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.ack_signal) != 20);
 281
 282         memset(&txinfo->status.ack_signal, 0,
 283                sizeof(struct ieee80211_tx_info) -
 284                offsetof(struct ieee80211_tx_info, status.ack_signal));
 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                            !(txinfo->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
 301                         /*
 302                          * drop redundant tx_status reports:
 303                          *
 304                          * 1. ampdu_ack_len of the final tx_status does
 305                          *    include the feedback of this particular frame.
 306                          *
 307                          * 2. tx_status_irqsafe only queues up to 128
 308                          *    tx feedback reports and discards the rest.
 309                          *
 310                          * 3. minstrel_ht is picky, it only accepts
 311                          *    reports of frames with the TX_STATUS_AMPDU flag.
 312                          *
 313                          * 4. mac80211 is not particularly interested in
 314                          *    feedback either [CTL_REQ_TX_STATUS not set]
 315                          */
 316
 317                         ieee80211_free_txskb(ar->hw, skb);
 318                         return;
 319                 } else {
 320                         /*
 321                          * Either the frame transmission has failed or
 322                          * mac80211 requested tx status.
 323                          */
 324                 }
 325         }
 326
 327         skb_pull(skb, sizeof(struct _carl9170_tx_superframe));
 328         ieee80211_tx_status_irqsafe(ar->hw, skb);
 329 }
 330
 331 void carl9170_tx_get_skb(struct sk_buff *skb)
 332 {
 333         struct carl9170_tx_info *arinfo = (void *)
 334                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 335         kref_get(&arinfo->ref);
 336 }
 337
 338 int carl9170_tx_put_skb(struct sk_buff *skb)
 339 {
 340         struct carl9170_tx_info *arinfo = (void *)
 341                 (IEEE80211_SKB_CB(skb))->rate_driver_data;
 342
 343         return kref_put(&arinfo->ref, carl9170_tx_release);
 344 }
 345
 346 /* Caller must hold the tid_info->lock & rcu_read_lock */
 347 static void carl9170_tx_shift_bm(struct ar9170 *ar,
 348         struct carl9170_sta_tid *tid_info, u16 seq)
 349 {
 350         u16 off;
 351
 352         off = SEQ_DIFF(seq, tid_info->bsn);
 353
 354         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 355                 return;
 356
 357         /*
 358          * Sanity check. For each MPDU we set the bit in bitmap and
 359          * clear it once we received the tx_status.
 360          * But if the bit is already cleared then we've been bitten
 361          * by a bug.
 362          */
 363         WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
 364
 365         off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
 366         if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
 367                 return;
 368
 369         if (!bitmap_empty(tid_info->bitmap, off))
 370                 off = find_first_bit(tid_info->bitmap, off);
 371
 372         tid_info->bsn += off;
 373         tid_info->bsn &= 0x0fff;
 374
 375         bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,
 376                            off, CARL9170_BAW_BITS);
 377 }
 378
 379 static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
 380         struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
 381 {
 382         struct _carl9170_tx_superframe *super = (void *) skb->data;
 383         struct ieee80211_hdr *hdr = (void *) super->frame_data;
 384         struct ieee80211_sta *sta;
 385         struct carl9170_sta_info *sta_info;
 386         struct carl9170_sta_tid *tid_info;
 387         u8 tid;
 388
 389         if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
 390             txinfo->flags & IEEE80211_TX_CTL_INJECTED)
 391                 return;
 392
 393         rcu_read_lock();
 394         sta = __carl9170_get_tx_sta(ar, skb);
 395         if (unlikely(!sta))
 396                 goto out_rcu;
 397
 398         tid = get_tid_h(hdr);
 399
 400         sta_info = (void *) sta->drv_priv;
 401         tid_info = rcu_dereference(sta_info->agg[tid]);
 402         if (!tid_info)
 403                 goto out_rcu;
 404
 405         spin_lock_bh(&tid_info->lock);
 406         if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
 407                 carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));
 408
 409         if (sta_info->stats[tid].clear) {
 410                 sta_info->stats[tid].clear = false;
 411                 sta_info->stats[tid].req = false;
 412                 sta_info->stats[tid].ampdu_len = 0;
 413                 sta_info->stats[tid].ampdu_ack_len = 0;
 414         }
 415
 416         sta_info->stats[tid].ampdu_len++;
 417         if (txinfo->status.rates[0].count == 1)
 418                 sta_info->stats[tid].ampdu_ack_len++;
 419
 420         if (!(txinfo->flags & IEEE80211_TX_STAT_ACK))
 421                 sta_info->stats[tid].req = true;
 422
 423         if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
 424                 super->s.rix = sta_info->stats[tid].ampdu_len;
 425                 super->s.cnt = sta_info->stats[tid].ampdu_ack_len;
 426                 txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
 427                 if (sta_info->stats[tid].req)
 428                         txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 429
 430                 sta_info->stats[tid].clear = true;
 431         }
 432         spin_unlock_bh(&tid_info->lock);
 433
 434 out_rcu:
 435         rcu_read_unlock();
 436 }
 437
 438 static void carl9170_tx_bar_status(struct ar9170 *ar, struct sk_buff *skb,
 439         struct ieee80211_tx_info *tx_info)
 440 {
 441         struct _carl9170_tx_superframe *super = (void *) skb->data;
 442         struct ieee80211_bar *bar = (void *) super->frame_data;
 443
 444         /*
 445          * Unlike all other frames, the status report for BARs does
 446          * not directly come from the hardware as it is incapable of
 447          * matching a BA to a previously send BAR.
