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 <[email protected]>
   6  * Copyright 2008-2010  Johannes Berg <[email protected]>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2021-2024  Intel Corporation
   9  */
  10
  11 #include <linux/export.h>
  12 #include <linux/etherdevice.h>
  13 #include <net/mac80211.h>
  14 #include <linux/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
 700 ieee80211_handle_teardown_ttlm_status(struct ieee80211_sub_if_data *sdata,
 701                                       bool acked)
 702 {
 703         if (!sdata || !ieee80211_sdata_running(sdata))
 704                 return;
 705
 706         if (!acked)
 707                 return;
 708
 709         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 710                 return;
 711
 712         wiphy_work_queue(sdata->local->hw.wiphy,
 713                          &sdata->u.mgd.teardown_ttlm_work);
 714 }
 715
 716 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 717                                       struct sk_buff *skb, bool dropped,
 718                                       ktime_t ack_hwtstamp)
 719 {
 720         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 721         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 722         struct ieee80211_hdr *hdr = (void *)skb->data;
 723         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 724
 725         if (dropped)
 726                 acked = false;
 727
 728         if (tx_time_est) {
 729                 struct sta_info *sta;
 730
 731                 rcu_read_lock();
 732
 733                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 734                 ieee80211_sta_update_pending_airtime(local, sta,
 735                                                      skb_get_queue_mapping(skb),
 736                                                      tx_time_est,
 737                                                      true);
 738                 rcu_read_unlock();
 739         }
 740
 741         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 742                 struct ieee80211_sub_if_data *sdata;
 743
 744                 rcu_read_lock();
 745
 746                 sdata = ieee80211_sdata_from_skb(local, skb);
 747
 748                 if (!sdata) {
 749                         skb->dev = NULL;
 750                 } else if (!dropped) {
 751                         /* Check to see if packet is a TDLS teardown packet */
 752                         if (ieee80211_is_data(hdr->frame_control) &&
 753                             (ieee80211_get_tdls_action(skb) ==
 754                              WLAN_TDLS_TEARDOWN)) {
 755                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 756                                                             info->flags);
 757                         } else if (ieee80211_s1g_is_twt_setup(skb)) {
 758                                 if (!acked) {
 759                                         struct sk_buff *qskb;
 760
 761                                         qskb = skb_clone(skb, GFP_ATOMIC);
 762                                         if (qskb) {
 763                                                 skb_queue_tail(&sdata->status_queue,
 764                                                                qskb);
 765                                                 wiphy_work_queue(local->hw.wiphy,
 766                                                                  &sdata->work);
 767                                         }
 768                                 }
 769                         } else {
 770                                 ieee80211_mgd_conn_tx_status(sdata,
 771                                                              hdr->frame_control,
 772                                                              acked);
 773                         }
 774                 }
 775
 776                 rcu_read_unlock();
 777         } else if (info->status_data_idr) {
 778                 ieee80211_report_ack_skb(local, skb, acked, dropped,
 779                                          ack_hwtstamp);
 780         } else if (info->status_data) {
 781                 struct ieee80211_sub_if_data *sdata;
 782
 783                 rcu_read_lock();
 784
 785                 sdata = ieee80211_sdata_from_skb(local, skb);
 786
 787                 switch (u16_get_bits(info->status_data,
 788                                      IEEE80211_STATUS_TYPE_MASK)) {
 789                 case IEEE80211_STATUS_TYPE_SMPS:
 790                         ieee80211_handle_smps_status(sdata, acked,
 791                                                      info->status_data);
 792                         break;
 793                 case IEEE80211_STATUS_TYPE_NEG_TTLM:
 794                         ieee80211_handle_teardown_ttlm_status(sdata, acked);
 795                         break;
 796                 }
 797                 rcu_read_unlock();
 798         }
 799
 800         if (!dropped && skb->destructor) {
 801                 skb->wifi_acked_valid = 1;
 802                 skb->wifi_acked = acked;
 803         }
 804
 805         ieee80211_led_tx(local);
 806
 807         if (skb_has_frag_list(skb)) {
 808                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 809                 skb_shinfo(skb)->frag_list = NULL;
 810         }
 811 }
 812
 813 /*
 814  * Use a static threshold for now, best value to be determined
 815  * by testing ...
