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/slab.h>
  41 #include <linux/module.h>
  42 #include <linux/etherdevice.h>
  43 #include <net/mac80211.h>
  44 #include "carl9170.h"
  45 #include "hw.h"
  46 #include "cmd.h"
  47
  48 static inline unsigned int __carl9170_get_queue(struct ar9170 *ar,
  49                                                 unsigned int queue)
  50 {
  51         if (unlikely(modparam_noht)) {
  52                 return queue;
  53         } else {
  54                 /*
  55                  * This is just another workaround, until
  56                  * someone figures out how to get QoS and
  57                  * AMPDU to play nicely together.
  58                  */
  59
  60                 return 2;               /* AC_BE */
  61         }
  62 }
  63
  64 static inline unsigned int carl9170_get_queue(struct ar9170 *ar,
  65                                               struct sk_buff *skb)
  66 {
  67         return __carl9170_get_queue(ar, skb_get_queue_mapping(skb));
  68 }
  69
  70 static bool is_mem_full(struct ar9170 *ar)
  71 {
  72         return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) >
  73                 atomic_read(&ar->mem_free_blocks));
  74 }
  75
  76 static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb)
  77 {
  78         int queue, i;
  79         bool mem_full;
  80
  81         atomic_inc(&ar->tx_total_queued);
  82
  83         queue = skb_get_queue_mapping(skb);
  84         spin_lock_bh(&ar->tx_stats_lock);
  85
  86         /*
  87          * The driver has to accept the frame, regardless if the queue is
  88          * full to the brim, or not. We have to do the queuing internally,
  89          * since mac80211 assumes that a driver which can operate with
  90          * aggregated frames does not reject frames for this reason.
  91          */
  92         ar->tx_stats[queue].len++;
  93         ar->tx_stats[queue].count++;
  94
  95         mem_full = is_mem_full(ar);
  96         for (i = 0; i < ar->hw->queues; i++) {
  97                 if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) {
  98                         ieee80211_stop_queue(ar->hw, i);
  99                         ar->queue_stop_timeout[i] = jiffies;
 100                 }
 101         }
 102
 103         spin_unlock_bh(&ar->tx_stats_lock);
 104 }
 105
 106 /* needs rcu_read_lock */
 107 static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar,
 108                                                    struct sk_buff *skb)
 109 {
 110         struct _carl9170_tx_superframe *super = (void *) skb->data;
 111         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 112         struct ieee80211_vif *vif;
 113         unsigned int vif_id;
 114
 115         vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
 116                  CARL9170_TX_SUPER_MISC_VIF_ID_S;
 117
 118         if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))
 119                 return NULL;
 120
 121         vif = rcu_dereference(ar->vif_priv[vif_id].vif);
 122         if (unlikely(!vif))
 123                 return NULL;
 124
 125         /*
 126          * Normally we should use wrappers like ieee80211_get_DA to get
 127          * the correct peer ieee80211_sta.
 128          *
 129          * But there is a problem with indirect traffic (broadcasts, or
 130          * data which is designated for other stations) in station mode.
 131          * The frame will be directed to the AP for distribution and not
 132          * to the actual destination.
 133          */
 134
 135         return ieee80211_find_sta(vif, hdr->addr1);
 136 }
 137
 138 static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb)
 139 {
 140         struct ieee80211_sta *sta;
 141         struct carl9170_sta_info *sta_info;
 142
 143         rcu_read_lock();
 144         sta = __carl9170_get_tx_sta(ar, skb);
 145         if (unlikely(!sta))
 146                 goto out_rcu;
 147
 148         sta_info = (struct carl9170_sta_info *) sta->drv_priv;
 149         if (atomic_dec_return(&sta_info->pending_frames) == 0)
 150                 ieee80211_sta_block_awake(ar->hw, sta, false);
 151
 152 out_rcu:
 153         rcu_read_unlock();
 154 }
 155
 156 static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
 157 {
 158         int queue;
 159
 160         queue = skb_get_queue_mapping(skb);
 161
 162         spin_lock_bh(&ar->tx_stats_lock);
 163
 164         ar->tx_stats[queue].len--;
 165
 166         if (!is_mem_full(ar)) {
 167                 unsigned int i;
 168                 for (i = 0; i < ar->hw->queues; i++) {
 169                         if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)
 170                                 continue;
 171
 172                         if (ieee80211_queue_stopped(ar->hw, i)) {
 173                                 unsigned long tmp;
 174
 175                                 tmp = jiffies - ar->queue_stop_timeout[i];
 176                                 if (tmp > ar->max_queue_stop_timeout[i])
 177                                         ar->max_queue_stop_timeout[i] = tmp;
 178                         }
 179
 180                         ieee80211_wake_queue(ar->hw, i);
 181                 }
 182         }
 183
 184         spin_unlock_bh(&ar->tx_stats_lock);
 185
 186         if (atomic_dec_and_test(&ar->tx_total_queued))
 187                 complete(&ar->tx_flush);
 188 }
 189
 190 static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 191 {
 192         struct _carl9170_tx_superframe *super = (void *) skb->data;
 193         unsigned int chunks;
 194         int cookie = -1;
 195
 196         atomic_inc(&ar->mem_allocs);
 197
 198         chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);
 199         if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {
 200                 atomic_add(chunks, &ar->mem_free_blocks);
 201                 return -ENOSPC;
 202         }
 203
 204         spin_lock_bh(&ar->mem_lock);
 205         cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0);
 206         spin_unlock_bh(&ar->mem_lock);
 207
 208         if (unlikely(cookie < 0)) {
 209                 atomic_add(chunks, &ar->mem_free_blocks);
 210                 return -ENOSPC;
 211         }
 212
 213         super = (void *) skb->data;
 214
 215         /*
 216          * Cookie #0 serves two special purposes:
 217          *  1. The firmware might use it generate BlockACK frames
 218          *     in responds of an incoming BlockAckReqs.
 219          *
 220          *  2. Prevent double-free bugs.
 221          */
 222         super->s.cookie = (u8) cookie + 1;
 223         return 0;
 224 }
 225
 226 static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)
 227 {
 228         struct _carl9170_tx_superframe *super = (void *) skb->data;
 229         int cookie;
 230
 231         /* make a local copy of the cookie */
 232         cookie = super->s.cookie;
 233         /* invalidate cookie */
 234         super->s.cookie = 0;
 235
 236         /*
 237          * Do a out-of-bounds check on the cookie:
 238          *
 239          *  * cookie "0" is reserved and won't be assigned to any
 240          *    out-going frame. Internally however, it is used to
 241          *    mark no longer/un-accounted frames and serves as a
 242          *    cheap way of preventing frames from being freed
 243          *    twice by _accident_. NB: There is a tiny race...
