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_TX_CTL_HW_80211_ENCAP)) {
  54                 ieee80211_free_txskb(&local->hw, skb);
  55                 return;
  56         }
  57
  58         /*
  59          * This skb 'survived' a round-trip through the driver, and
  60          * hopefully the driver didn't mangle it too badly. However,
  61          * we can definitely not rely on the control information
  62          * being correct. Clear it so we don't get junk there, and
  63          * indicate that it needs new processing, but must not be
  64          * modified/encrypted again.
  65          */
  66         memset(&info->control, 0, sizeof(info->control));
  67
  68         info->control.jiffies = jiffies;
  69         info->control.vif = &sta->sdata->vif;
  70         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
  71         info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
  72         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  73
  74         sta->status_stats.filtered++;
  75
  76         /*
  77          * Clear more-data bit on filtered frames, it might be set
  78          * but later frames might time out so it might have to be
  79          * clear again ... It's all rather unlikely (this frame
  80          * should time out first, right?) but let's not confuse
  81          * peers unnecessarily.
  82          */
  83         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  84                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  85
  86         if (ieee80211_is_data_qos(hdr->frame_control)) {
  87                 u8 *p = ieee80211_get_qos_ctl(hdr);
  88                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  89
  90                 /*
  91                  * Clear EOSP if set, this could happen e.g.
  92                  * if an absence period (us being a P2P GO)
  93                  * shortens the SP.
  94                  */
  95                 if (*p & IEEE80211_QOS_CTL_EOSP)
  96                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  97                 ac = ieee80211_ac_from_tid(tid);
  98         } else {
  99                 ac = IEEE80211_AC_BE;
 100         }
 101
 102         /*
 103          * Clear the TX filter mask for this STA when sending the next
 104          * packet. If the STA went to power save mode, this will happen
 105          * when it wakes up for the next time.
 106          */
 107         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 108         ieee80211_clear_fast_xmit(sta);
 109
 110         /*
 111          * This code races in the following way:
 112          *
 113          *  (1) STA sends frame indicating it will go to sleep and does so
 114          *  (2) hardware/firmware adds STA to filter list, passes frame up
 115          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 116          *  (4) we get TX status before having processed the frame and
 117          *      knowing that the STA has gone to sleep.
 118          *
 119          * This is actually quite unlikely even when both those events are
 120          * processed from interrupts coming in quickly after one another or
 121          * even at the same time because we queue both TX status events and
 122          * RX frames to be processed by a tasklet and process them in the
 123          * same order that they were received or TX status last. Hence, there
 124          * is no race as long as the frame RX is processed before the next TX
 125          * status, which drivers can ensure, see below.
 126          *
 127          * Note that this can only happen if the hardware or firmware can
 128          * actually add STAs to the filter list, if this is done by the
 129          * driver in response to set_tim() (which will only reduce the race
 130          * this whole filtering tries to solve, not completely solve it)
 131          * this situation cannot happen.
 132          *
 133          * To completely solve this race drivers need to make sure that they
 134          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 135          *      functions and
 136          *  (b) always process RX events before TX status events if ordering
 137          *      can be unknown, for example with different interrupt status
 138          *      bits.
 139          *  (c) if PS mode transitions are manual (i.e. the flag
 140          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 141          *      changes before calling TX status events if ordering can be
 142          *      unknown.
 143          */
 144         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 145             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 146                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 147                 sta_info_recalc_tim(sta);
 148
 149                 if (!timer_pending(&local->sta_cleanup))
 150                         mod_timer(&local->sta_cleanup,
 151                                   round_jiffies(jiffies +
 152                                                 STA_INFO_CLEANUP_INTERVAL));
 153                 return;
 154         }
 155
 156         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 157             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 158                 /* Software retry the packet once */
 159                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 160                 ieee80211_add_pending_skb(local, skb);
 161                 return;
 162         }
 163
 164         ps_dbg_ratelimited(sta->sdata,
 165                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 166                            skb_queue_len(&sta->tx_filtered[ac]),
 167                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 168         ieee80211_free_txskb(&local->hw, skb);
 169 }
 170
 171 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 172 {
 173         struct tid_ampdu_tx *tid_tx;
 174
 175         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 176         if (!tid_tx || !tid_tx->bar_pending)
 177                 return;
 178
 179         tid_tx->bar_pending = false;
 180         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 181 }
 182
 183 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 184 {
 185         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 186         struct ieee80211_local *local = sta->local;
 187         struct ieee80211_sub_if_data *sdata = sta->sdata;
 188
 189         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 190                 struct ieee80211_hdr *hdr = (void *) skb->data;
 191                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 192                 u16 tid = qc[0] & 0xf;
 193
 194                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 195         }
 196
 197         if (ieee80211_is_action(mgmt->frame_control) &&
 198             !ieee80211_has_protected(mgmt->frame_control) &&
 199             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 200             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 201             ieee80211_sdata_running(sdata)) {
 202                 enum ieee80211_smps_mode smps_mode;
 203
 204                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 205                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 206                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 207                         break;
 208                 case WLAN_HT_SMPS_CONTROL_STATIC:
 209                         smps_mode = IEEE80211_SMPS_STATIC;
 210                         break;
 211                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 212                 default: /* shouldn't happen since we don't send that */
 213                         smps_mode = IEEE80211_SMPS_OFF;
 214                         break;
 215                 }
 216
 217                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 218                         /*
 219                          * This update looks racy, but isn't -- if we come
 220                          * here we've definitely got a station that we're
 221                          * talking to, and on a managed interface that can
 222                          * only be the AP. And the only other place updating
 223                          * this variable in managed mode is before association.
