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

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
__carl9170_get_queue
carl9170_get_queue
is_mem_full
carl9170_tx_accounting
__carl9170_get_tx_sta
carl9170_tx_ps_unblock
carl9170_tx_accounting_free
carl9170_alloc_dev_space
carl9170_release_dev_space
carl9170_tx_release
carl9170_tx_get_skb
carl9170_tx_put_skb
carl9170_tx_shift_bm
carl9170_tx_status_process_ampdu
carl9170_tx_bar_status
carl9170_tx_status
carl9170_tx_callback
carl9170_get_queued_skb
carl9170_tx_fill_rateinfo
carl9170_check_queue_stop_timeout
carl9170_tx_ampdu_timeout
carl9170_tx_janitor
__carl9170_tx_process_status
carl9170_tx_process_status
carl9170_tx_rate_tpc_chains
carl9170_tx_physet
carl9170_tx_rts_check
carl9170_tx_cts_check
carl9170_tx_get_rates
carl9170_tx_apply_rateset
carl9170_tx_prepare
carl9170_set_immba
carl9170_set_ampdu_params
carl9170_tx_ampdu
carl9170_tx_pick_skb
carl9170_tx_drop
carl9170_tx_ps_drop
carl9170_bar_check
carl9170_tx
carl9170_tx_ampdu_queue
carl9170_op_tx
carl9170_tx_scheduler
carl9170_pick_beaconing_vif
carl9170_tx_beacon_physet
carl9170_update_beacon
   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 (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                 /* fall through */
 834 
 835         case CARL9170_ERP_MAC80211:
 836                 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
 837                         break;
 838                 /* fall through */
 839 
 840         case CARL9170_ERP_RTS:
 841                 if (likely(!multi))
 842                         return true;
 843 
 844         default:
 845                 break;
 846         }
 847 
 848         return false;
 849 }
 850 
 851 static bool carl9170_tx_cts_check(struct ar9170 *ar,
 852                                   struct ieee80211_tx_rate *rate)
 853 {
 854         switch (ar->erp_mode) {
 855         case CARL9170_ERP_AUTO:
 856         case CARL9170_ERP_MAC80211:
 857                 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 858                         break;
 859                 /* fall through */
 860 
 861         case CARL9170_ERP_CTS:
 862                 return true;
 863 
 864         default:
 865                 break;
 866         }
 867 
 868         return false;
 869 }
 870 
 871 static void carl9170_tx_get_rates(struct ar9170 *ar,
 872                                   struct ieee80211_vif *vif,
 873                                   struct ieee80211_sta *sta,
 874                                   struct sk_buff *skb)
 875 {
 876         struct ieee80211_tx_info *info;
 877 
 878         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
 879         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES > IEEE80211_TX_RATE_TABLE_SIZE);
 880 
 881         info = IEEE80211_SKB_CB(skb);
 882 
 883         ieee80211_get_tx_rates(vif, sta, skb,
 884                                info->control.rates,
 885                                IEEE80211_TX_MAX_RATES);
 886 }
 887 
 888 static void carl9170_tx_apply_rateset(struct ar9170 *ar,
 889                                       struct ieee80211_tx_info *sinfo,
 890                                       struct sk_buff *skb)
 891 {
 892         struct ieee80211_tx_rate *txrate;
 893         struct ieee80211_tx_info *info;
 894         struct _carl9170_tx_superframe *txc = (void *) skb->data;
 895         int i;
 896         bool ampdu;
 897         bool no_ack;
 898 
 899         info = IEEE80211_SKB_CB(skb);
 900         ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
 901         no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
 902 
 903         /* Set the rate control probe flag for all (sub-) frames.
 904          * This is because the TX_STATS_AMPDU flag is only set on
 905          * the last frame, so it has to be inherited.
 906          */
 907         info->flags |= (sinfo->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
 908 
 909         /* NOTE: For the first rate, the ERP & AMPDU flags are directly
 910          * taken from mac_control. For all fallback rate, the firmware
 911          * updates the mac_control flags from the rate info field.
