1 /* 2 * HT handling 3 * 4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2007-2009, Intel Corporation 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/ieee80211.h> 17 #include <net/mac80211.h> 18 #include "ieee80211_i.h" 19 #include "wme.h" 20 21 /** 22 * DOC: TX aggregation 23 * 24 * Aggregation on the TX side requires setting the hardware flag 25 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues 26 * hardware parameter to the number of hardware AMPDU queues. If there are no 27 * hardware queues then the driver will (currently) have to do all frame 28 * buffering. 29 * 30 * When TX aggregation is started by some subsystem (usually the rate control 31 * algorithm would be appropriate) by calling the 32 * ieee80211_start_tx_ba_session() function, the driver will be notified via 33 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. 34 * 35 * In response to that, the driver is later required to call the 36 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) 37 * function, which will start the aggregation session. 38 * 39 * Similarly, when the aggregation session is stopped by 40 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will 41 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the 42 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() 43 * (or ieee80211_stop_tx_ba_cb_irqsafe()). 44 */ 45 46 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, 47 const u8 *da, u16 tid, 48 u8 dialog_token, u16 start_seq_num, 49 u16 agg_size, u16 timeout) 50 { 51 struct ieee80211_local *local = sdata->local; 52 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 53 struct sk_buff *skb; 54 struct ieee80211_mgmt *mgmt; 55 u16 capab; 56 57 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 58 59 if (!skb) { 60 printk(KERN_ERR "%s: failed to allocate buffer " 61 "for addba request frame\n", sdata->dev->name); 62 return; 63 } 64 skb_reserve(skb, local->hw.extra_tx_headroom); 65 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 66 memset(mgmt, 0, 24); 67 memcpy(mgmt->da, da, ETH_ALEN); 68 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 69 if (sdata->vif.type == NL80211_IFTYPE_AP || 70 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 71 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); 72 else 73 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 74 75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 76 IEEE80211_STYPE_ACTION); 77 78 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); 79 80 mgmt->u.action.category = WLAN_CATEGORY_BACK; 81 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; 82 83 mgmt->u.action.u.addba_req.dialog_token = dialog_token; 84 capab = (u16)(1 << 1); /* bit 1 aggregation policy */ 85 capab |= (u16)(tid << 2); /* bit 5:2 TID number */ 86 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ 87 88 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); 89 90 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); 91 mgmt->u.action.u.addba_req.start_seq_num = 92 cpu_to_le16(start_seq_num << 4); 93 94 ieee80211_tx_skb(sdata, skb, 1); 95 } 96 97 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) 98 { 99 struct ieee80211_local *local = sdata->local; 100 struct sk_buff *skb; 101 struct ieee80211_bar *bar; 102 u16 bar_control = 0; 103 104 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); 105 if (!skb) { 106 printk(KERN_ERR "%s: failed to allocate buffer for " 107 "bar frame\n", sdata->dev->name); 108 return; 109 } 110 skb_reserve(skb, local->hw.extra_tx_headroom); 111 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); 112 memset(bar, 0, sizeof(*bar)); 113 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 114 IEEE80211_STYPE_BACK_REQ); 115 memcpy(bar->ra, ra, ETH_ALEN); 116 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); 117 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; 118 