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 2007-2010, 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 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
137 enum ieee80211_back_parties initiator)
139 struct ieee80211_local *local = sta->local;
140 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
143 lockdep_assert_held(&sta->ampdu_mlme.mtx);
148 spin_lock_bh(&sta->lock);
150 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
151 /* not even started yet! */
152 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
153 spin_unlock_bh(&sta->lock);
154 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
158 spin_unlock_bh(&sta->lock);
160 #ifdef CONFIG_MAC80211_HT_DEBUG
161 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
163 #endif /* CONFIG_MAC80211_HT_DEBUG */
165 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
168 * After this packets are no longer handed right through
169 * to the driver but are put onto tid_tx->pending instead,
170 * with locking to ensure proper access.
172 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
174 tid_tx->stop_initiator = initiator;
176 ret = drv_ampdu_action(local, sta->sdata,
177 IEEE80211_AMPDU_TX_STOP,
178 &sta->sta, tid, NULL);
180 /* HW shall not deny going back to legacy */
183 * We may have pending packets get stuck in this case...
184 * Not bothering with a workaround for now.
192 * After sending add Block Ack request we activated a timer until
193 * add Block Ack response will arrive from the recipient.
194 * If this timer expires sta_addba_resp_timer_expired will be executed.
196 static void sta_addba_resp_timer_expired(unsigned long data)
198 /* not an elegant detour, but there is no choice as the timer passes
199 * only one argument, and both sta_info and TID are needed, so init
200 * flow in sta_info_create gives the TID as data, while the timer_to_id
201 * array gives the sta through container_of */
202 u16 tid = *(u8 *)data;
203 struct sta_info *sta = container_of((void *)data,
204 struct sta_info, timer_to_tid[tid]);
205 struct tid_ampdu_tx *tid_tx;
207 /* check if the TID waits for addBA response */
209 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
211 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
213 #ifdef CONFIG_MAC80211_HT_DEBUG
214 printk(KERN_DEBUG "timer expired on tid %d but we are not "
215 "(or no longer) expecting addBA response there\n",
221 #ifdef CONFIG_MAC80211_HT_DEBUG
222 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
225 ieee80211_stop_tx_ba_session(&sta->sta, tid);
229 static inline int ieee80211_ac_from_tid(int tid)
231 return ieee802_1d_to_ac[tid & 7];
235 * When multiple aggregation sessions on multiple stations
236 * are being created/destroyed simultaneously, we need to
237 * refcount the global queue stop caused by that in order
238 * to not get into a situation where one of the aggregation
239 * setup or teardown re-enables queues before the other is
240 * ready to handle that.
242 * These two functions take care of this issue by keeping
243 * a global "agg_queue_stop" refcount.
245 static void __acquires(agg_queue)
246 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
248 int queue = ieee80211_ac_from_tid(tid);
250 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
251 ieee80211_stop_queue_by_reason(
253 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
254 __acquire(agg_queue);
257 static void __releases(agg_queue)
258 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
260 int queue = ieee80211_ac_from_tid(tid);
262 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
263 ieee80211_wake_queue_by_reason(
265 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
266 __release(agg_queue);
269 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
271 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
272 struct ieee80211_local *local = sta->local;
273 struct ieee80211_sub_if_data *sdata = sta->sdata;
277 lockdep_assert_held(&sta->ampdu_mlme.mtx);
280 * While we're asking the driver about the aggregation,
281 * stop the AC queue so that we don't have to worry
282 * about frames that came in while we were doing that,
283 * which would require us to put them to the AC pending
284 * afterwards which just makes the code more complex.
286 ieee80211_stop_queue_agg(local, tid);
288 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
291 * make sure no packets are being processed to get
292 * valid starting sequence number
296 start_seq_num = sta->tid_seq[tid] >> 4;
298 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
299 &sta->sta, tid, &start_seq_num);
301 #ifdef CONFIG_MAC80211_HT_DEBUG
302 printk(KERN_DEBUG "BA request denied - HW unavailable for"
305 spin_lock_bh(&sta->lock);
306 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
307 spin_unlock_bh(&sta->lock);
309 ieee80211_wake_queue_agg(local, tid);
310 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
314 /* we can take packets again now */
315 ieee80211_wake_queue_agg(local, tid);
317 /* activate the timer for the recipient's addBA response */
318 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
319 #ifdef CONFIG_MAC80211_HT_DEBUG
320 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
323 spin_lock_bh(&sta->lock);
324 sta->ampdu_mlme.addba_req_num[tid]++;
325 spin_unlock_bh(&sta->lock);
327 /* send AddBA request */
328 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
329 tid_tx->dialog_token, start_seq_num,
333 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
335 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
336 struct ieee80211_sub_if_data *sdata = sta->sdata;
337 struct ieee80211_local *local = sdata->local;
338 struct tid_ampdu_tx *tid_tx;
341 trace_api_start_tx_ba_session(pubsta, tid);
343 if (WARN_ON(!local->ops->ampdu_action))
346 if ((tid >= STA_TID_NUM) ||
347 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
350 #ifdef CONFIG_MAC80211_HT_DEBUG
351 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
353 #endif /* CONFIG_MAC80211_HT_DEBUG */
356 * The aggregation code is not prepared to handle
357 * anything but STA/AP due to the BSSID handling.
