net/mac80211/status.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  */
   9
  10 #include <linux/export.h>
  11 #include <linux/etherdevice.h>
  12 #include <net/mac80211.h>
  13 #include <asm/unaligned.h>
  14 #include "ieee80211_i.h"
  15 #include "rate.h"
  16 #include "mesh.h"
  17 #include "led.h"
  18 #include "wme.h"
  19
  20
  21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  22                                  struct sk_buff *skb)
  23 {
  24         struct ieee80211_local *local = hw_to_local(hw);
  25         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  26         int tmp;
  27
  28         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  29         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  30                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  31         tmp = skb_queue_len(&local->skb_queue) +
  32                 skb_queue_len(&local->skb_queue_unreliable);
  33         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  34                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  35                 ieee80211_free_txskb(hw, skb);
  36                 tmp--;
  37                 I802_DEBUG_INC(local->tx_status_drop);
  38         }
  39         tasklet_schedule(&local->tasklet);
  40 }
  41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  42
  43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  44                                             struct sta_info *sta,
  45                                             struct sk_buff *skb)
  46 {
  47         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  48         struct ieee80211_hdr *hdr = (void *)skb->data;
  49         int ac;
  50
  51         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  52                            IEEE80211_TX_CTL_AMPDU)) {
  53                 ieee80211_free_txskb(&local->hw, skb);
  54                 return;
  55         }
  56
  57         /*
  58          * This skb 'survived' a round-trip through the driver, and
  59          * hopefully the driver didn't mangle it too badly. However,
  60          * we can definitely not rely on the control information
  61          * being correct. Clear it so we don't get junk there, and
  62          * indicate that it needs new processing, but must not be
  63          * modified/encrypted again.
  64          */
  65         memset(&info->control, 0, sizeof(info->control));
  66
  67         info->control.jiffies = jiffies;
  68         info->control.vif = &sta->sdata->vif;
  69         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
  70         info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
  71         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  72
  73         sta->status_stats.filtered++;
  74
  75         /*
  76          * Clear more-data bit on filtered frames, it might be set
  77          * but later frames might time out so it might have to be
  78          * clear again ... It's all rather unlikely (this frame
  79          * should time out first, right?) but let's not confuse
  80          * peers unnecessarily.
  81          */
  82         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  83                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  84
  85         if (ieee80211_is_data_qos(hdr->frame_control)) {
  86                 u8 *p = ieee80211_get_qos_ctl(hdr);
  87                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  88
  89                 /*
  90                  * Clear EOSP if set, this could happen e.g.
  91                  * if an absence period (us being a P2P GO)
  92                  * shortens the SP.
  93                  */
  94                 if (*p & IEEE80211_QOS_CTL_EOSP)
  95                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  96                 ac = ieee80211_ac_from_tid(tid);
  97         } else {
  98                 ac = IEEE80211_AC_BE;
  99         }
 100
 101         /*
 102          * Clear the TX filter mask for this STA when sending the next
 103          * packet. If the STA went to power save mode, this will happen
 104          * when it wakes up for the next time.
 105          */
 106         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 107         ieee80211_clear_fast_xmit(sta);
 108
 109         /*
 110          * This code races in the following way:
 111          *
 112          *  (1) STA sends frame indicating it will go to sleep and does so
 113          *  (2) hardware/firmware adds STA to filter list, passes frame up
 114          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 115          *  (4) we get TX status before having processed the frame and
 116          *      knowing that the STA has gone to sleep.
 117          *
 118          * This is actually quite unlikely even when both those events are
 119          * processed from interrupts coming in quickly after one another or
 120          * even at the same time because we queue both TX status events and
 121          * RX frames to be processed by a tasklet and process them in the
 122          * same order that they were received or TX status last. Hence, there
 123          * is no race as long as the frame RX is processed before the next TX
 124          * status, which drivers can ensure, see below.
 125          *
 126          * Note that this can only happen if the hardware or firmware can
 127          * actually add STAs to the filter list, if this is done by the
 128          * driver in response to set_tim() (which will only reduce the race
 129          * this whole filtering tries to solve, not completely solve it)
 130          * this situation cannot happen.
 131          *
 132          * To completely solve this race drivers need to make sure that they
 133          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 134          *      functions and
 135          *  (b) always process RX events before TX status events if ordering
 136          *      can be unknown, for example with different interrupt status
 137          *      bits.
 138          *  (c) if PS mode transitions are manual (i.e. the flag
 139          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 140          *      changes before calling TX status events if ordering can be
 141          *      unknown.
