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         struct ieee80211_local *local = sta->local;
 188         struct ieee80211_sub_if_data *sdata = sta->sdata;
 189
 190         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 191                 struct ieee80211_hdr *hdr = (void *) skb->data;
 192                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 193                 u16 tid = qc[0] & 0xf;
 194
 195                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 196         }
 197
 198         if (ieee80211_is_action(mgmt->frame_control) &&
 199             !ieee80211_has_protected(mgmt->frame_control) &&
 200             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 201             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 202             ieee80211_sdata_running(sdata)) {
 203                 enum ieee80211_smps_mode smps_mode;
 204
 205                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 206                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 207                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 208                         break;
 209                 case WLAN_HT_SMPS_CONTROL_STATIC:
 210                         smps_mode = IEEE80211_SMPS_STATIC;
 211                         break;
 212                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 213                 default: /* shouldn't happen since we don't send that */
 214                         smps_mode = IEEE80211_SMPS_OFF;
 215                         break;
 216                 }
 217
 218                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 219                         /*
 220                          * This update looks racy, but isn't -- if we come
 221                          * here we've definitely got a station that we're
 222                          * talking to, and on a managed interface that can
 223                          * only be the AP. And the only other place updating
 224                          * this variable in managed mode is before association.
 225                          */
 226                         sdata->deflink.smps_mode = smps_mode;
 227                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 228                 }
 229         }
 230 }
 231
 232 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 233 {
 234         struct tid_ampdu_tx *tid_tx;
 235
 236         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 237         if (!tid_tx)
 238                 return;
 239
 240         tid_tx->failed_bar_ssn = ssn;
 241         tid_tx->bar_pending = true;
 242 }
 243
 244 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 245                                      struct ieee80211_tx_status *status)
 246 {
 247         struct ieee80211_rate_status *status_rate = NULL;
 248         int len = sizeof(struct ieee80211_radiotap_header);
 249
 250         if (status && status->n_rates)
 251                 status_rate = &status->rates[status->n_rates - 1];
 252
 253         /* IEEE80211_RADIOTAP_RATE rate */
 254         if (status_rate && !(status_rate->rate_idx.flags &
 255                                                 (RATE_INFO_FLAGS_MCS |
 256                                                  RATE_INFO_FLAGS_DMG |
 257                                                  RATE_INFO_FLAGS_EDMG |
 258                                                  RATE_INFO_FLAGS_VHT_MCS |
 259                                                  RATE_INFO_FLAGS_HE_MCS)))
 260                 len += 2;
 261         else if (info->status.rates[0].idx >= 0 &&
 262                  !(info->status.rates[0].flags &
 263                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 264                 len += 2;
 265
 266         /* IEEE80211_RADIOTAP_TX_FLAGS */
 267         len += 2;
 268
 269         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 270         len += 1;
 271
 272         /* IEEE80211_RADIOTAP_MCS
 273          * IEEE80211_RADIOTAP_VHT */
 274         if (status_rate) {
 275                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS)
 276                         len += 3;
 277                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS)
 278                         len = ALIGN(len, 2) + 12;
 279                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_HE_MCS)
 280                         len = ALIGN(len, 2) + 12;
 281         } else if (info->status.rates[0].idx >= 0) {
 282                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 283                         len += 3;
 284                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 285                         len = ALIGN(len, 2) + 12;
 286         }
 287
 288         return len;
 289 }
 290
 291 static void
 292 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 293                                  struct sk_buff *skb, int retry_count,
 294                                  int rtap_len, int shift,
 295                                  struct ieee80211_tx_status *status)
 296 {
 297         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 298         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 299         struct ieee80211_radiotap_header *rthdr;
 300         struct ieee80211_rate_status *status_rate = NULL;
 301         unsigned char *pos;
 302         u16 legacy_rate = 0;
 303         u16 txflags;
 304
 305         if (status && status->n_rates)
 306                 status_rate = &status->rates[status->n_rates - 1];
 307
 308         rthdr = skb_push(skb, rtap_len);
 309
 310         memset(rthdr, 0, rtap_len);
 311         rthdr->it_len = cpu_to_le16(rtap_len);
 312         rthdr->it_present =
 313                 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
 314                             BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
 315         pos = (unsigned char *)(rthdr + 1);
 316
 317         /*
 318          * XXX: Once radiotap gets the bitmap reset thing the vendor
 319          *      extensions proposal contains, we can actually report
 320          *      the whole set of tries we did.
