Pileus Git - ~andy/linux/blob - net/mac80211/status.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/export.h>
  13 #include <linux/etherdevice.h>
  14 #include <net/mac80211.h>
  15 #include <asm/unaligned.h>
  16 #include "ieee80211_i.h"
  17 #include "rate.h"
  18 #include "mesh.h"
  19 #include "led.h"
  20 #include "wme.h"
  21
  22
  23 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  24                                  struct sk_buff *skb)
  25 {
  26         struct ieee80211_local *local = hw_to_local(hw);
  27         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  28         int tmp;
  29
  30         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  31         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  32                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  33         tmp = skb_queue_len(&local->skb_queue) +
  34                 skb_queue_len(&local->skb_queue_unreliable);
  35         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  36                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  37                 ieee80211_free_txskb(hw, skb);
  38                 tmp--;
  39                 I802_DEBUG_INC(local->tx_status_drop);
  40         }
  41         tasklet_schedule(&local->tasklet);
  42 }
  43 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  44
  45 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  46                                             struct sta_info *sta,
  47                                             struct sk_buff *skb)
  48 {
  49         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  50         struct ieee80211_hdr *hdr = (void *)skb->data;
  51         int ac;
  52
  53         /*
  54          * This skb 'survived' a round-trip through the driver, and
  55          * hopefully the driver didn't mangle it too badly. However,
  56          * we can definitely not rely on the control information
  57          * being correct. Clear it so we don't get junk there, and
  58          * indicate that it needs new processing, but must not be
  59          * modified/encrypted again.
  60          */
  61         memset(&info->control, 0, sizeof(info->control));
  62
  63         info->control.jiffies = jiffies;
  64         info->control.vif = &sta->sdata->vif;
  65         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  66                        IEEE80211_TX_INTFL_RETRANSMISSION;
  67         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  68
  69         sta->tx_filtered_count++;
  70
  71         /*
  72          * Clear more-data bit on filtered frames, it might be set
  73          * but later frames might time out so it might have to be
  74          * clear again ... It's all rather unlikely (this frame
  75          * should time out first, right?) but let's not confuse
  76          * peers unnecessarily.
  77          */
  78         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  79                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  80
  81         if (ieee80211_is_data_qos(hdr->frame_control)) {
  82                 u8 *p = ieee80211_get_qos_ctl(hdr);
  83                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  84
  85                 /*
  86                  * Clear EOSP if set, this could happen e.g.
  87                  * if an absence period (us being a P2P GO)
  88                  * shortens the SP.
  89                  */
  90                 if (*p & IEEE80211_QOS_CTL_EOSP)
  91                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  92                 ac = ieee802_1d_to_ac[tid & 7];
  93         } else {
  94                 ac = IEEE80211_AC_BE;
  95         }
  96
  97         /*
  98          * Clear the TX filter mask for this STA when sending the next
  99          * packet. If the STA went to power save mode, this will happen
 100          * when it wakes up for the next time.
 101          */
 102         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 103
 104         /*
 105          * This code races in the following way:
 106          *
 107          *  (1) STA sends frame indicating it will go to sleep and does so
 108          *  (2) hardware/firmware adds STA to filter list, passes frame up
 109          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 110          *  (4) we get TX status before having processed the frame and
 111          *      knowing that the STA has gone to sleep.
 112          *
 113          * This is actually quite unlikely even when both those events are
 114          * processed from interrupts coming in quickly after one another or
 115          * even at the same time because we queue both TX status events and
 116          * RX frames to be processed by a tasklet and process them in the
 117          * same order that they were received or TX status last. Hence, there
 118          * is no race as long as the frame RX is processed before the next TX
 119          * status, which drivers can ensure, see below.
 120          *
 121          * Note that this can only happen if the hardware or firmware can
 122          * actually add STAs to the filter list, if this is done by the
 123          * driver in response to set_tim() (which will only reduce the race
 124          * this whole filtering tries to solve, not completely solve it)
 125          * this situation cannot happen.
 126          *
 127          * To completely solve this race drivers need to make sure that they
 128          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 129          *      functions and
 130          *  (b) always process RX events before TX status events if ordering
 131          *      can be unknown, for example with different interrupt status
 132          *      bits.
 133          *  (c) if PS mode transitions are manual (i.e. the flag
 134          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 135          *      changes before calling TX status events if ordering can be
 136          *      unknown.
