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 <linux/slab.h>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
20 #include "driver-ops.h"
26 * Aggregation on the TX side requires setting the hardware flag
27 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
28 * hardware parameter to the number of hardware AMPDU queues. If there are no
29 * hardware queues then the driver will (currently) have to do all frame
32 * When TX aggregation is started by some subsystem (usually the rate control
33 * algorithm would be appropriate) by calling the
34 * ieee80211_start_tx_ba_session() function, the driver will be notified via
35 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
37 * In response to that, the driver is later required to call the
38 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
39 * function, which will start the aggregation session.
41 * Similarly, when the aggregation session is stopped by
42 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
43 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
44 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
45 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
48 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data
*sdata
,
49 const u8
*da
, u16 tid
,
50 u8 dialog_token
, u16 start_seq_num
,
51 u16 agg_size
, u16 timeout
)
53 struct ieee80211_local
*local
= sdata
->local
;
55 struct ieee80211_mgmt
*mgmt
;
58 skb
= dev_alloc_skb(sizeof(*mgmt
) + local
->hw
.extra_tx_headroom
);
61 printk(KERN_ERR
"%s: failed to allocate buffer "
62 "for addba request frame\n", sdata
->name
);
65 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
66 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
68 memcpy(mgmt
->da
, da
, ETH_ALEN
);
69 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
70 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
71 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
72 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
73 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
74 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
76 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
77 IEEE80211_STYPE_ACTION
);
79 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
81 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
82 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
84 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
85 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
86 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
87 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
89 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
91 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
92 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
93 cpu_to_le16(start_seq_num
<< 4);
95 ieee80211_tx_skb(sdata
, skb
);
98 void ieee80211_send_bar(struct ieee80211_sub_if_data
*sdata
, u8
*ra
, u16 tid
, u16 ssn
)
100 struct ieee80211_local
*local
= sdata
->local
;
102 struct ieee80211_bar
*bar
;
105 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
107 printk(KERN_ERR
"%s: failed to allocate buffer for "
108 "bar frame\n", sdata
->name
);
111 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
112 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
113 memset(bar
, 0, sizeof(*bar
));
114 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
115 IEEE80211_STYPE_BACK_REQ
);
116 memcpy(bar
->ra
, ra
, ETH_ALEN
);
117 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
118 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
119 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
120 bar_control
|= (u16
)(tid
<< 12);
121 bar
->control
= cpu_to_le16(bar_control
);
122 bar
->start_seq_num
= cpu_to_le16(ssn
);
124 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
125 ieee80211_tx_skb(sdata
, skb
);
128 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
129 enum ieee80211_back_parties initiator
)
131 struct ieee80211_local
*local
= sta
->local
;
135 #ifdef CONFIG_MAC80211_HT_DEBUG
136 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
138 #endif /* CONFIG_MAC80211_HT_DEBUG */
140 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
142 if (*state
== HT_AGG_STATE_OPERATIONAL
)
143 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
145 *state
= HT_AGG_STATE_REQ_STOP_BA_MSK
|
146 (initiator
<< HT_AGG_STATE_INITIATOR_SHIFT
);
148 ret
= drv_ampdu_action(local
, sta
->sdata
,
149 IEEE80211_AMPDU_TX_STOP
,
150 &sta
->sta
, tid
, NULL
);
152 /* HW shall not deny going back to legacy */
155 * We may have pending packets get stuck in this case...
156 * Not bothering with a workaround for now.
164 * After sending add Block Ack request we activated a timer until
165 * add Block Ack response will arrive from the recipient.
166 * If this timer expires sta_addba_resp_timer_expired will be executed.
