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                                              IEEE80211_TX_RC_VHT_MCS)))
 240                 len += 2;
 241
 242         /* IEEE80211_RADIOTAP_TX_FLAGS */
 243         len += 2;
 244
 245         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 246         len += 1;
 247
 248         /* IEEE80211_RADIOTAP_MCS
 249          * IEEE80211_RADIOTAP_VHT */
 250         if (info->status.rates[0].idx >= 0) {
 251                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 252                         len += 3;
 253                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 254                         len = ALIGN(len, 2) + 12;
 255         }
 256
 257         return len;
 258 }
 259
 260 static void
 261 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 262                                  struct ieee80211_supported_band *sband,
 263                                  struct sk_buff *skb, int retry_count,
 264                                  int rtap_len, int shift)
 265 {
 266         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 267         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 268         struct ieee80211_radiotap_header *rthdr;
 269         unsigned char *pos;
 270         u16 txflags;
 271
 272         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
 273
 274         memset(rthdr, 0, rtap_len);
 275         rthdr->it_len = cpu_to_le16(rtap_len);
 276         rthdr->it_present =
 277                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 278                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 279         pos = (unsigned char *)(rthdr + 1);
 280
 281         /*
 282          * XXX: Once radiotap gets the bitmap reset thing the vendor
 283          *      extensions proposal contains, we can actually report
 284          *      the whole set of tries we did.
 285          */
 286
 287         /* IEEE80211_RADIOTAP_RATE */
 288         if (info->status.rates[0].idx >= 0 &&
 289             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 290                                              IEEE80211_TX_RC_VHT_MCS))) {
 291                 u16 rate;
 292
 293                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 294                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
 295                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
 296                 /* padding for tx flags */
 297                 pos += 2;
 298         }
 299
 300         /* IEEE80211_RADIOTAP_TX_FLAGS */
 301         txflags = 0;
 302         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 303             !is_multicast_ether_addr(hdr->addr1))
 304                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 305
 306         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 307             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 308                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 309         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 310                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 311
 312         put_unaligned_le16(txflags, pos);
 313         pos += 2;
 314
 315         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 316         /* for now report the total retry_count */
 317         *pos = retry_count;
 318         pos++;
 319
 320         if (info->status.rates[0].idx < 0)
 321                 return;
 322
 323         /* IEEE80211_RADIOTAP_MCS
 324          * IEEE80211_RADIOTAP_VHT */
 325         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 326                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 327                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 328                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 329                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 330                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 331                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 332                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 333                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 334                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 335                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 336                 pos[2] = info->status.rates[0].idx;
 337                 pos += 3;
 338         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 339                 u16 known = local->hw.radiotap_vht_details &
 340                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 341                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 342
 343                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 344
 345                 /* required alignment from rthdr */
 346                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 347
 348                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 349                 put_unaligned_le16(known, pos);
 350                 pos += 2;
 351
 352                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 353                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 354                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 355                 pos++;
 356
 357                 /* u8 bandwidth */
 358                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 359                         *pos = 1;
 360                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 361                         *pos = 4;
 362                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 363                         *pos = 11;
 364                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 365                         *pos = 0;
 366                 pos++;
 367
 368                 /* u8 mcs_nss[4] */
 369                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 370                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 371                 pos += 4;
 372
 373                 /* u8 coding */
 374                 pos++;
 375                 /* u8 group_id */
 376                 pos++;
 377                 /* u16 partial_aid */
 378                 pos += 2;
 379         }
 380 }
 381