 137          */
 138         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 139             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 140                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 141                 sta_info_recalc_tim(sta);
 142
 143                 if (!timer_pending(&local->sta_cleanup))
 144                         mod_timer(&local->sta_cleanup,
 145                                   round_jiffies(jiffies +
 146                                                 STA_INFO_CLEANUP_INTERVAL));
 147                 return;
 148         }
 149
 150         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 151             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 152                 /* Software retry the packet once */
 153                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 154                 ieee80211_add_pending_skb(local, skb);
 155                 return;
 156         }
 157
 158         ps_dbg_ratelimited(sta->sdata,
 159                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 160                            skb_queue_len(&sta->tx_filtered[ac]),
 161                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 162         ieee80211_free_txskb(&local->hw, skb);
 163 }
 164
 165 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 166 {
 167         struct tid_ampdu_tx *tid_tx;
 168
 169         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 170         if (!tid_tx || !tid_tx->bar_pending)
 171                 return;
 172
 173         tid_tx->bar_pending = false;
 174         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 175 }
 176
 177 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 178 {
 179         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 180         struct ieee80211_local *local = sta->local;
 181         struct ieee80211_sub_if_data *sdata = sta->sdata;
 182
 183         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 184                 struct ieee80211_hdr *hdr = (void *) skb->data;
 185                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 186                 u16 tid = qc[0] & 0xf;
 187
 188                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 189         }
 190
 191         if (ieee80211_is_action(mgmt->frame_control) &&
 192             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 193             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 194             sdata->vif.type == NL80211_IFTYPE_STATION &&
 195             ieee80211_sdata_running(sdata)) {
 196                 /*
 197                  * This update looks racy, but isn't -- if we come
 198                  * here we've definitely got a station that we're
 199                  * talking to, and on a managed interface that can
 200                  * only be the AP. And the only other place updating
 201                  * this variable in managed mode is before association.
 202                  */
 203                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 204                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 205                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
 206                         break;
 207                 case WLAN_HT_SMPS_CONTROL_STATIC:
 208                         sdata->smps_mode = IEEE80211_SMPS_STATIC;
 209                         break;
 210                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 211                 default: /* shouldn't happen since we don't send that */
 212                         sdata->smps_mode = IEEE80211_SMPS_OFF;
 213                         break;
 214                 }
 215
 216                 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 217         }
 218 }
 219
 220 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 221 {
 222         struct tid_ampdu_tx *tid_tx;
 223
 224         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 225         if (!tid_tx)
 226                 return;
 227
 228         tid_tx->failed_bar_ssn = ssn;
 229         tid_tx->bar_pending = true;
 230 }
 231
 232 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
 233 {
 234         int len = sizeof(struct ieee80211_radiotap_header);
 235
 236         /* IEEE80211_RADIOTAP_RATE rate */
 237         if (info->status.rates[0].idx >= 0 &&
 238             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 239                 len += 2;
 240
 241         /* IEEE80211_RADIOTAP_TX_FLAGS */
 242         len += 2;
 243
 244         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 245         len += 1;
 246
 247         /* IEEE80211_TX_RC_MCS */
 248         if (info->status.rates[0].idx >= 0 &&
 249             info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 250                 len += 3;
 251
 252         return len;
 253 }
 254
 255 static void
 256 ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band *sband,
 257                                  struct sk_buff *skb, int retry_count,
 258                                  int rtap_len, int shift)
 259 {
 260         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 261         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 262         struct ieee80211_radiotap_header *rthdr;
 263         unsigned char *pos;
 264         u16 txflags;
 265
 266         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
 267
 268         memset(rthdr, 0, rtap_len);
 269         rthdr->it_len = cpu_to_le16(rtap_len);
 270         rthdr->it_present =
 271                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 272                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 273         pos = (unsigned char *)(rthdr + 1);
 274
 275         /*
 276          * XXX: Once radiotap gets the bitmap reset thing the vendor
 277          *      extensions proposal contains, we can actually report
 278          *      the whole set of tries we did.