 321          */
 322
 323         /* IEEE80211_RADIOTAP_RATE */
 324
 325         if (status_rate) {
 326                 if (!(status_rate->rate_idx.flags &
 327                                                 (RATE_INFO_FLAGS_MCS |
 328                                                  RATE_INFO_FLAGS_DMG |
 329                                                  RATE_INFO_FLAGS_EDMG |
 330                                                  RATE_INFO_FLAGS_VHT_MCS |
 331                                                  RATE_INFO_FLAGS_HE_MCS)))
 332                         legacy_rate = status_rate->rate_idx.legacy;
 333         } else if (info->status.rates[0].idx >= 0 &&
 334                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 335                                                   IEEE80211_TX_RC_VHT_MCS))) {
 336                 struct ieee80211_supported_band *sband;
 337
 338                 sband = local->hw.wiphy->bands[info->band];
 339                 legacy_rate =
 340                         sband->bitrates[info->status.rates[0].idx].bitrate;
 341         }
 342
 343         if (legacy_rate) {
 344                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 345                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 346                 /* padding for tx flags */
 347                 pos += 2;
 348         }
 349
 350         /* IEEE80211_RADIOTAP_TX_FLAGS */
 351         txflags = 0;
 352         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 353             !is_multicast_ether_addr(hdr->addr1))
 354                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 355
 356         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 357                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 358         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 359                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 360
 361         put_unaligned_le16(txflags, pos);
 362         pos += 2;
 363
 364         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 365         /* for now report the total retry_count */
 366         *pos = retry_count;
 367         pos++;
 368
 369         if (status_rate && (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS))
 370         {
 371                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 372                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 373                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 374                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 375                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 376                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 377                 if (status_rate->rate_idx.bw == RATE_INFO_BW_40)
 378                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 379                 pos[2] = status_rate->rate_idx.mcs;
 380                 pos += 3;
 381         } else if (status_rate && (status_rate->rate_idx.flags &
 382                                         RATE_INFO_FLAGS_VHT_MCS))
 383         {
 384                 u16 known = local->hw.radiotap_vht_details &
 385                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 386                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 387
 388                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 389
 390                 /* required alignment from rthdr */
 391                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 392
 393                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 394                 put_unaligned_le16(known, pos);
 395                 pos += 2;
 396
 397                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 398                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 399                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 400                 pos++;
 401
 402                 /* u8 bandwidth */
 403                 switch (status_rate->rate_idx.bw) {
 404                 case RATE_INFO_BW_160:
 405                         *pos = 11;
 406                         break;
 407                 case RATE_INFO_BW_80:
 408                         *pos = 4;
 409                         break;
 410                 case RATE_INFO_BW_40:
 411                         *pos = 1;
 412                         break;
 413                 default:
 414                         *pos = 0;
 415                         break;
 416                 }
 417                 pos++;
 418
 419                 /* u8 mcs_nss[4] */
 420                 *pos = (status_rate->rate_idx.mcs << 4) |
 421                                 status_rate->rate_idx.nss;
 422                 pos += 4;
 423
 424                 /* u8 coding */
 425                 pos++;
 426                 /* u8 group_id */
 427                 pos++;
 428                 /* u16 partial_aid */
 429                 pos += 2;
 430         } else if (status_rate && (status_rate->rate_idx.flags &
 431                                         RATE_INFO_FLAGS_HE_MCS))
 432         {
 433                 struct ieee80211_radiotap_he *he;
 434
 435                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 436
 437                 /* required alignment from rthdr */
 438                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 439                 he = (struct ieee80211_radiotap_he *)pos;
 440
 441                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 442                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 443                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 444                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 445
