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 <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "driver-ops.h"
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
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.
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.
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()).
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)
52 struct ieee80211_local *local = sdata->local;
54 struct ieee80211_mgmt *mgmt;
57 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
60 printk(KERN_ERR "%s: failed to allocate buffer "
61 "for addba request frame\n", sdata->dev->name);
64 skb_reserve(skb, local->hw.extra_tx_headroom);
65 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 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);
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_ACTION);
78 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
80 mgmt->u.action.category = WLAN_CATEGORY_BACK;
81 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
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 */
88 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
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);
94 ieee80211_tx_skb(sdata, skb);
97 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
99 struct ieee80211_local *local = sdata->local;
101 struct ieee80211_bar *bar;
104 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
106 printk(KERN_ERR "%s: failed to allocate buffer for "
107 "bar frame\n", sdata->dev->name);
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);
123 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
124 ieee80211_tx_skb(sdata, skb);
127 static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
128 enum ieee80211_back_parties initiator)
130 struct ieee80211_local *local = sta->local;
134 state = &sta->ampdu_mlme.tid_state_tx[tid];
136 if (*state == HT_AGG_STATE_OPERATIONAL)
137 sta->ampdu_mlme.addba_req_num[tid] = 0;
139 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
140 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
142 ret = drv_ampdu_action(local, &sta->sdata->vif,
143 IEEE80211_AMPDU_TX_STOP,
144 &sta->sta, tid, NULL);
146 /* HW shall not deny going back to legacy */
148 *state = HT_AGG_STATE_OPERATIONAL;
150 * We may have pending packets get stuck in this case...
151 * Not bothering with a workaround for now.
159 * After sending add Block Ack request we activated a timer until
160 * add Block Ack response will arrive from the recipient.
161 * If this timer expires sta_addba_resp_timer_expired will be executed.
163 static void sta_addba_resp_timer_expired(unsigned long data)
165 /* not an elegant detour, but there is no choice as the timer passes
166 * only one argument, and both sta_info and TID are needed, so init
167 * flow in sta_info_create gives the TID as data, while the timer_to_id
168 * array gives the sta through container_of */
169 u16 tid = *(u8 *)data;
170 struct sta_info *sta = container_of((void *)data,
171 struct sta_info, timer_to_tid[tid]);
174 state = &sta->ampdu_mlme.tid_state_tx[tid];
176 /* check if the TID waits for addBA response */
177 spin_lock_bh(&sta->lock);
178 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
179 spin_unlock_bh(&sta->lock);
180 *state = HT_AGG_STATE_IDLE;
181 #ifdef CONFIG_MAC80211_HT_DEBUG
182 printk(KERN_DEBUG "timer expired on tid %d but we are not "
183 "expecting addBA response there", tid);
188 #ifdef CONFIG_MAC80211_HT_DEBUG
189 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
192 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
193 spin_unlock_bh(&sta->lock);
196 static inline int ieee80211_ac_from_tid(int tid)
198 return ieee802_1d_to_ac[tid & 7];
201 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
203 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
204 struct ieee80211_sub_if_data *sdata = sta->sdata;
205 struct ieee80211_local *local = sdata->local;
210 if (WARN_ON(!local->ops->ampdu_action))
213 if ((tid >= STA_TID_NUM) ||
214 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
217 #ifdef CONFIG_MAC80211_HT_DEBUG
218 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
220 #endif /* CONFIG_MAC80211_HT_DEBUG */
223 * The aggregation code is not prepared to handle
224 * anything but STA/AP due to the BSSID handling.
225 * IBSS could work in the code but isn't supported
226 * by drivers or the standard.
228 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
229 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
230 sdata->vif.type != NL80211_IFTYPE_AP)
233 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
234 #ifdef CONFIG_MAC80211_HT_DEBUG
235 printk(KERN_DEBUG "Suspend in progress. "
236 "Denying BA session request\n");
241 spin_lock_bh(&sta->lock);
242 spin_lock(&local->ampdu_lock);
244 /* we have tried too many times, receiver does not want A-MPDU */
245 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
250 state = &sta->ampdu_mlme.tid_state_tx[tid];
251 /* check if the TID is not in aggregation flow already */
252 if (*state != HT_AGG_STATE_IDLE) {
253 #ifdef CONFIG_MAC80211_HT_DEBUG
254 printk(KERN_DEBUG "BA request denied - session is not "
255 "idle on tid %u\n", tid);
256 #endif /* CONFIG_MAC80211_HT_DEBUG */
262 * While we're asking the driver about the aggregation,
263 * stop the AC queue so that we don't have to worry
264 * about frames that came in while we were doing that,
265 * which would require us to put them to the AC pending
266 * afterwards which just makes the code more complex.