 244          *
 245          *  * obviously, cookie number is limited by the amount
 246          *    of available memory blocks, so the number can
 247          *    never execeed the mem_blocks count.
 248          */
 249         if (unlikely(WARN_ON_ONCE(cookie == 0) ||
 250             WARN_ON_ONCE(cookie > ar->fw.mem_blocks)))
 251                 return;
 252
 253         atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),
 254                    &ar->mem_free_blocks);
 255
 256         spin_lock_bh(&ar->mem_lock);
 257         bitmap_release_region(ar->mem_bitmap, cookie - 1, 0);
 258         spin_unlock_bh(&ar->mem_lock);
 259 }
 260
 261 /* Called from any context */
 262 static void carl9170_tx_release(struct kref *ref)
 263 {
 264         struct ar9170 *ar;
 265         struct carl9170_tx_info *arinfo;
 266         struct ieee80211_tx_info *txinfo;
 267         struct sk_buff *skb;
 268
 269         arinfo = container_of(ref, struct carl9170_tx_info, ref);
 270         txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,
 271                               rate_driver_data);
 272         skb = container_of((void *) txinfo, struct sk_buff, cb);
 273
 274         ar = arinfo->ar;
 275         if (WARN_ON_ONCE(!ar))
 276                 return;
 277
 278         BUILD_BUG_ON(
 279             offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
 280
 281         memset(&txinfo->status.ack_signal, 0,
 282                sizeof(struct ieee80211_tx_info) -
 283                offsetof(struct ieee80211_tx_info, status.ack_signal));
 284
 285         if (atomic_read(&ar->tx_total_queued))
 286                 ar->tx_schedule = true;
 287
 288         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {
 289                 if (!atomic_read(&ar->tx_ampdu_upload))
 290                         ar->tx_ampdu_schedule = true;
 291
 292                 if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {
 293                         struct _carl9170_tx_superframe *super;
 294
 295                         super = (void *)skb->data;
 296                         txinfo->status.ampdu_len = super->s.rix;
 297                         txinfo->status.ampdu_ack_len = super->s.cnt;
 298                 } else if ((txinfo->flags & IEEE80211_TX_STAT_ACK) &&
 299                            !(txinfo->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
 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                          * 4. mac80211 is not particularly interested in
 313                          *    feedback either [CTL_REQ_TX_STATUS not set]
 314                          */
 315
 316                         ieee80211_free_txskb(ar->hw, skb);
 317                         return;
 318                 } else {
 319                         /*
 320                          * Either the frame transmission has failed or
 321                          * mac80211 requested tx status.
 322                          */
 323                 }
 324         }
 325
 326         skb_pull(skb, sizeof(struct _carl9170_tx_superframe));
 327         ieee80211_tx_status_irqsafe(ar->hw, skb);
 328 }
 329
 330 void carl9170_tx_get_skb(struct sk_buff *skb)
 331 {
 332         struct carl9170_tx_info *arinfo = (void *)
 333                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 334         kref_get(&arinfo->ref);
 335 }
 336
 337 int carl9170_tx_put_skb(struct sk_buff *skb)
 338 {
 339         struct carl9170_tx_info *arinfo = (void *)
 340                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 341
 342         return kref_put(&arinfo->ref, carl9170_tx_release);
 343 }
 344
 345 /* Caller must hold the tid_info->lock & rcu_read_lock */
 346 static void carl9170_tx_shift_bm(struct ar9170 *ar,
 347         struct carl9170_sta_tid *tid_info, u16 seq)
 348 {
 349         u16 off;
 350
 351         off = SEQ_DIFF(seq, tid_info->bsn);
 352
 353         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 354                 return;
 355
 356         /*
 357          * Sanity check. For each MPDU we set the bit in bitmap and
 358          * clear it once we received the tx_status.
 359          * But if the bit is already cleared then we've been bitten
 360          * by a bug.
 361          */
 362         WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
 363
 364         off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
 365         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 366                 return;
 367
 368         if (!bitmap_empty(tid_info->bitmap, off))
 369                 off = find_first_bit(tid_info->bitmap, off);
 370
 371         tid_info->bsn += off;
 372         tid_info->bsn &= 0x0fff;
 373
 374         bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,
 375                            off, CARL9170_BAW_BITS);
 376 }
 377
 378 static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
 379         struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
 380 {
 381         struct _carl9170_tx_superframe *super = (void *) skb->data;
 382         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 383         struct ieee80211_sta *sta;
 384         struct carl9170_sta_info *sta_info;
 385         struct carl9170_sta_tid *tid_info;
 386         u8 tid;
 387
 388         if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
 389             txinfo->flags & IEEE80211_TX_CTL_INJECTED)
 390                 return;
 391
 392         rcu_read_lock();
 393         sta = __carl9170_get_tx_sta(ar, skb);
 394         if (unlikely(!sta))
 395                 goto out_rcu;
 396
 397         tid = get_tid_h(hdr);
 398
 399         sta_info = (void *) sta->drv_priv;
 400         tid_info = rcu_dereference(sta_info->agg[tid]);
 401         if (!tid_info)
 402                 goto out_rcu;
 403
 404         spin_lock_bh(&tid_info->lock);
 405         if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
 406                 carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));
 407
 408         if (sta_info->stats[tid].clear) {
 409                 sta_info->stats[tid].clear = false;
 410                 sta_info->stats[tid].req = false;
 411                 sta_info->stats[tid].ampdu_len = 0;
 412                 sta_info->stats[tid].ampdu_ack_len = 0;
 413         }
 414
 415         sta_info->stats[tid].ampdu_len++;
 416         if (txinfo->status.rates[0].count == 1)
 417                 sta_info->stats[tid].ampdu_ack_len++;
 418
 419         if (!(txinfo->flags & IEEE80211_TX_STAT_ACK))
 420                 sta_info->stats[tid].req = true;
 421
 422         if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
 423                 super->s.rix = sta_info->stats[tid].ampdu_len;
 424                 super->s.cnt = sta_info->stats[tid].ampdu_ack_len;
 425                 txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
 426                 if (sta_info->stats[tid].req)
 427                         txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 428
 429                 sta_info->stats[tid].clear = true;
 430         }
 431         spin_unlock_bh(&tid_info->lock);
 432
 433 out_rcu:
 434         rcu_read_unlock();
 435 }
 436
 437 static void carl9170_tx_bar_status(struct ar9170 *ar, struct sk_buff *skb,
 438         struct ieee80211_tx_info *tx_info)
 439 {
 440         struct _carl9170_tx_superframe *super = (void *) skb->data;
 441         struct ieee80211_bar *bar = (void *) super->frame_data;
 442
 443         /*
 444          * Unlike all other frames, the status report for BARs does
 445          * not directly come from the hardware as it is incapable of
 446          * matching a BA to a previously send BAR.
