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  * Copyright 2021-2022  Intel Corporation
   9  */
  10
  11 #include <linux/export.h>
  12 #include <linux/etherdevice.h>
  13 #include <net/mac80211.h>
  14 #include <asm/unaligned.h>
  15 #include "ieee80211_i.h"
  16 #include "rate.h"
  17 #include "mesh.h"
  18 #include "led.h"
  19 #include "wme.h"
  20
  21
  22 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  23                                  struct sk_buff *skb)
  24 {
  25         struct ieee80211_local *local = hw_to_local(hw);
  26         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  27         int tmp;
  28
  29         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  30         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  31                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  32         tmp = skb_queue_len(&local->skb_queue) +
  33                 skb_queue_len(&local->skb_queue_unreliable);
  34         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  35                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  36                 ieee80211_free_txskb(hw, skb);
  37                 tmp--;
  38                 I802_DEBUG_INC(local->tx_status_drop);
  39         }
  40         tasklet_schedule(&local->tasklet);
  41 }
  42 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  43
  44 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  45                                             struct sta_info *sta,
  46                                             struct sk_buff *skb)
  47 {
  48         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  49         struct ieee80211_hdr *hdr = (void *)skb->data;
  50         int ac;
  51
  52         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  53                            IEEE80211_TX_CTL_AMPDU |
  54                            IEEE80211_TX_CTL_HW_80211_ENCAP)) {
  55                 ieee80211_free_txskb(&local->hw, skb);
  56                 return;
  57         }
  58
  59         /*
  60          * This skb 'survived' a round-trip through the driver, and
  61          * hopefully the driver didn't mangle it too badly. However,
  62          * we can definitely not rely on the control information
  63          * being correct. Clear it so we don't get junk there, and
  64          * indicate that it needs new processing, but must not be
  65          * modified/encrypted again.
  66          */
  67         memset(&info->control, 0, sizeof(info->control));
  68
  69         info->control.jiffies = jiffies;
  70         info->control.vif = &sta->sdata->vif;
  71         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
  72         info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
  73         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  74
  75         sta->status_stats.filtered++;
  76
  77         /*
  78          * Clear more-data bit on filtered frames, it might be set
  79          * but later frames might time out so it might have to be
  80          * clear again ... It's all rather unlikely (this frame
  81          * should time out first, right?) but let's not confuse
  82          * peers unnecessarily.
  83          */
  84         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  85                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  86
  87         if (ieee80211_is_data_qos(hdr->frame_control)) {
  88                 u8 *p = ieee80211_get_qos_ctl(hdr);
  89                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  90
  91                 /*
  92                  * Clear EOSP if set, this could happen e.g.
  93                  * if an absence period (us being a P2P GO)
  94                  * shortens the SP.
  95                  */
  96                 if (*p & IEEE80211_QOS_CTL_EOSP)
  97                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  98                 ac = ieee80211_ac_from_tid(tid);
  99         } else {
 100                 ac = IEEE80211_AC_BE;
 101         }
 102
 103         /*
 104          * Clear the TX filter mask for this STA when sending the next
 105          * packet. If the STA went to power save mode, this will happen
 106          * when it wakes up for the next time.
 107          */
 108         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 109         ieee80211_clear_fast_xmit(sta);
 110
 111         /*
 112          * This code races in the following way:
 113          *
 114          *  (1) STA sends frame indicating it will go to sleep and does so
 115          *  (2) hardware/firmware adds STA to filter list, passes frame up
 116          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 117          *  (4) we get TX status before having processed the frame and
 118          *      knowing that the STA has gone to sleep.
 119          *
 120          * This is actually quite unlikely even when both those events are
 121          * processed from interrupts coming in quickly after one another or
 122          * even at the same time because we queue both TX status events and
 123          * RX frames to be processed by a tasklet and process them in the
 124          * same order that they were received or TX status last. Hence, there
 125          * is no race as long as the frame RX is processed before the next TX
 126          * status, which drivers can ensure, see below.
 127          *
 128          * Note that this can only happen if the hardware or firmware can
 129          * actually add STAs to the filter list, if this is done by the
 130          * driver in response to set_tim() (which will only reduce the race
 131          * this whole filtering tries to solve, not completely solve it)
 132          * this situation cannot happen.
 133          *
 134          * To completely solve this race drivers need to make sure that they
 135          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 136          *      functions and
 137          *  (b) always process RX events before TX status events if ordering
 138          *      can be unknown, for example with different interrupt status
 139          *      bits.
 140          *  (c) if PS mode transitions are manual (i.e. the flag
 141          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 142          *      changes before calling TX status events if ordering can be
 143          *      unknown.
