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"
24 * DOC: TX A-MPDU aggregation
26 * Aggregation on the TX side requires setting the hardware flag
27 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
28 * packets with a flag indicating A-MPDU aggregation. The driver
29 * or device is responsible for actually aggregating the frames,
30 * as well as deciding how many and which to aggregate.
32 * When TX aggregation is started by some subsystem (usually the rate
33 * control algorithm would be appropriate) by calling the
34 * ieee80211_start_tx_ba_session() function, the driver will be
35 * notified via its @ampdu_action function, with the
36 * %IEEE80211_AMPDU_TX_START action.
38 * In response to that, the driver is later required to call the
39 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
40 * start the aggregation session after the peer has also responded.
41 * If the peer responds negatively, the session will be stopped
42 * again right away. Note that it is possible for the aggregation
43 * session to be stopped before the driver has indicated that it
44 * is done setting it up, in which case it must not indicate the
47 * Also note that, since we also need to wait for a response from
48 * the peer, the driver is notified of the completion of the
49 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
50 * @ampdu_action callback.
52 * Similarly, when the aggregation session is stopped by the peer
53 * or something calling ieee80211_stop_tx_ba_session(), the driver's
54 * @ampdu_action function will be called with the action
55 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
56 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
59 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
60 const u8 *da, u16 tid,
61 u8 dialog_token, u16 start_seq_num,
62 u16 agg_size, u16 timeout)
64 struct ieee80211_local *local = sdata->local;
66 struct ieee80211_mgmt *mgmt;
69 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
72 printk(KERN_ERR "%s: failed to allocate buffer "
73 "for addba request frame\n", sdata->name);
76 skb_reserve(skb, local->hw.extra_tx_headroom);
77 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
79 memcpy(mgmt->da, da, ETH_ALEN);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 if (sdata->vif.type == NL80211_IFTYPE_AP ||
82 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
83 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
84 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
85 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
87 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
88 IEEE80211_STYPE_ACTION);
90 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
92 mgmt->u.action.category = WLAN_CATEGORY_BACK;
93 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
95 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
96 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
97 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
98 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
100 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
102 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
103 mgmt->u.action.u.addba_req.start_seq_num =
104 cpu_to_le16(start_seq_num << 4);
106 ieee80211_tx_skb(sdata, skb);
109 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
111 struct ieee80211_local *local = sdata->local;
113 struct ieee80211_bar *bar;
116 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
118 printk(KERN_ERR "%s: failed to allocate buffer for "
119 "bar frame\n", sdata->name);
122 skb_reserve(skb, local->hw.extra_tx_headroom);
123 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
124 memset(bar, 0, sizeof(*bar));
125 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
126 IEEE80211_STYPE_BACK_REQ);
127 memcpy(bar->ra, ra, ETH_ALEN);
128 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
129 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
130 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
131 bar_control |= (u16)(tid << 12);
132 bar->control = cpu_to_le16(bar_control);
133 bar->start_seq_num = cpu_to_le16(ssn);
135 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
136 ieee80211_tx_skb(sdata, skb);
139 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
140 enum ieee80211_back_parties initiator,
143 struct ieee80211_local *local = sta->local;
144 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
147 lockdep_assert_held(&sta->ampdu_mlme.mtx);
152 spin_lock_bh(&sta->lock);
154 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
155 /* not even started yet! */
156 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
157 spin_unlock_bh(&sta->lock);
158 kfree_rcu(tid_tx, rcu_head);
162 spin_unlock_bh(&sta->lock);
164 #ifdef CONFIG_MAC80211_HT_DEBUG
165 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
167 #endif /* CONFIG_MAC80211_HT_DEBUG */
169 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
171 del_timer_sync(&tid_tx->addba_resp_timer);
174 * After this packets are no longer handed right through
175 * to the driver but are put onto tid_tx->pending instead,
176 * with locking to ensure proper access.
178 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
180 tid_tx->stop_initiator = initiator;
181 tid_tx->tx_stop = tx;
183 ret = drv_ampdu_action(local, sta->sdata,
184 IEEE80211_AMPDU_TX_STOP,
185 &sta->sta, tid, NULL, 0);
187 /* HW shall not deny going back to legacy */
190 * We may have pending packets get stuck in this case...
191 * Not bothering with a workaround for now.
199 * After sending add Block Ack request we activated a timer until
200 * add Block Ack response will arrive from the recipient.
201 * If this timer expires sta_addba_resp_timer_expired will be executed.
