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
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.
16 #include <linux/ieee80211.h>
17 #include <linux/slab.h>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
20 #include "driver-ops.h"
26 * Aggregation on the TX side requires setting the hardware flag
27 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
28 * hardware parameter to the number of hardware AMPDU queues. If there are no
29 * hardware queues then the driver will (currently) have to do all frame
32 * When TX aggregation is started by some subsystem (usually the rate control
33 * algorithm would be appropriate) by calling the
34 * ieee80211_start_tx_ba_session() function, the driver will be notified via
35 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
37 * In response to that, the driver is later required to call the
38 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
39 * function, which will start the aggregation session.
41 * Similarly, when the aggregation session is stopped by
42 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
43 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
44 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
45 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
48 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
49 const u8 *da, u16 tid,
50 u8 dialog_token, u16 start_seq_num,
51 u16 agg_size, u16 timeout)
53 struct ieee80211_local *local = sdata->local;
55 struct ieee80211_mgmt *mgmt;
58 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
61 printk(KERN_ERR "%s: failed to allocate buffer "
62 "for addba request frame\n", sdata->name);
65 skb_reserve(skb, local->hw.extra_tx_headroom);
66 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
68 memcpy(mgmt->da, da, ETH_ALEN);
69 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
70 if (sdata->vif.type == NL80211_IFTYPE_AP ||
71 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
72 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
73 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
74 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_ACTION);
79 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
81 mgmt->u.action.category = WLAN_CATEGORY_BACK;
82 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
84 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
85 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
86 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
87 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
89 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
91 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
92 mgmt->u.action.u.addba_req.start_seq_num =
93 cpu_to_le16(start_seq_num << 4);
95 ieee80211_tx_skb(sdata, skb);
98 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
100 struct ieee80211_local *local = sdata->local;
102 struct ieee80211_bar *bar;
105 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
107 printk(KERN_ERR "%s: failed to allocate buffer for "
108 "bar frame\n", sdata->name);
111 skb_reserve(skb, local->hw.extra_tx_headroom);
112 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
113 memset(bar, 0, sizeof(*bar));
114 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
115 IEEE80211_STYPE_BACK_REQ);
116 memcpy(bar->ra, ra, ETH_ALEN);
117 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
118 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
119 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
120 bar_control |= (u16)(tid << 12);
121 bar->control = cpu_to_le16(bar_control);
122 bar->start_seq_num = cpu_to_le16(ssn);
124 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
125 ieee80211_tx_skb(sdata, skb);
128 static void kfree_tid_tx(struct rcu_head *rcu_head)
130 struct tid_ampdu_tx *tid_tx =
131 container_of(rcu_head, struct tid_ampdu_tx, rcu_head);
136 static int ___ieee80211_stop_tx_ba_session(
137 struct sta_info *sta, u16 tid,
138 enum ieee80211_back_parties initiator)
140 struct ieee80211_local *local = sta->local;
141 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
144 lockdep_assert_held(&sta->lock);
146 if (WARN_ON(!tid_tx))
149 #ifdef CONFIG_MAC80211_HT_DEBUG
150 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
152 #endif /* CONFIG_MAC80211_HT_DEBUG */
154 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
157 * After this packets are no longer handed right through
158 * to the driver but are put onto tid_tx->pending instead,
159 * with locking to ensure proper access.
161 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
163 tid_tx->stop_initiator = initiator;
165 ret = drv_ampdu_action(local, sta->sdata,
166 IEEE80211_AMPDU_TX_STOP,
167 &sta->sta, tid, NULL);
169 /* HW shall not deny going back to legacy */
172 * We may have pending packets get stuck in this case...
173 * Not bothering with a workaround for now.
181 * After sending add Block Ack request we activated a timer until
182 * add Block Ack response will arrive from the recipient.
183 * If this timer expires sta_addba_resp_timer_expired will be executed.
