| 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 - 2023 Intel Corporation |
| 13 | */ |
| 14 | |
| 15 | #include <linux/ieee80211.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/export.h> |
| 18 | #include <net/mac80211.h> |
| 19 | #include "ieee80211_i.h" |
| 20 | #include "driver-ops.h" |
| 21 | #include "wme.h" |
| 22 | |
| 23 | /** |
| 24 | * DOC: TX A-MPDU aggregation |
| 25 | * |
| 26 | * Aggregation on the TX side requires setting the hardware flag |
| 27 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
| 28 | * packets with a flag indicating A-MPDU aggregation. The driver |
| 29 | * or device is responsible for actually aggregating the frames, |
| 30 | * as well as deciding how many and which to aggregate. |
| 31 | * |
| 32 | * When TX aggregation is started by some subsystem (usually the rate |
| 33 | * control algorithm would be appropriate) by calling the |
| 34 | * ieee80211_start_tx_ba_session() function, the driver will be |
| 35 | * notified via its @ampdu_action function, with the |
| 36 | * %IEEE80211_AMPDU_TX_START action. |
| 37 | * |
| 38 | * In response to that, the driver is later required to call the |
| 39 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
| 40 | * start the aggregation session after the peer has also responded. |
| 41 | * If the peer responds negatively, the session will be stopped |
| 42 | * again right away. Note that it is possible for the aggregation |
| 43 | * session to be stopped before the driver has indicated that it |
| 44 | * is done setting it up, in which case it must not indicate the |
| 45 | * setup completion. |
| 46 | * |
| 47 | * Also note that, since we also need to wait for a response from |
| 48 | * the peer, the driver is notified of the completion of the |
| 49 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the |
| 50 | * @ampdu_action callback. |
| 51 | * |
| 52 | * Similarly, when the aggregation session is stopped by the peer |
| 53 | * or something calling ieee80211_stop_tx_ba_session(), the driver's |
| 54 | * @ampdu_action function will be called with the action |
| 55 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, |
| 56 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). |
| 57 | * Note that the sta can get destroyed before the BA tear down is |
| 58 | * complete. |
| 59 | */ |
| 60 | |
| 61 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
| 62 | const u8 *da, u16 tid, |
| 63 | u8 dialog_token, u16 start_seq_num, |
| 64 | u16 agg_size, u16 timeout) |
| 65 | { |
| 66 | struct ieee80211_local *local = sdata->local; |
| 67 | struct sk_buff *skb; |
| 68 | struct ieee80211_mgmt *mgmt; |
| 69 | u16 capab; |
| 70 | |
| 71 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| 72 | |
| 73 | if (!skb) |
| 74 | return; |
| 75 | |
| 76 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 77 | mgmt = skb_put_zero(skb, 24); |
| 78 | memcpy(mgmt->da, da, ETH_ALEN); |
| 79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
| 80 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
| 81 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
| 82 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
| 83 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
| 84 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| 85 | memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); |
| 86 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| 87 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); |
| 88 | |
| 89 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 90 | IEEE80211_STYPE_ACTION); |
| 91 | |
| 92 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); |
| 93 | |
| 94 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| 95 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
| 96 | |
| 97 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
| 98 | capab = IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
| 99 | capab |= IEEE80211_ADDBA_PARAM_POLICY_MASK; |
| 100 | capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); |
| 101 | capab |= u16_encode_bits(agg_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); |
| 102 | |
| 103 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
| 104 | |
| 105 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
| 106 | mgmt->u.action.u.addba_req.start_seq_num = |
| 107 | cpu_to_le16(start_seq_num << 4); |
| 108 | |
| 109 | ieee80211_tx_skb_tid(sdata, skb, tid, -1); |
| 110 | } |
| 111 | |
| 112 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
| 113 | { |
| 114 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 115 | struct ieee80211_local *local = sdata->local; |
| 116 | struct sk_buff *skb; |
| 117 | struct ieee80211_bar *bar; |
| 118 | u16 bar_control = 0; |
| 119 | |
| 120 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