 382 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 383                                       struct sk_buff *skb, bool dropped)
 384 {
 385         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 386         struct ieee80211_hdr *hdr = (void *)skb->data;
 387         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 388
 389         if (dropped)
 390                 acked = false;
 391
 392         if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
 393                            IEEE80211_TX_INTFL_MLME_CONN_TX)) {
 394                 struct ieee80211_sub_if_data *sdata = NULL;
 395                 struct ieee80211_sub_if_data *iter_sdata;
 396                 u64 cookie = (unsigned long)skb;
 397
 398                 rcu_read_lock();
 399
 400                 if (skb->dev) {
 401                         list_for_each_entry_rcu(iter_sdata, &local->interfaces,
 402                                                 list) {
 403                                 if (!iter_sdata->dev)
 404                                         continue;
 405
 406                                 if (skb->dev == iter_sdata->dev) {
 407                                         sdata = iter_sdata;
 408                                         break;
 409                                 }
 410                         }
 411                 } else {
 412                         sdata = rcu_dereference(local->p2p_sdata);
 413                 }
 414
 415                 if (!sdata) {
 416                         skb->dev = NULL;
 417                 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 418                         ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control,
 419                                                      acked);
 420                 } else if (ieee80211_is_nullfunc(hdr->frame_control) ||
 421                            ieee80211_is_qos_nullfunc(hdr->frame_control)) {
 422                         cfg80211_probe_status(sdata->dev, hdr->addr1,
 423                                               cookie, acked, GFP_ATOMIC);
 424                 } else {
 425                         cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data,
 426                                                 skb->len, acked, GFP_ATOMIC);
 427                 }
 428
 429                 rcu_read_unlock();
 430         }
 431
 432         if (unlikely(info->ack_frame_id)) {
 433                 struct sk_buff *ack_skb;
 434                 unsigned long flags;
 435
 436                 spin_lock_irqsave(&local->ack_status_lock, flags);
 437                 ack_skb = idr_find(&local->ack_status_frames,
 438                                    info->ack_frame_id);
 439                 if (ack_skb)
 440                         idr_remove(&local->ack_status_frames,
 441                                    info->ack_frame_id);
 442                 spin_unlock_irqrestore(&local->ack_status_lock, flags);
 443
 444                 if (ack_skb) {
 445                         if (!dropped) {
 446                                 /* consumes ack_skb */
 447                                 skb_complete_wifi_ack(ack_skb, acked);
 448                         } else {
 449                                 dev_kfree_skb_any(ack_skb);
 450                         }
 451                 }
 452         }
 453 }
 454
 455 /*
 456  * Use a static threshold for now, best value to be determined
 457  * by testing ...
 458  * Should it depend on:
 459  *  - on # of retransmissions
 460  *  - current throughput (higher value for higher tpt)?
 461  */
 462 #define STA_LOST_PKT_THRESHOLD  50
 463
 464 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 465 {
 466         struct sk_buff *skb2;
 467         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 468         struct ieee80211_local *local = hw_to_local(hw);
 469         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 470         __le16 fc;
 471         struct ieee80211_supported_band *sband;
 472         struct ieee80211_sub_if_data *sdata;
 473         struct net_device *prev_dev = NULL;
 474         struct sta_info *sta, *tmp;
 475         int retry_count = -1, i;
 476         int rates_idx = -1;
 477         bool send_to_cooked;
 478         bool acked;
 479         struct ieee80211_bar *bar;
 480         int rtap_len;
 481         int shift = 0;
 482
 483         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 484                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 485                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 486                         /* just the first aggr frame carry status info */
 487                         info->status.rates[i].idx = -1;
 488                         info->status.rates[i].count = 0;
 489                         break;
 490                 } else if (info->status.rates[i].idx < 0) {
 491                         break;
 492                 } else if (i >= hw->max_report_rates) {
 493                         /* the HW cannot have attempted that rate */
 494                         info->status.rates[i].idx = -1;
 495                         info->status.rates[i].count = 0;
 496                         break;
 497                 }
 498
 499                 retry_count += info->status.rates[i].count;
 500         }
 501         rates_idx = i - 1;
 502
 503         if (retry_count < 0)
 504                 retry_count = 0;
 505
 506         rcu_read_lock();
 507
 508         sband = local->hw.wiphy->bands[info->band];
 509         fc = hdr->frame_control;
 510
 511         for_each_sta_info(local, hdr->addr1, sta, tmp) {
 512                 /* skip wrong virtual interface */
 513                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
 514                         continue;
 515
 516                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 517
 518                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 519                         clear_sta_flag(sta, WLAN_STA_SP);
 520
 521                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 522                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 523                         /*
 524                          * The STA is in power save mode, so assume
 525                          * that this TX packet failed because of that.
