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 <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "driver-ops.h"
25 * Aggregation on the TX side requires setting the hardware flag
26 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
27 * hardware parameter to the number of hardware AMPDU queues. If there are no
28 * hardware queues then the driver will (currently) have to do all frame
31 * When TX aggregation is started by some subsystem (usually the rate control
32 * algorithm would be appropriate) by calling the
33 * ieee80211_start_tx_ba_session() function, the driver will be notified via
34 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
36 * In response to that, the driver is later required to call the
37 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
38 * function, which will start the aggregation session.
40 * Similarly, when the aggregation session is stopped by
41 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
42 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
43 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
44 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
47 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
48 const u8 *da, u16 tid,
49 u8 dialog_token, u16 start_seq_num,
50 u16 agg_size, u16 timeout)
52 struct ieee80211_local *local = sdata->local;
54 struct ieee80211_mgmt *mgmt;
57 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
60 printk(KERN_ERR "%s: failed to allocate buffer "
61 "for addba request frame\n", sdata->dev->name);
64 skb_reserve(skb, local->hw.extra_tx_headroom);
65 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
67 memcpy(mgmt->da, da, ETH_ALEN);
68 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
69 if (sdata->vif.type == NL80211_IFTYPE_AP ||
70 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
71 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
72 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
73 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_ACTION);
78 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
80 mgmt->u.action.category = WLAN_CATEGORY_BACK;
81 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
83 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
84 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
85 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
86 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
88 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
90 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
91 mgmt->u.action.u.addba_req.start_seq_num =
92 cpu_to_le16(start_seq_num << 4);
94 ieee80211_tx_skb(sdata, skb, 1);
97 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
99 struct ieee80211_local *local = sdata->local;
101 struct ieee80211_bar *bar;
104 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
106 printk(KERN_ERR "%s: failed to allocate buffer for "
107 "bar frame\n", sdata->dev->name);
110 skb_reserve(skb, local->hw.extra_tx_headroom);
111 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
112 memset(bar, 0, sizeof(*bar));
113 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
114 IEEE80211_STYPE_BACK_REQ);
115 memcpy(bar->ra, ra, ETH_ALEN);
116 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
117 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
118 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
119 bar_control |= (u16)(tid << 12);
120 bar->control = cpu_to_le16(bar_control);
121 bar->start_seq_num = cpu_to_le16(ssn);
123 ieee80211_tx_skb(sdata, skb, 0);
126 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
127 enum ieee80211_back_parties initiator)
129 struct ieee80211_local *local = sta->local;
133 #ifdef CONFIG_MAC80211_HT_DEBUG
134 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
136 #endif /* CONFIG_MAC80211_HT_DEBUG */
138 state = &sta->ampdu_mlme.tid_state_tx[tid];
140 if (*state == HT_AGG_STATE_OPERATIONAL)
141 sta->ampdu_mlme.addba_req_num[tid] = 0;
143 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
144 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
146 ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_STOP,
147 &sta->sta, tid, NULL);
149 /* HW shall not deny going back to legacy */
152 * We may have pending packets get stuck in this case...
153 * Not bothering with a workaround for now.
161 * After sending add Block Ack request we activated a timer until
162 * add Block Ack response will arrive from the recipient.
163 * If this timer expires sta_addba_resp_timer_expired will be executed.
