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 2021-2023  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->deflink.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
 188         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 189                 struct ieee80211_hdr *hdr = (void *) skb->data;
 190                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 191                 u16 tid = qc[0] & 0xf;
 192
 193                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 194         }
 195 }
 196
 197 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 198 {
 199         struct tid_ampdu_tx *tid_tx;
 200
 201         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 202         if (!tid_tx)
 203                 return;
 204
 205         tid_tx->failed_bar_ssn = ssn;
 206         tid_tx->bar_pending = true;
 207 }
 208
 209 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 210                                      struct ieee80211_tx_status *status)
 211 {
 212         struct ieee80211_rate_status *status_rate = NULL;
 213         int len = sizeof(struct ieee80211_radiotap_header);
 214
 215         if (status && status->n_rates)
 216                 status_rate = &status->rates[status->n_rates - 1];
 217
 218         /* IEEE80211_RADIOTAP_RATE rate */
 219         if (status_rate && !(status_rate->rate_idx.flags &
 220                                                 (RATE_INFO_FLAGS_MCS |
 221                                                  RATE_INFO_FLAGS_DMG |
 222                                                  RATE_INFO_FLAGS_EDMG |
 223                                                  RATE_INFO_FLAGS_VHT_MCS |
 224                                                  RATE_INFO_FLAGS_HE_MCS)))
 225                 len += 2;
 226         else if (info->status.rates[0].idx >= 0 &&
 227                  !(info->status.rates[0].flags &
 228                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 229                 len += 2;
 230
 231         /* IEEE80211_RADIOTAP_TX_FLAGS */
 232         len += 2;
 233
 234         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 235         len += 1;
 236
 237         /* IEEE80211_RADIOTAP_MCS
 238          * IEEE80211_RADIOTAP_VHT */
 239         if (status_rate) {
 240                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS)
 241                         len += 3;
 242                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS)
 243                         len = ALIGN(len, 2) + 12;
 244                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_HE_MCS)
 245                         len = ALIGN(len, 2) + 12;
 246         } else if (info->status.rates[0].idx >= 0) {
 247                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 248                         len += 3;
 249                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 250                         len = ALIGN(len, 2) + 12;
 251         }
 252
 253         return len;
 254 }
 255
 256 static void
 257 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 258                                  struct sk_buff *skb, int retry_count,
 259                                  int rtap_len,
 260                                  struct ieee80211_tx_status *status)
 261 {
 262         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 263         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 264         struct ieee80211_radiotap_header *rthdr;
 265         struct ieee80211_rate_status *status_rate = NULL;
 266         unsigned char *pos;
 267         u16 legacy_rate = 0;
 268         u16 txflags;
 269
 270         if (status && status->n_rates)
 271                 status_rate = &status->rates[status->n_rates - 1];
 272
 273         rthdr = skb_push(skb, rtap_len);
 274
 275         memset(rthdr, 0, rtap_len);
 276         rthdr->it_len = cpu_to_le16(rtap_len);
 277         rthdr->it_present =
 278                 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
 279                             BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
 280         pos = (unsigned char *)(rthdr + 1);
 281
 282         /*
 283          * XXX: Once radiotap gets the bitmap reset thing the vendor
 284          *      extensions proposal contains, we can actually report
 285          *      the whole set of tries we did.