168 static void sta_addba_resp_timer_expired(unsigned long data
)
170 /* not an elegant detour, but there is no choice as the timer passes
171 * only one argument, and both sta_info and TID are needed, so init
172 * flow in sta_info_create gives the TID as data, while the timer_to_id
173 * array gives the sta through container_of */
174 u16 tid
= *(u8
*)data
;
175 struct sta_info
*sta
= container_of((void *)data
,
176 struct sta_info
, timer_to_tid
[tid
]);
179 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
181 /* check if the TID waits for addBA response */
182 spin_lock_bh(&sta
->lock
);
183 if ((*state
& (HT_ADDBA_REQUESTED_MSK
| HT_ADDBA_RECEIVED_MSK
|
184 HT_AGG_STATE_REQ_STOP_BA_MSK
)) !=
185 HT_ADDBA_REQUESTED_MSK
) {
186 spin_unlock_bh(&sta
->lock
);
187 *state
= HT_AGG_STATE_IDLE
;
188 #ifdef CONFIG_MAC80211_HT_DEBUG
189 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
190 "(or no longer) expecting addBA response there",
196 #ifdef CONFIG_MAC80211_HT_DEBUG
197 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
200 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
);
201 spin_unlock_bh(&sta
->lock
);
204 static inline int ieee80211_ac_from_tid(int tid
)
206 return ieee802_1d_to_ac
[tid
& 7];
209 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
211 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
212 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
213 struct ieee80211_local
*local
= sdata
->local
;
218 if (WARN_ON(!local
->ops
->ampdu_action
))
221 if ((tid
>= STA_TID_NUM
) ||
222 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
))
225 #ifdef CONFIG_MAC80211_HT_DEBUG
226 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
228 #endif /* CONFIG_MAC80211_HT_DEBUG */
231 * The aggregation code is not prepared to handle
232 * anything but STA/AP due to the BSSID handling.
233 * IBSS could work in the code but isn't supported
234 * by drivers or the standard.
236 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
237 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
238 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
241 if (test_sta_flags(sta
, WLAN_STA_DISASSOC
)) {
242 #ifdef CONFIG_MAC80211_HT_DEBUG
243 printk(KERN_DEBUG
"Disassociation is in progress. "
244 "Denying BA session request\n");
249 if (test_sta_flags(sta
, WLAN_STA_SUSPEND
)) {
250 #ifdef CONFIG_MAC80211_HT_DEBUG
251 printk(KERN_DEBUG
"Suspend in progress. "
252 "Denying BA session request\n");
257 spin_lock_bh(&sta
->lock
);
258 spin_lock(&local
->ampdu_lock
);
260 /* we have tried too many times, receiver does not want A-MPDU */
261 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
266 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
267 /* check if the TID is not in aggregation flow already */
268 if (*state
!= HT_AGG_STATE_IDLE
) {
269 #ifdef CONFIG_MAC80211_HT_DEBUG
270 printk(KERN_DEBUG
"BA request denied - session is not "
271 "idle on tid %u\n", tid
);
272 #endif /* CONFIG_MAC80211_HT_DEBUG */
278 * While we're asking the driver about the aggregation,
279 * stop the AC queue so that we don't have to worry
280 * about frames that came in while we were doing that,
281 * which would require us to put them to the AC pending
282 * afterwards which just makes the code more complex.