 144          */
 145         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 146             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 147                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 148                 sta_info_recalc_tim(sta);
 149
 150                 if (!timer_pending(&local->sta_cleanup))
 151                         mod_timer(&local->sta_cleanup,
 152                                   round_jiffies(jiffies +
 153                                                 STA_INFO_CLEANUP_INTERVAL));
 154                 return;
 155         }
 156
 157         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 158             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 159                 /* Software retry the packet once */
 160                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 161                 ieee80211_add_pending_skb(local, skb);
 162                 return;
 163         }
 164
 165         ps_dbg_ratelimited(sta->sdata,
 166                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 167                            skb_queue_len(&sta->tx_filtered[ac]),
 168                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 169         ieee80211_free_txskb(&local->hw, skb);
 170 }
 171
 172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 173 {
 174         struct tid_ampdu_tx *tid_tx;
 175
 176         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 177         if (!tid_tx || !tid_tx->bar_pending)
 178                 return;
 179
 180         tid_tx->bar_pending = false;
 181         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 182 }
 183
 184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 185 {
 186         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 187         struct ieee80211_local *local = sta->local;
 188         struct ieee80211_sub_if_data *sdata = sta->sdata;
 189
 190         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 191                 struct ieee80211_hdr *hdr = (void *) skb->data;
 192                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 193                 u16 tid = qc[0] & 0xf;
 194
 195                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 196         }
 197
 198         if (ieee80211_is_action(mgmt->frame_control) &&
 199             !ieee80211_has_protected(mgmt->frame_control) &&
 200             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 201             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 202             ieee80211_sdata_running(sdata)) {
 203                 enum ieee80211_smps_mode smps_mode;
 204
 205                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 206                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 207                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 208                         break;
 209                 case WLAN_HT_SMPS_CONTROL_STATIC:
 210                         smps_mode = IEEE80211_SMPS_STATIC;
 211                         break;
 212                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 213                 default: /* shouldn't happen since we don't send that */
 214                         smps_mode = IEEE80211_SMPS_OFF;
 215                         break;
 216                 }
 217
 218                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 219                         /*
 220                          * This update looks racy, but isn't -- if we come
 221                          * here we've definitely got a station that we're
 222                          * talking to, and on a managed interface that can
 223                          * only be the AP. And the only other place updating
 224                          * this variable in managed mode is before association.
 225                          */
 226                         sdata->smps_mode = smps_mode;
 227                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 228                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 229                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 230                         sta->known_smps_mode = smps_mode;
 231                 }
 232         }
 233 }
 234
 235 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 236 {
 237         struct tid_ampdu_tx *tid_tx;
 238
 239         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 240         if (!tid_tx)
 241                 return;
 242
 243         tid_tx->failed_bar_ssn = ssn;
 244         tid_tx->bar_pending = true;
 245 }
 246
 247 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 248                                      struct ieee80211_tx_status *status)
 249 {
 250         int len = sizeof(struct ieee80211_radiotap_header);
 251
 252         /* IEEE80211_RADIOTAP_RATE rate */
 253         if (status && status->rate && !(status->rate->flags &
 254                                         (RATE_INFO_FLAGS_MCS |
 255                                          RATE_INFO_FLAGS_DMG |
 256                                          RATE_INFO_FLAGS_EDMG |
 257                                          RATE_INFO_FLAGS_VHT_MCS |
 258                                          RATE_INFO_FLAGS_HE_MCS)))
 259                 len += 2;
 260         else if (info->status.rates[0].idx >= 0 &&
 261                  !(info->status.rates[0].flags &
 262                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 263                 len += 2;
 264
 265         /* IEEE80211_RADIOTAP_TX_FLAGS */
 266         len += 2;
 267
 268         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 269         len += 1;
 270
 271         /* IEEE80211_RADIOTAP_MCS
 272          * IEEE80211_RADIOTAP_VHT */
 273         if (status && status->rate) {
 274                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 275                         len += 3;
 276                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 277                         len = ALIGN(len, 2) + 12;
 278                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 279                         len = ALIGN(len, 2) + 12;
 280         } else if (info->status.rates[0].idx >= 0) {
 281                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 282                         len += 3;
 283                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 284                         len = ALIGN(len, 2) + 12;
 285         }
 286
 287         return len;
 288 }
 289
 290 static void
 291 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 292                                  struct ieee80211_supported_band *sband,
 293                                  struct sk_buff *skb, int retry_count,
 294                                  int rtap_len, int shift,
 295                                  struct ieee80211_tx_status *status)
 296 {
 297         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 298         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 299         struct ieee80211_radiotap_header *rthdr;
 300         unsigned char *pos;
 301         u16 legacy_rate = 0;
 302         u16 txflags;
 303
 304         rthdr = skb_push(skb, rtap_len);
 305
 306         memset(rthdr, 0, rtap_len);
 307         rthdr->it_len = cpu_to_le16(rtap_len);
 308         rthdr->it_present =
 309                 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
 310                             BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
 311         pos = (unsigned char *)(rthdr + 1);
 312
 313         /*
 314          * XXX: Once radiotap gets the bitmap reset thing the vendor
 315          *      extensions proposal contains, we can actually report
 316          *      the whole set of tries we did.