 447          * Instead the RX-path will scan for incoming BAs and set the
 448          * IEEE80211_TX_STAT_ACK if it sees one that was likely
 449          * caused by a BAR from us.
 450          */
 451
 452         if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
 453            !(tx_info->flags & IEEE80211_TX_STAT_ACK)) {
 454                 struct carl9170_bar_list_entry *entry;
 455                 int queue = skb_get_queue_mapping(skb);
 456
 457                 rcu_read_lock();
 458                 list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) {
 459                         if (entry->skb == skb) {
 460                                 spin_lock_bh(&ar->bar_list_lock[queue]);
 461                                 list_del_rcu(&entry->list);
 462                                 spin_unlock_bh(&ar->bar_list_lock[queue]);
 463                                 kfree_rcu(entry, head);
 464                                 goto out;
 465                         }
 466                 }
 467
 468                 WARN(1, "bar not found in %d - ra:%pM ta:%pM c:%x ssn:%x\n",
 469                        queue, bar->ra, bar->ta, bar->control,
 470                         bar->start_seq_num);
 471 out:
 472                 rcu_read_unlock();
 473         }
 474 }
 475
 476 void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
 477                         const bool success)
 478 {
 479         struct ieee80211_tx_info *txinfo;
 480
 481         carl9170_tx_accounting_free(ar, skb);
 482
 483         txinfo = IEEE80211_SKB_CB(skb);
 484
 485         carl9170_tx_bar_status(ar, skb, txinfo);
 486
 487         if (success)
 488                 txinfo->flags |= IEEE80211_TX_STAT_ACK;
 489         else
 490                 ar->tx_ack_failures++;
 491
 492         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 493                 carl9170_tx_status_process_ampdu(ar, skb, txinfo);
 494
 495         carl9170_tx_ps_unblock(ar, skb);
 496         carl9170_tx_put_skb(skb);
 497 }
 498
 499 /* This function may be called form any context */
 500 void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
 501 {
 502         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 503
 504         atomic_dec(&ar->tx_total_pending);
 505
 506         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 507                 atomic_dec(&ar->tx_ampdu_upload);
 508
 509         if (carl9170_tx_put_skb(skb))
 510                 tasklet_hi_schedule(&ar->usb_tasklet);
 511 }
 512
 513 static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
 514                                                struct sk_buff_head *queue)
 515 {
 516         struct sk_buff *skb;
 517
 518         spin_lock_bh(&queue->lock);
 519         skb_queue_walk(queue, skb) {
 520                 struct _carl9170_tx_superframe *txc = (void *) skb->data;
 521
 522                 if (txc->s.cookie != cookie)
 523                         continue;
 524
 525                 __skb_unlink(skb, queue);
 526                 spin_unlock_bh(&queue->lock);
 527
 528                 carl9170_release_dev_space(ar, skb);
 529                 return skb;
 530         }
 531         spin_unlock_bh(&queue->lock);
 532
 533         return NULL;
 534 }
 535
 536 static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
 537         unsigned int tries, struct ieee80211_tx_info *txinfo)
 538 {
 539         unsigned int i;
 540
 541         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 542                 if (txinfo->status.rates[i].idx < 0)
 543                         break;
 544
 545                 if (i == rix) {
 546                         txinfo->status.rates[i].count = tries;
 547                         i++;
 548                         break;
 549                 }
 550         }
 551
 552         for (; i < IEEE80211_TX_MAX_RATES; i++) {
 553                 txinfo->status.rates[i].idx = -1;
 554                 txinfo->status.rates[i].count = 0;
 555         }
 556 }
 557
 558 static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
 559 {
 560         int i;
 561         struct sk_buff *skb;
 562         struct ieee80211_tx_info *txinfo;
 563         struct carl9170_tx_info *arinfo;
 564         bool restart = false;
 565
 566         for (i = 0; i < ar->hw->queues; i++) {
 567                 spin_lock_bh(&ar->tx_status[i].lock);
 568
 569                 skb = skb_peek(&ar->tx_status[i]);
 570
 571                 if (!skb)
 572                         goto next;
 573
 574                 txinfo = IEEE80211_SKB_CB(skb);
 575                 arinfo = (void *) txinfo->rate_driver_data;
 576
 577                 if (time_is_before_jiffies(arinfo->timeout +
 578                     msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
 579                         restart = true;
 580
 581 next:
 582                 spin_unlock_bh(&ar->tx_status[i].lock);
 583         }
 584
 585         if (restart) {
 586                 /*
 587                  * At least one queue has been stuck for long enough.
 588                  * Give the device a kick and hope it gets back to
 589                  * work.
 590                  *
 591                  * possible reasons may include:
 592                  *  - frames got lost/corrupted (bad connection to the device)
 593                  *  - stalled rx processing/usb controller hiccups
 594                  *  - firmware errors/bugs
 595                  *  - every bug you can think of.
 596                  *  - all bugs you can't...
 597                  *  - ...
 598                  */
 599                 carl9170_restart(ar, CARL9170_RR_STUCK_TX);
 600         }
 601 }
 602
 603 static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)
 604 {
 605         struct carl9170_sta_tid *iter;
 606         struct sk_buff *skb;
 607         struct ieee80211_tx_info *txinfo;
 608         struct carl9170_tx_info *arinfo;
 609         struct ieee80211_sta *sta;
 610
 611         rcu_read_lock();
 612         list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {
 613                 if (iter->state < CARL9170_TID_STATE_IDLE)
 614                         continue;
 615
 616                 spin_lock_bh(&iter->lock);
 617                 skb = skb_peek(&iter->queue);
 618                 if (!skb)
 619                         goto unlock;
 620
 621                 txinfo = IEEE80211_SKB_CB(skb);
 622                 arinfo = (void *)txinfo->rate_driver_data;
 623                 if (time_is_after_jiffies(arinfo->timeout +
 624                     msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))
 625                         goto unlock;
 626
 627                 sta = iter->sta;
 628                 if (WARN_ON(!sta))
 629                         goto unlock;
 630
 631                 ieee80211_stop_tx_ba_session(sta, iter->tid);
 632 unlock:
 633                 spin_unlock_bh(&iter->lock);
 634
 635         }
 636         rcu_read_unlock();
 637 }
 638
 639 void carl9170_tx_janitor(struct work_struct *work)
 640 {
 641         struct ar9170 *ar = container_of(work, struct ar9170,
 642                                          tx_janitor.work);
 643         if (!IS_STARTED(ar))
 644                 return;
 645
 646         ar->tx_janitor_last_run = jiffies;
 647
 648         carl9170_check_queue_stop_timeout(ar);
 649         carl9170_tx_ampdu_timeout(ar);
 650
 651         if (!atomic_read(&ar->tx_total_queued))
 652                 return;
 653
 654         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
 655                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
 656 }
 657
 658 static void __carl9170_tx_process_status(struct ar9170 *ar,
 659         const uint8_t cookie, const uint8_t info)
 660 {
 661         struct sk_buff *skb;
 662         struct ieee80211_tx_info *txinfo;
 663         unsigned int r, t, q;
 664         bool success = true;
 665
 666         q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE];
 667
 668         skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);
 669         if (!skb) {
 670                 /*
 671                  * We have lost the race to another thread.
