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 "driver-ops.h" 20 #include "wme.h" 21 22 /** 23 * DOC: TX aggregation 24 * 25 * Aggregation on the TX side requires setting the hardware flag 26 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues 27 * hardware parameter to the number of hardware AMPDU queues. If there are no 28 * hardware queues then the driver will (currently) have to do all frame 29 * buffering. 30 * 31 * When TX aggregation is started by some subsystem (usually the rate control 32 * algorithm would be appropriate) by calling the 33 * ieee80211_start_tx_ba_session() function, the driver will be notified via 34 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. 35 * 36 * In response to that, the driver is later required to call the 37 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) 38 * function, which will start the aggregation session. 39 * 40 * Similarly, when the aggregation session is stopped by 41 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will 42 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the 43 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() 44 * (or ieee80211_stop_tx_ba_cb_irqsafe()). 45 */ 46 47 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, 48 const u8 *da, u16 tid, 49 u8 dialog_token, u16 start_seq_num, 50 u16 agg_size, u16 timeout) 51 { 52 struct ieee80211_local *local = sdata->local; 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 if (sdata->vif.type == NL80211_IFTYPE_STATION) 73 memcpy(mgmt->bssid, sdata->u.mgd.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 (*state == HT_AGG_STATE_OPERATIONAL) 136 sta->ampdu_mlme.addba_req_num[tid] = 0; 137 138 *state = HT_AGG_STATE_REQ_STOP_BA_MSK | 139 (initiator << HT_AGG_STATE_INITIATOR_SHIFT); 140 141 ret = drv_ampdu_action(local, 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 /* 148 * We may have pending packets get stuck in this case... 149 * Not bothering with a workaround for now. 150 */ 151 } 152 153 return ret; 154 } 155 156 /* 157 * After sending add Block Ack request we activated a timer until 158 * add Block Ack response will arrive from the recipient. 159 * If this timer expires sta_addba_resp_timer_expired will be executed. 160 */ 161 static void sta_addba_resp_timer_expired(unsigned long data) 162 { 163 /* not an elegant detour, but there is no choice as the timer passes 164 * only one argument, and both sta_info and TID are needed, so init 165 * flow in sta_info_create gives the TID as data, while the timer_to_id 166 * array gives the sta through container_of */ 167 u16 tid = *(u8 *)data; 168 struct sta_info *sta = container_of((void *)data, 169 struct sta_info, timer_to_tid[tid]); 170 u8 *state; 171 172 state = &sta->ampdu_mlme.tid_state_tx[tid]; 173 174 /* check if the TID waits for addBA response */ 175 spin_lock_bh(&sta->lock); 176 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 177 spin_unlock_bh(&sta->lock); 178 *state = HT_AGG_STATE_IDLE; 179 #ifdef CONFIG_MAC80211_HT_DEBUG 180 printk(KERN_DEBUG "timer expired on tid %d but we are not " 181 "expecting addBA response there", tid); 182 #endif 183 return; 184 } 185 186 #ifdef CONFIG_MAC80211_HT_DEBUG 187 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); 188 #endif 189 190 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); 191 spin_unlock_bh(&sta->lock); 192 } 193 194 static inline int ieee80211_ac_from_tid(int tid) 195 { 196 return ieee802_1d_to_ac[tid & 7]; 197 } 198 199 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) 200 { 201 struct ieee80211_local *local = hw_to_local(hw); 202 struct sta_info *sta; 203 struct ieee80211_sub_if_data *sdata; 204 u8 *state; 205 int