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
);
72 printk(KERN_ERR
"%s: failed to allocate buffer "
73 "for addba request frame\n", sdata
->name
);
76 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
77 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
79 memcpy(mgmt
->da
, da
, ETH_ALEN
);
80 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
81 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
82 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
83 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
84 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
85 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
87 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
88 IEEE80211_STYPE_ACTION
);
90 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
92 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
93 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
95 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
96 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
97 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
98 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
100 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
102 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
103 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
104 cpu_to_le16(start_seq_num
<< 4);
106 ieee80211_tx_skb(sdata
, skb
);
109 void ieee80211_send_bar(struct ieee80211_sub_if_data
*sdata
, u8
*ra
, u16 tid
, u16 ssn
)
111 struct ieee80211_local
*local
= sdata
->local
;
113 struct ieee80211_bar
*bar
;
116 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
118 printk(KERN_ERR
"%s: failed to allocate buffer for "
119 "bar frame\n", sdata
->name
);
122 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
123 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
124 memset(bar
, 0, sizeof(*bar
));
125 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
126 IEEE80211_STYPE_BACK_REQ
);
127 memcpy(bar
->ra
, ra
, ETH_ALEN
);
128 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
129 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
130 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
131 bar_control
|= (u16
)(tid
<< 12);
132 bar
->control
= cpu_to_le16(bar_control
);
133 bar
->start_seq_num
= cpu_to_le16(ssn
);
135 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
136 ieee80211_tx_skb(sdata
, skb
);
139 static void kfree_tid_tx(struct rcu_head
*rcu_head
)
141 struct tid_ampdu_tx
*tid_tx
=
142 container_of(rcu_head
, struct tid_ampdu_tx
, rcu_head
);
147 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
148 enum ieee80211_back_parties initiator
,
151 struct ieee80211_local
*local
= sta
->local
;
152 struct tid_ampdu_tx
*tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
155 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
160 spin_lock_bh(&sta
->lock
);
162 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
163 /* not even started yet! */
164 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], NULL
);
165 spin_unlock_bh(&sta
->lock
);
166 call_rcu(&tid_tx
->rcu_head
, kfree_tid_tx
);
170 spin_unlock_bh(&sta
->lock
);
172 #ifdef CONFIG_MAC80211_HT_DEBUG
173 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
175 #endif /* CONFIG_MAC80211_HT_DEBUG */
177 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
179 del_timer_sync(&tid_tx
->addba_resp_timer
);
182 * After this packets are no longer handed right through
183 * to the driver but are put onto tid_tx->pending instead,
184 * with locking to ensure proper access.
186 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
188 tid_tx
->stop_initiator
= initiator
;
189 tid_tx
->tx_stop
= tx
;
191 ret
= drv_ampdu_action(local
, sta
->sdata
,
192 IEEE80211_AMPDU_TX_STOP
,
193 &sta
->sta
, tid
, NULL
);
195 /* HW shall not deny going back to legacy */
198 * We may have pending packets get stuck in this case...
199 * Not bothering with a workaround for now.
207 * After sending add Block Ack request we activated a timer until
208 * add Block Ack response will arrive from the recipient.
209 * If this timer expires sta_addba_resp_timer_expired will be executed.
211 static void sta_addba_resp_timer_expired(unsigned long data
)
213 /* not an elegant detour, but there is no choice as the timer passes
214 * only one argument, and both sta_info and TID are needed, so init
215 * flow in sta_info_create gives the TID as data, while the timer_to_id
216 * array gives the sta through container_of */
217 u16 tid
= *(u8
*)data
;
218 struct sta_info
*sta
= container_of((void *)data
,
219 struct sta_info
, timer_to_tid
[tid
]);
220 struct tid_ampdu_tx
*tid_tx
;
222 /* check if the TID waits for addBA response */
224 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
226 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
228 #ifdef CONFIG_MAC80211_HT_DEBUG
229 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
230 "(or no longer) expecting addBA response there\n",
236 #ifdef CONFIG_MAC80211_HT_DEBUG
237 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
240 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
244 static inline int ieee80211_ac_from_tid(int tid
)
246 return ieee802_1d_to_ac
[tid
& 7];
250 * When multiple aggregation sessions on multiple stations
251 * are being created/destroyed simultaneously, we need to
252 * refcount the global queue stop caused by that in order
253 * to not get into a situation where one of the aggregation
254 * setup or teardown re-enables queues before the other is
255 * ready to handle that.