 224                          */
 225                         sdata->smps_mode = smps_mode;
 226                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 227                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 228                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 229                         sta->known_smps_mode = smps_mode;
 230                 }
 231         }
 232 }
 233
 234 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 235 {
 236         struct tid_ampdu_tx *tid_tx;
 237
 238         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 239         if (!tid_tx)
 240                 return;
 241
 242         tid_tx->failed_bar_ssn = ssn;
 243         tid_tx->bar_pending = true;
 244 }
 245
 246 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 247                                      struct ieee80211_tx_status *status)
 248 {
 249         int len = sizeof(struct ieee80211_radiotap_header);
 250
 251         /* IEEE80211_RADIOTAP_RATE rate */
 252         if (status && status->rate && !(status->rate->flags &
 253                                         (RATE_INFO_FLAGS_MCS |
 254                                          RATE_INFO_FLAGS_DMG |
 255                                          RATE_INFO_FLAGS_EDMG |
 256                                          RATE_INFO_FLAGS_VHT_MCS |
 257                                          RATE_INFO_FLAGS_HE_MCS)))
 258                 len += 2;
 259         else if (info->status.rates[0].idx >= 0 &&
 260                  !(info->status.rates[0].flags &
 261                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 262                 len += 2;
 263
 264         /* IEEE80211_RADIOTAP_TX_FLAGS */
 265         len += 2;
 266
 267         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 268         len += 1;
 269
 270         /* IEEE80211_RADIOTAP_MCS
 271          * IEEE80211_RADIOTAP_VHT */
 272         if (status && status->rate) {
 273                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 274                         len += 3;
 275                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 276                         len = ALIGN(len, 2) + 12;
 277                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 278                         len = ALIGN(len, 2) + 12;
 279         } else if (info->status.rates[0].idx >= 0) {
 280                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 281                         len += 3;
 282                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 283                         len = ALIGN(len, 2) + 12;
 284         }
 285
 286         return len;
 287 }
 288
 289 static void
 290 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 291                                  struct ieee80211_supported_band *sband,
 292                                  struct sk_buff *skb, int retry_count,
 293                                  int rtap_len, int shift,
 294                                  struct ieee80211_tx_status *status)
 295 {
 296         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 297         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 298         struct ieee80211_radiotap_header *rthdr;
 299         unsigned char *pos;
 300         u16 legacy_rate = 0;
 301         u16 txflags;
 302
 303         rthdr = skb_push(skb, rtap_len);
 304
 305         memset(rthdr, 0, rtap_len);
 306         rthdr->it_len = cpu_to_le16(rtap_len);
 307         rthdr->it_present =
 308                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 309                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 310         pos = (unsigned char *)(rthdr + 1);
 311
 312         /*
 313          * XXX: Once radiotap gets the bitmap reset thing the vendor
 314          *      extensions proposal contains, we can actually report
 315          *      the whole set of tries we did.