 142          */
 143         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 144             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 145                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 146                 sta_info_recalc_tim(sta);
 147
 148                 if (!timer_pending(&local->sta_cleanup))
 149                         mod_timer(&local->sta_cleanup,
 150                                   round_jiffies(jiffies +
 151                                                 STA_INFO_CLEANUP_INTERVAL));
 152                 return;
 153         }
 154
 155         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 156             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 157                 /* Software retry the packet once */
 158                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 159                 ieee80211_add_pending_skb(local, skb);
 160                 return;
 161         }
 162
 163         ps_dbg_ratelimited(sta->sdata,
 164                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 165                            skb_queue_len(&sta->tx_filtered[ac]),
 166                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 167         ieee80211_free_txskb(&local->hw, skb);
 168 }
 169
 170 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 171 {
 172         struct tid_ampdu_tx *tid_tx;
 173
 174         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 175         if (!tid_tx || !tid_tx->bar_pending)
 176                 return;
 177
 178         tid_tx->bar_pending = false;
 179         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 180 }
 181
 182 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 183 {
 184         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 185         struct ieee80211_local *local = sta->local;
 186         struct ieee80211_sub_if_data *sdata = sta->sdata;
 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         if (ieee80211_is_action(mgmt->frame_control) &&
 197             !ieee80211_has_protected(mgmt->frame_control) &&
 198             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 199             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 200             ieee80211_sdata_running(sdata)) {
 201                 enum ieee80211_smps_mode smps_mode;
 202
 203                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 204                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 205                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 206                         break;
 207                 case WLAN_HT_SMPS_CONTROL_STATIC:
 208                         smps_mode = IEEE80211_SMPS_STATIC;
 209                         break;
 210                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 211                 default: /* shouldn't happen since we don't send that */
 212                         smps_mode = IEEE80211_SMPS_OFF;
 213                         break;
 214                 }
 215
 216                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 217                         /*
 218                          * This update looks racy, but isn't -- if we come
 219                          * here we've definitely got a station that we're
 220                          * talking to, and on a managed interface that can
 221                          * only be the AP. And the only other place updating
 222                          * this variable in managed mode is before association.
 223                          */
 224                         sdata->smps_mode = smps_mode;
 225                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 226                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 227                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 228                         sta->known_smps_mode = smps_mode;
 229                 }
 230         }
 231 }
 232
 233 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 234 {
 235         struct tid_ampdu_tx *tid_tx;
 236
 237         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 238         if (!tid_tx)
 239                 return;
 240
 241         tid_tx->failed_bar_ssn = ssn;
 242         tid_tx->bar_pending = true;
 243 }
 244
 245 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 246                                      struct ieee80211_tx_status *status)
 247 {
 248         int len = sizeof(struct ieee80211_radiotap_header);
 249
 250         /* IEEE80211_RADIOTAP_RATE rate */
 251         if (status && status->rate && !(status->rate->flags &
 252                                         (RATE_INFO_FLAGS_MCS |
 253                                          RATE_INFO_FLAGS_DMG |
 254                                          RATE_INFO_FLAGS_EDMG |
 255                                          RATE_INFO_FLAGS_VHT_MCS |
 256                                          RATE_INFO_FLAGS_HE_MCS)))
 257                 len += 2;
 258         else if (info->status.rates[0].idx >= 0 &&
 259                  !(info->status.rates[0].flags &
 260                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 261                 len += 2;
 262
 263         /* IEEE80211_RADIOTAP_TX_FLAGS */
 264         len += 2;
 265
 266         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 267         len += 1;
 268
 269         /* IEEE80211_RADIOTAP_MCS
 270          * IEEE80211_RADIOTAP_VHT */
 271         if (status && status->rate) {
 272                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 273                         len += 3;
 274                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 275                         len = ALIGN(len, 2) + 12;
 276                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 277                         len = ALIGN(len, 2) + 12;
 278         } else if (info->status.rates[0].idx >= 0) {
 279                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 280                         len += 3;
 281                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 282                         len = ALIGN(len, 2) + 12;
 283         }
 284
 285         return len;
 286 }
 287
 288 static void
 289 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 290                                  struct ieee80211_supported_band *sband,
 291                                  struct sk_buff *skb, int retry_count,
 292                                  int rtap_len, int shift,
 293                                  struct ieee80211_tx_status *status)
 294 {
 295         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 296         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 297         struct ieee80211_radiotap_header *rthdr;
 298         unsigned char *pos;
 299         u16 legacy_rate = 0;
 300         u16 txflags;
 301
 302         rthdr = skb_push(skb, rtap_len);
 303
 304         memset(rthdr, 0, rtap_len);
 305         rthdr->it_len = cpu_to_le16(rtap_len);
 306         rthdr->it_present =
 307                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 308                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 309         pos = (unsigned char *)(rthdr + 1);
 310
 311         /*
 312          * XXX: Once radiotap gets the bitmap reset thing the vendor
 313          *      extensions proposal contains, we can actually report
 314          *      the whole set of tries we did.