| 121 | if (!skb) |
| 122 | return; |
| 123 | |
| 124 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 125 | bar = skb_put_zero(skb, sizeof(*bar)); |
| 126 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
| 127 | IEEE80211_STYPE_BACK_REQ); |
| 128 | memcpy(bar->ra, ra, ETH_ALEN); |
| 129 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
| 130 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
| 131 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
| 132 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
| 133 | bar->control = cpu_to_le16(bar_control); |
| 134 | bar->start_seq_num = cpu_to_le16(ssn); |
| 135 | |
| 136 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
| 137 | IEEE80211_TX_CTL_REQ_TX_STATUS; |
| 138 | ieee80211_tx_skb_tid(sdata, skb, tid, -1); |
| 139 | } |
| 140 | EXPORT_SYMBOL(ieee80211_send_bar); |
| 141 | |
| 142 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
| 143 | struct tid_ampdu_tx *tid_tx) |
| 144 | { |
| 145 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 146 | lockdep_assert_held(&sta->lock); |
| 147 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * When multiple aggregation sessions on multiple stations |
| 152 | * are being created/destroyed simultaneously, we need to |
| 153 | * refcount the global queue stop caused by that in order |
| 154 | * to not get into a situation where one of the aggregation |
| 155 | * setup or teardown re-enables queues before the other is |
| 156 | * ready to handle that. |
| 157 | * |
| 158 | * These two functions take care of this issue by keeping |
| 159 | * a global "agg_queue_stop" refcount. |
| 160 | */ |
| 161 | static void __acquires(agg_queue) |
| 162 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| 163 | { |
| 164 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 165 | |
| 166 | /* we do refcounting here, so don't use the queue reason refcounting */ |
| 167 | |
| 168 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
| 169 | ieee80211_stop_queue_by_reason( |
| 170 | &sdata->local->hw, queue, |
| 171 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| 172 | false); |
| 173 | __acquire(agg_queue); |
| 174 | } |
| 175 | |
| 176 | static void __releases(agg_queue) |
| 177 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| 178 | { |
| 179 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 180 | |
| 181 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) |
| 182 | ieee80211_wake_queue_by_reason( |
| 183 | &sdata->local->hw, queue, |
| 184 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| 185 | false); |
| 186 | __release(agg_queue); |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | ieee80211_agg_stop_txq(struct sta_info *sta, int tid) |
| 191 | { |
| 192 | struct ieee80211_txq *txq = sta->sta.txq[tid]; |
| 193 | struct ieee80211_sub_if_data *sdata; |
| 194 | struct fq *fq; |
| 195 | struct txq_info *txqi; |
| 196 | |
| 197 | if (!txq) |
| 198 | return; |
| 199 | |
| 200 | txqi = to_txq_info(txq); |
| 201 | sdata = vif_to_sdata(txq->vif); |
| 202 | fq = &sdata->local->fq; |
| 203 | |
| 204 | /* Lock here to protect against further seqno updates on dequeue */ |
| 205 | spin_lock_bh(&fq->lock); |
| 206 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
| 207 | spin_unlock_bh(&fq->lock); |
| 208 | } |
| 209 | |
| 210 | static void |
| 211 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) |
| 212 | { |
| 213 | struct ieee80211_txq *txq = sta->sta.txq[tid]; |
| 214 | struct txq_info *txqi; |
| 215 | |
| 216 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 217 | |
| 218 | if (!txq) |
| 219 | return; |
| 220 | |
| 221 | txqi = to_txq_info(txq); |
| 222 | |
| 223 | if (enable) |
| 224 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
| 225 | else |
| 226 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
| 227 | |
| 228 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
| 229 | local_bh_disable(); |
| 230 | rcu_read_lock(); |
| 231 | schedule_and_wake_txq(sta->sdata->local, txqi); |
| 232 | rcu_read_unlock(); |
| 233 | local_bh_enable(); |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * splice packets from the STA's pending to the local pending, |
| 238 | * requires a call to ieee80211_agg_splice_finish later |
| 239 | */ |
| 240 | static void __acquires(agg_queue) |
| 241 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, |
| 242 | struct tid_ampdu_tx *tid_tx, u16 tid) |
| 243 | { |
| 244 | struct ieee80211_local *local = sdata->local; |
| 245 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| 246 | unsigned long flags; |
| 247 | |
| 248 | ieee80211_stop_queue_agg(sdata, tid); |
| 249 | |
| 250 | if (WARN(!tid_tx, |
| 251 | "TID %d gone but expected when splicing aggregates from the pending queue\n", |