 446                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 447
 448 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 449
 450                 he->data6 |= HE_PREP(DATA6_NSTS, status_rate->rate_idx.nss);
 451
 452 #define CHECK_GI(s) \
 453         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 454         (int)NL80211_RATE_INFO_HE_GI_##s)
 455
 456                 CHECK_GI(0_8);
 457                 CHECK_GI(1_6);
 458                 CHECK_GI(3_2);
 459
 460                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status_rate->rate_idx.mcs);
 461                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status_rate->rate_idx.he_dcm);
 462
 463                 he->data5 |= HE_PREP(DATA5_GI, status_rate->rate_idx.he_gi);
 464
 465                 switch (status_rate->rate_idx.bw) {
 466                 case RATE_INFO_BW_20:
 467                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 468                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 469                         break;
 470                 case RATE_INFO_BW_40:
 471                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 472                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 473                         break;
 474                 case RATE_INFO_BW_80:
 475                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 476                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 477                         break;
 478                 case RATE_INFO_BW_160:
 479                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 480                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 481                         break;
 482                 case RATE_INFO_BW_HE_RU:
 483 #define CHECK_RU_ALLOC(s) \
 484         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 485         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 486
 487                         CHECK_RU_ALLOC(26);
 488                         CHECK_RU_ALLOC(52);
 489                         CHECK_RU_ALLOC(106);
 490                         CHECK_RU_ALLOC(242);
 491                         CHECK_RU_ALLOC(484);
 492                         CHECK_RU_ALLOC(996);
 493                         CHECK_RU_ALLOC(2x996);
 494
 495                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 496                                              status_rate->rate_idx.he_ru_alloc + 4);
 497                         break;
 498                 default:
 499                         WARN_ONCE(1, "Invalid SU BW %d\n", status_rate->rate_idx.bw);
 500                 }
 501
 502                 pos += sizeof(struct ieee80211_radiotap_he);
 503         }
 504
 505         if (status_rate || info->status.rates[0].idx < 0)
 506                 return;
 507
 508         /* IEEE80211_RADIOTAP_MCS
 509          * IEEE80211_RADIOTAP_VHT */
 510         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 511                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 512                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 513                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 514                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 515                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 516                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 517                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 518                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 519                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 520                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 521                 pos[2] = info->status.rates[0].idx;
 522                 pos += 3;
 523         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 524                 u16 known = local->hw.radiotap_vht_details &
 525                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 526                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 527
 528                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 529
 530                 /* required alignment from rthdr */
 531                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 532
 533                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 534                 put_unaligned_le16(known, pos);
 535                 pos += 2;
 536
 537                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 538                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 539                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 540                 pos++;
 541
 542                 /* u8 bandwidth */
 543                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 544                         *pos = 1;
 545                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 546                         *pos = 4;
 547                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 548                         *pos = 11;
 549                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 550                         *pos = 0;
 551                 pos++;
 552
 553                 /* u8 mcs_nss[4] */
 554                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 555                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 556                 pos += 4;
 557
 558                 /* u8 coding */
 559                 pos++;
 560                 /* u8 group_id */
 561                 pos++;
 562                 /* u16 partial_aid */
 563                 pos += 2;
 564         }
 565 }
 566
 567 /*
 568  * Handles the tx for TDLS teardown frames.