 448          * Instead the RX-path will scan for incoming BAs and set the
 449          * IEEE80211_TX_STAT_ACK if it sees one that was likely
 450          * caused by a BAR from us.
 451          */
 452
 453         if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
 454            !(tx_info->flags & IEEE80211_TX_STAT_ACK)) {
 455                 struct carl9170_bar_list_entry *entry;
 456                 int queue = skb_get_queue_mapping(skb);
 457
 458                 rcu_read_lock();
 459                 list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) {
 460                         if (entry->skb == skb) {
 461                                 spin_lock_bh(&ar->bar_list_lock[queue]);
 462                                 list_del_rcu(&entry->list);
 463                                 spin_unlock_bh(&ar->bar_list_lock[queue]);
 464                                 kfree_rcu(entry, head);
 465                                 goto out;
 466                         }
 467                 }
 468
 469                 WARN(1, "bar not found in %d - ra:%pM ta:%pM c:%x ssn:%x\n",
 470                        queue, bar->ra, bar->ta, bar->control,
 471                         bar->start_seq_num);
 472 out:
 473                 rcu_read_unlock();
 474         }
 475 }
 476
 477 void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
 478                         const bool success)
 479 {
 480         struct ieee80211_tx_info *txinfo;
 481
 482         carl9170_tx_accounting_free(ar, skb);
 483
 484         txinfo = IEEE80211_SKB_CB(skb);
 485
 486         carl9170_tx_bar_status(ar, skb, txinfo);
 487
 488         if (success)
 489                 txinfo->flags |= IEEE80211_TX_STAT_ACK;
 490         else
 491                 ar->tx_ack_failures++;
 492
 493         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 494                 carl9170_tx_status_process_ampdu(ar, skb, txinfo);
 495
 496         carl9170_tx_ps_unblock(ar, skb);
 497         carl9170_tx_put_skb(skb);
 498 }
 499
 500 /* This function may be called form any context */
 501 void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
 502 {
 503         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 504
 505         atomic_dec(&ar->tx_total_pending);
 506
 507         if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
 508                 atomic_dec(&ar->tx_ampdu_upload);
 509
 510         if (carl9170_tx_put_skb(skb))
 511                 tasklet_hi_schedule(&ar->usb_tasklet);
 512 }
 513
 514 static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
 515                                                struct sk_buff_head *queue)
 516 {
 517         struct sk_buff *skb;
 518
 519         spin_lock_bh(&queue->lock);
 520         skb_queue_walk(queue, skb) {
 521                 struct _carl9170_tx_superframe *txc = (void *) skb->data;
 522
 523                 if (txc->s.cookie != cookie)
 524                         continue;
 525
 526                 __skb_unlink(skb, queue);
 527                 spin_unlock_bh(&queue->lock);
 528
 529                 carl9170_release_dev_space(ar, skb);
 530                 return skb;
 531         }
 532         spin_unlock_bh(&queue->lock);
 533
 534         return NULL;
 535 }
 536
 537 static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
 538         unsigned int tries, struct ieee80211_tx_info *txinfo)
 539 {
 540         unsigned int i;
 541
 542         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 543                 if (txinfo->status.rates[i].idx < 0)
 544                         break;
 545
 546                 if (i == rix) {
 547                         txinfo->status.rates[i].count = tries;
 548                         i++;
 549                         break;
 550                 }
 551         }
 552
 553         for (; i < IEEE80211_TX_MAX_RATES; i++) {
 554                 txinfo->status.rates[i].idx = -1;
 555                 txinfo->status.rates[i].count = 0;
 556         }
 557 }
 558
 559 static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
 560 {
 561         int i;
 562         struct sk_buff *skb;
 563         struct ieee80211_tx_info *txinfo;
 564         struct carl9170_tx_info *arinfo;
 565         bool restart = false;
 566
 567         for (i = 0; i < ar->hw->queues; i++) {
 568                 spin_lock_bh(&ar->tx_status[i].lock);
 569
 570                 skb = skb_peek(&ar->tx_status[i]);
 571
 572                 if (!skb)
 573                         goto next;
 574
 575                 txinfo = IEEE80211_SKB_CB(skb);
 576                 arinfo = (void *) txinfo->rate_driver_data;
 577
 578                 if (time_is_before_jiffies(arinfo->timeout +
 579                     msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
 580                         restart = true;
 581
 582 next:
 583                 spin_unlock_bh(&ar->tx_status[i].lock);
 584         }
 585
 586         if (restart) {
 587                 /*
 588                  * At least one queue has been stuck for long enough.
 589                  * Give the device a kick and hope it gets back to
 590                  * work.
 591                  *
 592                  * possible reasons may include:
 593                  *  - frames got lost/corrupted (bad connection to the device)
 594                  *  - stalled rx processing/usb controller hiccups
 595                  *  - firmware errors/bugs
 596                  *  - every bug you can think of.
 597                  *  - all bugs you can't...
 598                  *  - ...