 315          */
 316
 317         /* IEEE80211_RADIOTAP_RATE */
 318
 319         if (status && status->rate) {
 320                 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 321                                              RATE_INFO_FLAGS_DMG |
 322                                              RATE_INFO_FLAGS_EDMG |
 323                                              RATE_INFO_FLAGS_VHT_MCS |
 324                                              RATE_INFO_FLAGS_HE_MCS)))
 325                         legacy_rate = status->rate->legacy;
 326         } else if (info->status.rates[0].idx >= 0 &&
 327                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 328                                                   IEEE80211_TX_RC_VHT_MCS)))
 329                 legacy_rate =
 330                         sband->bitrates[info->status.rates[0].idx].bitrate;
 331
 332         if (legacy_rate) {
 333                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 334                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 335                 /* padding for tx flags */
 336                 pos += 2;
 337         }
 338
 339         /* IEEE80211_RADIOTAP_TX_FLAGS */
 340         txflags = 0;
 341         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 342             !is_multicast_ether_addr(hdr->addr1))
 343                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 344
 345         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 346                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 347         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 348                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 349
 350         put_unaligned_le16(txflags, pos);
 351         pos += 2;
 352
 353         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 354         /* for now report the total retry_count */
 355         *pos = retry_count;
 356         pos++;
 357
 358         if (status && status->rate &&
 359             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 360                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 361                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 362                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 363                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 364                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 365                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 366                 if (status->rate->bw == RATE_INFO_BW_40)
 367                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 368                 pos[2] = status->rate->mcs;
 369                 pos += 3;
 370         } else if (status && status->rate &&
 371                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 372                 u16 known = local->hw.radiotap_vht_details &
 373                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 374                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 375
 376                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 377
 378                 /* required alignment from rthdr */
 379                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 380
 381                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 382                 put_unaligned_le16(known, pos);
 383                 pos += 2;
 384
 385                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 386                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 387                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 388                 pos++;
 389
 390                 /* u8 bandwidth */
 391                 switch (status->rate->bw) {
 392                 case RATE_INFO_BW_160:
 393                         *pos = 11;
 394                         break;
 395                 case RATE_INFO_BW_80:
 396                         *pos = 4;
 397                         break;
 398                 case RATE_INFO_BW_40:
 399                         *pos = 1;
 400                         break;
 401                 default:
 402                         *pos = 0;
 403                         break;
 404                 }
 405                 pos++;
 406
 407                 /* u8 mcs_nss[4] */
 408                 *pos = (status->rate->mcs << 4) | status->rate->nss;
 409                 pos += 4;
 410
 411                 /* u8 coding */
 412                 pos++;
 413                 /* u8 group_id */
 414                 pos++;
 415                 /* u16 partial_aid */
 416                 pos += 2;
 417         } else if (status && status->rate &&
 418                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 419                 struct ieee80211_radiotap_he *he;
 420
 421                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 422
 423                 /* required alignment from rthdr */
 424                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 425                 he = (struct ieee80211_radiotap_he *)pos;
 426
 427                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 428                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 429                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 430                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 431
 432                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 433
 434 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 435
 436                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 437
 438 #define CHECK_GI(s) \
 439         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 440         (int)NL80211_RATE_INFO_HE_GI_##s)
 441
 442                 CHECK_GI(0_8);
 443                 CHECK_GI(1_6);
 444                 CHECK_GI(3_2);
 445
 446                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 447                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 448
 449                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 450
 451                 switch (status->rate->bw) {
 452                 case RATE_INFO_BW_20:
 453                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 454                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 455                         break;
 456                 case RATE_INFO_BW_40:
 457                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 458                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 459                         break;
 460                 case RATE_INFO_BW_80:
 461                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 462                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 463                         break;
 464                 case RATE_INFO_BW_160:
 465                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 466                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 467                         break;
 468                 case RATE_INFO_BW_HE_RU:
 469 #define CHECK_RU_ALLOC(s) \
 470         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 471         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 472
 473                         CHECK_RU_ALLOC(26);
 474                         CHECK_RU_ALLOC(52);
 475                         CHECK_RU_ALLOC(106);
 476                         CHECK_RU_ALLOC(242);
 477                         CHECK_RU_ALLOC(484);
 478                         CHECK_RU_ALLOC(996);
 479                         CHECK_RU_ALLOC(2x996);
 480
 481                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 482                                              status->rate->he_ru_alloc + 4);
 483                         break;
 484                 default:
 485                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 486                 }
 487
 488                 pos += sizeof(struct ieee80211_radiotap_he);
 489         }
 490
 491         if ((status && status->rate) || info->status.rates[0].idx < 0)
 492                 return;
 493
 494         /* IEEE80211_RADIOTAP_MCS
 495          * IEEE80211_RADIOTAP_VHT */
 496         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 497                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 498                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 499                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 500                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 501                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 502                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 503                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 504                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 505                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 506                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 507                 pos[2] = info->status.rates[0].idx;
 508                 pos += 3;
 509         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 510                 u16 known = local->hw.radiotap_vht_details &
 511                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 512                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 513
 514                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 515
 516                 /* required alignment from rthdr */
 517                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 518
 519                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 520                 put_unaligned_le16(known, pos);
 521                 pos += 2;
 522
 523                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 524                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 526                 pos++;
 527
 528                 /* u8 bandwidth */
 529                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 530                         *pos = 1;
 531                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 532                         *pos = 4;
 533                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 534                         *pos = 11;
 535                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 536                         *pos = 0;
 537                 pos++;
 538
 539                 /* u8 mcs_nss[4] */
 540                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 541                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 542                 pos += 4;
 543
 544                 /* u8 coding */
 545                 pos++;
 546                 /* u8 group_id */
 547                 pos++;
 548                 /* u16 partial_aid */
 549                 pos += 2;
 550         }
 551 }
 552
 553 /*
 554  * Handles the tx for TDLS teardown frames.
 555  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 556  */
 557 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 558                                         struct ieee80211_sub_if_data *sdata,
 559                                         struct sk_buff *skb, u32 flags)
 560 {
 561         struct sk_buff *teardown_skb;
 562         struct sk_buff *orig_teardown_skb;
 563         bool is_teardown = false;
 564
 565         /* Get the teardown data we need and free the lock */
 566         spin_lock(&sdata->u.mgd.teardown_lock);
 567         teardown_skb = sdata->u.mgd.teardown_skb;
 568         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 569         if ((skb == orig_teardown_skb) && teardown_skb) {
 570                 sdata->u.mgd.teardown_skb = NULL;
 571                 sdata->u.mgd.orig_teardown_skb = NULL;
 572                 is_teardown = true;
 573         }
 574         spin_unlock(&sdata->u.mgd.teardown_lock);
 575
 576         if (is_teardown) {
 577                 /* This mechanism relies on being able to get ACKs */
 578                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 579
 580                 /* Check if peer has ACKed */
 581                 if (flags & IEEE80211_TX_STAT_ACK) {
 582                         dev_kfree_skb_any(teardown_skb);
 583                 } else {
 584                         tdls_dbg(sdata,
 585                                  "TDLS Resending teardown through AP\n");
 586
 587                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 588                 }
 589         }
 590 }
 591
 592 static struct ieee80211_sub_if_data *
 593 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 594 {
 595         struct ieee80211_sub_if_data *sdata;
 596
 597         if (skb->dev) {
 598                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 599                         if (!sdata->dev)
 600                                 continue;
 601
 602                         if (skb->dev == sdata->dev)
 603                                 return sdata;
 604                 }
 605
 606                 return NULL;
 607         }
 608
 609         return rcu_dereference(local->p2p_sdata);
 610 }
 611
 612 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 613                                      struct ieee80211_tx_info *info,
 614                                      bool acked, bool dropped)
 615 {
 616         struct sk_buff *skb;
 617         unsigned long flags;
 618
 619         spin_lock_irqsave(&local->ack_status_lock, flags);
 620         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 621         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 622
 623         if (!skb)
 624                 return;
 625
 626         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 627                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 628                 struct ieee80211_sub_if_data *sdata;