165 static void sta_addba_resp_timer_expired(unsigned long data)
167 /* not an elegant detour, but there is no choice as the timer passes
168 * only one argument, and both sta_info and TID are needed, so init
169 * flow in sta_info_create gives the TID as data, while the timer_to_id
170 * array gives the sta through container_of */
171 u16 tid = *(u8 *)data;
172 struct sta_info *sta = container_of((void *)data,
173 struct sta_info, timer_to_tid[tid]);
176 state = &sta->ampdu_mlme.tid_state_tx[tid];
178 /* check if the TID waits for addBA response */
179 spin_lock_bh(&sta->lock);
180 if ((*state & (HT_ADDBA_REQUESTED_MSK | HT_ADDBA_RECEIVED_MSK |
181 HT_AGG_STATE_REQ_STOP_BA_MSK)) !=
182 HT_ADDBA_REQUESTED_MSK) {
183 spin_unlock_bh(&sta->lock);
184 *state = HT_AGG_STATE_IDLE;
185 #ifdef CONFIG_MAC80211_HT_DEBUG
186 printk(KERN_DEBUG "timer expired on tid %d but we are not "
187 "(or no longer) expecting addBA response there",
193 #ifdef CONFIG_MAC80211_HT_DEBUG
194 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
197 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
198 spin_unlock_bh(&sta->lock);
201 static inline int ieee80211_ac_from_tid(int tid)
203 return ieee802_1d_to_ac[tid & 7];
206 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
208 struct ieee80211_local *local = hw_to_local(hw);
209 struct sta_info *sta;
210 struct ieee80211_sub_if_data *sdata;
215 if (WARN_ON(!local->ops->ampdu_action))
218 if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
221 #ifdef CONFIG_MAC80211_HT_DEBUG
222 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
224 #endif /* CONFIG_MAC80211_HT_DEBUG */
228 sta = sta_info_get(local, ra);
230 #ifdef CONFIG_MAC80211_HT_DEBUG
231 printk(KERN_DEBUG "Could not find the station\n");
238 * The aggregation code is not prepared to handle
239 * anything but STA/AP due to the BSSID handling.
240 * IBSS could work in the code but isn't supported
241 * by drivers or the standard.
243 if (sta->sdata->vif.type != NL80211_IFTYPE_STATION &&
244 sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
245 sta->sdata->vif.type != NL80211_IFTYPE_AP) {
250 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
251 #ifdef CONFIG_MAC80211_HT_DEBUG
252 printk(KERN_DEBUG "Suspend in progress. "
253 "Denying BA session request\n");
259 spin_lock_bh(&sta->lock);
260 spin_lock(&local->ampdu_lock);
264 /* we have tried too many times, receiver does not want A-MPDU */
265 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
270 state = &sta->ampdu_mlme.tid_state_tx[tid];
271 /* check if the TID is not in aggregation flow already */
272 if (*state != HT_AGG_STATE_IDLE) {
273 #ifdef CONFIG_MAC80211_HT_DEBUG
274 printk(KERN_DEBUG "BA request denied - session is not "
275 "idle on tid %u\n", tid);
276 #endif /* CONFIG_MAC80211_HT_DEBUG */
282 * While we're asking the driver about the aggregation,
283 * stop the AC queue so that we don't have to worry
284 * about frames that came in while we were doing that,
285 * which would require us to put them to the AC pending
286 * afterwards which just makes the code more complex.
288 ieee80211_stop_queue_by_reason(
289 &local->hw, ieee80211_ac_from_tid(tid),
290 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
292 /* prepare A-MPDU MLME for Tx aggregation */
293 sta->ampdu_mlme.tid_tx[tid] =
294 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
295 if (!sta->ampdu_mlme.tid_tx[tid]) {
296 #ifdef CONFIG_MAC80211_HT_DEBUG
298 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
305 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending);
308 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
309 sta_addba_resp_timer_expired;
310 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
311 (unsigned long)&sta->timer_to_tid[tid];
312 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
314 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
315 * call back right away, it must see that the flow has begun */
316 *state |= HT_ADDBA_REQUESTED_MSK;
318 start_seq_num = sta->tid_seq[tid];
320 ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_START,
321 &sta->sta, tid, &start_seq_num);
324 #ifdef CONFIG_MAC80211_HT_DEBUG
325 printk(KERN_DEBUG "BA request denied - HW unavailable for"
327 #endif /* CONFIG_MAC80211_HT_DEBUG */
328 *state = HT_AGG_STATE_IDLE;
332 /* Driver vetoed or OKed, but we can take packets again now */
333 ieee80211_wake_queue_by_reason(
334 &local->hw, ieee80211_ac_from_tid(tid),
335 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
337 spin_unlock(&local->ampdu_lock);
338 spin_unlock_bh(&sta->lock);
340 /* send an addBA request */
341 sta->ampdu_mlme.dialog_token_allocator++;
342 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
343 sta->ampdu_mlme.dialog_token_allocator;
344 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
346 ieee80211_send_addba_request(sta->sdata, ra, tid,
347 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
348 sta->ampdu_mlme.tid_tx[tid]->ssn,
350 sta->ampdu_mlme.addba_req_num[tid]++;
351 /* activate the timer for the recipient's addBA response */
352 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
353 jiffies + ADDBA_RESP_INTERVAL;
354 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
355 #ifdef CONFIG_MAC80211_HT_DEBUG
356 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
361 kfree(sta->ampdu_mlme.tid_tx[tid]);
362 sta->ampdu_mlme.tid_tx[tid] = NULL;
364 ieee80211_wake_queue_by_reason(
365 &local->hw, ieee80211_ac_from_tid(tid),
366 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
368 spin_unlock(&local->ampdu_lock);
369 spin_unlock_bh(&sta->lock);
374 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
377 * splice packets from the STA's pending to the local pending,
378 * requires a call to ieee80211_agg_splice_finish and holding
379 * local->ampdu_lock across both calls.