| 252 | tid)) |
| 253 | return; |
| 254 | |
| 255 | if (!skb_queue_empty(&tid_tx->pending)) { |
| 256 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| 257 | /* copy over remaining packets */ |
| 258 | skb_queue_splice_tail_init(&tid_tx->pending, |
| 259 | &local->pending[queue]); |
| 260 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | static void __releases(agg_queue) |
| 265 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) |
| 266 | { |
| 267 | ieee80211_wake_queue_agg(sdata, tid); |
| 268 | } |
| 269 | |
| 270 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) |
| 271 | { |
| 272 | struct tid_ampdu_tx *tid_tx; |
| 273 | |
| 274 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 275 | lockdep_assert_held(&sta->lock); |
| 276 | |
| 277 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 278 | |
| 279 | /* |
| 280 | * When we get here, the TX path will not be lockless any more wrt. |
| 281 | * aggregation, since the OPERATIONAL bit has long been cleared. |
| 282 | * Thus it will block on getting the lock, if it occurs. So if we |
| 283 | * stop the queue now, we will not get any more packets, and any |
| 284 | * that might be being processed will wait for us here, thereby |
| 285 | * guaranteeing that no packets go to the tid_tx pending queue any |
| 286 | * more. |
| 287 | */ |
| 288 | |
| 289 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
| 290 | |
| 291 | /* future packets must not find the tid_tx struct any more */ |
| 292 | ieee80211_assign_tid_tx(sta, tid, NULL); |
| 293 | |
| 294 | ieee80211_agg_splice_finish(sta->sdata, tid); |
| 295 | |
| 296 | kfree_rcu(tid_tx, rcu_head); |
| 297 | } |
| 298 | |
| 299 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| 300 | enum ieee80211_agg_stop_reason reason) |
| 301 | { |
| 302 | struct ieee80211_local *local = sta->local; |
| 303 | struct tid_ampdu_tx *tid_tx; |
| 304 | struct ieee80211_ampdu_params params = { |
| 305 | .sta = &sta->sta, |
| 306 | .tid = tid, |
| 307 | .buf_size = 0, |
| 308 | .amsdu = false, |
| 309 | .timeout = 0, |
| 310 | .ssn = 0, |
| 311 | }; |
| 312 | int ret; |
| 313 | |
| 314 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 315 | |
| 316 | switch (reason) { |
| 317 | case AGG_STOP_DECLINED: |
| 318 | case AGG_STOP_LOCAL_REQUEST: |
| 319 | case AGG_STOP_PEER_REQUEST: |
| 320 | params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
| 321 | break; |
| 322 | case AGG_STOP_DESTROY_STA: |
| 323 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
| 324 | break; |
| 325 | default: |
| 326 | WARN_ON_ONCE(1); |
| 327 | return -EINVAL; |
| 328 | } |
| 329 | |
| 330 | spin_lock_bh(&sta->lock); |
| 331 | |
| 332 | /* free struct pending for start, if present */ |
| 333 | tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; |
| 334 | kfree(tid_tx); |
| 335 | sta->ampdu_mlme.tid_start_tx[tid] = NULL; |
| 336 | |
| 337 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 338 | if (!tid_tx) { |
| 339 | spin_unlock_bh(&sta->lock); |
| 340 | return -ENOENT; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * if we're already stopping ignore any new requests to stop |
| 345 | * unless we're destroying it in which case notify the driver |
| 346 | */ |
| 347 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 348 | spin_unlock_bh(&sta->lock); |
| 349 | if (reason != AGG_STOP_DESTROY_STA) |
| 350 | return -EALREADY; |
| 351 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
| 352 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| 353 | WARN_ON_ONCE(ret); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
| 358 | /* not even started yet! */ |
| 359 | ieee80211_assign_tid_tx(sta, tid, NULL); |
| 360 | spin_unlock_bh(&sta->lock); |
| 361 | kfree_rcu(tid_tx, rcu_head); |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
| 366 | |
| 367 | ieee80211_agg_stop_txq(sta, tid); |
| 368 | |
| 369 | spin_unlock_bh(&sta->lock); |
| 370 | |
| 371 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
| 372 | sta->sta.addr, tid); |
| 373 | |
| 374 | del_timer_sync(&tid_tx->addba_resp_timer); |
| 375 | del_timer_sync(&tid_tx->session_timer); |
| 376 | |
| 377 | /* |
| 378 | * After this packets are no longer handed right through |
| 379 | * to the driver but are put onto tid_tx->pending instead, |
| 380 | * with locking to ensure proper access. |
| 381 | */ |
| 382 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| 383 | |
| 384 | /* |
| 385 | * There might be a few packets being processed right now (on |
| 386 | * another CPU) that have already gotten past the aggregation |
| 387 | * check when it was still OPERATIONAL and consequently have |
| 388 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might |
| 389 | * call into the driver at the same time or even before the |