 599                  */
 600                 carl9170_restart(ar, CARL9170_RR_STUCK_TX);
 601         }
 602 }
 603
 604 static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)
 605 {
 606         struct carl9170_sta_tid *iter;
 607         struct sk_buff *skb;
 608         struct ieee80211_tx_info *txinfo;
 609         struct carl9170_tx_info *arinfo;
 610         struct ieee80211_sta *sta;
 611
 612         rcu_read_lock();
 613         list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {
 614                 if (iter->state < CARL9170_TID_STATE_IDLE)
 615                         continue;
 616
 617                 spin_lock_bh(&iter->lock);
 618                 skb = skb_peek(&iter->queue);
 619                 if (!skb)
 620                         goto unlock;
 621
 622                 txinfo = IEEE80211_SKB_CB(skb);
 623                 arinfo = (void *)txinfo->rate_driver_data;
 624                 if (time_is_after_jiffies(arinfo->timeout +
 625                     msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))
 626                         goto unlock;
 627
 628                 sta = __carl9170_get_tx_sta(ar, skb);
 629                 if (WARN_ON(!sta))
 630                         goto unlock;
 631
 632                 ieee80211_stop_tx_ba_session(sta, iter->tid);
 633 unlock:
 634                 spin_unlock_bh(&iter->lock);
 635
 636         }
 637         rcu_read_unlock();
 638 }
 639
 640 void carl9170_tx_janitor(struct work_struct *work)
 641 {
 642         struct ar9170 *ar = container_of(work, struct ar9170,
 643                                          tx_janitor.work);
 644         if (!IS_STARTED(ar))
 645                 return;
 646
 647         ar->tx_janitor_last_run = jiffies;
 648
 649         carl9170_check_queue_stop_timeout(ar);
 650         carl9170_tx_ampdu_timeout(ar);
 651
 652         if (!atomic_read(&ar->tx_total_queued))
 653                 return;
 654
 655         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
 656                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
 657 }
 658
 659 static void __carl9170_tx_process_status(struct ar9170 *ar,
 660         const uint8_t cookie, const uint8_t info)
 661 {
 662         struct sk_buff *skb;
 663         struct ieee80211_tx_info *txinfo;
 664         unsigned int r, t, q;
 665         bool success = true;
 666
 667         q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE];
 668
 669         skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);
 670         if (!skb) {
 671                 /*
 672                  * We have lost the race to another thread.
 673                  */
 674
 675                 return ;
 676         }
 677
 678         txinfo = IEEE80211_SKB_CB(skb);
 679
 680         if (!(info & CARL9170_TX_STATUS_SUCCESS))
 681                 success = false;
 682
 683         r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
 684         t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
 685
 686         carl9170_tx_fill_rateinfo(ar, r, t, txinfo);
 687         carl9170_tx_status(ar, skb, success);
 688 }
 689
 690 void carl9170_tx_process_status(struct ar9170 *ar,
 691                                 const struct carl9170_rsp *cmd)
 692 {
 693         unsigned int i;
 694
 695         for (i = 0;  i < cmd->hdr.ext; i++) {
 696                 if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
 697                         print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
 698                                              (void *) cmd, cmd->hdr.len + 4);
 699                         break;
 700                 }
 701
 702                 __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,
 703                                              cmd->_tx_status[i].info);
 704         }
 705 }
 706
 707 static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar,
 708         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate,
 709         unsigned int *phyrate, unsigned int *tpc, unsigned int *chains)
 710 {
 711         struct ieee80211_rate *rate = NULL;
 712         u8 *txpower;
 713         unsigned int idx;
 714
 715         idx = txrate->idx;
 716         *tpc = 0;
 717         *phyrate = 0;
 718
 719         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 720                 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
 721                         /* +1 dBm for HT40 */
 722                         *tpc += 2;
 723
 724                         if (info->band == IEEE80211_BAND_2GHZ)
 725                                 txpower = ar->power_2G_ht40;
 726                         else
 727                                 txpower = ar->power_5G_ht40;
 728                 } else {
 729                         if (info->band == IEEE80211_BAND_2GHZ)
 730                                 txpower = ar->power_2G_ht20;
 731                         else
 732                                 txpower = ar->power_5G_ht20;
 733                 }
 734
 735                 *phyrate = txrate->idx;
 736                 *tpc += txpower[idx & 7];
 737         } else {
 738                 if (info->band == IEEE80211_BAND_2GHZ) {
 739                         if (idx < 4)
 740                                 txpower = ar->power_2G_cck;
 741                         else
 742                                 txpower = ar->power_2G_ofdm;
 743                 } else {
 744                         txpower = ar->power_5G_leg;
 745                         idx += 4;
 746                 }
 747
 748                 rate = &__carl9170_ratetable[idx];
 749                 *tpc += txpower[(rate->hw_value & 0x30) >> 4];
 750                 *phyrate = rate->hw_value & 0xf;
 751         }
 752
 753         if (ar->eeprom.tx_mask == 1) {
 754                 *chains = AR9170_TX_PHY_TXCHAIN_1;
 755         } else {
 756                 if (!(txrate->flags & IEEE80211_TX_RC_MCS) &&
 757                     rate && rate->bitrate >= 360)
 758                         *chains = AR9170_TX_PHY_TXCHAIN_1;
 759                 else
 760                         *chains = AR9170_TX_PHY_TXCHAIN_2;
 761         }
 762
 763         *tpc = min_t(unsigned int, *tpc, ar->hw->conf.power_level * 2);
 764 }
 765
 766 static __le32 carl9170_tx_physet(struct ar9170 *ar,
 767         struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
 768 {
 769         unsigned int power = 0, chains = 0, phyrate = 0;
 770         __le32 tmp;
 771
 772         tmp = cpu_to_le32(0);
 773
 774         if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 775                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
 776                         AR9170_TX_PHY_BW_S);
 777         /* this works because 40 MHz is 2 and dup is 3 */
 778         if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
 779                 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
 780                         AR9170_TX_PHY_BW_S);
 781
 782         if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
 783                 tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
 784
 785         if (txrate->flags & IEEE80211_TX_RC_MCS) {
 786                 SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx);
 787
 788                 /* heavy clip control */
 789                 tmp |= cpu_to_le32((txrate->idx & 0x7) <<
 790                         AR9170_TX_PHY_TX_HEAVY_CLIP_S);
 791
 792                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
 793
 794                 /*
 795                  * green field preamble does not work.
