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];
223 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
225 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
226 struct ieee80211_sub_if_data *sdata = sta->sdata;
227 struct ieee80211_local *local = sdata->local;
228 struct tid_ampdu_tx *tid_tx;
232 trace_api_start_tx_ba_session(pubsta, tid);
234 if (WARN_ON(!local->ops->ampdu_action))
237 if ((tid >= STA_TID_NUM) ||
238 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
241 #ifdef CONFIG_MAC80211_HT_DEBUG
242 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
244 #endif /* CONFIG_MAC80211_HT_DEBUG */
247 * The aggregation code is not prepared to handle
248 * anything but STA/AP due to the BSSID handling.
249 * IBSS could work in the code but isn't supported
250 * by drivers or the standard.
252 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
253 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
254 sdata->vif.type != NL80211_IFTYPE_AP)
257 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
258 #ifdef CONFIG_MAC80211_HT_DEBUG
259 printk(KERN_DEBUG "BA sessions blocked. "
260 "Denying BA session request\n");
265 spin_lock_bh(&sta->lock);
266 spin_lock(&local->ampdu_lock);
268 /* we have tried too many times, receiver does not want A-MPDU */
269 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
274 tid_tx = sta->ampdu_mlme.tid_tx[tid];
275 /* check if the TID is not in aggregation flow already */
277 #ifdef CONFIG_MAC80211_HT_DEBUG
278 printk(KERN_DEBUG "BA request denied - session is not "
279 "idle on tid %u\n", tid);
280 #endif /* CONFIG_MAC80211_HT_DEBUG */
286 * While we're asking the driver about the aggregation,
287 * stop the AC queue so that we don't have to worry
288 * about frames that came in while we were doing that,
289 * which would require us to put them to the AC pending
290 * afterwards which just makes the code more complex.
292 ieee80211_stop_queue_by_reason(
293 &local->hw, ieee80211_ac_from_tid(tid),
294 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
296 /* prepare A-MPDU MLME for Tx aggregation */
297 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
299 #ifdef CONFIG_MAC80211_HT_DEBUG
301 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
308 skb_queue_head_init(&tid_tx->pending);
311 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
312 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
313 init_timer(&tid_tx->addba_resp_timer);
315 start_seq_num = sta->tid_seq[tid] >> 4;
317 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
318 pubsta, tid, &start_seq_num);
320 #ifdef CONFIG_MAC80211_HT_DEBUG
321 printk(KERN_DEBUG "BA request denied - HW unavailable for"
323 #endif /* CONFIG_MAC80211_HT_DEBUG */
327 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
329 /* Driver vetoed or OKed, but we can take packets again now */
330 ieee80211_wake_queue_by_reason(
331 &local->hw, ieee80211_ac_from_tid(tid),
332 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
334 spin_unlock(&local->ampdu_lock);
336 /* activate the timer for the recipient's addBA response */
337 tid_tx->addba_resp_timer.expires = jiffies + ADDBA_RESP_INTERVAL;
338 add_timer(&tid_tx->addba_resp_timer);
339 #ifdef CONFIG_MAC80211_HT_DEBUG
340 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
343 /* prepare tid data */
344 sta->ampdu_mlme.dialog_token_allocator++;
345 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
346 tid_tx->ssn = start_seq_num;
348 sta->ampdu_mlme.addba_req_num[tid]++;
350 spin_unlock_bh(&sta->lock);
352 /* send AddBA request */
353 ieee80211_send_addba_request(sdata, pubsta->addr, tid,
354 tid_tx->dialog_token, tid_tx->ssn,
361 ieee80211_wake_queue_by_reason(
362 &local->hw, ieee80211_ac_from_tid(tid),
363 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
365 spin_unlock(&local->ampdu_lock);
366 spin_unlock_bh(&sta->lock);
369 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
372 * splice packets from the STA's pending to the local pending,
373 * requires a call to ieee80211_agg_splice_finish and holding
374 * local->ampdu_lock across both calls.