 286          */
 287
 288         /* IEEE80211_RADIOTAP_RATE */
 289
 290         if (status_rate) {
 291                 if (!(status_rate->rate_idx.flags &
 292                                                 (RATE_INFO_FLAGS_MCS |
 293                                                  RATE_INFO_FLAGS_DMG |
 294                                                  RATE_INFO_FLAGS_EDMG |
 295                                                  RATE_INFO_FLAGS_VHT_MCS |
 296                                                  RATE_INFO_FLAGS_HE_MCS)))
 297                         legacy_rate = status_rate->rate_idx.legacy;
 298         } else if (info->status.rates[0].idx >= 0 &&
 299                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 300                                                   IEEE80211_TX_RC_VHT_MCS))) {
 301                 struct ieee80211_supported_band *sband;
 302
 303                 sband = local->hw.wiphy->bands[info->band];
 304                 legacy_rate =
 305                         sband->bitrates[info->status.rates[0].idx].bitrate;
 306         }
 307
 308         if (legacy_rate) {
 309                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 310                 *pos = DIV_ROUND_UP(legacy_rate, 5);
 311                 /* padding for tx flags */
 312                 pos += 2;
 313         }
 314
 315         /* IEEE80211_RADIOTAP_TX_FLAGS */
 316         txflags = 0;
 317         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 318             !is_multicast_ether_addr(hdr->addr1))
 319                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 320
 321         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 322                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 323         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 324                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 325
 326         put_unaligned_le16(txflags, pos);
 327         pos += 2;
 328
 329         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 330         /* for now report the total retry_count */
 331         *pos = retry_count;
 332         pos++;
 333
 334         if (status_rate && (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS))
 335         {
 336                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 337                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 338                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 339                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 340                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 341                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 342                 if (status_rate->rate_idx.bw == RATE_INFO_BW_40)
 343                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 344                 pos[2] = status_rate->rate_idx.mcs;
 345                 pos += 3;
 346         } else if (status_rate && (status_rate->rate_idx.flags &
 347                                         RATE_INFO_FLAGS_VHT_MCS))
 348         {
 349                 u16 known = local->hw.radiotap_vht_details &
 350                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 351                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 352
 353                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 354
 355                 /* required alignment from rthdr */
 356                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 357
 358                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 359                 put_unaligned_le16(known, pos);
 360                 pos += 2;
 361
 362                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 363                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 364                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 365                 pos++;
 366
 367                 /* u8 bandwidth */
 368                 switch (status_rate->rate_idx.bw) {
 369                 case RATE_INFO_BW_160:
 370                         *pos = 11;
 371                         break;
 372                 case RATE_INFO_BW_80:
 373                         *pos = 4;
 374                         break;
 375                 case RATE_INFO_BW_40:
 376                         *pos = 1;
 377                         break;
 378                 default:
 379                         *pos = 0;
 380                         break;
 381                 }
 382                 pos++;
 383
 384                 /* u8 mcs_nss[4] */
 385                 *pos = (status_rate->rate_idx.mcs << 4) |
 386                                 status_rate->rate_idx.nss;
 387                 pos += 4;
 388
 389                 /* u8 coding */
 390                 pos++;
 391                 /* u8 group_id */
 392                 pos++;
 393                 /* u16 partial_aid */
 394                 pos += 2;
 395         } else if (status_rate && (status_rate->rate_idx.flags &
 396                                         RATE_INFO_FLAGS_HE_MCS))
 397         {
 398                 struct ieee80211_radiotap_he *he;
 399
 400                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 401
 402                 /* required alignment from rthdr */
 403                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 404                 he = (struct ieee80211_radiotap_he *)pos;
 405
 406                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 407                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 408                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 409                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 410
 411                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 412
 413 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 414
 415                 he->data6 |= HE_PREP(DATA6_NSTS, status_rate->rate_idx.nss);
 416
 417 #define CHECK_GI(s) \
 418         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 419         (int)NL80211_RATE_INFO_HE_GI_##s)
 420
 421                 CHECK_GI(0_8);
 422                 CHECK_GI(1_6);