 279          */
 280
 281         /* IEEE80211_RADIOTAP_RATE */
 282         if (info->status.rates[0].idx >= 0 &&
 283             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
 284                 u16 rate;
 285
 286                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 287                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
 288                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
 289                 /* padding for tx flags */
 290                 pos += 2;
 291         }
 292
 293         /* IEEE80211_RADIOTAP_TX_FLAGS */
 294         txflags = 0;
 295         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 296             !is_multicast_ether_addr(hdr->addr1))
 297                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 298
 299         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 300             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 301                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 302         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 303                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 304
 305         put_unaligned_le16(txflags, pos);
 306         pos += 2;
 307
 308         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 309         /* for now report the total retry_count */
 310         *pos = retry_count;
 311         pos++;
 312
 313         /* IEEE80211_TX_RC_MCS */
 314         if (info->status.rates[0].idx >= 0 &&
 315             info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 316                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 317                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 318                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 319                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 320                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 321                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 322                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 323                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 324                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 325                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 326                 pos[2] = info->status.rates[0].idx;
 327                 pos += 3;
 328         }
 329
 330 }
 331
 332 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 333                                       struct sk_buff *skb, bool dropped)
 334 {
 335         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 336         struct ieee80211_hdr *hdr = (void *)skb->data;
 337         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 338
 339         if (dropped)
 340                 acked = false;
 341
 342         if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
 343                            IEEE80211_TX_INTFL_MLME_CONN_TX)) {
 344                 struct ieee80211_sub_if_data *sdata = NULL;
 345                 struct ieee80211_sub_if_data *iter_sdata;
 346                 u64 cookie = (unsigned long)skb;
 347
 348                 rcu_read_lock();
 349
 350                 if (skb->dev) {
 351                         list_for_each_entry_rcu(iter_sdata, &local->interfaces,
 352                                                 list) {
 353                                 if (!iter_sdata->dev)
 354                                         continue;
 355
 356                                 if (skb->dev == iter_sdata->dev) {
 357                                         sdata = iter_sdata;
 358                                         break;
 359                                 }
 360                         }
 361                 } else {
 362                         sdata = rcu_dereference(local->p2p_sdata);
 363                 }
 364
 365                 if (!sdata) {
 366                         skb->dev = NULL;
 367                 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 368                         ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control,
 369                                                      acked);
 370                 } else if (ieee80211_is_nullfunc(hdr->frame_control) ||
 371                            ieee80211_is_qos_nullfunc(hdr->frame_control)) {
 372                         cfg80211_probe_status(sdata->dev, hdr->addr1,
 373                                               cookie, acked, GFP_ATOMIC);
 374                 } else {
 375                         cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data,
 376                                                 skb->len, acked, GFP_ATOMIC);
 377                 }
 378
 379                 rcu_read_unlock();
 380         }
 381
 382         if (unlikely(info->ack_frame_id)) {
 383                 struct sk_buff *ack_skb;
 384                 unsigned long flags;
 385
 386                 spin_lock_irqsave(&local->ack_status_lock, flags);
 387                 ack_skb = idr_find(&local->ack_status_frames,
 388                                    info->ack_frame_id);
 389                 if (ack_skb)
 390                         idr_remove(&local->ack_status_frames,
 391                                    info->ack_frame_id);
 392                 spin_unlock_irqrestore(&local->ack_status_lock, flags);
 393
 394                 if (ack_skb) {
 395                         if (!dropped) {
 396                                 /* consumes ack_skb */
 397                                 skb_complete_wifi_ack(ack_skb, acked);
 398                         } else {
 399                                 dev_kfree_skb_any(ack_skb);
 400                         }
 401                 }
 402         }
 403 }
 404
 405 /*
 406  * Use a static threshold for now, best value to be determined
 407  * by testing ...
 408  * Should it depend on:
 409  *  - on # of retransmissions
 410  *  - current throughput (higher value for higher tpt)?
