {
 785         switch (ar->erp_mode) {
 786         case CARL9170_ERP_AUTO:
 787                 if (ampdu)
 788                         break;
 789
 790         case CARL9170_ERP_MAC80211:
 791                 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
 792                         break;
 793
 794         case CARL9170_ERP_RTS:
 795                 if (likely(!multi))
 796                         return true;
 797
 798         default:
 799                 break;
 800         }
 801
 802         return false;
 803 }
 804
 805 static bool carl9170_tx_cts_check(struct ar9170 *ar,
 806                                   struct ieee80211_tx_rate *rate)
 807 {
 808         switch (ar->erp_mode) {
 809         case CARL9170_ERP_AUTO:
 810         case CARL9170_ERP_MAC80211:
 811                 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 812                         break;
 813
 814         case CARL9170_ERP_CTS:
 815                 return true;
 816
 817         default:
 818                 break;
 819         }
 820
 821         return false;
 822 }
 823
 824 static int carl9170_tx_prepare(struct ar9170 *ar, struct sk_buff *skb)
 825 {
 826         struct ieee80211_hdr *hdr;
 827         struct _carl9170_tx_superframe *txc;
 828         struct carl9170_vif_info *cvif;
 829         struct ieee80211_tx_info *info;
 830         struct ieee80211_tx_rate *txrate;
 831         struct ieee80211_sta *sta;
 832         struct carl9170_tx_info *arinfo;
 833         unsigned int hw_queue;
 834         int i;
 835         __le16 mac_tmp;
 836         u16 len;
 837         bool ampdu, no_ack;
 838
 839         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
 840         BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
 841                      CARL9170_TX_SUPERDESC_LEN);
 842
 843         BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
 844                      AR9170_TX_HWDESC_LEN);
 845
 846         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
 847
 848         BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
 849                 ((CARL9170_TX_SUPER_MISC_VIF_ID >>
 850                  CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
 851
 852         hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
 853
 854         hdr = (void *)skb->data;
 855         info = IEEE80211_SKB_CB(skb);
 856         len = skb->len;
 857
 858         /*
 859          * Note: If the frame was sent through a monitor interface,
 860          * the ieee80211_vif pointer can be NULL.
 861          */
 862         if (likely(info->control.vif))
 863                 cvif = (void *) info->control.vif->drv_priv;
 864         else
 865                 cvif = NULL;
 866
 867         sta = info->control.sta;
 868
 869         txc = (void *)skb_push(skb, sizeof(*txc));
 870         memset(txc, 0, sizeof(*txc));
 871
 872         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
 873
 874         if (likely(cvif))
 875                 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
 876
 877         if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
 878                 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
 879
 880         if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
 881                 txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;
 882
 883         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
 884                 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
 885
 886         mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
 887                               AR9170_TX_MAC_BACKOFF);
 888         mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
 889                                AR9170_TX_MAC_QOS);
 890
 891         no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
 892         if (unlikely(no_ack))
 893                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
 894
 895         if (info->control.hw_key) {
 896                 len += info->control.hw_key->icv_len;
 897
 898                 switch (info->control.hw_key->cipher) {
 899                 case WLAN_CIPHER_SUITE_WEP40:
 900                 case WLAN_CIPHER_SUITE_WEP104:
 901                 case WLAN_CIPHER_SUITE_TKIP:
 902                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
 903                         break;
 904                 case WLAN_CIPHER_SUITE_CCMP:
 905                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
 906                         break;
 907                 default:
 908                         WARN_ON(1);
 909                         goto err_out;
 910                 }
 911         }
 912
 913         ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
 914         if (ampdu) {
 915                 unsigned int density, factor;
 916
 917                 if (unlikely(!sta || !cvif))
 918                         goto err_out;
 919
 920                 factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor);
 921                 density = sta->ht_cap.ampdu_density;
 922
 923                 if (density) {
 924                         /*
 925                          * Watch out!
 926                          *
 927                          * Otus uses slightly different density values than
 928                          * those from the 802.11n spec.