 423                 CHECK_GI(3_2);
 424
 425                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status_rate->rate_idx.mcs);
 426                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status_rate->rate_idx.he_dcm);
 427
 428                 he->data5 |= HE_PREP(DATA5_GI, status_rate->rate_idx.he_gi);
 429
 430                 switch (status_rate->rate_idx.bw) {
 431                 case RATE_INFO_BW_20:
 432                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 433                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 434                         break;
 435                 case RATE_INFO_BW_40:
 436                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 437                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 438                         break;
 439                 case RATE_INFO_BW_80:
 440                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 441                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 442                         break;
 443                 case RATE_INFO_BW_160:
 444                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 445                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 446                         break;
 447                 case RATE_INFO_BW_HE_RU:
 448 #define CHECK_RU_ALLOC(s) \
 449         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 450         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 451
 452                         CHECK_RU_ALLOC(26);
 453                         CHECK_RU_ALLOC(52);
 454                         CHECK_RU_ALLOC(106);
 455                         CHECK_RU_ALLOC(242);
 456                         CHECK_RU_ALLOC(484);
 457                         CHECK_RU_ALLOC(996);
 458                         CHECK_RU_ALLOC(2x996);
 459
 460                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 461                                              status_rate->rate_idx.he_ru_alloc + 4);
 462                         break;
 463                 default:
 464                         WARN_ONCE(1, "Invalid SU BW %d\n", status_rate->rate_idx.bw);
 465                 }
 466
 467                 pos += sizeof(struct ieee80211_radiotap_he);
 468         }
 469
 470         if (status_rate || info->status.rates[0].idx < 0)
 471                 return;
 472
 473         /* IEEE80211_RADIOTAP_MCS
 474          * IEEE80211_RADIOTAP_VHT */
 475         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 476                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 477                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 478                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 479                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 480                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 481                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 482                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 483                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 484                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 485                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 486                 pos[2] = info->status.rates[0].idx;
 487                 pos += 3;
 488         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 489                 u16 known = local->hw.radiotap_vht_details &
 490                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 491                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 492
 493                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 494
 495                 /* required alignment from rthdr */
 496                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 497
 498                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 499                 put_unaligned_le16(known, pos);
 500                 pos += 2;
 501
 502                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 503                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 504                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 505                 pos++;
 506
 507                 /* u8 bandwidth */
 508                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 509                         *pos = 1;
 510                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 511                         *pos = 4;
 512                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 513                         *pos = 11;
 514                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 515                         *pos = 0;
 516                 pos++;
 517
 518                 /* u8 mcs_nss[4] */
 519                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 520                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 521                 pos += 4;
 522
 523                 /* u8 coding */
 524                 pos++;
 525                 /* u8 group_id */
 526                 pos++;
 527                 /* u16 partial_aid */
 528                 pos += 2;
 529         }
 530 }
 531
 532 /*
 533  * Handles the tx for TDLS teardown frames.
 534  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 535  */
 536 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 537                                         struct ieee80211_sub_if_data *sdata,
 538                                         struct sk_buff *skb, u32 flags)
 539 {
 540         struct sk_buff *teardown_skb;
 541         struct sk_buff *orig_teardown_skb;
 542         bool is_teardown = false;
 543
 544         /* Get the teardown data we need and free the lock */
 545         spin_lock(&sdata->u.mgd.teardown_lock);
 546         teardown_skb = sdata->u.mgd.teardown_skb;
 547         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 548         if ((skb == orig_teardown_skb) && teardown_skb) {
 549                 sdata->u.mgd.teardown_skb = NULL;
 550                 sdata->u.mgd.orig_teardown_skb = NULL;
 551                 is_teardown = true;
 552         }