 526                          */
 527                         ieee80211_handle_filtered_frame(local, sta, skb);
 528                         rcu_read_unlock();
 529                         return;
 530                 }
 531
 532                 /* mesh Peer Service Period support */
 533                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 534                     ieee80211_is_data_qos(fc))
 535                         ieee80211_mpsp_trigger_process(
 536                                         ieee80211_get_qos_ctl(hdr),
 537                                         sta, true, acked);
 538
 539                 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
 540                     (rates_idx != -1))
 541                         sta->last_tx_rate = info->status.rates[rates_idx];
 542
 543                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 544                     (ieee80211_is_data_qos(fc))) {
 545                         u16 tid, ssn;
 546                         u8 *qc;
 547
 548                         qc = ieee80211_get_qos_ctl(hdr);
 549                         tid = qc[0] & 0xf;
 550                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 551                                                 & IEEE80211_SCTL_SEQ);
 552                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 553                                            tid, ssn);
 554                 }
 555
 556                 if (!acked && ieee80211_is_back_req(fc)) {
 557                         u16 tid, control;
 558
 559                         /*
 560                          * BAR failed, store the last SSN and retry sending
 561                          * the BAR when the next unicast transmission on the
 562                          * same TID succeeds.
 563                          */
 564                         bar = (struct ieee80211_bar *) skb->data;
 565                         control = le16_to_cpu(bar->control);
 566                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 567                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 568
 569                                 tid = (control &
 570                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 571                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 572
 573                                 ieee80211_set_bar_pending(sta, tid, ssn);
 574                         }
 575                 }
 576
 577                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 578                         ieee80211_handle_filtered_frame(local, sta, skb);
 579                         rcu_read_unlock();
 580                         return;
 581                 } else {
 582                         if (!acked)
 583                                 sta->tx_retry_failed++;
 584                         sta->tx_retry_count += retry_count;
 585                 }
 586
 587                 rate_control_tx_status(local, sband, sta, skb);
 588                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 589                         ieee80211s_update_metric(local, sta, skb);
 590
 591                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 592                         ieee80211_frame_acked(sta, skb);
 593
 594                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
 595                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 596                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
 597
 598                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
 599                         if (info->flags & IEEE80211_TX_STAT_ACK) {
 600                                 if (sta->lost_packets)
 601                                         sta->lost_packets = 0;
 602                         } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
 603                                 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
 604                                                             sta->sta.addr,
 605                                                             sta->lost_packets,
 606                                                             GFP_ATOMIC);
 607                                 sta->lost_packets = 0;
 608                         }
 609                 }
 610
 611                 if (acked)
 612                         sta->last_ack_signal = info->status.ack_signal;
 613         }
 614
 615         rcu_read_unlock();
 616
 617         ieee80211_led_tx(local);
 618
 619         /* SNMP counters
 620          * Fragments are passed to low-level drivers as separate skbs, so these
 621          * are actually fragments, not frames. Update frame counters only for
 622          * the first fragment of the frame. */
 623         if (info->flags & IEEE80211_TX_STAT_ACK) {
 624                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
 625                         local->dot11TransmittedFrameCount++;
 626                         if (is_multicast_ether_addr(hdr->addr1))
 627                                 local->dot11MulticastTransmittedFrameCount++;