 629                 struct ieee80211_hdr *hdr = (void *)skb->data;
 630                 __be16 ethertype = 0;
 631
 632                 if (skb->len >= ETH_HLEN && skb->protocol == cpu_to_be16(ETH_P_802_3))
 633                         skb_copy_bits(skb, 2 * ETH_ALEN, &ethertype, ETH_TLEN);
 634
 635                 rcu_read_lock();
 636                 sdata = ieee80211_sdata_from_skb(local, skb);
 637                 if (sdata) {
 638                         if (ethertype == sdata->control_port_protocol ||
 639                             ethertype == cpu_to_be16(ETH_P_PREAUTH))
 640                                 cfg80211_control_port_tx_status(&sdata->wdev,
 641                                                                 cookie,
 642                                                                 skb->data,
 643                                                                 skb->len,
 644                                                                 acked,
 645                                                                 GFP_ATOMIC);
 646                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 647                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 648                                                       cookie, acked,
 649                                                       info->status.ack_signal,
 650                                                       info->status.is_valid_ack_signal,
 651                                                       GFP_ATOMIC);
 652                         else if (ieee80211_is_mgmt(hdr->frame_control))
 653                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 654                                                         skb->data, skb->len,
 655                                                         acked, GFP_ATOMIC);
 656                         else
 657                                 pr_warn("Unknown status report in ack skb\n");
 658
 659                 }
 660                 rcu_read_unlock();
 661
 662                 dev_kfree_skb_any(skb);
 663         } else if (dropped) {
 664                 dev_kfree_skb_any(skb);
 665         } else {
 666                 /* consumes skb */
 667                 skb_complete_wifi_ack(skb, acked);
 668         }
 669 }
 670
 671 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 672                                       struct sk_buff *skb, bool dropped)
 673 {
 674         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 675         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 676         struct ieee80211_hdr *hdr = (void *)skb->data;
 677         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 678
 679         if (dropped)
 680                 acked = false;
 681
 682         if (tx_time_est) {
 683                 struct sta_info *sta;
 684
 685                 rcu_read_lock();
 686
 687                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 688                 ieee80211_sta_update_pending_airtime(local, sta,
 689                                                      skb_get_queue_mapping(skb),
 690                                                      tx_time_est,
 691                                                      true);
 692                 rcu_read_unlock();
 693         }
 694
 695         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 696                 struct ieee80211_sub_if_data *sdata;
 697
 698                 rcu_read_lock();
 699
 700                 sdata = ieee80211_sdata_from_skb(local, skb);
 701
 702                 if (!sdata) {
 703                         skb->dev = NULL;
 704                 } else {
 705                         unsigned int hdr_size =
 706                                 ieee80211_hdrlen(hdr->frame_control);
 707
 708                         /* Check to see if packet is a TDLS teardown packet */
 709                         if (ieee80211_is_data(hdr->frame_control) &&
 710                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 711                              WLAN_TDLS_TEARDOWN))
 712                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 713                                                             info->flags);
 714                         else
 715                                 ieee80211_mgd_conn_tx_status(sdata,
 716                                                              hdr->frame_control,
 717                                                              acked);
 718                 }
 719
 720                 rcu_read_unlock();
 721         } else if (info->ack_frame_id) {
 722                 ieee80211_report_ack_skb(local, info, acked, dropped);
 723         }
 724
 725         if (!dropped && skb->destructor) {
 726                 skb->wifi_acked_valid = 1;
 727                 skb->wifi_acked = acked;
 728         }
 729
 730         ieee80211_led_tx(local);
 731
 732         if (skb_has_frag_list(skb)) {
 733                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 734                 skb_shinfo(skb)->frag_list = NULL;
 735         }
 736 }
 737
 738 /*
 739  * Use a static threshold for now, best value to be determined
 740  * by testing ...
 741  * Should it depend on:
 742  *  - on # of retransmissions
 743  *  - current throughput (higher value for higher tpt)?
 744  */
 745 #define STA_LOST_PKT_THRESHOLD  50
 746 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 747 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 748 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 749
 750 static void ieee80211_lost_packet(struct sta_info *sta,
 751                                   struct ieee80211_tx_info *info)
 752 {
 753         unsigned long pkt_time = STA_LOST_PKT_TIME;
 754         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 755
 756         /* If driver relies on its own algorithm for station kickout, skip
 757          * mac80211 packet loss mechanism.
 758          */
 759         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 760                 return;
 761
 762         /* This packet was aggregated but doesn't carry status info */
 763         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 764             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 765                 return;
 766
 767         sta->status_stats.lost_packets++;
 768         if (sta->sta.tdls) {
 769                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 770                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 771         }
 772
 773         /*
 774          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 775          * of the last packets were lost, and that no ACK was received in the
 776          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 777          * mechanism.