185 static void sta_addba_resp_timer_expired(unsigned long data)
187 /* not an elegant detour, but there is no choice as the timer passes
188 * only one argument, and both sta_info and TID are needed, so init
189 * flow in sta_info_create gives the TID as data, while the timer_to_id
190 * array gives the sta through container_of */
191 u16 tid = *(u8 *)data;
192 struct sta_info *sta = container_of((void *)data,
193 struct sta_info, timer_to_tid[tid]);
194 struct tid_ampdu_tx *tid_tx;
196 /* check if the TID waits for addBA response */
197 spin_lock_bh(&sta->lock);
198 tid_tx = sta->ampdu_mlme.tid_tx[tid];
200 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
201 spin_unlock_bh(&sta->lock);
202 #ifdef CONFIG_MAC80211_HT_DEBUG
203 printk(KERN_DEBUG "timer expired on tid %d but we are not "
204 "(or no longer) expecting addBA response there\n",
210 #ifdef CONFIG_MAC80211_HT_DEBUG
211 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
214 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
215 spin_unlock_bh(&sta->lock);
218 static inline int ieee80211_ac_from_tid(int tid)
220 return ieee802_1d_to_ac[tid & 7];
224 * When multiple aggregation sessions on multiple stations
225 * are being created/destroyed simultaneously, we need to
226 * refcount the global queue stop caused by that in order
227 * to not get into a situation where one of the aggregation
228 * setup or teardown re-enables queues before the other is
229 * ready to handle that.
231 * These two functions take care of this issue by keeping
232 * a global "agg_queue_stop" refcount.
234 static void __acquires(agg_queue)
235 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
237 int queue = ieee80211_ac_from_tid(tid);
239 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
240 ieee80211_stop_queue_by_reason(
242 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
243 __acquire(agg_queue);
246 static void __releases(agg_queue)
247 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
249 int queue = ieee80211_ac_from_tid(tid);
251 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
252 ieee80211_wake_queue_by_reason(
254 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
255 __release(agg_queue);
258 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
260 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
261 struct ieee80211_sub_if_data *sdata = sta->sdata;
262 struct ieee80211_local *local = sdata->local;
263 struct tid_ampdu_tx *tid_tx;
267 trace_api_start_tx_ba_session(pubsta, tid);
269 if (WARN_ON(!local->ops->ampdu_action))
272 if ((tid >= STA_TID_NUM) ||
273 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
276 #ifdef CONFIG_MAC80211_HT_DEBUG
277 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
279 #endif /* CONFIG_MAC80211_HT_DEBUG */
282 * The aggregation code is not prepared to handle
283 * anything but STA/AP due to the BSSID handling.
284 * IBSS could work in the code but isn't supported
285 * by drivers or the standard.
287 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
288 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
289 sdata->vif.type != NL80211_IFTYPE_AP)
292 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
293 #ifdef CONFIG_MAC80211_HT_DEBUG
294 printk(KERN_DEBUG "BA sessions blocked. "
295 "Denying BA session request\n");
300 spin_lock_bh(&sta->lock);
302 /* we have tried too many times, receiver does not want A-MPDU */
303 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
308 tid_tx = sta->ampdu_mlme.tid_tx[tid];
309 /* check if the TID is not in aggregation flow already */
311 #ifdef CONFIG_MAC80211_HT_DEBUG
312 printk(KERN_DEBUG "BA request denied - session is not "
313 "idle on tid %u\n", tid);
314 #endif /* CONFIG_MAC80211_HT_DEBUG */
320 * While we're asking the driver about the aggregation,
321 * stop the AC queue so that we don't have to worry
322 * about frames that came in while we were doing that,
323 * which would require us to put them to the AC pending
324 * afterwards which just makes the code more complex.