 553         spin_unlock(&sdata->u.mgd.teardown_lock);
 554
 555         if (is_teardown) {
 556                 /* This mechanism relies on being able to get ACKs */
 557                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 558
 559                 /* Check if peer has ACKed */
 560                 if (flags & IEEE80211_TX_STAT_ACK) {
 561                         dev_kfree_skb_any(teardown_skb);
 562                 } else {
 563                         tdls_dbg(sdata,
 564                                  "TDLS Resending teardown through AP\n");
 565
 566                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 567                 }
 568         }
 569 }
 570
 571 static struct ieee80211_sub_if_data *
 572 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 573 {
 574         struct ieee80211_sub_if_data *sdata;
 575
 576         if (skb->dev) {
 577                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 578                         if (!sdata->dev)
 579                                 continue;
 580
 581                         if (skb->dev == sdata->dev)
 582                                 return sdata;
 583                 }
 584
 585                 return NULL;
 586         }
 587
 588         return rcu_dereference(local->p2p_sdata);
 589 }
 590
 591 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 592                                      struct sk_buff *orig_skb,
 593                                      bool acked, bool dropped,
 594                                      ktime_t ack_hwtstamp)
 595 {
 596         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(orig_skb);
 597         struct sk_buff *skb;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&local->ack_status_lock, flags);
 601         skb = idr_remove(&local->ack_status_frames, info->status_data);
 602         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 603
 604         if (!skb)
 605                 return;
 606
 607         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 608                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 609                 struct ieee80211_sub_if_data *sdata;
 610                 struct ieee80211_hdr *hdr = (void *)skb->data;
 611                 bool is_valid_ack_signal =
 612                         !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
 613                 struct cfg80211_tx_status status = {
 614                         .cookie = cookie,
 615                         .buf = skb->data,
 616                         .len = skb->len,
 617                         .ack = acked,
 618                 };
 619
 620                 if (ieee80211_is_timing_measurement(orig_skb) ||
 621                     ieee80211_is_ftm(orig_skb)) {
 622                         status.tx_tstamp =
 623                                 ktime_to_ns(skb_hwtstamps(orig_skb)->hwtstamp);
 624                         status.ack_tstamp = ktime_to_ns(ack_hwtstamp);
 625                 }
 626
 627                 rcu_read_lock();
 628                 sdata = ieee80211_sdata_from_skb(local, skb);
 629                 if (sdata) {
 630                         if (skb->protocol == sdata->control_port_protocol ||
 631                             skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
 632                                 cfg80211_control_port_tx_status(&sdata->wdev,
 633                                                                 cookie,
 634                                                                 skb->data,
 635                                                                 skb->len,
 636                                                                 acked,
 637                                                                 GFP_ATOMIC);
 638                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 639                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 640                                                       cookie, acked,
 641                                                       info->status.ack_signal,
 642                                                       is_valid_ack_signal,
 643                                                       GFP_ATOMIC);
 644                         else if (ieee80211_is_mgmt(hdr->frame_control))
 645                                 cfg80211_mgmt_tx_status_ext(&sdata->wdev,
 646                                                             &status,
 647                                                             GFP_ATOMIC);
 648                         else
 649                                 pr_warn("Unknown status report in ack skb\n");
 650
 651                 }
 652                 rcu_read_unlock();
 653
 654                 dev_kfree_skb_any(skb);
 655         } else if (dropped) {
 656                 dev_kfree_skb_any(skb);
 657         } else {
 658                 /* consumes skb */
 659                 skb_complete_wifi_ack(skb, acked);
 660         }
 661 }
 662
 663 static void ieee80211_handle_smps_status(struct ieee80211_sub_if_data *sdata,
 664                                          bool acked, u16 status_data)
 665 {
 666         u16 sub_data = u16_get_bits(status_data, IEEE80211_STATUS_SUBDATA_MASK);
 667         enum ieee80211_smps_mode smps_mode = sub_data & 3;
 668         int link_id = (sub_data >> 2);
 669         struct ieee80211_link_data *link;
 670
 671         if (!sdata || !ieee80211_sdata_running(sdata))
 672                 return;
 673
 674         if (!acked)
 675                 return;
 676
 677         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 678                 return;
 679
 680         if (WARN(link_id >= ARRAY_SIZE(sdata->link),
 681                  "bad SMPS status link: %d\n", link_id))
 682                 return;
 683
 684         link = rcu_dereference(sdata->link[link_id]);
 685         if (!link)
 686                 return;
 687
 688         /*
 689          * This update looks racy, but isn't, the only other place
 690          * updating this variable is in managed mode before assoc,
 691          * and we have to be associated to have a status from the