 778          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 779          */
 780         if (sta->status_stats.lost_packets < pkt_thr ||
 781             !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
 782                 return;
 783
 784         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 785                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 786         sta->status_stats.lost_packets = 0;
 787 }
 788
 789 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 790                                   struct ieee80211_tx_info *info,
 791                                   int *retry_count)
 792 {
 793         int count = -1;
 794         int i;
 795
 796         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 797                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 798                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 799                         /* just the first aggr frame carry status info */
 800                         info->status.rates[i].idx = -1;
 801                         info->status.rates[i].count = 0;
 802                         break;
 803                 } else if (info->status.rates[i].idx < 0) {
 804                         break;
 805                 } else if (i >= hw->max_report_rates) {
 806                         /* the HW cannot have attempted that rate */
 807                         info->status.rates[i].idx = -1;
 808                         info->status.rates[i].count = 0;
 809                         break;
 810                 }
 811
 812                 count += info->status.rates[i].count;
 813         }
 814
 815         if (count < 0)
 816                 count = 0;
 817
 818         *retry_count = count;
 819         return i - 1;
 820 }
 821
 822 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 823                           struct ieee80211_supported_band *sband,
 824                           int retry_count, int shift, bool send_to_cooked,
 825                           struct ieee80211_tx_status *status)
 826 {
 827         struct sk_buff *skb2;
 828         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 829         struct ieee80211_sub_if_data *sdata;
 830         struct net_device *prev_dev = NULL;
 831         int rtap_len;
 832
 833         /* send frame to monitor interfaces now */
 834         rtap_len = ieee80211_tx_radiotap_len(info, status);
 835         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 836                 pr_err("ieee80211_tx_status: headroom too small\n");
 837                 dev_kfree_skb(skb);
 838                 return;
 839         }
 840         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 841                                          rtap_len, shift, status);
 842
 843         /* XXX: is this sufficient for BPF? */
 844         skb_reset_mac_header(skb);
 845         skb->ip_summed = CHECKSUM_UNNECESSARY;
 846         skb->pkt_type = PACKET_OTHERHOST;
 847         skb->protocol = htons(ETH_P_802_2);
 848         memset(skb->cb, 0, sizeof(skb->cb));
 849
 850         rcu_read_lock();
 851         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 852                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 853                         if (!ieee80211_sdata_running(sdata))
 854                                 continue;
 855
 856                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 857                             !send_to_cooked)
 858                                 continue;
 859
 860                         if (prev_dev) {
 861                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 862                                 if (skb2) {
 863                                         skb2->dev = prev_dev;
 864                                         netif_rx(skb2);
 865                                 }
 866                         }
 867
 868                         prev_dev = sdata->dev;
 869                 }
 870         }
 871         if (prev_dev) {
 872                 skb->dev = prev_dev;
 873                 netif_rx(skb);
 874                 skb = NULL;
 875         }
 876         rcu_read_unlock();
 877         dev_kfree_skb(skb);
 878 }
 879
 880 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 881                                   struct ieee80211_tx_status *status,
 882                                   int rates_idx, int retry_count)
 883 {
 884         struct sk_buff *skb = status->skb;
 885         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 886         struct ieee80211_local *local = hw_to_local(hw);
 887         struct ieee80211_tx_info *info = status->info;
 888         struct sta_info *sta;
 889         __le16 fc;
 890         struct ieee80211_supported_band *sband;
 891         bool send_to_cooked;
 892         bool acked;
 893         bool noack_success;
 894         struct ieee80211_bar *bar;
 895         int shift = 0;
 896         int tid = IEEE80211_NUM_TIDS;
 897
 898         sband = local->hw.wiphy->bands[info->band];
 899         fc = hdr->frame_control;
 900
 901         if (status->sta) {
 902                 sta = container_of(status->sta, struct sta_info, sta);
 903                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 904
 905                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 906                         clear_sta_flag(sta, WLAN_STA_SP);
 907
 908                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 909                 noack_success = !!(info->flags &
 910                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 911
 912                 /* mesh Peer Service Period support */
 913                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 914                     ieee80211_is_data_qos(fc))
 915                         ieee80211_mpsp_trigger_process(
 916                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 917
 918                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 919                         /*
 920                          * The STA is in power save mode, so assume
 921                          * that this TX packet failed because of that.
 922                          */
 923                         ieee80211_handle_filtered_frame(local, sta, skb);
 924                         return;
 925                 }
 926
 927                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 928                     (ieee80211_is_data(hdr->frame_control)) &&
 929                     (rates_idx != -1))
 930                         sta->tx_stats.last_rate =
 931                                 info->status.rates[rates_idx];
 932
 933                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 934                     (ieee80211_is_data_qos(fc))) {
 935                         u16 ssn;
 936                         u8 *qc;
 937
 938                         qc = ieee80211_get_qos_ctl(hdr);
 939                         tid = qc[0] & 0xf;
 940                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 941                                                 & IEEE80211_SCTL_SEQ);
 942                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 943                                            tid, ssn);
 944                 } else if (ieee80211_is_data_qos(fc)) {
 945                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 946
 947                         tid = qc[0] & 0xf;
 948                 }
 949
 950                 if (!acked && ieee80211_is_back_req(fc)) {
 951                         u16 control;
 952
 953                         /*
 954                          * BAR failed, store the last SSN and retry sending
 955                          * the BAR when the next unicast transmission on the
 956                          * same TID succeeds.