326 ieee80211_stop_queue_agg(local, tid);
328 /* prepare A-MPDU MLME for Tx aggregation */
329 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
331 #ifdef CONFIG_MAC80211_HT_DEBUG
333 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
340 skb_queue_head_init(&tid_tx->pending);
343 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
344 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
345 init_timer(&tid_tx->addba_resp_timer);
347 start_seq_num = sta->tid_seq[tid] >> 4;
349 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
350 pubsta, tid, &start_seq_num);
352 #ifdef CONFIG_MAC80211_HT_DEBUG
353 printk(KERN_DEBUG "BA request denied - HW unavailable for"
355 #endif /* CONFIG_MAC80211_HT_DEBUG */
359 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
361 /* Driver vetoed or OKed, but we can take packets again now */
362 ieee80211_wake_queue_agg(local, tid);
364 /* activate the timer for the recipient's addBA response */
365 tid_tx->addba_resp_timer.expires = jiffies + ADDBA_RESP_INTERVAL;
366 add_timer(&tid_tx->addba_resp_timer);
367 #ifdef CONFIG_MAC80211_HT_DEBUG
368 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
371 /* prepare tid data */
372 sta->ampdu_mlme.dialog_token_allocator++;
373 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
374 tid_tx->ssn = start_seq_num;
376 sta->ampdu_mlme.addba_req_num[tid]++;
378 spin_unlock_bh(&sta->lock);
380 /* send AddBA request */
381 ieee80211_send_addba_request(sdata, pubsta->addr, tid,
382 tid_tx->dialog_token, tid_tx->ssn,
389 ieee80211_wake_queue_agg(local, tid);
391 spin_unlock_bh(&sta->lock);
394 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
397 * splice packets from the STA's pending to the local pending,
398 * requires a call to ieee80211_agg_splice_finish later
400 static void __acquires(agg_queue)
401 ieee80211_agg_splice_packets(struct ieee80211_local *local,
402 struct tid_ampdu_tx *tid_tx, u16 tid)
404 int queue = ieee80211_ac_from_tid(tid);
407 ieee80211_stop_queue_agg(local, tid);
409 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
410 " from the pending queue\n", tid))
413 if (!skb_queue_empty(&tid_tx->pending)) {
414 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
415 /* copy over remaining packets */
416 skb_queue_splice_tail_init(&tid_tx->pending,
417 &local->pending[queue]);
418 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
422 static void __releases(agg_queue)
423 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
425 ieee80211_wake_queue_agg(local, tid);
428 /* caller must hold sta->lock */
429 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
430 struct sta_info *sta, u16 tid)
432 lockdep_assert_held(&sta->lock);
434 #ifdef CONFIG_MAC80211_HT_DEBUG
435 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
438 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
440 * Now mark as operational. This will be visible
441 * in the TX path, and lets it go lock-free in
444 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
445 ieee80211_agg_splice_finish(local, tid);
447 drv_ampdu_action(local, sta->sdata,
448 IEEE80211_AMPDU_TX_OPERATIONAL,
449 &sta->sta, tid, NULL);
452 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
454 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
455 struct ieee80211_local *local = sdata->local;
456 struct sta_info *sta;
457 struct tid_ampdu_tx *tid_tx;
459 trace_api_start_tx_ba_cb(sdata, ra, tid);
461 if (tid >= STA_TID_NUM) {
462 #ifdef CONFIG_MAC80211_HT_DEBUG
463 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
470 sta = sta_info_get(sdata, ra);
473 #ifdef CONFIG_MAC80211_HT_DEBUG
474 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
479 spin_lock_bh(&sta->lock);
480 tid_tx = sta->ampdu_mlme.tid_tx[tid];
482 if (WARN_ON(!tid_tx)) {
483 #ifdef CONFIG_MAC80211_HT_DEBUG
484 printk(KERN_DEBUG "addBA was not requested!\n");
486 spin_unlock_bh(&sta->lock);
491 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
494 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
495 ieee80211_agg_tx_operational(local, sta, tid);
498 spin_unlock_bh(&sta->lock);
502 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
503 const u8 *ra, u16 tid)
505 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
506 struct ieee80211_local *local = sdata->local;
507 struct ieee80211_ra_tid *ra_tid;
508 struct sk_buff *skb = dev_alloc_skb(0);
510 if (unlikely(!skb)) {
511 #ifdef CONFIG_MAC80211_HT_DEBUG
513 printk(KERN_WARNING "%s: Not enough memory, "
514 "dropping start BA session", sdata->name);
518 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
519 memcpy(&ra_tid->ra, ra, ETH_ALEN);
522 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