358 * IBSS could work in the code but isn't supported
359 * by drivers or the standard.
361 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
362 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
363 sdata->vif.type != NL80211_IFTYPE_AP)
366 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
367 #ifdef CONFIG_MAC80211_HT_DEBUG
368 printk(KERN_DEBUG "BA sessions blocked. "
369 "Denying BA session request\n");
374 spin_lock_bh(&sta->lock);
376 /* we have tried too many times, receiver does not want A-MPDU */
377 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
382 tid_tx = sta->ampdu_mlme.tid_tx[tid];
383 /* check if the TID is not in aggregation flow already */
385 #ifdef CONFIG_MAC80211_HT_DEBUG
386 printk(KERN_DEBUG "BA request denied - session is not "
387 "idle on tid %u\n", tid);
388 #endif /* CONFIG_MAC80211_HT_DEBUG */
393 /* prepare A-MPDU MLME for Tx aggregation */
394 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
396 #ifdef CONFIG_MAC80211_HT_DEBUG
398 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
405 skb_queue_head_init(&tid_tx->pending);
406 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
409 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
410 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
411 init_timer(&tid_tx->addba_resp_timer);
413 /* assign a dialog token */
414 sta->ampdu_mlme.dialog_token_allocator++;
415 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
417 /* finally, assign it to the array */
418 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
420 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
422 /* this flow continues off the work */
424 spin_unlock_bh(&sta->lock);
427 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
430 * splice packets from the STA's pending to the local pending,
431 * requires a call to ieee80211_agg_splice_finish later
433 static void __acquires(agg_queue)
434 ieee80211_agg_splice_packets(struct ieee80211_local *local,
435 struct tid_ampdu_tx *tid_tx, u16 tid)
437 int queue = ieee80211_ac_from_tid(tid);
440 ieee80211_stop_queue_agg(local, tid);
442 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
443 " from the pending queue\n", tid))
446 if (!skb_queue_empty(&tid_tx->pending)) {
447 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
448 /* copy over remaining packets */
449 skb_queue_splice_tail_init(&tid_tx->pending,
450 &local->pending[queue]);
451 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
455 static void __releases(agg_queue)
456 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
458 ieee80211_wake_queue_agg(local, tid);
461 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
462 struct sta_info *sta, u16 tid)
464 lockdep_assert_held(&sta->ampdu_mlme.mtx);
466 #ifdef CONFIG_MAC80211_HT_DEBUG
467 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
470 drv_ampdu_action(local, sta->sdata,
471 IEEE80211_AMPDU_TX_OPERATIONAL,
472 &sta->sta, tid, NULL);
475 * synchronize with TX path, while splicing the TX path
476 * should block so it won't put more packets onto pending.
478 spin_lock_bh(&sta->lock);
480 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
482 * Now mark as operational. This will be visible
483 * in the TX path, and lets it go lock-free in
486 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
487 ieee80211_agg_splice_finish(local, tid);
489 spin_unlock_bh(&sta->lock);
492 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
494 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 struct tid_ampdu_tx *tid_tx;
499 trace_api_start_tx_ba_cb(sdata, ra, tid);
501 if (tid >= STA_TID_NUM) {
502 #ifdef CONFIG_MAC80211_HT_DEBUG
503 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
509 mutex_lock(&local->sta_mtx);
510 sta = sta_info_get(sdata, ra);
512 mutex_unlock(&local->sta_mtx);
513 #ifdef CONFIG_MAC80211_HT_DEBUG
514 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
519 mutex_lock(&sta->ampdu_mlme.mtx);
520 tid_tx = sta->ampdu_mlme.tid_tx[tid];
522 if (WARN_ON(!tid_tx)) {
523 #ifdef CONFIG_MAC80211_HT_DEBUG
524 printk(KERN_DEBUG "addBA was not requested!\n");
529 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
532 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
533 ieee80211_agg_tx_operational(local, sta, tid);
536 mutex_unlock(&sta->ampdu_mlme.mtx);
537 mutex_unlock(&local->sta_mtx);
540 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
541 const u8 *ra, u16 tid)
543 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
544 struct ieee80211_local *local = sdata->local;
545 struct ieee80211_ra_tid *ra_tid;
546 struct sk_buff *skb = dev_alloc_skb(0);
548 if (unlikely(!skb)) {
549 #ifdef CONFIG_MAC80211_HT_DEBUG
551 printk(KERN_WARNING "%s: Not enough memory, "
552 "dropping start BA session", sdata->name);
556 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
557 memcpy(&ra_tid->ra, ra, ETH_ALEN);
