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
);
74 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
75 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
77 memcpy(mgmt
->da
, da
, ETH_ALEN
);
78 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
79 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
80 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
81 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
82 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
83 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
85 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
86 IEEE80211_STYPE_ACTION
);
88 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
90 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
91 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
93 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
94 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
95 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
96 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
98 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
100 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
101 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
102 cpu_to_le16(start_seq_num
<< 4);
104 ieee80211_tx_skb(sdata
, skb
);
107 void ieee80211_send_bar(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
, u16 ssn
)
109 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
110 struct ieee80211_local
*local
= sdata
->local
;
112 struct ieee80211_bar
*bar
;
115 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
119 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
120 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
121 memset(bar
, 0, sizeof(*bar
));
122 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
123 IEEE80211_STYPE_BACK_REQ
);
124 memcpy(bar
->ra
, ra
, ETH_ALEN
);
125 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
126 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
127 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
128 bar_control
|= (u16
)(tid
<< IEEE80211_BAR_CTRL_TID_INFO_SHIFT
);
129 bar
->control
= cpu_to_le16(bar_control
);
130 bar
->start_seq_num
= cpu_to_le16(ssn
);
132 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
133 ieee80211_tx_skb(sdata
, skb
);
135 EXPORT_SYMBOL(ieee80211_send_bar
);
137 void ieee80211_assign_tid_tx(struct sta_info
*sta
, int tid
,
138 struct tid_ampdu_tx
*tid_tx
)
140 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
141 lockdep_assert_held(&sta
->lock
);
142 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
145 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
146 enum ieee80211_back_parties initiator
,
149 struct ieee80211_local
*local
= sta
->local
;
150 struct tid_ampdu_tx
*tid_tx
;
153 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
155 spin_lock_bh(&sta
->lock
);
157 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
159 spin_unlock_bh(&sta
->lock
);
163 /* if we're already stopping ignore any new requests to stop */
164 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
165 spin_unlock_bh(&sta
->lock
);
169 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
170 /* not even started yet! */
171 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
172 spin_unlock_bh(&sta
->lock
);
173 kfree_rcu(tid_tx
, rcu_head
);
177 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
179 spin_unlock_bh(&sta
->lock
);
181 #ifdef CONFIG_MAC80211_HT_DEBUG
182 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
184 #endif /* CONFIG_MAC80211_HT_DEBUG */
186 del_timer_sync(&tid_tx
->addba_resp_timer
);
189 * After this packets are no longer handed right through
190 * to the driver but are put onto tid_tx->pending instead,
191 * with locking to ensure proper access.
193 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
196 * There might be a few packets being processed right now (on
197 * another CPU) that have already gotten past the aggregation
198 * check when it was still OPERATIONAL and consequently have
199 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
200 * call into the driver at the same time or even before the
201 * TX paths calls into it, which could confuse the driver.
203 * Wait for all currently running TX paths to finish before
204 * telling the driver. New packets will not go through since
205 * the aggregation session is no longer OPERATIONAL.
209 tid_tx
->stop_initiator
= initiator
;
210 tid_tx
->tx_stop
= tx
;
212 ret
= drv_ampdu_action(local
, sta
->sdata
,
213 IEEE80211_AMPDU_TX_STOP
,
214 &sta
->sta
, tid
, NULL
, 0);
216 /* HW shall not deny going back to legacy */
219 * We may have pending packets get stuck in this case...
220 * Not bothering with a workaround for now.
228 * After sending add Block Ack request we activated a timer until
229 * add Block Ack response will arrive from the recipient.
230 * If this timer expires sta_addba_resp_timer_expired will be executed.