ret = 0; 206 u16 start_seq_num; 207 208 if (WARN_ON(!local->ops->ampdu_action)) 209 return -EINVAL; 210 211 if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) 212 return -EINVAL; 213 214 #ifdef CONFIG_MAC80211_HT_DEBUG 215 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", 216 ra, tid); 217 #endif /* CONFIG_MAC80211_HT_DEBUG */ 218 219 rcu_read_lock(); 220 221 sta = sta_info_get(local, ra); 222 if (!sta) { 223 #ifdef CONFIG_MAC80211_HT_DEBUG 224 printk(KERN_DEBUG "Could not find the station\n"); 225 #endif 226 ret = -ENOENT; 227 goto unlock; 228 } 229 230 /* 231 * The aggregation code is not prepared to handle 232 * anything but STA/AP due to the BSSID handling. 233 * IBSS could work in the code but isn't supported 234 * by drivers or the standard. 235 */ 236 if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && 237 sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 238 sta->sdata->vif.type != NL80211_IFTYPE_AP) { 239 ret = -EINVAL; 240 goto unlock; 241 } 242 243 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { 244 #ifdef CONFIG_MAC80211_HT_DEBUG 245 printk(KERN_DEBUG "Suspend in progress. " 246 "Denying BA session request\n"); 247 #endif 248 ret = -EINVAL; 249 goto unlock; 250 } 251 252 spin_lock_bh(&sta->lock); 253 spin_lock(&local->ampdu_lock); 254 255 sdata = sta->sdata; 256 257 /* we have tried too many times, receiver does not want A-MPDU */ 258 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { 259 ret = -EBUSY; 260 goto err_unlock_sta; 261 } 262 263 state = &sta->ampdu_mlme.tid_state_tx[tid]; 264 /* check if the TID is not in aggregation flow already */ 265 if (*state != HT_AGG_STATE_IDLE) { 266 #ifdef CONFIG_MAC80211_HT_DEBUG 267 printk(KERN_DEBUG "BA request denied - session is not " 268 "idle on tid %u\n", tid); 269 #endif /* CONFIG_MAC80211_HT_DEBUG */ 270 ret = -EAGAIN; 271 goto err_unlock_sta; 272 } 273 274 /* 275 * While we're asking the driver about the aggregation, 276 * stop the AC queue so that we don't have to worry 277 * about frames that came in while we were doing that, 278 * which would require us to put them to the AC pending 279 * afterwards which just makes the code more complex. 280 */ 281 ieee80211_stop_queue_by_reason( 282 &local->hw, ieee80211_ac_from_tid(tid), 283 IEEE80211_QUEUE_STOP_REASON_AGGREGATION); 284 285 /* prepare A-MPDU MLME for Tx aggregation */ 286 sta->ampdu_mlme.tid_tx[tid] = 287 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); 288 if (!sta->ampdu_mlme.tid_tx[tid]) { 289 #ifdef CONFIG_MAC80211_HT_DEBUG 290 if (net_ratelimit()) 291 printk(KERN_ERR "allocate tx mlme to tid %d failed\n", 292 tid); 293 #endif 294 ret = -ENOMEM; 295 goto err_wake_queue; 296 } 297 298 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); 299 300 /* Tx timer */ 301 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = 302 sta_addba_resp_timer_expired; 303 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = 304 (unsigned long)&sta->timer_to_tid[tid]; 305 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 306 307 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the 308 * call back right away, it must see that the flow has begun */ 309 *state |= HT_ADDBA_REQUESTED_MSK; 310 311 start_seq_num = sta->tid_seq[tid]; 312 313 ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_START, 314 &sta->sta, tid, &start_seq_num); 315 316 if (ret) { 317 #ifdef CONFIG_MAC80211_HT_DEBUG 318 printk(KERN_DEBUG "BA request denied - HW unavailable for" 319 " tid %d\n", tid); 320 #endif /* CONFIG_MAC80211_HT_DEBUG */ 321 *state = HT_AGG_STATE_IDLE; 322 goto err_free; 323 } 324 325 /* Driver vetoed or OKed, but we can take packets again now */ 326 