 929                          */
 930
 931                         density = max_t(unsigned int, density + 1, 7u);
 932                 }
 933
 934                 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
 935                         txc->s.ampdu_settings, density);
 936
 937                 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
 938                         txc->s.ampdu_settings, factor);
 939
 940                 for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
 941                         txrate = &info->control.rates[i];
 942                         if (txrate->idx >= 0) {
 943                                 txc->s.ri[i] =
 944                                         CARL9170_TX_SUPER_RI_AMPDU;
 945
 946                                 if (WARN_ON(!(txrate->flags &
 947                                               IEEE80211_TX_RC_MCS))) {
 948                                         /*
 949                                          * Not sure if it's even possible
 950                                          * to aggregate non-ht rates with
 951                                          * this HW.
 952                                          */
 953                                         goto err_out;
 954                                 }
 955                                 continue;
 956                         }
 957
 958                         txrate->idx = 0;
 959                         txrate->count = ar->hw->max_rate_tries;
 960                 }
 961
 962                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
 963         }
 964
 965         /*
 966          * NOTE: For the first rate, the ERP & AMPDU flags are directly
 967          * taken from mac_control. For all fallback rate, the firmware
 968          * updates the mac_control flags from the rate info field.
 969          */
 970         for (i = 1; i < CARL9170_TX_MAX_RATES; i++) {
 971                 txrate = &info->control.rates[i];
 972                 if (txrate->idx < 0)
 973                         break;
 974
 975                 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
 976                         txrate->count);
 977
 978                 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 979                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
 980                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 981                 else if (carl9170_tx_cts_check(ar, txrate))
 982                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
 983                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 984
 985                 txc->s.rr[i - 1] = carl9170_tx_physet(ar, info, txrate);
 986         }
 987
 988         txrate = &info->control.rates[0];
 989         SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[0], txrate->count);
 990
 991         if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 992                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
 993         else if (carl9170_tx_cts_check(ar, txrate))
 994                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
 995
 996         txc->s.len = cpu_to_le16(skb->len);
 997         txc->f.length = cpu_to_le16(len + FCS_LEN);
 998         txc->f.mac_control = mac_tmp;
 999         txc->f.phy_control = carl9170_tx_physet(ar, info, txrate);
1000
1001         arinfo = (void *)info->rate_driver_data;
1002         arinfo->timeout = jiffies;
1003         arinfo->ar = ar;
1004         kref_init(&arinfo->ref);
1005         return 0;
1006
1007 err_out:
1008         skb_pull(skb, sizeof(*txc));
1009         return -EINVAL;
1010 }
1011
1012 static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
1013 {
1014         struct _carl9170_tx_superframe *super;
1015
1016         super = (void *) skb->data;
1017         super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1018 }
1019
1020 static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1021 {
1022         struct _carl9170_tx_superframe *super;
1023         int tmp;
1024
1025         super = (void *) skb->data;
1026
1027         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1028                 CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1029
1030         /*
1031          * If you haven't noticed carl9170_tx_prepare has already filled
1032          * in all ampdu spacing & factor parameters.
1033          * Now it's the time to check whenever the settings have to be
1034          * updated by the firmware, or if everything is still the same.
1035          *
1036          * There's no sane way to handle different density values with
1037          * this hardware, so we may as well just do the compare in the
1038          * driver.
1039          */
1040
1041         if (tmp != ar->current_density) {
1042                 ar->current_density = tmp;
1043                 super->s.ampdu_settings |=
1044                         CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1045         }
1046
1047         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1048                 CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1049
1050         if (tmp != ar->current_factor) {
1051                 ar->current_factor = tmp;
1052                 super->s.ampdu_settings |=
1053                         CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1054         }
1055 }
1056
1057 static bool carl9170_tx_rate_check(struct ar9170 *ar, struct sk_buff *_dest,
1058                                    struct sk_buff *_src)
1059 {
1060         struct _carl9170_tx_superframe *dest, *src;
1061
1062         dest = (void *) _dest->data;
1063         src = (void *) _src->data;
1064
1065         /*
1066          * The mac80211 rate control algorithm expects that all MPDUs in
1067          * an AMPDU share the same tx vectors.
1068          * This is not really obvious right now, because the hardware
1069          * does the AMPDU setup according to its own rulebook.
1070          * Our nicely assembled, strictly monotonic increasing mpdu
1071          * chains will be broken up, mashed back together...