232 static void sta_addba_resp_timer_expired(unsigned long data
)
234 /* not an elegant detour, but there is no choice as the timer passes
235 * only one argument, and both sta_info and TID are needed, so init
236 * flow in sta_info_create gives the TID as data, while the timer_to_id
237 * array gives the sta through container_of */
238 u16 tid
= *(u8
*)data
;
239 struct sta_info
*sta
= container_of((void *)data
,
240 struct sta_info
, timer_to_tid
[tid
]);
241 struct tid_ampdu_tx
*tid_tx
;
243 /* check if the TID waits for addBA response */
245 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
247 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
249 #ifdef CONFIG_MAC80211_HT_DEBUG
250 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
251 "(or no longer) expecting addBA response there\n",
257 #ifdef CONFIG_MAC80211_HT_DEBUG
258 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
261 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
265 static inline int ieee80211_ac_from_tid(int tid
)
267 return ieee802_1d_to_ac
[tid
& 7];
271 * When multiple aggregation sessions on multiple stations
272 * are being created/destroyed simultaneously, we need to
273 * refcount the global queue stop caused by that in order
274 * to not get into a situation where one of the aggregation
275 * setup or teardown re-enables queues before the other is
276 * ready to handle that.
278 * These two functions take care of this issue by keeping
279 * a global "agg_queue_stop" refcount.
281 static void __acquires(agg_queue
)
282 ieee80211_stop_queue_agg(struct ieee80211_local
*local
, int tid
)
284 int queue
= ieee80211_ac_from_tid(tid
);
286 if (atomic_inc_return(&local
->agg_queue_stop
[queue
]) == 1)
287 ieee80211_stop_queue_by_reason(
289 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
290 __acquire(agg_queue
);
293 static void __releases(agg_queue
)
294 ieee80211_wake_queue_agg(struct ieee80211_local
*local
, int tid
)
296 int queue
= ieee80211_ac_from_tid(tid
);
298 if (atomic_dec_return(&local
->agg_queue_stop
[queue
]) == 0)
299 ieee80211_wake_queue_by_reason(
301 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
302 __release(agg_queue
);
305 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
307 struct tid_ampdu_tx
*tid_tx
;
308 struct ieee80211_local
*local
= sta
->local
;
309 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
313 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
316 * While we're asking the driver about the aggregation,
317 * stop the AC queue so that we don't have to worry
318 * about frames that came in while we were doing that,
319 * which would require us to put them to the AC pending
320 * afterwards which just makes the code more complex.
322 ieee80211_stop_queue_agg(local
, tid
);
324 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
327 * make sure no packets are being processed to get
328 * valid starting sequence number
332 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
334 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
335 &sta
->sta
, tid
, &start_seq_num
, 0);
337 #ifdef CONFIG_MAC80211_HT_DEBUG
338 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
341 spin_lock_bh(&sta
->lock
);
342 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
343 spin_unlock_bh(&sta
->lock
);
345 ieee80211_wake_queue_agg(local
, tid
);
346 kfree_rcu(tid_tx
, rcu_head
);
350 /* we can take packets again now */
351 ieee80211_wake_queue_agg(local
, tid
);
353 /* activate the timer for the recipient's addBA response */
354 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
355 #ifdef CONFIG_MAC80211_HT_DEBUG
356 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
359 spin_lock_bh(&sta
->lock
);
360 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
361 spin_unlock_bh(&sta
->lock
);
363 /* send AddBA request */
364 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
365 tid_tx
->dialog_token
, start_seq_num
,
366 local
->hw
.max_tx_aggregation_subframes
,
370 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
373 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
374 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
375 struct ieee80211_local
*local
= sdata
->local
;
376 struct tid_ampdu_tx
*tid_tx
;
379 trace_api_start_tx_ba_session(pubsta
, tid
);
381 if (WARN_ON(!local
->ops
->ampdu_action
))
384 if ((tid
>= STA_TID_NUM
) ||
385 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
386 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
389 #ifdef CONFIG_MAC80211_HT_DEBUG
390 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
392 #endif /* CONFIG_MAC80211_HT_DEBUG */
395 * The aggregation code is not prepared to handle
396 * anything but STA/AP due to the BSSID handling.
397 * IBSS could work in the code but isn't supported
398 * by drivers or the standard.