 316          */
 317
 318         /* IEEE80211_RADIOTAP_RATE */
 319
 320         if (status && status->rate) {
 321                 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 322                                              RATE_INFO_FLAGS_DMG |
 323                                              RATE_INFO_FLAGS_EDMG |
 324                                              RATE_INFO_FLAGS_VHT_MCS |
 325                                              RATE_INFO_FLAGS_HE_MCS)))
 326                         legacy_rate = status->rate->legacy;
 327         } else if (info->status.rates[0].idx >= 0 &&
 328                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 329                                                   IEEE80211_TX_RC_VHT_MCS)))
 330                 legacy_rate =
 331                         sband->bitrates[info->status.rates[0].idx].bitrate;
 332
 333         if (legacy_rate) {
 334                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 335                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 336                 /* padding for tx flags */
 337                 pos += 2;
 338         }
 339
 340         /* IEEE80211_RADIOTAP_TX_FLAGS */
 341         txflags = 0;
 342         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 343             !is_multicast_ether_addr(hdr->addr1))
 344                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 345
 346         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 347                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 348         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 349                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 350
 351         put_unaligned_le16(txflags, pos);
 352         pos += 2;
 353
 354         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 355         /* for now report the total retry_count */
 356         *pos = retry_count;
 357         pos++;
 358
 359         if (status && status->rate &&
 360             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 361                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 362                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 363                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 364                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 365                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 366                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 367                 if (status->rate->bw == RATE_INFO_BW_40)
 368                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 369                 pos[2] = status->rate->mcs;
 370                 pos += 3;
 371         } else if (status && status->rate &&
 372                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 373                 u16 known = local->hw.radiotap_vht_details &
 374                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 375                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 376
 377                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 378
 379                 /* required alignment from rthdr */
 380                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 381
 382                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 383                 put_unaligned_le16(known, pos);
 384                 pos += 2;
 385
 386                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 387                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 388                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 389                 pos++;
 390
 391                 /* u8 bandwidth */
 392                 switch (status->rate->bw) {
 393                 case RATE_INFO_BW_160:
 394                         *pos = 11;
 395                         break;
 396                 case RATE_INFO_BW_80:
 397                         *pos = 4;
 398                         break;
 399                 case RATE_INFO_BW_40:
 400                         *pos = 1;
 401                         break;
 402                 default:
 403                         *pos = 0;
 404                         break;
 405                 }
 406                 pos++;
 407
 408                 /* u8 mcs_nss[4] */
 409                 *pos = (status->rate->mcs << 4) | status->rate->nss;
 410                 pos += 4;
 411
 412                 /* u8 coding */
 413                 pos++;
 414                 /* u8 group_id */
 415                 pos++;
 416                 /* u16 partial_aid */
 417                 pos += 2;
 418         } else if (status && status->rate &&
 419                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 420                 struct ieee80211_radiotap_he *he;
 421
 422                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 423
 424                 /* required alignment from rthdr */
 425                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 426                 he = (struct ieee80211_radiotap_he *)pos;
 427
 428                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 429                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 430                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 431                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 432
 433                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 434
 435 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 436
 437                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 438
 439 #define CHECK_GI(s) \
 440         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 441         (int)NL80211_RATE_INFO_HE_GI_##s)
 442
 443                 CHECK_GI(0_8);
 444                 CHECK_GI(1_6);
 445                 CHECK_GI(3_2);
 446
 447                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 448                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 449
 450                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 451
 452                 switch (status->rate->bw) {
 453                 case RATE_INFO_BW_20:
 454                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 455                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 456                         break;
 457                 case RATE_INFO_BW_40:
 458                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 459                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 460                         break;
 461                 case RATE_INFO_BW_80:
 462                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 463                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 464                         break;
 465                 case RATE_INFO_BW_160:
 466                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 467                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 468                         break;
 469                 case RATE_INFO_BW_HE_RU:
 470 #define CHECK_RU_ALLOC(s) \
 471         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 472         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 473
 474                         CHECK_RU_ALLOC(26);
 475                         CHECK_RU_ALLOC(52);
 476                         CHECK_RU_ALLOC(106);
 477                         CHECK_RU_ALLOC(242);
 478                         CHECK_RU_ALLOC(484);
 479                         CHECK_RU_ALLOC(996);
 480                         CHECK_RU_ALLOC(2x996);
 481
 482                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 483                                              status->rate->he_ru_alloc + 4);
 484                         break;
 485                 default:
 486                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 487                 }
 488
 489                 pos += sizeof(struct ieee80211_radiotap_he);
 490         }
 491
 492         if ((status && status->rate) || info->status.rates[0].idx < 0)
 493                 return;
 494
 495         /* IEEE80211_RADIOTAP_MCS
 496          * IEEE80211_RADIOTAP_VHT */
 497         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 498                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 499                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 500                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 501                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 502                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 503                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 504                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 505                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 506                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 507                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 508                 pos[2] = info->status.rates[0].idx;
 509                 pos += 3;
 510         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 511                 u16 known = local->hw.radiotap_vht_details &
 512                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 513                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 514
 515                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 516
 517                 /* required alignment from rthdr */
 518                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 519
 520                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 521                 put_unaligned_le16(known, pos);
 522                 pos += 2;
 523
 524                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 525                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 526                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 527                 pos++;
 528
 529                 /* u8 bandwidth */
 530                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 531                         *pos = 1;
 532                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 533                         *pos = 4;
 534                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 535                         *pos = 11;
 536                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 537                         *pos = 0;
 538                 pos++;
 539
 540                 /* u8 mcs_nss[4] */
 541                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 542                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 543                 pos += 4;
 544
 545                 /* u8 coding */
 546                 pos++;
 547                 /* u8 group_id */
 548                 pos++;
 549                 /* u16 partial_aid */
 550                 pos += 2;
 551         }
 552 }
 553
 554 /*
 555  * Handles the tx for TDLS teardown frames.