 317          */
 318
 319         /* IEEE80211_RADIOTAP_RATE */
 320
 321         if (status && status->rate) {
 322                 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 323                                              RATE_INFO_FLAGS_DMG |
 324                                              RATE_INFO_FLAGS_EDMG |
 325                                              RATE_INFO_FLAGS_VHT_MCS |
 326                                              RATE_INFO_FLAGS_HE_MCS)))
 327                         legacy_rate = status->rate->legacy;
 328         } else if (info->status.rates[0].idx >= 0 &&
 329                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 330                                                   IEEE80211_TX_RC_VHT_MCS)))
 331                 legacy_rate =
 332                         sband->bitrates[info->status.rates[0].idx].bitrate;
 333
 334         if (legacy_rate) {
 335                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 336                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 337                 /* padding for tx flags */
 338                 pos += 2;
 339         }
 340
 341         /* IEEE80211_RADIOTAP_TX_FLAGS */
 342         txflags = 0;
 343         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 344             !is_multicast_ether_addr(hdr->addr1))
 345                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 346
 347         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 348                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 349         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 350                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 351
 352         put_unaligned_le16(txflags, pos);
 353         pos += 2;
 354
 355         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 356         /* for now report the total retry_count */
 357         *pos = retry_count;
 358         pos++;
 359
 360         if (status && status->rate &&
 361             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 362                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 363                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 364                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 365                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 366                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 367                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 368                 if (status->rate->bw == RATE_INFO_BW_40)
 369                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 370                 pos[2] = status->rate->mcs;
 371                 pos += 3;
 372         } else if (status && status->rate &&
 373                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 374                 u16 known = local->hw.radiotap_vht_details &
 375                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 376                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 377
 378                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 379
 380                 /* required alignment from rthdr */
 381                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 382
 383                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 384                 put_unaligned_le16(known, pos);
 385                 pos += 2;
 386
 387                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 388                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 389                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 390                 pos++;
 391
 392                 /* u8 bandwidth */
 393                 switch (status->rate->bw) {
 394                 case RATE_INFO_BW_160:
 395                         *pos = 11;
 396                         break;
 397                 case RATE_INFO_BW_80:
 398                         *pos = 4;
 399                         break;
 400                 case RATE_INFO_BW_40:
 401                         *pos = 1;
 402                         break;
 403                 default:
 404                         *pos = 0;
 405                         break;
 406                 }
 407                 pos++;
 408
 409                 /* u8 mcs_nss[4] */
 410                 *pos = (status->rate->mcs << 4) | status->rate->nss;
 411                 pos += 4;
 412
 413                 /* u8 coding */
 414                 pos++;
 415                 /* u8 group_id */
 416                 pos++;
 417                 /* u16 partial_aid */
 418                 pos += 2;
 419         } else if (status && status->rate &&
 420                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 421                 struct ieee80211_radiotap_he *he;
 422
 423                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 424
 425                 /* required alignment from rthdr */
 426                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 427                 he = (struct ieee80211_radiotap_he *)pos;
 428
 429                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 430                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 431                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 432                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 433
 434                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 435
 436 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 437
 438                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 439
 440 #define CHECK_GI(s) \
 441         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 442         (int)NL80211_RATE_INFO_HE_GI_##s)
 443
 444                 CHECK_GI(0_8);
 445                 CHECK_GI(1_6);
 446                 CHECK_GI(3_2);
 447
 448                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 449                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 450
 451                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 452
 453                 switch (status->rate->bw) {
 454                 case RATE_INFO_BW_20:
 455                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 456                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 457                         break;
 458                 case RATE_INFO_BW_40:
 459                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 460                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 461                         break;
 462                 case RATE_INFO_BW_80:
 463                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 464                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 465                         break;
 466                 case RATE_INFO_BW_160:
 467                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 468                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 469                         break;
 470                 case RATE_INFO_BW_HE_RU:
 471 #define CHECK_RU_ALLOC(s) \
 472         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 473         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 474
 475                         CHECK_RU_ALLOC(26);
 476                         CHECK_RU_ALLOC(52);
 477                         CHECK_RU_ALLOC(106);
 478                         CHECK_RU_ALLOC(242);
 479                         CHECK_RU_ALLOC(484);
 480                         CHECK_RU_ALLOC(996);
 481                         CHECK_RU_ALLOC(2x996);
 482
 483                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 484                                              status->rate->he_ru_alloc + 4);
 485                         break;
 486                 default:
 487                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 488                 }
 489
 490                 pos += sizeof(struct ieee80211_radiotap_he);
 491         }
 492
 493         if ((status && status->rate) || info->status.rates[0].idx < 0)
 494                 return;
 495
 496         /* IEEE80211_RADIOTAP_MCS
 497          * IEEE80211_RADIOTAP_VHT */
 498         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 499                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 500                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 501                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 502                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 503                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 504                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 505                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 506                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 507                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 508                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 509                 pos[2] = info->status.rates[0].idx;
 510                 pos += 3;
 511         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 512                 u16 known = local->hw.radiotap_vht_details &
 513                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 514                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 515
 516                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 517
 518                 /* required alignment from rthdr */
 519                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 520
 521                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 522                 put_unaligned_le16(known, pos);
 523                 pos += 2;
 524
 525                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 526                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 527                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 528                 pos++;
 529
 530                 /* u8 bandwidth */
 531                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 532                         *pos = 1;
 533                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 534                         *pos = 4;
 535                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 536                         *pos = 11;
 537                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 538                         *pos = 0;
 539                 pos++;
 540
 541                 /* u8 mcs_nss[4] */
 542                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 543                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 544                 pos += 4;
 545
 546                 /* u8 coding */
 547                 pos++;
 548                 /* u8 group_id */
 549                 pos++;
 550                 /* u16 partial_aid */
 551                 pos += 2;
 552         }
 553 }
 554
 555 /*
 556  * Handles the tx for TDLS teardown frames.