284 ieee80211_stop_queue_by_reason(
285 &local
->hw
, ieee80211_ac_from_tid(tid
),
286 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
288 /* prepare A-MPDU MLME for Tx aggregation */
289 sta
->ampdu_mlme
.tid_tx
[tid
] =
290 kmalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
291 if (!sta
->ampdu_mlme
.tid_tx
[tid
]) {
292 #ifdef CONFIG_MAC80211_HT_DEBUG
294 printk(KERN_ERR
"allocate tx mlme to tid %d failed\n",
301 skb_queue_head_init(&sta
->ampdu_mlme
.tid_tx
[tid
]->pending
);
304 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.function
=
305 sta_addba_resp_timer_expired
;
306 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.data
=
307 (unsigned long)&sta
->timer_to_tid
[tid
];
308 init_timer(&sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
);
310 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
311 * call back right away, it must see that the flow has begun */
312 *state
|= HT_ADDBA_REQUESTED_MSK
;
314 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
316 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
317 pubsta
, tid
, &start_seq_num
);
320 #ifdef CONFIG_MAC80211_HT_DEBUG
321 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
323 #endif /* CONFIG_MAC80211_HT_DEBUG */
324 *state
= HT_AGG_STATE_IDLE
;
328 /* Driver vetoed or OKed, but we can take packets again now */
329 ieee80211_wake_queue_by_reason(
330 &local
->hw
, ieee80211_ac_from_tid(tid
),
331 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
333 spin_unlock(&local
->ampdu_lock
);
334 spin_unlock_bh(&sta
->lock
);
336 /* send an addBA request */
337 sta
->ampdu_mlme
.dialog_token_allocator
++;
338 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
=
339 sta
->ampdu_mlme
.dialog_token_allocator
;
340 sta
->ampdu_mlme
.tid_tx
[tid
]->ssn
= start_seq_num
;
342 ieee80211_send_addba_request(sdata
, pubsta
->addr
, tid
,
343 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
,
344 sta
->ampdu_mlme
.tid_tx
[tid
]->ssn
,
346 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
347 /* activate the timer for the recipient's addBA response */
348 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.expires
=
349 jiffies
+ ADDBA_RESP_INTERVAL
;
350 add_timer(&sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
);
351 #ifdef CONFIG_MAC80211_HT_DEBUG
352 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
357 kfree(sta
->ampdu_mlme
.tid_tx
[tid
]);
358 sta
->ampdu_mlme
.tid_tx
[tid
] = NULL
;
360 ieee80211_wake_queue_by_reason(
361 &local
->hw
, ieee80211_ac_from_tid(tid
),
362 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
364 spin_unlock(&local
->ampdu_lock
);
365 spin_unlock_bh(&sta
->lock
);
368 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
371 * splice packets from the STA's pending to the local pending,
372 * requires a call to ieee80211_agg_splice_finish and holding
373 * local->ampdu_lock across both calls.
375 static void ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
376 struct sta_info
*sta
, u16 tid
)
379 u16 queue
= ieee80211_ac_from_tid(tid
);
381 ieee80211_stop_queue_by_reason(
383 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
385 if (!(sta
->ampdu_mlme
.tid_state_tx
[tid
] & HT_ADDBA_REQUESTED_MSK
))
388 if (WARN(!sta
->ampdu_mlme
.tid_tx
[tid
],
389 "TID %d gone but expected when splicing aggregates from"
390 "the pending queue\n", tid
))
393 if (!skb_queue_empty(&sta
->ampdu_mlme
.tid_tx
[tid
]->pending
)) {
394 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
395 /* copy over remaining packets */
396 skb_queue_splice_tail_init(
397 &sta
->ampdu_mlme
.tid_tx
[tid
]->pending
,
398 &local
->pending
[queue
]);
399 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
403 static void ieee80211_agg_splice_finish(struct ieee80211_local
*local
,
404 struct sta_info
*sta
, u16 tid
)
406 u16 queue
= ieee80211_ac_from_tid(tid
);
408 ieee80211_wake_queue_by_reason(
410 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
413 /* caller must hold sta->lock */
414 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
415 struct sta_info
*sta
, u16 tid
)
417 #ifdef CONFIG_MAC80211_HT_DEBUG
418 printk(KERN_DEBUG
"Aggregation is on for tid %d \n", tid
);
421 spin_lock(&local
->ampdu_lock
);
422 ieee80211_agg_splice_packets(local
, sta
, tid
);
424 * NB: we rely on sta->lock being taken in the TX
425 * processing here when adding to the pending queue,
426 * otherwise we could only change the state of the
427 * session to OPERATIONAL _here_.