 692          * action frame TX, since we cannot send it while we're not
 693          * associated yet.
 694          */
 695         link->smps_mode = smps_mode;
 696         wiphy_work_queue(sdata->local->hw.wiphy, &link->u.mgd.recalc_smps);
 697 }
 698
 699 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 700                                       struct sk_buff *skb, bool dropped,
 701                                       ktime_t ack_hwtstamp)
 702 {
 703         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 704         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 705         struct ieee80211_hdr *hdr = (void *)skb->data;
 706         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 707
 708         if (dropped)
 709                 acked = false;
 710
 711         if (tx_time_est) {
 712                 struct sta_info *sta;
 713
 714                 rcu_read_lock();
 715
 716                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 717                 ieee80211_sta_update_pending_airtime(local, sta,
 718                                                      skb_get_queue_mapping(skb),
 719                                                      tx_time_est,
 720                                                      true);
 721                 rcu_read_unlock();
 722         }
 723
 724         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 725                 struct ieee80211_sub_if_data *sdata;
 726
 727                 rcu_read_lock();
 728
 729                 sdata = ieee80211_sdata_from_skb(local, skb);
 730
 731                 if (!sdata) {
 732                         skb->dev = NULL;
 733                 } else if (!dropped) {
 734                         /* Check to see if packet is a TDLS teardown packet */
 735                         if (ieee80211_is_data(hdr->frame_control) &&
 736                             (ieee80211_get_tdls_action(skb) ==
 737                              WLAN_TDLS_TEARDOWN)) {
 738                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 739                                                             info->flags);
 740                         } else if (ieee80211_s1g_is_twt_setup(skb)) {
 741                                 if (!acked) {
 742                                         struct sk_buff *qskb;
 743
 744                                         qskb = skb_clone(skb, GFP_ATOMIC);
 745                                         if (qskb) {
 746                                                 skb_queue_tail(&sdata->status_queue,
 747                                                                qskb);
 748                                                 wiphy_work_queue(local->hw.wiphy,
 749                                                                  &sdata->work);
 750                                         }
 751                                 }
 752                         } else {
 753                                 ieee80211_mgd_conn_tx_status(sdata,
 754                                                              hdr->frame_control,
 755                                                              acked);
 756                         }
 757                 }
 758
 759                 rcu_read_unlock();
 760         } else if (info->status_data_idr) {
 761                 ieee80211_report_ack_skb(local, skb, acked, dropped,
 762                                          ack_hwtstamp);
 763         } else if (info->status_data) {
 764                 struct ieee80211_sub_if_data *sdata;
 765
 766                 rcu_read_lock();
 767
 768                 sdata = ieee80211_sdata_from_skb(local, skb);
 769
 770                 switch (u16_get_bits(info->status_data,
 771                                      IEEE80211_STATUS_TYPE_MASK)) {
 772                 case IEEE80211_STATUS_TYPE_SMPS:
 773                         ieee80211_handle_smps_status(sdata, acked,
 774                                                      info->status_data);
 775                         break;
 776                 }
 777                 rcu_read_unlock();
 778         }
 779
 780         if (!dropped && skb->destructor) {
 781                 skb->wifi_acked_valid = 1;
 782                 skb->wifi_acked = acked;
 783         }
 784
 785         ieee80211_led_tx(local);
 786
 787         if (skb_has_frag_list(skb)) {
 788                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 789                 skb_shinfo(skb)->frag_list = NULL;
 790         }
 791 }
 792
 793 /*
 794  * Use a static threshold for now, best value to be determined
 795  * by testing ...
 796  * Should it depend on:
 797  *  - on # of retransmissions
 798  *  - current throughput (higher value for higher tpt)?
 799  */
 800 #define STA_LOST_PKT_THRESHOLD  50
 801 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 802 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 803
 804 static void ieee80211_lost_packet(struct sta_info *sta,
 805                                   struct ieee80211_tx_info *info)
 806 {
 807         unsigned long pkt_time = STA_LOST_PKT_TIME;
 808         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 809
 810         /* If driver relies on its own algorithm for station kickout, skip
 811          * mac80211 packet loss mechanism.
 812          */
 813         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 814                 return;
 815
 816         /* This packet was aggregated but doesn't carry status info */
 817         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 818             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 819                 return;
 820
 821         sta->deflink.status_stats.lost_packets++;
 822         if (sta->sta.tdls) {
 823                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 824                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 825         }
 826
 827         /*
 828          * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
 829          * of the last packets were lost, and that no ACK was received in the
 830          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 831          * mechanism.