 816  * Should it depend on:
 817  *  - on # of retransmissions
 818  *  - current throughput (higher value for higher tpt)?
 819  */
 820 #define STA_LOST_PKT_THRESHOLD  50
 821 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 822 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 823
 824 static void ieee80211_lost_packet(struct sta_info *sta,
 825                                   struct ieee80211_tx_info *info)
 826 {
 827         unsigned long pkt_time = STA_LOST_PKT_TIME;
 828         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 829
 830         /* If driver relies on its own algorithm for station kickout, skip
 831          * mac80211 packet loss mechanism.
 832          */
 833         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 834                 return;
 835
 836         /* This packet was aggregated but doesn't carry status info */
 837         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 838             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 839                 return;
 840
 841         sta->deflink.status_stats.lost_packets++;
 842         if (sta->sta.tdls) {
 843                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 844                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 845         }
 846
 847         /*
 848          * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
 849          * of the last packets were lost, and that no ACK was received in the
 850          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 851          * mechanism.
 852          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 853          */
 854         if (sta->deflink.status_stats.lost_packets < pkt_thr ||
 855             !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
 856                 return;
 857
 858         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 859                                     sta->deflink.status_stats.lost_packets,
 860                                     GFP_ATOMIC);
 861         sta->deflink.status_stats.lost_packets = 0;
 862 }
 863
 864 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 865                                   struct ieee80211_tx_info *info,
 866                                   int *retry_count)
 867 {
 868         int count = -1;
 869         int i;
 870
 871         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 872                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 873                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 874                         /* just the first aggr frame carry status info */
 875                         info->status.rates[i].idx = -1;
 876                         info->status.rates[i].count = 0;
 877                         break;
 878                 } else if (info->status.rates[i].idx < 0) {
 879                         break;
 880                 } else if (i >= hw->max_report_rates) {
 881                         /* the HW cannot have attempted that rate */
 882                         info->status.rates[i].idx = -1;
 883                         info->status.rates[i].count = 0;
 884                         break;
 885                 }
 886
 887                 count += info->status.rates[i].count;
 888         }
 889
 890         if (count < 0)
 891                 count = 0;
 892
 893         *retry_count = count;
 894         return i - 1;
 895 }
 896
 897 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 898                           int retry_count, bool send_to_cooked,
 899                           struct ieee80211_tx_status *status)
 900 {
 901         struct sk_buff *skb2;
 902         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 903         struct ieee80211_sub_if_data *sdata;
 904         struct net_device *prev_dev = NULL;
 905         int rtap_len;
 906
 907         /* send frame to monitor interfaces now */
 908         rtap_len = ieee80211_tx_radiotap_len(info, status);
 909         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 910                 pr_err("ieee80211_tx_status: headroom too small\n");
 911                 dev_kfree_skb(skb);
 912                 return;
 913         }
 914         ieee80211_add_tx_radiotap_header(local, skb, retry_count,
 915                                          rtap_len, status);
 916
 917         /* XXX: is this sufficient for BPF? */
 918         skb_reset_mac_header(skb);
 919         skb->ip_summed = CHECKSUM_UNNECESSARY;
 920         skb->pkt_type = PACKET_OTHERHOST;
 921         skb->protocol = htons(ETH_P_802_2);
 922         memset(skb->cb, 0, sizeof(skb->cb));
 923
 924         rcu_read_lock();
 925         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 926                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 927                         if (!ieee80211_sdata_running(sdata))
 928                                 continue;
 929
 930                         if (sdata->u.mntr.flags & MONITOR_FLAG_SKIP_TX)
 931                                 continue;
 932
 933                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 934                             !send_to_cooked)