 912          */
 913         for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
 914                 __le32 phy_set;
 915 
 916                 txrate = &sinfo->control.rates[i];
 917                 if (txrate->idx < 0)
 918                         break;
 919 
 920                 phy_set = carl9170_tx_physet(ar, info, txrate);
 921                 if (i == 0) {
 922                         __le16 mac_tmp = cpu_to_le16(0);
 923 
 924                         /* first rate - part of the hw's frame header */
 925                         txc->f.phy_control = phy_set;
 926 
 927                         if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)
 928                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
 929 
 930                         if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 931                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
 932                         else if (carl9170_tx_cts_check(ar, txrate))
 933                                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
 934 
 935                         txc->f.mac_control |= mac_tmp;
 936                 } else {
 937                         /* fallback rates are stored in the firmware's
 938                          * retry rate set array.
 939                          */
 940                         txc->s.rr[i - 1] = phy_set;
 941                 }
 942 
 943                 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
 944                         txrate->count);
 945 
 946                 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
 947                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
 948                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 949                 else if (carl9170_tx_cts_check(ar, txrate))
 950                         txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
 951                                 CARL9170_TX_SUPER_RI_ERP_PROT_S);
 952 
 953                 if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))
 954                         txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;
 955         }
 956 }
 957 
 958 static int carl9170_tx_prepare(struct ar9170 *ar,
 959                                struct ieee80211_sta *sta,
 960                                struct sk_buff *skb)
 961 {
 962         struct ieee80211_hdr *hdr;
 963         struct _carl9170_tx_superframe *txc;
 964         struct carl9170_vif_info *cvif;
 965         struct ieee80211_tx_info *info;
 966         struct carl9170_tx_info *arinfo;
 967         unsigned int hw_queue;
 968         __le16 mac_tmp;
 969         u16 len;
 970 
 971         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
 972         BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
 973                      CARL9170_TX_SUPERDESC_LEN);
 974 
 975         BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
 976                      AR9170_TX_HWDESC_LEN);
 977 
 978         BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
 979                 ((CARL9170_TX_SUPER_MISC_VIF_ID >>
 980                  CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
 981 
 982         hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
 983 
 984         hdr = (void *)skb->data;
 985         info = IEEE80211_SKB_CB(skb);
 986         len = skb->len;
 987 
 988         /*
 989          * Note: If the frame was sent through a monitor interface,
 990          * the ieee80211_vif pointer can be NULL.
 991          */
 992         if (likely(info->control.vif))
 993                 cvif = (void *) info->control.vif->drv_priv;
 994         else
 995                 cvif = NULL;
 996 
 997         txc = skb_push(skb, sizeof(*txc));
 998         memset(txc, 0, sizeof(*txc));
 999 
1000         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
1001 
1002         if (likely(cvif))
1003                 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
1004 
1005         if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
1006                 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
1007 
1008         if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
1009                 txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;
1010 
1011         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
1012                 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
1013 
1014         mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
1015                               AR9170_TX_MAC_BACKOFF);
1016         mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
1017                                AR9170_TX_MAC_QOS);
1018 
1019         if (unlikely(info->flags & IEEE80211_TX_CTL_NO_ACK))
1020                 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
1021 
1022         if (info->control.hw_key) {
1023                 len += info->control.hw_key->icv_len;
1024 
1025                 switch (info->control.hw_key->cipher) {
1026                 case WLAN_CIPHER_SUITE_WEP40:
1027                 case WLAN_CIPHER_SUITE_WEP104:
1028                 case WLAN_CIPHER_SUITE_TKIP:
1029                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
1030                         break;
1031                 case WLAN_CIPHER_SUITE_CCMP:
1032                         mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
1033                         break;
1034                 default:
1035                         WARN_ON(1);
1036                         goto err_out;
1037                 }
1038         }
1039 
1040         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1041                 unsigned int density, factor;
1042 
1043                 if (unlikely(!sta || !cvif))
1044                         goto err_out;
1045 
1046                 factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor);
1047                 density = sta->ht_cap.ampdu_density;
1048 
1049                 if (density) {
1050                         /*
1051                          * Watch out!
1052                          *
1053                          * Otus uses slightly different density values than
1054                          * those from the 802.11n spec.