381 static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
382 struct sta_info *sta, u16 tid)
385 u16 queue = ieee80211_ac_from_tid(tid);
387 ieee80211_stop_queue_by_reason(
389 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
391 if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK))
394 if (WARN(!sta->ampdu_mlme.tid_tx[tid],
395 "TID %d gone but expected when splicing aggregates from"
396 "the pending queue\n", tid))
399 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) {
400 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
401 /* copy over remaining packets */
402 skb_queue_splice_tail_init(
403 &sta->ampdu_mlme.tid_tx[tid]->pending,
404 &local->pending[queue]);
405 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
409 static void ieee80211_agg_splice_finish(struct ieee80211_local *local,
410 struct sta_info *sta, u16 tid)
412 u16 queue = ieee80211_ac_from_tid(tid);
414 ieee80211_wake_queue_by_reason(
416 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
419 /* caller must hold sta->lock */
420 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
421 struct sta_info *sta, u16 tid)
423 #ifdef CONFIG_MAC80211_HT_DEBUG
424 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
427 spin_lock(&local->ampdu_lock);
428 ieee80211_agg_splice_packets(local, sta, tid);
430 * NB: we rely on sta->lock being taken in the TX
431 * processing here when adding to the pending queue,
432 * otherwise we could only change the state of the
433 * session to OPERATIONAL _here_.
435 ieee80211_agg_splice_finish(local, sta, tid);
436 spin_unlock(&local->ampdu_lock);
438 drv_ampdu_action(local, IEEE80211_AMPDU_TX_OPERATIONAL,
439 &sta->sta, tid, NULL);
442 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
444 struct ieee80211_local *local = hw_to_local(hw);
445 struct sta_info *sta;
448 if (tid >= STA_TID_NUM) {
449 #ifdef CONFIG_MAC80211_HT_DEBUG
450 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
457 sta = sta_info_get(local, ra);
460 #ifdef CONFIG_MAC80211_HT_DEBUG
461 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
466 state = &sta->ampdu_mlme.tid_state_tx[tid];
467 spin_lock_bh(&sta->lock);
469 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) {
470 #ifdef CONFIG_MAC80211_HT_DEBUG
471 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
474 spin_unlock_bh(&sta->lock);
479 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK))
482 *state |= HT_ADDBA_DRV_READY_MSK;
484 if (*state == HT_AGG_STATE_OPERATIONAL)
485 ieee80211_agg_tx_operational(local, sta, tid);
488 spin_unlock_bh(&sta->lock);
491 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
493 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
494 const u8 *ra, u16 tid)
496 struct ieee80211_local *local = hw_to_local(hw);
497 struct ieee80211_ra_tid *ra_tid;
498 struct sk_buff *skb = dev_alloc_skb(0);
500 if (unlikely(!skb)) {
501 #ifdef CONFIG_MAC80211_HT_DEBUG
503 printk(KERN_WARNING "%s: Not enough memory, "
504 "dropping start BA session", skb->dev->name);
508 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
509 memcpy(&ra_tid->ra, ra, ETH_ALEN);
512 skb->pkt_type = IEEE80211_ADDBA_MSG;
513 skb_queue_tail(&local->skb_queue, skb);
514 tasklet_schedule(&local->tasklet);
516 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
518 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
519 enum ieee80211_back_parties initiator)
524 /* check if the TID is in aggregation */
525 state = &sta->ampdu_mlme.tid_state_tx[tid];
526 spin_lock_bh(&sta->lock);
528 if (*state != HT_AGG_STATE_OPERATIONAL) {
533 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
536 spin_unlock_bh(&sta->lock);
