net/mac80211/agg-rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HT handling
   4  *
   5  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   6  * Copyright 2002-2005, Instant802 Networks, Inc.
   7  * Copyright 2005-2006, Devicescape Software, Inc.
   8  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   9  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  10  * Copyright 2007-2010, Intel Corporation
  11  * Copyright(c) 2015-2017 Intel Deutschland GmbH
  12  * Copyright (C) 2018-2020 Intel Corporation
  13  */
  14
  15 /**
  16  * DOC: RX A-MPDU aggregation
  17  *
  18  * Aggregation on the RX side requires only implementing the
  19  * @ampdu_action callback that is invoked to start/stop any
  20  * block-ack sessions for RX aggregation.
  21  *
  22  * When RX aggregation is started by the peer, the driver is
  23  * notified via @ampdu_action function, with the
  24  * %IEEE80211_AMPDU_RX_START action, and may reject the request
  25  * in which case a negative response is sent to the peer, if it
  26  * accepts it a positive response is sent.
  27  *
  28  * While the session is active, the device/driver are required
  29  * to de-aggregate frames and pass them up one by one to mac80211,
  30  * which will handle the reorder buffer.
  31  *
  32  * When the aggregation session is stopped again by the peer or
  33  * ourselves, the driver's @ampdu_action function will be called
  34  * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the
  35  * call must not fail.
  36  */
  37
  38 #include <linux/ieee80211.h>
  39 #include <linux/slab.h>
  40 #include <linux/export.h>
  41 #include <net/mac80211.h>
  42 #include "ieee80211_i.h"
  43 #include "driver-ops.h"
  44
  45 static void ieee80211_free_tid_rx(struct rcu_head *h)
  46 {
  47         struct tid_ampdu_rx *tid_rx =
  48                 container_of(h, struct tid_ampdu_rx, rcu_head);
  49         int i;
  50
  51         for (i = 0; i < tid_rx->buf_size; i++)
  52                 __skb_queue_purge(&tid_rx->reorder_buf[i]);
  53         kfree(tid_rx->reorder_buf);
  54         kfree(tid_rx->reorder_time);
  55         kfree(tid_rx);
  56 }
  57
  58 void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
  59                                      u16 initiator, u16 reason, bool tx)
  60 {
  61         struct ieee80211_local *local = sta->local;
  62         struct tid_ampdu_rx *tid_rx;
  63         struct ieee80211_ampdu_params params = {
  64                 .sta = &sta->sta,
  65                 .action = IEEE80211_AMPDU_RX_STOP,
  66                 .tid = tid,
  67                 .amsdu = false,
  68                 .timeout = 0,
  69                 .ssn = 0,
  70         };
  71
  72         lockdep_assert_held(&sta->ampdu_mlme.mtx);
  73
  74         tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
  75                                         lockdep_is_held(&sta->ampdu_mlme.mtx));
  76
  77         if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid))
  78                 return;
  79
  80         RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
  81         __clear_bit(tid, sta->ampdu_mlme.agg_session_valid);
  82
  83         ht_dbg(sta->sdata,
  84                "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
  85                sta->sta.addr, tid,
  86                initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator",
  87                (int)reason);
  88
  89         if (drv_ampdu_action(local, sta->sdata, &params))
  90                 sdata_info(sta->sdata,
  91                            "HW problem - can not stop rx aggregation for %pM tid %d\n",
  92                            sta->sta.addr, tid);
  93
  94         /* check if this is a self generated aggregation halt */
  95         if (initiator == WLAN_BACK_RECIPIENT && tx)
  96                 ieee80211_send_delba(sta->sdata, sta->sta.addr,
  97                                      tid, WLAN_BACK_RECIPIENT, reason);
  98
  99         /*
 100          * return here in case tid_rx is not assigned - which will happen if
 101          * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set.
 102          */
 103         if (!tid_rx)
 104                 return;
 105
 106         del_timer_sync(&tid_rx->session_timer);
 107
 108         /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
 109         spin_lock_bh(&tid_rx->reorder_lock);
 110         tid_rx->removed = true;
 111         spin_unlock_bh(&tid_rx->reorder_lock);
 112         del_timer_sync(&tid_rx->reorder_timer);
 113
 114         call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
 115 }
 116
 117 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
 118                                     u16 initiator, u16 reason, bool tx)
 119 {
 120         mutex_lock(&sta->ampdu_mlme.mtx);
 121         ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
 122         mutex_unlock(&sta->ampdu_mlme.mtx);
 123 }
 124
 125 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
 126                                   const u8 *addr)
 127 {
 128         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 129         struct sta_info *sta;
 130         int i;
 131
 132         rcu_read_lock();
 133         sta = sta_info_get_bss(sdata, addr);
 134         if (!sta) {
 135                 rcu_read_unlock();
 136                 return;
 137         }
 138
 139         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 140                 if (ba_rx_bitmap & BIT(i))
 141                         set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
 142
 143         ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
 144         rcu_read_unlock();
 145 }
 146 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
 147
 148 /*
 149  * After accepting the AddBA Request we activated a timer,
 150  * resetting it after each frame that arrives from the originator.