560 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
561 skb_queue_tail(&sdata->skb_queue, skb);
562 ieee80211_queue_work(&local->hw, &sdata->work);
564 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
566 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
567 enum ieee80211_back_parties initiator)
571 mutex_lock(&sta->ampdu_mlme.mtx);
573 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
575 mutex_unlock(&sta->ampdu_mlme.mtx);
580 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
582 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
583 struct ieee80211_sub_if_data *sdata = sta->sdata;
584 struct ieee80211_local *local = sdata->local;
585 struct tid_ampdu_tx *tid_tx;
588 trace_api_stop_tx_ba_session(pubsta, tid);
590 if (!local->ops->ampdu_action)
593 if (tid >= STA_TID_NUM)
596 spin_lock_bh(&sta->lock);
597 tid_tx = sta->ampdu_mlme.tid_tx[tid];
604 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
605 /* already in progress stopping it */
610 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
611 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
614 spin_unlock_bh(&sta->lock);
617 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
619 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
621 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
622 struct ieee80211_local *local = sdata->local;
623 struct sta_info *sta;
624 struct tid_ampdu_tx *tid_tx;
626 trace_api_stop_tx_ba_cb(sdata, ra, tid);
628 if (tid >= STA_TID_NUM) {
629 #ifdef CONFIG_MAC80211_HT_DEBUG
630 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
636 #ifdef CONFIG_MAC80211_HT_DEBUG
637 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
639 #endif /* CONFIG_MAC80211_HT_DEBUG */
641 mutex_lock(&local->sta_mtx);
643 sta = sta_info_get(sdata, ra);
645 #ifdef CONFIG_MAC80211_HT_DEBUG
646 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
651 mutex_lock(&sta->ampdu_mlme.mtx);
652 spin_lock_bh(&sta->lock);
653 tid_tx = sta->ampdu_mlme.tid_tx[tid];
655 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
656 #ifdef CONFIG_MAC80211_HT_DEBUG
657 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
662 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
663 ieee80211_send_delba(sta->sdata, ra, tid,
664 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
667 * When we get here, the TX path will not be lockless any more wrt.
668 * aggregation, since the OPERATIONAL bit has long been cleared.
669 * Thus it will block on getting the lock, if it occurs. So if we
670 * stop the queue now, we will not get any more packets, and any
671 * that might be being processed will wait for us here, thereby
672 * guaranteeing that no packets go to the tid_tx pending queue any
676 ieee80211_agg_splice_packets(local, tid_tx, tid);
678 /* future packets must not find the tid_tx struct any more */
679 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
681 ieee80211_agg_splice_finish(local, tid);
683 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
686 spin_unlock_bh(&sta->lock);
687 mutex_unlock(&sta->ampdu_mlme.mtx);
689 mutex_unlock(&local->sta_mtx);
692 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
693 const u8 *ra, u16 tid)
695 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
696 struct ieee80211_local *local = sdata->local;
697 struct ieee80211_ra_tid *ra_tid;
698 struct sk_buff *skb = dev_alloc_skb(0);
700 if (unlikely(!skb)) {
701 #ifdef CONFIG_MAC80211_HT_DEBUG
703 printk(KERN_WARNING "%s: Not enough memory, "
704 "dropping stop BA session", sdata->name);
708 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
709 memcpy(&ra_tid->ra, ra, ETH_ALEN);
712 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
713 skb_queue_tail(&sdata->skb_queue, skb);
714 ieee80211_queue_work(&local->hw, &sdata->work);
716 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
719 void ieee80211_process_addba_resp(struct ieee80211_local *local,
720 struct sta_info *sta,
721 struct ieee80211_mgmt *mgmt,
724 struct tid_ampdu_tx *tid_tx;
727 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
728 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
730 mutex_lock(&sta->ampdu_mlme.mtx);
732 tid_tx = sta->ampdu_mlme.tid_tx[tid];
736 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
737 #ifdef CONFIG_MAC80211_HT_DEBUG
738 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
743 del_timer(&tid_tx->addba_resp_timer);
745 #ifdef CONFIG_MAC80211_HT_DEBUG
746 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
749 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
750 == WLAN_STATUS_SUCCESS) {
751 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
753 /* ignore duplicate response */
757 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
758 ieee80211_agg_tx_operational(local, sta, tid);
760 sta->ampdu_mlme.addba_req_num[tid] = 0;
762 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
766 mutex_unlock(&sta->ampdu_mlme.mtx);