mac80211: fix ampdu_action tx_start ssn
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / agg-tx.c
blob5aa8f4a3ed174907ca8ded2f68e7dd66123d643a
1 /*
2 * HT handling
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"
20 #include "wme.h"
22 /**
23 * DOC: TX aggregation
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
29 * buffering.
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;
53 struct sk_buff *skb;
54 struct ieee80211_mgmt *mgmt;
55 u16 capab;
57 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
59 if (!skb) {
60 printk(KERN_ERR "%s: failed to allocate buffer "
61 "for addba request frame\n", sdata->name);
62 return;
64 skb_reserve(skb, local->hw.extra_tx_headroom);
65 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
66 memset(mgmt, 0, 24);
67 memcpy(mgmt->da, da, ETH_ALEN);
68 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
69 if (sdata->vif.type == NL80211_IFTYPE_AP ||
70 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
71 memcpy(mgmt->bssid, sdata->vif.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);
97 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
99 struct ieee80211_local *local = sdata->local;
100 struct sk_buff *skb;
101 struct ieee80211_bar *bar;
102 u16 bar_control = 0;
104 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
105 if (!skb) {
106 printk(KERN_ERR "%s: failed to allocate buffer for "
107 "bar frame\n", sdata->name);
108 return;
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->vif.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_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
124 ieee80211_tx_skb(sdata, skb);
127 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
128 enum ieee80211_back_parties initiator)
130 struct ieee80211_local *local = sta->local;
131 int ret;
132 u8 *state;
134 #ifdef CONFIG_MAC80211_HT_DEBUG
135 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
136 sta->sta.addr, tid);
137 #endif /* CONFIG_MAC80211_HT_DEBUG */
139 state = &sta->ampdu_mlme.tid_state_tx[tid];
141 if (*state == HT_AGG_STATE_OPERATIONAL)
142 sta->ampdu_mlme.addba_req_num[tid] = 0;
144 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
145 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
147 ret = drv_ampdu_action(local, sta->sdata,
148 IEEE80211_AMPDU_TX_STOP,
149 &sta->sta, tid, NULL);
151 /* HW shall not deny going back to legacy */
152 if (WARN_ON(ret)) {
154 * We may have pending packets get stuck in this case...
155 * Not bothering with a workaround for now.
159 return ret;
163 * After sending add Block Ack request we activated a timer until
164 * add Block Ack response will arrive from the recipient.
165 * If this timer expires sta_addba_resp_timer_expired will be executed.
167 static void sta_addba_resp_timer_expired(unsigned long data)
169 /* not an elegant detour, but there is no choice as the timer passes
170 * only one argument, and both sta_info and TID are needed, so init
171 * flow in sta_info_create gives the TID as data, while the timer_to_id
172 * array gives the sta through container_of */
173 u16 tid = *(u8 *)data;
174 struct sta_info *sta = container_of((void *)data,
175 struct sta_info, timer_to_tid[tid]);
176 u8 *state;
178 state = &sta->ampdu_mlme.tid_state_tx[tid];
180 /* check if the TID waits for addBA response */
181 spin_lock_bh(&sta->lock);
182 if ((*state & (HT_ADDBA_REQUESTED_MSK | HT_ADDBA_RECEIVED_MSK)) !=
183 HT_ADDBA_REQUESTED_MSK) {
184 spin_unlock_bh(&sta->lock);
185 *state = HT_AGG_STATE_IDLE;
186 #ifdef CONFIG_MAC80211_HT_DEBUG
187 printk(KERN_DEBUG "timer expired on tid %d but we are not "
188 "(or no longer) expecting addBA response there",
189 tid);
190 #endif
191 return;
194 #ifdef CONFIG_MAC80211_HT_DEBUG
195 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
196 #endif
198 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
199 spin_unlock_bh(&sta->lock);
202 static inline int ieee80211_ac_from_tid(int tid)
204 return ieee802_1d_to_ac[tid & 7];
207 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
209 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
210 struct ieee80211_sub_if_data *sdata = sta->sdata;
211 struct ieee80211_local *local = sdata->local;
212 u8 *state;
213 int ret = 0;
214 u16 start_seq_num;
216 if (WARN_ON(!local->ops->ampdu_action))
217 return -EINVAL;
219 if ((tid >= STA_TID_NUM) ||
220 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
221 return -EINVAL;
223 #ifdef CONFIG_MAC80211_HT_DEBUG
224 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
225 pubsta->addr, tid);
226 #endif /* CONFIG_MAC80211_HT_DEBUG */
229 * The aggregation code is not prepared to handle
230 * anything but STA/AP due to the BSSID handling.
