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-rw-r--r--net/mac80211/agg-tx.c695
1 files changed, 695 insertions, 0 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
new file mode 100644
index 000000000000..947aaaad35d2
--- /dev/null
+++ b/net/mac80211/agg-tx.c
@@ -0,0 +1,695 @@
1/*
2 * HT handling
3 *
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
10 *
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.
14 */
15
16#include <linux/ieee80211.h>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "wme.h"
20
21/**
22 * DOC: TX aggregation
23 *
24 * Aggregation on the TX side requires setting the hardware flag
25 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
26 * hardware parameter to the number of hardware AMPDU queues. If there are no
27 * hardware queues then the driver will (currently) have to do all frame
28 * buffering.
29 *
30 * When TX aggregation is started by some subsystem (usually the rate control
31 * algorithm would be appropriate) by calling the
32 * ieee80211_start_tx_ba_session() function, the driver will be notified via
33 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
34 *
35 * In response to that, the driver is later required to call the
36 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
37 * function, which will start the aggregation session.
38 *
39 * Similarly, when the aggregation session is stopped by
40 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
41 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
42 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
43 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
44 */
45
46static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
47 const u8 *da, u16 tid,
48 u8 dialog_token, u16 start_seq_num,
49 u16 agg_size, u16 timeout)
50{
51 struct ieee80211_local *local = sdata->local;
52 struct sk_buff *skb;
53 struct ieee80211_mgmt *mgmt;
54 u16 capab;
55
56 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
57
58 if (!skb) {
59 printk(KERN_ERR "%s: failed to allocate buffer "
60 "for addba request frame\n", sdata->dev->name);
61 return;
62 }
63 skb_reserve(skb, local->hw.extra_tx_headroom);
64 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
65 memset(mgmt, 0, 24);
66 memcpy(mgmt->da, da, ETH_ALEN);
67 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
68 if (sdata->vif.type == NL80211_IFTYPE_AP ||
69 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
70 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
71 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
72 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
73
74 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
75 IEEE80211_STYPE_ACTION);
76
77 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
78
79 mgmt->u.action.category = WLAN_CATEGORY_BACK;
80 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
81
82 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
83 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
84 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
85 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
86
87 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
88
89 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
90 mgmt->u.action.u.addba_req.start_seq_num =
91 cpu_to_le16(start_seq_num << 4);
92
93 ieee80211_tx_skb(sdata, skb, 1);
94}
95
96void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
97{
98 struct ieee80211_local *local = sdata->local;
99 struct sk_buff *skb;
100 struct ieee80211_bar *bar;
101 u16 bar_control = 0;
102
103 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
104 if (!skb) {
105 printk(KERN_ERR "%s: failed to allocate buffer for "
106 "bar frame\n", sdata->dev->name);
107 return;
108 }
109 skb_reserve(skb, local->hw.extra_tx_headroom);
110 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
111 memset(bar, 0, sizeof(*bar));
112 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
113 IEEE80211_STYPE_BACK_REQ);
114 memcpy(bar->ra, ra, ETH_ALEN);
115 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
116 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
117 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
118 bar_control |= (u16)(tid << 12);
119 bar->control = cpu_to_le16(bar_control);
120 bar->start_seq_num = cpu_to_le16(ssn);
121
122 ieee80211_tx_skb(sdata, skb, 0);
123}
124
125static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
126 enum ieee80211_back_parties initiator)
127{
128 struct ieee80211_local *local = sta->local;
129 int ret;
130 u8 *state;
131
132 state = &sta->ampdu_mlme.tid_state_tx[tid];
133
134 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
135 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
136
137 ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP,
138 &sta->sta, tid, NULL);
139
140 /* HW shall not deny going back to legacy */
141 if (WARN_ON(ret)) {
142 *state = HT_AGG_STATE_OPERATIONAL;
143 /*
144 * We may have pending packets get stuck in this case...
145 * Not bothering with a workaround for now.
146 */
147 }
148
149 return ret;
150}
151
152/*
153 * After sending add Block Ack request we activated a timer until
154 * add Block Ack response will arrive from the recipient.
155 * If this timer expires sta_addba_resp_timer_expired will be executed.