 556  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 557  */
 558 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 559                                         struct ieee80211_sub_if_data *sdata,
 560                                         struct sk_buff *skb, u32 flags)
 561 {
 562         struct sk_buff *teardown_skb;
 563         struct sk_buff *orig_teardown_skb;
 564         bool is_teardown = false;
 565
 566         /* Get the teardown data we need and free the lock */
 567         spin_lock(&sdata->u.mgd.teardown_lock);
 568         teardown_skb = sdata->u.mgd.teardown_skb;
 569         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 570         if ((skb == orig_teardown_skb) && teardown_skb) {
 571                 sdata->u.mgd.teardown_skb = NULL;
 572                 sdata->u.mgd.orig_teardown_skb = NULL;
 573                 is_teardown = true;
 574         }
 575         spin_unlock(&sdata->u.mgd.teardown_lock);
 576
 577         if (is_teardown) {
 578                 /* This mechanism relies on being able to get ACKs */
 579                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 580
 581                 /* Check if peer has ACKed */
 582                 if (flags & IEEE80211_TX_STAT_ACK) {
 583                         dev_kfree_skb_any(teardown_skb);
 584                 } else {
 585                         tdls_dbg(sdata,
 586                                  "TDLS Resending teardown through AP\n");
 587
 588                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 589                 }
 590         }
 591 }
 592
 593 static struct ieee80211_sub_if_data *
 594 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 595 {
 596         struct ieee80211_sub_if_data *sdata;
 597
 598         if (skb->dev) {
 599                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 600                         if (!sdata->dev)
 601                                 continue;
 602
 603                         if (skb->dev == sdata->dev)
 604                                 return sdata;
 605                 }
 606
 607                 return NULL;
 608         }
 609
 610         return rcu_dereference(local->p2p_sdata);
 611 }
 612
 613 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 614                                      struct ieee80211_tx_info *info,
 615                                      bool acked, bool dropped)
 616 {
 617         struct sk_buff *skb;
 618         unsigned long flags;
 619
 620         spin_lock_irqsave(&local->ack_status_lock, flags);
 621         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 622         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 623
 624         if (!skb)
 625                 return;
 626
 627         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 628                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 629                 struct ieee80211_sub_if_data *sdata;
 630                 struct ieee80211_hdr *hdr = (void *)skb->data;
 631
 632                 rcu_read_lock();
 633                 sdata = ieee80211_sdata_from_skb(local, skb);
 634                 if (sdata) {
 635                         if (skb->protocol == sdata->control_port_protocol ||
 636                             skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
 637                                 cfg80211_control_port_tx_status(&sdata->wdev,
 638                                                                 cookie,
 639                                                                 skb->data,
 640                                                                 skb->len,
 641                                                                 acked,
 642                                                                 GFP_ATOMIC);
 643                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 644                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 645                                                       cookie, acked,
 646                                                       info->status.ack_signal,
 647                                                       info->status.is_valid_ack_signal,
 648                                                       GFP_ATOMIC);
 649                         else if (ieee80211_is_mgmt(hdr->frame_control))
 650                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 651                                                         skb->data, skb->len,
 652                                                         acked, GFP_ATOMIC);
 653                         else
 654                                 pr_warn("Unknown status report in ack skb\n");
 655
 656                 }
 657                 rcu_read_unlock();
 658
 659                 dev_kfree_skb_any(skb);
 660         } else if (dropped) {
 661                 dev_kfree_skb_any(skb);
 662         } else {
 663                 /* consumes skb */
 664                 skb_complete_wifi_ack(skb, acked);
 665         }
 666 }
 667
 668 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 669                                       struct sk_buff *skb, bool dropped)
 670 {
 671         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 672         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 673         struct ieee80211_hdr *hdr = (void *)skb->data;
 674         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 675
 676         if (dropped)
 677                 acked = false;
 678
 679         if (tx_time_est) {
 680                 struct sta_info *sta;
 681
 682                 rcu_read_lock();
 683