 557  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 558  */
 559 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 560                                         struct ieee80211_sub_if_data *sdata,
 561                                         struct sk_buff *skb, u32 flags)
 562 {
 563         struct sk_buff *teardown_skb;
 564         struct sk_buff *orig_teardown_skb;
 565         bool is_teardown = false;
 566
 567         /* Get the teardown data we need and free the lock */
 568         spin_lock(&sdata->u.mgd.teardown_lock);
 569         teardown_skb = sdata->u.mgd.teardown_skb;
 570         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 571         if ((skb == orig_teardown_skb) && teardown_skb) {
 572                 sdata->u.mgd.teardown_skb = NULL;
 573                 sdata->u.mgd.orig_teardown_skb = NULL;
 574                 is_teardown = true;
 575         }
 576         spin_unlock(&sdata->u.mgd.teardown_lock);
 577
 578         if (is_teardown) {
 579                 /* This mechanism relies on being able to get ACKs */
 580                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 581
 582                 /* Check if peer has ACKed */
 583                 if (flags & IEEE80211_TX_STAT_ACK) {
 584                         dev_kfree_skb_any(teardown_skb);
 585                 } else {
 586                         tdls_dbg(sdata,
 587                                  "TDLS Resending teardown through AP\n");
 588
 589                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 590                 }
 591         }
 592 }
 593
 594 static struct ieee80211_sub_if_data *
 595 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 596 {
 597         struct ieee80211_sub_if_data *sdata;
 598
 599         if (skb->dev) {
 600                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 601                         if (!sdata->dev)
 602                                 continue;
 603
 604                         if (skb->dev == sdata->dev)
 605                                 return sdata;
 606                 }
 607
 608                 return NULL;
 609         }
 610
 611         return rcu_dereference(local->p2p_sdata);
 612 }
 613
 614 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 615                                      struct ieee80211_tx_info *info,
 616                                      bool acked, bool dropped)
 617 {
 618         struct sk_buff *skb;
 619         unsigned long flags;
 620
 621         spin_lock_irqsave(&local->ack_status_lock, flags);
 622         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 623         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 624
 625         if (!skb)
 626                 return;
 627
 628         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 629                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 630                 struct ieee80211_sub_if_data *sdata;
 631                 struct ieee80211_hdr *hdr = (void *)skb->data;
 632                 bool is_valid_ack_signal =
 633                         !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
 634
 635                 rcu_read_lock();
 636                 sdata = ieee80211_sdata_from_skb(local, skb);
 637                 if (sdata) {
 638                         if (skb->protocol == sdata->control_port_protocol ||
 639                             skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
 640                                 cfg80211_control_port_tx_status(&sdata->wdev,
 641                                                                 cookie,
 642                                                                 skb->data,
 643                                                                 skb->len,
 644                                                                 acked,
 645                                                                 GFP_ATOMIC);
 646                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 647                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 648                                                       cookie, acked,
 649                                                       info->status.ack_signal,
 650                                                       is_valid_ack_signal,
 651                                                       GFP_ATOMIC);
 652                         else if (ieee80211_is_mgmt(hdr->frame_control))
 653                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 654                                                         skb->data, skb->len,
 655                                                         acked, GFP_ATOMIC);
 656                         else
 657                                 pr_warn("Unknown status report in ack skb\n");
 658
 659                 }
 660                 rcu_read_unlock();
 661
 662                 dev_kfree_skb_any(skb);
 663         } else if (dropped) {
 664                 dev_kfree_skb_any(skb);
 665         } else {
 666                 /* consumes skb */
 667                 skb_complete_wifi_ack(skb, acked);
 668         }
 669 }
 670