1055                          */
1056 
1057                         density = max_t(unsigned int, density + 1, 7u);
1058                 }
1059 
1060                 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
1061                         txc->s.ampdu_settings, density);
1062 
1063                 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
1064                         txc->s.ampdu_settings, factor);
1065         }
1066 
1067         txc->s.len = cpu_to_le16(skb->len);
1068         txc->f.length = cpu_to_le16(len + FCS_LEN);
1069         txc->f.mac_control = mac_tmp;
1070 
1071         arinfo = (void *)info->rate_driver_data;
1072         arinfo->timeout = jiffies;
1073         arinfo->ar = ar;
1074         kref_init(&arinfo->ref);
1075         return 0;
1076 
1077 err_out:
1078         skb_pull(skb, sizeof(*txc));
1079         return -EINVAL;
1080 }
1081 
1082 static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
1083 {
1084         struct _carl9170_tx_superframe *super;
1085 
1086         super = (void *) skb->data;
1087         super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1088 }
1089 
1090 static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1091 {
1092         struct _carl9170_tx_superframe *super;
1093         int tmp;
1094 
1095         super = (void *) skb->data;
1096 
1097         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1098                 CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1099 
1100         /*
1101          * If you haven't noticed carl9170_tx_prepare has already filled
1102          * in all ampdu spacing & factor parameters.
1103          * Now it's the time to check whenever the settings have to be
1104          * updated by the firmware, or if everything is still the same.
1105          *
1106          * There's no sane way to handle different density values with
1107          * this hardware, so we may as well just do the compare in the
1108          * driver.
1109          */
1110 
1111         if (tmp != ar->current_density) {
1112                 ar->current_density = tmp;
1113                 super->s.ampdu_settings |=
1114                         CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1115         }
1116 
1117         tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1118                 CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1119 
1120         if (tmp != ar->current_factor) {
1121                 ar->current_factor = tmp;
1122                 super->s.ampdu_settings |=
1123                         CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1124         }
1125 }
1126 
1127 static void carl9170_tx_ampdu(struct ar9170 *ar)
1128 {
1129         struct sk_buff_head agg;
1130         struct carl9170_sta_tid *tid_info;
1131         struct sk_buff *skb, *first;
1132         struct ieee80211_tx_info *tx_info_first;
1133         unsigned int i = 0, done_ampdus = 0;
1134         u16 seq, queue, tmpssn;
1135 
1136         atomic_inc(&ar->tx_ampdu_scheduler);
1137         ar->tx_ampdu_schedule = false;
1138 
1139         if (atomic_read(&ar->tx_ampdu_upload))
1140                 return;
1141 
1142         if (!ar->tx_ampdu_list_len)
1143                 return;
1144 
1145         __skb_queue_head_init(&agg);
1146 
1147         rcu_read_lock();
1148         tid_info = rcu_dereference(ar->tx_ampdu_iter);
1149         if (WARN_ON_ONCE(!tid_info)) {
1150                 rcu_read_unlock();
1151                 return;
1152         }
1153 
1154 retry:
1155         list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1156                 i++;
1157 
1158                 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1159                         continue;
1160 
1161                 queue = TID_TO_WME_AC(tid_info->tid);
1162 
1163                 spin_lock_bh(&tid_info->lock);
1164                 if (tid_info->state != CARL9170_TID_STATE_XMIT)
1165                         goto processed;
1166 
1167                 tid_info->counter++;
1168                 first = skb_peek(&tid_info->queue);
1169                 tmpssn = carl9170_get_seq(first);
1170                 seq = tid_info->snx;
1171 
1172                 if (unlikely(tmpssn != seq)) {
1173                         tid_info->state = CARL9170_TID_STATE_IDLE;
1174 
1175                         goto processed;
1176                 }
1177 
1178                 tx_info_first = NULL;
1179                 while ((skb = skb_peek(&tid_info->queue))) {
1180                         /* strict 0, 1, ..., n - 1, n frame sequence order */
1181                         if (unlikely(carl9170_get_seq(skb) != seq))
1182                                 break;
1183 
1184                         /* don't upload more than AMPDU FACTOR allows. */
1185                         if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1186                             (tid_info->max - 1)))
1187                                 break;
1188 
1189                         if (!tx_info_first) {
1190                                 carl9170_tx_get_rates(ar, tid_info->vif,
1191                                                       tid_info->sta, first);
1192                                 tx_info_first = IEEE80211_SKB_CB(first);
1193                         }
1194 
1195                         carl9170_tx_apply_rateset(ar, tx_info_first, skb);
1196 
1197                         atomic_inc(&ar->tx_ampdu_upload);
1198                         tid_info->snx = seq = SEQ_NEXT(seq);
1199                         __skb_unlink(skb, &tid_info->queue);
1200 
1201                         __skb_queue_tail(&agg, skb);
1202 
1203                         if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
1204                                 break;
1205                 }
1206 
1207                 if (skb_queue_empty(&tid_info->queue) ||
1208                     carl9170_get_seq(skb_peek(&tid_info->queue)) !=
1209                     tid_info->snx) {
1210                         /* stop TID, if A-MPDU frames are still missing,
1211                          * or whenever the queue is empty.