540 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
542 enum ieee80211_back_parties initiator)
544 struct ieee80211_local *local = hw_to_local(hw);
545 struct sta_info *sta;
548 if (!local->ops->ampdu_action)
551 if (tid >= STA_TID_NUM)
555 sta = sta_info_get(local, ra);
561 ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator);
565 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
567 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
569 struct ieee80211_local *local = hw_to_local(hw);
570 struct sta_info *sta;
573 if (tid >= STA_TID_NUM) {
574 #ifdef CONFIG_MAC80211_HT_DEBUG
575 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
584 #endif /* CONFIG_MAC80211_HT_DEBUG */
587 sta = sta_info_get(local, ra);
589 #ifdef CONFIG_MAC80211_HT_DEBUG
590 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
595 state = &sta->ampdu_mlme.tid_state_tx[tid];
597 /* NOTE: no need to use sta->lock in this state check, as
598 * ieee80211_stop_tx_ba_session will let only one stop call to
599 * pass through per sta/tid
601 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
602 #ifdef CONFIG_MAC80211_HT_DEBUG
603 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
609 if (*state & HT_AGG_STATE_INITIATOR_MSK)
610 ieee80211_send_delba(sta->sdata, ra, tid,
611 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
613 spin_lock_bh(&sta->lock);
614 spin_lock(&local->ampdu_lock);
616 ieee80211_agg_splice_packets(local, sta, tid);
618 *state = HT_AGG_STATE_IDLE;
619 /* from now on packets are no longer put onto sta->pending */
620 kfree(sta->ampdu_mlme.tid_tx[tid]);
621 sta->ampdu_mlme.tid_tx[tid] = NULL;
623 ieee80211_agg_splice_finish(local, sta, tid);
625 spin_unlock(&local->ampdu_lock);
626 spin_unlock_bh(&sta->lock);
630 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
632 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
633 const u8 *ra, u16 tid)
635 struct ieee80211_local *local = hw_to_local(hw);
636 struct ieee80211_ra_tid *ra_tid;
637 struct sk_buff *skb = dev_alloc_skb(0);
639 if (unlikely(!skb)) {
640 #ifdef CONFIG_MAC80211_HT_DEBUG
642 printk(KERN_WARNING "%s: Not enough memory, "
643 "dropping stop BA session", skb->dev->name);
647 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
648 memcpy(&ra_tid->ra, ra, ETH_ALEN);
651 skb->pkt_type = IEEE80211_DELBA_MSG;
652 skb_queue_tail(&local->skb_queue, skb);
653 tasklet_schedule(&local->tasklet);
655 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
658 void ieee80211_process_addba_resp(struct ieee80211_local *local,
659 struct sta_info *sta,
660 struct ieee80211_mgmt *mgmt,
666 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
667 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
669 state = &sta->ampdu_mlme.tid_state_tx[tid];
671 spin_lock_bh(&sta->lock);
673 if (!(*state & HT_ADDBA_REQUESTED_MSK))
676 if (mgmt->u.action.u.addba_resp.dialog_token !=
677 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
678 #ifdef CONFIG_MAC80211_HT_DEBUG
679 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
680 #endif /* CONFIG_MAC80211_HT_DEBUG */
684 del_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
686 #ifdef CONFIG_MAC80211_HT_DEBUG
687 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
688 #endif /* CONFIG_MAC80211_HT_DEBUG */
690 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
691 == WLAN_STATUS_SUCCESS) {
692 u8 curstate = *state;
694 *state |= HT_ADDBA_RECEIVED_MSK;
696 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL)
697 ieee80211_agg_tx_operational(local, sta, tid);
699 sta->ampdu_mlme.addba_req_num[tid] = 0;
701 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
705 spin_unlock_bh(&sta->lock);