 671 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 672                                       struct sk_buff *skb, bool dropped)
 673 {
 674         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 675         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 676         struct ieee80211_hdr *hdr = (void *)skb->data;
 677         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 678
 679         if (dropped)
 680                 acked = false;
 681
 682         if (tx_time_est) {
 683                 struct sta_info *sta;
 684
 685                 rcu_read_lock();
 686
 687                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 688                 ieee80211_sta_update_pending_airtime(local, sta,
 689                                                      skb_get_queue_mapping(skb),
 690                                                      tx_time_est,
 691                                                      true);
 692                 rcu_read_unlock();
 693         }
 694
 695         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 696                 struct ieee80211_sub_if_data *sdata;
 697
 698                 rcu_read_lock();
 699
 700                 sdata = ieee80211_sdata_from_skb(local, skb);
 701
 702                 if (!sdata) {
 703                         skb->dev = NULL;
 704                 } else {
 705                         unsigned int hdr_size =
 706                                 ieee80211_hdrlen(hdr->frame_control);
 707
 708                         /* Check to see if packet is a TDLS teardown packet */
 709                         if (ieee80211_is_data(hdr->frame_control) &&
 710                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 711                              WLAN_TDLS_TEARDOWN)) {
 712                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 713                                                             info->flags);
 714                         } else if (ieee80211_s1g_is_twt_setup(skb)) {
 715                                 if (!acked) {
 716                                         struct sk_buff *qskb;
 717
 718                                         qskb = skb_clone(skb, GFP_ATOMIC);
 719                                         if (qskb) {
 720                                                 skb_queue_tail(&sdata->status_queue,
 721                                                                qskb);
 722                                                 ieee80211_queue_work(&local->hw,
 723                                                                      &sdata->work);
 724                                         }
 725                                 }
 726                         } else {
 727                                 ieee80211_mgd_conn_tx_status(sdata,
 728                                                              hdr->frame_control,
 729                                                              acked);
 730                         }
 731                 }
 732
 733                 rcu_read_unlock();
 734         } else if (info->ack_frame_id) {
 735                 ieee80211_report_ack_skb(local, info, acked, dropped);
 736         }
 737
 738         if (!dropped && skb->destructor) {
 739                 skb->wifi_acked_valid = 1;
 740                 skb->wifi_acked = acked;
 741         }
 742
 743         ieee80211_led_tx(local);
 744
 745         if (skb_has_frag_list(skb)) {
 746                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 747                 skb_shinfo(skb)->frag_list = NULL;
 748         }
 749 }
 750
 751 /*
 752  * Use a static threshold for now, best value to be determined
 753  * by testing ...
 754  * Should it depend on:
 755  *  - on # of retransmissions
 756  *  - current throughput (higher value for higher tpt)?
 757  */
 758 #define STA_LOST_PKT_THRESHOLD  50
 759 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 760 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 761
 762 static void ieee80211_lost_packet(struct sta_info *sta,
 763                                   struct ieee80211_tx_info *info)
 764 {
 765         unsigned long pkt_time = STA_LOST_PKT_TIME;
 766         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 767
 768         /* If driver relies on its own algorithm for station kickout, skip
 769          * mac80211 packet loss mechanism.
 770          */
 771         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 772                 return;
 773
 774         /* This packet was aggregated but doesn't carry status info */
 775         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 776             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 777                 return;
 778
 779         sta->status_stats.lost_packets++;
 780         if (sta->sta.tdls) {
 781                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 782                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 783         }
 784
 785         /*
 786          * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
 787          * of the last packets were lost, and that no ACK was received in the
 788          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 789          * mechanism.