| 390 | * TX paths calls into it, which could confuse the driver. |
| 391 | * |
| 392 | * Wait for all currently running TX paths to finish before |
| 393 | * telling the driver. New packets will not go through since |
| 394 | * the aggregation session is no longer OPERATIONAL. |
| 395 | */ |
| 396 | if (!local->in_reconfig) |
| 397 | synchronize_net(); |
| 398 | |
| 399 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
| 400 | WLAN_BACK_RECIPIENT : |
| 401 | WLAN_BACK_INITIATOR; |
| 402 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; |
| 403 | |
| 404 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| 405 | |
| 406 | /* HW shall not deny going back to legacy */ |
| 407 | if (WARN_ON(ret)) { |
| 408 | /* |
| 409 | * We may have pending packets get stuck in this case... |
| 410 | * Not bothering with a workaround for now. |
| 411 | */ |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * In the case of AGG_STOP_DESTROY_STA, the driver won't |
| 416 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may |
| 417 | * seem like we can leave the tid_tx data pending forever. |
| 418 | * This is true, in a way, but "forever" is only until the |
| 419 | * station struct is actually destroyed. In the meantime, |
| 420 | * leaving it around ensures that we don't transmit packets |
| 421 | * to the driver on this TID which might confuse it. |
| 422 | */ |
| 423 | |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * After sending add Block Ack request we activated a timer until |
| 429 | * add Block Ack response will arrive from the recipient. |
| 430 | * If this timer expires sta_addba_resp_timer_expired will be executed. |
| 431 | */ |
| 432 | static void sta_addba_resp_timer_expired(struct timer_list *t) |
| 433 | { |
| 434 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer); |
| 435 | struct sta_info *sta = tid_tx->sta; |
| 436 | u8 tid = tid_tx->tid; |
| 437 | |
| 438 | /* check if the TID waits for addBA response */ |
| 439 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
| 440 | ht_dbg(sta->sdata, |
| 441 | "timer expired on %pM tid %d not expecting addBA response\n", |
| 442 | sta->sta.addr, tid); |
| 443 | return; |
| 444 | } |
| 445 | |
| 446 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
| 447 | sta->sta.addr, tid); |
| 448 | |
| 449 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| 450 | } |
| 451 | |
| 452 | static void ieee80211_send_addba_with_timeout(struct sta_info *sta, |
| 453 | struct tid_ampdu_tx *tid_tx) |
| 454 | { |
| 455 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 456 | struct ieee80211_local *local = sta->local; |
| 457 | u8 tid = tid_tx->tid; |
| 458 | u16 buf_size; |
| 459 | |
| 460 | if (WARN_ON_ONCE(test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state) || |
| 461 | test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))) |
| 462 | return; |
| 463 | |
| 464 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 465 | |
| 466 | /* activate the timer for the recipient's addBA response */ |
| 467 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); |
| 468 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
| 469 | sta->sta.addr, tid); |
| 470 | |
| 471 | spin_lock_bh(&sta->lock); |
| 472 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
| 473 | sta->ampdu_mlme.addba_req_num[tid]++; |
| 474 | spin_unlock_bh(&sta->lock); |
| 475 | |
| 476 | if (sta->sta.deflink.he_cap.has_he) { |
| 477 | buf_size = local->hw.max_tx_aggregation_subframes; |
| 478 | } else { |
| 479 | /* |
| 480 | * We really should use what the driver told us it will |
| 481 | * transmit as the maximum, but certain APs (e.g. the |
| 482 | * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012) |
| 483 | * will crash when we use a lower number. |
| 484 | */ |
| 485 | buf_size = IEEE80211_MAX_AMPDU_BUF_HT; |
| 486 | } |
| 487 | |
| 488 | /* send AddBA request */ |
| 489 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, |
| 490 | tid_tx->dialog_token, tid_tx->ssn, |
| 491 | buf_size, tid_tx->timeout); |
| 492 | |
| 493 | WARN_ON(test_and_set_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)); |
| 494 | } |
| 495 | |
| 496 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
| 497 | { |
| 498 | struct tid_ampdu_tx *tid_tx; |
| 499 | struct ieee80211_local *local = sta->local; |
| 500 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 501 | struct ieee80211_ampdu_params params = { |
| 502 | .sta = &sta->sta, |
| 503 | .action = IEEE80211_AMPDU_TX_START, |
| 504 | .tid = tid, |
| 505 | .buf_size = 0, |
| 506 | .amsdu = false, |
| 507 | .timeout = 0, |
| 508 | }; |
| 509 | int ret; |
| 510 | |
| 511 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 512 | |
| 513 | /* |
| 514 | * Start queuing up packets for this aggregation session. |