 935                                 continue;
 936
 937                         if (prev_dev) {
 938                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 939                                 if (skb2) {
 940                                         skb2->dev = prev_dev;
 941                                         netif_rx(skb2);
 942                                 }
 943                         }
 944
 945                         prev_dev = sdata->dev;
 946                 }
 947         }
 948         if (prev_dev) {
 949                 skb->dev = prev_dev;
 950                 netif_rx(skb);
 951                 skb = NULL;
 952         }
 953         rcu_read_unlock();
 954         dev_kfree_skb(skb);
 955 }
 956
 957 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 958                                   struct ieee80211_tx_status *status,
 959                                   int rates_idx, int retry_count)
 960 {
 961         struct sk_buff *skb = status->skb;
 962         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 963         struct ieee80211_local *local = hw_to_local(hw);
 964         struct ieee80211_tx_info *info = status->info;
 965         struct sta_info *sta;
 966         __le16 fc;
 967         bool send_to_cooked;
 968         bool acked;
 969         bool noack_success;
 970         struct ieee80211_bar *bar;
 971         int tid = IEEE80211_NUM_TIDS;
 972
 973         fc = hdr->frame_control;
 974
 975         if (status->sta) {
 976                 sta = container_of(status->sta, struct sta_info, sta);
 977
 978                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 979                         clear_sta_flag(sta, WLAN_STA_SP);
 980
 981                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 982                 noack_success = !!(info->flags &
 983                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 984
 985                 /* mesh Peer Service Period support */
 986                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 987                     ieee80211_is_data_qos(fc))
 988                         ieee80211_mpsp_trigger_process(
 989                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 990
 991                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 992                     (ieee80211_is_data(hdr->frame_control)) &&
 993                     (rates_idx != -1))
 994                         sta->deflink.tx_stats.last_rate =
 995                                 info->status.rates[rates_idx];
 996
 997                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 998                     (ieee80211_is_data_qos(fc))) {
 999                         u16 ssn;
1000                         u8 *qc;
1001
1002                         qc = ieee80211_get_qos_ctl(hdr);
1003                         tid = qc[0] & 0xf;
1004                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1005                                                 & IEEE80211_SCTL_SEQ);
1006                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
1007                                            tid, ssn);
1008                 } else if (ieee80211_is_data_qos(fc)) {
1009                         u8 *qc = ieee80211_get_qos_ctl(hdr);
1010
1011                         tid = qc[0] & 0xf;
1012                 }
1013
1014                 if (!acked && ieee80211_is_back_req(fc)) {
1015                         u16 control;
1016
1017                         /*
1018                          * BAR failed, store the last SSN and retry sending
1019                          * the BAR when the next unicast transmission on the
1020                          * same TID succeeds.
1021                          */
1022                         bar = (struct ieee80211_bar *) skb->data;
1023                         control = le16_to_cpu(bar->control);
1024                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
1025                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
1026
1027                                 tid = (control &
1028                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
1029                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
1030
1031                                 ieee80211_set_bar_pending(sta, tid, ssn);
1032                         }
1033                 }
1034
1035                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1036                         ieee80211_handle_filtered_frame(local, sta, skb);
1037                         return;
1038                 } else if (ieee80211_is_data_present(fc)) {
1039                         if (!acked && !noack_success)
1040                                 sta->deflink.status_stats.msdu_failed[tid]++;
1041
1042                         sta->deflink.status_stats.msdu_retries[tid] +=
1043                                 retry_count;
1044                 }
1045
1046                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1047                         ieee80211_frame_acked(sta, skb);
1048