ieee80211_wake_queue_by_reason( 327 &local->hw, ieee80211_ac_from_tid(tid), 328 IEEE80211_QUEUE_STOP_REASON_AGGREGATION); 329 330 spin_unlock(&local->ampdu_lock); 331 spin_unlock_bh(&sta->lock); 332 333 /* send an addBA request */ 334 sta->ampdu_mlme.dialog_token_allocator++; 335 sta->ampdu_mlme.tid_tx[tid]->dialog_token = 336 sta->ampdu_mlme.dialog_token_allocator; 337 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; 338 339 ieee80211_send_addba_request(sta->sdata, ra, tid, 340 sta->ampdu_mlme.tid_tx[tid]->dialog_token, 341 sta->ampdu_mlme.tid_tx[tid]->ssn, 342 0x40, 5000); 343 sta->ampdu_mlme.addba_req_num[tid]++; 344 /* activate the timer for the recipient's addBA response */ 345 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = 346 jiffies + ADDBA_RESP_INTERVAL; 347 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 348 #ifdef CONFIG_MAC80211_HT_DEBUG 349 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); 350 #endif 351 goto unlock; 352 353 err_free: 354 kfree(sta->ampdu_mlme.tid_tx[tid]); 355 sta->ampdu_mlme.tid_tx[tid] = NULL; 356 err_wake_queue: 357 ieee80211_wake_queue_by_reason( 358 &local->hw, ieee80211_ac_from_tid(tid), 359 IEEE80211_QUEUE_STOP_REASON_AGGREGATION); 360 err_unlock_sta: 361 spin_unlock(&local->ampdu_lock); 362 spin_unlock_bh(&sta->lock); 363 unlock: 364 rcu_read_unlock(); 365 return ret; 366 } 367 EXPORT_SYMBOL(ieee80211_start_tx_ba_session); 368 369 /* 370 * splice packets from the STA's pending to the local pending, 371 * requires a call to ieee80211_agg_splice_finish and holding 372 * local->ampdu_lock across both calls. 373 */ 374 static void ieee80211_agg_splice_packets(struct ieee80211_local *local, 375 struct sta_info *sta, u16 tid) 376 { 377 unsigned long flags; 378 u16 queue = ieee80211_ac_from_tid(tid); 379 380 ieee80211_stop_queue_by_reason( 381 &local->hw, queue, 382 IEEE80211_QUEUE_STOP_REASON_AGGREGATION); 383 384 if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)) 385 return; 386 387 if (WARN(!sta->ampdu_mlme.tid_tx[tid], 388 "TID %d gone but expected when splicing aggregates from" 389 "the pending queue\n", tid)) 390 return; 391 392 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { 393 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 394 /* mark queue as pending, it is stopped already */ 395 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING, 396 &local->queue_stop_reasons[queue]); 397 /* copy over remaining packets */ 398 skb_queue_splice_tail_init( 399 &sta->ampdu_mlme.tid_tx[tid]->pending, 400 &local->pending[queue]); 401 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 402 } 403 } 404 405 static void ieee80211_agg_splice_finish(struct ieee80211_local *local, 406 struct sta_info *sta, u16 tid) 407 { 408 u16 queue = ieee80211_ac_from_tid(tid); 409 410 ieee80211_wake_queue_by_reason( 411 &local->hw, queue, 412 IEEE80211_QUEUE_STOP_REASON_AGGREGATION); 413 } 414 415 /* caller must hold sta->lock */ 416 static void ieee80211_agg_tx_operational(struct ieee80211_local *local, 417 struct sta_info *sta, u16 tid) 418 { 419 #ifdef CONFIG_MAC80211_HT_DEBUG 420 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); 421 #endif 422 423 spin_lock(&local->ampdu_lock); 424 ieee80211_agg_splice_packets(local, sta, tid); 425 /* 426 * NB: we rely on sta->lock being taken in the TX 427 * processing here when adding to the pending queue, 428 * otherwise we could only change the state of the 429 * session to OPERATIONAL _here_. 