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 <linux/export.h>
19 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
21 #include "driver-ops.h"
25 * DOC: TX A-MPDU aggregation
27 * Aggregation on the TX side requires setting the hardware flag
28 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
29 * packets with a flag indicating A-MPDU aggregation. The driver
30 * or device is responsible for actually aggregating the frames,
31 * as well as deciding how many and which to aggregate.
33 * When TX aggregation is started by some subsystem (usually the rate
34 * control algorithm would be appropriate) by calling the
35 * ieee80211_start_tx_ba_session() function, the driver will be
36 * notified via its @ampdu_action function, with the
37 * %IEEE80211_AMPDU_TX_START action.
39 * In response to that, the driver is later required to call the
40 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
41 * start the aggregation session after the peer has also responded.
42 * If the peer responds negatively, the session will be stopped
43 * again right away. Note that it is possible for the aggregation
44 * session to be stopped before the driver has indicated that it
45 * is done setting it up, in which case it must not indicate the
48 * Also note that, since we also need to wait for a response from
49 * the peer, the driver is notified of the completion of the
50 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
51 * @ampdu_action callback.
53 * Similarly, when the aggregation session is stopped by the peer
54 * or something calling ieee80211_stop_tx_ba_session(), the driver's
55 * @ampdu_action function will be called with the action
56 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
57 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
60 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data
*sdata
,
61 const u8
*da
, u16 tid
,
62 u8 dialog_token
, u16 start_seq_num
,
63 u16 agg_size
, u16 timeout
)
65 struct ieee80211_local
*local
= sdata
->local
;
67 struct ieee80211_mgmt
*mgmt
;
70 skb
= dev_alloc_skb(sizeof(*mgmt
) + local
->hw
.extra_tx_headroom
);
75 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
76 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
78 memcpy(mgmt
->da
, da
, ETH_ALEN
);
79 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
80 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
81 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
82 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
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_vif
*vif
, u8
*ra
, u16 tid
, u16 ssn
)
111 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
112 struct ieee80211_local
*local
= sdata
->local
;
114 struct ieee80211_bar
*bar
;
117 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
121 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
122 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
123 memset(bar
, 0, sizeof(*bar
));
124 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
125 IEEE80211_STYPE_BACK_REQ
);
126 memcpy(bar
->ra
, ra
, ETH_ALEN
);
127 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
128 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
129 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
130 bar_control
|= (u16
)(tid
<< IEEE80211_BAR_CTRL_TID_INFO_SHIFT
);
131 bar
->control
= cpu_to_le16(bar_control
);
132 bar
->start_seq_num
= cpu_to_le16(ssn
);
134 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
135 ieee80211_tx_skb(sdata
, skb
);
137 EXPORT_SYMBOL(ieee80211_send_bar
);
139 void ieee80211_assign_tid_tx(struct sta_info
*sta
, int tid
,
140 struct tid_ampdu_tx
*tid_tx
)
142 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
143 lockdep_assert_held(&sta
->lock
);
144 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
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
;
155 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
157 spin_lock_bh(&sta
->lock
);
159 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
161 spin_unlock_bh(&sta
->lock
);
165 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
166 /* not even started yet! */
167 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
168 spin_unlock_bh(&sta
->lock
);
169 kfree_rcu(tid_tx
, rcu_head
);
173 spin_unlock_bh(&sta
->lock
);
175 #ifdef CONFIG_MAC80211_HT_DEBUG
176 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
178 #endif /* CONFIG_MAC80211_HT_DEBUG */
180 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
182 del_timer_sync(&tid_tx
->addba_resp_timer
);
183 del_timer_sync(&tid_tx
->session_timer
);
186 * After this packets are no longer handed right through
187 * to the driver but are put onto tid_tx->pending instead,
188 * with locking to ensure proper access.
190 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
192 tid_tx
->stop_initiator
= initiator
;
193 tid_tx
->tx_stop
= tx
;
195 ret
= drv_ampdu_action(local
, sta
->sdata
,
196 IEEE80211_AMPDU_TX_STOP
,
197 &sta
->sta
, tid
, NULL
, 0);
199 /* HW shall not deny going back to legacy */
202 * We may have pending packets get stuck in this case...
203 * Not bothering with a workaround for now.
211 * After sending add Block Ack request we activated a timer until
212 * add Block Ack response will arrive from the recipient.