257 * These two functions take care of this issue by keeping
258 * a global "agg_queue_stop" refcount.
260 static void __acquires(agg_queue
)
261 ieee80211_stop_queue_agg(struct ieee80211_local
*local
, int tid
)
263 int queue
= ieee80211_ac_from_tid(tid
);
265 if (atomic_inc_return(&local
->agg_queue_stop
[queue
]) == 1)
266 ieee80211_stop_queue_by_reason(
268 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
269 __acquire(agg_queue
);
272 static void __releases(agg_queue
)
273 ieee80211_wake_queue_agg(struct ieee80211_local
*local
, int tid
)
275 int queue
= ieee80211_ac_from_tid(tid
);
277 if (atomic_dec_return(&local
->agg_queue_stop
[queue
]) == 0)
278 ieee80211_wake_queue_by_reason(
280 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
281 __release(agg_queue
);
284 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
286 struct tid_ampdu_tx
*tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
287 struct ieee80211_local
*local
= sta
->local
;
288 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
292 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
295 * While we're asking the driver about the aggregation,
296 * stop the AC queue so that we don't have to worry
297 * about frames that came in while we were doing that,
298 * which would require us to put them to the AC pending
299 * afterwards which just makes the code more complex.
301 ieee80211_stop_queue_agg(local
, tid
);
303 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
306 * make sure no packets are being processed to get
307 * valid starting sequence number
311 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
313 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
314 &sta
->sta
, tid
, &start_seq_num
);
316 #ifdef CONFIG_MAC80211_HT_DEBUG
317 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
320 spin_lock_bh(&sta
->lock
);
321 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], NULL
);
322 spin_unlock_bh(&sta
->lock
);
324 ieee80211_wake_queue_agg(local
, tid
);
325 call_rcu(&tid_tx
->rcu_head
, kfree_tid_tx
);
329 /* we can take packets again now */
330 ieee80211_wake_queue_agg(local
, tid
);
332 /* activate the timer for the recipient's addBA response */
333 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
334 #ifdef CONFIG_MAC80211_HT_DEBUG
335 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
338 spin_lock_bh(&sta
->lock
);
339 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
340 spin_unlock_bh(&sta
->lock
);
342 /* send AddBA request */
343 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
344 tid_tx
->dialog_token
, start_seq_num
,
348 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
350 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
351 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
352 struct ieee80211_local
*local
= sdata
->local
;
353 struct tid_ampdu_tx
*tid_tx
;
356 trace_api_start_tx_ba_session(pubsta
, tid
);
358 if (WARN_ON(!local
->ops
->ampdu_action
))
361 if ((tid
>= STA_TID_NUM
) ||
362 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
))
365 #ifdef CONFIG_MAC80211_HT_DEBUG
366 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
368 #endif /* CONFIG_MAC80211_HT_DEBUG */
371 * The aggregation code is not prepared to handle
372 * anything but STA/AP due to the BSSID handling.
373 * IBSS could work in the code but isn't supported
374 * by drivers or the standard.