203 static void sta_addba_resp_timer_expired(unsigned long data)
205 /* not an elegant detour, but there is no choice as the timer passes
206 * only one argument, and both sta_info and TID are needed, so init
207 * flow in sta_info_create gives the TID as data, while the timer_to_id
208 * array gives the sta through container_of */
209 u16 tid = *(u8 *)data;
210 struct sta_info *sta = container_of((void *)data,
211 struct sta_info, timer_to_tid[tid]);
212 struct tid_ampdu_tx *tid_tx;
214 /* check if the TID waits for addBA response */
216 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
218 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
220 #ifdef CONFIG_MAC80211_HT_DEBUG
221 printk(KERN_DEBUG "timer expired on tid %d but we are not "
222 "(or no longer) expecting addBA response there\n",
228 #ifdef CONFIG_MAC80211_HT_DEBUG
229 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
232 ieee80211_stop_tx_ba_session(&sta->sta, tid);
236 static inline int ieee80211_ac_from_tid(int tid)
238 return ieee802_1d_to_ac[tid & 7];
242 * When multiple aggregation sessions on multiple stations
243 * are being created/destroyed simultaneously, we need to
244 * refcount the global queue stop caused by that in order
245 * to not get into a situation where one of the aggregation
246 * setup or teardown re-enables queues before the other is
247 * ready to handle that.
249 * These two functions take care of this issue by keeping
250 * a global "agg_queue_stop" refcount.
252 static void __acquires(agg_queue)
253 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
255 int queue = ieee80211_ac_from_tid(tid);
257 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
258 ieee80211_stop_queue_by_reason(
260 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
261 __acquire(agg_queue);
264 static void __releases(agg_queue)
265 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
267 int queue = ieee80211_ac_from_tid(tid);
269 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
270 ieee80211_wake_queue_by_reason(
272 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
273 __release(agg_queue);
276 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
278 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
279 struct ieee80211_local *local = sta->local;
280 struct ieee80211_sub_if_data *sdata = sta->sdata;
284 lockdep_assert_held(&sta->ampdu_mlme.mtx);
287 * While we're asking the driver about the aggregation,
288 * stop the AC queue so that we don't have to worry
289 * about frames that came in while we were doing that,
290 * which would require us to put them to the AC pending
291 * afterwards which just makes the code more complex.
293 ieee80211_stop_queue_agg(local, tid);
295 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
298 * make sure no packets are being processed to get
299 * valid starting sequence number
303 start_seq_num = sta->tid_seq[tid] >> 4;
305 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
306 &sta->sta, tid, &start_seq_num, 0);
308 #ifdef CONFIG_MAC80211_HT_DEBUG
309 printk(KERN_DEBUG "BA request denied - HW unavailable for"
312 spin_lock_bh(&sta->lock);
313 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
314 spin_unlock_bh(&sta->lock);
316 ieee80211_wake_queue_agg(local, tid);
317 kfree_rcu(tid_tx, rcu_head);
321 /* we can take packets again now */
322 ieee80211_wake_queue_agg(local, tid);
324 /* activate the timer for the recipient's addBA response */
325 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
326 #ifdef CONFIG_MAC80211_HT_DEBUG
327 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
330 spin_lock_bh(&sta->lock);
331 sta->ampdu_mlme.addba_req_num[tid]++;
332 spin_unlock_bh(&sta->lock);
334 /* send AddBA request */
335 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
336 tid_tx->dialog_token, start_seq_num,
337 local->hw.max_tx_aggregation_subframes,
341 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
344 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
345 struct ieee80211_sub_if_data *sdata = sta->sdata;
346 struct ieee80211_local *local = sdata->local;
347 struct tid_ampdu_tx *tid_tx;
350 trace_api_start_tx_ba_session(pubsta, tid);
352 if (WARN_ON(!local->ops->ampdu_action))
355 if ((tid >= STA_TID_NUM) ||
356 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
359 #ifdef CONFIG_MAC80211_HT_DEBUG
360 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
362 #endif /* CONFIG_MAC80211_HT_DEBUG */
365 * The aggregation code is not prepared to handle
366 * anything but STA/AP due to the BSSID handling.
367 * IBSS could work in the code but isn't supported
368 * by drivers or the standard.