231 * IBSS could work in the code but isn't supported
232 * by drivers or the standard.
234 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
235 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
236 sdata->vif.type != NL80211_IFTYPE_AP)
237 return -EINVAL;
239 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
240 #ifdef CONFIG_MAC80211_HT_DEBUG
241 printk(KERN_DEBUG "Suspend in progress. "
242 "Denying BA session request\n");
243 #endif
244 return -EINVAL;
247 spin_lock_bh(&sta->lock);
248 spin_lock(&local->ampdu_lock);
250 /* we have tried too many times, receiver does not want A-MPDU */
251 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
252 ret = -EBUSY;
253 goto err_unlock_sta;
256 state = &sta->ampdu_mlme.tid_state_tx[tid];
257 /* check if the TID is not in aggregation flow already */
258 if (*state != HT_AGG_STATE_IDLE) {
259 #ifdef CONFIG_MAC80211_HT_DEBUG
260 printk(KERN_DEBUG "BA request denied - session is not "
261 "idle on tid %u\n", tid);
262 #endif /* CONFIG_MAC80211_HT_DEBUG */
263 ret = -EAGAIN;
264 goto err_unlock_sta;
268 * While we're asking the driver about the aggregation,
269 * stop the AC queue so that we don't have to worry
270 * about frames that came in while we were doing that,
271 * which would require us to put them to the AC pending
272 * afterwards which just makes the code more complex.
274 ieee80211_stop_queue_by_reason(
275 &local->hw, ieee80211_ac_from_tid(tid),
276 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
278 /* prepare A-MPDU MLME for Tx aggregation */
279 sta->ampdu_mlme.tid_tx[tid] =
280 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
281 if (!sta->ampdu_mlme.tid_tx[tid]) {
282 #ifdef CONFIG_MAC80211_HT_DEBUG
283 if (net_ratelimit())
284 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
285 tid);
286 #endif
287 ret = -ENOMEM;
288 goto err_wake_queue;
291 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending);
293 /* Tx timer */
294 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
295 sta_addba_resp_timer_expired;
296 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
297 (unsigned long)&sta->timer_to_tid[tid];
298 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
300 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
301 * call back right away, it must see that the flow has begun */
302 *state |= HT_ADDBA_REQUESTED_MSK;
304 start_seq_num = sta->tid_seq[tid] >> 4;
306 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
307 pubsta, tid, &start_seq_num);
309 if (ret) {
310 #ifdef CONFIG_MAC80211_HT_DEBUG
311 printk(KERN_DEBUG "BA request denied - HW unavailable for"
312 " tid %d\n", tid);
313 #endif /* CONFIG_MAC80211_HT_DEBUG */
314 *state = HT_AGG_STATE_IDLE;
315 goto err_free;
318 /* Driver vetoed or OKed, but we can take packets again now */
319 ieee80211_wake_queue_by_reason(
320 &local->hw, ieee80211_ac_from_tid(tid),
321 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
323 spin_unlock(&local->ampdu_lock);
324 spin_unlock_bh(&sta->lock);
326 /* send an addBA request */
327 sta->ampdu_mlme.dialog_token_allocator++;
328 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
329 sta->ampdu_mlme.dialog_token_allocator;
330 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
332 ieee80211_send_addba_request(sdata, pubsta->addr, tid,
333 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
334 sta->ampdu_mlme.tid_tx[tid]->ssn,
335 0x40, 5000);
336 sta->ampdu_mlme.addba_req_num[tid]++;
337 /* activate the timer for the recipient's addBA response */
338 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
339 jiffies + ADDBA_RESP_INTERVAL;
340 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
341 #ifdef CONFIG_MAC80211_HT_DEBUG
342 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
343 #endif
344 return 0;
346 err_free:
347 kfree(sta->ampdu_mlme.tid_tx[tid]);
348 sta->ampdu_mlme.tid_tx[tid] = NULL;
349 err_wake_queue:
350 ieee80211_wake_queue_by_reason(
351 &local->hw, ieee80211_ac_from_tid(tid),
352 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
353 err_unlock_sta:
354 spin_unlock(&local->ampdu_lock);
355 spin_unlock_bh(&sta->lock);
356 return ret;
358 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
361 * splice packets from the STA's pending to the local pending,
362 * requires a call to ieee80211_agg_splice_finish and holding
363 * local->ampdu_lock across both calls.