 569  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 570  */
 571 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 572                                         struct ieee80211_sub_if_data *sdata,
 573                                         struct sk_buff *skb, u32 flags)
 574 {
 575         struct sk_buff *teardown_skb;
 576         struct sk_buff *orig_teardown_skb;
 577         bool is_teardown = false;
 578
 579         /* Get the teardown data we need and free the lock */
 580         spin_lock(&sdata->u.mgd.teardown_lock);
 581         teardown_skb = sdata->u.mgd.teardown_skb;
 582         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 583         if ((skb == orig_teardown_skb) && teardown_skb) {
 584                 sdata->u.mgd.teardown_skb = NULL;
 585                 sdata->u.mgd.orig_teardown_skb = NULL;
 586                 is_teardown = true;
 587         }
 588         spin_unlock(&sdata->u.mgd.teardown_lock);
 589
 590         if (is_teardown) {
 591                 /* This mechanism relies on being able to get ACKs */
 592                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 593
 594                 /* Check if peer has ACKed */
 595                 if (flags & IEEE80211_TX_STAT_ACK) {
 596                         dev_kfree_skb_any(teardown_skb);
 597                 } else {
 598                         tdls_dbg(sdata,
 599                                  "TDLS Resending teardown through AP\n");
 600
 601                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 602                 }
 603         }
 604 }
 605
 606 static struct ieee80211_sub_if_data *
 607 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 608 {
 609         struct ieee80211_sub_if_data *sdata;
 610
 611         if (skb->dev) {
 612                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 613                         if (!sdata->dev)
 614                                 continue;
 615
 616                         if (skb->dev == sdata->dev)
 617                                 return sdata;
 618                 }
 619
 620                 return NULL;
 621         }
 622
 623         return rcu_dereference(local->p2p_sdata);
 624 }
 625
 626 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 627                                      struct sk_buff *orig_skb,
 628                                      bool acked, bool dropped,
 629                                      ktime_t ack_hwtstamp)
 630 {
 631         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(orig_skb);
 632         struct sk_buff *skb;
 633         unsigned long flags;
 634
 635         spin_lock_irqsave(&local->ack_status_lock, flags);
 636         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 637         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 638
 639         if (!skb)
 640                 return;
 641
 642         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 643                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 644                 struct ieee80211_sub_if_data *sdata;
 645                 struct ieee80211_hdr *hdr = (void *)skb->data;
 646                 bool is_valid_ack_signal =
 647                         !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
 648                 struct cfg80211_tx_status status = {
 649                         .cookie = cookie,
 650                         .buf = skb->data,
 651                         .len = skb->len,
 652                         .ack = acked,
 653                 };
 654
 655                 if (ieee80211_is_timing_measurement(orig_skb) ||
 656                     ieee80211_is_ftm(orig_skb)) {
 657                         status.tx_tstamp =
 658                                 ktime_to_ns(skb_hwtstamps(orig_skb)->hwtstamp);
 659                         status.ack_tstamp = ktime_to_ns(ack_hwtstamp);
 660                 }
 661
 662                 rcu_read_lock();
 663                 sdata = ieee80211_sdata_from_skb(local, skb);
 664                 if (sdata) {
 665                         if (skb->protocol == sdata->control_port_protocol ||
 666                             skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
 667                                 cfg80211_control_port_tx_status(&sdata->wdev,
 668                                                                 cookie,
 669                                                                 skb->data,
 670                                                                 skb->len,
 671                                                                 acked,
 672                                                                 GFP_ATOMIC);
 673                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 674                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 675                                                       cookie, acked,
 676                                                       info->status.ack_signal,
 677                                                       is_valid_ack_signal,
 678                                                       GFP_ATOMIC);
 679                         else if (ieee80211_is_mgmt(hdr->frame_control))
 680                                 cfg80211_mgmt_tx_status_ext(&sdata->wdev,
 681                                                             &status,
 682                                                             GFP_ATOMIC);
 683                         else
 684                                 pr_warn("Unknown status report in ack skb\n");
 685
 686                 }
 687                 rcu_read_unlock();
 688
 689                 dev_kfree_skb_any(skb);
 690         } else if (dropped) {
 691                 dev_kfree_skb_any(skb);
 692         } else {
 693                 /* consumes skb */
 694                 skb_complete_wifi_ack(skb, acked);
 695         }
 696 }
 697
 698 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 699                                       struct sk_buff *skb, bool dropped,
 700                                       ktime_t ack_hwtstamp)
 701 {
 702         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 703         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 704         struct ieee80211_hdr *hdr = (void *)skb->data;
