net/mac80211/status.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  */
   9
  10 #include <linux/export.h>
  11 #include <linux/etherdevice.h>
  12 #include <net/mac80211.h>
  13 #include <asm/unaligned.h>
  14 #include "ieee80211_i.h"
  15 #include "rate.h"
  16 #include "mesh.h"
  17 #include "led.h"
  18 #include "wme.h"
  19
  20
  21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  22                                  struct sk_buff *skb)
  23 {
  24         struct ieee80211_local *local = hw_to_local(hw);
  25         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  26         int tmp;
  27
  28         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  29         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  30                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  31         tmp = skb_queue_len(&local->skb_queue) +
  32                 skb_queue_len(&local->skb_queue_unreliable);
  33         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  34                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  35                 ieee80211_free_txskb(hw, skb);
  36                 tmp--;
  37                 I802_DEBUG_INC(local->tx_status_drop);
  38         }
  39         tasklet_schedule(&local->tasklet);
  40 }
  41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  42
  43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  44                                             struct sta_info *sta,
  45                                             struct sk_buff *skb)
  46 {
  47         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  48         struct ieee80211_hdr *hdr = (void *)skb->data;
  49         int ac;
  50
  51         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  52                            IEEE80211_TX_CTL_AMPDU)) {
  53                 ieee80211_free_txskb(&local->hw, skb);
  54                 return;
  55         }
  56
  57         /*
  58          * This skb 'survived' a round-trip through the driver, and
  59          * hopefully the driver didn't mangle it too badly. However,
  60          * we can definitely not rely on the control information
  61          * being correct. Clear it so we don't get junk there, and
  62          * indicate that it needs new processing, but must not be
  63          * modified/encrypted again.
  64          */
  65         memset(&info->control, 0, sizeof(info->control));
  66
  67         info->control.jiffies = jiffies;
  68         info->control.vif = &sta->sdata->vif;
  69         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  70                        IEEE80211_TX_INTFL_RETRANSMISSION;
  71         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  72
  73         sta->status_stats.filtered++;
  74
  75         /*
  76          * Clear more-data bit on filtered frames, it might be set
  77          * but later frames might time out so it might have to be
  78          * clear again ... It's all rather unlikely (this frame
  79          * should time out first, right?) but let's not confuse
  80          * peers unnecessarily.
  81          */
  82         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  83                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  84
  85         if (ieee80211_is_data_qos(hdr->frame_control)) {
  86                 u8 *p = ieee80211_get_qos_ctl(hdr);
  87                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  88
  89                 /*
  90                  * Clear EOSP if set, this could happen e.g.
  91                  * if an absence period (us being a P2P GO)
  92                  * shortens the SP.
  93                  */
  94                 if (*p & IEEE80211_QOS_CTL_EOSP)
  95                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  96                 ac = ieee80211_ac_from_tid(tid);
  97         } else {
  98                 ac = IEEE80211_AC_BE;
  99         }
 100
 101         /*
 102          * Clear the TX filter mask for this STA when sending the next
 103          * packet. If the STA went to power save mode, this will happen
 104          * when it wakes up for the next time.
 105          */
 106         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 107         ieee80211_clear_fast_xmit(sta);
 108
 109         /*
 110          * This code races in the following way:
 111          *
 112          *  (1) STA sends frame indicating it will go to sleep and does so
 113          *  (2) hardware/firmware adds STA to filter list, passes frame up
 114          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 115          *  (4) we get TX status before having processed the frame and
 116          *      knowing that the STA has gone to sleep.
 117          *
 118          * This is actually quite unlikely even when both those events are
 119          * processed from interrupts coming in quickly after one another or
 120          * even at the same time because we queue both TX status events and
 121          * RX frames to be processed by a tasklet and process them in the
 122          * same order that they were received or TX status last. Hence, there
 123          * is no race as long as the frame RX is processed before the next TX
 124          * status, which drivers can ensure, see below.
 125          *
 126          * Note that this can only happen if the hardware or firmware can
 127          * actually add STAs to the filter list, if this is done by the
 128          * driver in response to set_tim() (which will only reduce the race
 129          * this whole filtering tries to solve, not completely solve it)
 130          * this situation cannot happen.
 131          *
 132          * To completely solve this race drivers need to make sure that they
 133          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 134          *      functions and
 135          *  (b) always process RX events before TX status events if ordering
 136          *      can be unknown, for example with different interrupt status
 137          *      bits.