 684                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 685                 ieee80211_sta_update_pending_airtime(local, sta,
 686                                                      skb_get_queue_mapping(skb),
 687                                                      tx_time_est,
 688                                                      true);
 689                 rcu_read_unlock();
 690         }
 691
 692         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 693                 struct ieee80211_sub_if_data *sdata;
 694
 695                 rcu_read_lock();
 696
 697                 sdata = ieee80211_sdata_from_skb(local, skb);
 698
 699                 if (!sdata) {
 700                         skb->dev = NULL;
 701                 } else {
 702                         unsigned int hdr_size =
 703                                 ieee80211_hdrlen(hdr->frame_control);
 704
 705                         /* Check to see if packet is a TDLS teardown packet */
 706                         if (ieee80211_is_data(hdr->frame_control) &&
 707                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 708                              WLAN_TDLS_TEARDOWN))
 709                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 710                                                             info->flags);
 711                         else
 712                                 ieee80211_mgd_conn_tx_status(sdata,
 713                                                              hdr->frame_control,
 714                                                              acked);
 715                 }
 716
 717                 rcu_read_unlock();
 718         } else if (info->ack_frame_id) {
 719                 ieee80211_report_ack_skb(local, info, acked, dropped);
 720         }
 721
 722         if (!dropped && skb->destructor) {
 723                 skb->wifi_acked_valid = 1;
 724                 skb->wifi_acked = acked;
 725         }
 726
 727         ieee80211_led_tx(local);
 728
 729         if (skb_has_frag_list(skb)) {
 730                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 731                 skb_shinfo(skb)->frag_list = NULL;
 732         }
 733 }
 734
 735 /*
 736  * Use a static threshold for now, best value to be determined
 737  * by testing ...
 738  * Should it depend on:
 739  *  - on # of retransmissions
 740  *  - current throughput (higher value for higher tpt)?
 741  */
 742 #define STA_LOST_PKT_THRESHOLD  50
 743 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 744 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 745 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 746
 747 static void ieee80211_lost_packet(struct sta_info *sta,
 748                                   struct ieee80211_tx_info *info)
 749 {
 750         unsigned long pkt_time = STA_LOST_PKT_TIME;
 751         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 752
 753         /* If driver relies on its own algorithm for station kickout, skip
 754          * mac80211 packet loss mechanism.
 755          */
 756         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 757                 return;
 758
 759         /* This packet was aggregated but doesn't carry status info */
 760         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 761             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 762                 return;
 763
 764         sta->status_stats.lost_packets++;
 765         if (sta->sta.tdls) {
 766                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 767                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 768         }
 769
 770         /*
 771          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 772          * of the last packets were lost, and that no ACK was received in the
 773          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 774          * mechanism.
 775          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 776          */
 777         if (sta->status_stats.lost_packets < pkt_thr ||
 778             !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
 779                 return;
 780
 781         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 782                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 783         sta->status_stats.lost_packets = 0;
 784 }
 785
 786 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 787                                   struct ieee80211_tx_info *info,
 788                                   int *retry_count)
 789 {
 790         int count = -1;
 791         int i;
 792
 793         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 794                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 795                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 796                         /* just the first aggr frame carry status info */
 797                         info->status.rates[i].idx = -1;
 798                         info->status.rates[i].count = 0;
 799                         break;
 800                 } else if (info->status.rates[i].idx < 0) {
 801                         break;
 802                 } else if (i >= hw->max_report_rates) {
 803                         /* the HW cannot have attempted that rate */
 804                         info->status.rates[i].idx = -1;
 805                         info->status.rates[i].count = 0;
 806                         break;
 807                 }
 808
 809                 count += info->status.rates[i].count;
 810         }
 811
 812         if (count < 0)
 813                 count = 0;
 814
 815         *retry_count = count;
 816         return i - 1;