 411  */
 412 #define STA_LOST_PKT_THRESHOLD  50
 413
 414 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 415 {
 416         struct sk_buff *skb2;
 417         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 418         struct ieee80211_local *local = hw_to_local(hw);
 419         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 420         __le16 fc;
 421         struct ieee80211_supported_band *sband;
 422         struct ieee80211_sub_if_data *sdata;
 423         struct net_device *prev_dev = NULL;
 424         struct sta_info *sta, *tmp;
 425         int retry_count = -1, i;
 426         int rates_idx = -1;
 427         bool send_to_cooked;
 428         bool acked;
 429         struct ieee80211_bar *bar;
 430         int rtap_len;
 431         int shift = 0;
 432
 433         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 434                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 435                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 436                         /* just the first aggr frame carry status info */
 437                         info->status.rates[i].idx = -1;
 438                         info->status.rates[i].count = 0;
 439                         break;
 440                 } else if (info->status.rates[i].idx < 0) {
 441                         break;
 442                 } else if (i >= hw->max_report_rates) {
 443                         /* the HW cannot have attempted that rate */
 444                         info->status.rates[i].idx = -1;
 445                         info->status.rates[i].count = 0;
 446                         break;
 447                 }
 448
 449                 retry_count += info->status.rates[i].count;
 450         }
 451         rates_idx = i - 1;
 452
 453         if (retry_count < 0)
 454                 retry_count = 0;
 455
 456         rcu_read_lock();
 457
 458         sband = local->hw.wiphy->bands[info->band];
 459         fc = hdr->frame_control;
 460
 461         for_each_sta_info(local, hdr->addr1, sta, tmp) {
 462                 /* skip wrong virtual interface */
 463                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
 464                         continue;
 465
 466                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 467
 468                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 469                         clear_sta_flag(sta, WLAN_STA_SP);
 470
 471                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 472                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 473                         /*
 474                          * The STA is in power save mode, so assume
 475                          * that this TX packet failed because of that.
 476                          */
 477                         ieee80211_handle_filtered_frame(local, sta, skb);
 478                         rcu_read_unlock();
 479                         return;
 480                 }
 481
 482                 /* mesh Peer Service Period support */
 483                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 484                     ieee80211_is_data_qos(fc))
 485                         ieee80211_mpsp_trigger_process(
 486                                         ieee80211_get_qos_ctl(hdr),
 487                                         sta, true, acked);
 488
 489                 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
 490                     (rates_idx != -1))
 491                         sta->last_tx_rate = info->status.rates[rates_idx];
 492
 493                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 494                     (ieee80211_is_data_qos(fc))) {
 495                         u16 tid, ssn;
 496                         u8 *qc;
 497
 498                         qc = ieee80211_get_qos_ctl(hdr);
 499                         tid = qc[0] & 0xf;
 500                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 501                                                 & IEEE80211_SCTL_SEQ);
 502                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 503                                            tid, ssn);
 504                 }
 505
 506                 if (!acked && ieee80211_is_back_req(fc)) {
 507                         u16 tid, control;
 508
 509                         /*
 510                          * BAR failed, store the last SSN and retry sending
 511                          * the BAR when the next unicast transmission on the
 512                          * same TID succeeds.
 513                          */
 514                         bar = (struct ieee80211_bar *) skb->data;
 515                         control = le16_to_cpu(bar->control);
 516                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 517                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 518
 519                                 tid = (control &
 520                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 521                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 522
 523                                 ieee80211_set_bar_pending(sta, tid, ssn);
 524                         }
 525                 }
 526
 527                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 528                         ieee80211_handle_filtered_frame(local, sta, skb);
 529                         rcu_read_unlock();
 530                         return;
 531                 } else {
 532                         if (!acked)
 533                                 sta->tx_retry_failed++;
 534                         sta->tx_retry_count += retry_count;
 535                 }
 536
 537                 rate_control_tx_status(local, sband, sta, skb);
 538                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 539                         ieee80211s_update_metric(local, sta, skb);
 540
 541                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 542                         ieee80211_frame_acked(sta, skb);
 543
 544                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
 545                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 546                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
 547
 548                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
 549                         if (info->flags & IEEE80211_TX_STAT_ACK) {
 550                                 if (sta->lost_packets)