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; 119 bar_control |= (u16)(tid << 12); 120 bar->control = cpu_to_le16(bar_control); 121 bar->start_seq_num = cpu_to_le16(ssn); 122 123 ieee80211_tx_skb(sdata, skb, 0); 124 } 125 126 static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, 127 enum ieee80211_back_parties initiator) 128 { 129 struct ieee80211_local *local = sta->local; 130 int ret; 131 u8 *state; 132 133 state = &sta->ampdu_mlme.tid_state_tx[tid]; 134 135 if (local->hw.ampdu_queues) 136 ieee80211_stop_queue(&local->hw, sta->tid_to_tx_q[tid]); 137 138 *state = HT_AGG_STATE_REQ_STOP_BA_MSK | 139 (initiator << HT_AGG_STATE_INITIATOR_SHIFT); 140 141 ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP, 142 &sta->sta, tid, NULL); 143 144 /* HW shall not deny going back to legacy */ 145 if (WARN_ON(ret)) { 146 *state = HT_AGG_STATE_OPERATIONAL; 147 if (local->hw.ampdu_queues) 148 ieee80211_wake_queue(&local->hw, sta->tid_to_tx_q[tid]); 149 } 150 151 return ret; 152 } 153 154 /* 155 * After sending add Block Ack request we activated a timer until 156 * add Block Ack response will arrive from the recipient. 157 * If this timer expires sta_addba_resp_timer_expired will be executed. 158 */ 159 static void sta_addba_resp_timer_expired(unsigned long data) 160 { 161 /* not an elegant detour, but there is no choice as the timer passes 162 * only one argument, and both sta_info and TID are needed, so init 163 * flow in sta_info_create gives the TID as data, while the timer_to_id 164 * array gives the sta through container_of */ 165 u16 tid = *(u8 *)data; 166 struct sta_info *sta = container_of((void *)data, 167 struct sta_info, timer_to_tid[tid]); 168 u8 *state; 169 170 state = &sta->ampdu_mlme.tid_state_tx[tid]; 171 172 /* check if the TID waits for addBA response */ 173 spin_lock_bh(&sta->lock); 174 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 175 spin_unlock_bh(&sta->lock); 176 *state = HT_AGG_STATE_IDLE; 177 #ifdef CONFIG_MAC80211_HT_DEBUG 178 printk(KERN_DEBUG "timer expired on tid %d but we are not " 179 "expecting addBA response there", tid); 180 #endif 181 return; 182 } 183 184 #ifdef CONFIG_MAC80211_HT_DEBUG 185 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); 186 #endif 187 188 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); 189 spin_unlock_bh(&sta->lock); 190 } 191 192 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) 193 { 194 struct ieee80211_local *local = hw_to_local(hw); 195 struct sta_info *sta; 196 struct ieee80211_sub_if_data *sdata; 197 u16 start_seq_num; 198 u8 *state; 199 int ret = 0; 200 201 if (WARN_ON(!local->ops->ampdu_action)) 202 return -EINVAL; 203 204 if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) 205 return -EINVAL; 206 207 #ifdef CONFIG_MAC80211_HT_DEBUG 208 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", 209 ra, tid); 210 #endif /* CONFIG_MAC80211_HT_DEBUG */ 211 212 rcu_read_lock(); 213 214 sta = sta_info_get(local, ra); 215 if (!sta) { 216 #ifdef CONFIG_MAC80211_HT_DEBUG 217 printk(KERN_DEBUG "Could not find the station\n"); 218 #endif 219 ret = -ENOENT; 220 goto exit; 221 } 222 223 /* 224 * The aggregation code is not prepared to handle 225 * anything but STA/AP due to the BSSID handling. 226 * IBSS could work in the code but isn't supported 227 * by drivers or the standard. 