 672                  */
 673
 674                 return ;
 675         }
 676
 677         txinfo = IEEE80211_SKB_CB(skb);
 678
 679         if (!(info & CARL9170_TX_STATUS_SUCCESS))
 680                 success = false;
 681
 682         r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
 683         t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
 684
 685         carl9170_tx_fill_rateinfo(ar, r, t, txinfo);
 686         carl9170_tx_status(ar, skb, success);
 687 }
 688
 689 void carl9170_tx_process_status(struct ar9170 *ar,
 690                                 const struct carl9170_rsp *cmd)
 691 {
 692         unsigned int i;
 693
 694         for (i = 0;  i < cmd->hdr.ext; i++) {
 695                 if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
 696                         print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
 697                                              (void *) cmd, cmd->hdr.len + 4);
 698                         break;
 699                 }
 700
 701                 __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,
 702                                              cmd->_tx_status[i].info);
 703         }
 704 }
 705
 706 static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar,
 707         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate,
 708         unsigned int *phyrate, unsigned int *tpc, unsigned int *chains)
 709 {
 710         struct ieee80211_rate *rate = NULL;
 711         u8 *txpower;
 712         unsigned int idx;
 713
 714         idx = txrate->idx;
 715         *tpc = 0;
 716         *phyrate = 0;
 717
 718         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 719                 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
 720                         /* +1 dBm for HT40 */
 721                         *tpc += 2;
 722
 723                         if (info->band == NL80211_BAND_2GHZ)
 724                                 txpower = ar->power_2G_ht40;
 725                         else
 726                                 txpower = ar->power_5G_ht40;
 727                 } else {
 728                         if (info->band == NL80211_BAND_2GHZ)
 729                                 txpower = ar->power_2G_ht20;
 730                         else
 731                                 txpower = ar->power_5G_ht20;
 732                 }
 733
 734                 *phyrate = txrate->idx;
 735                 *tpc += txpower[idx & 7];
 736         } else {
 737                 if (info->band == NL80211_BAND_2GHZ) {
 738                         if (idx < 4)
 739                                 txpower = ar->power_2G_cck;
 740                         else
 741                                 txpower = ar->power_2G_ofdm;
 742                 } else {
 743                         txpower = ar->power_5G_leg;
 744                         idx += 4;
 745                 }
 746
 747                 rate = &__carl9170_ratetable[idx];
 748                 *tpc += txpower[(rate->hw_value & 0x30) >> 4];
 749                 *phyrate = rate->hw_value & 0xf;
 750         }
 751
 752         if (ar->eeprom.tx_mask == 1) {
 753                 *chains = AR9170_TX_PHY_TXCHAIN_1;
 754         } else {
 755                 if (!(txrate->flags & IEEE80211_TX_RC_MCS) &&
 756                     rate && rate->bitrate >= 360)
 757                         *chains = AR9170_TX_PHY_TXCHAIN_1;
 758                 else
 759                         *chains = AR9170_TX_PHY_TXCHAIN_2;
 760         }
 761
 762         *tpc = min_t(unsigned int, *tpc, ar->hw->conf.power_level * 2);
 763 }
 764
 765 static __le32 carl9170_tx_physet(struct ar9170 *ar,
 766         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
 767 {
 768         unsigned int power = 0, chains = 0, phyrate = 0;
 769         __le32 tmp;
 770
 771         tmp = cpu_to_le32(0);
 772
 773         if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 774                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
 775                         AR9170_TX_PHY_BW_S);
 776         /* this works because 40 MHz is 2 and dup is 3 */
 777         if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
 778                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
 779                         AR9170_TX_PHY_BW_S);
 780
 781         if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
 782                 tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
 783
 784         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 785                 SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx);
 786
 787                 /* heavy clip control */
 788                 tmp |= cpu_to_le32((txrate->idx & 0x7) <<
 789                         AR9170_TX_PHY_TX_HEAVY_CLIP_S);
 790
 791                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
 792
 793                 /*
 794                  * green field preamble does not work.
 795                  *
 796                  * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
 797                  * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
 798                  */
 799         } else {
 800                 if (info->band == NL80211_BAND_2GHZ) {
 801                         if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M)
 802                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK);
 803                         else
 804                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 805                 } else {
 806                         tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 807                 }
 808
 809                 /*
 810                  * short preamble seems to be broken too.
 811                  *
 812                  * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 813                  *      tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
 814                  */
 815         }
 816         carl9170_tx_rate_tpc_chains(ar, info, txrate,
 817                                     &phyrate, &power, &chains);
 818
 819         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate));
 820         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power));
 821         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains));
 822         return tmp;
 823 }
 824
 825 static bool carl9170_tx_rts_check(struct ar9170 *ar,
 826                                   struct ieee80211_tx_rate *rate,
 827                                   bool ampdu, bool multi)
 828 {
 829         switch (ar->erp_mode) {
 830         case CARL9170_ERP_AUTO:
 831                 if (ampdu)
 832                         break;
 833
 834         case CARL9170_ERP_MAC80211:
 835                 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
 836                         break;
 837
 838         case CARL9170_ERP_RTS:
 839                 if (likely(!multi))
 840                         return true;
 841
 842         default:
 843                 break;
 844         }
 845
 846         return false;
 847 }
 848
 849 static bool carl9170_tx_cts_check(struct ar9170 *ar,
 850                                   struct ieee80211_tx_rate *rate)
 851 {
 852         switch (ar->erp_mode) {
 853         case CARL9170_ERP_AUTO:
 854         case CARL9170_ERP_MAC80211:
 855                 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 856                         break;
 857
 858         case CARL9170_ERP_CTS:
 859                 return true;
 860
 861         default:
 862                 break;
 863         }
 864
 865         return false;
 866 }
 867
 868 static void carl9170_tx_get_rates(struct ar9170 *ar,
 869                                   struct ieee80211_vif *vif,
 870                                   struct ieee80211_sta *sta,
 871                                   struct sk_buff *skb)
 872 {
 873         struct ieee80211_tx_info *info;
 874
 875         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
 876         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES > IEEE80211_TX_RATE_TABLE_SIZE);
 877
 878         info = IEEE80211_SKB_CB(skb);
 879
 880         ieee80211_get_tx_rates(vif, sta, skb,
 881                                info->control.rates,
 882                                IEEE80211_TX_MAX_RATES);
 883 }
 884
 885 static void carl9170_tx_apply_rateset(struct ar9170 *ar,
 886                                       struct ieee80211_tx_info *sinfo,
 887                                       struct sk_buff *skb)
 888 {
 889         struct ieee80211_tx_rate *txrate;
 890         struct ieee80211_tx_info *info;
 891         struct _carl9170_tx_superframe *txc = (void *) skb->data;
 892         int i;
 893         bool ampdu;
 894         bool no_ack;
 895
 896         info = IEEE80211_SKB_CB(skb);
 897         ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
 898         no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
 899
 900         /* Set the rate control probe flag for all (sub-) frames.