 957                          */
 958                         bar = (struct ieee80211_bar *) skb->data;
 959                         control = le16_to_cpu(bar->control);
 960                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 961                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 962
 963                                 tid = (control &
 964                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 965                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 966
 967                                 ieee80211_set_bar_pending(sta, tid, ssn);
 968                         }
 969                 }
 970
 971                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 972                         ieee80211_handle_filtered_frame(local, sta, skb);
 973                         return;
 974                 } else if (ieee80211_is_data_present(fc)) {
 975                         if (!acked && !noack_success)
 976                                 sta->status_stats.msdu_failed[tid]++;
 977
 978                         sta->status_stats.msdu_retries[tid] +=
 979                                 retry_count;
 980                 }
 981
 982                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 983                         ieee80211_frame_acked(sta, skb);
 984
 985         }
 986
 987         /* SNMP counters
 988          * Fragments are passed to low-level drivers as separate skbs, so these
 989          * are actually fragments, not frames. Update frame counters only for
 990          * the first fragment of the frame. */
 991         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
 992             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
 993                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
 994                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
 995                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 996                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
 997                         if (retry_count > 0)
 998                                 I802_DEBUG_INC(local->dot11RetryCount);
 999                         if (retry_count > 1)
1000                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1001                 }
1002
1003                 /* This counter shall be incremented for an acknowledged MPDU
1004                  * with an individual address in the address 1 field or an MPDU
1005                  * with a multicast address in the address 1 field of type Data
1006                  * or Management. */
1007                 if (!is_multicast_ether_addr(hdr->addr1) ||
1008                     ieee80211_is_data(fc) ||
1009                     ieee80211_is_mgmt(fc))
1010                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1011         } else {
1012                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1013                         I802_DEBUG_INC(local->dot11FailedCount);
1014         }
1015
1016         if (ieee80211_is_any_nullfunc(fc) &&
1017             ieee80211_has_pm(fc) &&
1018             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1019             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1020             local->ps_sdata && !(local->scanning)) {
1021                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1022                         local->ps_sdata->u.mgd.flags |=
1023                                         IEEE80211_STA_NULLFUNC_ACKED;
1024                 } else
1025                         mod_timer(&local->dynamic_ps_timer, jiffies +
1026                                         msecs_to_jiffies(10));
1027         }
1028
1029         ieee80211_report_used_skb(local, skb, false);
1030
1031         /* this was a transmitted frame, but now we want to reuse it */
1032         skb_orphan(skb);
1033
1034         /* Need to make a copy before skb->cb gets cleared */
1035         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1036                          !(ieee80211_is_data(fc));
1037
1038         /*
1039          * This is a bit racy but we can avoid a lot of work
1040          * with this test...
1041          */
1042         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1043                 if (status->free_list)
1044                         list_add_tail(&skb->list, status->free_list);
1045                 else
1046                         dev_kfree_skb(skb);
1047                 return;
1048         }
1049
1050         /* send to monitor interfaces */
1051         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1052                              send_to_cooked, status);
1053 }
1054
1055 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1056 {
1057         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1058         struct ieee80211_local *local = hw_to_local(hw);
1059         struct ieee80211_tx_status status = {
1060                 .skb = skb,
1061                 .info = IEEE80211_SKB_CB(skb),
1062         };
1063         struct sta_info *sta;
1064
1065         rcu_read_lock();
1066
1067         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1068         if (sta)
1069                 status.sta = &sta->sta;
1070
1071         ieee80211_tx_status_ext(hw, &status);
1072         rcu_read_unlock();
1073 }
1074 EXPORT_SYMBOL(ieee80211_tx_status);
1075
1076 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1077                              struct ieee80211_tx_status *status)
1078 {
1079         struct ieee80211_local *local = hw_to_local(hw);
1080         struct ieee80211_tx_info *info = status->info;
1081         struct ieee80211_sta *pubsta = status->sta;
1082         struct sk_buff *skb = status->skb;
1083         struct ieee80211_supported_band *sband;
1084         struct sta_info *sta = NULL;
1085         int rates_idx, retry_count;
1086         bool acked, noack_success;
1087         u16 tx_time_est;
1088
1089         if (pubsta) {
1090                 sta = container_of(pubsta, struct sta_info, sta);
1091
1092                 if (status->rate)
1093                         sta->tx_stats.last_rate_info = *status->rate;
1094         }
1095
1096         if (skb && (tx_time_est =
1097                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1098                 /* Do this here to avoid the expensive lookup of the sta
1099                  * in ieee80211_report_used_skb().