365 static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
366 struct sta_info *sta, u16 tid)
368 unsigned long flags;
369 u16 queue = ieee80211_ac_from_tid(tid);
371 ieee80211_stop_queue_by_reason(
372 &local->hw, queue,
373 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
375 if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK))
376 return;
378 if (WARN(!sta->ampdu_mlme.tid_tx[tid],
379 "TID %d gone but expected when splicing aggregates from"
380 "the pending queue\n", tid))
381 return;
383 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) {
384 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
385 /* copy over remaining packets */
386 skb_queue_splice_tail_init(
387 &sta->ampdu_mlme.tid_tx[tid]->pending,
388 &local->pending[queue]);
389 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
393 static void ieee80211_agg_splice_finish(struct ieee80211_local *local,
394 struct sta_info *sta, u16 tid)
396 u16 queue = ieee80211_ac_from_tid(tid);
398 ieee80211_wake_queue_by_reason(
399 &local->hw, queue,
400 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
403 /* caller must hold sta->lock */
404 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
405 struct sta_info *sta, u16 tid)
407 #ifdef CONFIG_MAC80211_HT_DEBUG
408 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
409 #endif
411 spin_lock(&local->ampdu_lock);
412 ieee80211_agg_splice_packets(local, sta, tid);
414 * NB: we rely on sta->lock being taken in the TX
415 * processing here when adding to the pending queue,
416 * otherwise we could only change the state of the
417 * session to OPERATIONAL _here_.
419 ieee80211_agg_splice_finish(local, sta, tid);
420 spin_unlock(&local->ampdu_lock);
422 drv_ampdu_action(local, sta->sdata,
423 IEEE80211_AMPDU_TX_OPERATIONAL,
424 &sta->sta, tid, NULL);
427 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
429 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
430 struct ieee80211_local *local = sdata->local;
431 struct sta_info *sta;
432 u8 *state;
434 if (tid >= STA_TID_NUM) {
435 #ifdef CONFIG_MAC80211_HT_DEBUG
436 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
437 tid, STA_TID_NUM);
438 #endif
439 return;
442 rcu_read_lock();
443 sta = sta_info_get(sdata, ra);
444 if (!sta) {
445 rcu_read_unlock();
446 #ifdef CONFIG_MAC80211_HT_DEBUG
447 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
448 #endif
449 return;
452 state = &sta->ampdu_mlme.tid_state_tx[tid];
453 spin_lock_bh(&sta->lock);
455 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) {
456 #ifdef CONFIG_MAC80211_HT_DEBUG
457 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
458 *state);
459 #endif
460 spin_unlock_bh(&sta->lock);
461 rcu_read_unlock();
462 return;
465 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK))
466 goto out;
468 *state |= HT_ADDBA_DRV_READY_MSK;
470 if (*state == HT_AGG_STATE_OPERATIONAL)
471 ieee80211_agg_tx_operational(local, sta, tid);
473 out:
474 spin_unlock_bh(&sta->lock);
475 rcu_read_unlock();
477 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
479 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
480 const u8 *ra, u16 tid)
482 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
483 struct ieee80211_local *local = sdata->local;
484 struct ieee80211_ra_tid *ra_tid;
485 struct sk_buff *skb = dev_alloc_skb(0);
487 if (unlikely(!skb)) {
488 #ifdef CONFIG_MAC80211_HT_DEBUG
489 if (net_ratelimit())
490 printk(KERN_WARNING "%s: Not enough memory, "
491 "dropping start BA session", sdata->name);
492 #endif
493 return;
495 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
496 memcpy(&ra_tid->ra, ra, ETH_ALEN);
497 ra_tid->tid = tid;
498 ra_tid->vif = vif;
500 skb->pkt_type = IEEE80211_ADDBA_MSG;
501 skb_queue_tail(&local->skb_queue, skb);
502 tasklet_schedule(&local->tasklet);
504 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
506 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
507 enum ieee80211_back_parties initiator)
509 u8 *state;
510 int ret;
512 /* check if the TID is in aggregation */
513 state = &sta->ampdu_mlme.tid_state_tx[tid];
514 spin_lock_bh(&sta->lock);
516 if (*state != HT_AGG_STATE_OPERATIONAL) {
517 ret = -ENOENT;
518 goto unlock;
521 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
523 unlock:
524 spin_unlock_bh(&sta->lock);