 832          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 833          */
 834         if (sta->deflink.status_stats.lost_packets < pkt_thr ||
 835             !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
 836                 return;
 837
 838         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 839                                     sta->deflink.status_stats.lost_packets,
 840                                     GFP_ATOMIC);
 841         sta->deflink.status_stats.lost_packets = 0;
 842 }
 843
 844 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 845                                   struct ieee80211_tx_info *info,
 846                                   int *retry_count)
 847 {
 848         int count = -1;
 849         int i;
 850
 851         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 852                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 853                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 854                         /* just the first aggr frame carry status info */
 855                         info->status.rates[i].idx = -1;
 856                         info->status.rates[i].count = 0;
 857                         break;
 858                 } else if (info->status.rates[i].idx < 0) {
 859                         break;
 860                 } else if (i >= hw->max_report_rates) {
 861                         /* the HW cannot have attempted that rate */
 862                         info->status.rates[i].idx = -1;
 863                         info->status.rates[i].count = 0;
 864                         break;
 865                 }
 866
 867                 count += info->status.rates[i].count;
 868         }
 869
 870         if (count < 0)
 871                 count = 0;
 872
 873         *retry_count = count;
 874         return i - 1;
 875 }
 876
 877 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 878                           int retry_count, bool send_to_cooked,
 879                           struct ieee80211_tx_status *status)
 880 {
 881         struct sk_buff *skb2;
 882         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 883         struct ieee80211_sub_if_data *sdata;
 884         struct net_device *prev_dev = NULL;
 885         int rtap_len;
 886
 887         /* send frame to monitor interfaces now */
 888         rtap_len = ieee80211_tx_radiotap_len(info, status);
 889         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 890                 pr_err("ieee80211_tx_status: headroom too small\n");
 891                 dev_kfree_skb(skb);
 892                 return;
 893         }
 894         ieee80211_add_tx_radiotap_header(local, skb, retry_count,
 895                                          rtap_len, status);
 896
 897         /* XXX: is this sufficient for BPF? */
 898         skb_reset_mac_header(skb);
 899         skb->ip_summed = CHECKSUM_UNNECESSARY;
 900         skb->pkt_type = PACKET_OTHERHOST;
 901         skb->protocol = htons(ETH_P_802_2);
 902         memset(skb->cb, 0, sizeof(skb->cb));
 903
 904         rcu_read_lock();
 905         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 906                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 907                         if (!ieee80211_sdata_running(sdata))
 908                                 continue;
 909
 910                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 911                             !send_to_cooked)
 912                                 continue;
 913
 914                         if (prev_dev) {
 915                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 916                                 if (skb2) {
 917                                         skb2->dev = prev_dev;
 918                                         netif_rx(skb2);
 919                                 }
 920                         }
 921
 922                         prev_dev = sdata->dev;
 923                 }
 924         }
 925         if (prev_dev) {
 926                 skb->dev = prev_dev;
 927                 netif_rx(skb);
 928                 skb = NULL;
 929         }
 930         rcu_read_unlock();
 931         dev_kfree_skb(skb);
 932 }
 933
 934 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 935                                   struct ieee80211_tx_status *status,
 936                                   int rates_idx, int retry_count)
 937 {
 938         struct sk_buff *skb = status->skb;
 939         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 940         struct ieee80211_local *local = hw_to_local(hw);
 941         struct ieee80211_tx_info *info = status->info;
 942         struct sta_info *sta;
 943         __le16 fc;
 944         bool send_to_cooked;
 945         bool acked;
 946         bool noack_success;
 947         struct ieee80211_bar *bar;
 948         int tid = IEEE80211_NUM_TIDS;
 949
 950         fc = hdr->frame_control;
 951
 952         if (status->sta) {
 953                 sta = container_of(status->sta, struct sta_info, sta);
 954
 955                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 956                         clear_sta_flag(sta, WLAN_STA_SP);
 957
 958                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 959                 noack_success = !!(info->flags &
 960                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 961
 962                 /* mesh Peer Service Period support */
 963                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 964                     ieee80211_is_data_qos(fc))
 965                         ieee80211_mpsp_trigger_process(
 966                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 967
 968                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 969                     (ieee80211_is_data(hdr->frame_control)) &&
 970                     (rates_idx != -1))
 971                         sta->deflink.tx_stats.last_rate =
 972                                 info->status.rates[rates_idx];
 973
 974                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 975                     (ieee80211_is_data_qos(fc))) {
 976                         u16 ssn;
 977                         u8 *qc;
 978
 979                         qc = ieee80211_get_qos_ctl(hdr);
 980                         tid = qc[0] & 0xf;
 981                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 982                                                 & IEEE80211_SCTL_SEQ);
 983                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 984                                            tid, ssn);
 985                 } else if (ieee80211_is_data_qos(fc)) {
 986                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 987
 988                         tid = qc[0] & 0xf;
 989                 }
 990
 991                 if (!acked && ieee80211_is_back_req(fc)) {
 992                         u16 control;
 993
 994                         /*
 995                          * BAR failed, store the last SSN and retry sending
 996                          * the BAR when the next unicast transmission on the
 997                          * same TID succeeds.