 817 }
 818
 819 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 820                           struct ieee80211_supported_band *sband,
 821                           int retry_count, int shift, bool send_to_cooked,
 822                           struct ieee80211_tx_status *status)
 823 {
 824         struct sk_buff *skb2;
 825         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 826         struct ieee80211_sub_if_data *sdata;
 827         struct net_device *prev_dev = NULL;
 828         int rtap_len;
 829
 830         /* send frame to monitor interfaces now */
 831         rtap_len = ieee80211_tx_radiotap_len(info, status);
 832         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 833                 pr_err("ieee80211_tx_status: headroom too small\n");
 834                 dev_kfree_skb(skb);
 835                 return;
 836         }
 837         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 838                                          rtap_len, shift, status);
 839
 840         /* XXX: is this sufficient for BPF? */
 841         skb_reset_mac_header(skb);
 842         skb->ip_summed = CHECKSUM_UNNECESSARY;
 843         skb->pkt_type = PACKET_OTHERHOST;
 844         skb->protocol = htons(ETH_P_802_2);
 845         memset(skb->cb, 0, sizeof(skb->cb));
 846
 847         rcu_read_lock();
 848         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 849                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 850                         if (!ieee80211_sdata_running(sdata))
 851                                 continue;
 852
 853                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 854                             !send_to_cooked)
 855                                 continue;
 856
 857                         if (prev_dev) {
 858                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 859                                 if (skb2) {
 860                                         skb2->dev = prev_dev;
 861                                         netif_rx(skb2);
 862                                 }
 863                         }
 864
 865                         prev_dev = sdata->dev;
 866                 }
 867         }
 868         if (prev_dev) {
 869                 skb->dev = prev_dev;
 870                 netif_rx(skb);
 871                 skb = NULL;
 872         }
 873         rcu_read_unlock();
 874         dev_kfree_skb(skb);
 875 }
 876
 877 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 878                                   struct ieee80211_tx_status *status,
 879                                   int rates_idx, int retry_count)
 880 {
 881         struct sk_buff *skb = status->skb;
 882         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 883         struct ieee80211_local *local = hw_to_local(hw);
 884         struct ieee80211_tx_info *info = status->info;
 885         struct sta_info *sta;
 886         __le16 fc;
 887         struct ieee80211_supported_band *sband;
 888         bool send_to_cooked;
 889         bool acked;
 890         bool noack_success;
 891         struct ieee80211_bar *bar;
 892         int shift = 0;
 893         int tid = IEEE80211_NUM_TIDS;
 894
 895         sband = local->hw.wiphy->bands[info->band];
 896         fc = hdr->frame_control;
 897
 898         if (status->sta) {
 899                 sta = container_of(status->sta, struct sta_info, sta);
 900                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 901
 902                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 903                         clear_sta_flag(sta, WLAN_STA_SP);
 904
 905                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 906                 noack_success = !!(info->flags &
 907                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 908
 909                 /* mesh Peer Service Period support */
 910                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 911                     ieee80211_is_data_qos(fc))
 912                         ieee80211_mpsp_trigger_process(
 913                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 914
 915                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 916                     (ieee80211_is_data(hdr->frame_control)) &&
 917                     (rates_idx != -1))
 918                         sta->tx_stats.last_rate =
 919                                 info->status.rates[rates_idx];
 920
 921                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 922                     (ieee80211_is_data_qos(fc))) {
 923                         u16 ssn;
 924                         u8 *qc;
 925
 926                         qc = ieee80211_get_qos_ctl(hdr);
 927                         tid = qc[0] & 0xf;
 928                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 929                                                 & IEEE80211_SCTL_SEQ);
 930                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 931                                            tid, ssn);
 932                 } else if (ieee80211_is_data_qos(fc)) {
 933                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 934
 935                         tid = qc[0] & 0xf;
 936                 }
 937
 938                 if (!acked && ieee80211_is_back_req(fc)) {
 939                         u16 control;
 940
 941                         /*
 942                          * BAR failed, store the last SSN and retry sending
 943                          * the BAR when the next unicast transmission on the
 944                          * same TID succeeds.