| 515 | * We're going to release them once the driver is OK with |
| 516 | * that. |
| 517 | */ |
| 518 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| 519 | |
| 520 | /* |
| 521 | * Make sure no packets are being processed. This ensures that |
| 522 | * we have a valid starting sequence number and that in-flight |
| 523 | * packets have been flushed out and no packets for this TID |
| 524 | * will go into the driver during the ampdu_action call. |
| 525 | */ |
| 526 | synchronize_net(); |
| 527 | |
| 528 | params.ssn = sta->tid_seq[tid] >> 4; |
| 529 | ret = drv_ampdu_action(local, sdata, ¶ms); |
| 530 | tid_tx->ssn = params.ssn; |
| 531 | if (ret == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) { |
| 532 | return; |
| 533 | } else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) { |
| 534 | /* |
| 535 | * We didn't send the request yet, so don't need to check |
| 536 | * here if we already got a response, just mark as driver |
| 537 | * ready immediately. |
| 538 | */ |
| 539 | set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state); |
| 540 | } else if (ret) { |
| 541 | ht_dbg(sdata, |
| 542 | "BA request denied - HW unavailable for %pM tid %d\n", |
| 543 | sta->sta.addr, tid); |
| 544 | spin_lock_bh(&sta->lock); |
| 545 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
| 546 | ieee80211_assign_tid_tx(sta, tid, NULL); |
| 547 | ieee80211_agg_splice_finish(sdata, tid); |
| 548 | spin_unlock_bh(&sta->lock); |
| 549 | |
| 550 | ieee80211_agg_start_txq(sta, tid, false); |
| 551 | |
| 552 | kfree_rcu(tid_tx, rcu_head); |
| 553 | return; |
| 554 | } |
| 555 | |
| 556 | ieee80211_send_addba_with_timeout(sta, tid_tx); |
| 557 | } |
| 558 | |
| 559 | void ieee80211_refresh_tx_agg_session_timer(struct ieee80211_sta *pubsta, |
| 560 | u16 tid) |
| 561 | { |
| 562 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 563 | struct tid_ampdu_tx *tid_tx; |
| 564 | |
| 565 | if (WARN_ON_ONCE(tid >= IEEE80211_NUM_TIDS)) |
| 566 | return; |
| 567 | |
| 568 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); |
| 569 | if (!tid_tx) |
| 570 | return; |
| 571 | |
| 572 | tid_tx->last_tx = jiffies; |
| 573 | } |
| 574 | EXPORT_SYMBOL(ieee80211_refresh_tx_agg_session_timer); |
| 575 | |
| 576 | /* |
| 577 | * After accepting the AddBA Response we activated a timer, |
| 578 | * resetting it after each frame that we send. |
| 579 | */ |
| 580 | static void sta_tx_agg_session_timer_expired(struct timer_list *t) |
| 581 | { |
| 582 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer); |
| 583 | struct sta_info *sta = tid_tx->sta; |
| 584 | u8 tid = tid_tx->tid; |
| 585 | unsigned long timeout; |
| 586 | |
| 587 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 588 | return; |
| 589 | } |
| 590 | |
| 591 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); |
| 592 | if (time_is_after_jiffies(timeout)) { |
| 593 | mod_timer(&tid_tx->session_timer, timeout); |
| 594 | return; |
| 595 | } |
| 596 | |
| 597 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
| 598 | sta->sta.addr, tid); |
| 599 | |
| 600 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| 601 | } |
| 602 | |
| 603 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| 604 | u16 timeout) |
| 605 | { |
| 606 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 607 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 608 | struct ieee80211_local *local = sdata->local; |
| 609 | struct tid_ampdu_tx *tid_tx; |
| 610 | int ret = 0; |
| 611 | |
| 612 | trace_api_start_tx_ba_session(pubsta, tid); |
| 613 | |
| 614 | if (WARN(sta->reserved_tid == tid, |
| 615 | "Requested to start BA session on reserved tid=%d", tid)) |
| 616 | return -EINVAL; |
| 617 | |
| 618 | if (!pubsta->deflink.ht_cap.ht_supported && |
| 619 | sta->sdata->vif.bss_conf.chanreq.oper.chan->band != NL80211_BAND_6GHZ) |
| 620 | return -EINVAL; |
| 621 | |
| 622 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
| 623 | return -EINVAL; |
| 624 | |
| 625 | if ((tid >= IEEE80211_NUM_TIDS) || |
| 626 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
| 627 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) |
| 628 | return -EINVAL; |
| 629 | |
| 630 | if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
| 631 | return -EINVAL; |
| 632 | |
| 633 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
| 634 | pubsta->addr, tid); |
| 635 | |
| 636 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| 637 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
| 638 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| 639 | sdata->vif.type != NL80211_IFTYPE_AP && |
| 640 | sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| 641 | return -EINVAL; |
| 642 | |
| 643 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
| 644 | ht_dbg(sdata, |