213 * If this timer expires sta_addba_resp_timer_expired will be executed.
215 static void sta_addba_resp_timer_expired(unsigned long data
)
217 /* not an elegant detour, but there is no choice as the timer passes
218 * only one argument, and both sta_info and TID are needed, so init
219 * flow in sta_info_create gives the TID as data, while the timer_to_id
220 * array gives the sta through container_of */
221 u16 tid
= *(u8
*)data
;
222 struct sta_info
*sta
= container_of((void *)data
,
223 struct sta_info
, timer_to_tid
[tid
]);
224 struct tid_ampdu_tx
*tid_tx
;
226 /* check if the TID waits for addBA response */
228 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
230 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
232 #ifdef CONFIG_MAC80211_HT_DEBUG
233 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
234 "(or no longer) expecting addBA response there\n",
240 #ifdef CONFIG_MAC80211_HT_DEBUG
241 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
244 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
248 static inline int ieee80211_ac_from_tid(int tid
)
250 return ieee802_1d_to_ac
[tid
& 7];
254 * When multiple aggregation sessions on multiple stations
255 * are being created/destroyed simultaneously, we need to
256 * refcount the global queue stop caused by that in order
257 * to not get into a situation where one of the aggregation
258 * setup or teardown re-enables queues before the other is
259 * ready to handle that.
261 * These two functions take care of this issue by keeping
262 * a global "agg_queue_stop" refcount.
264 static void __acquires(agg_queue
)
265 ieee80211_stop_queue_agg(struct ieee80211_local
*local
, int tid
)
267 int queue
= ieee80211_ac_from_tid(tid
);
269 if (atomic_inc_return(&local
->agg_queue_stop
[queue
]) == 1)
270 ieee80211_stop_queue_by_reason(
272 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
273 __acquire(agg_queue
);
276 static void __releases(agg_queue
)
277 ieee80211_wake_queue_agg(struct ieee80211_local
*local
, int tid
)
279 int queue
= ieee80211_ac_from_tid(tid
);
281 if (atomic_dec_return(&local
->agg_queue_stop
[queue
]) == 0)
282 ieee80211_wake_queue_by_reason(
284 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
285 __release(agg_queue
);
288 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
290 struct tid_ampdu_tx
*tid_tx
;
291 struct ieee80211_local
*local
= sta
->local
;
292 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
296 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
299 * While we're asking the driver about the aggregation,
300 * stop the AC queue so that we don't have to worry
301 * about frames that came in while we were doing that,
302 * which would require us to put them to the AC pending
303 * afterwards which just makes the code more complex.
305 ieee80211_stop_queue_agg(local
, tid
);
307 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
310 * make sure no packets are being processed to get
311 * valid starting sequence number
315 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
317 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
318 &sta
->sta
, tid
, &start_seq_num
, 0);
320 #ifdef CONFIG_MAC80211_HT_DEBUG
321 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
324 spin_lock_bh(&sta
->lock
);
325 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
326 spin_unlock_bh(&sta
->lock
);
328 ieee80211_wake_queue_agg(local
, tid
);
329 kfree_rcu(tid_tx
, rcu_head
);
333 /* we can take packets again now */
334 ieee80211_wake_queue_agg(local
, tid
);
336 /* activate the timer for the recipient's addBA response */
337 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
338 #ifdef CONFIG_MAC80211_HT_DEBUG
339 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
342 spin_lock_bh(&sta
->lock
);
343 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
344 spin_unlock_bh(&sta
->lock
);
346 /* send AddBA request */
347 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
348 tid_tx
->dialog_token
, start_seq_num
,
349 local
->hw
.max_tx_aggregation_subframes
,
354 * After accepting the AddBA Response we activated a timer,
355 * resetting it after each frame that we send.