 138          *  (c) if PS mode transitions are manual (i.e. the flag
 139          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 140          *      changes before calling TX status events if ordering can be
 141          *      unknown.
 142          */
 143         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 144             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 145                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 146                 sta_info_recalc_tim(sta);
 147
 148                 if (!timer_pending(&local->sta_cleanup))
 149                         mod_timer(&local->sta_cleanup,
 150                                   round_jiffies(jiffies +
 151                                                 STA_INFO_CLEANUP_INTERVAL));
 152                 return;
 153         }
 154
 155         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 156             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 157                 /* Software retry the packet once */
 158                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 159                 ieee80211_add_pending_skb(local, skb);
 160                 return;
 161         }
 162
 163         ps_dbg_ratelimited(sta->sdata,
 164                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 165                            skb_queue_len(&sta->tx_filtered[ac]),
 166                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 167         ieee80211_free_txskb(&local->hw, skb);
 168 }
 169
 170 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 171 {
 172         struct tid_ampdu_tx *tid_tx;
 173
 174         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 175         if (!tid_tx || !tid_tx->bar_pending)
 176                 return;
 177
 178         tid_tx->bar_pending = false;
 179         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 180 }
 181
 182 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 183 {
 184         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 185         struct ieee80211_local *local = sta->local;
 186         struct ieee80211_sub_if_data *sdata = sta->sdata;
 187         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 188
 189         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 190                 sta->status_stats.last_ack = jiffies;
 191                 if (txinfo->status.is_valid_ack_signal) {
 192                         sta->status_stats.last_ack_signal =
 193                                          (s8)txinfo->status.ack_signal;
 194                         sta->status_stats.ack_signal_filled = true;
 195                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
 196                                             -txinfo->status.ack_signal);
 197                 }
 198         }
 199
 200         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 201                 struct ieee80211_hdr *hdr = (void *) skb->data;
 202                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 203                 u16 tid = qc[0] & 0xf;
 204
 205                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 206         }
 207
 208         if (ieee80211_is_action(mgmt->frame_control) &&
 209             !ieee80211_has_protected(mgmt->frame_control) &&
 210             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 211             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 212             ieee80211_sdata_running(sdata)) {
 213                 enum ieee80211_smps_mode smps_mode;
 214
 215                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 216                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 217                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 218                         break;
 219                 case WLAN_HT_SMPS_CONTROL_STATIC:
 220                         smps_mode = IEEE80211_SMPS_STATIC;
 221                         break;
 222                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 223                 default: /* shouldn't happen since we don't send that */
 224                         smps_mode = IEEE80211_SMPS_OFF;
 225                         break;
 226                 }
 227
 228                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 229                         /*
 230                          * This update looks racy, but isn't -- if we come
 231                          * here we've definitely got a station that we're
 232                          * talking to, and on a managed interface that can
 233                          * only be the AP. And the only other place updating
 234                          * this variable in managed mode is before association.
 235                          */
 236                         sdata->smps_mode = smps_mode;
 237                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 238                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 239                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 240                         sta->known_smps_mode = smps_mode;
 241                 }
 242         }
 243 }
 244
 245 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 246 {
 247         struct tid_ampdu_tx *tid_tx;
 248
 249         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 250         if (!tid_tx)
 251                 return;
 252
 253         tid_tx->failed_bar_ssn = ssn;
 254         tid_tx->bar_pending = true;
 255 }
 256
 257 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 258                                      struct ieee80211_tx_status *status)
 259 {
 260         int len = sizeof(struct ieee80211_radiotap_header);
 261
 262         /* IEEE80211_RADIOTAP_RATE rate */
 263         if (status && status->rate && !(status->rate->flags &
 264                                         (RATE_INFO_FLAGS_MCS |
 265                                          RATE_INFO_FLAGS_60G |
 266                                          RATE_INFO_FLAGS_VHT_MCS |
 267                                          RATE_INFO_FLAGS_HE_MCS)))
 268                 len += 2;
 269         else if (info->status.rates[0].idx >= 0 &&
 270                  !(info->status.rates[0].flags &
 271                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 272                 len += 2;
 273
 274         /* IEEE80211_RADIOTAP_TX_FLAGS */
 275         len += 2;
 276
 277         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 278         len += 1;
 279
 280         /* IEEE80211_RADIOTAP_MCS
 281          * IEEE80211_RADIOTAP_VHT */
 282         if (status && status->rate) {
 283                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 284                         len += 3;
 285                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 286                         len = ALIGN(len, 2) + 12;
 287                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 288                         len = ALIGN(len, 2) + 12;
 289         } else if (info->status.rates[0].idx >= 0) {
 290                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 291                         len += 3;
 292                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 293                         len = ALIGN(len, 2) + 12;
 294         }
 295
 296         return len;
 297 }
 298
 299 static void
 300 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 301                                  struct ieee80211_supported_band *sband,
 302                                  struct sk_buff *skb, int retry_count,
 303                                  int rtap_len, int shift,
 304                                  struct ieee80211_tx_status *status)
 305 {
 306         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 307         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 308         struct ieee80211_radiotap_header *rthdr;
 309         unsigned char *pos;
 310         u16 legacy_rate = 0;
 311         u16 txflags;
 312
 313         rthdr = skb_push(skb, rtap_len);
 314
 315         memset(rthdr, 0, rtap_len);
 316         rthdr->it_len = cpu_to_le16(rtap_len);
 317         rthdr->it_present =
 318                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 319                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 320         pos = (unsigned char *)(rthdr + 1);
 321
 322         /*
 323          * XXX: Once radiotap gets the bitmap reset thing the vendor
 324          *      extensions proposal contains, we can actually report
 325          *      the whole set of tries we did.