| 645 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
| 646 | sta->sta.addr, tid); |
| 647 | return -EINVAL; |
| 648 | } |
| 649 | |
| 650 | if (test_sta_flag(sta, WLAN_STA_MFP) && |
| 651 | !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { |
| 652 | ht_dbg(sdata, |
| 653 | "MFP STA not authorized - deny BA session request %pM tid %d\n", |
| 654 | sta->sta.addr, tid); |
| 655 | return -EINVAL; |
| 656 | } |
| 657 | |
| 658 | /* |
| 659 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a |
| 660 | * member of an IBSS, and has no other existing Block Ack agreement |
| 661 | * with the recipient STA, then the initiating STA shall transmit a |
| 662 | * Probe Request frame to the recipient STA and shall not transmit an |
| 663 | * ADDBA Request frame unless it receives a Probe Response frame |
| 664 | * from the recipient within dot11ADDBAFailureTimeout. |
| 665 | * |
| 666 | * The probe request mechanism for ADDBA is currently not implemented, |
| 667 | * but we only build up Block Ack session with HT STAs. This information |
| 668 | * is set when we receive a bss info from a probe response or a beacon. |
| 669 | */ |
| 670 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && |
| 671 | !sta->sta.deflink.ht_cap.ht_supported) { |
| 672 | ht_dbg(sdata, |
| 673 | "BA request denied - IBSS STA %pM does not advertise HT support\n", |
| 674 | pubsta->addr); |
| 675 | return -EINVAL; |
| 676 | } |
| 677 | |
| 678 | spin_lock_bh(&sta->lock); |
| 679 | |
| 680 | /* we have tried too many times, receiver does not want A-MPDU */ |
| 681 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { |
| 682 | ret = -EBUSY; |
| 683 | goto err_unlock_sta; |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * if we have tried more than HT_AGG_BURST_RETRIES times we |
| 688 | * will spread our requests in time to avoid stalling connection |
| 689 | * for too long |
| 690 | */ |
| 691 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && |
| 692 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + |
| 693 | HT_AGG_RETRIES_PERIOD)) { |
| 694 | ht_dbg(sdata, |
| 695 | "BA request denied - %d failed requests on %pM tid %u\n", |
| 696 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); |
| 697 | ret = -EBUSY; |
| 698 | goto err_unlock_sta; |
| 699 | } |
| 700 | |
| 701 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 702 | /* check if the TID is not in aggregation flow already */ |
| 703 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
| 704 | ht_dbg(sdata, |
| 705 | "BA request denied - session is not idle on %pM tid %u\n", |
| 706 | sta->sta.addr, tid); |
| 707 | ret = -EAGAIN; |
| 708 | goto err_unlock_sta; |
| 709 | } |
| 710 | |
| 711 | /* prepare A-MPDU MLME for Tx aggregation */ |
| 712 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| 713 | if (!tid_tx) { |
| 714 | ret = -ENOMEM; |
| 715 | goto err_unlock_sta; |
| 716 | } |
| 717 | |
| 718 | skb_queue_head_init(&tid_tx->pending); |
| 719 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| 720 | |
| 721 | tid_tx->timeout = timeout; |
| 722 | tid_tx->sta = sta; |
| 723 | tid_tx->tid = tid; |
| 724 | |
| 725 | /* response timer */ |
| 726 | timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0); |
| 727 | |
| 728 | /* tx timer */ |
| 729 | timer_setup(&tid_tx->session_timer, |
| 730 | sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE); |
| 731 | |
| 732 | /* assign a dialog token */ |
| 733 | sta->ampdu_mlme.dialog_token_allocator++; |
| 734 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
| 735 | |
| 736 | /* |
| 737 | * Finally, assign it to the start array; the work item will |
| 738 | * collect it and move it to the normal array. |
| 739 | */ |
| 740 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; |
| 741 | |
| 742 | wiphy_work_queue(local->hw.wiphy, &sta->ampdu_mlme.work); |
| 743 | |
| 744 | /* this flow continues off the work */ |
| 745 | err_unlock_sta: |
| 746 | spin_unlock_bh(&sta->lock); |
| 747 | return ret; |
| 748 | } |
| 749 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| 750 | |
| 751 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| 752 | struct sta_info *sta, u16 tid) |
| 753 | { |
| 754 | struct tid_ampdu_tx *tid_tx; |
| 755 | struct ieee80211_ampdu_params params = { |
| 756 | .sta = &sta->sta, |
| 757 | .action = IEEE80211_AMPDU_TX_OPERATIONAL, |
| 758 | .tid = tid, |
| 759 | .timeout = 0, |
| 760 | .ssn = 0, |
| 761 | }; |
| 762 | |
| 763 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 764 | |
| 765 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 766 | params.buf_size = tid_tx->buf_size; |
| 767 | params.amsdu = tid_tx->amsdu; |
| 768 | |
| 769 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
| 770 | sta->sta.addr, tid); |
| 771 | |