357 static void sta_tx_agg_session_timer_expired(unsigned long data
)
359 /* not an elegant detour, but there is no choice as the timer passes
360 * only one argument, and various sta_info are needed here, so init
361 * flow in sta_info_create gives the TID as data, while the timer_to_id
362 * array gives the sta through container_of */
363 u8
*ptid
= (u8
*)data
;
364 u8
*timer_to_id
= ptid
- *ptid
;
365 struct sta_info
*sta
= container_of(timer_to_id
, struct sta_info
,
368 #ifdef CONFIG_MAC80211_HT_DEBUG
369 printk(KERN_DEBUG
"tx session timer expired on tid %d\n", (u16
)*ptid
);
372 ieee80211_stop_tx_ba_session(&sta
->sta
, *ptid
);
375 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
378 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
379 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
380 struct ieee80211_local
*local
= sdata
->local
;
381 struct tid_ampdu_tx
*tid_tx
;
384 trace_api_start_tx_ba_session(pubsta
, tid
);
386 if (WARN_ON(!local
->ops
->ampdu_action
))
389 if ((tid
>= STA_TID_NUM
) ||
390 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
391 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
394 #ifdef CONFIG_MAC80211_HT_DEBUG
395 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
397 #endif /* CONFIG_MAC80211_HT_DEBUG */
399 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
400 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
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
);
450 tid_tx
->session_timer
.function
= sta_tx_agg_session_timer_expired
;
451 tid_tx
->session_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
452 init_timer(&tid_tx
->session_timer
);
454 /* assign a dialog token */
455 sta
->ampdu_mlme
.dialog_token_allocator
++;
456 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
459 * Finally, assign it to the start array; the work item will
460 * collect it and move it to the normal array.
462 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
464 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
466 /* this flow continues off the work */
468 spin_unlock_bh(&sta
->lock
);
471 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
474 * splice packets from the STA's pending to the local pending,
475 * requires a call to ieee80211_agg_splice_finish later
477 static void __acquires(agg_queue
)
478 ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
479 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
481 int queue
= ieee80211_ac_from_tid(tid
);
484 ieee80211_stop_queue_agg(local
, tid
);
486 if (WARN(!tid_tx
, "TID %d gone but expected when splicing aggregates"
487 " from the pending queue\n", tid
))
490 if (!skb_queue_empty(&tid_tx
->pending
)) {
491 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
492 /* copy over remaining packets */
493 skb_queue_splice_tail_init(&tid_tx
->pending
,
494 &local
->pending
[queue
]);
495 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
499 static void __releases(agg_queue
)
500 ieee80211_agg_splice_finish(struct ieee80211_local
*local
, u16 tid
)
502 ieee80211_wake_queue_agg(local
, tid
);
505 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
506 struct sta_info
*sta
, u16 tid
)
508 struct tid_ampdu_tx
*tid_tx
;
510 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
512 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
514 #ifdef CONFIG_MAC80211_HT_DEBUG
515 printk(KERN_DEBUG
"Aggregation is on for tid %d\n", tid
);
518 drv_ampdu_action(local
, sta
->sdata
,
519 IEEE80211_AMPDU_TX_OPERATIONAL
,
520 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
523 * synchronize with TX path, while splicing the TX path
524 * should block so it won't put more packets onto pending.
526 spin_lock_bh(&sta
->lock
);
528 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
530 * Now mark as operational. This will be visible
531 * in the TX path, and lets it go lock-free in
534 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
535 ieee80211_agg_splice_finish(local
, tid
);
537 spin_unlock_bh(&sta
->lock
);
540 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
542 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
543 struct ieee80211_local
*local
= sdata
->local
;
544 struct sta_info
*sta
;
545 struct tid_ampdu_tx
*tid_tx
;
547 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
549 if (tid
>= STA_TID_NUM
) {
550 #ifdef CONFIG_MAC80211_HT_DEBUG
551 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
557 mutex_lock(&local
->sta_mtx
);
558 sta
= sta_info_get_bss(sdata
, ra
);
560 mutex_unlock(&local
->sta_mtx
);
561 #ifdef CONFIG_MAC80211_HT_DEBUG
562 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
567 mutex_lock(&sta
->ampdu_mlme
.mtx
);
568 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
570 if (WARN_ON(!tid_tx
)) {
571 #ifdef CONFIG_MAC80211_HT_DEBUG
572 printk(KERN_DEBUG
"addBA was not requested!\n");
577 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
580 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
581 ieee80211_agg_tx_operational(local
, sta
, tid
);
584 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
585 mutex_unlock(&local
->sta_mtx
);
588 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
589 const u8
*ra
, u16 tid
)
591 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
592 struct ieee80211_local
*local
= sdata
->local
;
593 struct ieee80211_ra_tid
*ra_tid
;
594 struct sk_buff
*skb
= dev_alloc_skb(0);
599 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