370 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
371 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
372 sdata->vif.type != NL80211_IFTYPE_AP)
375 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
376 #ifdef CONFIG_MAC80211_HT_DEBUG
377 printk(KERN_DEBUG "BA sessions blocked. "
378 "Denying BA session request\n");
383 spin_lock_bh(&sta->lock);
385 /* we have tried too many times, receiver does not want A-MPDU */
386 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
391 tid_tx = sta->ampdu_mlme.tid_tx[tid];
392 /* check if the TID is not in aggregation flow already */
394 #ifdef CONFIG_MAC80211_HT_DEBUG
395 printk(KERN_DEBUG "BA request denied - session is not "
396 "idle on tid %u\n", tid);
397 #endif /* CONFIG_MAC80211_HT_DEBUG */
402 /* prepare A-MPDU MLME for Tx aggregation */
403 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
405 #ifdef CONFIG_MAC80211_HT_DEBUG
407 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
414 skb_queue_head_init(&tid_tx->pending);
415 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
417 tid_tx->timeout = timeout;
420 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
421 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
422 init_timer(&tid_tx->addba_resp_timer);
424 /* assign a dialog token */
425 sta->ampdu_mlme.dialog_token_allocator++;
426 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
428 /* finally, assign it to the array */
429 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
431 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
433 /* this flow continues off the work */
435 spin_unlock_bh(&sta->lock);
438 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
441 * splice packets from the STA's pending to the local pending,
442 * requires a call to ieee80211_agg_splice_finish later
444 static void __acquires(agg_queue)
445 ieee80211_agg_splice_packets(struct ieee80211_local *local,
446 struct tid_ampdu_tx *tid_tx, u16 tid)
448 int queue = ieee80211_ac_from_tid(tid);
451 ieee80211_stop_queue_agg(local, tid);
453 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
454 " from the pending queue\n", tid))
457 if (!skb_queue_empty(&tid_tx->pending)) {
458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459 /* copy over remaining packets */
460 skb_queue_splice_tail_init(&tid_tx->pending,
461 &local->pending[queue]);
462 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
466 static void __releases(agg_queue)
467 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
469 ieee80211_wake_queue_agg(local, tid);
472 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
473 struct sta_info *sta, u16 tid)
475 lockdep_assert_held(&sta->ampdu_mlme.mtx);
477 #ifdef CONFIG_MAC80211_HT_DEBUG
478 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
481 drv_ampdu_action(local, sta->sdata,
482 IEEE80211_AMPDU_TX_OPERATIONAL,
483 &sta->sta, tid, NULL,
484 sta->ampdu_mlme.tid_tx[tid]->buf_size);
487 * synchronize with TX path, while splicing the TX path
488 * should block so it won't put more packets onto pending.
490 spin_lock_bh(&sta->lock);
492 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
494 * Now mark as operational. This will be visible
495 * in the TX path, and lets it go lock-free in
498 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
499 ieee80211_agg_splice_finish(local, tid);
501 spin_unlock_bh(&sta->lock);
504 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
506 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
507 struct ieee80211_local *local = sdata->local;
508 struct sta_info *sta;
509 struct tid_ampdu_tx *tid_tx;
511 trace_api_start_tx_ba_cb(sdata, ra, tid);
513 if (tid >= STA_TID_NUM) {
514 #ifdef CONFIG_MAC80211_HT_DEBUG
515 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
521 mutex_lock(&local->sta_mtx);
522 sta = sta_info_get(sdata, ra);
524 mutex_unlock(&local->sta_mtx);
525 #ifdef CONFIG_MAC80211_HT_DEBUG
526 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
531 mutex_lock(&sta->ampdu_mlme.mtx);
532 tid_tx = sta->ampdu_mlme.tid_tx[tid];
534 if (WARN_ON(!tid_tx)) {
535 #ifdef CONFIG_MAC80211_HT_DEBUG
536 printk(KERN_DEBUG "addBA was not requested!\n");
541 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
544 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
545 ieee80211_agg_tx_operational(local, sta, tid);
548 mutex_unlock(&sta->ampdu_mlme.mtx);
549 mutex_unlock(&local->sta_mtx);
552 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
553 const u8 *ra, u16 tid)
555 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
556 struct ieee80211_local *local = sdata->local;
557 struct ieee80211_ra_tid *ra_tid;
558 struct sk_buff *skb = dev_alloc_skb(0);
560 if (unlikely(!skb)) {
561 #ifdef CONFIG_MAC80211_HT_DEBUG
563 printk(KERN_WARNING "%s: Not enough memory, "
564 "dropping start BA session", sdata->name);
568 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
569 memcpy(&ra_tid->ra, ra, ETH_ALEN);
572 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
573 skb_queue_tail(&sdata->skb_queue, skb);