 326          */
 327
 328         /* IEEE80211_RADIOTAP_RATE */
 329
 330         if (status && status->rate && !(status->rate->flags &
 331                                         (RATE_INFO_FLAGS_MCS |
 332                                          RATE_INFO_FLAGS_60G |
 333                                          RATE_INFO_FLAGS_VHT_MCS |
 334                                          RATE_INFO_FLAGS_HE_MCS)))
 335                 legacy_rate = status->rate->legacy;
 336         else if (info->status.rates[0].idx >= 0 &&
 337                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 338                                                   IEEE80211_TX_RC_VHT_MCS)))
 339                 legacy_rate =
 340                         sband->bitrates[info->status.rates[0].idx].bitrate;
 341
 342         if (legacy_rate) {
 343                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 344                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 345                 /* padding for tx flags */
 346                 pos += 2;
 347         }
 348
 349         /* IEEE80211_RADIOTAP_TX_FLAGS */
 350         txflags = 0;
 351         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 352             !is_multicast_ether_addr(hdr->addr1))
 353                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 354
 355         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 356                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 357         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 358                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 359
 360         put_unaligned_le16(txflags, pos);
 361         pos += 2;
 362
 363         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 364         /* for now report the total retry_count */
 365         *pos = retry_count;
 366         pos++;
 367
 368         if (status && status->rate &&
 369             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 370                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 371                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 372                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 373                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 374                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 375                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 376                 if (status->rate->bw == RATE_INFO_BW_40)
 377                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 378                 pos[2] = status->rate->mcs;
 379                 pos += 3;
 380         } else if (status && status->rate &&
 381                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 382                 u16 known = local->hw.radiotap_vht_details &
 383                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 384                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 385
 386                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 387
 388                 /* required alignment from rthdr */
 389                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 390
 391                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 392                 put_unaligned_le16(known, pos);
 393                 pos += 2;
 394
 395                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 396                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 397                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 398                 pos++;
 399
 400                 /* u8 bandwidth */
 401                 switch (status->rate->bw) {
 402                 case RATE_INFO_BW_160:
 403                         *pos = 11;
 404                         break;
 405                 case RATE_INFO_BW_80:
 406                         *pos = 2;
 407                         break;
 408                 case RATE_INFO_BW_40:
 409                         *pos = 1;
 410                         break;
 411                 default:
 412                         *pos = 0;
 413                         break;
 414                 }
 415
 416                 /* u8 mcs_nss[4] */
 417                 *pos = (status->rate->mcs << 4) | status->rate->nss;
 418                 pos += 4;
 419
 420                 /* u8 coding */
 421                 pos++;
 422                 /* u8 group_id */
 423                 pos++;
 424                 /* u16 partial_aid */
 425                 pos += 2;
 426         } else if (status && status->rate &&
 427                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 428                 struct ieee80211_radiotap_he *he;
 429
 430                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 431
 432                 /* required alignment from rthdr */
 433                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 434                 he = (struct ieee80211_radiotap_he *)pos;
 435
 436                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 437                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 438                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 439                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 440
 441                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 442
 443 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 444
 445                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 446
 447 #define CHECK_GI(s) \
 448         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 449         (int)NL80211_RATE_INFO_HE_GI_##s)
 450
 451                 CHECK_GI(0_8);
 452                 CHECK_GI(1_6);
 453                 CHECK_GI(3_2);
 454
 455                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 456                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 457
 458                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 459
 460                 switch (status->rate->bw) {
 461                 case RATE_INFO_BW_20:
 462                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 463                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 464                         break;
 465                 case RATE_INFO_BW_40:
 466                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 467                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 468                         break;
 469                 case RATE_INFO_BW_80:
 470                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 471                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 472                         break;
 473                 case RATE_INFO_BW_160:
 474                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 475                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 476                         break;
 477                 case RATE_INFO_BW_HE_RU:
 478 #define CHECK_RU_ALLOC(s) \
 479         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 480         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 481
 482                         CHECK_RU_ALLOC(26);
 483                         CHECK_RU_ALLOC(52);
 484                         CHECK_RU_ALLOC(106);
 485                         CHECK_RU_ALLOC(242);
 486                         CHECK_RU_ALLOC(484);
 487                         CHECK_RU_ALLOC(996);
 488                         CHECK_RU_ALLOC(2x996);
 489
 490                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 491                                              status->rate->he_ru_alloc + 4);
 492                         break;
 493                 default:
 494                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 495                 }
 496
 497                 pos += sizeof(struct ieee80211_radiotap_he);
 498         }
 499
 500         if ((status && status->rate) || info->status.rates[0].idx < 0)
 501                 return;
 502
 503         /* IEEE80211_RADIOTAP_MCS
 504          * IEEE80211_RADIOTAP_VHT */
 505         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 506                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 507                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 508                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 509                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 510                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 511                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 512                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 513                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 514                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 515                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 516                 pos[2] = info->status.rates[0].idx;
 517                 pos += 3;
 518         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 519                 u16 known = local->hw.radiotap_vht_details &
 520                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 521                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 522
 523                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 524
 525                 /* required alignment from rthdr */
 526                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 527
 528                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 529                 put_unaligned_le16(known, pos);
 530                 pos += 2;
 531
 532                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 533                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 534                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 535                 pos++;
 536
 537                 /* u8 bandwidth */
 538                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 539                         *pos = 1;
 540                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 541                         *pos = 4;
 542                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 543                         *pos = 11;
 544                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 545                         *pos = 0;
 546                 pos++;
 547
 548                 /* u8 mcs_nss[4] */
 549                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 550                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 551                 pos += 4;
 552
 553                 /* u8 coding */
 554                 pos++;
 555                 /* u8 group_id */
 556                 pos++;
 557                 /* u16 partial_aid */
 558                 pos += 2;
 559         }
 560 }
 561
 562 /*
 563  * Handles the tx for TDLS teardown frames.
 564  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 565  */
 566 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 567                                         struct ieee80211_sub_if_data *sdata,
 568                                         struct sk_buff *skb, u32 flags)
 569 {
 570         struct sk_buff *teardown_skb;
 571         struct sk_buff *orig_teardown_skb;
 572         bool is_teardown = false;
 573
 574         /* Get the teardown data we need and free the lock */
 575         spin_lock(&sdata->u.mgd.teardown_lock);
 576         teardown_skb = sdata->u.mgd.teardown_skb;
 577         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 578         if ((skb == orig_teardown_skb) && teardown_skb) {
 579                 sdata->u.mgd.teardown_skb = NULL;
 580                 sdata->u.mgd.orig_teardown_skb = NULL;
 581                 is_teardown = true;
 582         }
 583         spin_unlock(&sdata->u.mgd.teardown_lock);
 584
 585         if (is_teardown) {
 586                 /* This mechanism relies on being able to get ACKs */
 587                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 588
 589                 /* Check if peer has ACKed */
 590                 if (flags & IEEE80211_TX_STAT_ACK) {
 591                         dev_kfree_skb_any(teardown_skb);
 592                 } else {
 593                         tdls_dbg(sdata,
 594                                  "TDLS Resending teardown through AP\n");
 595
 596                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 597                 }
 598         }
 599 }
 600
 601 static struct ieee80211_sub_if_data *
 602 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 603 {
 604         struct ieee80211_sub_if_data *sdata;
 605
 606         if (skb->dev) {
 607                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 608                         if (!sdata->dev)
 609                                 continue;
 610
 611                         if (skb->dev == sdata->dev)
 612                                 return sdata;
 613                 }
 614
 615                 return NULL;
 616         }
 617
 618         return rcu_dereference(local->p2p_sdata);
 619 }
 620
 621 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 622                                      struct ieee80211_tx_info *info,
 623                                      bool acked, bool dropped)
 624 {
 625         struct sk_buff *skb;
 626         unsigned long flags;
 627
 628         spin_lock_irqsave(&local->ack_status_lock, flags);
 629         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 630         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 631
 632         if (!skb)
 633                 return;
 634
 635         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 636                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 637                 struct ieee80211_sub_if_data *sdata;
 638                 struct ieee80211_hdr *hdr = (void *)skb->data;
 639
 640                 rcu_read_lock();
 641                 sdata = ieee80211_sdata_from_skb(local, skb);
 642                 if (sdata) {
 643                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
 644                             ieee80211_is_qos_nullfunc(hdr->frame_control))
 645                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 646                                                       cookie, acked,
 647                                                       info->status.ack_signal,
 648                                                       info->status.is_valid_ack_signal,
 649                                                       GFP_ATOMIC);
 650                         else
 651                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 652                                                         skb->data, skb->len,
 653                                                         acked, GFP_ATOMIC);
 654                 }
 655                 rcu_read_unlock();
 656
 657                 dev_kfree_skb_any(skb);
 658         } else if (dropped) {
 659                 dev_kfree_skb_any(skb);
 660         } else {
 661                 /* consumes skb */
 662                 skb_complete_wifi_ack(skb, acked);
 663         }
 664 }
 665
 666 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 667                                       struct sk_buff *skb, bool dropped)
 668 {
 669         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 670         struct ieee80211_hdr *hdr = (void *)skb->data;
 671         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 672
 673         if (dropped)
 674                 acked = false;
 675
 676         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 677                 struct ieee80211_sub_if_data *sdata;
 678
 679                 rcu_read_lock();
 680
 681                 sdata = ieee80211_sdata_from_skb(local, skb);
 682
 683                 if (!sdata) {
 684                         skb->dev = NULL;
 685                 } else {
 686                         unsigned int hdr_size =
 687                                 ieee80211_hdrlen(hdr->frame_control);
 688
 689                         /* Check to see if packet is a TDLS teardown packet */
 690                         if (ieee80211_is_data(hdr->frame_control) &&
 691                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 692                              WLAN_TDLS_TEARDOWN))
 693                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 694                                                             info->flags);
 695                         else
 696                                 ieee80211_mgd_conn_tx_status(sdata,
 697                                                              hdr->frame_control,
 698                                                              acked);
 699                 }
 700
 701                 rcu_read_unlock();
 702         } else if (info->ack_frame_id) {
 703                 ieee80211_report_ack_skb(local, info, acked, dropped);
 704         }
 705
 706         if (!dropped && skb->destructor) {
 707                 skb->wifi_acked_valid = 1;
 708                 skb->wifi_acked = acked;
 709         }
 710
 711         ieee80211_led_tx(local);
 712
 713         if (skb_has_frag_list(skb)) {
 714                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 715                 skb_shinfo(skb)->frag_list = NULL;
 716         }
 717 }
 718
 719 /*
 720  * Use a static threshold for now, best value to be determined
 721  * by testing ...
 722  * Should it depend on:
 723  *  - on # of retransmissions
 724  *  - current throughput (higher value for higher tpt)?
 725  */
 726 #define STA_LOST_PKT_THRESHOLD  50
 727 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 728 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 729
 730 static void ieee80211_lost_packet(struct sta_info *sta,
 731                                   struct ieee80211_tx_info *info)
 732 {
 733         /* If driver relies on its own algorithm for station kickout, skip
 734          * mac80211 packet loss mechanism.
 735          */
 736         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 737                 return;
 738
 739         /* This packet was aggregated but doesn't carry status info */
 740         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 741             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 742                 return;
 743
 744         sta->status_stats.lost_packets++;
 745         if (!sta->sta.tdls &&
 746             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
 747                 return;
 748
 749         /*
 750          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 751          * of the last packets were lost, and that no ACK was received in the
 752          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 753          * mechanism.