 796                  *
 797                  * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
 798                  * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
 799                  */
 800         } else {
 801                 if (info->band == IEEE80211_BAND_2GHZ) {
 802                         if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M)
 803                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK);
 804                         else
 805                                 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 806                 } else {
 807                         tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
 808                 }
 809
 810                 /*
 811                  * short preamble seems to be broken too.
 812                  *
 813                  * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 814                  *      tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
 815                  */
 816         }
 817         carl9170_tx_rate_tpc_chains(ar, info, txrate,
 818                                     &phyrate, &power, &chains);
 819
 820         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate));
 821         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power));
 822         tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains));
 823         return tmp;
 824 }
 825
 826 static bool carl9170_tx_rts_check(struct ar9170 *ar,
 827                                   struct ieee80211_tx_rate *rate,
 828                                   bool ampdu, bool multi)
 829 {
 830         switch (ar->erp_mode) {
 831         case CARL9170_ERP_AUTO:
 832                 if (ampdu)
 833                         break;
 834
 835         case CARL9170_ERP_MAC80211:
 836                 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
 837                         break;
 838
 839         case CARL9170_ERP_RTS:
 840                 if (likely(!multi))
 841                         return true;
 842
 843         default:
 844                 break;
 845         }
 846
 847         return false;
 848 }
 849
 850 static bool carl9170_tx_cts_check(struct ar9170 *ar,
 851                                   struct ieee80211_tx_rate *rate)
 852 {
 853         switch (ar->erp_mode) {
 854         case CARL9170_ERP_AUTO:
 855         case CARL9170_ERP_MAC80211:
 856                 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 857                         break;
 858
 859         case CARL9170_ERP_CTS:
 860                 return true;
 861
 862         default:
 863                 break;
 864         }
 865
 866         return false;
 867 }
 868
 869 static int carl9170_tx_prepare(struct ar9170 *ar,
 870                                struct ieee80211_sta *sta,
 871                                struct sk_buff *skb)
 872 {
 873         struct ieee80211_hdr *hdr;
 874         struct _carl9170_tx_superframe *txc;
 875         struct carl9170_vif_info *cvif;
 876         struct ieee80211_tx_info *info;
 877         struct ieee80211_tx_rate *txrate;
 878         struct carl9170_tx_info *arinfo;
 879         unsigned int hw_queue;
 880         int i;
 881         __le16 mac_tmp;
 882         u16 len;
 883         bool ampdu, no_ack;
 884
 885         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
 886         BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
 887                      CARL9170_TX_SUPERDESC_LEN);
 888
 889         BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
 890                      AR9170_TX_HWDESC_LEN);
 891
 892         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
 893
 894         BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
 895                 ((CARL9170_TX_SUPER_MISC_VIF_ID >>
 896                  CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
 897
 898         hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
 899
 900         hdr = (void *)skb->data;
 901         info = IEEE80211_SKB_CB(skb);
 902         len = skb->len;
 903
 904         /*
 905          * Note: If the frame was sent through a monitor interface,
 906          * the ieee80211_vif pointer can be NULL.
 907          */
 908         if (likely(info->control.vif))
 909                 cvif = (void *) info->control.vif->drv_priv;
 910         else
 911                 cvif = NULL;
 912
 913         txc = (void *)skb_push(skb, sizeof(*txc));
 914         memset(txc, 0, sizeof(*txc));
 915
 916         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
 917
 918         if (likely(cvif))
 919                 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
 920
 921         if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
 922                 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
 923
 924         if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
 925                 txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;
 926
 927         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
 928                 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
 929
 930         mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
 931                               AR9170_TX_MAC_BACKOFF);
 932         mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
 933                                AR9170_TX_MAC_QOS);
 934
 935         no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
 936         if (unlikely(no_ack))
 937                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
 938
 939         if (info->control.hw_key) {
 940                 len += info->control.hw_key->icv_len;
 941
 942                 switch (info->control.hw_key->cipher) {
 943                 case WLAN_CIPHER_SUITE_WEP40:
 944                 case WLAN_CIPHER_SUITE_WEP104:
 945                 case WLAN_CIPHER_SUITE_TKIP:
 946                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
 947                         break;
 948                 case WLAN_CIPHER_SUITE_CCMP:
 949                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
 950                         break;
 951                 default:
 952                         WARN_ON(1);
 953                         goto err_out;
 954                 }
 955         }
 956
 957         ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
 958         if (ampdu) {
 959                 unsigned int density, factor;
 960
 961                 if (unlikely(!sta || !cvif))
 962                         goto err_out;
 963
 964                 factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor);
 965                 density = sta->ht_cap.ampdu_density;
 966
 967                 if (density) {
 968                         /*
 969                          * Watch out!
 970                          *
 971                          * Otus uses slightly different density values than
 972                          * those from the 802.11n spec.
 973                          */
 974
 975                         density = max_t(unsigned int, density + 1, 7u);
 976                 }
 977
 978                 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
 979                         txc->s.ampdu_settings, density);
 980
 981                 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
 982                         txc->s.ampdu_settings, factor);
 983         }
 984
 985         /*
 986          * NOTE: For the first rate, the ERP & AMPDU flags are directly
 987          * taken from mac_control. For all fallback rate, the firmware
 988          * updates the mac_control flags from the rate info field.