400 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
401 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
402 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
405 if (test_sta_flag(sta
, WLAN_STA_BLOCK_BA
)) {
406 #ifdef CONFIG_MAC80211_HT_DEBUG
407 printk(KERN_DEBUG
"BA sessions blocked. "
408 "Denying BA session request\n");
413 spin_lock_bh(&sta
->lock
);
415 /* we have tried too many times, receiver does not want A-MPDU */
416 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
421 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
422 /* check if the TID is not in aggregation flow already */
423 if (tid_tx
|| sta
->ampdu_mlme
.tid_start_tx
[tid
]) {
424 #ifdef CONFIG_MAC80211_HT_DEBUG
425 printk(KERN_DEBUG
"BA request denied - session is not "
426 "idle on tid %u\n", tid
);
427 #endif /* CONFIG_MAC80211_HT_DEBUG */
432 /* prepare A-MPDU MLME for Tx aggregation */
433 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
439 skb_queue_head_init(&tid_tx
->pending
);
440 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
442 tid_tx
->timeout
= timeout
;
445 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
446 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
447 init_timer(&tid_tx
->addba_resp_timer
);
449 /* assign a dialog token */
450 sta
->ampdu_mlme
.dialog_token_allocator
++;
451 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
454 * Finally, assign it to the start array; the work item will
455 * collect it and move it to the normal array.
457 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
459 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
461 /* this flow continues off the work */
463 spin_unlock_bh(&sta
->lock
);
466 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
469 * splice packets from the STA's pending to the local pending,
470 * requires a call to ieee80211_agg_splice_finish later
472 static void __acquires(agg_queue
)
473 ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
474 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
476 int queue
= ieee80211_ac_from_tid(tid
);
479 ieee80211_stop_queue_agg(local
, tid
);
481 if (WARN(!tid_tx
, "TID %d gone but expected when splicing aggregates"
482 " from the pending queue\n", tid
))
485 if (!skb_queue_empty(&tid_tx
->pending
)) {
486 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
487 /* copy over remaining packets */
488 skb_queue_splice_tail_init(&tid_tx
->pending
,
489 &local
->pending
[queue
]);
490 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
494 static void __releases(agg_queue
)
495 ieee80211_agg_splice_finish(struct ieee80211_local
*local
, u16 tid
)
497 ieee80211_wake_queue_agg(local
, tid
);
500 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
501 struct sta_info
*sta
, u16 tid
)
503 struct tid_ampdu_tx
*tid_tx
;
505 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
507 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
509 #ifdef CONFIG_MAC80211_HT_DEBUG
510 printk(KERN_DEBUG
"Aggregation is on for tid %d\n", tid
);
513 drv_ampdu_action(local
, sta
->sdata
,
514 IEEE80211_AMPDU_TX_OPERATIONAL
,
515 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
518 * synchronize with TX path, while splicing the TX path
519 * should block so it won't put more packets onto pending.
521 spin_lock_bh(&sta
->lock
);
523 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
525 * Now mark as operational. This will be visible
526 * in the TX path, and lets it go lock-free in
529 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
530 ieee80211_agg_splice_finish(local
, tid
);
532 spin_unlock_bh(&sta
->lock
);
535 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
537 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
538 struct ieee80211_local
*local
= sdata
->local
;
539 struct sta_info
*sta
;
540 struct tid_ampdu_tx
*tid_tx
;
542 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
544 if (tid
>= STA_TID_NUM
) {
545 #ifdef CONFIG_MAC80211_HT_DEBUG
546 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
552 mutex_lock(&local
->sta_mtx
);
553 sta
= sta_info_get(sdata
, ra
);
555 mutex_unlock(&local
->sta_mtx
);
556 #ifdef CONFIG_MAC80211_HT_DEBUG
557 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
562 mutex_lock(&sta
->ampdu_mlme
.mtx
);
563 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
565 if (WARN_ON(!tid_tx
)) {
566 #ifdef CONFIG_MAC80211_HT_DEBUG
567 printk(KERN_DEBUG
"addBA was not requested!\n");
572 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
575 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
576 ieee80211_agg_tx_operational(local
, sta
, tid
);
579 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
580 mutex_unlock(&local
->sta_mtx
);
583 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
584 const u8
*ra
, u16 tid
)
586 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
587 struct ieee80211_local
*local
= sdata
->local
;
588 struct ieee80211_ra_tid
*ra_tid
;
589 struct sk_buff
*skb
= dev_alloc_skb(0);
594 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
595 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
598 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
599 skb_queue_tail(&sdata
->skb_queue
, skb
);
600 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
602 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
604 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
605 enum ieee80211_back_parties initiator