 790          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 791          */
 792         if (sta->status_stats.lost_packets < pkt_thr ||
 793             !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
 794                 return;
 795
 796         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 797                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 798         sta->status_stats.lost_packets = 0;
 799 }
 800
 801 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 802                                   struct ieee80211_tx_info *info,
 803                                   int *retry_count)
 804 {
 805         int count = -1;
 806         int i;
 807
 808         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 809                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 810                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 811                         /* just the first aggr frame carry status info */
 812                         info->status.rates[i].idx = -1;
 813                         info->status.rates[i].count = 0;
 814                         break;
 815                 } else if (info->status.rates[i].idx < 0) {
 816                         break;
 817                 } else if (i >= hw->max_report_rates) {
 818                         /* the HW cannot have attempted that rate */
 819                         info->status.rates[i].idx = -1;
 820                         info->status.rates[i].count = 0;
 821                         break;
 822                 }
 823
 824                 count += info->status.rates[i].count;
 825         }
 826
 827         if (count < 0)
 828                 count = 0;
 829
 830         *retry_count = count;
 831         return i - 1;
 832 }
 833
 834 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 835                           struct ieee80211_supported_band *sband,
 836                           int retry_count, int shift, bool send_to_cooked,
 837                           struct ieee80211_tx_status *status)
 838 {
 839         struct sk_buff *skb2;
 840         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 841         struct ieee80211_sub_if_data *sdata;
 842         struct net_device *prev_dev = NULL;
 843         int rtap_len;
 844
 845         /* send frame to monitor interfaces now */
 846         rtap_len = ieee80211_tx_radiotap_len(info, status);
 847         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 848                 pr_err("ieee80211_tx_status: headroom too small\n");
 849                 dev_kfree_skb(skb);
 850                 return;
 851         }
 852         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 853                                          rtap_len, shift, status);
 854
 855         /* XXX: is this sufficient for BPF? */
 856         skb_reset_mac_header(skb);
 857         skb->ip_summed = CHECKSUM_UNNECESSARY;
 858         skb->pkt_type = PACKET_OTHERHOST;
 859         skb->protocol = htons(ETH_P_802_2);
 860         memset(skb->cb, 0, sizeof(skb->cb));
 861
 862         rcu_read_lock();
 863         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 864                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 865                         if (!ieee80211_sdata_running(sdata))
 866                                 continue;
 867
 868                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 869                             !send_to_cooked)
 870                                 continue;
 871
 872                         if (prev_dev) {
 873                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 874                                 if (skb2) {
 875                                         skb2->dev = prev_dev;
 876                                         netif_rx(skb2);
 877                                 }
 878                         }
 879
 880                         prev_dev = sdata->dev;
 881                 }
 882         }
 883         if (prev_dev) {
 884                 skb->dev = prev_dev;
 885                 netif_rx(skb);
 886                 skb = NULL;
 887         }
 888         rcu_read_unlock();
 889         dev_kfree_skb(skb);
 890 }
 891
 892 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 893                                   struct ieee80211_tx_status *status,
 894                                   int rates_idx, int retry_count)
 895 {
 896         struct sk_buff *skb = status->skb;
 897         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 898         struct ieee80211_local *local = hw_to_local(hw);
 899         struct ieee80211_tx_info *info = status->info;
 900         struct sta_info *sta;
 901         __le16 fc;
 902         struct ieee80211_supported_band *sband;
 903         bool send_to_cooked;
 904         bool acked;
 905         bool noack_success;
 906         struct ieee80211_bar *bar;
 907         int shift = 0;
 908         int tid = IEEE80211_NUM_TIDS;
 909
 910         sband = local->hw.wiphy->bands[info->band];
 911         fc = hdr->frame_control;
 912
 913         if (status->sta) {
 914                 sta = container_of(status->sta, struct sta_info, sta);
 915                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 916
 917                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 918                         clear_sta_flag(sta, WLAN_STA_SP);
 919
 920                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 921                 noack_success = !!(info->flags &
 922                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 923
 924                 /* mesh Peer Service Period support */
 925                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 926                     ieee80211_is_data_qos(fc))
 927                         ieee80211_mpsp_trigger_process(
 928                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 929
 930                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 931                     (ieee80211_is_data(hdr->frame_control)) &&
 932                     (rates_idx != -1))
 933                         sta->tx_stats.last_rate =
 934                                 info->status.rates[rates_idx];
 935
 936                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 937                     (ieee80211_is_data_qos(fc))) {
 938                         u16 ssn;
 939                         u8 *qc;
 940
 941                         qc = ieee80211_get_qos_ctl(hdr);
 942                         tid = qc[0] & 0xf;
 943                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 944                                                 & IEEE80211_SCTL_SEQ);
 945                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 946                                            tid, ssn);
 947                 } else if (ieee80211_is_data_qos(fc)) {
 948                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 949
 950                         tid = qc[0] & 0xf;
 951                 }
 952
 953                 if (!acked && ieee80211_is_back_req(fc)) {
 954                         u16 control;
 955
 956                         /*
 957                          * BAR failed, store the last SSN and retry sending
 958                          * the BAR when the next unicast transmission on the
 959                          * same TID succeeds.