 628                         if (retry_count > 0)
 629                                 local->dot11RetryCount++;
 630                         if (retry_count > 1)
 631                                 local->dot11MultipleRetryCount++;
 632                 }
 633
 634                 /* This counter shall be incremented for an acknowledged MPDU
 635                  * with an individual address in the address 1 field or an MPDU
 636                  * with a multicast address in the address 1 field of type Data
 637                  * or Management. */
 638                 if (!is_multicast_ether_addr(hdr->addr1) ||
 639                     ieee80211_is_data(fc) ||
 640                     ieee80211_is_mgmt(fc))
 641                         local->dot11TransmittedFragmentCount++;
 642         } else {
 643                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
 644                         local->dot11FailedCount++;
 645         }
 646
 647         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
 648             (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 649             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
 650             local->ps_sdata && !(local->scanning)) {
 651                 if (info->flags & IEEE80211_TX_STAT_ACK) {
 652                         local->ps_sdata->u.mgd.flags |=
 653                                         IEEE80211_STA_NULLFUNC_ACKED;
 654                 } else
 655                         mod_timer(&local->dynamic_ps_timer, jiffies +
 656                                         msecs_to_jiffies(10));
 657         }
 658
 659         ieee80211_report_used_skb(local, skb, false);
 660
 661         /* this was a transmitted frame, but now we want to reuse it */
 662         skb_orphan(skb);
 663
 664         /* Need to make a copy before skb->cb gets cleared */
 665         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
 666                          !(ieee80211_is_data(fc));
 667
 668         /*
 669          * This is a bit racy but we can avoid a lot of work
 670          * with this test...
 671          */
 672         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
 673                 dev_kfree_skb(skb);
 674                 return;
 675         }
 676
 677         /* send frame to monitor interfaces now */
 678         rtap_len = ieee80211_tx_radiotap_len(info);
 679         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 680                 pr_err("ieee80211_tx_status: headroom too small\n");
 681                 dev_kfree_skb(skb);
 682                 return;
 683         }
 684         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 685                                          rtap_len, shift);
 686
 687         /* XXX: is this sufficient for BPF? */
 688         skb_set_mac_header(skb, 0);
 689         skb->ip_summed = CHECKSUM_UNNECESSARY;
 690         skb->pkt_type = PACKET_OTHERHOST;
 691         skb->protocol = htons(ETH_P_802_2);
 692         memset(skb->cb, 0, sizeof(skb->cb));
 693
 694         rcu_read_lock();
 695         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 696                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 697                         if (!ieee80211_sdata_running(sdata))
 698                                 continue;
 699
 700                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
 701                             !send_to_cooked)
 702                                 continue;
 703
 704                         if (prev_dev) {
 705                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 706                                 if (skb2) {
 707                                         skb2->dev = prev_dev;
 708                                         netif_rx(skb2);
 709                                 }
 710                         }
 711
 712                         prev_dev = sdata->dev;
 713                 }
 714         }
 715         if (prev_dev) {
 716                 skb->dev = prev_dev;
 717                 netif_rx(skb);
 718                 skb = NULL;
 719         }
 720         rcu_read_unlock();
 721         dev_kfree_skb(skb);
 722 }
 723 EXPORT_SYMBOL(ieee80211_tx_status);
 724
 725 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
 726 {
 727         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
 728         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 729                                     num_packets, GFP_ATOMIC);
 730 }
 731 EXPORT_SYMBOL(ieee80211_report_low_ack);
 732
 733 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
 734 {
 735         struct ieee80211_local *local = hw_to_local(hw);
 736
 737         ieee80211_report_used_skb(local, skb, true);
 738         dev_kfree_skb_any(skb);
 739 }
 740 EXPORT_SYMBOL(ieee80211_free_txskb);
 741
 742 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
 743                               struct sk_buff_head *skbs)
 744 {
 745         struct sk_buff *skb;
 746
 747         while ((skb = __skb_dequeue(skbs)))
 748                 ieee80211_free_txskb(hw, skb);
 749 }