376 static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
377 struct tid_ampdu_tx *tid_tx,
381 u16 queue = ieee80211_ac_from_tid(tid);
383 ieee80211_stop_queue_by_reason(
385 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
387 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
388 " from the pending queue\n", tid))
391 if (!skb_queue_empty(&tid_tx->pending)) {
392 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
393 /* copy over remaining packets */
394 skb_queue_splice_tail_init(&tid_tx->pending,
395 &local->pending[queue]);
396 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
400 static void ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
402 ieee80211_wake_queue_by_reason(
403 &local->hw, ieee80211_ac_from_tid(tid),
404 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
407 /* caller must hold sta->lock */
408 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
409 struct sta_info *sta, u16 tid)
411 lockdep_assert_held(&sta->lock);
413 #ifdef CONFIG_MAC80211_HT_DEBUG
414 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
417 spin_lock(&local->ampdu_lock);
418 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
420 * Now mark as operational. This will be visible
421 * in the TX path, and lets it go lock-free in
424 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
425 ieee80211_agg_splice_finish(local, tid);
426 spin_unlock(&local->ampdu_lock);
428 drv_ampdu_action(local, sta->sdata,
429 IEEE80211_AMPDU_TX_OPERATIONAL,
430 &sta->sta, tid, NULL);
433 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
435 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
436 struct ieee80211_local *local = sdata->local;
437 struct sta_info *sta;
438 struct tid_ampdu_tx *tid_tx;
440 trace_api_start_tx_ba_cb(sdata, ra, tid);
442 if (tid >= STA_TID_NUM) {
443 #ifdef CONFIG_MAC80211_HT_DEBUG
444 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
451 sta = sta_info_get(sdata, ra);
454 #ifdef CONFIG_MAC80211_HT_DEBUG
455 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
460 spin_lock_bh(&sta->lock);
461 tid_tx = sta->ampdu_mlme.tid_tx[tid];
463 if (WARN_ON(!tid_tx)) {
464 #ifdef CONFIG_MAC80211_HT_DEBUG
465 printk(KERN_DEBUG "addBA was not requested!\n");
467 spin_unlock_bh(&sta->lock);
472 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
475 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
476 ieee80211_agg_tx_operational(local, sta, tid);
479 spin_unlock_bh(&sta->lock);
483 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
484 const u8 *ra, u16 tid)
486 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
487 struct ieee80211_local *local = sdata->local;
488 struct ieee80211_ra_tid *ra_tid;
489 struct sk_buff *skb = dev_alloc_skb(0);
491 if (unlikely(!skb)) {
492 #ifdef CONFIG_MAC80211_HT_DEBUG
494 printk(KERN_WARNING "%s: Not enough memory, "
495 "dropping start BA session", sdata->name);
499 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
500 memcpy(&ra_tid->ra, ra, ETH_ALEN);
503 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
504 skb_queue_tail(&sdata->skb_queue, skb);
505 ieee80211_queue_work(&local->hw, &sdata->work);
507 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
509 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
510 enum ieee80211_back_parties initiator)
512 struct tid_ampdu_tx *tid_tx;
515 spin_lock_bh(&sta->lock);
516 tid_tx = sta->ampdu_mlme.tid_tx[tid];
518 /* check if the TID is in aggregation */
519 if (!tid_tx || !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
524 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
527 spin_unlock_bh(&sta->lock);
531 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
533 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
534 struct ieee80211_sub_if_data *sdata = sta->sdata;
535 struct ieee80211_local *local = sdata->local;
537 trace_api_stop_tx_ba_session(pubsta, tid);
539 if (!local->ops->ampdu_action)
542 if (tid >= STA_TID_NUM)
545 return __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
547 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
549 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
551 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
552 struct ieee80211_local *local = sdata->local;
553 struct sta_info *sta;
554 struct tid_ampdu_tx *tid_tx;
556 trace_api_stop_tx_ba_cb(sdata, ra, tid);
558 if (tid >= STA_TID_NUM) {
559 #ifdef CONFIG_MAC80211_HT_DEBUG
560 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
566 #ifdef CONFIG_MAC80211_HT_DEBUG
567 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
569 #endif /* CONFIG_MAC80211_HT_DEBUG */
572 sta = sta_info_get(sdata, ra);
574 #ifdef CONFIG_MAC80211_HT_DEBUG
575 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
581 spin_lock_bh(&sta->lock);
582 tid_tx = sta->ampdu_mlme.tid_tx[tid];
584 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
585 #ifdef CONFIG_MAC80211_HT_DEBUG
586 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
588 spin_unlock_bh(&sta->lock);
593 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
594 ieee80211_send_delba(sta->sdata, ra, tid,
595 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
598 * When we get here, the TX path will not be lockless any more wrt.
599 * aggregation, since the OPERATIONAL bit has long been cleared.
600 * Thus it will block on getting the lock, if it occurs. So if we
601 * stop the queue now, we will not get any more packets, and any
602 * that might be being processed will wait for us here, thereby
603 * guaranteeing that no packets go to the tid_tx pending queue any
607 spin_lock(&local->ampdu_lock);
608 ieee80211_agg_splice_packets(local, tid_tx, tid);
610 /* future packets must not find the tid_tx struct any more */
611 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
613 ieee80211_agg_splice_finish(local, tid);
615 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
616 spin_unlock(&local->ampdu_lock);
618 spin_unlock_bh(&sta->lock);
622 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
623 const u8 *ra, u16 tid)
625 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
626 struct ieee80211_local *local = sdata->local;
627 struct ieee80211_ra_tid *ra_tid;
628 struct sk_buff *skb = dev_alloc_skb(0);
630 if (unlikely(!skb)) {
631 #ifdef CONFIG_MAC80211_HT_DEBUG
633 printk(KERN_WARNING "%s: Not enough memory, "
634 "dropping stop BA session", sdata->name);
638 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
639 memcpy(&ra_tid->ra, ra, ETH_ALEN);
642 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
643 skb_queue_tail(&sdata->skb_queue, skb);
644 ieee80211_queue_work(&local->hw, &sdata->work);
646 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
649 void ieee80211_process_addba_resp(struct ieee80211_local *local,
650 struct sta_info *sta,
651 struct ieee80211_mgmt *mgmt,
654 struct tid_ampdu_tx *tid_tx;
657 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
658 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
660 spin_lock_bh(&sta->lock);
662 tid_tx = sta->ampdu_mlme.tid_tx[tid];
667 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
668 #ifdef CONFIG_MAC80211_HT_DEBUG
669 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
674 del_timer(&tid_tx->addba_resp_timer);
676 #ifdef CONFIG_MAC80211_HT_DEBUG
677 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
680 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
681 == WLAN_STATUS_SUCCESS) {
682 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
684 /* ignore duplicate response */
688 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
689 ieee80211_agg_tx_operational(local, sta, tid);
691 sta->ampdu_mlme.addba_req_num[tid] = 0;
693 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
697 spin_unlock_bh(&sta->lock);