 989          */
 990         for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
 991                 __le32 phy_set;
 992                 txrate = &info->control.rates[i];
 993                 if (txrate->idx < 0)
 994                         break;
 995
 996                 phy_set = carl9170_tx_physet(ar, info, txrate);
 997                 if (i == 0) {
 998                         /* first rate - part of the hw's frame header */
 999                         txc->f.phy_control = phy_set;
1000
1001                         if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)
1002                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
1003                         if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
1004                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
1005                         else if (carl9170_tx_cts_check(ar, txrate))
1006                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
1007
1008                 } else {
1009                         /* fallback rates are stored in the firmware's
1010                          * retry rate set array.
1011                          */
1012                         txc->s.rr[i - 1] = phy_set;
1013                 }
1014
1015                 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
1016                         txrate->count);
1017
1018                 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
1019                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
1020                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
1021                 else if (carl9170_tx_cts_check(ar, txrate))
1022                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
1023                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
1024
1025                 if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))
1026                         txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;
1027         }
1028
1029         txc->s.len = cpu_to_le16(skb->len);
1030         txc->f.length = cpu_to_le16(len + FCS_LEN);
1031         txc->f.mac_control = mac_tmp;
1032
1033         arinfo = (void *)info->rate_driver_data;
1034         arinfo->timeout = jiffies;
1035         arinfo->ar = ar;
1036         kref_init(&arinfo->ref);
1037         return 0;
1038
1039 err_out:
1040         skb_pull(skb, sizeof(*txc));
1041         return -EINVAL;
1042 }
1043
1044 static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
1045 {
1046         struct _carl9170_tx_superframe *super;
1047
1048         super = (void *) skb->data;
1049         super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1050 }
1051
1052 static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1053 {
1054         struct _carl9170_tx_superframe *super;
1055         int tmp;
1056
1057         super = (void *) skb->data;
1058
1059         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1060                 CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1061
1062         /*
1063          * If you haven't noticed carl9170_tx_prepare has already filled
1064          * in all ampdu spacing & factor parameters.
1065          * Now it's the time to check whenever the settings have to be
1066          * updated by the firmware, or if everything is still the same.
1067          *
1068          * There's no sane way to handle different density values with
1069          * this hardware, so we may as well just do the compare in the
1070          * driver.
1071          */
1072
1073         if (tmp != ar->current_density) {
1074                 ar->current_density = tmp;
1075                 super->s.ampdu_settings |=
1076                         CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1077         }
1078
1079         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1080                 CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1081
1082         if (tmp != ar->current_factor) {
1083                 ar->current_factor = tmp;
1084                 super->s.ampdu_settings |=
1085                         CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1086         }
1087 }
1088
1089 static bool carl9170_tx_rate_check(struct ar9170 *ar, struct sk_buff *_dest,
1090                                    struct sk_buff *_src)
1091 {
1092         struct _carl9170_tx_superframe *dest, *src;
1093
1094         dest = (void *) _dest->data;
1095         src = (void *) _src->data;
1096
1097         /*
1098          * The mac80211 rate control algorithm expects that all MPDUs in
1099          * an AMPDU share the same tx vectors.
1100          * This is not really obvious right now, because the hardware
1101          * does the AMPDU setup according to its own rulebook.
1102          * Our nicely assembled, strictly monotonic increasing mpdu
1103          * chains will be broken up, mashed back together...
1104          */
1105
1106         return (dest->f.phy_control == src->f.phy_control);
1107 }
1108
1109 static void carl9170_tx_ampdu(struct ar9170 *ar)
1110 {
1111         struct sk_buff_head agg;
1112         struct carl9170_sta_tid *tid_info;
1113         struct sk_buff *skb, *first;
1114         unsigned int i = 0, done_ampdus = 0;
1115         u16 seq, queue, tmpssn;
1116
1117         atomic_inc(&ar->tx_ampdu_scheduler);
1118         ar->tx_ampdu_schedule = false;
1119
1120         if (atomic_read(&ar->tx_ampdu_upload))
1121                 return;
1122
1123         if (!ar->tx_ampdu_list_len)
1124                 return;
1125
1126         __skb_queue_head_init(&agg);
1127
1128         rcu_read_lock();
1129         tid_info = rcu_dereference(ar->tx_ampdu_iter);
1130         if (WARN_ON_ONCE(!tid_info)) {
1131                 rcu_read_unlock();
1132                 return;
1133         }
1134
1135 retry:
1136         list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1137                 i++;
1138
1139                 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1140                         continue;
1141
1142                 queue = TID_TO_WME_AC(tid_info->tid);
1143
1144                 spin_lock_bh(&tid_info->lock);
1145                 if (tid_info->state != CARL9170_TID_STATE_XMIT)
1146                         goto processed;
1147
1148                 tid_info->counter++;
1149                 first = skb_peek(&tid_info->queue);
1150                 tmpssn = carl9170_get_seq(first);
1151                 seq = tid_info->snx;
1152
1153                 if (unlikely(tmpssn != seq)) {
1154                         tid_info->state = CARL9170_TID_STATE_IDLE;
1155
1156                         goto processed;
1157                 }
1158
1159                 while ((skb = skb_peek(&tid_info->queue))) {
1160                         /* strict 0, 1, ..., n - 1, n frame sequence order */
1161                         if (unlikely(carl9170_get_seq(skb) != seq))
1162                                 break;
1163
1164                         /* don't upload more than AMPDU FACTOR allows. */
1165                         if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1166                             (tid_info->max - 1)))
1167                                 break;
1168
1169                         if (!carl9170_tx_rate_check(ar, skb, first))
1170                                 break;
1171
1172                         atomic_inc(&ar->tx_ampdu_upload);
1173                         tid_info->snx = seq = SEQ_NEXT(seq);
1174                         __skb_unlink(skb, &tid_info->queue);
1175
1176                         __skb_queue_tail(&agg, skb);
1177
1178                         if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
1179                                 break;
1180                 }
1181
1182                 if (skb_queue_empty(&tid_info->queue) ||
1183                     carl9170_get_seq(skb_peek(&tid_info->queue)) !=
1184                     tid_info->snx) {
1185                         /*
1186                          * stop TID, if A-MPDU frames are still missing,
1187                          * or whenever the queue is empty.