376 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
377 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
378 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
381 if (test_sta_flags(sta
, WLAN_STA_BLOCK_BA
)) {
382 #ifdef CONFIG_MAC80211_HT_DEBUG
383 printk(KERN_DEBUG
"BA sessions blocked. "
384 "Denying BA session request\n");
389 spin_lock_bh(&sta
->lock
);
391 /* we have tried too many times, receiver does not want A-MPDU */
392 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
397 tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
398 /* check if the TID is not in aggregation flow already */
400 #ifdef CONFIG_MAC80211_HT_DEBUG
401 printk(KERN_DEBUG
"BA request denied - session is not "
402 "idle on tid %u\n", tid
);
403 #endif /* CONFIG_MAC80211_HT_DEBUG */
408 /* prepare A-MPDU MLME for Tx aggregation */
409 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
411 #ifdef CONFIG_MAC80211_HT_DEBUG
413 printk(KERN_ERR
"allocate tx mlme to tid %d failed\n",
420 skb_queue_head_init(&tid_tx
->pending
);
421 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
424 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
425 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
426 init_timer(&tid_tx
->addba_resp_timer
);
428 /* assign a dialog token */
429 sta
->ampdu_mlme
.dialog_token_allocator
++;
430 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
432 /* finally, assign it to the array */
433 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
435 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
437 /* this flow continues off the work */
439 spin_unlock_bh(&sta
->lock
);
442 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
445 * splice packets from the STA's pending to the local pending,
446 * requires a call to ieee80211_agg_splice_finish later
448 static void __acquires(agg_queue
)
449 ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
450 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
452 int queue
= ieee80211_ac_from_tid(tid
);
455 ieee80211_stop_queue_agg(local
, tid
);
457 if (WARN(!tid_tx
, "TID %d gone but expected when splicing aggregates"
458 " from the pending queue\n", tid
))
461 if (!skb_queue_empty(&tid_tx
->pending
)) {
462 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
463 /* copy over remaining packets */
464 skb_queue_splice_tail_init(&tid_tx
->pending
,
465 &local
->pending
[queue
]);
466 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
470 static void __releases(agg_queue
)
471 ieee80211_agg_splice_finish(struct ieee80211_local
*local
, u16 tid
)
473 ieee80211_wake_queue_agg(local
, tid
);
476 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
477 struct sta_info
*sta
, u16 tid
)
479 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
481 #ifdef CONFIG_MAC80211_HT_DEBUG
482 printk(KERN_DEBUG
"Aggregation is on for tid %d\n", tid
);
485 drv_ampdu_action(local
, sta
->sdata
,
486 IEEE80211_AMPDU_TX_OPERATIONAL
,
487 &sta
->sta
, tid
, NULL
);
490 * synchronize with TX path, while splicing the TX path
491 * should block so it won't put more packets onto pending.
493 spin_lock_bh(&sta
->lock
);
495 ieee80211_agg_splice_packets(local
, sta
->ampdu_mlme
.tid_tx
[tid
], tid
);
497 * Now mark as operational. This will be visible
498 * in the TX path, and lets it go lock-free in
501 set_bit(HT_AGG_STATE_OPERATIONAL
, &sta
->ampdu_mlme
.tid_tx
[tid
]->state
);
502 ieee80211_agg_splice_finish(local
, tid
);
504 spin_unlock_bh(&sta
->lock
);
507 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
509 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
510 struct ieee80211_local
*local
= sdata
->local
;
511 struct sta_info
*sta
;
512 struct tid_ampdu_tx
*tid_tx
;
514 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
516 if (tid
>= STA_TID_NUM
) {
517 #ifdef CONFIG_MAC80211_HT_DEBUG
518 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
524 mutex_lock(&local
->sta_mtx
);
525 sta
= sta_info_get(sdata
, ra
);
527 mutex_unlock(&local
->sta_mtx
);
528 #ifdef CONFIG_MAC80211_HT_DEBUG
529 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
534 mutex_lock(&sta
->ampdu_mlme
.mtx
);
535 tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
537 if (WARN_ON(!tid_tx
)) {
538 #ifdef CONFIG_MAC80211_HT_DEBUG
539 printk(KERN_DEBUG
"addBA was not requested!\n");
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 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
552 mutex_unlock(&local
->sta_mtx
);
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
,
587 mutex_lock(&sta
->ampdu_mlme
.mtx
);
589 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
591 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