525 return ret;
528 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
529 enum ieee80211_back_parties initiator)
531 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
532 struct ieee80211_sub_if_data *sdata = sta->sdata;
533 struct ieee80211_local *local = sdata->local;
535 if (!local->ops->ampdu_action)
536 return -EINVAL;
538 if (tid >= STA_TID_NUM)
539 return -EINVAL;
541 return __ieee80211_stop_tx_ba_session(sta, tid, initiator);
543 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
545 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
547 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
548 struct ieee80211_local *local = sdata->local;
549 struct sta_info *sta;
550 u8 *state;
552 if (tid >= STA_TID_NUM) {
553 #ifdef CONFIG_MAC80211_HT_DEBUG
554 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
555 tid, STA_TID_NUM);
556 #endif
557 return;
560 #ifdef CONFIG_MAC80211_HT_DEBUG
561 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
562 ra, tid);
563 #endif /* CONFIG_MAC80211_HT_DEBUG */
565 rcu_read_lock();
566 sta = sta_info_get(sdata, ra);
567 if (!sta) {
568 #ifdef CONFIG_MAC80211_HT_DEBUG
569 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
570 #endif
571 rcu_read_unlock();
572 return;
574 state = &sta->ampdu_mlme.tid_state_tx[tid];
576 /* NOTE: no need to use sta->lock in this state check, as
577 * ieee80211_stop_tx_ba_session will let only one stop call to
578 * pass through per sta/tid
580 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
583 #endif
584 rcu_read_unlock();
585 return;
588 if (*state & HT_AGG_STATE_INITIATOR_MSK)
589 ieee80211_send_delba(sta->sdata, ra, tid,
590 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
592 spin_lock_bh(&sta->lock);
593 spin_lock(&local->ampdu_lock);
595 ieee80211_agg_splice_packets(local, sta, tid);
597 *state = HT_AGG_STATE_IDLE;
598 /* from now on packets are no longer put onto sta->pending */
599 kfree(sta->ampdu_mlme.tid_tx[tid]);
600 sta->ampdu_mlme.tid_tx[tid] = NULL;
602 ieee80211_agg_splice_finish(local, sta, tid);
604 spin_unlock(&local->ampdu_lock);
605 spin_unlock_bh(&sta->lock);
607 rcu_read_unlock();
609 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
611 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
612 const u8 *ra, u16 tid)
614 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
615 struct ieee80211_local *local = sdata->local;
616 struct ieee80211_ra_tid *ra_tid;
617 struct sk_buff *skb = dev_alloc_skb(0);
619 if (unlikely(!skb)) {
620 #ifdef CONFIG_MAC80211_HT_DEBUG
621 if (net_ratelimit())
622 printk(KERN_WARNING "%s: Not enough memory, "
623 "dropping stop BA session", sdata->name);
624 #endif
625 return;
627 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
628 memcpy(&ra_tid->ra, ra, ETH_ALEN);
629 ra_tid->tid = tid;
630 ra_tid->vif = vif;
632 skb->pkt_type = IEEE80211_DELBA_MSG;
633 skb_queue_tail(&local->skb_queue, skb);
634 tasklet_schedule(&local->tasklet);
636 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
639 void ieee80211_process_addba_resp(struct ieee80211_local *local,
640 struct sta_info *sta,
641 struct ieee80211_mgmt *mgmt,
642 size_t len)
644 u16 capab, tid;
645 u8 *state;
647 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
648 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
650 state = &sta->ampdu_mlme.tid_state_tx[tid];
652 spin_lock_bh(&sta->lock);
654 if (!(*state & HT_ADDBA_REQUESTED_MSK))
655 goto out;
657 if (mgmt->u.action.u.addba_resp.dialog_token !=
658 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
659 #ifdef CONFIG_MAC80211_HT_DEBUG
660 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
661 #endif /* CONFIG_MAC80211_HT_DEBUG */
662 goto out;
665 del_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
667 #ifdef CONFIG_MAC80211_HT_DEBUG
668 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
669 #endif /* CONFIG_MAC80211_HT_DEBUG */
671 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
672 == WLAN_STATUS_SUCCESS) {
673 u8 curstate = *state;
675 *state |= HT_ADDBA_RECEIVED_MSK;
677 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL)
678 ieee80211_agg_tx_operational(local, sta, tid);
680 sta->ampdu_mlme.addba_req_num[tid] = 0;
681 } else {
682 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
685 out:
686 spin_unlock_bh(&sta->lock);