1212                          */
1213 
1214                         tid_info->state = CARL9170_TID_STATE_IDLE;
1215                 }
1216                 done_ampdus++;
1217 
1218 processed:
1219                 spin_unlock_bh(&tid_info->lock);
1220 
1221                 if (skb_queue_empty(&agg))
1222                         continue;
1223 
1224                 /* apply ampdu spacing & factor settings */
1225                 carl9170_set_ampdu_params(ar, skb_peek(&agg));
1226 
1227                 /* set aggregation push bit */
1228                 carl9170_set_immba(ar, skb_peek_tail(&agg));
1229 
1230                 spin_lock_bh(&ar->tx_pending[queue].lock);
1231                 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
1232                 spin_unlock_bh(&ar->tx_pending[queue].lock);
1233                 ar->tx_schedule = true;
1234         }
1235         if ((done_ampdus++ == 0) && (i++ == 0))
1236                 goto retry;
1237 
1238         rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1239         rcu_read_unlock();
1240 }
1241 
1242 static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1243                                             struct sk_buff_head *queue)
1244 {
1245         struct sk_buff *skb;
1246         struct ieee80211_tx_info *info;
1247         struct carl9170_tx_info *arinfo;
1248 
1249         BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1250 
1251         spin_lock_bh(&queue->lock);
1252         skb = skb_peek(queue);
1253         if (unlikely(!skb))
1254                 goto err_unlock;
1255 
1256         if (carl9170_alloc_dev_space(ar, skb))
1257                 goto err_unlock;
1258 
1259         __skb_unlink(skb, queue);
1260         spin_unlock_bh(&queue->lock);
1261 
1262         info = IEEE80211_SKB_CB(skb);
1263         arinfo = (void *) info->rate_driver_data;
1264 
1265         arinfo->timeout = jiffies;
1266         return skb;
1267 
1268 err_unlock:
1269         spin_unlock_bh(&queue->lock);
1270         return NULL;
1271 }
1272 
1273 void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1274 {
1275         struct _carl9170_tx_superframe *super;
1276         uint8_t q = 0;
1277 
1278         ar->tx_dropped++;
1279 
1280         super = (void *)skb->data;
1281         SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1282                 ar9170_qmap[carl9170_get_queue(ar, skb)]);
1283         __carl9170_tx_process_status(ar, super->s.cookie, q);
1284 }
1285 
1286 static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
1287 {
1288         struct ieee80211_sta *sta;
1289         struct carl9170_sta_info *sta_info;
1290         struct ieee80211_tx_info *tx_info;
1291 
1292         rcu_read_lock();
1293         sta = __carl9170_get_tx_sta(ar, skb);
1294         if (!sta)
1295                 goto out_rcu;
1296 
1297         sta_info = (void *) sta->drv_priv;
1298         tx_info = IEEE80211_SKB_CB(skb);
1299 
1300         if (unlikely(sta_info->sleeping) &&
1301             !(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
1302                                 IEEE80211_TX_CTL_CLEAR_PS_FILT))) {
1303                 rcu_read_unlock();
1304 
1305                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
1306                         atomic_dec(&ar->tx_ampdu_upload);
1307 
1308                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1309                 carl9170_release_dev_space(ar, skb);
1310                 carl9170_tx_status(ar, skb, false);
1311                 return true;
1312         }
1313 
1314 out_rcu:
1315         rcu_read_unlock();
1316         return false;
1317 }
1318 
1319 static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb)
1320 {
1321         struct _carl9170_tx_superframe *super = (void *) skb->data;
1322         struct ieee80211_bar *bar = (void *) super->frame_data;
1323 
1324         if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
1325             skb->len >= sizeof(struct ieee80211_bar)) {
1326                 struct carl9170_bar_list_entry *entry;
1327                 unsigned int queue = skb_get_queue_mapping(skb);
1328 
1329                 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1330                 if (!WARN_ON_ONCE(!entry)) {
1331                         entry->skb = skb;
1332                         spin_lock_bh(&ar->bar_list_lock[queue]);
1333                         list_add_tail_rcu(&entry->list, &ar->bar_list[queue]);
1334                         spin_unlock_bh(&ar->bar_list_lock[queue]);
1335                 }
1336         }
1337 }
1338 
1339 static void carl9170_tx(struct ar9170 *ar)
1340 {
1341         struct sk_buff *skb;
1342         unsigned int i, q;
1343         bool schedule_garbagecollector = false;
1344 
1345         ar->tx_schedule = false;
1346 
1347         if (unlikely(!IS_STARTED(ar)))
1348                 return;
1349 
1350         carl9170_usb_handle_tx_err(ar);
1351 
1352         for (i = 0; i < ar->hw->queues; i++) {
1353                 while (!skb_queue_empty(&ar->tx_pending[i])) {
1354                         skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