596 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
598 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
599 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
600 struct ieee80211_local
*local
= sdata
->local
;
601 struct tid_ampdu_tx
*tid_tx
;
604 trace_api_stop_tx_ba_session(pubsta
, tid
);
606 if (!local
->ops
->ampdu_action
)
609 if (tid
>= STA_TID_NUM
)
612 spin_lock_bh(&sta
->lock
);
613 tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
620 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
621 /* already in progress stopping it */
626 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
627 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
630 spin_unlock_bh(&sta
->lock
);
633 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
635 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
637 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
638 struct ieee80211_local
*local
= sdata
->local
;
639 struct sta_info
*sta
;
640 struct tid_ampdu_tx
*tid_tx
;
642 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
644 if (tid
>= STA_TID_NUM
) {
645 #ifdef CONFIG_MAC80211_HT_DEBUG
646 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
652 #ifdef CONFIG_MAC80211_HT_DEBUG
653 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
655 #endif /* CONFIG_MAC80211_HT_DEBUG */
657 mutex_lock(&local
->sta_mtx
);
659 sta
= sta_info_get(sdata
, ra
);
661 #ifdef CONFIG_MAC80211_HT_DEBUG
662 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
667 mutex_lock(&sta
->ampdu_mlme
.mtx
);
668 spin_lock_bh(&sta
->lock
);
669 tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
671 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
672 #ifdef CONFIG_MAC80211_HT_DEBUG
673 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
678 if (tid_tx
->stop_initiator
== WLAN_BACK_INITIATOR
&& tid_tx
->tx_stop
)
679 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
680 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
683 * When we get here, the TX path will not be lockless any more wrt.
684 * aggregation, since the OPERATIONAL bit has long been cleared.
685 * Thus it will block on getting the lock, if it occurs. So if we
686 * stop the queue now, we will not get any more packets, and any
687 * that might be being processed will wait for us here, thereby
688 * guaranteeing that no packets go to the tid_tx pending queue any
692 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
694 /* future packets must not find the tid_tx struct any more */
695 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], NULL
);
697 ieee80211_agg_splice_finish(local
, tid
);
699 call_rcu(&tid_tx
->rcu_head
, kfree_tid_tx
);
702 spin_unlock_bh(&sta
->lock
);
703 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
705 mutex_unlock(&local
->sta_mtx
);
708 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
709 const u8
*ra
, u16 tid
)
711 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
712 struct ieee80211_local
*local
= sdata
->local
;
713 struct ieee80211_ra_tid
*ra_tid
;
714 struct sk_buff
*skb
= dev_alloc_skb(0);
716 if (unlikely(!skb
)) {
717 #ifdef CONFIG_MAC80211_HT_DEBUG
719 printk(KERN_WARNING
"%s: Not enough memory, "
720 "dropping stop BA session", sdata
->name
);
724 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
725 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
728 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_STOP
;
729 skb_queue_tail(&sdata
->skb_queue
, skb
);
730 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
732 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
735 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
736 struct sta_info
*sta
,
737 struct ieee80211_mgmt
*mgmt
,
740 struct tid_ampdu_tx
*tid_tx
;
743 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
744 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
746 mutex_lock(&sta
->ampdu_mlme
.mtx
);
748 tid_tx
= sta
->ampdu_mlme
.tid_tx
[tid
];
752 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!= tid_tx
->dialog_token
) {
753 #ifdef CONFIG_MAC80211_HT_DEBUG
754 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
759 del_timer(&tid_tx
->addba_resp_timer
);
761 #ifdef CONFIG_MAC80211_HT_DEBUG
762 printk(KERN_DEBUG
"switched off addBA timer for tid %d\n", tid
);
765 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
766 == WLAN_STATUS_SUCCESS
) {
767 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
769 /* ignore duplicate response */
773 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
774 ieee80211_agg_tx_operational(local
, sta
, tid
);
776 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
778 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
,
783 mutex_unlock(&sta
->ampdu_mlme
.mtx
);