 151  */
 152 static void sta_rx_agg_session_timer_expired(struct timer_list *t)
 153 {
 154         struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer);
 155         struct sta_info *sta = tid_rx->sta;
 156         u8 tid = tid_rx->tid;
 157         unsigned long timeout;
 158
 159         timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
 160         if (time_is_after_jiffies(timeout)) {
 161                 mod_timer(&tid_rx->session_timer, timeout);
 162                 return;
 163         }
 164
 165         ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
 166                sta->sta.addr, tid);
 167
 168         set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired);
 169         ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
 170 }
 171
 172 static void sta_rx_agg_reorder_timer_expired(struct timer_list *t)
 173 {
 174         struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer);
 175
 176         rcu_read_lock();
 177         ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid);
 178         rcu_read_unlock();
 179 }
 180
 181 static void ieee80211_add_addbaext(struct ieee80211_sub_if_data *sdata,
 182                                    struct sk_buff *skb,
 183                                    const struct ieee80211_addba_ext_ie *req)
 184 {
 185         struct ieee80211_supported_band *sband;
 186         struct ieee80211_addba_ext_ie *resp;
 187         const struct ieee80211_sta_he_cap *he_cap;
 188         u8 frag_level, cap_frag_level;
 189         u8 *pos;
 190
 191         sband = ieee80211_get_sband(sdata);
 192         if (!sband)
 193                 return;
 194         he_cap = ieee80211_get_he_iftype_cap(sband, sdata->vif.type);
 195         if (!he_cap)
 196                 return;
 197
 198         pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie));
 199         *pos++ = WLAN_EID_ADDBA_EXT;
 200         *pos++ = sizeof(struct ieee80211_addba_ext_ie);
 201         resp = (struct ieee80211_addba_ext_ie *)pos;
 202         resp->data = req->data & IEEE80211_ADDBA_EXT_NO_FRAG;
 203
 204         frag_level = u32_get_bits(req->data,
 205                                   IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK);
 206         cap_frag_level = u32_get_bits(he_cap->he_cap_elem.mac_cap_info[0],
 207                                       IEEE80211_HE_MAC_CAP0_DYNAMIC_FRAG_MASK);
 208         if (frag_level > cap_frag_level)
 209                 frag_level = cap_frag_level;
 210         resp->data |= u8_encode_bits(frag_level,
 211                                      IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK);
 212 }
 213
 214 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid,
 215                                       u8 dialog_token, u16 status, u16 policy,
 216                                       u16 buf_size, u16 timeout,
 217                                       const struct ieee80211_addba_ext_ie *addbaext)
 218 {
 219         struct ieee80211_sub_if_data *sdata = sta->sdata;
 220         struct ieee80211_local *local = sdata->local;
 221         struct sk_buff *skb;
 222         struct ieee80211_mgmt *mgmt;
 223         bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU);
 224         u16 capab;
 225
 226         skb = dev_alloc_skb(sizeof(*mgmt) +
 227                     2 + sizeof(struct ieee80211_addba_ext_ie) +
 228                     local->hw.extra_tx_headroom);
 229         if (!skb)
 230                 return;
 231
 232         skb_reserve(skb, local->hw.extra_tx_headroom);
 233         mgmt = skb_put_zero(skb, 24);
 234         memcpy(mgmt->da, da, ETH_ALEN);
 235         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 236         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 237             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 238             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 239                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 240         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 241                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 242         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 243                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 244
 245         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 246                                           IEEE80211_STYPE_ACTION);
 247
 248         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
 249         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 250         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
 251         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
 252
 253         capab = (u16)(amsdu << 0);      /* bit 0 A-MSDU support */
 254         capab |= (u16)(policy << 1);    /* bit 1 aggregation policy */
 255         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
 256         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
 257
 258         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
 259         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
 260         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
 261
 262         if (sta->sta.he_cap.has_he && addbaext)
 263                 ieee80211_add_addbaext(sdata, skb, addbaext);
 264
 265         ieee80211_tx_skb(sdata, skb);
 266 }
 267
 268 void ___ieee80211_start_rx_ba_session(struct sta_info *sta,
 269                                       u8 dialog_token, u16 timeout,
 270                                       u16 start_seq_num, u16 ba_policy, u16 tid,
 271                                       u16 buf_size, bool tx, bool auto_seq,
 272                                       const struct ieee80211_addba_ext_ie *addbaext)
 273 {
 274         struct ieee80211_local *local = sta->sdata->local;
 275         struct tid_ampdu_rx *tid_agg_rx;
 276         struct ieee80211_ampdu_params params = {
 277                 .sta = &sta->sta,
 278                 .action = IEEE80211_AMPDU_RX_START,