268 ieee80211_stop_queue_by_reason(
269 &local->hw, ieee80211_ac_from_tid(tid),
270 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
272 /* prepare A-MPDU MLME for Tx aggregation */
273 sta->ampdu_mlme.tid_tx[tid] =
274 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
275 if (!sta->ampdu_mlme.tid_tx[tid]) {
276 #ifdef CONFIG_MAC80211_HT_DEBUG
278 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
285 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending);
288 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
289 sta_addba_resp_timer_expired;
290 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
291 (unsigned long)&sta->timer_to_tid[tid];
292 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
294 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
295 * call back right away, it must see that the flow has begun */
296 *state |= HT_ADDBA_REQUESTED_MSK;
298 start_seq_num = sta->tid_seq[tid];
300 ret = drv_ampdu_action(local, &sdata->vif,
301 IEEE80211_AMPDU_TX_START,
302 pubsta, tid, &start_seq_num);
305 #ifdef CONFIG_MAC80211_HT_DEBUG
306 printk(KERN_DEBUG "BA request denied - HW unavailable for"
308 #endif /* CONFIG_MAC80211_HT_DEBUG */
309 *state = HT_AGG_STATE_IDLE;
313 /* Driver vetoed or OKed, but we can take packets again now */
314 ieee80211_wake_queue_by_reason(
315 &local->hw, ieee80211_ac_from_tid(tid),
316 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
318 spin_unlock(&local->ampdu_lock);
319 spin_unlock_bh(&sta->lock);
321 /* send an addBA request */
322 sta->ampdu_mlme.dialog_token_allocator++;
323 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
324 sta->ampdu_mlme.dialog_token_allocator;
325 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
327 ieee80211_send_addba_request(sdata, pubsta->addr, tid,
328 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
329 sta->ampdu_mlme.tid_tx[tid]->ssn,
331 sta->ampdu_mlme.addba_req_num[tid]++;
332 /* activate the timer for the recipient's addBA response */
333 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
334 jiffies + ADDBA_RESP_INTERVAL;
335 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
336 #ifdef CONFIG_MAC80211_HT_DEBUG
337 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
342 kfree(sta->ampdu_mlme.tid_tx[tid]);
343 sta->ampdu_mlme.tid_tx[tid] = NULL;
345 ieee80211_wake_queue_by_reason(
346 &local->hw, ieee80211_ac_from_tid(tid),
347 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
349 spin_unlock(&local->ampdu_lock);
350 spin_unlock_bh(&sta->lock);
353 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
356 * splice packets from the STA's pending to the local pending,
357 * requires a call to ieee80211_agg_splice_finish and holding
358 * local->ampdu_lock across both calls.
360 static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
361 struct sta_info *sta, u16 tid)
364 u16 queue = ieee80211_ac_from_tid(tid);
366 ieee80211_stop_queue_by_reason(
368 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
370 if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK))
373 if (WARN(!sta->ampdu_mlme.tid_tx[tid],
374 "TID %d gone but expected when splicing aggregates from"
375 "the pending queue\n", tid))
378 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) {
379 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
380 /* copy over remaining packets */
381 skb_queue_splice_tail_init(
382 &sta->ampdu_mlme.tid_tx[tid]->pending,
383 &local->pending[queue]);
384 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
388 static void ieee80211_agg_splice_finish(struct ieee80211_local *local,
389 struct sta_info *sta, u16 tid)
391 u16 queue = ieee80211_ac_from_tid(tid);
393 ieee80211_wake_queue_by_reason(
395 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
398 /* caller must hold sta->lock */
399 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
400 struct sta_info *sta, u16 tid)
402 #ifdef CONFIG_MAC80211_HT_DEBUG
403 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
406 spin_lock(&local->ampdu_lock);
407 ieee80211_agg_splice_packets(local, sta, tid);
409 * NB: we rely on sta->lock being taken in the TX
410 * processing here when adding to the pending queue,
411 * otherwise we could only change the state of the
412 * session to OPERATIONAL _here_.