 945                          */
 946                         bar = (struct ieee80211_bar *) skb->data;
 947                         control = le16_to_cpu(bar->control);
 948                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 949                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 950
 951                                 tid = (control &
 952                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 953                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 954
 955                                 ieee80211_set_bar_pending(sta, tid, ssn);
 956                         }
 957                 }
 958
 959                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 960                         ieee80211_handle_filtered_frame(local, sta, skb);
 961                         return;
 962                 } else if (ieee80211_is_data_present(fc)) {
 963                         if (!acked && !noack_success)
 964                                 sta->status_stats.msdu_failed[tid]++;
 965
 966                         sta->status_stats.msdu_retries[tid] +=
 967                                 retry_count;
 968                 }
 969
 970                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 971                         ieee80211_frame_acked(sta, skb);
 972
 973         } else if (wiphy_ext_feature_isset(local->hw.wiphy,
 974                                            NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) {
 975                 struct ieee80211_sub_if_data *sdata;
 976                 struct ieee80211_txq *txq;
 977                 u32 airtime;
 978
 979                 /* Account airtime to multicast queue */
 980                 sdata = ieee80211_sdata_from_skb(local, skb);
 981
 982                 if (sdata && (txq = sdata->vif.txq)) {
 983                         airtime = info->status.tx_time ?:
 984                                 ieee80211_calc_expected_tx_airtime(hw,
 985                                                                    &sdata->vif,
 986                                                                    NULL,
 987                                                                    skb->len,
 988                                                                    false);
 989
 990                         ieee80211_register_airtime(txq, airtime, 0);
 991                 }
 992         }
 993
 994         /* SNMP counters
 995          * Fragments are passed to low-level drivers as separate skbs, so these
 996          * are actually fragments, not frames. Update frame counters only for
 997          * the first fragment of the frame. */
 998         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
 999             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1000                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1001                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1002                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1003                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1004                         if (retry_count > 0)
1005                                 I802_DEBUG_INC(local->dot11RetryCount);
1006                         if (retry_count > 1)
1007                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1008                 }
1009
1010                 /* This counter shall be incremented for an acknowledged MPDU
1011                  * with an individual address in the address 1 field or an MPDU
1012                  * with a multicast address in the address 1 field of type Data
1013                  * or Management. */
1014                 if (!is_multicast_ether_addr(hdr->addr1) ||
1015                     ieee80211_is_data(fc) ||
1016                     ieee80211_is_mgmt(fc))
1017                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1018         } else {
1019                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1020                         I802_DEBUG_INC(local->dot11FailedCount);
1021         }
1022
1023         if (ieee80211_is_any_nullfunc(fc) &&
1024             ieee80211_has_pm(fc) &&
1025             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1026             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1027             local->ps_sdata && !(local->scanning)) {
1028                 if (info->flags & IEEE80211_TX_STAT_ACK)
1029                         local->ps_sdata->u.mgd.flags |=
1030                                         IEEE80211_STA_NULLFUNC_ACKED;
1031                 mod_timer(&local->dynamic_ps_timer,
1032                           jiffies + msecs_to_jiffies(10));
1033         }
1034
1035         ieee80211_report_used_skb(local, skb, false);
1036
1037         /* this was a transmitted frame, but now we want to reuse it */
1038         skb_orphan(skb);
1039
1040         /* Need to make a copy before skb->cb gets cleared */
1041         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1042                          !(ieee80211_is_data(fc));
1043
1044         /*
1045          * This is a bit racy but we can avoid a lot of work
1046          * with this test...
1047          */
1048         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1049                 if (status->free_list)
1050                         list_add_tail(&skb->list, status->free_list);
1051                 else
1052                         dev_kfree_skb(skb);
1053                 return;
1054         }
1055
1056         /* send to monitor interfaces */
1057         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1058                              send_to_cooked, status);
1059 }
1060
1061 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1062 {
1063         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1064         struct ieee80211_local *local = hw_to_local(hw);
1065         struct ieee80211_tx_status status = {
1066                 .skb = skb,
1067                 .info = IEEE80211_SKB_CB(skb),
1068         };
1069         struct sta_info *sta;
1070
1071         rcu_read_lock();
1072
1073         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1074         if (sta)
1075                 status.sta = &sta->sta;
1076
1077         ieee80211_tx_status_ext(hw, &status);
1078         rcu_read_unlock();
1079 }
1080 EXPORT_SYMBOL(ieee80211_tx_status);
1081
1082 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1083                              struct ieee80211_tx_status *status)
1084 {
1085         struct ieee80211_local *local = hw_to_local(hw);
1086         struct ieee80211_tx_info *info = status->info;
1087         struct ieee80211_sta *pubsta = status->sta;
1088         struct sk_buff *skb = status->skb;
1089         struct ieee80211_supported_band *sband;
1090         struct sta_info *sta = NULL;
1091         int rates_idx, retry_count;
1092         bool acked, noack_success;
1093         u16 tx_time_est;
1094
1095         if (pubsta) {
1096                 sta = container_of(pubsta, struct sta_info, sta);
1097
1098                 if (status->rate)
1099                         sta->tx_stats.last_rate_info = *status->rate;
1100         }
1101
1102         if (skb && (tx_time_est =
1103                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1104                 /* Do this here to avoid the expensive lookup of the sta
1105                  * in ieee80211_report_used_skb().