156 */
157static void sta_addba_resp_timer_expired(unsigned long data)
158{
159 /* not an elegant detour, but there is no choice as the timer passes
160 * only one argument, and both sta_info and TID are needed, so init
161 * flow in sta_info_create gives the TID as data, while the timer_to_id
162 * array gives the sta through container_of */
163 u16 tid = *(u8 *)data;
164 struct sta_info *sta = container_of((void *)data,
165 struct sta_info, timer_to_tid[tid]);
166 u8 *state;
167
168 state = &sta->ampdu_mlme.tid_state_tx[tid];
169
170 /* check if the TID waits for addBA response */
171 spin_lock_bh(&sta->lock);
172 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
173 spin_unlock_bh(&sta->lock);
174 *state = HT_AGG_STATE_IDLE;
175#ifdef CONFIG_MAC80211_HT_DEBUG
176 printk(KERN_DEBUG "timer expired on tid %d but we are not "
177 "expecting addBA response there", tid);
178#endif
179 return;
180 }
181
182#ifdef CONFIG_MAC80211_HT_DEBUG
183 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
184#endif
185
186 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
187 spin_unlock_bh(&sta->lock);
188}
189
190static inline int ieee80211_ac_from_tid(int tid)
191{
192 return ieee802_1d_to_ac[tid & 7];
193}
194
195int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
196{
197 struct ieee80211_local *local = hw_to_local(hw);
198 struct sta_info *sta;
199 struct ieee80211_sub_if_data *sdata;
200 u8 *state;
201 int ret = 0;
202 u16 start_seq_num;
203
204 if (WARN_ON(!local->ops->ampdu_action))
205 return -EINVAL;
206
207 if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
208 return -EINVAL;
209
210#ifdef CONFIG_MAC80211_HT_DEBUG
211 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
212 ra, tid);
213#endif /* CONFIG_MAC80211_HT_DEBUG */
214
215 rcu_read_lock();
216
217 sta = sta_info_get(local, ra);
218 if (!sta) {
219#ifdef CONFIG_MAC80211_HT_DEBUG
220 printk(KERN_DEBUG "Could not find the station\n");
221#endif
222 ret = -ENOENT;
223 goto unlock;
224 }
225
226 /*
227 * The aggregation code is not prepared to handle
228 * anything but STA/AP due to the BSSID handling.
229 * IBSS could work in the code but isn't supported
230 * by drivers or the standard.
231 */
232 if (sta->sdata->vif.type != NL80211_IFTYPE_STATION &&
233 sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
234 sta->sdata->vif.type != NL80211_IFTYPE_AP) {
235 ret = -EINVAL;
236 goto unlock;
237 }
238
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 ret = -EINVAL;
245 goto unlock;
246 }
247
248 spin_lock_bh(&sta->lock);
249 spin_lock(&local->ampdu_lock);
250
251 sdata = sta->sdata;
252
253 /* we have tried too many times, receiver does not want A-MPDU */
254 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
255 ret = -EBUSY;
256 goto err_unlock_sta;
257 }
258
259 state = &sta->ampdu_mlme.tid_state_tx[tid];
260 /* check if the TID is not in aggregation flow already */
261 if (*state != HT_AGG_STATE_IDLE) {
262#ifdef CONFIG_MAC80211_HT_DEBUG
263 printk(KERN_DEBUG "BA request denied - session is not "
264 "idle on tid %u\n", tid);
265#endif /* CONFIG_MAC80211_HT_DEBUG */
266 ret = -EAGAIN;
267 goto err_unlock_sta;
268 }
269
270 /*
271 * While we're asking the driver about the aggregation,
272 * stop the AC queue so that we don't have to worry
273 * about frames that came in while we were doing that,
274 * which would require us to put them to the AC pending
275 * afterwards which just makes the code more complex.