 705         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 706
 707         if (dropped)
 708                 acked = false;
 709
 710         if (tx_time_est) {
 711                 struct sta_info *sta;
 712
 713                 rcu_read_lock();
 714
 715                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 716                 ieee80211_sta_update_pending_airtime(local, sta,
 717                                                      skb_get_queue_mapping(skb),
 718                                                      tx_time_est,
 719                                                      true);
 720                 rcu_read_unlock();
 721         }
 722
 723         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 724                 struct ieee80211_sub_if_data *sdata;
 725
 726                 rcu_read_lock();
 727
 728                 sdata = ieee80211_sdata_from_skb(local, skb);
 729
 730                 if (!sdata) {
 731                         skb->dev = NULL;
 732                 } else if (!dropped) {
 733                         unsigned int hdr_size =
 734                                 ieee80211_hdrlen(hdr->frame_control);
 735
 736                         /* Check to see if packet is a TDLS teardown packet */
 737                         if (ieee80211_is_data(hdr->frame_control) &&
 738                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 739                              WLAN_TDLS_TEARDOWN)) {
 740                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 741                                                             info->flags);
 742                         } else if (ieee80211_s1g_is_twt_setup(skb)) {
 743                                 if (!acked) {
 744                                         struct sk_buff *qskb;
 745
 746                                         qskb = skb_clone(skb, GFP_ATOMIC);
 747                                         if (qskb) {
 748                                                 skb_queue_tail(&sdata->status_queue,
 749                                                                qskb);
 750                                                 wiphy_work_queue(local->hw.wiphy,
 751                                                                  &sdata->work);
 752                                         }
 753                                 }
 754                         } else {
 755                                 ieee80211_mgd_conn_tx_status(sdata,
 756                                                              hdr->frame_control,
 757                                                              acked);
 758                         }
 759                 }
 760
 761                 rcu_read_unlock();
 762         } else if (info->ack_frame_id) {
 763                 ieee80211_report_ack_skb(local, skb, acked, dropped,
 764                                          ack_hwtstamp);
 765         }
 766
 767         if (!dropped && skb->destructor) {
 768                 skb->wifi_acked_valid = 1;
 769                 skb->wifi_acked = acked;
 770         }
 771
 772         ieee80211_led_tx(local);
 773
 774         if (skb_has_frag_list(skb)) {
 775                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 776                 skb_shinfo(skb)->frag_list = NULL;
 777         }
 778 }
 779
 780 /*
 781  * Use a static threshold for now, best value to be determined
 782  * by testing ...
 783  * Should it depend on:
 784  *  - on # of retransmissions
 785  *  - current throughput (higher value for higher tpt)?
 786  */
 787 #define STA_LOST_PKT_THRESHOLD  50
 788 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 789 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 790
 791 static void ieee80211_lost_packet(struct sta_info *sta,
 792                                   struct ieee80211_tx_info *info)
 793 {
 794         unsigned long pkt_time = STA_LOST_PKT_TIME;
 795         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 796
 797         /* If driver relies on its own algorithm for station kickout, skip
 798          * mac80211 packet loss mechanism.
 799          */
 800         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 801                 return;
 802
 803         /* This packet was aggregated but doesn't carry status info */
 804         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 805             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 806                 return;
 807
 808         sta->deflink.status_stats.lost_packets++;
 809         if (sta->sta.tdls) {
 810                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 811                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 812         }
 813
 814         /*
 815          * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
 816          * of the last packets were lost, and that no ACK was received in the
 817          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 818          * mechanism.
 819          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 820          */
 821         if (sta->deflink.status_stats.lost_packets < pkt_thr ||
 822             !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
 823                 return;
 824
 825         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 826                                     sta->deflink.status_stats.lost_packets,
 827                                     GFP_ATOMIC);
 828         sta->deflink.status_stats.lost_packets = 0;
 829 }
 830
 831 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 832                                   struct ieee80211_tx_info *info,
 833                                   int *retry_count)
 834 {
 835         int count = -1;
 836         int i;
 837
 838         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 839                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 840                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 841                         /* just the first aggr frame carry status info */
 842                         info->status.rates[i].idx = -1;