 960                          */
 961                         bar = (struct ieee80211_bar *) skb->data;
 962                         control = le16_to_cpu(bar->control);
 963                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 964                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 965
 966                                 tid = (control &
 967                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 968                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 969
 970                                 ieee80211_set_bar_pending(sta, tid, ssn);
 971                         }
 972                 }
 973
 974                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 975                         ieee80211_handle_filtered_frame(local, sta, skb);
 976                         return;
 977                 } else if (ieee80211_is_data_present(fc)) {
 978                         if (!acked && !noack_success)
 979                                 sta->status_stats.msdu_failed[tid]++;
 980
 981                         sta->status_stats.msdu_retries[tid] +=
 982                                 retry_count;
 983                 }
 984
 985                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 986                         ieee80211_frame_acked(sta, skb);
 987
 988         } else if (wiphy_ext_feature_isset(local->hw.wiphy,
 989                                            NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) {
 990                 struct ieee80211_sub_if_data *sdata;
 991                 struct ieee80211_txq *txq;
 992                 u32 airtime;
 993
 994                 /* Account airtime to multicast queue */
 995                 sdata = ieee80211_sdata_from_skb(local, skb);
 996
 997                 if (sdata && (txq = sdata->vif.txq)) {
 998                         airtime = info->status.tx_time ?:
 999                                 ieee80211_calc_expected_tx_airtime(hw,
1000                                                                    &sdata->vif,
1001                                                                    NULL,
1002                                                                    skb->len,
1003                                                                    false);
1004
1005                         ieee80211_register_airtime(txq, airtime, 0);
1006                 }
1007         }
1008
1009         /* SNMP counters
1010          * Fragments are passed to low-level drivers as separate skbs, so these
1011          * are actually fragments, not frames. Update frame counters only for
1012          * the first fragment of the frame. */
1013         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1014             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1015                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1016                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1017                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1018                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1019                         if (retry_count > 0)
1020                                 I802_DEBUG_INC(local->dot11RetryCount);
1021                         if (retry_count > 1)
1022                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1023                 }
1024
1025                 /* This counter shall be incremented for an acknowledged MPDU
1026                  * with an individual address in the address 1 field or an MPDU
1027                  * with a multicast address in the address 1 field of type Data
1028                  * or Management. */
1029                 if (!is_multicast_ether_addr(hdr->addr1) ||
1030                     ieee80211_is_data(fc) ||
1031                     ieee80211_is_mgmt(fc))
1032                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1033         } else {
1034                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1035                         I802_DEBUG_INC(local->dot11FailedCount);
1036         }
1037
1038         if (ieee80211_is_any_nullfunc(fc) &&
1039             ieee80211_has_pm(fc) &&
1040             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1041             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1042             local->ps_sdata && !(local->scanning)) {
1043                 if (info->flags & IEEE80211_TX_STAT_ACK)
1044                         local->ps_sdata->u.mgd.flags |=
1045                                         IEEE80211_STA_NULLFUNC_ACKED;
1046                 mod_timer(&local->dynamic_ps_timer,
1047                           jiffies + msecs_to_jiffies(10));
1048         }
1049
1050         ieee80211_report_used_skb(local, skb, false);
1051
1052         /* this was a transmitted frame, but now we want to reuse it */
1053         skb_orphan(skb);
1054
1055         /* Need to make a copy before skb->cb gets cleared */
1056         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1057                          !(ieee80211_is_data(fc));
1058
1059         /*
1060          * This is a bit racy but we can avoid a lot of work
1061          * with this test...
1062          */
1063         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1064                 if (status->free_list)
1065                         list_add_tail(&skb->list, status->free_list);
1066                 else
1067                         dev_kfree_skb(skb);
1068                 return;
1069         }
1070
1071         /* send to monitor interfaces */
1072         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1073                              send_to_cooked, status);
1074 }
1075
1076 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1077 {
1078         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1079         struct ieee80211_local *local = hw_to_local(hw);
1080         struct ieee80211_tx_status status = {
1081                 .skb = skb,
1082                 .info = IEEE80211_SKB_CB(skb),
1083         };
1084         struct sta_info *sta;
1085
1086         rcu_read_lock();
1087
1088         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1089         if (sta)
1090                 status.sta = &sta->sta;
1091
1092         ieee80211_tx_status_ext(hw, &status);
1093         rcu_read_unlock();
1094 }
1095 EXPORT_SYMBOL(ieee80211_tx_status);
1096
1097 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1098                              struct ieee80211_tx_status *status)
1099 {
1100         struct ieee80211_local *local = hw_to_local(hw);
1101         struct ieee80211_tx_info *info = status->info;
1102         struct ieee80211_sta *pubsta = status->sta;
1103         struct sk_buff *skb = status->skb;
1104         struct ieee80211_supported_band *sband;
1105         struct sta_info *sta = NULL;
1106         int rates_idx, retry_count;
1107         bool acked, noack_success, ack_signal_valid;
1108         u16 tx_time_est;
1109
1110         if (pubsta) {
1111                 sta = container_of(pubsta, struct sta_info, sta);
1112
1113                 if (status->rate)
1114                         sta->tx_stats.last_rate_info = *status->rate;
1115         }
1116
1117         if (skb && (tx_time_est =
1118                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1119                 /* Do this here to avoid the expensive lookup of the sta
1120                  * in ieee80211_report_used_skb().