430 */ 431 ieee80211_agg_splice_finish(local, sta, tid); 432 spin_unlock(&local->ampdu_lock); 433 434 drv_ampdu_action(local, IEEE80211_AMPDU_TX_OPERATIONAL, 435 &sta->sta, tid, NULL); 436 } 437 438 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) 439 { 440 struct ieee80211_local *local = hw_to_local(hw); 441 struct sta_info *sta; 442 u8 *state; 443 444 if (tid >= STA_TID_NUM) { 445 #ifdef CONFIG_MAC80211_HT_DEBUG 446 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 447 tid, STA_TID_NUM); 448 #endif 449 return; 450 } 451 452 rcu_read_lock(); 453 sta = sta_info_get(local, ra); 454 if (!sta) { 455 rcu_read_unlock(); 456 #ifdef CONFIG_MAC80211_HT_DEBUG 457 printk(KERN_DEBUG "Could not find station: %pM\n", ra); 458 #endif 459 return; 460 } 461 462 state = &sta->ampdu_mlme.tid_state_tx[tid]; 463 spin_lock_bh(&sta->lock); 464 465 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { 466 #ifdef CONFIG_MAC80211_HT_DEBUG 467 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", 468 *state); 469 #endif 470 spin_unlock_bh(&sta->lock); 471 rcu_read_unlock(); 472 return; 473 } 474 475 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) 476 goto out; 477 478 *state |= HT_ADDBA_DRV_READY_MSK; 479 480 if (*state == HT_AGG_STATE_OPERATIONAL) 481 ieee80211_agg_tx_operational(local, sta, tid); 482 483 out: 484 spin_unlock_bh(&sta->lock); 485 rcu_read_unlock(); 486 } 487 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); 488 489 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 490 const u8 *ra, u16 tid) 491 { 492 struct ieee80211_local *local = hw_to_local(hw); 493 struct ieee80211_ra_tid *ra_tid; 494 struct sk_buff *skb = dev_alloc_skb(0); 495 496 if (unlikely(!skb)) { 497 #ifdef CONFIG_MAC80211_HT_DEBUG 498 if (net_ratelimit()) 499 printk(KERN_WARNING "%s: Not enough memory, " 500 "dropping start BA session", skb->dev->name); 501 #endif 502 return; 503 } 504 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 505 memcpy(&ra_tid->ra, ra, ETH_ALEN); 506 ra_tid->tid = tid; 507 508 skb->pkt_type = IEEE80211_ADDBA_MSG; 509 skb_queue_tail(&local->skb_queue, skb); 510 tasklet_schedule(&local->tasklet); 511 } 512 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); 513 514 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, 515 enum ieee80211_back_parties initiator) 516 { 517 u8 *state; 518 int ret; 519 520 /* check if the TID is in aggregation */ 521 state = &sta->ampdu_mlme.tid_state_tx[tid]; 522 spin_lock_bh(&sta->lock); 523 524 if (*state != HT_AGG_STATE_OPERATIONAL) { 525 ret = -ENOENT; 526 goto unlock; 527 } 528 529 #ifdef CONFIG_MAC80211_HT_DEBUG 530 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", 531 sta->sta.addr, tid); 532 #endif /* CONFIG_MAC80211_HT_DEBUG */ 533 534 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); 535 536 unlock: 537 spin_unlock_bh(&sta->lock); 538 return ret; 539 } 540 541 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, 542 u8 *ra, u16 tid, 543 enum ieee80211_back_parties initiator) 544 { 545 struct ieee80211_local *local = hw_to_local(hw); 546 struct sta_info *sta; 547 int ret = 0; 548 549 if (WARN_ON(!local->ops->ampdu_action)) 550 return -EINVAL; 551 552 if (tid >= STA_TID_NUM) 553 return -EINVAL; 554 555 rcu_read_lock(); 556 sta = sta_info_get(local, ra); 557 if (!sta) { 558 rcu_read_unlock(); 559 return -ENOENT; 560 } 561 562 ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); 563 rcu_read_unlock(); 564 return ret; 565 } 566 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); 567 568 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) 569 { 570 struct ieee80211_local *local = hw_to_local(hw); 571 struct sta_info *sta; 572 u8 *state; 573 574 if (tid >= STA_TID_NUM) { 575 #ifdef CONFIG_MAC80211_HT_DEBUG 576 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 577 tid, STA_TID_NUM); 578 #endif 579 return; 580 } 581 582 #ifdef