228 */ 229 if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && 230 sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 231 sta->sdata->vif.type != NL80211_IFTYPE_AP) { 232 ret = -EINVAL; 233 goto exit; 234 } 235 236 spin_lock_bh(&sta->lock); 237 238 /* we have tried too many times, receiver does not want A-MPDU */ 239 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { 240 ret = -EBUSY; 241 goto err_unlock_sta; 242 } 243 244 state = &sta->ampdu_mlme.tid_state_tx[tid]; 245 /* check if the TID is not in aggregation flow already */ 246 if (*state != HT_AGG_STATE_IDLE) { 247 #ifdef CONFIG_MAC80211_HT_DEBUG 248 printk(KERN_DEBUG "BA request denied - session is not " 249 "idle on tid %u\n", tid); 250 #endif /* CONFIG_MAC80211_HT_DEBUG */ 251 ret = -EAGAIN; 252 goto err_unlock_sta; 253 } 254 255 /* prepare A-MPDU MLME for Tx aggregation */ 256 sta->ampdu_mlme.tid_tx[tid] = 257 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); 258 if (!sta->ampdu_mlme.tid_tx[tid]) { 259 #ifdef CONFIG_MAC80211_HT_DEBUG 260 if (net_ratelimit()) 261 printk(KERN_ERR "allocate tx mlme to tid %d failed\n", 262 tid); 263 #endif 264 ret = -ENOMEM; 265 goto err_unlock_sta; 266 } 267 /* Tx timer */ 268 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = 269 sta_addba_resp_timer_expired; 270 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = 271 (unsigned long)&sta->timer_to_tid[tid]; 272 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 273 274 if (hw->ampdu_queues) { 275 /* create a new queue for this aggregation */ 276 ret = ieee80211_ht_agg_queue_add(local, sta, tid); 277 278 /* case no queue is available to aggregation 279 * don't switch to aggregation */ 280 if (ret) { 281 #ifdef CONFIG_MAC80211_HT_DEBUG 282 printk(KERN_DEBUG "BA request denied - " 283 "queue unavailable for tid %d\n", tid); 284 #endif /* CONFIG_MAC80211_HT_DEBUG */ 285 goto err_unlock_queue; 286 } 287 } 288 sdata = sta->sdata; 289 290 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the 291 * call back right away, it must see that the flow has begun */ 292 *state |= HT_ADDBA_REQUESTED_MSK; 293 294 /* This is slightly racy because the queue isn't stopped */ 295 start_seq_num = sta->tid_seq[tid]; 296 297 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, 298 &sta->sta, tid, &start_seq_num); 299 300 if (ret) { 301 /* No need to requeue the packets in the agg queue, since we 302 * held the tx lock: no packet could be enqueued to the newly 303 * allocated queue */ 304 if (hw->ampdu_queues) 305 ieee80211_ht_agg_queue_remove(local, sta, tid, 0); 306 #ifdef CONFIG_MAC80211_HT_DEBUG 307 printk(KERN_DEBUG "BA request denied - HW unavailable for" 308 " tid %d\n", tid); 309 #endif /* CONFIG_MAC80211_HT_DEBUG */ 310 *state = HT_AGG_STATE_IDLE; 311 goto err_unlock_queue; 312 } 313 314 /* Will put all the packets in the new SW queue */ 315 if (hw->ampdu_queues) 316 ieee80211_requeue(local, ieee802_1d_to_ac[tid]); 317 spin_unlock_bh(&sta->lock); 318 319 /* send an addBA request */ 320 sta->ampdu_mlme.dialog_token_allocator++; 321 sta->ampdu_mlme.tid_tx[tid]->dialog_token = 322 sta->ampdu_mlme.dialog_token_allocator; 323 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; 324 325 326 ieee80211_send_addba_request(sta->sdata, ra, tid, 327 sta->ampdu_mlme.tid_tx[tid]->dialog_token, 328 sta->ampdu_mlme.tid_tx[tid]->ssn, 329 0x40, 5000); 330 /* activate the timer for the recipient's addBA response */ 331 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = 332 jiffies + ADDBA_RESP_INTERVAL; 333 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 334 #ifdef CONFIG_MAC80211_HT_DEBUG 335 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); 336 #endif 337 goto exit; 338 339 err_unlock_queue: 340 kfree(sta->ampdu_mlme.tid_tx[tid]); 341 sta->ampdu_mlme.tid_tx[tid] = NULL; 342 ret = -EBUSY; 343 err_unlock_sta: 344 spin_unlock_bh(&sta->lock); 345 exit: 346 rcu_read_unlock(); 347 return ret; 348 } 349 EXPORT_SYMBOL(ieee80211_start_tx_ba_session); 350 351 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) 352 { 353 struct ieee80211_local *local = hw_to_local(hw); 354 struct sta_info *sta; 355 u8 *state; 356 357 if (tid >= STA_TID_NUM) { 358 #ifdef CONFIG_MAC80211_HT_DEBUG 359 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 360 tid, STA_TID_NUM); 361 #endif 362 return; 363 } 364 365 rcu_read_lock(); 366 sta = sta_info_get(local, ra); 367 if (!sta) { 