1188                          */
1189
1190                         tid_info->state = CARL9170_TID_STATE_IDLE;
1191                 }
1192                 done_ampdus++;
1193
1194 processed:
1195                 spin_unlock_bh(&tid_info->lock);
1196
1197                 if (skb_queue_empty(&agg))
1198                         continue;
1199
1200                 /* apply ampdu spacing & factor settings */
1201                 carl9170_set_ampdu_params(ar, skb_peek(&agg));
1202
1203                 /* set aggregation push bit */
1204                 carl9170_set_immba(ar, skb_peek_tail(&agg));
1205
1206                 spin_lock_bh(&ar->tx_pending[queue].lock);
1207                 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
1208                 spin_unlock_bh(&ar->tx_pending[queue].lock);
1209                 ar->tx_schedule = true;
1210         }
1211         if ((done_ampdus++ == 0) && (i++ == 0))
1212                 goto retry;
1213
1214         rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1215         rcu_read_unlock();
1216 }
1217
1218 static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1219                                             struct sk_buff_head *queue)
1220 {
1221         struct sk_buff *skb;
1222         struct ieee80211_tx_info *info;
1223         struct carl9170_tx_info *arinfo;
1224
1225         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1226
1227         spin_lock_bh(&queue->lock);
1228         skb = skb_peek(queue);
1229         if (unlikely(!skb))
1230                 goto err_unlock;
1231
1232         if (carl9170_alloc_dev_space(ar, skb))
1233                 goto err_unlock;
1234
1235         __skb_unlink(skb, queue);
1236         spin_unlock_bh(&queue->lock);
1237
1238         info = IEEE80211_SKB_CB(skb);
1239         arinfo = (void *) info->rate_driver_data;
1240
1241         arinfo->timeout = jiffies;
1242         return skb;
1243
1244 err_unlock:
1245         spin_unlock_bh(&queue->lock);
1246         return NULL;
1247 }
1248
1249 void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1250 {
1251         struct _carl9170_tx_superframe *super;
1252         uint8_t q = 0;
1253
1254         ar->tx_dropped++;
1255
1256         super = (void *)skb->data;
1257         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1258                 ar9170_qmap[carl9170_get_queue(ar, skb)]);
1259         __carl9170_tx_process_status(ar, super->s.cookie, q);
1260 }
1261
1262 static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
1263 {
1264         struct ieee80211_sta *sta;
1265         struct carl9170_sta_info *sta_info;
1266         struct ieee80211_tx_info *tx_info;
1267
1268         rcu_read_lock();
1269         sta = __carl9170_get_tx_sta(ar, skb);
1270         if (!sta)
1271                 goto out_rcu;
1272
1273         sta_info = (void *) sta->drv_priv;
1274         tx_info = IEEE80211_SKB_CB(skb);
1275
1276         if (unlikely(sta_info->sleeping) &&
1277             !(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
1278                                 IEEE80211_TX_CTL_CLEAR_PS_FILT))) {
1279                 rcu_read_unlock();
1280
1281                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
1282                         atomic_dec(&ar->tx_ampdu_upload);
1283
1284                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1285                 carl9170_release_dev_space(ar, skb);
1286                 carl9170_tx_status(ar, skb, false);
1287                 return true;
1288         }
1289
1290 out_rcu:
1291         rcu_read_unlock();
1292         return false;
1293 }
1294
1295 static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb)
1296 {
1297         struct _carl9170_tx_superframe *super = (void *) skb->data;
1298         struct ieee80211_bar *bar = (void *) super->frame_data;
1299
1300         if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
1301             skb->len >= sizeof(struct ieee80211_bar)) {
1302                 struct carl9170_bar_list_entry *entry;
1303                 unsigned int queue = skb_get_queue_mapping(skb);
1304
1305                 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1306                 if (!WARN_ON_ONCE(!entry)) {
1307                         entry->skb = skb;
1308                         spin_lock_bh(&ar->bar_list_lock[queue]);
1309                         list_add_tail_rcu(&entry->list, &ar->bar_list[queue]);
1310                         spin_unlock_bh(&ar->bar_list_lock[queue]);
1311                 }
1312         }
1313 }
1314
1315 static void carl9170_tx(struct ar9170 *ar)
1316 {
1317         struct sk_buff *skb;
1318         unsigned int i, q;
1319         bool schedule_garbagecollector = false;
1320
1321         ar->tx_schedule = false;
1322
1323         if (unlikely(!IS_STARTED(ar)))
1324                 return;
1325
1326         carl9170_usb_handle_tx_err(ar);
1327
1328         for (i = 0; i < ar->hw->queues; i++) {
1329                 while (!skb_queue_empty(&ar->tx_pending[i])) {
1330                         skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
1331                         if (unlikely(!skb))
1332                                 break;
1333
1334                         if (unlikely(carl9170_tx_ps_drop(ar, skb)))
1335                                 continue;
1336
1337                         carl9170_bar_check(ar, skb);
1338
1339                         atomic_inc(&ar->tx_total_pending);
1340
1341                         q = __carl9170_get_queue(ar, i);
1342                         /*
1343                          * NB: tx_status[i] vs. tx_status[q],
1344                          * TODO: Move into pick_skb or alloc_dev_space.
1345                          */
1346                         skb_queue_tail(&ar->tx_status[q], skb);
1347
1348                         /*
1349                          * increase ref count to "2".
1350                          * Ref counting is the easiest way to solve the
1351                          * race between the urb's completion routine:
1352                          *      carl9170_tx_callback
1353                          * and wlan tx status functions:
1354                          *      carl9170_tx_status/janitor.
1355                          */
1356                         carl9170_tx_get_skb(skb);
1357
1358                         carl9170_usb_tx(ar, skb);
1359                         schedule_garbagecollector = true;
1360                 }
1361         }
1362
1363         if (!schedule_garbagecollector)
1364                 return;
1365
1366         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
1367                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1368 }
1369
1370 static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1371         struct ieee80211_sta *sta, struct sk_buff *skb,
1372         struct ieee80211_tx_info *txinfo)
1373 {
1374         struct carl9170_sta_info *sta_info;
1375         struct carl9170_sta_tid *agg;
1376         struct sk_buff *iter;
1377         u16 tid, seq, qseq, off;
1378         bool run = false;
1379
1380         tid = carl9170_get_tid(skb);
1381         seq = carl9170_get_seq(skb);
1382         sta_info = (void *) sta->drv_priv;
1383
1384         rcu_read_lock();
1385         agg = rcu_dereference(sta_info->agg[tid]);
1386
1387         if (!agg)
1388                 goto err_unlock_rcu;
1389
1390         spin_lock_bh(&agg->lock);
1391         if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1392                 goto err_unlock;
1393
1394         /* check if sequence is within the BA window */
1395         if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1396                 goto err_unlock;
1397
1398         if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1399                 goto err_unlock;
1400
1401         off = SEQ_DIFF(seq, agg->bsn);
1402         if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1403                 goto err_unlock;
1404
1405         if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1406                 __skb_queue_tail(&agg->queue, skb);
1407                 agg->hsn = seq;
1408                 goto queued;
1409         }
1410
1411         skb_queue_reverse_walk(&agg->queue, iter) {
1412                 qseq = carl9170_get_seq(iter);
1413
1414                 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1415                         __skb_queue_after(&agg->queue, iter, skb);
1416                         goto queued;
1417                 }
1418         }
1419
1420         __skb_queue_head(&agg->queue, skb);
1421 queued:
1422
1423         if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1424                 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
1425                         agg->state = CARL9170_TID_STATE_XMIT;
1426                         run = true;
1427                 }
1428         }
1429
1430         spin_unlock_bh(&agg->lock);
1431         rcu_read_unlock();
1432
1433         return run;
1434
1435 err_unlock:
1436         spin_unlock_bh(&agg->lock);
1437
1438 err_unlock_rcu:
1439         rcu_read_unlock();
1440         txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;
1441         carl9170_tx_status(ar, skb, false);
1442         ar->tx_dropped++;
1443         return false;
1444 }
1445
1446 void carl9170_op_tx(struct ieee80211_hw *hw,
1447                     struct ieee80211_tx_control *control,
1448                     struct sk_buff *skb)
1449 {
1450         struct ar9170 *ar = hw->priv;
1451         struct ieee80211_tx_info *info;
1452         struct ieee80211_sta *sta = control->sta;
1453         bool run;
1454
1455         if (unlikely(!IS_STARTED(ar)))
1456                 goto err_free;
1457
1458         info = IEEE80211_SKB_CB(skb);
1459
1460         if (unlikely(carl9170_tx_prepare(ar, sta, skb)))
1461                 goto err_free;
1462
1463         carl9170_tx_accounting(ar, skb);
1464         /*
1465          * from now on, one has to use carl9170_tx_status to free
1466          * all ressouces which are associated with the frame.
1467          */
1468
1469         if (sta) {
1470                 struct carl9170_sta_info *stai = (void *) sta->drv_priv;
1471                 atomic_inc(&stai->pending_frames);
1472         }
1473
1474         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1475                 /* to static code analyzers and reviewers:
1476                  * mac80211 guarantees that a valid "sta"
1477                  * reference is present, if a frame is to
1478                  * be part of an ampdu. Hence any extra
1479                  * sta == NULL checks are redundant in this
1480                  * special case.
1481                  */
1482                 run = carl9170_tx_ampdu_queue(ar, sta, skb, info);
1483                 if (run)
1484                         carl9170_tx_ampdu(ar);
1485
1486         } else {
1487                 unsigned int queue = skb_get_queue_mapping(skb);
1488
1489                 skb_queue_tail(&ar->tx_pending[queue], skb);
1490         }
1491
1492         carl9170_tx(ar);
1493         return;
1494
1495 err_free:
1496         ar->tx_dropped++;
1497         ieee80211_free_txskb(ar->hw, skb);
1498 }
1499
1500 void carl9170_tx_scheduler(struct ar9170 *ar)
1501 {
1502
1503         if (ar->tx_ampdu_schedule)
1504                 carl9170_tx_ampdu(ar);
1505
1506         if (ar->tx_schedule)
1507                 carl9170_tx(ar);
1508 }
1509
1510 /* caller has to take rcu_read_lock */
1511 static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar)
1512 {
1513         struct carl9170_vif_info *cvif;
1514         int i = 1;
1515
1516         /* The AR9170 hardware has no fancy beacon queue or some
1517          * other scheduling mechanism. So, the driver has to make
1518          * due by setting the two beacon timers (pretbtt and tbtt)
1519          * once and then swapping the beacon address in the HW's
1520          * register file each time the pretbtt fires.
1521          */
1522
1523         cvif = rcu_dereference(ar->beacon_iter);
1524         if (ar->vifs > 0 && cvif) {
1525                 do {
1526                         list_for_each_entry_continue_rcu(cvif, &ar->vif_list,
1527                                                          list) {
1528                                 if (cvif->active && cvif->enable_beacon)
1529                                         goto out;
1530                         }
1531                 } while (ar->beacon_enabled && i--);
1532         }
1533
1534 out:
1535         rcu_assign_pointer(ar->beacon_iter, cvif);
1536         return cvif;
1537 }
1538
1539 static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb,
1540                                       u32 *ht1, u32 *plcp)
1541 {
1542         struct ieee80211_tx_info *txinfo;
1543         struct ieee80211_tx_rate *rate;
1544         unsigned int power, chains;
1545         bool ht_rate;
1546
1547         txinfo = IEEE80211_SKB_CB(skb);
1548         rate = &txinfo->control.rates[0];
1549         ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS);
1550         carl9170_tx_rate_tpc_chains(ar, txinfo, rate, plcp, &power, &chains);
1551
1552         *ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;
1553         if (chains == AR9170_TX_PHY_TXCHAIN_2)
1554                 *ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;
1555         SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7);
1556         SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power);
1557         SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains);
1558
1559         if (ht_rate) {
1560                 *ht1 |= AR9170_MAC_BCN_HT1_HT_EN;
1561                 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1562                         *plcp |= AR9170_MAC_BCN_HT2_SGI;
1563
1564                 if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
1565                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;
1566                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1567                 } else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {
1568                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;
1569                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1570                 }
1571
1572                 SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN);
1573         } else {
1574                 if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M)
1575                         *plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
1576                 else
1577                         *plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;
1578         }
1579
1580         return ht_rate;
1581 }
1582
1583 int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
1584 {
1585         struct sk_buff *skb = NULL;
1586         struct carl9170_vif_info *cvif;
1587         __le32 *data, *old = NULL;
1588         u32 word, ht1, plcp, off, addr, len;
1589         int i = 0, err = 0;
1590         bool ht_rate;
1591
1592         rcu_read_lock();
1593         cvif = carl9170_pick_beaconing_vif(ar);
1594         if (!cvif)
1595                 goto out_unlock;
1596
1597         skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
1598                 NULL, NULL);
1599
1600         if (!skb) {
1601                 err = -ENOMEM;
1602                 goto err_free;
1603         }
1604
1605         spin_lock_bh(&ar->beacon_lock);
1606         data = (__le32 *)skb->data;
1607         if (cvif->beacon)
1608                 old = (__le32 *)cvif->beacon->data;
1609
1610         off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
1611         addr = ar->fw.beacon_addr + off;
1612         len = roundup(skb->len + FCS_LEN, 4);
1613
1614         if ((off + len) > ar->fw.beacon_max_len) {
1615                 if (net_ratelimit()) {
1616                         wiphy_err(ar->hw->wiphy, "beacon does not "
1617                                   "fit into device memory!\n");
1618                 }
1619                 err = -EINVAL;
1620                 goto err_unlock;
1621         }
1622
1623         if (len > AR9170_MAC_BCN_LENGTH_MAX) {
1624                 if (net_ratelimit()) {
1625                         wiphy_err(ar->hw->wiphy, "no support for beacons "
1626                                 "bigger than %d (yours:%d).\n",
1627                                  AR9170_MAC_BCN_LENGTH_MAX, len);
1628                 }
1629
1630                 err = -EMSGSIZE;
1631                 goto err_unlock;
1632         }
1633
1634         ht_rate = carl9170_tx_beacon_physet(ar, skb, &ht1, &plcp);
1635
1636         carl9170_async_regwrite_begin(ar);
1637         carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);
1638         if (ht_rate)
1639                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);
1640         else
1641                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);
1642
1643         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
1644                 /*
1645                  * XXX: This accesses beyond skb data for up
1646                  *      to the last 3 bytes!!
1647                  */
1648
1649                 if (old && (data[i] == old[i]))
1650                         continue;
1651
1652                 word = le32_to_cpu(data[i]);
1653                 carl9170_async_regwrite(addr + 4 * i, word);
1654         }
1655         carl9170_async_regwrite_finish();
1656
1657         dev_kfree_skb_any(cvif->beacon);
1658         cvif->beacon = NULL;
1659
1660         err = carl9170_async_regwrite_result();
1661         if (!err)
1662                 cvif->beacon = skb;
1663         spin_unlock_bh(&ar->beacon_lock);
1664         if (err)
1665                 goto err_free;
1666
1667         if (submit) {
1668                 err = carl9170_bcn_ctrl(ar, cvif->id,
1669                                         CARL9170_BCN_CTRL_CAB_TRIGGER,
1670                                         addr, skb->len + FCS_LEN);
1671
1672                 if (err)
1673                         goto err_free;
1674         }
1675 out_unlock:
1676         rcu_read_unlock();
1677         return 0;
1678
1679 err_unlock:
1680         spin_unlock_bh(&ar->beacon_lock);
1681
1682 err_free:
1683         rcu_read_unlock();
1684         dev_kfree_skb_any(skb);
1685         return err;
1686 }