 754          */
 755         if (sta->sta.tdls &&
 756             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
 757              time_before(jiffies,
 758                          sta->status_stats.last_tdls_pkt_time +
 759                          STA_LOST_TDLS_PKT_TIME)))
 760                 return;
 761
 762         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 763                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 764         sta->status_stats.lost_packets = 0;
 765 }
 766
 767 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 768                                   struct ieee80211_tx_info *info,
 769                                   int *retry_count)
 770 {
 771         int rates_idx = -1;
 772         int count = -1;
 773         int i;
 774
 775         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 776                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 777                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 778                         /* just the first aggr frame carry status info */
 779                         info->status.rates[i].idx = -1;
 780                         info->status.rates[i].count = 0;
 781                         break;
 782                 } else if (info->status.rates[i].idx < 0) {
 783                         break;
 784                 } else if (i >= hw->max_report_rates) {
 785                         /* the HW cannot have attempted that rate */
 786                         info->status.rates[i].idx = -1;
 787                         info->status.rates[i].count = 0;
 788                         break;
 789                 }
 790
 791                 count += info->status.rates[i].count;
 792         }
 793         rates_idx = i - 1;
 794
 795         if (count < 0)
 796                 count = 0;
 797
 798         *retry_count = count;
 799         return rates_idx;
 800 }
 801
 802 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 803                           struct ieee80211_supported_band *sband,
 804                           int retry_count, int shift, bool send_to_cooked,
 805                           struct ieee80211_tx_status *status)
 806 {
 807         struct sk_buff *skb2;
 808         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 809         struct ieee80211_sub_if_data *sdata;
 810         struct net_device *prev_dev = NULL;
 811         int rtap_len;
 812
 813         /* send frame to monitor interfaces now */
 814         rtap_len = ieee80211_tx_radiotap_len(info, status);
 815         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 816                 pr_err("ieee80211_tx_status: headroom too small\n");
 817                 dev_kfree_skb(skb);
 818                 return;
 819         }
 820         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 821                                          rtap_len, shift, status);
 822
 823         /* XXX: is this sufficient for BPF? */
 824         skb_reset_mac_header(skb);
 825         skb->ip_summed = CHECKSUM_UNNECESSARY;
 826         skb->pkt_type = PACKET_OTHERHOST;
 827         skb->protocol = htons(ETH_P_802_2);
 828         memset(skb->cb, 0, sizeof(skb->cb));
 829
 830         rcu_read_lock();
 831         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 832                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 833                         if (!ieee80211_sdata_running(sdata))
 834                                 continue;
 835
 836                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 837                             !send_to_cooked)
 838                                 continue;
 839
 840                         if (prev_dev) {
 841                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 842                                 if (skb2) {
 843                                         skb2->dev = prev_dev;
 844                                         netif_rx(skb2);
 845                                 }
 846                         }
 847
 848                         prev_dev = sdata->dev;
 849                 }
 850         }
 851         if (prev_dev) {
 852                 skb->dev = prev_dev;
 853                 netif_rx(skb);
 854                 skb = NULL;
 855         }
 856         rcu_read_unlock();
 857         dev_kfree_skb(skb);
 858 }
 859
 860 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 861                                   struct ieee80211_tx_status *status)
 862 {
 863         struct sk_buff *skb = status->skb;
 864         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 865         struct ieee80211_local *local = hw_to_local(hw);
 866         struct ieee80211_tx_info *info = status->info;
 867         struct sta_info *sta;
 868         __le16 fc;
 869         struct ieee80211_supported_band *sband;
 870         int retry_count;
 871         int rates_idx;
 872         bool send_to_cooked;
 873         bool acked;
 874         struct ieee80211_bar *bar;
 875         int shift = 0;
 876         int tid = IEEE80211_NUM_TIDS;
 877
 878         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
 879
 880         sband = local->hw.wiphy->bands[info->band];
 881         fc = hdr->frame_control;
 882
 883         if (status->sta) {
 884                 sta = container_of(status->sta, struct sta_info, sta);
 885                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 886
 887                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 888                         clear_sta_flag(sta, WLAN_STA_SP);
 889
 890                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 891
 892                 /* mesh Peer Service Period support */
 893                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 894                     ieee80211_is_data_qos(fc))
 895                         ieee80211_mpsp_trigger_process(
 896                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 897
 898                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 899                         /*
 900                          * The STA is in power save mode, so assume
 901                          * that this TX packet failed because of that.