600 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
603 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
604 skb_queue_tail(&sdata
->skb_queue
, skb
);
605 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
607 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
609 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
610 enum ieee80211_back_parties initiator
,
615 mutex_lock(&sta
->ampdu_mlme
.mtx
);
617 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
619 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
624 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
626 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
627 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
628 struct ieee80211_local
*local
= sdata
->local
;
629 struct tid_ampdu_tx
*tid_tx
;
632 trace_api_stop_tx_ba_session(pubsta
, tid
);
634 if (!local
->ops
->ampdu_action
)
637 if (tid
>= STA_TID_NUM
)
640 spin_lock_bh(&sta
->lock
);
641 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
648 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
649 /* already in progress stopping it */
654 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
655 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
658 spin_unlock_bh(&sta
->lock
);
661 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
663 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
665 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
666 struct ieee80211_local
*local
= sdata
->local
;
667 struct sta_info
*sta
;
668 struct tid_ampdu_tx
*tid_tx
;
670 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
672 if (tid
>= STA_TID_NUM
) {
673 #ifdef CONFIG_MAC80211_HT_DEBUG
674 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
680 #ifdef CONFIG_MAC80211_HT_DEBUG
681 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
683 #endif /* CONFIG_MAC80211_HT_DEBUG */
685 mutex_lock(&local
->sta_mtx
);
687 sta
= sta_info_get_bss(sdata
, ra
);
689 #ifdef CONFIG_MAC80211_HT_DEBUG
690 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
695 mutex_lock(&sta
->ampdu_mlme
.mtx
);
696 spin_lock_bh(&sta
->lock
);
697 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
699 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
700 #ifdef CONFIG_MAC80211_HT_DEBUG
701 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
706 if (tid_tx
->stop_initiator
== WLAN_BACK_INITIATOR
&& tid_tx
->tx_stop
)
707 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
708 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
711 * When we get here, the TX path will not be lockless any more wrt.
712 * aggregation, since the OPERATIONAL bit has long been cleared.
713 * Thus it will block on getting the lock, if it occurs. So if we
714 * stop the queue now, we will not get any more packets, and any
715 * that might be being processed will wait for us here, thereby
716 * guaranteeing that no packets go to the tid_tx pending queue any
720 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
722 /* future packets must not find the tid_tx struct any more */
723 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
725 ieee80211_agg_splice_finish(local
, tid
);
727 kfree_rcu(tid_tx
, rcu_head
);
730 spin_unlock_bh(&sta
->lock
);
731 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
733 mutex_unlock(&local
->sta_mtx
);
736 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
737 const u8
*ra
, u16 tid
)
739 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
740 struct ieee80211_local
*local
= sdata
->local
;
741 struct ieee80211_ra_tid
*ra_tid
;
742 struct sk_buff
*skb
= dev_alloc_skb(0);
747 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
748 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
751 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_STOP
;
752 skb_queue_tail(&sdata
->skb_queue
, skb
);
753 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
755 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
758 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
759 struct sta_info
*sta
,
760 struct ieee80211_mgmt
*mgmt
,
763 struct tid_ampdu_tx
*tid_tx
;
767 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
768 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
769 buf_size
= (capab
& IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK
) >> 6;
771 mutex_lock(&sta
->ampdu_mlme
.mtx
);
773 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
777 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!= tid_tx
->dialog_token
) {
778 #ifdef CONFIG_MAC80211_HT_DEBUG
779 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
784 del_timer(&tid_tx
->addba_resp_timer
);
786 #ifdef CONFIG_MAC80211_HT_DEBUG
787 printk(KERN_DEBUG
"switched off addBA timer for tid %d\n", tid
);
790 * IEEE 802.11-2007 7.3.1.14:
791 * In an ADDBA Response frame, when the Status Code field
792 * is set to 0, the Buffer Size subfield is set to a value
795 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
796 == WLAN_STATUS_SUCCESS
&& buf_size
) {
797 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
799 /* ignore duplicate response */
803 tid_tx
->buf_size
= buf_size
;
805 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
806 ieee80211_agg_tx_operational(local
, sta
, tid
);
808 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
811 mod_timer(&tid_tx
->session_timer
,
812 TU_TO_EXP_TIME(tid_tx
->timeout
));
815 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
,
820 mutex_unlock(&sta
->ampdu_mlme
.mtx
);