276 */
277 ieee80211_stop_queue_by_reason(
278 &local->hw, ieee80211_ac_from_tid(tid),
279 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
280
281 /* prepare A-MPDU MLME for Tx aggregation */
282 sta->ampdu_mlme.tid_tx[tid] =
283 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
284 if (!sta->ampdu_mlme.tid_tx[tid]) {
285#ifdef CONFIG_MAC80211_HT_DEBUG
286 if (net_ratelimit())
287 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
288 tid);
289#endif
290 ret = -ENOMEM;
291 goto err_wake_queue;
292 }
293
294 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending);
295
296 /* Tx timer */
297 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
298 sta_addba_resp_timer_expired;
299 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
300 (unsigned long)&sta->timer_to_tid[tid];
301 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
302
303 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
304 * call back right away, it must see that the flow has begun */
305 *state |= HT_ADDBA_REQUESTED_MSK;
306
307 start_seq_num = sta->tid_seq[tid];
308
309 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
310 &sta->sta, tid, &start_seq_num);
311
312 if (ret) {
313#ifdef CONFIG_MAC80211_HT_DEBUG
314 printk(KERN_DEBUG "BA request denied - HW unavailable for"
315 " tid %d\n", tid);
316#endif /* CONFIG_MAC80211_HT_DEBUG */
317 *state = HT_AGG_STATE_IDLE;
318 goto err_free;
319 }
320
321 /* Driver vetoed or OKed, but we can take packets again now */
322 ieee80211_wake_queue_by_reason(
323 &local->hw, ieee80211_ac_from_tid(tid),
324 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
325
326 spin_unlock(&local->ampdu_lock);
327 spin_unlock_bh(&sta->lock);
328
329 /* send an addBA request */
330 sta->ampdu_mlme.dialog_token_allocator++;
331 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
332 sta->ampdu_mlme.dialog_token_allocator;
333 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
334
335 ieee80211_send_addba_request(sta->sdata, ra, tid,
336 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
337 sta->ampdu_mlme.tid_tx[tid]->ssn,
338 0x40, 5000);
339 /* activate the timer for the recipient's addBA response */
340 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
341 jiffies + ADDBA_RESP_INTERVAL;
342 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
343#ifdef CONFIG_MAC80211_HT_DEBUG
344 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
345#endif
346 goto unlock;
347
348 err_free:
349 kfree(sta->ampdu_mlme.tid_tx[tid]);
350 sta->ampdu_mlme.tid_tx[tid] = NULL;
351 err_wake_queue:
352 ieee80211_wake_queue_by_reason(
353 &local->hw, ieee80211_ac_from_tid(tid),
354 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
355 err_unlock_sta:
356 spin_unlock(&local->ampdu_lock);
357 spin_unlock_bh(&sta->lock);
358 unlock:
359 rcu_read_unlock();
360 return ret;
361}
362EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
363
364/*
365 * splice packets from the STA's pending to the local pending,
366 * requires a call to ieee80211_agg_splice_finish and holding
367 * local->ampdu_lock across both calls.
368 */
369static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
370 struct sta_info *sta, u16 tid)
371{
372 unsigned long flags;
373 u16 queue = ieee80211_ac_from_tid(tid);
374
375 ieee80211_stop_queue_by_reason(
376 &local->hw, queue,
377 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
378
379 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) {
380 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
381 /* mark queue as pending, it is stopped already */
382 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING,
383 &local->queue_stop_reasons[queue]);
384 /* copy over remaining packets */
385 skb_queue_splice_tail_init(
386 &sta->ampdu_mlme.tid_tx[tid]->pending,
387 &local->pending[queue]);
388 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
389 }
390}
391
392static void ieee80211_agg_splice_finish(struct ieee80211_local *local,
393 struct sta_info *sta, u16 tid)
394{
395 u16 queue = ieee80211_ac_from_tid(tid);
396
397 ieee80211_wake_queue_by_reason(
398 &local->hw, queue,
399 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
400}
401
402/* caller must hold sta->lock */
403static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
404 struct sta_info *sta, u16 tid)
405{
406#ifdef CONFIG_MAC80211_HT_DEBUG
407 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
408#endif
409
410 spin_lock(&local->ampdu_lock);
411 ieee80211_agg_splice_packets(local, sta, tid);
412 /*
413 * NB: we rely on sta->lock being taken in the TX
414 * processing here when adding to the pending queue,
415 * otherwise we could only change the state of the
416 * session to OPERATIONAL _here_.