1106                  */
1107                 ieee80211_sta_update_pending_airtime(local, sta,
1108                                                      skb_get_queue_mapping(skb),
1109                                                      tx_time_est,
1110                                                      true);
1111                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1112         }
1113
1114         if (!status->info)
1115                 goto free;
1116
1117         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1118
1119         sband = hw->wiphy->bands[info->band];
1120
1121         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1122         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1123
1124         if (pubsta) {
1125                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1126
1127                 if (!acked && !noack_success)
1128                         sta->status_stats.retry_failed++;
1129                 sta->status_stats.retry_count += retry_count;
1130
1131                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1132                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1133                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1134                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1135                                                         acked, info->status.tx_time);
1136
1137                         if (acked) {
1138                                 sta->status_stats.last_ack = jiffies;
1139
1140                                 if (sta->status_stats.lost_packets)
1141                                         sta->status_stats.lost_packets = 0;
1142
1143                                 /* Track when last packet was ACKed */
1144                                 sta->status_stats.last_pkt_time = jiffies;
1145
1146                                 /* Reset connection monitor */
1147                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1148                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1149                                         sdata->u.mgd.probe_send_count = 0;
1150
1151                                 if (info->status.is_valid_ack_signal) {
1152                                         sta->status_stats.last_ack_signal =
1153                                                          (s8)info->status.ack_signal;
1154                                         sta->status_stats.ack_signal_filled = true;
1155                                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
1156                                                             -info->status.ack_signal);
1157                                 }
1158                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1159                                 /*
1160                                  * The STA is in power save mode, so assume
1161                                  * that this TX packet failed because of that.
1162                                  */
1163                                 if (skb)
1164                                         ieee80211_handle_filtered_frame(local, sta, skb);
1165                                 return;
1166                         } else if (noack_success) {
1167                                 /* nothing to do here, do not account as lost */
1168                         } else {
1169                                 ieee80211_lost_packet(sta, info);
1170                         }
1171                 }
1172
1173                 rate_control_tx_status(local, sband, status);
1174                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1175                         ieee80211s_update_metric(local, sta, status);
1176         }
1177
1178         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1179                 return __ieee80211_tx_status(hw, status, rates_idx,
1180                                              retry_count);
1181
1182         if (acked || noack_success) {
1183                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1184                 if (!pubsta)
1185                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1186                 if (retry_count > 0)
1187                         I802_DEBUG_INC(local->dot11RetryCount);
1188                 if (retry_count > 1)
1189                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1190         } else {
1191                 I802_DEBUG_INC(local->dot11FailedCount);
1192         }
1193
1194 free:
1195         if (!skb)
1196                 return;
1197
1198         ieee80211_report_used_skb(local, skb, false);
1199         if (status->free_list)
1200                 list_add_tail(&skb->list, status->free_list);
1201         else
1202                 dev_kfree_skb(skb);
1203 }
1204 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1205
1206 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1207                               struct ieee80211_sta *pubsta,
1208                               struct ieee80211_tx_info *info)
1209 {
1210         struct ieee80211_local *local = hw_to_local(hw);
1211         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1212         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1213         struct ieee80211_tx_status status = {
1214                 .info = info,
1215                 .sta = pubsta,
1216         };
1217
1218         rate_control_tx_status(local, sband, &status);
1219
1220         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1221                 sta->tx_stats.last_rate = info->status.rates[0];
1222 }
1223 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1224
1225 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1226                               struct ieee80211_vif *vif,
1227                               struct sk_buff *skb)
1228 {
1229         struct ieee80211_sub_if_data *sdata;
1230         struct ieee80211_tx_status status = {
1231                 .skb = skb,
1232                 .info = IEEE80211_SKB_CB(skb),
1233         };
1234         struct sta_info *sta;
1235
1236         sdata = vif_to_sdata(vif);
1237
1238         rcu_read_lock();
1239
1240         if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1241                 status.sta = &sta->sta;
1242
1243         ieee80211_tx_status_ext(hw, &status);
1244
1245         rcu_read_unlock();
1246 }
1247 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1248
1249 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1250 {
1251         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1252         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1253                                     num_packets, GFP_ATOMIC);
1254 }
1255 EXPORT_SYMBOL(ieee80211_report_low_ack);
1256
1257 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1258 {
1259         struct ieee80211_local *local = hw_to_local(hw);
1260
1261         ieee80211_report_used_skb(local, skb, true);
1262         dev_kfree_skb_any(skb);
1263 }
1264 EXPORT_SYMBOL(ieee80211_free_txskb);
1265
1266 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1267                               struct sk_buff_head *skbs)
1268 {
1269         struct sk_buff *skb;
1270
1271         while ((skb = __skb_dequeue(skbs)))
1272                 ieee80211_free_txskb(hw, skb);
1273 }