CONFIG_MAC80211_HT_DEBUG 583 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", 584 ra, tid); 585 #endif /* CONFIG_MAC80211_HT_DEBUG */ 586 587 rcu_read_lock(); 588 sta = sta_info_get(local, ra); 589 if (!sta) { 590 #ifdef CONFIG_MAC80211_HT_DEBUG 591 printk(KERN_DEBUG "Could not find station: %pM\n", ra); 592 #endif 593 rcu_read_unlock(); 594 return; 595 } 596 state = &sta->ampdu_mlme.tid_state_tx[tid]; 597 598 /* NOTE: no need to use sta->lock in this state check, as 599 * ieee80211_stop_tx_ba_session will let only one stop call to 600 * pass through per sta/tid 601 */ 602 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { 603 #ifdef CONFIG_MAC80211_HT_DEBUG 604 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); 605 #endif 606 rcu_read_unlock(); 607 return; 608 } 609 610 if (*state & HT_AGG_STATE_INITIATOR_MSK) 611 ieee80211_send_delba(sta->sdata, ra, tid, 612 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); 613 614 spin_lock_bh(&sta->lock); 615 spin_lock(&local->ampdu_lock); 616 617 ieee80211_agg_splice_packets(local, sta, tid); 618 619 *state = HT_AGG_STATE_IDLE; 620 /* from now on packets are no longer put onto sta->pending */ 621 kfree(sta->ampdu_mlme.tid_tx[tid]); 622 sta->ampdu_mlme.tid_tx[tid] = NULL; 623 624 ieee80211_agg_splice_finish(local, sta, tid); 625 626 spin_unlock(&local->ampdu_lock); 627 spin_unlock_bh(&sta->lock); 628 629 rcu_read_unlock(); 630 } 631 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); 632 633 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 634 const u8 *ra, u16 tid) 635 { 636 struct ieee80211_local *local = hw_to_local(hw); 637 struct ieee80211_ra_tid *ra_tid; 638 struct sk_buff *skb = dev_alloc_skb(0); 639 640 if (unlikely(!skb)) { 641 #ifdef CONFIG_MAC80211_HT_DEBUG 642 if (net_ratelimit()) 643 printk(KERN_WARNING "%s: Not enough memory, " 644 "dropping stop BA session", skb->dev->name); 645 #endif 646 return; 647 } 648 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 649 memcpy(&ra_tid->ra, ra, ETH_ALEN); 650 ra_tid->tid = tid; 651 652 skb->pkt_type = IEEE80211_DELBA_MSG; 653 skb_queue_tail(&local->skb_queue, skb); 654 tasklet_schedule(&local->tasklet); 655 } 656 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); 657 658 659 void ieee80211_process_addba_resp(struct ieee80211_local *local, 660 struct sta_info *sta, 661 struct ieee80211_mgmt *mgmt, 662 size_t len) 663 { 664 u16 capab, tid; 665 u8 *state; 666 667 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); 668 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 669 670 state = &sta->ampdu_mlme.tid_state_tx[tid]; 671 672 spin_lock_bh(&sta->lock); 673 674 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 675 spin_unlock_bh(&sta->lock); 676 return; 677 } 678 679 if (mgmt->u.action.u.addba_resp.dialog_token != 680 sta->ampdu_mlme.tid_tx[tid]->dialog_token) { 681 spin_unlock_bh(&sta->lock); 682 #ifdef CONFIG_MAC80211_HT_DEBUG 683 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); 684 #endif /* CONFIG_MAC80211_HT_DEBUG */ 685 return; 686 } 687 688 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 689 #ifdef CONFIG_MAC80211_HT_DEBUG 690 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); 691 #endif /* CONFIG_MAC80211_HT_DEBUG */ 692 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) 693 == WLAN_STATUS_SUCCESS) { 694 u8 curstate = *state; 695 696 *state |= HT_ADDBA_RECEIVED_MSK; 697 698 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) 699 ieee80211_agg_tx_operational(local, sta, tid); 700 701 sta->ampdu_mlme.addba_req_num[tid] = 0; 702 } else { 703 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); 704 } 705 spin_unlock_bh(&sta->lock); 706 } 707