417 */
418 ieee80211_agg_splice_finish(local, sta, tid);
419 spin_unlock(&local->ampdu_lock);
420
421 local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_OPERATIONAL,
422 &sta->sta, tid, NULL);
423}
424
425void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
426{
427 struct ieee80211_local *local = hw_to_local(hw);
428 struct sta_info *sta;
429 u8 *state;
430
431 if (tid >= STA_TID_NUM) {
432#ifdef CONFIG_MAC80211_HT_DEBUG
433 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
434 tid, STA_TID_NUM);
435#endif
436 return;
437 }
438
439 rcu_read_lock();
440 sta = sta_info_get(local, ra);
441 if (!sta) {
442 rcu_read_unlock();
443#ifdef CONFIG_MAC80211_HT_DEBUG
444 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
445#endif
446 return;
447 }
448
449 state = &sta->ampdu_mlme.tid_state_tx[tid];
450 spin_lock_bh(&sta->lock);
451
452 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) {
453#ifdef CONFIG_MAC80211_HT_DEBUG
454 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
455 *state);
456#endif
457 spin_unlock_bh(&sta->lock);
458 rcu_read_unlock();
459 return;
460 }
461
462 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK))
463 goto out;
464
465 *state |= HT_ADDBA_DRV_READY_MSK;
466
467 if (*state == HT_AGG_STATE_OPERATIONAL)
468 ieee80211_agg_tx_operational(local, sta, tid);
469
470 out:
471 spin_unlock_bh(&sta->lock);
472 rcu_read_unlock();
473}
474EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
475
476void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
477 const u8 *ra, u16 tid)
478{
479 struct ieee80211_local *local = hw_to_local(hw);
480 struct ieee80211_ra_tid *ra_tid;
481 struct sk_buff *skb = dev_alloc_skb(0);
482
483 if (unlikely(!skb)) {
484#ifdef CONFIG_MAC80211_HT_DEBUG
485 if (net_ratelimit())
486 printk(KERN_WARNING "%s: Not enough memory, "
487 "dropping start BA session", skb->dev->name);
488#endif
489 return;
490 }
491 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
492 memcpy(&ra_tid->ra, ra, ETH_ALEN);
493 ra_tid->tid = tid;
494
495 skb->pkt_type = IEEE80211_ADDBA_MSG;
496 skb_queue_tail(&local->skb_queue, skb);
497 tasklet_schedule(&local->tasklet);
498}
499EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
500
501int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
502 enum ieee80211_back_parties initiator)
503{
504 u8 *state;
505 int ret;
506
507 /* check if the TID is in aggregation */
508 state = &sta->ampdu_mlme.tid_state_tx[tid];
509 spin_lock_bh(&sta->lock);
510
511 if (*state != HT_AGG_STATE_OPERATIONAL) {
512 ret = -ENOENT;
513 goto unlock;
514 }
515
516#ifdef CONFIG_MAC80211_HT_DEBUG
517 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
518 sta->sta.addr, tid);
519#endif /* CONFIG_MAC80211_HT_DEBUG */
520
521 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
522
523 unlock:
524 spin_unlock_bh(&sta->lock);
525 return ret;
526}
527
528int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
529 u8 *ra, u16 tid,
530 enum ieee80211_back_parties initiator)
531{
532 struct ieee80211_local *local = hw_to_local(hw);
533 struct sta_info *sta;
534 int ret = 0;
535
536 if (WARN_ON(!local->ops->ampdu_action))
537 return -EINVAL;
538
539 if (tid >= STA_TID_NUM)
540 return -EINVAL;
541
542 rcu_read_lock();
543 sta = sta_info_get(local, ra);
544 if (!sta) {
545 rcu_read_unlock();
546 return -ENOENT;
547 }
548
549 ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator);
550 rcu_read_unlock();
551 return ret;
552}
553EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
554
555void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
556{
557 struct ieee80211_local *local = hw_to_local(hw);
558 struct sta_info *sta;
559 u8 *state;
560
561 if (tid >= STA_TID_NUM) {
562#ifdef CONFIG_MAC80211_HT_DEBUG
563 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
564 tid, STA_TID_NUM);
565#endif