| 772 | drv_ampdu_action(local, sta->sdata, ¶ms); |
| 773 | |
| 774 | /* |
| 775 | * synchronize with TX path, while splicing the TX path |
| 776 | * should block so it won't put more packets onto pending. |
| 777 | */ |
| 778 | spin_lock_bh(&sta->lock); |
| 779 | |
| 780 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
| 781 | /* |
| 782 | * Now mark as operational. This will be visible |
| 783 | * in the TX path, and lets it go lock-free in |
| 784 | * the common case. |
| 785 | */ |
| 786 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| 787 | ieee80211_agg_splice_finish(sta->sdata, tid); |
| 788 | |
| 789 | spin_unlock_bh(&sta->lock); |
| 790 | |
| 791 | ieee80211_agg_start_txq(sta, tid, true); |
| 792 | } |
| 793 | |
| 794 | void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, |
| 795 | struct tid_ampdu_tx *tid_tx) |
| 796 | { |
| 797 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 798 | struct ieee80211_local *local = sdata->local; |
| 799 | |
| 800 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 801 | |
| 802 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
| 803 | return; |
| 804 | |
| 805 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state) || |
| 806 | test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) |
| 807 | return; |
| 808 | |
| 809 | if (!test_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)) { |
| 810 | ieee80211_send_addba_with_timeout(sta, tid_tx); |
| 811 | /* RESPONSE_RECEIVED state whould trigger the flow again */ |
| 812 | return; |
| 813 | } |
| 814 | |
| 815 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
| 816 | ieee80211_agg_tx_operational(local, sta, tid); |
| 817 | } |
| 818 | |
| 819 | static struct tid_ampdu_tx * |
| 820 | ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata, |
| 821 | const u8 *ra, u16 tid, struct sta_info **sta) |
| 822 | { |
| 823 | struct tid_ampdu_tx *tid_tx; |
| 824 | |
| 825 | if (tid >= IEEE80211_NUM_TIDS) { |
| 826 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
| 827 | tid, IEEE80211_NUM_TIDS); |
| 828 | return NULL; |
| 829 | } |
| 830 | |
| 831 | *sta = sta_info_get_bss(sdata, ra); |
| 832 | if (!*sta) { |
| 833 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
| 834 | return NULL; |
| 835 | } |
| 836 | |
| 837 | tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]); |
| 838 | |
| 839 | if (WARN_ON(!tid_tx)) |
| 840 | ht_dbg(sdata, "addBA was not requested!\n"); |
| 841 | |
| 842 | return tid_tx; |
| 843 | } |
| 844 | |
| 845 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| 846 | const u8 *ra, u16 tid) |
| 847 | { |
| 848 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 849 | struct ieee80211_local *local = sdata->local; |
| 850 | struct sta_info *sta; |
| 851 | struct tid_ampdu_tx *tid_tx; |
| 852 | |
| 853 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
| 854 | |
| 855 | rcu_read_lock(); |
| 856 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); |
| 857 | if (!tid_tx) |
| 858 | goto out; |
| 859 | |
| 860 | set_bit(HT_AGG_STATE_START_CB, &tid_tx->state); |
| 861 | wiphy_work_queue(local->hw.wiphy, &sta->ampdu_mlme.work); |
| 862 | out: |
| 863 | rcu_read_unlock(); |
| 864 | } |
| 865 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| 866 | |
| 867 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
| 868 | { |
| 869 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 870 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 871 | struct ieee80211_local *local = sdata->local; |
| 872 | struct tid_ampdu_tx *tid_tx; |
| 873 | int ret = 0; |
| 874 | |
| 875 | trace_api_stop_tx_ba_session(pubsta, tid); |
| 876 | |
| 877 | if (!local->ops->ampdu_action) |
| 878 | return -EINVAL; |
| 879 | |
| 880 | if (tid >= IEEE80211_NUM_TIDS) |
| 881 | return -EINVAL; |
| 882 | |
| 883 | spin_lock_bh(&sta->lock); |
| 884 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 885 | |
| 886 | if (!tid_tx) { |
| 887 | ret = -ENOENT; |
| 888 | goto unlock; |
| 889 | } |
| 890 | |
| 891 | WARN(sta->reserved_tid == tid, |
| 892 | "Requested to stop BA session on reserved tid=%d", tid); |
| 893 | |
| 894 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 895 | /* already in progress stopping it */ |
| 896 | ret = 0; |
| 897 | goto unlock; |
| 898 | } |
| 899 | |
| 900 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); |
| 901 | wiphy_work_queue(local->hw.wiphy, &sta->ampdu_mlme.work); |
| 902 | |
| 903 | unlock: |
| 904 | spin_unlock_bh(&sta->lock); |
| 905 | return ret; |
| 906 | } |
| 907 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| 908 | |
| 909 | void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, |
| 910 | struct tid_ampdu_tx *tid_tx) |
| 911 | { |
| 912 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 913 | bool send_delba = false; |