1072          */
1073
1074         return (dest->f.phy_control == src->f.phy_control);
1075 }
1076
1077 static void carl9170_tx_ampdu(struct ar9170 *ar)
1078 {
1079         struct sk_buff_head agg;
1080         struct carl9170_sta_tid *tid_info;
1081         struct sk_buff *skb, *first;
1082         unsigned int i = 0, done_ampdus = 0;
1083         u16 seq, queue, tmpssn;
1084
1085         atomic_inc(&ar->tx_ampdu_scheduler);
1086         ar->tx_ampdu_schedule = false;
1087
1088         if (atomic_read(&ar->tx_ampdu_upload))
1089                 return;
1090
1091         if (!ar->tx_ampdu_list_len)
1092                 return;
1093
1094         __skb_queue_head_init(&agg);
1095
1096         rcu_read_lock();
1097         tid_info = rcu_dereference(ar->tx_ampdu_iter);
1098         if (WARN_ON_ONCE(!tid_info)) {
1099                 rcu_read_unlock();
1100                 return;
1101         }
1102
1103 retry:
1104         list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1105                 i++;
1106
1107                 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1108                         continue;
1109
1110                 queue = TID_TO_WME_AC(tid_info->tid);
1111
1112                 spin_lock_bh(&tid_info->lock);
1113                 if (tid_info->state != CARL9170_TID_STATE_XMIT)
1114                         goto processed;
1115
1116                 tid_info->counter++;
1117                 first = skb_peek(&tid_info->queue);
1118                 tmpssn = carl9170_get_seq(first);
1119                 seq = tid_info->snx;
1120
1121                 if (unlikely(tmpssn != seq)) {
1122                         tid_info->state = CARL9170_TID_STATE_IDLE;
1123
1124                         goto processed;
1125                 }
1126
1127                 while ((skb = skb_peek(&tid_info->queue))) {
1128                         /* strict 0, 1, ..., n - 1, n frame sequence order */
1129                         if (unlikely(carl9170_get_seq(skb) != seq))
1130                                 break;
1131
1132                         /* don't upload more than AMPDU FACTOR allows. */
1133                         if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1134                             (tid_info->max - 1)))
1135                                 break;
1136
1137                         if (!carl9170_tx_rate_check(ar, skb, first))
1138                                 break;
1139
1140                         atomic_inc(&ar->tx_ampdu_upload);
1141                         tid_info->snx = seq = SEQ_NEXT(seq);
1142                         __skb_unlink(skb, &tid_info->queue);
1143
1144                         __skb_queue_tail(&agg, skb);
1145
1146                         if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
1147                                 break;
1148                 }
1149
1150                 if (skb_queue_empty(&tid_info->queue) ||
1151                     carl9170_get_seq(skb_peek(&tid_info->queue)) !=
1152                     tid_info->snx) {
1153                         /*
1154                          * stop TID, if A-MPDU frames are still missing,
1155                          * or whenever the queue is empty.
1156                          */
1157
1158                         tid_info->state = CARL9170_TID_STATE_IDLE;
1159                 }
1160                 done_ampdus++;
1161
1162 processed:
1163                 spin_unlock_bh(&tid_info->lock);
1164
1165                 if (skb_queue_empty(&agg))
1166                         continue;
1167
1168                 /* apply ampdu spacing & factor settings */
1169                 carl9170_set_ampdu_params(ar, skb_peek(&agg));
1170
1171                 /* set aggregation push bit */
1172                 carl9170_set_immba(ar, skb_peek_tail(&agg));
1173
1174                 spin_lock_bh(&ar->tx_pending[queue].lock);
1175                 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
1176                 spin_unlock_bh(&ar->tx_pending[queue].lock);
1177                 ar->tx_schedule = true;
1178         }
1179         if ((done_ampdus++ == 0) && (i++ == 0))
1180                 goto retry;
1181
1182         rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1183         rcu_read_unlock();
1184 }
1185
1186 static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1187                                             struct sk_buff_head *queue)
1188 {
1189         struct sk_buff *skb;
1190         struct ieee80211_tx_info *info;
1191         struct carl9170_tx_info *arinfo;
1192
1193         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1194
1195         spin_lock_bh(&queue->lock);
1196         skb = skb_peek(queue);
1197         if (unlikely(!skb))
1198                 goto err_unlock;
1199
1200         if (carl9170_alloc_dev_space(ar, skb))
1201                 goto err_unlock;
1202
1203         __skb_unlink(skb, queue);
1204         spin_unlock_bh(&queue->lock);
1205
1206         info = IEEE80211_SKB_CB(skb);
1207         arinfo = (void *) info->rate_driver_data;
1208
1209         arinfo->timeout = jiffies;
1210         return skb;
1211
1212 err_unlock:
1213         spin_unlock_bh(&queue->lock);
1214         return NULL;
1215 }
1216
1217 void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1218 {
1219         struct _carl9170_tx_superframe *super;
1220         uint8_t q = 0;
1221
1222         ar->tx_dropped++;
1223
1224         super = (void *)skb->data;
1225         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1226                 ar9170_qmap[carl9170_get_queue(ar, skb)]);
1227         __carl9170_tx_process_status(ar, super->s.cookie, q);
1228 }
1229
1230 static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
1231 {
1232         struct ieee80211_sta *sta;
1233         struct carl9170_sta_info *sta_info;
1234
1235         rcu_read_lock();
1236         sta = __carl9170_get_tx_sta(ar, skb);
1237         if (!sta)
1238                 goto out_rcu;
1239
1240         sta_info = (void *) sta->drv_priv;
1241         if (unlikely(sta_info->sleeping)) {
1242                 struct ieee80211_tx_info *tx_info;
1243
1244                 rcu_read_unlock();
1245
1246                 tx_info = IEEE80211_SKB_CB(skb);
1247                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
1248                         atomic_dec(&ar->tx_ampdu_upload);
1249
1250                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1251                 carl9170_tx_status(ar, skb, false);
1252                 return true;
1253         }
1254
1255 out_rcu:
1256         rcu_read_unlock();
1257         return false;
1258 }
1259
1260 static void carl9170_tx(struct ar9170 *ar)
1261 {
1262         struct sk_buff *skb;
1263         unsigned int i, q;
1264         bool schedule_garbagecollector = false;
1265
1266         ar->tx_schedule = false;
1267
1268         if (unlikely(!IS_STARTED(ar)))
1269                 return;
1270
1271         carl9170_usb_handle_tx_err(ar);
1272
1273         for (i = 0; i < ar->hw->queues; i++) {
1274                 while (!skb_queue_empty(&ar->tx_pending[i])) {
1275                         skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
1276                         if (unlikely(!skb))
1277                                 break;
1278
1279                         if (unlikely(carl9170_tx_ps_drop(ar, skb)))
1280                                 continue;
1281
1282                         atomic_inc(&ar->tx_total_pending);
1283
1284                         q = __carl9170_get_queue(ar, i);
1285                         /*
1286                          * NB: tx_status[i] vs. tx_status[q],
1287                          * TODO: Move into pick_skb or alloc_dev_space.
1288                          */
1289                         skb_queue_tail(&ar->tx_status[q], skb);
1290
1291                         /*
1292                          * increase ref count to "2".
1293                          * Ref counting is the easiest way to solve the
1294                          * race between the urb's completion routine:
1295                          *      carl9170_tx_callback
1296                          * and wlan tx status functions:
1297                          *      carl9170_tx_status/janitor.
1298                          */
1299                         carl9170_tx_get_skb(skb);
1300
1301                         carl9170_usb_tx(ar, skb);
1302                         schedule_garbagecollector = true;
1303                 }
1304         }
1305
1306         if (!schedule_garbagecollector)
1307                 return;
1308
1309         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
1310                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1311 }
1312
1313 static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1314         struct ieee80211_sta *sta, struct sk_buff *skb)
1315 {
1316         struct _carl9170_tx_superframe *super = (void *) skb->data;
1317         struct carl9170_sta_info *sta_info;
1318         struct carl9170_sta_tid *agg;
1319         struct sk_buff *iter;
1320         u16 tid, seq, qseq, off;
1321         bool run = false;
1322
1323         tid = carl9170_get_tid(skb);
1324         seq = carl9170_get_seq(skb);
1325         sta_info = (void *) sta->drv_priv;
1326
1327         rcu_read_lock();
1328         agg = rcu_dereference(sta_info->agg[tid]);
1329
1330         if (!agg)
1331                 goto err_unlock_rcu;
1332
1333         spin_lock_bh(&agg->lock);
1334         if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1335                 goto err_unlock;
1336
1337         /* check if sequence is within the BA window */
1338         if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1339                 goto err_unlock;
1340
1341         if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1342                 goto err_unlock;
1343
1344         off = SEQ_DIFF(seq, agg->bsn);
1345         if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1346                 goto err_unlock;
1347
1348         if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1349                 __skb_queue_tail(&agg->queue, skb);
1350                 agg->hsn = seq;
1351                 goto queued;
1352         }
1353
1354         skb_queue_reverse_walk(&agg->queue, iter) {
1355                 qseq = carl9170_get_seq(iter);
1356
1357                 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1358                         __skb_queue_after(&agg->queue, iter, skb);
1359                         goto queued;
1360                 }
1361         }
1362
1363         __skb_queue_head(&agg->queue, skb);
1364 queued:
1365
1366         if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1367                 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
1368                         agg->state = CARL9170_TID_STATE_XMIT;
1369                         run = true;
1370                 }
1371         }
1372
1373         spin_unlock_bh(&agg->lock);
1374         rcu_read_unlock();
1375
1376         return run;
1377
1378 err_unlock:
1379         spin_unlock_bh(&agg->lock);
1380
1381 err_unlock_rcu:
1382         rcu_read_unlock();
1383         super->f.mac_control &= ~cpu_to_le16(AR9170_TX_MAC_AGGR);
1384         carl9170_tx_status(ar, skb, false);
1385         ar->tx_dropped++;
1386         return false;
1387 }
1388
1389 void carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
1390 {
1391         struct ar9170 *ar = hw->priv;
1392         struct ieee80211_tx_info *info;
1393         struct ieee80211_sta *sta;
1394         bool run;
1395
1396         if (unlikely(!IS_STARTED(ar)))
1397                 goto err_free;
1398
1399         info = IEEE80211_SKB_CB(skb);
1400         sta = info->control.sta;
1401
1402         if (unlikely(carl9170_tx_prepare(ar, skb)))
1403                 goto err_free;
1404
1405         carl9170_tx_accounting(ar, skb);
1406         /*
1407          * from now on, one has to use carl9170_tx_status to free
1408          * all ressouces which are associated with the frame.
1409          */
1410
1411         if (sta) {
1412                 struct carl9170_sta_info *stai = (void *) sta->drv_priv;
1413                 atomic_inc(&stai->pending_frames);
1414         }
1415
1416         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1417                 run = carl9170_tx_ampdu_queue(ar, sta, skb);
1418                 if (run)
1419                         carl9170_tx_ampdu(ar);
1420
1421         } else {
1422                 unsigned int queue = skb_get_queue_mapping(skb);
1423
1424                 skb_queue_tail(&ar->tx_pending[queue], skb);
1425         }
1426
1427         carl9170_tx(ar);
1428         return;
1429
1430 err_free:
1431         ar->tx_dropped++;
1432         dev_kfree_skb_any(skb);
1433 }
1434
1435 void carl9170_tx_scheduler(struct ar9170 *ar)
1436 {
1437
1438         if (ar->tx_ampdu_schedule)
1439                 carl9170_tx_ampdu(ar);
1440
1441         if (ar->tx_schedule)
1442                 carl9170_tx(ar);
1443 }
1444
1445 int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
1446 {
1447         struct sk_buff *skb = NULL;
1448         struct carl9170_vif_info *cvif;
1449         struct ieee80211_tx_info *txinfo;
1450         struct ieee80211_tx_rate *rate;
1451         __le32 *data, *old = NULL;
1452         unsigned int plcp, power, chains;
1453         u32 word, ht1, off, addr, len;
1454         int i = 0, err = 0;
1455
1456         rcu_read_lock();
1457         cvif = rcu_dereference(ar->beacon_iter);
1458 retry:
1459         if (ar->vifs == 0 || !cvif)
1460                 goto out_unlock;
1461
1462         list_for_each_entry_continue_rcu(cvif, &ar->vif_list, list) {
1463                 if (cvif->active && cvif->enable_beacon)
1464                         goto found;
1465         }
1466
1467         if (!ar->beacon_enabled || i++)
1468                 goto out_unlock;
1469
1470         goto retry;
1471
1472 found:
1473         rcu_assign_pointer(ar->beacon_iter, cvif);
1474
1475         skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
1476                 NULL, NULL);
1477
1478         if (!skb) {
1479                 err = -ENOMEM;
1480                 goto err_free;
1481         }
1482
1483         txinfo = IEEE80211_SKB_CB(skb);
1484         spin_lock_bh(&ar->beacon_lock);
1485         data = (__le32 *)skb->data;
1486         if (cvif->beacon)
1487                 old = (__le32 *)cvif->beacon->data;
1488
1489         off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
1490         addr = ar->fw.beacon_addr + off;
1491         len = roundup(skb->len + FCS_LEN, 4);
1492
1493         if ((off + len) > ar->fw.beacon_max_len) {
1494                 if (net_ratelimit()) {
1495                         wiphy_err(ar->hw->wiphy, "beacon does not "
1496                                   "fit into device memory!\n");
1497                 }
1498                 err = -EINVAL;
1499                 goto err_unlock;
1500         }
1501
1502         if (len > AR9170_MAC_BCN_LENGTH_MAX) {
1503                 if (net_ratelimit()) {
1504                         wiphy_err(ar->hw->wiphy, "no support for beacons "
1505                                 "bigger than %d (yours:%d).\n",
1506                                  AR9170_MAC_BCN_LENGTH_MAX, len);
1507                 }
1508
1509                 err = -EMSGSIZE;
1510                 goto err_unlock;
1511         }
1512
1513         ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;
1514         rate = &txinfo->control.rates[0];
1515         carl9170_tx_rate_tpc_chains(ar, txinfo, rate, &plcp, &power, &chains);
1516         if (!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
1517                 if (plcp <= AR9170_TX_PHY_RATE_CCK_11M)
1518                         plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
1519                 else
1520                         plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;
1521         } else {
1522                 ht1 |= AR9170_MAC_BCN_HT1_HT_EN;
1523                 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1524                         plcp |= AR9170_MAC_BCN_HT2_SGI;
1525
1526                 if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
1527                         ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;
1528                         plcp |= AR9170_MAC_BCN_HT2_BW40;
1529                 }
1530                 if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {
1531                         ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;
1532                         plcp |= AR9170_MAC_BCN_HT2_BW40;
1533                 }
1534
1535                 SET_VAL(AR9170_MAC_BCN_HT2_LEN, plcp, skb->len + FCS_LEN);
1536         }
1537
1538         SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, ht1, 7);
1539         SET_VAL(AR9170_MAC_BCN_HT1_TPC, ht1, power);
1540         SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, ht1, chains);
1541         if (chains == AR9170_TX_PHY_TXCHAIN_2)
1542                 ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;
1543
1544         carl9170_async_regwrite_begin(ar);
1545         carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);
1546         if (!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS))
1547                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);
1548         else
1549                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);
1550
1551         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
1552                 /*
1553                  * XXX: This accesses beyond skb data for up
1554                  *      to the last 3 bytes!!
1555                  */
1556
1557                 if (old && (data[i] == old[i]))
1558                         continue;
1559
1560                 word = le32_to_cpu(data[i]);
1561                 carl9170_async_regwrite(addr + 4 * i, word);
1562         }
1563         carl9170_async_regwrite_finish();
1564
1565         dev_kfree_skb_any(cvif->beacon);
1566         cvif->beacon = NULL;
1567
1568         err = carl9170_async_regwrite_result();
1569         if (!err)
1570                 cvif->beacon = skb;
1571         spin_unlock_bh(&ar->beacon_lock);
1572         if (err)
1573                 goto err_free;
1574
1575         if (submit) {
1576                 err = carl9170_bcn_ctrl(ar, cvif->id,
1577                                         CARL9170_BCN_CTRL_CAB_TRIGGER,
1578                                         addr, skb->len + FCS_LEN);
1579
1580                 if (err)
1581                         goto err_free;
1582         }
1583 out_unlock:
1584         rcu_read_unlock();
1585         return 0;
1586
1587 err_unlock:
1588         spin_unlock_bh(&ar->beacon_lock);
1589
1590 err_free:
1591         rcu_read_unlock();
1592         dev_kfree_skb_any(skb);
1593         return err;
1594 }