 279                 .tid = tid,
 280                 .amsdu = false,
 281                 .timeout = timeout,
 282                 .ssn = start_seq_num,
 283         };
 284         int i, ret = -EOPNOTSUPP;
 285         u16 status = WLAN_STATUS_REQUEST_DECLINED;
 286         u16 max_buf_size;
 287
 288         if (tid >= IEEE80211_FIRST_TSPEC_TSID) {
 289                 ht_dbg(sta->sdata,
 290                        "STA %pM requests BA session on unsupported tid %d\n",
 291                        sta->sta.addr, tid);
 292                 goto end;
 293         }
 294
 295         if (!sta->sta.ht_cap.ht_supported &&
 296             sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ) {
 297                 ht_dbg(sta->sdata,
 298                        "STA %pM erroneously requests BA session on tid %d w/o QoS\n",
 299                        sta->sta.addr, tid);
 300                 /* send a response anyway, it's an error case if we get here */
 301                 goto end;
 302         }
 303
 304         if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
 305                 ht_dbg(sta->sdata,
 306                        "Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
 307                        sta->sta.addr, tid);
 308                 goto end;
 309         }
 310
 311         if (sta->sta.he_cap.has_he)
 312                 max_buf_size = IEEE80211_MAX_AMPDU_BUF;
 313         else
 314                 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT;
 315
 316         /* sanity check for incoming parameters:
 317          * check if configuration can support the BA policy
 318          * and if buffer size does not exceeds max value */
 319         /* XXX: check own ht delayed BA capability?? */
 320         if (((ba_policy != 1) &&
 321              (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
 322             (buf_size > max_buf_size)) {
 323                 status = WLAN_STATUS_INVALID_QOS_PARAM;
 324                 ht_dbg_ratelimited(sta->sdata,
 325                                    "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
 326                                    sta->sta.addr, tid, ba_policy, buf_size);
 327                 goto end;
 328         }
 329         /* determine default buffer size */
 330         if (buf_size == 0)
 331                 buf_size = max_buf_size;
 332
 333         /* make sure the size doesn't exceed the maximum supported by the hw */
 334         if (buf_size > sta->sta.max_rx_aggregation_subframes)
 335                 buf_size = sta->sta.max_rx_aggregation_subframes;
 336         params.buf_size = buf_size;
 337
 338         ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n",
 339                buf_size, sta->sta.addr);
 340
 341         /* examine state machine */
 342         lockdep_assert_held(&sta->ampdu_mlme.mtx);
 343
 344         if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) {
 345                 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) {
 346                         struct tid_ampdu_rx *tid_rx;
 347
 348                         ht_dbg_ratelimited(sta->sdata,
 349                                            "updated AddBA Req from %pM on tid %u\n",
 350                                            sta->sta.addr, tid);
 351                         /* We have no API to update the timeout value in the
 352                          * driver so reject the timeout update if the timeout
 353                          * changed. If it did not change, i.e., no real update,
 354                          * just reply with success.
 355                          */
 356                         rcu_read_lock();
 357                         tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 358                         if (tid_rx && tid_rx->timeout == timeout)
 359                                 status = WLAN_STATUS_SUCCESS;
 360                         else
 361                                 status = WLAN_STATUS_REQUEST_DECLINED;
 362                         rcu_read_unlock();
 363                         goto end;
 364                 }
 365
 366                 ht_dbg_ratelimited(sta->sdata,
 367                                    "unexpected AddBA Req from %pM on tid %u\n",
 368                                    sta->sta.addr, tid);
 369
 370                 /* delete existing Rx BA session on the same tid */
 371                 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
 372                                                 WLAN_STATUS_UNSPECIFIED_QOS,
 373                                                 false);
 374         }
 375
 376         if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) {
 377                 ret = drv_ampdu_action(local, sta->sdata, &params);
 378                 ht_dbg(sta->sdata,
 379                        "Rx A-MPDU request on %pM tid %d result %d\n",
 380                        sta->sta.addr, tid, ret);
 381                 if (!ret)
 382                         status = WLAN_STATUS_SUCCESS;
 383                 goto end;
 384         }
 385
 386         /* prepare A-MPDU MLME for Rx aggregation */
 387         tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL);
 388         if (!tid_agg_rx)
 389                 goto end;
 390
 391         spin_lock_init(&tid_agg_rx->reorder_lock);
 392
 393         /* rx timer */
 394         timer_setup(&tid_agg_rx->session_timer,
 395                     sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE);
 396
 397         /* rx reorder timer */
 398         timer_setup(&tid_agg_rx->reorder_timer,
 399                     sta_rx_agg_reorder_timer_expired, 0);
 400
 401         /* prepare reordering buffer */
 402         tid_agg_rx->reorder_buf =
 403                 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL);
 404         tid_agg_rx->reorder_time =
 405                 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
 406         if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
 407                 kfree(tid_agg_rx->reorder_buf);