1355                         if (unlikely(!skb))
1356                                 break;
1357 
1358                         if (unlikely(carl9170_tx_ps_drop(ar, skb)))
1359                                 continue;
1360 
1361                         carl9170_bar_check(ar, skb);
1362 
1363                         atomic_inc(&ar->tx_total_pending);
1364 
1365                         q = __carl9170_get_queue(ar, i);
1366                         /*
1367                          * NB: tx_status[i] vs. tx_status[q],
1368                          * TODO: Move into pick_skb or alloc_dev_space.
1369                          */
1370                         skb_queue_tail(&ar->tx_status[q], skb);
1371 
1372                         /*
1373                          * increase ref count to "2".
1374                          * Ref counting is the easiest way to solve the
1375                          * race between the urb's completion routine:
1376                          *      carl9170_tx_callback
1377                          * and wlan tx status functions:
1378                          *      carl9170_tx_status/janitor.
1379                          */
1380                         carl9170_tx_get_skb(skb);
1381 
1382                         carl9170_usb_tx(ar, skb);
1383                         schedule_garbagecollector = true;
1384                 }
1385         }
1386 
1387         if (!schedule_garbagecollector)
1388                 return;
1389 
1390         ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
1391                 msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1392 }
1393 
1394 static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1395         struct ieee80211_sta *sta, struct sk_buff *skb,
1396         struct ieee80211_tx_info *txinfo)
1397 {
1398         struct carl9170_sta_info *sta_info;
1399         struct carl9170_sta_tid *agg;
1400         struct sk_buff *iter;
1401         u16 tid, seq, qseq, off;
1402         bool run = false;
1403 
1404         tid = carl9170_get_tid(skb);
1405         seq = carl9170_get_seq(skb);
1406         sta_info = (void *) sta->drv_priv;
1407 
1408         rcu_read_lock();
1409         agg = rcu_dereference(sta_info->agg[tid]);
1410 
1411         if (!agg)
1412                 goto err_unlock_rcu;
1413 
1414         spin_lock_bh(&agg->lock);
1415         if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1416                 goto err_unlock;
1417 
1418         /* check if sequence is within the BA window */
1419         if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1420                 goto err_unlock;
1421 
1422         if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1423                 goto err_unlock;
1424 
1425         off = SEQ_DIFF(seq, agg->bsn);
1426         if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1427                 goto err_unlock;
1428 
1429         if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1430                 __skb_queue_tail(&agg->queue, skb);
1431                 agg->hsn = seq;
1432                 goto queued;
1433         }
1434 
1435         skb_queue_reverse_walk(&agg->queue, iter) {
1436                 qseq = carl9170_get_seq(iter);
1437 
1438                 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1439                         __skb_queue_after(&agg->queue, iter, skb);
1440                         goto queued;
1441                 }
1442         }
1443 
1444         __skb_queue_head(&agg->queue, skb);
1445 queued:
1446 
1447         if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1448                 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
1449                         agg->state = CARL9170_TID_STATE_XMIT;
1450                         run = true;
1451                 }
1452         }
1453 
1454         spin_unlock_bh(&agg->lock);
1455         rcu_read_unlock();
1456 
1457         return run;
1458 
1459 err_unlock:
1460         spin_unlock_bh(&agg->lock);
1461 
1462 err_unlock_rcu:
1463         rcu_read_unlock();
1464         txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;
1465         carl9170_tx_status(ar, skb, false);
1466         ar->tx_dropped++;
1467         return false;
1468 }
1469 
1470 void carl9170_op_tx(struct ieee80211_hw *hw,
1471                     struct ieee80211_tx_control *control,
1472                     struct sk_buff *skb)
1473 {
1474         struct ar9170 *ar = hw->priv;
1475         struct ieee80211_tx_info *info;
1476         struct ieee80211_sta *sta = control->sta;
1477         struct ieee80211_vif *vif;
1478         bool run;
1479 
1480         if (unlikely(!IS_STARTED(ar)))
1481                 goto err_free;
1482 
1483         info = IEEE80211_SKB_CB(skb);
1484         vif = info->control.vif;
1485 
1486         if (unlikely(carl9170_tx_prepare(ar, sta, skb)))
1487                 goto err_free;
1488 
1489         carl9170_tx_accounting(ar, skb);
1490         /*
1491          * from now on, one has to use carl9170_tx_status to free
1492          * all ressouces which are associated with the frame.
1493          */
1494 
1495         if (sta) {
1496                 struct carl9170_sta_info *stai = (void *) sta->drv_priv;
1497                 atomic_inc(&stai->pending_frames);
1498         }
1499 
1500         if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1501                 /* to static code analyzers and reviewers:
1502                  * mac80211 guarantees that a valid "sta"
1503                  * reference is present, if a frame is to
1504                  * be part of an ampdu. Hence any extra
1505                  * sta == NULL checks are redundant in this
1506                  * special case.
1507                  */
1508                 run = carl9170_tx_ampdu_queue(ar, sta, skb, info);
1509                 if (run)
1510                         carl9170_tx_ampdu(ar);
1511 
1512         } else {
1513                 unsigned int queue = skb_get_queue_mapping(skb);
1514 
1515                 carl9170_tx_get_rates(ar, vif, sta, skb);
1516                 carl9170_tx_apply_rateset(ar, info, skb);
1517                 skb_queue_tail(&ar->tx_pending[queue], skb);
1518         }
1519 
1520         carl9170_tx(ar);
1521         return;
1522 
1523 err_free:
1524         ar->tx_dropped++;
1525         ieee80211_free_txskb(ar->hw, skb);
1526 }
1527 
1528 void carl9170_tx_scheduler(struct ar9170 *ar)
1529 {
1530 
1531         if (ar->tx_ampdu_schedule)
1532                 carl9170_tx_ampdu(ar);
1533 
1534         if (ar->tx_schedule)
1535                 carl9170_tx(ar);
1536 }
1537 
1538 /* caller has to take rcu_read_lock */
1539 static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar)
1540 {
1541         struct carl9170_vif_info *cvif;
1542         int i = 1;
1543 
1544         /* The AR9170 hardware has no fancy beacon queue or some
1545          * other scheduling mechanism. So, the driver has to make
1546          * due by setting the two beacon timers (pretbtt and tbtt)
1547          * once and then swapping the beacon address in the HW's
1548          * register file each time the pretbtt fires.