368 rcu_read_unlock(); 369 #ifdef CONFIG_MAC80211_HT_DEBUG 370 printk(KERN_DEBUG "Could not find station: %pM\n", ra); 371 #endif 372 return; 373 } 374 375 state = &sta->ampdu_mlme.tid_state_tx[tid]; 376 spin_lock_bh(&sta->lock); 377 378 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 379 #ifdef CONFIG_MAC80211_HT_DEBUG 380 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", 381 *state); 382 #endif 383 spin_unlock_bh(&sta->lock); 384 rcu_read_unlock(); 385 return; 386 } 387 388 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); 389 390 *state |= HT_ADDBA_DRV_READY_MSK; 391 392 if (*state == HT_AGG_STATE_OPERATIONAL) { 393 #ifdef CONFIG_MAC80211_HT_DEBUG 394 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); 395 #endif 396 if (hw->ampdu_queues) 397 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 398 } 399 spin_unlock_bh(&sta->lock); 400 rcu_read_unlock(); 401 } 402 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); 403 404 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 405 const u8 *ra, u16 tid) 406 { 407 struct ieee80211_local *local = hw_to_local(hw); 408 struct ieee80211_ra_tid *ra_tid; 409 struct sk_buff *skb = dev_alloc_skb(0); 410 411 if (unlikely(!skb)) { 412 #ifdef CONFIG_MAC80211_HT_DEBUG 413 if (net_ratelimit()) 414 printk(KERN_WARNING "%s: Not enough memory, " 415 "dropping start BA session", skb->dev->name); 416 #endif 417 return; 418 } 419 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 420 memcpy(&ra_tid->ra, ra, ETH_ALEN); 421 ra_tid->tid = tid; 422 423 skb->pkt_type = IEEE80211_ADDBA_MSG; 424 skb_queue_tail(&local->skb_queue, skb); 425 tasklet_schedule(&local->tasklet); 426 } 427 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); 428 429 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, 430 enum ieee80211_back_parties initiator) 431 { 432 u8 *state; 433 int ret; 434 435 /* check if the TID is in aggregation */ 436 state = &sta->ampdu_mlme.tid_state_tx[tid]; 437 spin_lock_bh(&sta->lock); 438 439 if (*state != HT_AGG_STATE_OPERATIONAL) { 440 ret = -ENOENT; 441 goto unlock; 442 } 443 444 #ifdef CONFIG_MAC80211_HT_DEBUG 445 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", 446 sta->sta.addr, tid); 447 #endif /* CONFIG_MAC80211_HT_DEBUG */ 448 449 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); 450 451 unlock: 452 spin_unlock_bh(&sta->lock); 453 return ret; 454 } 455 456 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, 457 u8 *ra, u16 tid, 458 enum ieee80211_back_parties initiator) 459 { 460 struct ieee80211_local *local = hw_to_local(hw); 461 struct sta_info *sta; 462 int ret = 0; 463 464 if (WARN_ON(!local->ops->ampdu_action)) 465 return -EINVAL; 466 467 if (tid >= STA_TID_NUM) 468 return -EINVAL; 469 470 rcu_read_lock(); 471 sta = sta_info_get(local, ra); 472 if (!sta) { 473 rcu_read_unlock(); 474 return -ENOENT; 475 } 476 477 ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); 478 rcu_read_unlock(); 479 return ret; 480 } 481 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); 482 483 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) 484 { 485 struct ieee80211_local *local = hw_to_local(hw); 486 struct sta_info *sta; 487 u8 *state; 488 int agg_queue; 489 490 if (tid >= STA_TID_NUM) { 491 #ifdef CONFIG_MAC80211_HT_DEBUG 492 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 493 tid, STA_TID_NUM); 494 #endif 495 return; 496 } 497 498 #ifdef CONFIG_MAC80211_HT_DEBUG 499 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", 500 ra, tid); 501 #endif /* CONFIG_MAC80211_HT_DEBUG */ 502 503 rcu_read_lock(); 504 sta = sta_info_get(local, ra); 505 if (!sta) { 506 #ifdef CONFIG_MAC80211_HT_DEBUG 507 printk(KERN_DEBUG "Could not find station: %pM\n", ra); 508 #endif 509 rcu_read_unlock(); 510 return; 511 } 512 state = &sta->ampdu_mlme.tid_state_tx[tid]; 513 514 /* NOTE: no need to use sta->lock