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 static void kfree_tid_tx(struct rcu_head *rcu_head)
141 struct tid_ampdu_tx *tid_tx =
142 container_of(rcu_head, struct tid_ampdu_tx, rcu_head);
147 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
148 enum ieee80211_back_parties initiator,
151 struct ieee80211_local *local = sta->local;
152 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
155 lockdep_assert_held(&sta->ampdu_mlme.mtx);
160 spin_lock_bh(&sta->lock);
162 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
163 /* not even started yet! */
164 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
165 spin_unlock_bh(&sta->lock);
166 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
170 spin_unlock_bh(&sta->lock);
172 #ifdef CONFIG_MAC80211_HT_DEBUG
173 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
175 #endif /* CONFIG_MAC80211_HT_DEBUG */
177 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
179 del_timer_sync(&tid_tx->addba_resp_timer);
182 * After this packets are no longer handed right through
183 * to the driver but are put onto tid_tx->pending instead,
184 * with locking to ensure proper access.
186 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
188 tid_tx->stop_initiator = initiator;
189 tid_tx->tx_stop = tx;
191 ret = drv_ampdu_action(local, sta->sdata,
192 IEEE80211_AMPDU_TX_STOP,
193 &sta->sta, tid, NULL);
195 /* HW shall not deny going back to legacy */
198 * We may have pending packets get stuck in this case...
199 * Not bothering with a workaround for now.
207 * After sending add Block Ack request we activated a timer until
208 * add Block Ack response will arrive from the recipient.
209 * If this timer expires sta_addba_resp_timer_expired will be executed.
211 static void sta_addba_resp_timer_expired(unsigned long data)
213 /* not an elegant detour, but there is no choice as the timer passes
214 * only one argument, and both sta_info and TID are needed, so init
215 * flow in sta_info_create gives the TID as data, while the timer_to_id
216 * array gives the sta through container_of */
217 u16 tid = *(u8 *)data;
218 struct sta_info *sta = container_of((void *)data,
219 struct sta_info, timer_to_tid[tid]);
220 struct tid_ampdu_tx *tid_tx;
222 /* check if the TID waits for addBA response */
224 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
226 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
228 #ifdef CONFIG_MAC80211_HT_DEBUG
229 printk(KERN_DEBUG "timer expired on tid %d but we are not "
230 "(or no longer) expecting addBA response there\n",
236 #ifdef CONFIG_MAC80211_HT_DEBUG
237 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
240 ieee80211_stop_tx_ba_session(&sta->sta, tid);
244 static inline int ieee80211_ac_from_tid(int tid)
246 return ieee802_1d_to_ac[tid & 7];
250 * When multiple aggregation sessions on multiple stations
251 * are being created/destroyed simultaneously, we need to
252 * refcount the global queue stop caused by that in order
253 * to not get into a situation where one of the aggregation
254 * setup or teardown re-enables queues before the other is
255 * ready to handle that.
257 * These two functions take care of this issue by keeping
258 * a global "agg_queue_stop" refcount.
260 static void __acquires(agg_queue)
261 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
263 int queue = ieee80211_ac_from_tid(tid);
265 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
266 ieee80211_stop_queue_by_reason(
268 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
269 __acquire(agg_queue);
272 static void __releases(agg_queue)
273 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
275 int queue = ieee80211_ac_from_tid(tid);
277 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
278 ieee80211_wake_queue_by_reason(
280 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
281 __release(agg_queue);
284 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
286 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
287 struct ieee80211_local *local = sta->local;
288 struct ieee80211_sub_if_data *sdata = sta->sdata;
292 lockdep_assert_held(&sta->ampdu_mlme.mtx);
295 * While we're asking the driver about the aggregation,
296 * stop the AC queue so that we don't have to worry
297 * about frames that came in while we were doing that,
298 * which would require us to put them to the AC pending
299 * afterwards which just makes the code more complex.
301 ieee80211_stop_queue_agg(local, tid);
303 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
306 * make sure no packets are being processed to get
307 * valid starting sequence number
311 start_seq_num = sta->tid_seq[tid] >> 4;
313 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
314 &sta->sta, tid, &start_seq_num);
316 #ifdef CONFIG_MAC80211_HT_DEBUG
317 printk(KERN_DEBUG "BA request denied - HW unavailable for"
320 spin_lock_bh(&sta->lock);
321 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
322 spin_unlock_bh(&sta->lock);
324 ieee80211_wake_queue_agg(local, tid);
325 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
329 /* we can take packets again now */
330 ieee80211_wake_queue_agg(local, tid);
332 /* activate the timer for the recipient's addBA response */
333 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
334 #ifdef CONFIG_MAC80211_HT_DEBUG
335 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
338 spin_lock_bh(&sta->lock);
339 sta->ampdu_mlme.addba_req_num[tid]++;
340 spin_unlock_bh(&sta->lock);
342 /* send AddBA request */
343 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
344 tid_tx->dialog_token, start_seq_num,
348 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
350 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
351 struct ieee80211_sub_if_data *sdata = sta->sdata;
352 struct ieee80211_local *local = sdata->local;
353 struct tid_ampdu_tx *tid_tx;
356 trace_api_start_tx_ba_session(pubsta, tid);
358 if (WARN_ON(!local->ops->ampdu_action))
361 if ((tid >= STA_TID_NUM) ||
362 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
365 #ifdef CONFIG_MAC80211_HT_DEBUG
366 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
368 #endif /* CONFIG_MAC80211_HT_DEBUG */
371 * The aggregation code is not prepared to handle
372 * anything but STA/AP due to the BSSID handling.
373 * IBSS could work in the code but isn't supported
374 * by drivers or the standard.
376 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
377 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
378 sdata->vif.type != NL80211_IFTYPE_AP)
381 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
382 #ifdef CONFIG_MAC80211_HT_DEBUG
383 printk(KERN_DEBUG "BA sessions blocked. "
384 "Denying BA session request\n");
389 spin_lock_bh(&sta->lock);
391 /* we have tried too many times, receiver does not want A-MPDU */
392 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
397 tid_tx = sta->ampdu_mlme.tid_tx[tid];
398 /* check if the TID is not in aggregation flow already */
400 #ifdef CONFIG_MAC80211_HT_DEBUG
401 printk(KERN_DEBUG "BA request denied - session is not "
402 "idle on tid %u\n", tid);
403 #endif /* CONFIG_MAC80211_HT_DEBUG */
408 /* prepare A-MPDU MLME for Tx aggregation */
409 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
411 #ifdef CONFIG_MAC80211_HT_DEBUG
413 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
420 skb_queue_head_init(&tid_tx->pending);
421 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
424 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
425 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
426 init_timer(&tid_tx->addba_resp_timer);
428 /* assign a dialog token */
429 sta->ampdu_mlme.dialog_token_allocator++;
430 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
432 /* finally, assign it to the array */
433 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
435 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
437 /* this flow continues off the work */
439 spin_unlock_bh(&sta->lock);
442 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
445 * splice packets from the STA's pending to the local pending,
446 * requires a call to ieee80211_agg_splice_finish later
448 static void __acquires(agg_queue)
449 ieee80211_agg_splice_packets(struct ieee80211_local *local,
450 struct tid_ampdu_tx *tid_tx, u16 tid)
452 int queue = ieee80211_ac_from_tid(tid);
455 ieee80211_stop_queue_agg(local, tid);
457 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
458 " from the pending queue\n", tid))
461 if (!skb_queue_empty(&tid_tx->pending)) {
462 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
463 /* copy over remaining packets */
464 skb_queue_splice_tail_init(&tid_tx->pending,
465 &local->pending[queue]);
466 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
470 static void __releases(agg_queue)
471 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
473 ieee80211_wake_queue_agg(local, tid);
476 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
477 struct sta_info *sta, u16 tid)
479 lockdep_assert_held(&sta->ampdu_mlme.mtx);
481 #ifdef CONFIG_MAC80211_HT_DEBUG
482 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
485 drv_ampdu_action(local, sta->sdata,
486 IEEE80211_AMPDU_TX_OPERATIONAL,
487 &sta->sta, tid, NULL);
490 * synchronize with TX path, while splicing the TX path
491 * should block so it won't put more packets onto pending.
493 spin_lock_bh(&sta->lock);
495 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
497 * Now mark as operational. This will be visible
498 * in the TX path, and lets it go lock-free in
501 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
502 ieee80211_agg_splice_finish(local, tid);
504 spin_unlock_bh(&sta->lock);
507 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
509 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
510 struct ieee80211_local *local = sdata->local;
511 struct sta_info *sta;
512 struct tid_ampdu_tx *tid_tx;
514 trace_api_start_tx_ba_cb(sdata, ra, tid);
516 if (tid >= STA_TID_NUM) {
517 #ifdef CONFIG_MAC80211_HT_DEBUG
518 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
524 mutex_lock(&local->sta_mtx);
525 sta = sta_info_get(sdata, ra);
527 mutex_unlock(&local->sta_mtx);
528 #ifdef CONFIG_MAC80211_HT_DEBUG
529 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
534 mutex_lock(&sta->ampdu_mlme.mtx);
535 tid_tx = sta->ampdu_mlme.tid_tx[tid];
537 if (WARN_ON(!tid_tx)) {
538 #ifdef CONFIG_MAC80211_HT_DEBUG
539 printk(KERN_DEBUG "addBA was not requested!\n");
544 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
547 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
548 ieee80211_agg_tx_operational(local, sta, tid);
551 mutex_unlock(&sta->ampdu_mlme.mtx);
552 mutex_unlock(&local->sta_mtx);
555 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
556 const u8 *ra, u16 tid)
558 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
559 struct ieee80211_local *local = sdata->local;
560 struct ieee80211_ra_tid *ra_tid;
561 struct sk_buff *skb = dev_alloc_skb(0);
563 if (unlikely(!skb)) {
564 #ifdef CONFIG_MAC80211_HT_DEBUG
566 printk(KERN_WARNING "%s: Not enough memory, "
567 "dropping start BA session", sdata->name);
571 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
572 memcpy(&ra_tid->ra, ra, ETH_ALEN);
575 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
576 skb_queue_tail(&sdata->skb_queue, skb);
577 ieee80211_queue_work(&local->hw, &sdata->work);
579 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
581 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
582 enum ieee80211_back_parties initiator,
587 mutex_lock(&sta->ampdu_mlme.mtx);
589 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx);
591 mutex_unlock(&sta->ampdu_mlme.mtx);
596 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
598 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
599 struct ieee80211_sub_if_data *sdata = sta->sdata;
600 struct ieee80211_local *local = sdata->local;
601 struct tid_ampdu_tx *tid_tx;
604 trace_api_stop_tx_ba_session(pubsta, tid);
606 if (!local->ops->ampdu_action)
609 if (tid >= STA_TID_NUM)
612 spin_lock_bh(&sta->lock);
613 tid_tx = sta->ampdu_mlme.tid_tx[tid];
620 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
621 /* already in progress stopping it */
626 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
627 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
630 spin_unlock_bh(&sta->lock);
633 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
635 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
637 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
638 struct ieee80211_local *local = sdata->local;
639 struct sta_info *sta;
640 struct tid_ampdu_tx *tid_tx;
642 trace_api_stop_tx_ba_cb(sdata, ra, tid);
644 if (tid >= STA_TID_NUM) {
645 #ifdef CONFIG_MAC80211_HT_DEBUG
646 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
652 #ifdef CONFIG_MAC80211_HT_DEBUG
653 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
655 #endif /* CONFIG_MAC80211_HT_DEBUG */
657 mutex_lock(&local->sta_mtx);
659 sta = sta_info_get(sdata, ra);
661 #ifdef CONFIG_MAC80211_HT_DEBUG
662 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
667 mutex_lock(&sta->ampdu_mlme.mtx);
668 spin_lock_bh(&sta->lock);
669 tid_tx = sta->ampdu_mlme.tid_tx[tid];
671 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
672 #ifdef CONFIG_MAC80211_HT_DEBUG
673 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
678 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
679 ieee80211_send_delba(sta->sdata, ra, tid,
680 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
683 * When we get here, the TX path will not be lockless any more wrt.
684 * aggregation, since the OPERATIONAL bit has long been cleared.
685 * Thus it will block on getting the lock, if it occurs. So if we
686 * stop the queue now, we will not get any more packets, and any
687 * that might be being processed will wait for us here, thereby
688 * guaranteeing that no packets go to the tid_tx pending queue any
692 ieee80211_agg_splice_packets(local, tid_tx, tid);
694 /* future packets must not find the tid_tx struct any more */
695 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
697 ieee80211_agg_splice_finish(local, tid);
699 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
702 spin_unlock_bh(&sta->lock);
703 mutex_unlock(&sta->ampdu_mlme.mtx);
705 mutex_unlock(&local->sta_mtx);
708 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
709 const u8 *ra, u16 tid)
711 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
712 struct ieee80211_local *local = sdata->local;
713 struct ieee80211_ra_tid *ra_tid;
714 struct sk_buff *skb = dev_alloc_skb(0);
716 if (unlikely(!skb)) {
717 #ifdef CONFIG_MAC80211_HT_DEBUG
719 printk(KERN_WARNING "%s: Not enough memory, "
720 "dropping stop BA session", sdata->name);
724 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
725 memcpy(&ra_tid->ra, ra, ETH_ALEN);
728 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
729 skb_queue_tail(&sdata->skb_queue, skb);
730 ieee80211_queue_work(&local->hw, &sdata->work);
732 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
735 void ieee80211_process_addba_resp(struct ieee80211_local *local,
736 struct sta_info *sta,
737 struct ieee80211_mgmt *mgmt,
740 struct tid_ampdu_tx *tid_tx;
743 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
744 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
746 mutex_lock(&sta->ampdu_mlme.mtx);
748 tid_tx = sta->ampdu_mlme.tid_tx[tid];
752 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
753 #ifdef CONFIG_MAC80211_HT_DEBUG
754 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
759 del_timer(&tid_tx->addba_resp_timer);
761 #ifdef CONFIG_MAC80211_HT_DEBUG
762 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
765 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
766 == WLAN_STATUS_SUCCESS) {
767 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
769 /* ignore duplicate response */
773 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
774 ieee80211_agg_tx_operational(local, sta, tid);
776 sta->ampdu_mlme.addba_req_num[tid] = 0;
778 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR,
783 mutex_unlock(&sta->ampdu_mlme.mtx);