1549          */
1550 
1551         cvif = rcu_dereference(ar->beacon_iter);
1552         if (ar->vifs > 0 && cvif) {
1553                 do {
1554                         list_for_each_entry_continue_rcu(cvif, &ar->vif_list,
1555                                                          list) {
1556                                 if (cvif->active && cvif->enable_beacon)
1557                                         goto out;
1558                         }
1559                 } while (ar->beacon_enabled && i--);
1560         }
1561 
1562 out:
1563         RCU_INIT_POINTER(ar->beacon_iter, cvif);
1564         return cvif;
1565 }
1566 
1567 static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb,
1568                                       u32 *ht1, u32 *plcp)
1569 {
1570         struct ieee80211_tx_info *txinfo;
1571         struct ieee80211_tx_rate *rate;
1572         unsigned int power, chains;
1573         bool ht_rate;
1574 
1575         txinfo = IEEE80211_SKB_CB(skb);
1576         rate = &txinfo->control.rates[0];
1577         ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS);
1578         carl9170_tx_rate_tpc_chains(ar, txinfo, rate, plcp, &power, &chains);
1579 
1580         *ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;
1581         if (chains == AR9170_TX_PHY_TXCHAIN_2)
1582                 *ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;
1583         SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7);
1584         SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power);
1585         SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains);
1586 
1587         if (ht_rate) {
1588                 *ht1 |= AR9170_MAC_BCN_HT1_HT_EN;
1589                 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1590                         *plcp |= AR9170_MAC_BCN_HT2_SGI;
1591 
1592                 if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
1593                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;
1594                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1595                 } else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {
1596                         *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;
1597                         *plcp |= AR9170_MAC_BCN_HT2_BW40;
1598                 }
1599 
1600                 SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN);
1601         } else {
1602                 if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M)
1603                         *plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
1604                 else
1605                         *plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;
1606         }
1607 
1608         return ht_rate;
1609 }
1610 
1611 int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
1612 {
1613         struct sk_buff *skb = NULL;
1614         struct carl9170_vif_info *cvif;
1615         __le32 *data, *old = NULL;
1616         u32 word, ht1, plcp, off, addr, len;
1617         int i = 0, err = 0;
1618         bool ht_rate;
1619 
1620         rcu_read_lock();
1621         cvif = carl9170_pick_beaconing_vif(ar);
1622         if (!cvif)
1623                 goto out_unlock;
1624 
1625         skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
1626                 NULL, NULL);
1627 
1628         if (!skb) {
1629                 err = -ENOMEM;
1630                 goto err_free;
1631         }
1632 
1633         spin_lock_bh(&ar->beacon_lock);
1634         data = (__le32 *)skb->data;
1635         if (cvif->beacon)
1636                 old = (__le32 *)cvif->beacon->data;
1637 
1638         off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
1639         addr = ar->fw.beacon_addr + off;
1640         len = roundup(skb->len + FCS_LEN, 4);
1641 
1642         if ((off + len) > ar->fw.beacon_max_len) {
1643                 if (net_ratelimit()) {
1644                         wiphy_err(ar->hw->wiphy, "beacon does not "
1645                                   "fit into device memory!\n");
1646                 }
1647                 err = -EINVAL;
1648                 goto err_unlock;
1649         }
1650 
1651         if (len > AR9170_MAC_BCN_LENGTH_MAX) {
1652                 if (net_ratelimit()) {
1653                         wiphy_err(ar->hw->wiphy, "no support for beacons "
1654                                 "bigger than %d (yours:%d).\n",
1655                                  AR9170_MAC_BCN_LENGTH_MAX, len);
1656                 }
1657 
1658                 err = -EMSGSIZE;
1659                 goto err_unlock;
1660         }
1661 
1662         ht_rate = carl9170_tx_beacon_physet(ar, skb, &ht1, &plcp);
1663 
1664         carl9170_async_regwrite_begin(ar);
1665         carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);
1666         if (ht_rate)
1667                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);
1668         else
1669                 carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);
1670 
1671         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
1672                 /*
1673                  * XXX: This accesses beyond skb data for up
1674                  *      to the last 3 bytes!!
1675                  */
1676 
1677                 if (old && (data[i] == old[i]))
1678                         continue;
1679 
1680                 word = le32_to_cpu(data[i]);
1681                 carl9170_async_regwrite(addr + 4 * i, word);
1682         }
1683         carl9170_async_regwrite_finish();
1684 
1685         dev_kfree_skb_any(cvif->beacon);
1686         cvif->beacon = NULL;
1687 
1688         err = carl9170_async_regwrite_result();
1689         if (!err)
1690                 cvif->beacon = skb;
1691         spin_unlock_bh(&ar->beacon_lock);
1692         if (err)
1693                 goto err_free;
1694 
1695         if (submit) {
1696                 err = carl9170_bcn_ctrl(ar, cvif->id,
1697                                         CARL9170_BCN_CTRL_CAB_TRIGGER,
1698                                         addr, skb->len + FCS_LEN);
1699 
1700                 if (err)
1701                         goto err_free;
1702         }
1703 out_unlock:
1704         rcu_read_unlock();
1705         return 0;
1706 
1707 err_unlock:
1708         spin_unlock_bh(&ar->beacon_lock);
1709 
1710 err_free:
1711         rcu_read_unlock();
1712         dev_kfree_skb_any(skb);
1713         return err;
1714 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/ath/carl9170/tx.c

DEFINITIONS