in this state check, as 515 * ieee80211_stop_tx_ba_session will let only one stop call to 516 * pass through per sta/tid 517 */ 518 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { 519 #ifdef CONFIG_MAC80211_HT_DEBUG 520 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); 521 #endif 522 rcu_read_unlock(); 523 return; 524 } 525 526 if (*state & HT_AGG_STATE_INITIATOR_MSK) 527 ieee80211_send_delba(sta->sdata, ra, tid, 528 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); 529 530 if (hw->ampdu_queues) { 531 agg_queue = sta->tid_to_tx_q[tid]; 532 ieee80211_ht_agg_queue_remove(local, sta, tid, 1); 533 534 /* We just requeued the all the frames that were in the 535 * removed queue, and since we might miss a softirq we do 536 * netif_schedule_queue. ieee80211_wake_queue is not used 537 * here as this queue is not necessarily stopped 538 */ 539 netif_schedule_queue(netdev_get_tx_queue(local->mdev, 540 agg_queue)); 541 } 542 spin_lock_bh(&sta->lock); 543 *state = HT_AGG_STATE_IDLE; 544 sta->ampdu_mlme.addba_req_num[tid] = 0; 545 kfree(sta->ampdu_mlme.tid_tx[tid]); 546 sta->ampdu_mlme.tid_tx[tid] = NULL; 547 spin_unlock_bh(&sta->lock); 548 549 rcu_read_unlock(); 550 } 551 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); 552 553 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 554 const u8 *ra, u16 tid) 555 { 556 struct ieee80211_local *local = hw_to_local(hw); 557 struct ieee80211_ra_tid *ra_tid; 558 struct sk_buff *skb = dev_alloc_skb(0); 559 560 if (unlikely(!skb)) { 561 #ifdef CONFIG_MAC80211_HT_DEBUG 562 if (net_ratelimit()) 563 printk(KERN_WARNING "%s: Not enough memory, " 564 "dropping stop BA session", skb->dev->name); 565 #endif 566 return; 567 } 568 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 569 memcpy(&ra_tid->ra, ra, ETH_ALEN); 570 ra_tid->tid = tid; 571 572 skb->pkt_type = IEEE80211_DELBA_MSG; 573 skb_queue_tail(&local->skb_queue, skb); 574 tasklet_schedule(&local->tasklet); 575 } 576 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); 577 578 579 void ieee80211_process_addba_resp(struct ieee80211_local *local, 580 struct sta_info *sta, 581 struct ieee80211_mgmt *mgmt, 582 size_t len) 583 { 584 struct ieee80211_hw *hw = &local->hw; 585 u16 capab; 586 u16 tid, start_seq_num; 587 u8 *state; 588 589 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); 590 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 591 592 state = &sta->ampdu_mlme.tid_state_tx[tid]; 593 594 spin_lock_bh(&sta->lock); 595 596 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 597 spin_unlock_bh(&sta->lock); 598 return; 599 } 600 601 if (mgmt->u.action.u.addba_resp.dialog_token != 602 sta->ampdu_mlme.tid_tx[tid]->dialog_token) { 603 spin_unlock_bh(&sta->lock); 604 #ifdef CONFIG_MAC80211_HT_DEBUG 605 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); 606 #endif /* CONFIG_MAC80211_HT_DEBUG */ 607 return; 608 } 609 610 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 611 #ifdef CONFIG_MAC80211_HT_DEBUG 612 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); 613 #endif /* CONFIG_MAC80211_HT_DEBUG */ 614 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) 615 == WLAN_STATUS_SUCCESS) { 616 *state |= HT_ADDBA_RECEIVED_MSK; 617 sta->ampdu_mlme.addba_req_num[tid] = 0; 618 619 if (*state == HT_AGG_STATE_OPERATIONAL && 620 local->hw.ampdu_queues) 621 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 622 623 if (local->ops->ampdu_action) { 624 (void)local->ops->ampdu_action(hw, 625 IEEE80211_AMPDU_TX_RESUME, 626 &sta->sta, tid, &start_seq_num); 627 } 628 #ifdef CONFIG_MAC80211_HT_DEBUG 629 printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid); 630 #endif /* CONFIG_MAC80211_HT_DEBUG */ 631 } else { 632 sta->ampdu_mlme.addba_req_num[tid]++; 633 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); 634 } 635 spin_unlock_bh(&sta->lock); 636 } 637