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 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
140 struct tid_ampdu_tx *tid_tx)
142 lockdep_assert_held(&sta->ampdu_mlme.mtx);
143 lockdep_assert_held(&sta->lock);
144 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
147 static void kfree_tid_tx(struct rcu_head *rcu_head)
149 struct tid_ampdu_tx *tid_tx =
150 container_of(rcu_head, struct tid_ampdu_tx, rcu_head);
155 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
156 enum ieee80211_back_parties initiator,
159 struct ieee80211_local *local = sta->local;
160 struct tid_ampdu_tx *tid_tx;
163 lockdep_assert_held(&sta->ampdu_mlme.mtx);
165 spin_lock_bh(&sta->lock);
167 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
169 spin_unlock_bh(&sta->lock);
173 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
174 /* not even started yet! */
175 ieee80211_assign_tid_tx(sta, tid, NULL);
176 spin_unlock_bh(&sta->lock);
177 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
181 spin_unlock_bh(&sta->lock);
183 #ifdef CONFIG_MAC80211_HT_DEBUG
184 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
186 #endif /* CONFIG_MAC80211_HT_DEBUG */
188 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
190 del_timer_sync(&tid_tx->addba_resp_timer);
193 * After this packets are no longer handed right through
194 * to the driver but are put onto tid_tx->pending instead,
195 * with locking to ensure proper access.
197 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
199 tid_tx->stop_initiator = initiator;
200 tid_tx->tx_stop = tx;
202 ret = drv_ampdu_action(local, sta->sdata,
203 IEEE80211_AMPDU_TX_STOP,
204 &sta->sta, tid, NULL, 0);
206 /* HW shall not deny going back to legacy */
209 * We may have pending packets get stuck in this case...
210 * Not bothering with a workaround for now.
218 * After sending add Block Ack request we activated a timer until
219 * add Block Ack response will arrive from the recipient.
220 * If this timer expires sta_addba_resp_timer_expired will be executed.
222 static void sta_addba_resp_timer_expired(unsigned long data)
224 /* not an elegant detour, but there is no choice as the timer passes
225 * only one argument, and both sta_info and TID are needed, so init
226 * flow in sta_info_create gives the TID as data, while the timer_to_id
227 * array gives the sta through container_of */
228 u16 tid = *(u8 *)data;
229 struct sta_info *sta = container_of((void *)data,
230 struct sta_info, timer_to_tid[tid]);
231 struct tid_ampdu_tx *tid_tx;
233 /* check if the TID waits for addBA response */
235 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
237 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
239 #ifdef CONFIG_MAC80211_HT_DEBUG
240 printk(KERN_DEBUG "timer expired on tid %d but we are not "
241 "(or no longer) expecting addBA response there\n",
247 #ifdef CONFIG_MAC80211_HT_DEBUG
248 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
251 ieee80211_stop_tx_ba_session(&sta->sta, tid);
255 static inline int ieee80211_ac_from_tid(int tid)
257 return ieee802_1d_to_ac[tid & 7];
261 * When multiple aggregation sessions on multiple stations
262 * are being created/destroyed simultaneously, we need to
263 * refcount the global queue stop caused by that in order
264 * to not get into a situation where one of the aggregation
265 * setup or teardown re-enables queues before the other is
266 * ready to handle that.
268 * These two functions take care of this issue by keeping
269 * a global "agg_queue_stop" refcount.
271 static void __acquires(agg_queue)
272 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
274 int queue = ieee80211_ac_from_tid(tid);
276 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
277 ieee80211_stop_queue_by_reason(
279 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
280 __acquire(agg_queue);
283 static void __releases(agg_queue)
284 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
286 int queue = ieee80211_ac_from_tid(tid);
288 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
289 ieee80211_wake_queue_by_reason(
291 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
292 __release(agg_queue);
295 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
297 struct tid_ampdu_tx *tid_tx;
298 struct ieee80211_local *local = sta->local;
299 struct ieee80211_sub_if_data *sdata = sta->sdata;
303 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
306 * While we're asking the driver about the aggregation,
307 * stop the AC queue so that we don't have to worry
308 * about frames that came in while we were doing that,
309 * which would require us to put them to the AC pending
310 * afterwards which just makes the code more complex.
312 ieee80211_stop_queue_agg(local, tid);
314 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
317 * make sure no packets are being processed to get
318 * valid starting sequence number
322 start_seq_num = sta->tid_seq[tid] >> 4;
324 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
325 &sta->sta, tid, &start_seq_num, 0);
327 #ifdef CONFIG_MAC80211_HT_DEBUG
328 printk(KERN_DEBUG "BA request denied - HW unavailable for"
331 spin_lock_bh(&sta->lock);
332 ieee80211_assign_tid_tx(sta, tid, NULL);
333 spin_unlock_bh(&sta->lock);
335 ieee80211_wake_queue_agg(local, tid);
336 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
340 /* we can take packets again now */
341 ieee80211_wake_queue_agg(local, tid);
343 /* activate the timer for the recipient's addBA response */
344 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
345 #ifdef CONFIG_MAC80211_HT_DEBUG
346 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
349 spin_lock_bh(&sta->lock);
350 sta->ampdu_mlme.addba_req_num[tid]++;
351 spin_unlock_bh(&sta->lock);
353 /* send AddBA request */
354 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
355 tid_tx->dialog_token, start_seq_num,
356 local->hw.max_tx_aggregation_subframes,
360 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
363 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
364 struct ieee80211_sub_if_data *sdata = sta->sdata;
365 struct ieee80211_local *local = sdata->local;
366 struct tid_ampdu_tx *tid_tx;
369 trace_api_start_tx_ba_session(pubsta, tid);
371 if (WARN_ON(!local->ops->ampdu_action))
374 if ((tid >= STA_TID_NUM) ||
375 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
378 #ifdef CONFIG_MAC80211_HT_DEBUG
379 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
381 #endif /* CONFIG_MAC80211_HT_DEBUG */
384 * The aggregation code is not prepared to handle
385 * anything but STA/AP due to the BSSID handling.
386 * IBSS could work in the code but isn't supported
387 * by drivers or the standard.
389 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
390 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
391 sdata->vif.type != NL80211_IFTYPE_AP)
394 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
395 #ifdef CONFIG_MAC80211_HT_DEBUG
396 printk(KERN_DEBUG "BA sessions blocked. "
397 "Denying BA session request\n");
402 spin_lock_bh(&sta->lock);
404 /* we have tried too many times, receiver does not want A-MPDU */
405 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
410 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
411 /* check if the TID is not in aggregation flow already */
412 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
413 #ifdef CONFIG_MAC80211_HT_DEBUG
414 printk(KERN_DEBUG "BA request denied - session is not "
415 "idle on tid %u\n", tid);
416 #endif /* CONFIG_MAC80211_HT_DEBUG */
421 /* prepare A-MPDU MLME for Tx aggregation */
422 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
424 #ifdef CONFIG_MAC80211_HT_DEBUG
426 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
433 skb_queue_head_init(&tid_tx->pending);
434 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
436 tid_tx->timeout = timeout;
439 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
440 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
441 init_timer(&tid_tx->addba_resp_timer);
443 /* assign a dialog token */
444 sta->ampdu_mlme.dialog_token_allocator++;
445 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
448 * Finally, assign it to the start array; the work item will
449 * collect it and move it to the normal array.
451 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
453 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
455 /* this flow continues off the work */
457 spin_unlock_bh(&sta->lock);
460 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
463 * splice packets from the STA's pending to the local pending,
464 * requires a call to ieee80211_agg_splice_finish later
466 static void __acquires(agg_queue)
467 ieee80211_agg_splice_packets(struct ieee80211_local *local,
468 struct tid_ampdu_tx *tid_tx, u16 tid)
470 int queue = ieee80211_ac_from_tid(tid);
473 ieee80211_stop_queue_agg(local, tid);
475 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
476 " from the pending queue\n", tid))
479 if (!skb_queue_empty(&tid_tx->pending)) {
480 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
481 /* copy over remaining packets */
482 skb_queue_splice_tail_init(&tid_tx->pending,
483 &local->pending[queue]);
484 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
488 static void __releases(agg_queue)
489 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
491 ieee80211_wake_queue_agg(local, tid);
494 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
495 struct sta_info *sta, u16 tid)
497 struct tid_ampdu_tx *tid_tx;
499 lockdep_assert_held(&sta->ampdu_mlme.mtx);
501 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
503 #ifdef CONFIG_MAC80211_HT_DEBUG
504 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
507 drv_ampdu_action(local, sta->sdata,
508 IEEE80211_AMPDU_TX_OPERATIONAL,
509 &sta->sta, tid, NULL, tid_tx->buf_size);
512 * synchronize with TX path, while splicing the TX path
513 * should block so it won't put more packets onto pending.
515 spin_lock_bh(&sta->lock);
517 ieee80211_agg_splice_packets(local, tid_tx, tid);
519 * Now mark as operational. This will be visible
520 * in the TX path, and lets it go lock-free in
523 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
524 ieee80211_agg_splice_finish(local, tid);
526 spin_unlock_bh(&sta->lock);
529 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
531 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
532 struct ieee80211_local *local = sdata->local;
533 struct sta_info *sta;
534 struct tid_ampdu_tx *tid_tx;
536 trace_api_start_tx_ba_cb(sdata, ra, tid);
538 if (tid >= STA_TID_NUM) {
539 #ifdef CONFIG_MAC80211_HT_DEBUG
540 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
546 mutex_lock(&local->sta_mtx);
547 sta = sta_info_get(sdata, ra);
549 mutex_unlock(&local->sta_mtx);
550 #ifdef CONFIG_MAC80211_HT_DEBUG
551 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
556 mutex_lock(&sta->ampdu_mlme.mtx);
557 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
559 if (WARN_ON(!tid_tx)) {
560 #ifdef CONFIG_MAC80211_HT_DEBUG
561 printk(KERN_DEBUG "addBA was not requested!\n");
566 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
569 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
570 ieee80211_agg_tx_operational(local, sta, tid);
573 mutex_unlock(&sta->ampdu_mlme.mtx);
574 mutex_unlock(&local->sta_mtx);
577 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
578 const u8 *ra, u16 tid)
580 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
581 struct ieee80211_local *local = sdata->local;
582 struct ieee80211_ra_tid *ra_tid;
583 struct sk_buff *skb = dev_alloc_skb(0);
585 if (unlikely(!skb)) {
586 #ifdef CONFIG_MAC80211_HT_DEBUG
588 printk(KERN_WARNING "%s: Not enough memory, "
589 "dropping start BA session", sdata->name);
593 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
594 memcpy(&ra_tid->ra, ra, ETH_ALEN);
597 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
598 skb_queue_tail(&sdata->skb_queue, skb);
599 ieee80211_queue_work(&local->hw, &sdata->work);
601 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
603 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
604 enum ieee80211_back_parties initiator,
609 mutex_lock(&sta->ampdu_mlme.mtx);
611 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx);
613 mutex_unlock(&sta->ampdu_mlme.mtx);
618 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
620 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
621 struct ieee80211_sub_if_data *sdata = sta->sdata;
622 struct ieee80211_local *local = sdata->local;
623 struct tid_ampdu_tx *tid_tx;
626 trace_api_stop_tx_ba_session(pubsta, tid);
628 if (!local->ops->ampdu_action)
631 if (tid >= STA_TID_NUM)
634 spin_lock_bh(&sta->lock);
635 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
642 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
643 /* already in progress stopping it */
648 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
649 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
652 spin_unlock_bh(&sta->lock);
655 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
657 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
659 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
660 struct ieee80211_local *local = sdata->local;
661 struct sta_info *sta;
662 struct tid_ampdu_tx *tid_tx;
664 trace_api_stop_tx_ba_cb(sdata, ra, tid);
666 if (tid >= STA_TID_NUM) {
667 #ifdef CONFIG_MAC80211_HT_DEBUG
668 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
674 #ifdef CONFIG_MAC80211_HT_DEBUG
675 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
677 #endif /* CONFIG_MAC80211_HT_DEBUG */
679 mutex_lock(&local->sta_mtx);
681 sta = sta_info_get(sdata, ra);
683 #ifdef CONFIG_MAC80211_HT_DEBUG
684 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
689 mutex_lock(&sta->ampdu_mlme.mtx);
690 spin_lock_bh(&sta->lock);
691 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
693 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
694 #ifdef CONFIG_MAC80211_HT_DEBUG
695 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
700 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
701 ieee80211_send_delba(sta->sdata, ra, tid,
702 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
705 * When we get here, the TX path will not be lockless any more wrt.
706 * aggregation, since the OPERATIONAL bit has long been cleared.
707 * Thus it will block on getting the lock, if it occurs. So if we
708 * stop the queue now, we will not get any more packets, and any
709 * that might be being processed will wait for us here, thereby
710 * guaranteeing that no packets go to the tid_tx pending queue any
714 ieee80211_agg_splice_packets(local, tid_tx, tid);
716 /* future packets must not find the tid_tx struct any more */
717 ieee80211_assign_tid_tx(sta, tid, NULL);
719 ieee80211_agg_splice_finish(local, tid);
721 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
724 spin_unlock_bh(&sta->lock);
725 mutex_unlock(&sta->ampdu_mlme.mtx);
727 mutex_unlock(&local->sta_mtx);
730 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
731 const u8 *ra, u16 tid)
733 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
734 struct ieee80211_local *local = sdata->local;
735 struct ieee80211_ra_tid *ra_tid;
736 struct sk_buff *skb = dev_alloc_skb(0);
738 if (unlikely(!skb)) {
739 #ifdef CONFIG_MAC80211_HT_DEBUG
741 printk(KERN_WARNING "%s: Not enough memory, "
742 "dropping stop BA session", sdata->name);
746 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
747 memcpy(&ra_tid->ra, ra, ETH_ALEN);
750 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
751 skb_queue_tail(&sdata->skb_queue, skb);
752 ieee80211_queue_work(&local->hw, &sdata->work);
754 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
757 void ieee80211_process_addba_resp(struct ieee80211_local *local,
758 struct sta_info *sta,
759 struct ieee80211_mgmt *mgmt,
762 struct tid_ampdu_tx *tid_tx;
766 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
767 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
768 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
770 mutex_lock(&sta->ampdu_mlme.mtx);
772 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
776 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
777 #ifdef CONFIG_MAC80211_HT_DEBUG
778 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
783 del_timer(&tid_tx->addba_resp_timer);
785 #ifdef CONFIG_MAC80211_HT_DEBUG
786 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
789 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
790 == WLAN_STATUS_SUCCESS) {
792 * IEEE 802.11-2007 7.3.1.14:
793 * In an ADDBA Response frame, when the Status Code field
794 * is set to 0, the Buffer Size subfield is set to a value
800 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
802 /* ignore duplicate response */
806 tid_tx->buf_size = buf_size;
808 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
809 ieee80211_agg_tx_operational(local, sta, tid);
811 sta->ampdu_mlme.addba_req_num[tid] = 0;
813 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR,
818 mutex_unlock(&sta->ampdu_mlme.mtx);