 901          * This is because the TX_STATS_AMPDU flag is only set on
 902          * the last frame, so it has to be inherited.
 903          */
 904         info->flags |= (sinfo->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
 905
 906         /* NOTE: For the first rate, the ERP & AMPDU flags are directly
 907          * taken from mac_control. For all fallback rate, the firmware
 908          * updates the mac_control flags from the rate info field.
 909          */
 910         for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
 911                 __le32 phy_set;
 912
 913                 txrate = &sinfo->control.rates[i];
 914                 if (txrate->idx < 0)
 915                         break;
 916
 917                 phy_set = carl9170_tx_physet(ar, info, txrate);
 918                 if (i == 0) {
 919                         __le16 mac_tmp = cpu_to_le16(0);
 920
 921                         /* first rate - part of the hw's frame header */
 922                         txc->f.phy_control = phy_set;
 923
 924                         if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)
 925                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
 926
 927                         if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 928                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
 929                         else if (carl9170_tx_cts_check(ar, txrate))
 930                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
 931
 932                         txc->f.mac_control |= mac_tmp;
 933                 } else {
 934                         /* fallback rates are stored in the firmware's
 935                          * retry rate set array.
 936                          */
 937                         txc->s.rr[i - 1] = phy_set;
 938                 }
 939
 940                 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
 941                         txrate->count);
 942
 943                 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 944                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
 945                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 946                 else if (carl9170_tx_cts_check(ar, txrate))
 947                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
 948                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 949
 950                 if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))
 951                         txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;
 952         }
 953 }
 954
 955 static int carl9170_tx_prepare(struct ar9170 *ar,
 956                                struct ieee80211_sta *sta,
 957                                struct sk_buff *skb)
 958 {
 959         struct ieee80211_hdr *hdr;
 960         struct _carl9170_tx_superframe *txc;
 961         struct carl9170_vif_info *cvif;
 962         struct ieee80211_tx_info *info;
 963         struct carl9170_tx_info *arinfo;
 964         unsigned int hw_queue;
 965         __le16 mac_tmp;
 966         u16 len;
 967
 968         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
 969         BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
 970                      CARL9170_TX_SUPERDESC_LEN);
 971
 972         BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
 973                      AR9170_TX_HWDESC_LEN);
 974
 975         BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
 976                 ((CARL9170_TX_SUPER_MISC_VIF_ID >>
 977                  CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
 978
 979         hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
 980
 981         hdr = (void *)skb->data;
 982         info = IEEE80211_SKB_CB(skb);
 983         len = skb->len;
 984
 985         /*
 986          * Note: If the frame was sent through a monitor interface,
 987          * the ieee80211_vif pointer can be NULL.
 988          */
 989         if (likely(info->control.vif))
 990                 cvif = (void *) info->control.vif->drv_priv;
 991         else
 992                 cvif = NULL;
 993
 994         txc = (void *)skb_push(skb, sizeof(*txc));
 995         memset(txc, 0, sizeof(*txc));
 996
 997         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
 998
 999         if (likely(cvif))
1000                 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
1001
1002         if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
1003                 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
1004
1005         if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
1006                 txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;
1007
1008         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
1009                 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
1010
1011         mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
1012                               AR9170_TX_MAC_BACKOFF);
1013         mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
1014                                AR9170_TX_MAC_QOS);
1015
1016         if (unlikely(info->flags & IEEE80211_TX_CTL_NO_ACK))
1017                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
1018
1019         if (info->control.hw_key) {
1020                 len += info->control.hw_key->icv_len;
1021
1022                 switch (info->control.hw_key->cipher) {
1023                 case WLAN_CIPHER_SUITE_WEP40:
1024                 case WLAN_CIPHER_SUITE_WEP104:
1025                 case WLAN_CIPHER_SUITE_TKIP:
1026                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
1027                         break;
1028                 case WLAN_CIPHER_SUITE_CCMP:
1029                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
1030                         break;
1031                 default:
1032                         WARN_ON(1);
1033                         goto err_out;
1034                 }
1035         }
1036
1037         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1038                 unsigned int density, factor;
1039
1040                 if (unlikely(!sta || !cvif))
1041                         goto err_out;
1042
1043                 factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor);
1044                 density = sta->ht_cap.ampdu_density;
1045
1046                 if (density) {
1047                         /*
1048                          * Watch out!
1049                          *
1050                          * Otus uses slightly different density values than
1051                          * those from the 802.11n spec.
1052                          */
1053
1054                         density = max_t(unsigned int, density + 1, 7u);
1055                 }
1056
1057                 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
1058                         txc->s.ampdu_settings, density);
1059
1060                 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
1061                         txc->s.ampdu_settings, factor);
1062         }
1063
1064         txc->s.len = cpu_to_le16(skb->len);
1065         txc->f.length = cpu_to_le16(len + FCS_LEN);
1066         txc->f.mac_control = mac_tmp;
1067
1068         arinfo = (void *)info->rate_driver_data;
1069         arinfo->timeout = jiffies;
1070         arinfo->ar = ar;
1071         kref_init(&arinfo->ref);
1072         return 0;
1073
1074 err_out:
1075         skb_pull(skb, sizeof(*txc));
1076         return -EINVAL;
1077 }
1078
1079 static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
1080 {
1081         struct _carl9170_tx_superframe *super;
1082
1083         super = (void *) skb->data;
1084         super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1085 }
1086
1087 static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1088 {
1089         struct _carl9170_tx_superframe *super;
1090         int tmp;
1091
1092         super = (void *) skb->data;
1093
1094         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1095                 CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1096
1097         /*
1098          * If you haven't noticed carl9170_tx_prepare has already filled
1099          * in all ampdu spacing & factor parameters.