 843                         info->status.rates[i].count = 0;
 844                         break;
 845                 } else if (info->status.rates[i].idx < 0) {
 846                         break;
 847                 } else if (i >= hw->max_report_rates) {
 848                         /* the HW cannot have attempted that rate */
 849                         info->status.rates[i].idx = -1;
 850                         info->status.rates[i].count = 0;
 851                         break;
 852                 }
 853
 854                 count += info->status.rates[i].count;
 855         }
 856
 857         if (count < 0)
 858                 count = 0;
 859
 860         *retry_count = count;
 861         return i - 1;
 862 }
 863
 864 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 865                           int retry_count, int shift, bool send_to_cooked,
 866                           struct ieee80211_tx_status *status)
 867 {
 868         struct sk_buff *skb2;
 869         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 870         struct ieee80211_sub_if_data *sdata;
 871         struct net_device *prev_dev = NULL;
 872         int rtap_len;
 873
 874         /* send frame to monitor interfaces now */
 875         rtap_len = ieee80211_tx_radiotap_len(info, status);
 876         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 877                 pr_err("ieee80211_tx_status: headroom too small\n");
 878                 dev_kfree_skb(skb);
 879                 return;
 880         }
 881         ieee80211_add_tx_radiotap_header(local, skb, retry_count,
 882                                          rtap_len, shift, status);
 883
 884         /* XXX: is this sufficient for BPF? */
 885         skb_reset_mac_header(skb);
 886         skb->ip_summed = CHECKSUM_UNNECESSARY;
 887         skb->pkt_type = PACKET_OTHERHOST;
 888         skb->protocol = htons(ETH_P_802_2);
 889         memset(skb->cb, 0, sizeof(skb->cb));
 890
 891         rcu_read_lock();
 892         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 893                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 894                         if (!ieee80211_sdata_running(sdata))
 895                                 continue;
 896
 897                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 898                             !send_to_cooked)
 899                                 continue;
 900
 901                         if (prev_dev) {
 902                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 903                                 if (skb2) {
 904                                         skb2->dev = prev_dev;
 905                                         netif_rx(skb2);
 906                                 }
 907                         }
 908
 909                         prev_dev = sdata->dev;
 910                 }
 911         }
 912         if (prev_dev) {
 913                 skb->dev = prev_dev;
 914                 netif_rx(skb);
 915                 skb = NULL;
 916         }
 917         rcu_read_unlock();
 918         dev_kfree_skb(skb);
 919 }
 920
 921 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 922                                   struct ieee80211_tx_status *status,
 923                                   int rates_idx, int retry_count)
 924 {
 925         struct sk_buff *skb = status->skb;
 926         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 927         struct ieee80211_local *local = hw_to_local(hw);
 928         struct ieee80211_tx_info *info = status->info;
 929         struct sta_info *sta;
 930         __le16 fc;
 931         bool send_to_cooked;
 932         bool acked;
 933         bool noack_success;
 934         struct ieee80211_bar *bar;
 935         int shift = 0;
 936         int tid = IEEE80211_NUM_TIDS;
 937
 938         fc = hdr->frame_control;
 939
 940         if (status->sta) {
 941                 sta = container_of(status->sta, struct sta_info, sta);
 942                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 943
 944                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 945                         clear_sta_flag(sta, WLAN_STA_SP);
 946
 947                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 948                 noack_success = !!(info->flags &
 949                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 950
 951                 /* mesh Peer Service Period support */
 952                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 953                     ieee80211_is_data_qos(fc))
 954                         ieee80211_mpsp_trigger_process(
 955                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 956
 957                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 958                     (ieee80211_is_data(hdr->frame_control)) &&
 959                     (rates_idx != -1))
 960                         sta->deflink.tx_stats.last_rate =
 961                                 info->status.rates[rates_idx];
 962
 963                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 964                     (ieee80211_is_data_qos(fc))) {
 965                         u16 ssn;
 966                         u8 *qc;
 967
 968                         qc = ieee80211_get_qos_ctl(hdr);
 969                         tid = qc[0] & 0xf;
 970                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 971                                                 & IEEE80211_SCTL_SEQ);
 972                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 973                                            tid, ssn);
 974                 } else if (ieee80211_is_data_qos(fc)) {
 975                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 976
 977                         tid = qc[0] & 0xf;
 978                 }
 979
 980                 if (!acked && ieee80211_is_back_req(fc)) {
 981                         u16 control;
 982
 983                         /*
 984                          * BAR failed, store the last SSN and retry sending
 985                          * the BAR when the next unicast transmission on the
 986                          * same TID succeeds.