566 return;
567 }
568
569#ifdef CONFIG_MAC80211_HT_DEBUG
570 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
571 ra, tid);
572#endif /* CONFIG_MAC80211_HT_DEBUG */
573
574 rcu_read_lock();
575 sta = sta_info_get(local, ra);
576 if (!sta) {
577#ifdef CONFIG_MAC80211_HT_DEBUG
578 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
579#endif
580 rcu_read_unlock();
581 return;
582 }
583 state = &sta->ampdu_mlme.tid_state_tx[tid];
584
585 /* NOTE: no need to use sta->lock in this state check, as
586 * ieee80211_stop_tx_ba_session will let only one stop call to
587 * pass through per sta/tid
588 */
589 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
590#ifdef CONFIG_MAC80211_HT_DEBUG
591 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
592#endif
593 rcu_read_unlock();
594 return;
595 }
596
597 if (*state & HT_AGG_STATE_INITIATOR_MSK)
598 ieee80211_send_delba(sta->sdata, ra, tid,
599 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
600
601 spin_lock_bh(&sta->lock);
602 spin_lock(&local->ampdu_lock);
603
604 ieee80211_agg_splice_packets(local, sta, tid);
605
606 *state = HT_AGG_STATE_IDLE;
607 /* from now on packets are no longer put onto sta->pending */
608 sta->ampdu_mlme.addba_req_num[tid] = 0;
609 kfree(sta->ampdu_mlme.tid_tx[tid]);
610 sta->ampdu_mlme.tid_tx[tid] = NULL;
611
612 ieee80211_agg_splice_finish(local, sta, tid);
613
614 spin_unlock(&local->ampdu_lock);
615 spin_unlock_bh(&sta->lock);
616
617 rcu_read_unlock();
618}
619EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
620
621void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
622 const u8 *ra, u16 tid)
623{
624 struct ieee80211_local *local = hw_to_local(hw);
625 struct ieee80211_ra_tid *ra_tid;
626 struct sk_buff *skb = dev_alloc_skb(0);
627
628 if (unlikely(!skb)) {
629#ifdef CONFIG_MAC80211_HT_DEBUG
630 if (net_ratelimit())
631 printk(KERN_WARNING "%s: Not enough memory, "
632 "dropping stop BA session", skb->dev->name);
633#endif
634 return;
635 }
636 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
637 memcpy(&ra_tid->ra, ra, ETH_ALEN);
638 ra_tid->tid = tid;
639
640 skb->pkt_type = IEEE80211_DELBA_MSG;
641 skb_queue_tail(&local->skb_queue, skb);
642 tasklet_schedule(&local->tasklet);
643}
644EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
645
646
647void ieee80211_process_addba_resp(struct ieee80211_local *local,
648 struct sta_info *sta,
649 struct ieee80211_mgmt *mgmt,
650 size_t len)
651{
652 u16 capab, tid;
653 u8 *state;
654
655 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
656 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
657
658 state = &sta->ampdu_mlme.tid_state_tx[tid];
659
660 spin_lock_bh(&sta->lock);
661
662 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
663 spin_unlock_bh(&sta->lock);
664 return;
665 }
666
667 if (mgmt->u.action.u.addba_resp.dialog_token !=
668 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
669 spin_unlock_bh(&sta->lock);
670#ifdef CONFIG_MAC80211_HT_DEBUG
671 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
672#endif /* CONFIG_MAC80211_HT_DEBUG */
673 return;
674 }
675
676 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
677#ifdef CONFIG_MAC80211_HT_DEBUG
678 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
679#endif /* CONFIG_MAC80211_HT_DEBUG */
680 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
681 == WLAN_STATUS_SUCCESS) {
682 u8 curstate = *state;
683
684 *state |= HT_ADDBA_RECEIVED_MSK;
685
686 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL)
687 ieee80211_agg_tx_operational(local, sta, tid);
688
689 sta->ampdu_mlme.addba_req_num[tid] = 0;
690 } else {
691 sta->ampdu_mlme.addba_req_num[tid]++;
692 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
693 }
694 spin_unlock_bh(&sta->lock);
695}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 07:23:08 -0500