1100          * Now it's the time to check whenever the settings have to be
1101          * updated by the firmware, or if everything is still the same.
1102          *
1103          * There's no sane way to handle different density values with
1104          * this hardware, so we may as well just do the compare in the
1105          * driver.
1106          */
1107
1108         if (tmp != ar->current_density) {
1109                 ar->current_density = tmp;
1110                 super->s.ampdu_settings |=
1111                         CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1112         }
1113
1114         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1115                 CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1116
1117         if (tmp != ar->current_factor) {
1118                 ar->current_factor = tmp;
1119                 super->s.ampdu_settings |=
1120                         CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1121         }
1122 }
1123
1124 static void carl9170_tx_ampdu(struct ar9170 *ar)
1125 {
1126         struct sk_buff_head agg;
1127         struct carl9170_sta_tid *tid_info;
1128         struct sk_buff *skb, *first;
1129         struct ieee80211_tx_info *tx_info_first;
1130         unsigned int i = 0, done_ampdus = 0;
1131         u16 seq, queue, tmpssn;
1132
1133         atomic_inc(&ar->tx_ampdu_scheduler);
1134         ar->tx_ampdu_schedule = false;
1135
1136         if (atomic_read(&ar->tx_ampdu_upload))
1137                 return;
1138
1139         if (!ar->tx_ampdu_list_len)
1140                 return;
1141
1142         __skb_queue_head_init(&agg);
1143
1144         rcu_read_lock();
1145         tid_info = rcu_dereference(ar->tx_ampdu_iter);
1146         if (WARN_ON_ONCE(!tid_info)) {
1147                 rcu_read_unlock();
1148                 return;
1149         }
1150
1151 retry:
1152         list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1153                 i++;
1154
1155                 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1156                         continue;
1157
1158                 queue = TID_TO_WME_AC(tid_info->tid);
1159
1160                 spin_lock_bh(&tid_info->lock);
1161                 if (tid_info->state != CARL9170_TID_STATE_XMIT)
1162                         goto processed;
1163
1164                 tid_info->counter++;
1165                 first = skb_peek(&tid_info->queue);
1166                 tmpssn = carl9170_get_seq(first);
1167                 seq = tid_info->snx;
1168
1169                 if (unlikely(tmpssn != seq)) {
1170                         tid_info->state = CARL9170_TID_STATE_IDLE;
1171
1172                         goto processed;
1173                 }
1174
1175                 tx_info_first = NULL;
1176                 while ((skb = skb_peek(&tid_info->queue))) {
1177                         /* strict 0, 1, ..., n - 1, n frame sequence order */
1178                         if (unlikely(carl9170_get_seq(skb) != seq))
1179                                 break;
1180
1181                         /* don't upload more than AMPDU FACTOR allows. */
1182                         if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1183                             (tid_info->max - 1)))
1184                                 break;
1185
1186                         if (!tx_info_first) {
1187                                 carl9170_tx_get_rates(ar, tid_info->vif,
1188                                                       tid_info->sta, first);
1189                                 tx_info_first = IEEE80211_SKB_CB(first);
1190                         }
1191
1192                         carl9170_tx_apply_rateset(ar, tx_info_first, skb);
1193
1194                         atomic_inc(&ar->tx_ampdu_upload);
1195                         tid_info->snx = seq = SEQ_NEXT(seq);
1196                         __skb_unlink(skb, &tid_info->queue);
1197
1198                         __skb_queue_tail(&agg, skb);
1199
1200                         if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
1201                                 break;
1202                 }
1203
1204                 if (skb_queue_empty(&tid_info->queue) ||
1205                     carl9170_get_seq(skb_peek(&tid_info->queue)) !=
1206                     tid_info->snx) {
1207                         /* stop TID, if A-MPDU frames are still missing,
1208                          * or whenever the queue is empty.
1209                          */
1210
1211                         tid_info->state = CARL9170_TID_STATE_IDLE;
1212                 }
1213                 done_ampdus++;
1214
1215 processed:
1216                 spin_unlock_bh(&tid_info->lock);
1217
1218                 if (skb_queue_empty(&agg))
1219                         continue;
1220
1221                 /* apply ampdu spacing & factor settings */
1222                 carl9170_set_ampdu_params(ar, skb_peek(&agg));
1223
1224                 /* set aggregation push bit */
1225                 carl9170_set_immba(ar, skb_peek_tail(&agg));
1226
1227                 spin_lock_bh(&ar->tx_pending[queue].lock);
1228                 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
1229                 spin_unlock_bh(&ar->tx_pending[queue].lock);
1230                 ar->tx_schedule = true;
1231         }
1232         if ((done_ampdus++ == 0) && (i++ == 0))
1233                 goto retry;
1234
1235         rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1236         rcu_read_unlock();
1237 }
1238
1239 static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1240                                             struct sk_buff_head *queue)
1241 {
1242         struct sk_buff *skb;
1243         struct ieee80211_tx_info *info;
1244         struct carl9170_tx_info *arinfo;
1245
1246         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1247
1248         spin_lock_bh(&queue->lock);
1249         skb = skb_peek(queue);
1250         if (unlikely(!skb))
1251                 goto err_unlock;
1252
1253         if (carl9170_alloc_dev_space(ar, skb))
1254                 goto err_unlock;
1255
1256         __skb_unlink(skb, queue);
1257         spin_unlock_bh(&queue->lock);
1258
1259         info = IEEE80211_SKB_CB(skb);
1260         arinfo = (void *) info->rate_driver_data;
1261
1262         arinfo->timeout = jiffies;
1263         return skb;
1264
1265 err_unlock:
1266         spin_unlock_bh(&queue->lock);
1267         return NULL;
1268 }
1269
1270 void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1271 {
1272         struct _carl9170_tx_superframe *super;
1273         uint8_t q = 0;
1274
1275         ar->tx_dropped++;
1276
1277         super = (void *)skb->data;
1278         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1279                 ar9170_qmap[carl9170_get_queue(ar, skb)]);
1280         __carl9170_tx_process_status(ar, super->s.cookie, q);
1281 }
1282
1283 static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
1284 {
1285         struct ieee80211_sta *sta;
1286         struct carl9170_sta_info *sta_info;
1287         struct ieee80211_tx_info *tx_info;
1288
1289         rcu_read_lock();
1290         sta = __carl9170_get_tx_sta(ar, skb);
1291         if (!sta)
1292                 goto out_rcu;
1293
1294         sta_info = (void *) sta->drv_priv;
1295         tx_info = IEEE80211_SKB_CB(skb);
1296
1297         if (unlikely(sta_info->sleeping) &&
1298             !(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
1299                                 IEEE80211_TX_CTL_CLEAR_PS_FILT))) {
1300                 rcu_read_unlock();
1301