414 ieee80211_agg_splice_finish(local, sta, tid);
415 spin_unlock(&local->ampdu_lock);
417 drv_ampdu_action(local, &sta->sdata->vif,
418 IEEE80211_AMPDU_TX_OPERATIONAL,
419 &sta->sta, tid, NULL);
422 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
424 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
425 struct ieee80211_local *local = sdata->local;
426 struct sta_info *sta;
429 if (tid >= STA_TID_NUM) {
430 #ifdef CONFIG_MAC80211_HT_DEBUG
431 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
438 sta = sta_info_get(local, ra);
441 #ifdef CONFIG_MAC80211_HT_DEBUG
442 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
447 state = &sta->ampdu_mlme.tid_state_tx[tid];
448 spin_lock_bh(&sta->lock);
450 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) {
451 #ifdef CONFIG_MAC80211_HT_DEBUG
452 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
455 spin_unlock_bh(&sta->lock);
460 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK))
463 *state |= HT_ADDBA_DRV_READY_MSK;
465 if (*state == HT_AGG_STATE_OPERATIONAL)
466 ieee80211_agg_tx_operational(local, sta, tid);
469 spin_unlock_bh(&sta->lock);
472 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
474 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
475 const u8 *ra, u16 tid)
477 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
478 struct ieee80211_local *local = sdata->local;
479 struct ieee80211_ra_tid *ra_tid;
480 struct sk_buff *skb = dev_alloc_skb(0);
482 if (unlikely(!skb)) {
483 #ifdef CONFIG_MAC80211_HT_DEBUG
485 printk(KERN_WARNING "%s: Not enough memory, "
486 "dropping start BA session", skb->dev->name);
490 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
491 memcpy(&ra_tid->ra, ra, ETH_ALEN);
495 skb->pkt_type = IEEE80211_ADDBA_MSG;
496 skb_queue_tail(&local->skb_queue, skb);
497 tasklet_schedule(&local->tasklet);
499 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
501 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
502 enum ieee80211_back_parties initiator)
507 /* check if the TID is in aggregation */
508 state = &sta->ampdu_mlme.tid_state_tx[tid];
509 spin_lock_bh(&sta->lock);
511 if (*state != HT_AGG_STATE_OPERATIONAL) {
516 #ifdef CONFIG_MAC80211_HT_DEBUG
517 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
519 #endif /* CONFIG_MAC80211_HT_DEBUG */
521 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
524 spin_unlock_bh(&sta->lock);
528 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
529 enum ieee80211_back_parties initiator)
531 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
532 struct ieee80211_sub_if_data *sdata = sta->sdata;
533 struct ieee80211_local *local = sdata->local;
535 if (WARN_ON(!local->ops->ampdu_action))
538 if (tid >= STA_TID_NUM)
541 return __ieee80211_stop_tx_ba_session(sta, tid, initiator);
543 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
545 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
547 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
548 struct ieee80211_local *local = sdata->local;
549 struct sta_info *sta;
552 if (tid >= STA_TID_NUM) {
553 #ifdef CONFIG_MAC80211_HT_DEBUG
554 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
560 #ifdef CONFIG_MAC80211_HT_DEBUG
561 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
563 #endif /* CONFIG_MAC80211_HT_DEBUG */
566 sta = sta_info_get(local, ra);
568 #ifdef CONFIG_MAC80211_HT_DEBUG
569 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
574 state = &sta->ampdu_mlme.tid_state_tx[tid];
576 /* NOTE: no need to use sta->lock in this state check, as
577 * ieee80211_stop_tx_ba_session will let only one stop call to
578 * pass through per sta/tid
580 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
588 if (*state & HT_AGG_STATE_INITIATOR_MSK)
589 ieee80211_send_delba(sta->sdata, ra, tid,
590 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
592 spin_lock_bh(&sta->lock);
593 spin_lock(&local->ampdu_lock);
595 ieee80211_agg_splice_packets(local, sta, tid);
597 *state = HT_AGG_STATE_IDLE;
598 /* from now on packets are no longer put onto sta->pending */
599 kfree(sta->ampdu_mlme.tid_tx[tid]);
600 sta->ampdu_mlme.tid_tx[tid] = NULL;
602 ieee80211_agg_splice_finish(local, sta, tid);
604 spin_unlock(&local->ampdu_lock);
605 spin_unlock_bh(&sta->lock);
609 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
611 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
612 const u8 *ra, u16 tid)
614 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
615 struct ieee80211_local *local = sdata->local;
616 struct ieee80211_ra_tid *ra_tid;
617 struct sk_buff *skb = dev_alloc_skb(0);
619 if (unlikely(!skb)) {
620 #ifdef CONFIG_MAC80211_HT_DEBUG
622 printk(KERN_WARNING "%s: Not enough memory, "
623 "dropping stop BA session", skb->dev->name);
627 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
628 memcpy(&ra_tid->ra, ra, ETH_ALEN);
632 skb->pkt_type = IEEE80211_DELBA_MSG;
633 skb_queue_tail(&local->skb_queue, skb);
634 tasklet_schedule(&local->tasklet);
636 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
639 void ieee80211_process_addba_resp(struct ieee80211_local *local,
640 struct sta_info *sta,
641 struct ieee80211_mgmt *mgmt,
647 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
648 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
650 state = &sta->ampdu_mlme.tid_state_tx[tid];
652 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
654 spin_lock_bh(&sta->lock);
656 if (!(*state & HT_ADDBA_REQUESTED_MSK))
657 goto timer_still_needed;
659 if (mgmt->u.action.u.addba_resp.dialog_token !=
660 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
661 #ifdef CONFIG_MAC80211_HT_DEBUG
662 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
663 #endif /* CONFIG_MAC80211_HT_DEBUG */
664 goto timer_still_needed;
667 #ifdef CONFIG_MAC80211_HT_DEBUG
668 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
669 #endif /* CONFIG_MAC80211_HT_DEBUG */
671 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
672 == WLAN_STATUS_SUCCESS) {
673 u8 curstate = *state;
675 *state |= HT_ADDBA_RECEIVED_MSK;
677 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL)
678 ieee80211_agg_tx_operational(local, sta, tid);
680 sta->ampdu_mlme.addba_req_num[tid] = 0;
682 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
688 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
690 spin_unlock_bh(&sta->lock);