| 914 | bool start_txq = false; |
| 915 | |
| 916 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", |
| 917 | sta->sta.addr, tid); |
| 918 | |
| 919 | spin_lock_bh(&sta->lock); |
| 920 | |
| 921 | if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 922 | ht_dbg(sdata, |
| 923 | "unexpected callback to A-MPDU stop for %pM tid %d\n", |
| 924 | sta->sta.addr, tid); |
| 925 | goto unlock_sta; |
| 926 | } |
| 927 | |
| 928 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
| 929 | send_delba = true; |
| 930 | |
| 931 | ieee80211_remove_tid_tx(sta, tid); |
| 932 | start_txq = true; |
| 933 | |
| 934 | unlock_sta: |
| 935 | spin_unlock_bh(&sta->lock); |
| 936 | |
| 937 | if (start_txq) |
| 938 | ieee80211_agg_start_txq(sta, tid, false); |
| 939 | |
| 940 | if (send_delba) |
| 941 | ieee80211_send_delba(sdata, sta->sta.addr, tid, |
| 942 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| 943 | } |
| 944 | |
| 945 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| 946 | const u8 *ra, u16 tid) |
| 947 | { |
| 948 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 949 | struct ieee80211_local *local = sdata->local; |
| 950 | struct sta_info *sta; |
| 951 | struct tid_ampdu_tx *tid_tx; |
| 952 | |
| 953 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
| 954 | |
| 955 | rcu_read_lock(); |
| 956 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); |
| 957 | if (!tid_tx) |
| 958 | goto out; |
| 959 | |
| 960 | set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state); |
| 961 | wiphy_work_queue(local->hw.wiphy, &sta->ampdu_mlme.work); |
| 962 | out: |
| 963 | rcu_read_unlock(); |
| 964 | } |
| 965 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| 966 | |
| 967 | |
| 968 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| 969 | struct sta_info *sta, |
| 970 | struct ieee80211_mgmt *mgmt, |
| 971 | size_t len) |
| 972 | { |
| 973 | struct tid_ampdu_tx *tid_tx; |
| 974 | struct ieee80211_txq *txq; |
| 975 | u16 capab, tid, buf_size; |
| 976 | bool amsdu; |
| 977 | |
| 978 | lockdep_assert_wiphy(sta->local->hw.wiphy); |
| 979 | |
| 980 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| 981 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
| 982 | tid = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_TID_MASK); |
| 983 | buf_size = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); |
| 984 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
| 985 | |
| 986 | txq = sta->sta.txq[tid]; |
| 987 | if (!amsdu && txq) |
| 988 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); |
| 989 | |
| 990 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| 991 | if (!tid_tx) |
| 992 | return; |
| 993 | |
| 994 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
| 995 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
| 996 | sta->sta.addr, tid); |
| 997 | return; |
| 998 | } |
| 999 | |
| 1000 | del_timer_sync(&tid_tx->addba_resp_timer); |
| 1001 | |
| 1002 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
| 1003 | sta->sta.addr, tid); |
| 1004 | |
| 1005 | /* |
| 1006 | * addba_resp_timer may have fired before we got here, and |
| 1007 | * caused WANT_STOP to be set. If the stop then was already |
| 1008 | * processed further, STOPPING might be set. |
| 1009 | */ |
| 1010 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || |
| 1011 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| 1012 | ht_dbg(sta->sdata, |
| 1013 | "got addBA resp for %pM tid %d but we already gave up\n", |
| 1014 | sta->sta.addr, tid); |
| 1015 | return; |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * IEEE 802.11-2007 7.3.1.14: |
| 1020 | * In an ADDBA Response frame, when the Status Code field |
| 1021 | * is set to 0, the Buffer Size subfield is set to a value |
| 1022 | * of at least 1. |
| 1023 | */ |
| 1024 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
| 1025 | == WLAN_STATUS_SUCCESS && buf_size) { |
| 1026 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
| 1027 | &tid_tx->state)) { |
| 1028 | /* ignore duplicate response */ |
| 1029 | return; |
| 1030 | } |
| 1031 | |
| 1032 | tid_tx->buf_size = buf_size; |
| 1033 | tid_tx->amsdu = amsdu; |
| 1034 | |
| 1035 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
| 1036 | ieee80211_agg_tx_operational(local, sta, tid); |
| 1037 | |
| 1038 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
| 1039 | |
| 1040 | tid_tx->timeout = |
| 1041 | le16_to_cpu(mgmt->u.action.u.addba_resp.timeout); |
| 1042 | |
| 1043 | if (tid_tx->timeout) { |
| 1044 | mod_timer(&tid_tx->session_timer, |
| 1045 | TU_TO_EXP_TIME(tid_tx->timeout)); |
| 1046 | tid_tx->last_tx = jiffies; |
| 1047 | } |
| 1048 | |
| 1049 | } else { |
| 1050 | __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
| 1051 | } |
| 1052 | } |