1302                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
1303                         atomic_dec(&ar->tx_ampdu_upload);
1304
1305                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1306                 carl9170_release_dev_space(ar, skb);
1307                 carl9170_tx_status(ar, skb, false);
1308                 return true;
1309         }
1310
1311 out_rcu:
1312         rcu_read_unlock();
1313         return false;
1314 }
1315
1316 static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb)
1317 {
1318         struct _carl9170_tx_superframe *super = (void *) skb->data;
1319         struct ieee80211_bar *bar = (void *) super->frame_data;
1320
1321         if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
1322             skb->len >= sizeof(struct ieee80211_bar)) {
1323                 struct carl9170_bar_list_entry *entry;
1324                 unsigned int queue = skb_get_queue_mapping(skb);
1325
1326                 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1327                 if (!WARN_ON_ONCE(!entry)) {
1328                         entry->skb = skb;
1329                         spin_lock_bh(&ar->bar_list_lock[queue]);
1330                         list_add_tail_rcu(&entry->list, &ar->bar_list[queue]);
1331                         spin_unlock_bh(&ar->bar_list_lock[queue]);
1332                 }
1333         }
1334 }
1335
1336 static void carl9170_tx(struct ar9170 *ar)
1337 {
1338         struct sk_buff *skb;
1339         unsigned int i, q;
1340         bool schedule_garbagecollector = false;
1341
1342         ar->tx_schedule = false;
1343
1344         if (unlikely(!IS_STARTED(ar)))
1345                 return;
1346
1347         carl9170_usb_handle_tx_err(ar);
1348
1349         for (i = 0; i < ar->hw->queues; i++) {
1350                 while (!skb_queue_empty(&ar->tx_pending[i])) {
1351                         skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
1352                         if (unlikely(!skb))
1353                                 break;
1354
1355                         if (unlikely(carl9170_tx_ps_drop(ar, skb)))
1356                                 continue;
1357
1358                         carl9170_bar_check(ar, skb);
1359
1360                         atomic_inc(&ar->tx_total_pending);
1361
1362                         q = __carl9170_get_queue(ar, i);
1363                         /*
1364                          * NB: tx_status[i] vs. tx_status[q],
1365                          * TODO: Move into pick_skb or alloc_dev_space.
1366                          */
1367                         skb_queue_tail(&ar->tx_status[q], skb);
1368
1369                         /*
1370                          * increase ref count to "2".
1371                          * Ref counting is the easiest way to solve the
1372                          * race between the urb's completion routine:
1373                          *      carl9170_tx_callback
1374                          * and wlan tx status functions:
1375                          *      carl9170_tx_status/janitor.
1376                          */
1377                         carl9170_tx_get_skb(skb);
1378
1379                         carl9170_usb_tx(ar, skb);
1380                         schedule_garbagecollector = true;
1381                 }
1382         }
1383
1384         if (!schedule_garbagecollector)
1385                 return;
1386
1387         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
1388                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1389 }
1390
1391 static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1392         struct ieee80211_sta *sta, struct sk_buff *skb,
1393         struct ieee80211_tx_info *txinfo)
1394 {
1395         struct carl9170_sta_info *sta_info;
1396         struct carl9170_sta_tid *agg;
1397         struct sk_buff *iter;
1398         u16 tid, seq, qseq, off;
1399         bool run = false;
1400
1401         tid = carl9170_get_tid(skb);
1402         seq = carl9170_get_seq(skb);
1403         sta_info = (void *) sta->drv_priv;
1404
1405         rcu_read_lock();
1406         agg = rcu_dereference(sta_info->agg[tid]);
1407
1408         if (!agg)
1409                 goto err_unlock_rcu;
1410
1411         spin_lock_bh(&agg->lock);
1412         if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1413                 goto err_unlock;
1414
1415         /* check if sequence is within the BA window */
1416         if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1417                 goto err_unlock;
1418
1419         if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1420                 goto err_unlock;
1421
1422         off = SEQ_DIFF(seq, agg->bsn);
1423         if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1424                 goto err_unlock;
1425
1426         if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1427                 __skb_queue_tail(&agg->queue, skb);
1428                 agg->hsn = seq;
1429                 goto queued;
1430         }
1431
1432         skb_queue_reverse_walk(&agg->queue, iter) {
1433                 qseq = carl9170_get_seq(iter);
1434
1435                 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1436                         __skb_queue_after(&agg->queue, iter, skb);
1437                         goto queued;
1438                 }
1439         }
1440
1441         __skb_queue_head(&agg->queue, skb);
1442 queued:
1443
1444         if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1445                 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
1446                         agg->state = CARL9170_TID_STATE_XMIT;
1447                         run = true;
1448                 }
1449         }
1450
1451         spin_unlock_bh(&agg->lock);
1452         rcu_read_unlock();
1453
1454         return run;
1455
1456 err_unlock:
1457         spin_unlock_bh(&agg->lock);
1458
1459 err_unlock_rcu:
1460         rcu_read_unlock();
1461         txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;
1462         carl9170_tx_status(ar, skb, false);
1463         ar->tx_dropped++;
1464         return false;
1465 }
1466
1467 void carl9170_op_tx(struct ieee80211_hw *hw,
1468                     struct ieee80211_tx_control *control,
1469                     struct sk_buff *skb)
1470 {
1471         struct ar9170 *ar = hw->priv;
1472         struct ieee80211_tx_info *info;
1473         struct ieee80211_sta *sta = control->sta;
1474         struct ieee80211_vif *vif;
1475         bool run;
1476
1477         if (unlikely(!IS_STARTED(ar)))
1478                 goto err_free;
1479
1480         info = IEEE80211_SKB_CB(skb);
1481         vif = info->control.vif;
1482
1483         if (unlikely(carl9170_tx_prepare(ar, sta, skb)))
1484                 goto err_free;
1485
1486         carl9170_tx_accounting(ar, skb);
1487         /*
1488          * from now on, one has to use carl9170_tx_status to free
1489          * all ressouces which are associated with the frame.
1490          */
1491
1492         if (sta) {
1493                 struct carl9170_sta_info *stai = (void *) sta->drv_priv;
1494                 atomic_inc(&stai->pending_frames);
1495         }
1496
1497         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1498                 /* to static code analyzers and reviewers:
1499                  * mac80211 guarantees that a valid "sta"
1500                  * reference is present, if a frame is to
1501                  * be part of an ampdu. Hence any extra
1502                  * sta == NULL checks are redundant in this
1503                  * special case.
1504                  */
1505                 run = carl9170_tx_ampdu_queue(ar, sta, skb, info);
1506                 if (run)
1507                         carl9170_tx_ampdu(ar);
1508
1509         } else {
1510                 unsigned int queue = skb_get_queue_mapping(skb);
1511
1512                 carl9170_tx_get_rates(ar, vif, sta, skb);
1513                 carl9170_tx_apply_rateset(ar, info, skb);
1514                 skb_queue_tail(&ar->tx_pending[queue], skb);
1515         }
1516
1517         carl9170_tx(ar);
1518         return;
1519
1520 err_free:
1521         ar->tx_dropped++;
1522         ieee80211_free_txskb(ar->hw, skb);
1523 }
1524
1525 void carl9170_tx_scheduler(struct ar9170 *ar)
1526 {
1527
1528         if (ar->tx_ampdu_schedule)
1529                 carl9170_tx_ampdu(ar);
1530
1531         if (ar->tx_schedule)
1532                 carl9170_tx(ar);
1533 }
1534
1535 /* caller has to take rcu_read_lock */
1536 static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar)
1537 {
1538         struct carl9170_vif_info *cvif;
1539         int i = 1;
1540
1541         /* The AR9170 hardware has no fancy beacon queue or some
1542          * other scheduling mechanism. So, the driver has to make
1543          * due by setting the two beacon timers (pretbtt and tbtt)
1544          * once and then swapping the beacon address in the HW's
1545          * register file each time the pretbtt fires.
1546          */
1547
1548         cvif = rcu_dereference(ar->beacon_iter);
1549         if (ar->vifs > 0 && cvif) {
1550                 do {
1551                         list_for_each_entry_continue_rcu(cvif, &ar->vif_list,
1552                                                          list) {
1553                                 if (cvif->active && cvif->enable_beacon)
1554                                         goto out;
1555                         }
1556                 } while (ar->beacon_enabled && i--);
1557         }
1558
1559 out:
1560         RCU_INIT_POINTER(ar->beacon_iter, cvif);
1561         return cvif;
1562 }
1563
1564 static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb,
1565                                       u32 *ht1, u32 *plcp)
1566 {
1567         struct ieee80211_tx_info *txinfo;
1568         struct ieee80211_tx_rate *rate;
1569         unsigned int power, chains;
1570         bool ht_rate;
1571
1572         txinfo = IEEE80211_SKB_CB(skb);
1573         rate = &txinfo->control.rates[0];
1574         ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS);
1575         carl9170_tx_rate_tpc_chains(ar, txinfo, rate, plcp, &power, &chains);
1576
1577         *ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;
1578         if (chains == AR9170_TX_PHY_TXCHAIN_2)
1579                 *ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;
1580         SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7);
1581         SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power);
1582         SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains);
1583
1584         if (ht_rate) {
1585                 *ht1 |= AR9170_MAC_BCN_HT1_HT_EN;
1586                 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1587                         *plcp |= AR9170_MAC_BCN_HT2_SGI;
1588
1589                 if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
1590                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;
1591                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1592                 } else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {
1593                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;
1594                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1595                 }
1596
1597                 SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN);
1598         } else {
1599                 if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M)
1600                         *plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
1601                 else
1602                         *plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;
1603         }
1604
1605         return ht_rate;
1606 }
1607
1608 int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
1609 {
1610         struct sk_buff *skb = NULL;
1611         struct carl9170_vif_info *cvif;
1612         __le32 *data, *old = NULL;
1613         u32 word, ht1, plcp, off, addr, len;
1614         int i = 0, err = 0;
1615         bool ht_rate;
1616
1617         rcu_read_lock();
1618         cvif = carl9170_pick_beaconing_vif(ar);
1619         if (!cvif)
1620                 goto out_unlock;
1621
1622         skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
1623                 NULL, NULL);
1624
1625         if (!skb) {
1626                 err = -ENOMEM;
1627                 goto err_free;
1628         }
1629
1630         spin_lock_bh(&ar->beacon_lock);
1631         data = (__le32 *)skb->data;
1632         if (cvif->beacon)
1633                 old = (__le32 *)cvif->beacon->data;
1634
1635         off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
1636         addr = ar->fw.beacon_addr + off;
1637         len = roundup(skb->len + FCS_LEN, 4);
1638
1639         if ((off + len) > ar->fw.beacon_max_len) {
1640                 if (net_ratelimit()) {
1641                         wiphy_err(ar->hw->wiphy, "beacon does not "
1642                                   "fit into device memory!\n");
1643                 }
1644                 err = -EINVAL;
1645                 goto err_unlock;
1646         }
1647
1648         if (len > AR9170_MAC_BCN_LENGTH_MAX) {
1649                 if (net_ratelimit()) {
1650                         wiphy_err(ar->hw->wiphy, "no support for beacons "
1651                                 "bigger than %d (yours:%d).\n",
1652                                  AR9170_MAC_BCN_LENGTH_MAX, len);
1653                 }
1654
1655                 err = -EMSGSIZE;
1656                 goto err_unlock;
1657         }
1658
1659         ht_rate = carl9170_tx_beacon_physet(ar, skb, &ht1, &plcp);
1660
1661         carl9170_async_regwrite_begin(ar);
1662         carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);
1663         if (ht_rate)
1664                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);
1665         else
1666                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);
1667
1668         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
1669                 /*
1670                  * XXX: This accesses beyond skb data for up
1671                  *      to the last 3 bytes!!
1672                  */
1673
1674                 if (old && (data[i] == old[i]))
1675                         continue;
1676
1677                 word = le32_to_cpu(data[i]);
1678                 carl9170_async_regwrite(addr + 4 * i, word);
1679         }
1680         carl9170_async_regwrite_finish();
1681
1682         dev_kfree_skb_any(cvif->beacon);
1683         cvif->beacon = NULL;
1684
1685         err = carl9170_async_regwrite_result();
1686         if (!err)
1687                 cvif->beacon = skb;
1688         spin_unlock_bh(&ar->beacon_lock);
1689         if (err)
1690                 goto err_free;
1691
1692         if (submit) {
1693                 err = carl9170_bcn_ctrl(ar, cvif->id,
1694                                         CARL9170_BCN_CTRL_CAB_TRIGGER,
1695                                         addr, skb->len + FCS_LEN);
1696
1697                 if (err)
1698                         goto err_free;
1699         }
1700 out_unlock:
1701         rcu_read_unlock();
1702         return 0;
1703
1704 err_unlock:
1705         spin_unlock_bh(&ar->beacon_lock);
1706
1707 err_free:
1708         rcu_read_unlock();
1709         dev_kfree_skb_any(skb);
1710         return err;
1711 }