574 ieee80211_queue_work(&local->hw, &sdata->work);
576 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
578 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
579 enum ieee80211_back_parties initiator,
584 mutex_lock(&sta->ampdu_mlme.mtx);
586 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx);
588 mutex_unlock(&sta->ampdu_mlme.mtx);
593 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
595 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
596 struct ieee80211_sub_if_data *sdata = sta->sdata;
597 struct ieee80211_local *local = sdata->local;
598 struct tid_ampdu_tx *tid_tx;
601 trace_api_stop_tx_ba_session(pubsta, tid);
603 if (!local->ops->ampdu_action)
606 if (tid >= STA_TID_NUM)
609 spin_lock_bh(&sta->lock);
610 tid_tx = sta->ampdu_mlme.tid_tx[tid];
617 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
618 /* already in progress stopping it */
623 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
624 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
627 spin_unlock_bh(&sta->lock);
630 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
632 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
634 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
635 struct ieee80211_local *local = sdata->local;
636 struct sta_info *sta;
637 struct tid_ampdu_tx *tid_tx;
639 trace_api_stop_tx_ba_cb(sdata, ra, tid);
641 if (tid >= STA_TID_NUM) {
642 #ifdef CONFIG_MAC80211_HT_DEBUG
643 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
649 #ifdef CONFIG_MAC80211_HT_DEBUG
650 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
652 #endif /* CONFIG_MAC80211_HT_DEBUG */
654 mutex_lock(&local->sta_mtx);
656 sta = sta_info_get(sdata, ra);
658 #ifdef CONFIG_MAC80211_HT_DEBUG
659 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
664 mutex_lock(&sta->ampdu_mlme.mtx);
665 spin_lock_bh(&sta->lock);
666 tid_tx = sta->ampdu_mlme.tid_tx[tid];
668 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
669 #ifdef CONFIG_MAC80211_HT_DEBUG
670 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
675 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
676 ieee80211_send_delba(sta->sdata, ra, tid,
677 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
680 * When we get here, the TX path will not be lockless any more wrt.
681 * aggregation, since the OPERATIONAL bit has long been cleared.
682 * Thus it will block on getting the lock, if it occurs. So if we
683 * stop the queue now, we will not get any more packets, and any
684 * that might be being processed will wait for us here, thereby
685 * guaranteeing that no packets go to the tid_tx pending queue any
689 ieee80211_agg_splice_packets(local, tid_tx, tid);
691 /* future packets must not find the tid_tx struct any more */
692 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
694 ieee80211_agg_splice_finish(local, tid);
696 kfree_rcu(tid_tx, rcu_head);
699 spin_unlock_bh(&sta->lock);
700 mutex_unlock(&sta->ampdu_mlme.mtx);
702 mutex_unlock(&local->sta_mtx);
705 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
706 const u8 *ra, u16 tid)
708 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
709 struct ieee80211_local *local = sdata->local;
710 struct ieee80211_ra_tid *ra_tid;
711 struct sk_buff *skb = dev_alloc_skb(0);
713 if (unlikely(!skb)) {
714 #ifdef CONFIG_MAC80211_HT_DEBUG
716 printk(KERN_WARNING "%s: Not enough memory, "
717 "dropping stop BA session", sdata->name);
721 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
722 memcpy(&ra_tid->ra, ra, ETH_ALEN);
725 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
726 skb_queue_tail(&sdata->skb_queue, skb);
727 ieee80211_queue_work(&local->hw, &sdata->work);
729 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
732 void ieee80211_process_addba_resp(struct ieee80211_local *local,
733 struct sta_info *sta,
734 struct ieee80211_mgmt *mgmt,
737 struct tid_ampdu_tx *tid_tx;
741 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
742 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
743 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
745 mutex_lock(&sta->ampdu_mlme.mtx);
747 tid_tx = sta->ampdu_mlme.tid_tx[tid];
751 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
752 #ifdef CONFIG_MAC80211_HT_DEBUG
753 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
758 del_timer(&tid_tx->addba_resp_timer);
760 #ifdef CONFIG_MAC80211_HT_DEBUG
761 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
764 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
765 == WLAN_STATUS_SUCCESS) {
767 * IEEE 802.11-2007 7.3.1.14:
768 * In an ADDBA Response frame, when the Status Code field
769 * is set to 0, the Buffer Size subfield is set to a value
775 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
777 /* ignore duplicate response */
781 tid_tx->buf_size = buf_size;
783 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
784 ieee80211_agg_tx_operational(local, sta, tid);
786 sta->ampdu_mlme.addba_req_num[tid] = 0;
788 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR,
793 mutex_unlock(&sta->ampdu_mlme.mtx);