,
610 mutex_lock(&sta
->ampdu_mlme
.mtx
);
612 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
614 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
619 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
621 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
622 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
623 struct ieee80211_local
*local
= sdata
->local
;
624 struct tid_ampdu_tx
*tid_tx
;
627 trace_api_stop_tx_ba_session(pubsta
, tid
);
629 if (!local
->ops
->ampdu_action
)
632 if (tid
>= STA_TID_NUM
)
635 spin_lock_bh(&sta
->lock
);
636 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
643 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
644 /* already in progress stopping it */
649 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
650 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
653 spin_unlock_bh(&sta
->lock
);
656 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
658 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
660 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
661 struct ieee80211_local
*local
= sdata
->local
;
662 struct sta_info
*sta
;
663 struct tid_ampdu_tx
*tid_tx
;
665 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
667 if (tid
>= STA_TID_NUM
) {
668 #ifdef CONFIG_MAC80211_HT_DEBUG
669 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
675 #ifdef CONFIG_MAC80211_HT_DEBUG
676 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
678 #endif /* CONFIG_MAC80211_HT_DEBUG */
680 mutex_lock(&local
->sta_mtx
);
682 sta
= sta_info_get(sdata
, ra
);
684 #ifdef CONFIG_MAC80211_HT_DEBUG
685 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
690 mutex_lock(&sta
->ampdu_mlme
.mtx
);
691 spin_lock_bh(&sta
->lock
);
692 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
694 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
695 #ifdef CONFIG_MAC80211_HT_DEBUG
696 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
701 if (tid_tx
->stop_initiator
== WLAN_BACK_INITIATOR
&& tid_tx
->tx_stop
)
702 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
703 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
706 * When we get here, the TX path will not be lockless any more wrt.
707 * aggregation, since the OPERATIONAL bit has long been cleared.
708 * Thus it will block on getting the lock, if it occurs. So if we
709 * stop the queue now, we will not get any more packets, and any
710 * that might be being processed will wait for us here, thereby
711 * guaranteeing that no packets go to the tid_tx pending queue any
715 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
717 /* future packets must not find the tid_tx struct any more */
718 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
720 ieee80211_agg_splice_finish(local
, tid
);
722 kfree_rcu(tid_tx
, rcu_head
);
725 spin_unlock_bh(&sta
->lock
);
726 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
728 mutex_unlock(&local
->sta_mtx
);
731 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
732 const u8
*ra
, u16 tid
)
734 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
735 struct ieee80211_local
*local
= sdata
->local
;
736 struct ieee80211_ra_tid
*ra_tid
;
737 struct sk_buff
*skb
= dev_alloc_skb(0);
742 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
743 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
746 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_STOP
;
747 skb_queue_tail(&sdata
->skb_queue
, skb
);
748 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
750 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
753 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
754 struct sta_info
*sta
,
755 struct ieee80211_mgmt
*mgmt
,
758 struct tid_ampdu_tx
*tid_tx
;
762 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
763 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
764 buf_size
= (capab
& IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK
) >> 6;
766 mutex_lock(&sta
->ampdu_mlme
.mtx
);
768 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
772 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!= tid_tx
->dialog_token
) {
773 #ifdef CONFIG_MAC80211_HT_DEBUG
774 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
779 del_timer_sync(&tid_tx
->addba_resp_timer
);
781 #ifdef CONFIG_MAC80211_HT_DEBUG
782 printk(KERN_DEBUG
"switched off addBA timer for tid %d\n", tid
);
786 * addba_resp_timer may have fired before we got here, and
787 * caused WANT_STOP to be set. If the stop then was already
788 * processed further, STOPPING might be set.
790 if (test_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
) ||
791 test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
792 #ifdef CONFIG_MAC80211_HT_DEBUG
794 "got addBA resp for tid %d but we already gave up\n",
801 * IEEE 802.11-2007 7.3.1.14:
802 * In an ADDBA Response frame, when the Status Code field
803 * is set to 0, the Buffer Size subfield is set to a value
806 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
807 == WLAN_STATUS_SUCCESS
&& buf_size
) {
808 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
810 /* ignore duplicate response */
814 tid_tx
->buf_size
= buf_size
;
816 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
817 ieee80211_agg_tx_operational(local
, sta
, tid
);
819 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
821 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
,
826 mutex_unlock(&sta
->ampdu_mlme
.mtx
);