 998                          */
 999                         bar = (struct ieee80211_bar *) skb->data;
1000                         control = le16_to_cpu(bar->control);
1001                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
1002                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
1003
1004                                 tid = (control &
1005                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
1006                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
1007
1008                                 ieee80211_set_bar_pending(sta, tid, ssn);
1009                         }
1010                 }
1011
1012                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1013                         ieee80211_handle_filtered_frame(local, sta, skb);
1014                         return;
1015                 } else if (ieee80211_is_data_present(fc)) {
1016                         if (!acked && !noack_success)
1017                                 sta->deflink.status_stats.msdu_failed[tid]++;
1018
1019                         sta->deflink.status_stats.msdu_retries[tid] +=
1020                                 retry_count;
1021                 }
1022
1023                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1024                         ieee80211_frame_acked(sta, skb);
1025
1026         }
1027
1028         /* SNMP counters
1029          * Fragments are passed to low-level drivers as separate skbs, so these
1030          * are actually fragments, not frames. Update frame counters only for
1031          * the first fragment of the frame. */
1032         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1033             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1034                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1035                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1036                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1037                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1038                         if (retry_count > 0)
1039                                 I802_DEBUG_INC(local->dot11RetryCount);
1040                         if (retry_count > 1)
1041                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1042                 }
1043
1044                 /* This counter shall be incremented for an acknowledged MPDU
1045                  * with an individual address in the address 1 field or an MPDU
1046                  * with a multicast address in the address 1 field of type Data
1047                  * or Management. */
1048                 if (!is_multicast_ether_addr(hdr->addr1) ||
1049                     ieee80211_is_data(fc) ||
1050                     ieee80211_is_mgmt(fc))
1051                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1052         } else {
1053                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1054                         I802_DEBUG_INC(local->dot11FailedCount);
1055         }
1056
1057         if (ieee80211_is_any_nullfunc(fc) &&
1058             ieee80211_has_pm(fc) &&
1059             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1060             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1061             local->ps_sdata && !(local->scanning)) {
1062                 if (info->flags & IEEE80211_TX_STAT_ACK)
1063                         local->ps_sdata->u.mgd.flags |=
1064                                         IEEE80211_STA_NULLFUNC_ACKED;
1065                 mod_timer(&local->dynamic_ps_timer,
1066                           jiffies + msecs_to_jiffies(10));
1067         }
1068
1069         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1070
1071         /* this was a transmitted frame, but now we want to reuse it */
1072         skb_orphan(skb);
1073
1074         /* Need to make a copy before skb->cb gets cleared */
1075         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1076                          !(ieee80211_is_data(fc));
1077
1078         /*
1079          * This is a bit racy but we can avoid a lot of work
1080          * with this test...
1081          */
1082         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1083                 if (status->free_list)
1084                         list_add_tail(&skb->list, status->free_list);
1085                 else
1086                         dev_kfree_skb(skb);
1087                 return;
1088         }
1089
1090         /* send to monitor interfaces */
1091         ieee80211_tx_monitor(local, skb, retry_count,
1092                              send_to_cooked, status);
1093 }
1094
1095 void ieee80211_tx_status_skb(struct ieee80211_hw *hw, struct sk_buff *skb)
1096 {
1097         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1098         struct ieee80211_local *local = hw_to_local(hw);
1099         struct ieee80211_tx_status status = {
1100                 .skb = skb,
1101                 .info = IEEE80211_SKB_CB(skb),
1102         };
1103         struct sta_info *sta;
1104
1105         rcu_read_lock();
1106
1107         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1108         if (sta)
1109                 status.sta = &sta->sta;
1110
1111         ieee80211_tx_status_ext(hw, &status);
1112         rcu_read_unlock();
1113 }
1114 EXPORT_SYMBOL(ieee80211_tx_status_skb);
1115
1116 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1117                              struct ieee80211_tx_status *status)
1118 {
1119         struct ieee80211_local *local = hw_to_local(hw);
1120         struct ieee80211_tx_info *info = status->info;
1121         struct ieee80211_sta *pubsta = status->sta;
1122         struct sk_buff *skb = status->skb;
1123         struct sta_info *sta = NULL;
1124         int rates_idx, retry_count;
1125         bool acked, noack_success, ack_signal_valid;
1126         u16 tx_time_est;
1127
1128         if (pubsta) {
1129                 sta = container_of(pubsta, struct sta_info, sta);
1130
1131                 if (status->n_rates)
1132                         sta->deflink.tx_stats.last_rate_info =
1133                                 status->rates[status->n_rates - 1].rate_idx;
1134         }
1135
1136         if (skb && (tx_time_est =
1137                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1138                 /* Do this here to avoid the expensive lookup of the sta
1139                  * in ieee80211_report_used_skb().