 902                          */
 903                         ieee80211_handle_filtered_frame(local, sta, skb);
 904                         return;
 905                 }
 906
 907                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 908                     (ieee80211_is_data(hdr->frame_control)) &&
 909                     (rates_idx != -1))
 910                         sta->tx_stats.last_rate =
 911                                 info->status.rates[rates_idx];
 912
 913                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 914                     (ieee80211_is_data_qos(fc))) {
 915                         u16 ssn;
 916                         u8 *qc;
 917
 918                         qc = ieee80211_get_qos_ctl(hdr);
 919                         tid = qc[0] & 0xf;
 920                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 921                                                 & IEEE80211_SCTL_SEQ);
 922                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 923                                            tid, ssn);
 924                 } else if (ieee80211_is_data_qos(fc)) {
 925                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 926
 927                         tid = qc[0] & 0xf;
 928                 }
 929
 930                 if (!acked && ieee80211_is_back_req(fc)) {
 931                         u16 control;
 932
 933                         /*
 934                          * BAR failed, store the last SSN and retry sending
 935                          * the BAR when the next unicast transmission on the
 936                          * same TID succeeds.
 937                          */
 938                         bar = (struct ieee80211_bar *) skb->data;
 939                         control = le16_to_cpu(bar->control);
 940                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 941                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 942
 943                                 tid = (control &
 944                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 945                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 946
 947                                 ieee80211_set_bar_pending(sta, tid, ssn);
 948                         }
 949                 }
 950
 951                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 952                         ieee80211_handle_filtered_frame(local, sta, skb);
 953                         return;
 954                 } else {
 955                         if (!acked)
 956                                 sta->status_stats.retry_failed++;
 957                         sta->status_stats.retry_count += retry_count;
 958
 959                         if (ieee80211_is_data_present(fc)) {
 960                                 if (!acked)
 961                                         sta->status_stats.msdu_failed[tid]++;
 962
 963                                 sta->status_stats.msdu_retries[tid] +=
 964                                         retry_count;
 965                         }
 966                 }
 967
 968                 rate_control_tx_status(local, sband, status);
 969                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 970                         ieee80211s_update_metric(local, sta, status);
 971
 972                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 973                         ieee80211_frame_acked(sta, skb);
 974
 975                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
 976                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 977                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
 978                                                 acked, info->status.tx_time);
 979
 980                 if (info->status.tx_time &&
 981                     wiphy_ext_feature_isset(local->hw.wiphy,
 982                                             NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
 983                         ieee80211_sta_register_airtime(&sta->sta, tid,
 984                                                        info->status.tx_time, 0);
 985
 986                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 987                         if (info->flags & IEEE80211_TX_STAT_ACK) {
 988                                 if (sta->status_stats.lost_packets)
 989                                         sta->status_stats.lost_packets = 0;
 990
 991                                 /* Track when last TDLS packet was ACKed */
 992                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 993                                         sta->status_stats.last_tdls_pkt_time =
 994                                                 jiffies;
 995                         } else {
 996                                 ieee80211_lost_packet(sta, info);
 997                         }
 998                 }
 999         }
1000
1001         /* SNMP counters
1002          * Fragments are passed to low-level drivers as separate skbs, so these
1003          * are actually fragments, not frames. Update frame counters only for
1004          * the first fragment of the frame. */
1005         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1006             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1007                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1008                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1009                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1010                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1011                         if (retry_count > 0)
1012                                 I802_DEBUG_INC(local->dot11RetryCount);
1013                         if (retry_count > 1)
1014                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1015                 }
1016
1017                 /* This counter shall be incremented for an acknowledged MPDU
1018                  * with an individual address in the address 1 field or an MPDU
1019                  * with a multicast address in the address 1 field of type Data
1020                  * or Management. */
1021                 if (!is_multicast_ether_addr(hdr->addr1) ||
1022                     ieee80211_is_data(fc) ||
1023                     ieee80211_is_mgmt(fc))
1024                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1025         } else {
1026                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1027                         I802_DEBUG_INC(local->dot11FailedCount);
1028         }
1029
1030         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
1031             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1032             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1033             local->ps_sdata && !(local->scanning)) {
1034                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1035                         local->ps_sdata->u.mgd.flags |=
1036                                         IEEE80211_STA_NULLFUNC_ACKED;
1037                 } else
1038                         mod_timer(&local->dynamic_ps_timer, jiffies +
1039                                         msecs_to_jiffies(10));
1040         }
1041
1042         ieee80211_report_used_skb(local, skb, false);
1043
1044         /* this was a transmitted frame, but now we want to reuse it */
1045         skb_orphan(skb);
1046
1047         /* Need to make a copy before skb->cb gets cleared */
1048         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1049                          !(ieee80211_is_data(fc));
1050
1051         /*
1052          * This is a bit racy but we can avoid a lot of work
1053          * with this test...