1049         }
1050
1051         /* SNMP counters
1052          * Fragments are passed to low-level drivers as separate skbs, so these
1053          * are actually fragments, not frames. Update frame counters only for
1054          * the first fragment of the frame. */
1055         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1056             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1057                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1058                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1059                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1060                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1061                         if (retry_count > 0)
1062                                 I802_DEBUG_INC(local->dot11RetryCount);
1063                         if (retry_count > 1)
1064                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1065                 }
1066
1067                 /* This counter shall be incremented for an acknowledged MPDU
1068                  * with an individual address in the address 1 field or an MPDU
1069                  * with a multicast address in the address 1 field of type Data
1070                  * or Management. */
1071                 if (!is_multicast_ether_addr(hdr->addr1) ||
1072                     ieee80211_is_data(fc) ||
1073                     ieee80211_is_mgmt(fc))
1074                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1075         } else {
1076                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1077                         I802_DEBUG_INC(local->dot11FailedCount);
1078         }
1079
1080         if (ieee80211_is_any_nullfunc(fc) &&
1081             ieee80211_has_pm(fc) &&
1082             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1083             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1084             local->ps_sdata && !(local->scanning)) {
1085                 if (info->flags & IEEE80211_TX_STAT_ACK)
1086                         local->ps_sdata->u.mgd.flags |=
1087                                         IEEE80211_STA_NULLFUNC_ACKED;
1088                 mod_timer(&local->dynamic_ps_timer,
1089                           jiffies + msecs_to_jiffies(10));
1090         }
1091
1092         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1093
1094         /* this was a transmitted frame, but now we want to reuse it */
1095         skb_orphan(skb);
1096
1097         /* Need to make a copy before skb->cb gets cleared */
1098         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1099                          !(ieee80211_is_data(fc));
1100
1101         /*
1102          * This is a bit racy but we can avoid a lot of work
1103          * with this test...
1104          */
1105         if (!local->tx_mntrs && (!send_to_cooked || !local->cooked_mntrs)) {
1106                 if (status->free_list)
1107                         list_add_tail(&skb->list, status->free_list);
1108                 else
1109                         dev_kfree_skb(skb);
1110                 return;
1111         }
1112
1113         /* send to monitor interfaces */
1114         ieee80211_tx_monitor(local, skb, retry_count,
1115                              send_to_cooked, status);
1116 }
1117
1118 void ieee80211_tx_status_skb(struct ieee80211_hw *hw, struct sk_buff *skb)
1119 {
1120         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1121         struct ieee80211_local *local = hw_to_local(hw);
1122         struct ieee80211_tx_status status = {
1123                 .skb = skb,
1124                 .info = IEEE80211_SKB_CB(skb),
1125         };
1126         struct sta_info *sta;
1127
1128         rcu_read_lock();
1129
1130         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1131         if (sta)
1132                 status.sta = &sta->sta;
1133
1134         ieee80211_tx_status_ext(hw, &status);
1135         rcu_read_unlock();
1136 }
1137 EXPORT_SYMBOL(ieee80211_tx_status_skb);
1138
1139 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1140                              struct ieee80211_tx_status *status)
1141 {
1142         struct ieee80211_local *local = hw_to_local(hw);
1143         struct ieee80211_tx_info *info = status->info;
1144         struct ieee80211_sta *pubsta = status->sta;
1145         struct sk_buff *skb = status->skb;
1146         struct sta_info *sta = NULL;
1147         int rates_idx, retry_count;
1148         bool acked, noack_success, ack_signal_valid;
1149         u16 tx_time_est;
1150
1151         if (pubsta) {
1152                 sta = container_of(pubsta, struct sta_info, sta);
1153
1154                 if (status->n_rates)
1155                         sta->deflink.tx_stats.last_rate_info =
1156                                 status->rates[status->n_rates - 1].rate_idx;
1157         }
1158
1159         if (skb && (tx_time_est =
1160                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1161                 /* Do this here to avoid the expensive lookup of the sta
1162                  * in ieee80211_report_used_skb().