 551                                         sta->lost_packets = 0;
 552                         } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
 553                                 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
 554                                                             sta->sta.addr,
 555                                                             sta->lost_packets,
 556                                                             GFP_ATOMIC);
 557                                 sta->lost_packets = 0;
 558                         }
 559                 }
 560
 561                 if (acked)
 562                         sta->last_ack_signal = info->status.ack_signal;
 563         }
 564
 565         rcu_read_unlock();
 566
 567         ieee80211_led_tx(local, 0);
 568
 569         /* SNMP counters
 570          * Fragments are passed to low-level drivers as separate skbs, so these
 571          * are actually fragments, not frames. Update frame counters only for
 572          * the first fragment of the frame. */
 573         if (info->flags & IEEE80211_TX_STAT_ACK) {
 574                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
 575                         local->dot11TransmittedFrameCount++;
 576                         if (is_multicast_ether_addr(hdr->addr1))
 577                                 local->dot11MulticastTransmittedFrameCount++;
 578                         if (retry_count > 0)
 579                                 local->dot11RetryCount++;
 580                         if (retry_count > 1)
 581                                 local->dot11MultipleRetryCount++;
 582                 }
 583
 584                 /* This counter shall be incremented for an acknowledged MPDU
 585                  * with an individual address in the address 1 field or an MPDU
 586                  * with a multicast address in the address 1 field of type Data
 587                  * or Management. */
 588                 if (!is_multicast_ether_addr(hdr->addr1) ||
 589                     ieee80211_is_data(fc) ||
 590                     ieee80211_is_mgmt(fc))
 591                         local->dot11TransmittedFragmentCount++;
 592         } else {
 593                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
 594                         local->dot11FailedCount++;
 595         }
 596
 597         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
 598             (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 599             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
 600             local->ps_sdata && !(local->scanning)) {
 601                 if (info->flags & IEEE80211_TX_STAT_ACK) {
 602                         local->ps_sdata->u.mgd.flags |=
 603                                         IEEE80211_STA_NULLFUNC_ACKED;
 604                 } else
 605                         mod_timer(&local->dynamic_ps_timer, jiffies +
 606                                         msecs_to_jiffies(10));
 607         }
 608
 609         ieee80211_report_used_skb(local, skb, false);
 610
 611         /* this was a transmitted frame, but now we want to reuse it */
 612         skb_orphan(skb);
 613
 614         /* Need to make a copy before skb->cb gets cleared */
 615         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
 616                          !(ieee80211_is_data(fc));
 617
 618         /*
 619          * This is a bit racy but we can avoid a lot of work
 620          * with this test...
 621          */
 622         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
 623                 dev_kfree_skb(skb);
 624                 return;
 625         }
 626
 627         /* send frame to monitor interfaces now */
 628         rtap_len = ieee80211_tx_radiotap_len(info);
 629         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 630                 pr_err("ieee80211_tx_status: headroom too small\n");
 631                 dev_kfree_skb(skb);
 632                 return;
 633         }
 634         ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len,
 635                                          shift);
 636
 637         /* XXX: is this sufficient for BPF? */
 638         skb_set_mac_header(skb, 0);
 639         skb->ip_summed = CHECKSUM_UNNECESSARY;
 640         skb->pkt_type = PACKET_OTHERHOST;
 641         skb->protocol = htons(ETH_P_802_2);
 642         memset(skb->cb, 0, sizeof(skb->cb));
 643
 644         rcu_read_lock();
 645         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 646                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 647                         if (!ieee80211_sdata_running(sdata))
 648                                 continue;
 649
 650                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
 651                             !send_to_cooked)
 652                                 continue;
 653
 654                         if (prev_dev) {
 655                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 656                                 if (skb2) {
 657                                         skb2->dev = prev_dev;
 658                                         netif_rx(skb2);
 659                                 }
 660                         }
 661
 662                         prev_dev = sdata->dev;
 663                 }
 664         }
 665         if (prev_dev) {
 666                 skb->dev = prev_dev;
 667                 netif_rx(skb);
 668                 skb = NULL;
 669         }
 670         rcu_read_unlock();
 671         dev_kfree_skb(skb);
 672 }
 673 EXPORT_SYMBOL(ieee80211_tx_status);
 674
 675 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
 676 {
 677         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
 678         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 679                                     num_packets, GFP_ATOMIC);
 680 }
 681 EXPORT_SYMBOL(ieee80211_report_low_ack);
 682
 683 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
 684 {
 685         struct ieee80211_local *local = hw_to_local(hw);
 686
 687         ieee80211_report_used_skb(local, skb, true);
 688         dev_kfree_skb_any(skb);
 689 }
 690 EXPORT_SYMBOL(ieee80211_free_txskb);
 691
 692 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
 693                               struct sk_buff_head *skbs)
 694 {
 695         struct sk_buff *skb;
 696
 697         while ((skb = __skb_dequeue(skbs)))
 698                 ieee80211_free_txskb(hw, skb);
 699 }