1100                  */
1101                 ieee80211_sta_update_pending_airtime(local, sta,
1102                                                      skb_get_queue_mapping(skb),
1103                                                      tx_time_est,
1104                                                      true);
1105                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1106         }
1107
1108         if (!status->info)
1109                 goto free;
1110
1111         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1112
1113         sband = hw->wiphy->bands[info->band];
1114
1115         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1116         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1117
1118         if (pubsta) {
1119                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1120
1121                 if (!acked && !noack_success)
1122                         sta->status_stats.retry_failed++;
1123                 sta->status_stats.retry_count += retry_count;
1124
1125                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1126                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1127                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1128                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1129                                                         acked, info->status.tx_time);
1130
1131                         if (acked) {
1132                                 sta->status_stats.last_ack = jiffies;
1133
1134                                 if (sta->status_stats.lost_packets)
1135                                         sta->status_stats.lost_packets = 0;
1136
1137                                 /* Track when last packet was ACKed */
1138                                 sta->status_stats.last_pkt_time = jiffies;
1139
1140                                 /* Reset connection monitor */
1141                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1142                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1143                                         sdata->u.mgd.probe_send_count = 0;
1144
1145                                 if (info->status.is_valid_ack_signal) {
1146                                         sta->status_stats.last_ack_signal =
1147                                                          (s8)info->status.ack_signal;
1148                                         sta->status_stats.ack_signal_filled = true;
1149                                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
1150                                                             -info->status.ack_signal);
1151                                 }
1152                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1153                                 return;
1154                         } else if (noack_success) {
1155                                 /* nothing to do here, do not account as lost */
1156                         } else {
1157                                 ieee80211_lost_packet(sta, info);
1158                         }
1159                 }
1160
1161                 rate_control_tx_status(local, sband, status);
1162                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1163                         ieee80211s_update_metric(local, sta, status);
1164         }
1165
1166         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1167                 return __ieee80211_tx_status(hw, status, rates_idx,
1168                                              retry_count);
1169
1170         if (acked || noack_success) {
1171                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1172                 if (!pubsta)
1173                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1174                 if (retry_count > 0)
1175                         I802_DEBUG_INC(local->dot11RetryCount);
1176                 if (retry_count > 1)
1177                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1178         } else {
1179                 I802_DEBUG_INC(local->dot11FailedCount);
1180         }
1181
1182 free:
1183         if (!skb)
1184                 return;
1185
1186         ieee80211_report_used_skb(local, skb, false);
1187         if (status->free_list)
1188                 list_add_tail(&skb->list, status->free_list);
1189         else
1190                 dev_kfree_skb(skb);
1191 }
1192 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1193
1194 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1195                               struct ieee80211_sta *pubsta,
1196                               struct ieee80211_tx_info *info)
1197 {
1198         struct ieee80211_local *local = hw_to_local(hw);
1199         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1200         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1201         struct ieee80211_tx_status status = {
1202                 .info = info,
1203                 .sta = pubsta,
1204         };
1205
1206         rate_control_tx_status(local, sband, &status);
1207
1208         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1209                 sta->tx_stats.last_rate = info->status.rates[0];
1210 }
1211 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1212
1213 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1214                               struct ieee80211_vif *vif,
1215                               struct sk_buff *skb)
1216 {
1217         struct ieee80211_sub_if_data *sdata;
1218         struct ieee80211_tx_status status = {
1219                 .skb = skb,
1220                 .info = IEEE80211_SKB_CB(skb),
1221         };
1222         struct sta_info *sta;
1223
1224         sdata = vif_to_sdata(vif);
1225
1226         rcu_read_lock();
1227
1228         if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1229                 status.sta = &sta->sta;
1230
1231         ieee80211_tx_status_ext(hw, &status);
1232
1233         rcu_read_unlock();
1234 }
1235 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1236
1237 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1238 {
1239         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1240         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1241                                     num_packets, GFP_ATOMIC);
1242 }
1243 EXPORT_SYMBOL(ieee80211_report_low_ack);
1244
1245 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1246 {
1247         struct ieee80211_local *local = hw_to_local(hw);
1248
1249         ieee80211_report_used_skb(local, skb, true);
1250         dev_kfree_skb_any(skb);
1251 }
1252 EXPORT_SYMBOL(ieee80211_free_txskb);
1253
1254 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1255                               struct sk_buff_head *skbs)
1256 {
1257         struct sk_buff *skb;
1258
1259         while ((skb = __skb_dequeue(skbs)))
1260                 ieee80211_free_txskb(hw, skb);
1261 }