1163                  */
1164                 ieee80211_sta_update_pending_airtime(local, sta,
1165                                                      skb_get_queue_mapping(skb),
1166                                                      tx_time_est,
1167                                                      true);
1168                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1169         }
1170
1171         if (!status->info)
1172                 goto free;
1173
1174         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1175
1176         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1177         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1178         ack_signal_valid =
1179                 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1180
1181         if (pubsta) {
1182                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1183
1184                 if (!acked && !noack_success)
1185                         sta->deflink.status_stats.retry_failed++;
1186                 sta->deflink.status_stats.retry_count += retry_count;
1187
1188                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1189                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1190                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1191                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1192                                                         acked, info->status.tx_time);
1193
1194                         if (acked) {
1195                                 sta->deflink.status_stats.last_ack = jiffies;
1196
1197                                 if (sta->deflink.status_stats.lost_packets)
1198                                         sta->deflink.status_stats.lost_packets = 0;
1199
1200                                 /* Track when last packet was ACKed */
1201                                 sta->deflink.status_stats.last_pkt_time = jiffies;
1202
1203                                 /* Reset connection monitor */
1204                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1205                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1206                                         sdata->u.mgd.probe_send_count = 0;
1207
1208                                 if (ack_signal_valid) {
1209                                         sta->deflink.status_stats.last_ack_signal =
1210                                                          (s8)info->status.ack_signal;
1211                                         sta->deflink.status_stats.ack_signal_filled = true;
1212                                         ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1213                                                             -info->status.ack_signal);
1214                                 }
1215                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1216                                 /*
1217                                  * The STA is in power save mode, so assume
1218                                  * that this TX packet failed because of that.
1219                                  */
1220                                 if (skb)
1221                                         ieee80211_handle_filtered_frame(local, sta, skb);
1222                                 return;
1223                         } else if (noack_success) {
1224                                 /* nothing to do here, do not account as lost */
1225                         } else {
1226                                 ieee80211_lost_packet(sta, info);
1227                         }
1228                 }
1229
1230                 rate_control_tx_status(local, status);
1231                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1232                         ieee80211s_update_metric(local, sta, status);
1233         }
1234
1235         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1236                 return __ieee80211_tx_status(hw, status, rates_idx,
1237                                              retry_count);
1238
1239         if (acked || noack_success) {
1240                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1241                 if (!pubsta)
1242                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1243                 if (retry_count > 0)
1244                         I802_DEBUG_INC(local->dot11RetryCount);
1245                 if (retry_count > 1)
1246                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1247         } else {
1248                 I802_DEBUG_INC(local->dot11FailedCount);
1249         }
1250
1251 free:
1252         if (!skb)
1253                 return;
1254
1255         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1256         if (status->free_list)
1257                 list_add_tail(&skb->list, status->free_list);
1258         else
1259                 dev_kfree_skb(skb);
1260 }
1261 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1262
1263 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1264                               struct ieee80211_sta *pubsta,
1265                               struct ieee80211_tx_info *info)
1266 {
1267         struct ieee80211_local *local = hw_to_local(hw);
1268         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1269         struct ieee80211_tx_status status = {
1270                 .info = info,
1271                 .sta = pubsta,
1272         };
1273
1274         rate_control_tx_status(local, &status);
1275
1276         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1277                 sta->deflink.tx_stats.last_rate = info->status.rates[0];
1278 }
1279 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1280
1281 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1282 {
1283         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1284         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1285                                     num_packets, GFP_ATOMIC);
1286 }
1287 EXPORT_SYMBOL(ieee80211_report_low_ack);
1288
1289 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1290 {
1291         struct ieee80211_local *local = hw_to_local(hw);
1292         ktime_t kt = ktime_set(0, 0);
1293
1294         ieee80211_report_used_skb(local, skb, true, kt);
1295         dev_kfree_skb_any(skb);
1296 }
1297 EXPORT_SYMBOL(ieee80211_free_txskb);
1298
1299 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1300                               struct sk_buff_head *skbs)
1301 {
1302         struct sk_buff *skb;
1303
1304         while ((skb = __skb_dequeue(skbs)))
1305                 ieee80211_free_txskb(hw, skb);
1306 }
1307 EXPORT_SYMBOL(ieee80211_purge_tx_queue);