1121                  */
1122                 ieee80211_sta_update_pending_airtime(local, sta,
1123                                                      skb_get_queue_mapping(skb),
1124                                                      tx_time_est,
1125                                                      true);
1126                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1127         }
1128
1129         if (!status->info)
1130                 goto free;
1131
1132         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1133
1134         sband = hw->wiphy->bands[info->band];
1135
1136         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1137         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1138         ack_signal_valid =
1139                 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1140
1141         if (pubsta) {
1142                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1143
1144                 if (!acked && !noack_success)
1145                         sta->status_stats.retry_failed++;
1146                 sta->status_stats.retry_count += retry_count;
1147
1148                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1149                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1150                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1151                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1152                                                         acked, info->status.tx_time);
1153
1154                         if (acked) {
1155                                 sta->status_stats.last_ack = jiffies;
1156
1157                                 if (sta->status_stats.lost_packets)
1158                                         sta->status_stats.lost_packets = 0;
1159
1160                                 /* Track when last packet was ACKed */
1161                                 sta->status_stats.last_pkt_time = jiffies;
1162
1163                                 /* Reset connection monitor */
1164                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1165                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1166                                         sdata->u.mgd.probe_send_count = 0;
1167
1168                                 if (ack_signal_valid) {
1169                                         sta->status_stats.last_ack_signal =
1170                                                          (s8)info->status.ack_signal;
1171                                         sta->status_stats.ack_signal_filled = true;
1172                                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
1173                                                             -info->status.ack_signal);
1174                                 }
1175                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1176                                 /*
1177                                  * The STA is in power save mode, so assume
1178                                  * that this TX packet failed because of that.
1179                                  */
1180                                 if (skb)
1181                                         ieee80211_handle_filtered_frame(local, sta, skb);
1182                                 return;
1183                         } else if (noack_success) {
1184                                 /* nothing to do here, do not account as lost */
1185                         } else {
1186                                 ieee80211_lost_packet(sta, info);
1187                         }
1188                 }
1189
1190                 rate_control_tx_status(local, sband, status);
1191                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1192                         ieee80211s_update_metric(local, sta, status);
1193         }
1194
1195         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1196                 return __ieee80211_tx_status(hw, status, rates_idx,
1197                                              retry_count);
1198
1199         if (acked || noack_success) {
1200                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1201                 if (!pubsta)
1202                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1203                 if (retry_count > 0)
1204                         I802_DEBUG_INC(local->dot11RetryCount);
1205                 if (retry_count > 1)
1206                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1207         } else {
1208                 I802_DEBUG_INC(local->dot11FailedCount);
1209         }
1210
1211 free:
1212         if (!skb)
1213                 return;
1214
1215         ieee80211_report_used_skb(local, skb, false);
1216         if (status->free_list)
1217                 list_add_tail(&skb->list, status->free_list);
1218         else
1219                 dev_kfree_skb(skb);
1220 }
1221 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1222
1223 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1224                               struct ieee80211_sta *pubsta,
1225                               struct ieee80211_tx_info *info)
1226 {
1227         struct ieee80211_local *local = hw_to_local(hw);
1228         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1229         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1230         struct ieee80211_tx_status status = {
1231                 .info = info,
1232                 .sta = pubsta,
1233         };
1234
1235         rate_control_tx_status(local, sband, &status);
1236
1237         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1238                 sta->tx_stats.last_rate = info->status.rates[0];
1239 }
1240 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1241
1242 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1243                               struct ieee80211_vif *vif,
1244                               struct sk_buff *skb)
1245 {
1246         struct ieee80211_sub_if_data *sdata;
1247         struct ieee80211_tx_status status = {
1248                 .skb = skb,
1249                 .info = IEEE80211_SKB_CB(skb),
1250         };
1251         struct sta_info *sta;
1252
1253         sdata = vif_to_sdata(vif);
1254
1255         rcu_read_lock();
1256
1257         if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1258                 status.sta = &sta->sta;
1259
1260         ieee80211_tx_status_ext(hw, &status);
1261
1262         rcu_read_unlock();
1263 }
1264 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1265
1266 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1267 {
1268         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1269         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1270                                     num_packets, GFP_ATOMIC);
1271 }
1272 EXPORT_SYMBOL(ieee80211_report_low_ack);
1273
1274 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1275 {
1276         struct ieee80211_local *local = hw_to_local(hw);
1277
1278         ieee80211_report_used_skb(local, skb, true);
1279         dev_kfree_skb_any(skb);
1280 }
1281 EXPORT_SYMBOL(ieee80211_free_txskb);
1282
1283 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1284                               struct sk_buff_head *skbs)
1285 {
1286         struct sk_buff *skb;
1287
1288         while ((skb = __skb_dequeue(skbs)))
1289                 ieee80211_free_txskb(hw, skb);
1290 }