 987                          */
 988                         bar = (struct ieee80211_bar *) skb->data;
 989                         control = le16_to_cpu(bar->control);
 990                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 991                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 992
 993                                 tid = (control &
 994                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 995                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 996
 997                                 ieee80211_set_bar_pending(sta, tid, ssn);
 998                         }
 999                 }
1000
1001                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1002                         ieee80211_handle_filtered_frame(local, sta, skb);
1003                         return;
1004                 } else if (ieee80211_is_data_present(fc)) {
1005                         if (!acked && !noack_success)
1006                                 sta->deflink.status_stats.msdu_failed[tid]++;
1007
1008                         sta->deflink.status_stats.msdu_retries[tid] +=
1009                                 retry_count;
1010                 }
1011
1012                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1013                         ieee80211_frame_acked(sta, skb);
1014
1015         }
1016
1017         /* SNMP counters
1018          * Fragments are passed to low-level drivers as separate skbs, so these
1019          * are actually fragments, not frames. Update frame counters only for
1020          * the first fragment of the frame. */
1021         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1022             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1023                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1024                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1025                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1026                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1027                         if (retry_count > 0)
1028                                 I802_DEBUG_INC(local->dot11RetryCount);
1029                         if (retry_count > 1)
1030                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1031                 }
1032
1033                 /* This counter shall be incremented for an acknowledged MPDU
1034                  * with an individual address in the address 1 field or an MPDU
1035                  * with a multicast address in the address 1 field of type Data
1036                  * or Management. */
1037                 if (!is_multicast_ether_addr(hdr->addr1) ||
1038                     ieee80211_is_data(fc) ||
1039                     ieee80211_is_mgmt(fc))
1040                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1041         } else {
1042                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1043                         I802_DEBUG_INC(local->dot11FailedCount);
1044         }
1045
1046         if (ieee80211_is_any_nullfunc(fc) &&
1047             ieee80211_has_pm(fc) &&
1048             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1049             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1050             local->ps_sdata && !(local->scanning)) {
1051                 if (info->flags & IEEE80211_TX_STAT_ACK)
1052                         local->ps_sdata->u.mgd.flags |=
1053                                         IEEE80211_STA_NULLFUNC_ACKED;
1054                 mod_timer(&local->dynamic_ps_timer,
1055                           jiffies + msecs_to_jiffies(10));
1056         }
1057
1058         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1059
1060         /* this was a transmitted frame, but now we want to reuse it */
1061         skb_orphan(skb);
1062
1063         /* Need to make a copy before skb->cb gets cleared */
1064         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1065                          !(ieee80211_is_data(fc));
1066
1067         /*
1068          * This is a bit racy but we can avoid a lot of work
1069          * with this test...
1070          */
1071         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1072                 if (status->free_list)
1073                         list_add_tail(&skb->list, status->free_list);
1074                 else
1075                         dev_kfree_skb(skb);
1076                 return;
1077         }
1078
1079         /* send to monitor interfaces */
1080         ieee80211_tx_monitor(local, skb, retry_count, shift,
1081                              send_to_cooked, status);
1082 }
1083
1084 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1085 {
1086         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1087         struct ieee80211_local *local = hw_to_local(hw);
1088         struct ieee80211_tx_status status = {
1089                 .skb = skb,
1090                 .info = IEEE80211_SKB_CB(skb),
1091         };
1092         struct sta_info *sta;
1093
1094         rcu_read_lock();
1095
1096         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1097         if (sta)
1098                 status.sta = &sta->sta;
1099
1100         ieee80211_tx_status_ext(hw, &status);
1101         rcu_read_unlock();
1102 }
1103 EXPORT_SYMBOL(ieee80211_tx_status);
1104
1105 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1106                              struct ieee80211_tx_status *status)
1107 {
1108         struct ieee80211_local *local = hw_to_local(hw);
1109         struct ieee80211_tx_info *info = status->info;
1110         struct ieee80211_sta *pubsta = status->sta;
1111         struct sk_buff *skb = status->skb;
1112         struct sta_info *sta = NULL;
1113         int rates_idx, retry_count;
1114         bool acked, noack_success, ack_signal_valid;
1115         u16 tx_time_est;
1116
1117         if (pubsta) {
1118                 sta = container_of(pubsta, struct sta_info, sta);
1119
1120                 if (status->n_rates)
1121                         sta->deflink.tx_stats.last_rate_info =
1122                                 status->rates[status->n_rates - 1].rate_idx;
1123         }
1124
1125         if (skb && (tx_time_est =
1126                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1127                 /* Do this here to avoid the expensive lookup of the sta
1128                  * in ieee80211_report_used_skb().