1140                  */
1141                 ieee80211_sta_update_pending_airtime(local, sta,
1142                                                      skb_get_queue_mapping(skb),
1143                                                      tx_time_est,
1144                                                      true);
1145                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1146         }
1147
1148         if (!status->info)
1149                 goto free;
1150
1151         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1152
1153         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1154         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1155         ack_signal_valid =
1156                 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1157
1158         if (pubsta) {
1159                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1160
1161                 if (!acked && !noack_success)
1162                         sta->deflink.status_stats.retry_failed++;
1163                 sta->deflink.status_stats.retry_count += retry_count;
1164
1165                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1166                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1167                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1168                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1169                                                         acked, info->status.tx_time);
1170
1171                         if (acked) {
1172                                 sta->deflink.status_stats.last_ack = jiffies;
1173
1174                                 if (sta->deflink.status_stats.lost_packets)
1175                                         sta->deflink.status_stats.lost_packets = 0;
1176
1177                                 /* Track when last packet was ACKed */
1178                                 sta->deflink.status_stats.last_pkt_time = jiffies;
1179
1180                                 /* Reset connection monitor */
1181                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1182                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1183                                         sdata->u.mgd.probe_send_count = 0;
1184
1185                                 if (ack_signal_valid) {
1186                                         sta->deflink.status_stats.last_ack_signal =
1187                                                          (s8)info->status.ack_signal;
1188                                         sta->deflink.status_stats.ack_signal_filled = true;
1189                                         ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1190                                                             -info->status.ack_signal);
1191                                 }
1192                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1193                                 /*
1194                                  * The STA is in power save mode, so assume
1195                                  * that this TX packet failed because of that.
1196                                  */
1197                                 if (skb)
1198                                         ieee80211_handle_filtered_frame(local, sta, skb);
1199                                 return;
1200                         } else if (noack_success) {
1201                                 /* nothing to do here, do not account as lost */
1202                         } else {
1203                                 ieee80211_lost_packet(sta, info);
1204                         }
1205                 }
1206
1207                 rate_control_tx_status(local, status);
1208                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1209                         ieee80211s_update_metric(local, sta, status);
1210         }
1211
1212         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1213                 return __ieee80211_tx_status(hw, status, rates_idx,
1214                                              retry_count);
1215
1216         if (acked || noack_success) {
1217                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1218                 if (!pubsta)
1219                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1220                 if (retry_count > 0)
1221                         I802_DEBUG_INC(local->dot11RetryCount);
1222                 if (retry_count > 1)
1223                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1224         } else {
1225                 I802_DEBUG_INC(local->dot11FailedCount);
1226         }
1227
1228 free:
1229         if (!skb)
1230                 return;
1231
1232         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1233         if (status->free_list)
1234                 list_add_tail(&skb->list, status->free_list);
1235         else
1236                 dev_kfree_skb(skb);
1237 }
1238 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1239
1240 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1241                               struct ieee80211_sta *pubsta,
1242                               struct ieee80211_tx_info *info)
1243 {
1244         struct ieee80211_local *local = hw_to_local(hw);
1245         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1246         struct ieee80211_tx_status status = {
1247                 .info = info,
1248                 .sta = pubsta,
1249         };
1250
1251         rate_control_tx_status(local, &status);
1252
1253         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1254                 sta->deflink.tx_stats.last_rate = info->status.rates[0];
1255 }
1256 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1257
1258 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1259 {
1260         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1261         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1262                                     num_packets, GFP_ATOMIC);
1263 }
1264 EXPORT_SYMBOL(ieee80211_report_low_ack);
1265
1266 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1267 {
1268         struct ieee80211_local *local = hw_to_local(hw);
1269         ktime_t kt = ktime_set(0, 0);
1270
1271         ieee80211_report_used_skb(local, skb, true, kt);
1272         dev_kfree_skb_any(skb);
1273 }
1274 EXPORT_SYMBOL(ieee80211_free_txskb);
1275
1276 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1277                               struct sk_buff_head *skbs)
1278 {
1279         struct sk_buff *skb;
1280
1281         while ((skb = __skb_dequeue(skbs)))
1282                 ieee80211_free_txskb(hw, skb);
1283 }