523 skb_queue_tail(&sdata->skb_queue, skb);
524 ieee80211_queue_work(&local->hw, &sdata->work);
526 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
528 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
529 enum ieee80211_back_parties initiator)
531 struct tid_ampdu_tx *tid_tx;
534 spin_lock_bh(&sta->lock);
535 tid_tx = sta->ampdu_mlme.tid_tx[tid];
537 /* check if the TID is in aggregation */
538 if (!tid_tx || !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
543 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
546 spin_unlock_bh(&sta->lock);
550 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
552 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
553 struct ieee80211_sub_if_data *sdata = sta->sdata;
554 struct ieee80211_local *local = sdata->local;
556 trace_api_stop_tx_ba_session(pubsta, tid);
558 if (!local->ops->ampdu_action)
561 if (tid >= STA_TID_NUM)
564 return __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
566 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
568 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
570 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
571 struct ieee80211_local *local = sdata->local;
572 struct sta_info *sta;
573 struct tid_ampdu_tx *tid_tx;
575 trace_api_stop_tx_ba_cb(sdata, ra, tid);
577 if (tid >= STA_TID_NUM) {
578 #ifdef CONFIG_MAC80211_HT_DEBUG
579 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
585 #ifdef CONFIG_MAC80211_HT_DEBUG
586 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
588 #endif /* CONFIG_MAC80211_HT_DEBUG */
591 sta = sta_info_get(sdata, ra);
593 #ifdef CONFIG_MAC80211_HT_DEBUG
594 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
600 spin_lock_bh(&sta->lock);
601 tid_tx = sta->ampdu_mlme.tid_tx[tid];
603 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
604 #ifdef CONFIG_MAC80211_HT_DEBUG
605 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
607 spin_unlock_bh(&sta->lock);
612 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
613 ieee80211_send_delba(sta->sdata, ra, tid,
614 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
617 * When we get here, the TX path will not be lockless any more wrt.
618 * aggregation, since the OPERATIONAL bit has long been cleared.
619 * Thus it will block on getting the lock, if it occurs. So if we
620 * stop the queue now, we will not get any more packets, and any
621 * that might be being processed will wait for us here, thereby
622 * guaranteeing that no packets go to the tid_tx pending queue any
626 ieee80211_agg_splice_packets(local, tid_tx, tid);
628 /* future packets must not find the tid_tx struct any more */
629 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
631 ieee80211_agg_splice_finish(local, tid);
633 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
635 spin_unlock_bh(&sta->lock);
639 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
640 const u8 *ra, u16 tid)
642 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
643 struct ieee80211_local *local = sdata->local;
644 struct ieee80211_ra_tid *ra_tid;
645 struct sk_buff *skb = dev_alloc_skb(0);
647 if (unlikely(!skb)) {
648 #ifdef CONFIG_MAC80211_HT_DEBUG
650 printk(KERN_WARNING "%s: Not enough memory, "
651 "dropping stop BA session", sdata->name);
655 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
656 memcpy(&ra_tid->ra, ra, ETH_ALEN);
659 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
660 skb_queue_tail(&sdata->skb_queue, skb);
661 ieee80211_queue_work(&local->hw, &sdata->work);
663 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
666 void ieee80211_process_addba_resp(struct ieee80211_local *local,
667 struct sta_info *sta,
668 struct ieee80211_mgmt *mgmt,
671 struct tid_ampdu_tx *tid_tx;
674 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
675 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
677 spin_lock_bh(&sta->lock);
679 tid_tx = sta->ampdu_mlme.tid_tx[tid];
684 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
685 #ifdef CONFIG_MAC80211_HT_DEBUG
686 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
691 del_timer(&tid_tx->addba_resp_timer);
693 #ifdef CONFIG_MAC80211_HT_DEBUG
694 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
697 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
698 == WLAN_STATUS_SUCCESS) {
699 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
701 /* ignore duplicate response */
705 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
706 ieee80211_agg_tx_operational(local, sta, tid);
708 sta->ampdu_mlme.addba_req_num[tid] = 0;
710 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
714 spin_unlock_bh(&sta->lock);