1129                  */
1130                 ieee80211_sta_update_pending_airtime(local, sta,
1131                                                      skb_get_queue_mapping(skb),
1132                                                      tx_time_est,
1133                                                      true);
1134                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1135         }
1136
1137         if (!status->info)
1138                 goto free;
1139
1140         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1141
1142         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1143         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1144         ack_signal_valid =
1145                 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1146
1147         if (pubsta) {
1148                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1149
1150                 if (!acked && !noack_success)
1151                         sta->deflink.status_stats.retry_failed++;
1152                 sta->deflink.status_stats.retry_count += retry_count;
1153
1154                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1155                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1156                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1157                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1158                                                         acked, info->status.tx_time);
1159
1160                         if (acked) {
1161                                 sta->deflink.status_stats.last_ack = jiffies;
1162
1163                                 if (sta->deflink.status_stats.lost_packets)
1164                                         sta->deflink.status_stats.lost_packets = 0;
1165
1166                                 /* Track when last packet was ACKed */
1167                                 sta->deflink.status_stats.last_pkt_time = jiffies;
1168
1169                                 /* Reset connection monitor */
1170                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1171                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1172                                         sdata->u.mgd.probe_send_count = 0;
1173
1174                                 if (ack_signal_valid) {
1175                                         sta->deflink.status_stats.last_ack_signal =
1176                                                          (s8)info->status.ack_signal;
1177                                         sta->deflink.status_stats.ack_signal_filled = true;
1178                                         ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1179                                                             -info->status.ack_signal);
1180                                 }
1181                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1182                                 /*
1183                                  * The STA is in power save mode, so assume
1184                                  * that this TX packet failed because of that.
1185                                  */
1186                                 if (skb)
1187                                         ieee80211_handle_filtered_frame(local, sta, skb);
1188                                 return;
1189                         } else if (noack_success) {
1190                                 /* nothing to do here, do not account as lost */
1191                         } else {
1192                                 ieee80211_lost_packet(sta, info);
1193                         }
1194                 }
1195
1196                 rate_control_tx_status(local, status);
1197                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1198                         ieee80211s_update_metric(local, sta, status);
1199         }
1200
1201         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1202                 return __ieee80211_tx_status(hw, status, rates_idx,
1203                                              retry_count);
1204
1205         if (acked || noack_success) {
1206                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1207                 if (!pubsta)
1208                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1209                 if (retry_count > 0)
1210                         I802_DEBUG_INC(local->dot11RetryCount);
1211                 if (retry_count > 1)
1212                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1213         } else {
1214                 I802_DEBUG_INC(local->dot11FailedCount);
1215         }
1216
1217 free:
1218         if (!skb)
1219                 return;
1220
1221         ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1222         if (status->free_list)
1223                 list_add_tail(&skb->list, status->free_list);
1224         else
1225                 dev_kfree_skb(skb);
1226 }
1227 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1228
1229 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1230                               struct ieee80211_sta *pubsta,
1231                               struct ieee80211_tx_info *info)
1232 {
1233         struct ieee80211_local *local = hw_to_local(hw);
1234         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1235         struct ieee80211_tx_status status = {
1236                 .info = info,
1237                 .sta = pubsta,
1238         };
1239
1240         rate_control_tx_status(local, &status);
1241
1242         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1243                 sta->deflink.tx_stats.last_rate = info->status.rates[0];
1244 }
1245 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1246
1247 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1248 {
1249         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1250         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1251                                     num_packets, GFP_ATOMIC);
1252 }
1253 EXPORT_SYMBOL(ieee80211_report_low_ack);
1254
1255 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1256 {
1257         struct ieee80211_local *local = hw_to_local(hw);
1258         ktime_t kt = ktime_set(0, 0);
1259
1260         ieee80211_report_used_skb(local, skb, true, kt);
1261         dev_kfree_skb_any(skb);
1262 }
1263 EXPORT_SYMBOL(ieee80211_free_txskb);
1264
1265 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1266                               struct sk_buff_head *skbs)
1267 {
1268         struct sk_buff *skb;
1269
1270         while ((skb = __skb_dequeue(skbs)))
1271                 ieee80211_free_txskb(hw, skb);
1272 }