 408                 kfree(tid_agg_rx->reorder_time);
 409                 kfree(tid_agg_rx);
 410                 goto end;
 411         }
 412
 413         for (i = 0; i < buf_size; i++)
 414                 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);
 415
 416         ret = drv_ampdu_action(local, sta->sdata, &params);
 417         ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
 418                sta->sta.addr, tid, ret);
 419         if (ret) {
 420                 kfree(tid_agg_rx->reorder_buf);
 421                 kfree(tid_agg_rx->reorder_time);
 422                 kfree(tid_agg_rx);
 423                 goto end;
 424         }
 425
 426         /* update data */
 427         tid_agg_rx->ssn = start_seq_num;
 428         tid_agg_rx->head_seq_num = start_seq_num;
 429         tid_agg_rx->buf_size = buf_size;
 430         tid_agg_rx->timeout = timeout;
 431         tid_agg_rx->stored_mpdu_num = 0;
 432         tid_agg_rx->auto_seq = auto_seq;
 433         tid_agg_rx->started = false;
 434         tid_agg_rx->reorder_buf_filtered = 0;
 435         tid_agg_rx->tid = tid;
 436         tid_agg_rx->sta = sta;
 437         status = WLAN_STATUS_SUCCESS;
 438
 439         /* activate it for RX */
 440         rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
 441
 442         if (timeout) {
 443                 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
 444                 tid_agg_rx->last_rx = jiffies;
 445         }
 446
 447 end:
 448         if (status == WLAN_STATUS_SUCCESS) {
 449                 __set_bit(tid, sta->ampdu_mlme.agg_session_valid);
 450                 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg);
 451                 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token;
 452         }
 453
 454         if (tx)
 455                 ieee80211_send_addba_resp(sta, sta->sta.addr, tid,
 456                                           dialog_token, status, 1, buf_size,
 457                                           timeout, addbaext);
 458 }
 459
 460 static void __ieee80211_start_rx_ba_session(struct sta_info *sta,
 461                                             u8 dialog_token, u16 timeout,
 462                                             u16 start_seq_num, u16 ba_policy,
 463                                             u16 tid, u16 buf_size, bool tx,
 464                                             bool auto_seq,
 465                                             const struct ieee80211_addba_ext_ie *addbaext)
 466 {
 467         mutex_lock(&sta->ampdu_mlme.mtx);
 468         ___ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
 469                                          start_seq_num, ba_policy, tid,
 470                                          buf_size, tx, auto_seq, addbaext);
 471         mutex_unlock(&sta->ampdu_mlme.mtx);
 472 }
 473
 474 void ieee80211_process_addba_request(struct ieee80211_local *local,
 475                                      struct sta_info *sta,
 476                                      struct ieee80211_mgmt *mgmt,
 477                                      size_t len)
 478 {
 479         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
 480         struct ieee802_11_elems elems = { };
 481         u8 dialog_token;
 482         int ies_len;
 483
 484         /* extract session parameters from addba request frame */
 485         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
 486         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
 487         start_seq_num =
 488                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
 489
 490         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
 491         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
 492         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
 493         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
 494
 495         ies_len = len - offsetof(struct ieee80211_mgmt,
 496                                  u.action.u.addba_req.variable);
 497         if (ies_len) {
 498                 ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable,
 499                                 ies_len, true, &elems, mgmt->bssid, NULL);
 500                 if (elems.parse_error)
 501                         return;
 502         }
 503
 504         __ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
 505                                         start_seq_num, ba_policy, tid,
 506                                         buf_size, true, false,
 507                                         elems.addba_ext_ie);
 508 }
 509
 510 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif,
 511                                  const u8 *addr, unsigned int tid)
 512 {
 513         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 514         struct ieee80211_local *local = sdata->local;
 515         struct sta_info *sta;
 516
 517         rcu_read_lock();
 518         sta = sta_info_get_bss(sdata, addr);
 519         if (!sta)
 520                 goto unlock;
 521
 522         set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl);
 523         ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
 524  unlock:
 525         rcu_read_unlock();
 526 }
 527 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl);
 528
 529 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif,
 530                                    const u8 *addr, unsigned int tid)
 531 {
 532         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 533         struct ieee80211_local *local = sdata->local;
 534         struct sta_info *sta;
 535
 536         rcu_read_lock();
 537         sta = sta_info_get_bss(sdata, addr);
 538         if (!sta)
 539                 goto unlock;
 540
 541         set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired);
 542         ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
 543
 544  unlock:
 545         rcu_read_unlock();
 546 }
 547 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired);