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 <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 static int ___ieee80211_stop_tx_ba_session(
137 struct sta_info *sta, u16 tid,
138 enum ieee80211_back_parties initiator)
140 struct ieee80211_local *local = sta->local;
141 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
144 lockdep_assert_held(&sta->lock);
146 if (WARN_ON(!tid_tx))
149 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
150 /* not even started yet! */
151 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
152 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
156 #ifdef CONFIG_MAC80211_HT_DEBUG
157 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
159 #endif /* CONFIG_MAC80211_HT_DEBUG */
161 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
164 * After this packets are no longer handed right through
165 * to the driver but are put onto tid_tx->pending instead,
166 * with locking to ensure proper access.
168 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
170 tid_tx->stop_initiator = initiator;
172 ret = drv_ampdu_action(local, sta->sdata,
173 IEEE80211_AMPDU_TX_STOP,
174 &sta->sta, tid, NULL);
176 /* HW shall not deny going back to legacy */
179 * We may have pending packets get stuck in this case...
180 * Not bothering with a workaround for now.
188 * After sending add Block Ack request we activated a timer until
189 * add Block Ack response will arrive from the recipient.
190 * If this timer expires sta_addba_resp_timer_expired will be executed.
192 static void sta_addba_resp_timer_expired(unsigned long data)
194 /* not an elegant detour, but there is no choice as the timer passes
195 * only one argument, and both sta_info and TID are needed, so init
196 * flow in sta_info_create gives the TID as data, while the timer_to_id
197 * array gives the sta through container_of */
198 u16 tid = *(u8 *)data;
199 struct sta_info *sta = container_of((void *)data,
200 struct sta_info, timer_to_tid[tid]);
201 struct tid_ampdu_tx *tid_tx;
203 /* check if the TID waits for addBA response */
204 spin_lock_bh(&sta->lock);
205 tid_tx = sta->ampdu_mlme.tid_tx[tid];
207 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
208 spin_unlock_bh(&sta->lock);
209 #ifdef CONFIG_MAC80211_HT_DEBUG
210 printk(KERN_DEBUG "timer expired on tid %d but we are not "
211 "(or no longer) expecting addBA response there\n",
217 #ifdef CONFIG_MAC80211_HT_DEBUG
218 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
221 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
222 spin_unlock_bh(&sta->lock);
225 static inline int ieee80211_ac_from_tid(int tid)
227 return ieee802_1d_to_ac[tid & 7];
231 * When multiple aggregation sessions on multiple stations
232 * are being created/destroyed simultaneously, we need to
233 * refcount the global queue stop caused by that in order
234 * to not get into a situation where one of the aggregation
235 * setup or teardown re-enables queues before the other is
236 * ready to handle that.
238 * These two functions take care of this issue by keeping
239 * a global "agg_queue_stop" refcount.
241 static void __acquires(agg_queue)
242 ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
244 int queue = ieee80211_ac_from_tid(tid);
246 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
247 ieee80211_stop_queue_by_reason(
249 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
250 __acquire(agg_queue);
253 static void __releases(agg_queue)
254 ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
256 int queue = ieee80211_ac_from_tid(tid);
258 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
259 ieee80211_wake_queue_by_reason(
261 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
262 __release(agg_queue);
265 static void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
267 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
268 struct ieee80211_local *local = sta->local;
269 struct ieee80211_sub_if_data *sdata = sta->sdata;
274 * While we're asking the driver about the aggregation,
275 * stop the AC queue so that we don't have to worry
276 * about frames that came in while we were doing that,
277 * which would require us to put them to the AC pending
278 * afterwards which just makes the code more complex.
280 ieee80211_stop_queue_agg(local, tid);
282 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
285 * This might be off by one due to a race that we can't
286 * really prevent here without synchronize_net() which
287 * can't be called now.
289 start_seq_num = sta->tid_seq[tid] >> 4;
291 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
292 &sta->sta, tid, &start_seq_num);
294 #ifdef CONFIG_MAC80211_HT_DEBUG
295 printk(KERN_DEBUG "BA request denied - HW unavailable for"
298 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
299 ieee80211_wake_queue_agg(local, tid);
300 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
304 /* we can take packets again now */
305 ieee80211_wake_queue_agg(local, tid);
307 /* activate the timer for the recipient's addBA response */
308 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
309 #ifdef CONFIG_MAC80211_HT_DEBUG
310 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
313 sta->ampdu_mlme.addba_req_num[tid]++;
315 /* send AddBA request */
316 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
317 tid_tx->dialog_token, start_seq_num,
321 void ieee80211_tx_ba_session_work(struct work_struct *work)
323 struct sta_info *sta =
324 container_of(work, struct sta_info, ampdu_mlme.work);
325 struct tid_ampdu_tx *tid_tx;
329 * When this flag is set, new sessions should be
330 * blocked, and existing sessions will be torn
331 * down by the code that set the flag, so this
334 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
337 spin_lock_bh(&sta->lock);
338 for (tid = 0; tid < STA_TID_NUM; tid++) {
339 tid_tx = sta->ampdu_mlme.tid_tx[tid];
343 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
344 ieee80211_tx_ba_session_handle_start(sta, tid);
345 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
347 ___ieee80211_stop_tx_ba_session(sta, tid,
348 WLAN_BACK_INITIATOR);
350 spin_unlock_bh(&sta->lock);
353 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
355 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
356 struct ieee80211_sub_if_data *sdata = sta->sdata;
357 struct ieee80211_local *local = sdata->local;
358 struct tid_ampdu_tx *tid_tx;
361 trace_api_start_tx_ba_session(pubsta, tid);
363 if (WARN_ON(!local->ops->ampdu_action))
366 if ((tid >= STA_TID_NUM) ||
367 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
370 #ifdef CONFIG_MAC80211_HT_DEBUG
371 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
373 #endif /* CONFIG_MAC80211_HT_DEBUG */
376 * The aggregation code is not prepared to handle
377 * anything but STA/AP due to the BSSID handling.
378 * IBSS could work in the code but isn't supported
379 * by drivers or the standard.
381 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
382 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
383 sdata->vif.type != NL80211_IFTYPE_AP)
386 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
387 #ifdef CONFIG_MAC80211_HT_DEBUG
388 printk(KERN_DEBUG "BA sessions blocked. "
389 "Denying BA session request\n");
394 spin_lock_bh(&sta->lock);
396 /* we have tried too many times, receiver does not want A-MPDU */
397 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
402 tid_tx = sta->ampdu_mlme.tid_tx[tid];
403 /* check if the TID is not in aggregation flow already */
405 #ifdef CONFIG_MAC80211_HT_DEBUG
406 printk(KERN_DEBUG "BA request denied - session is not "
407 "idle on tid %u\n", tid);
408 #endif /* CONFIG_MAC80211_HT_DEBUG */
413 /* prepare A-MPDU MLME for Tx aggregation */
414 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
416 #ifdef CONFIG_MAC80211_HT_DEBUG
418 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
425 skb_queue_head_init(&tid_tx->pending);
426 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
429 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
430 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
431 init_timer(&tid_tx->addba_resp_timer);
433 /* assign a dialog token */
434 sta->ampdu_mlme.dialog_token_allocator++;
435 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
437 /* finally, assign it to the array */
438 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
440 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
442 /* this flow continues off the work */
444 spin_unlock_bh(&sta->lock);
447 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
450 * splice packets from the STA's pending to the local pending,
451 * requires a call to ieee80211_agg_splice_finish later
453 static void __acquires(agg_queue)
454 ieee80211_agg_splice_packets(struct ieee80211_local *local,
455 struct tid_ampdu_tx *tid_tx, u16 tid)
457 int queue = ieee80211_ac_from_tid(tid);
460 ieee80211_stop_queue_agg(local, tid);
462 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
463 " from the pending queue\n", tid))
466 if (!skb_queue_empty(&tid_tx->pending)) {
467 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
468 /* copy over remaining packets */
469 skb_queue_splice_tail_init(&tid_tx->pending,
470 &local->pending[queue]);
471 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
475 static void __releases(agg_queue)
476 ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
478 ieee80211_wake_queue_agg(local, tid);
481 /* caller must hold sta->lock */
482 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
483 struct sta_info *sta, u16 tid)
485 lockdep_assert_held(&sta->lock);
487 #ifdef CONFIG_MAC80211_HT_DEBUG
488 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
491 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
493 * Now mark as operational. This will be visible
494 * in the TX path, and lets it go lock-free in
497 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
498 ieee80211_agg_splice_finish(local, tid);
500 drv_ampdu_action(local, sta->sdata,
501 IEEE80211_AMPDU_TX_OPERATIONAL,
502 &sta->sta, tid, NULL);
505 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
507 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
508 struct ieee80211_local *local = sdata->local;
509 struct sta_info *sta;
510 struct tid_ampdu_tx *tid_tx;
512 trace_api_start_tx_ba_cb(sdata, ra, tid);
514 if (tid >= STA_TID_NUM) {
515 #ifdef CONFIG_MAC80211_HT_DEBUG
516 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
523 sta = sta_info_get(sdata, ra);
526 #ifdef CONFIG_MAC80211_HT_DEBUG
527 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
532 spin_lock_bh(&sta->lock);
533 tid_tx = sta->ampdu_mlme.tid_tx[tid];
535 if (WARN_ON(!tid_tx)) {
536 #ifdef CONFIG_MAC80211_HT_DEBUG
537 printk(KERN_DEBUG "addBA was not requested!\n");
539 spin_unlock_bh(&sta->lock);
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 spin_unlock_bh(&sta->lock);
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)
584 struct tid_ampdu_tx *tid_tx;
587 spin_lock_bh(&sta->lock);
588 tid_tx = sta->ampdu_mlme.tid_tx[tid];
595 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
598 spin_unlock_bh(&sta->lock);
602 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
604 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
605 struct ieee80211_sub_if_data *sdata = sta->sdata;
606 struct ieee80211_local *local = sdata->local;
607 struct tid_ampdu_tx *tid_tx;
610 trace_api_stop_tx_ba_session(pubsta, tid);
612 if (!local->ops->ampdu_action)
615 if (tid >= STA_TID_NUM)
618 spin_lock_bh(&sta->lock);
619 tid_tx = sta->ampdu_mlme.tid_tx[tid];
626 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
627 /* already in progress stopping it */
632 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
633 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
636 spin_unlock_bh(&sta->lock);
639 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
641 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
643 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
644 struct ieee80211_local *local = sdata->local;
645 struct sta_info *sta;
646 struct tid_ampdu_tx *tid_tx;
648 trace_api_stop_tx_ba_cb(sdata, ra, tid);
650 if (tid >= STA_TID_NUM) {
651 #ifdef CONFIG_MAC80211_HT_DEBUG
652 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
658 #ifdef CONFIG_MAC80211_HT_DEBUG
659 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
661 #endif /* CONFIG_MAC80211_HT_DEBUG */
664 sta = sta_info_get(sdata, ra);
666 #ifdef CONFIG_MAC80211_HT_DEBUG
667 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
673 spin_lock_bh(&sta->lock);
674 tid_tx = sta->ampdu_mlme.tid_tx[tid];
676 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
677 #ifdef CONFIG_MAC80211_HT_DEBUG
678 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
680 spin_unlock_bh(&sta->lock);
685 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
686 ieee80211_send_delba(sta->sdata, ra, tid,
687 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
690 * When we get here, the TX path will not be lockless any more wrt.
691 * aggregation, since the OPERATIONAL bit has long been cleared.
692 * Thus it will block on getting the lock, if it occurs. So if we
693 * stop the queue now, we will not get any more packets, and any
694 * that might be being processed will wait for us here, thereby
695 * guaranteeing that no packets go to the tid_tx pending queue any
699 ieee80211_agg_splice_packets(local, tid_tx, tid);
701 /* future packets must not find the tid_tx struct any more */
702 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
704 ieee80211_agg_splice_finish(local, tid);
706 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
708 spin_unlock_bh(&sta->lock);
712 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
713 const u8 *ra, u16 tid)
715 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
716 struct ieee80211_local *local = sdata->local;
717 struct ieee80211_ra_tid *ra_tid;
718 struct sk_buff *skb = dev_alloc_skb(0);
720 if (unlikely(!skb)) {
721 #ifdef CONFIG_MAC80211_HT_DEBUG
723 printk(KERN_WARNING "%s: Not enough memory, "
724 "dropping stop BA session", sdata->name);
728 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
729 memcpy(&ra_tid->ra, ra, ETH_ALEN);
732 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
733 skb_queue_tail(&sdata->skb_queue, skb);
734 ieee80211_queue_work(&local->hw, &sdata->work);
736 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
739 void ieee80211_process_addba_resp(struct ieee80211_local *local,
740 struct sta_info *sta,
741 struct ieee80211_mgmt *mgmt,
744 struct tid_ampdu_tx *tid_tx;
747 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
748 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
750 spin_lock_bh(&sta->lock);
752 tid_tx = sta->ampdu_mlme.tid_tx[tid];
757 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
758 #ifdef CONFIG_MAC80211_HT_DEBUG
759 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
764 del_timer(&tid_tx->addba_resp_timer);
766 #ifdef CONFIG_MAC80211_HT_DEBUG
767 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
770 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
771 == WLAN_STATUS_SUCCESS) {
772 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
774 /* ignore duplicate response */
778 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
779 ieee80211_agg_tx_operational(local, sta, tid);
781 sta->ampdu_mlme.addba_req_num[tid] = 0;
783 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
787 spin_unlock_bh(&sta->lock);