1054          */
1055         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1056                 dev_kfree_skb(skb);
1057                 return;
1058         }
1059
1060         /* send to monitor interfaces */
1061         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1062                              send_to_cooked, status);
1063 }
1064
1065 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1066 {
1067         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1068         struct ieee80211_local *local = hw_to_local(hw);
1069         struct ieee80211_tx_status status = {
1070                 .skb = skb,
1071                 .info = IEEE80211_SKB_CB(skb),
1072         };
1073         struct rhlist_head *tmp;
1074         struct sta_info *sta;
1075
1076         rcu_read_lock();
1077
1078         for_each_sta_info(local, hdr->addr1, sta, tmp) {
1079                 /* skip wrong virtual interface */
1080                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
1081                         continue;
1082
1083                 status.sta = &sta->sta;
1084                 break;
1085         }
1086
1087         __ieee80211_tx_status(hw, &status);
1088         rcu_read_unlock();
1089 }
1090 EXPORT_SYMBOL(ieee80211_tx_status);
1091
1092 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1093                              struct ieee80211_tx_status *status)
1094 {
1095         struct ieee80211_local *local = hw_to_local(hw);
1096         struct ieee80211_tx_info *info = status->info;
1097         struct ieee80211_sta *pubsta = status->sta;
1098         struct ieee80211_supported_band *sband;
1099         int retry_count;
1100         bool acked, noack_success;
1101
1102         if (status->skb)
1103                 return __ieee80211_tx_status(hw, status);
1104
1105         if (!status->sta)
1106                 return;
1107
1108         ieee80211_tx_get_rates(hw, info, &retry_count);
1109
1110         sband = hw->wiphy->bands[info->band];
1111
1112         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1113         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1114
1115         if (pubsta) {
1116                 struct sta_info *sta;
1117
1118                 sta = container_of(pubsta, struct sta_info, sta);
1119
1120                 if (!acked)
1121                         sta->status_stats.retry_failed++;
1122                 sta->status_stats.retry_count += retry_count;
1123
1124                 if (acked) {
1125                         sta->status_stats.last_ack = jiffies;
1126
1127                         if (sta->status_stats.lost_packets)
1128                                 sta->status_stats.lost_packets = 0;
1129
1130                         /* Track when last TDLS packet was ACKed */
1131                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
1132                                 sta->status_stats.last_tdls_pkt_time = jiffies;
1133                 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1134                         return;
1135                 } else {
1136                         ieee80211_lost_packet(sta, info);
1137                 }
1138
1139                 rate_control_tx_status(local, sband, status);
1140                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1141                         ieee80211s_update_metric(local, sta, status);
1142         }
1143
1144         if (acked || noack_success) {
1145                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1146                 if (!pubsta)
1147                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1148                 if (retry_count > 0)
1149                         I802_DEBUG_INC(local->dot11RetryCount);
1150                 if (retry_count > 1)
1151                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1152         } else {
1153                 I802_DEBUG_INC(local->dot11FailedCount);
1154         }
1155 }
1156 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1157
1158 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1159                               struct ieee80211_sta *pubsta,
1160                               struct ieee80211_tx_info *info)
1161 {
1162         struct ieee80211_local *local = hw_to_local(hw);
1163         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1164         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1165         struct ieee80211_tx_status status = {
1166                 .info = info,
1167                 .sta = pubsta,
1168         };
1169
1170         rate_control_tx_status(local, sband, &status);
1171
1172         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1173                 sta->tx_stats.last_rate = info->status.rates[0];
1174 }
1175 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1176
1177 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1178 {
1179         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1180         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1181                                     num_packets, GFP_ATOMIC);
1182 }
1183 EXPORT_SYMBOL(ieee80211_report_low_ack);
1184
1185 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1186 {
1187         struct ieee80211_local *local = hw_to_local(hw);
1188
1189         ieee80211_report_used_skb(local, skb, true);
1190         dev_kfree_skb_any(skb);
1191 }
1192 EXPORT_SYMBOL(ieee80211_free_txskb);
1193
1194 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1195                               struct sk_buff_head *skbs)
1196 {
1197         struct sk_buff *skb;
1198
1199         while ((skb = __skb_dequeue(skbs)))
1200                 ieee80211_free_txskb(hw, skb);
1201 }