429 ieee80211_agg_splice_finish(local
, sta
, tid
);
430 spin_unlock(&local
->ampdu_lock
);
432 drv_ampdu_action(local
, sta
->sdata
,
433 IEEE80211_AMPDU_TX_OPERATIONAL
,
434 &sta
->sta
, tid
, NULL
);
437 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
439 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
440 struct ieee80211_local
*local
= sdata
->local
;
441 struct sta_info
*sta
;
444 if (tid
>= STA_TID_NUM
) {
445 #ifdef CONFIG_MAC80211_HT_DEBUG
446 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
453 sta
= sta_info_get(sdata
, ra
);
456 #ifdef CONFIG_MAC80211_HT_DEBUG
457 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
462 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
463 spin_lock_bh(&sta
->lock
);
465 if (WARN_ON(!(*state
& HT_ADDBA_REQUESTED_MSK
))) {
466 #ifdef CONFIG_MAC80211_HT_DEBUG
467 printk(KERN_DEBUG
"addBA was not requested yet, state is %d\n",
470 spin_unlock_bh(&sta
->lock
);
475 if (WARN_ON(*state
& HT_ADDBA_DRV_READY_MSK
))
478 *state
|= HT_ADDBA_DRV_READY_MSK
;
480 if (*state
== HT_AGG_STATE_OPERATIONAL
)
481 ieee80211_agg_tx_operational(local
, sta
, tid
);
484 spin_unlock_bh(&sta
->lock
);
487 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb
);
489 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
490 const u8
*ra
, u16 tid
)
492 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
493 struct ieee80211_local
*local
= sdata
->local
;
494 struct ieee80211_ra_tid
*ra_tid
;
495 struct sk_buff
*skb
= dev_alloc_skb(0);
497 if (unlikely(!skb
)) {
498 #ifdef CONFIG_MAC80211_HT_DEBUG
500 printk(KERN_WARNING
"%s: Not enough memory, "
501 "dropping start BA session", sdata
->name
);
505 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
506 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
510 skb
->pkt_type
= IEEE80211_ADDBA_MSG
;
511 skb_queue_tail(&local
->skb_queue
, skb
);
512 tasklet_schedule(&local
->tasklet
);
514 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
516 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
517 enum ieee80211_back_parties initiator
)
522 /* check if the TID is in aggregation */
523 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
524 spin_lock_bh(&sta
->lock
);
526 if (*state
!= HT_AGG_STATE_OPERATIONAL
) {
531 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
);
534 spin_unlock_bh(&sta
->lock
);
538 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
539 enum ieee80211_back_parties initiator
)
541 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
542 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
543 struct ieee80211_local
*local
= sdata
->local
;
545 if (!local
->ops
->ampdu_action
)
548 if (tid
>= STA_TID_NUM
)
551 return __ieee80211_stop_tx_ba_session(sta
, tid
, initiator
);
553 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
555 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
557 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
558 struct ieee80211_local
*local
= sdata
->local
;
559 struct sta_info
*sta
;
562 if (tid
>= STA_TID_NUM
) {
563 #ifdef CONFIG_MAC80211_HT_DEBUG
564 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
570 #ifdef CONFIG_MAC80211_HT_DEBUG
571 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
573 #endif /* CONFIG_MAC80211_HT_DEBUG */
576 sta
= sta_info_get(sdata
, ra
);
578 #ifdef CONFIG_MAC80211_HT_DEBUG
579 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
584 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
586 /* NOTE: no need to use sta->lock in this state check, as
587 * ieee80211_stop_tx_ba_session will let only one stop call to
588 * pass through per sta/tid
590 if ((*state
& HT_AGG_STATE_REQ_STOP_BA_MSK
) == 0) {
591 #ifdef CONFIG_MAC80211_HT_DEBUG
592 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
598 if (*state
& HT_AGG_STATE_INITIATOR_MSK
)
599 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
600 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
602 spin_lock_bh(&sta
->lock
);
603 spin_lock(&local
->ampdu_lock
);
605 ieee80211_agg_splice_packets(local
, sta
, tid
);
607 *state
= HT_AGG_STATE_IDLE
;
608 /* from now on packets are no longer put onto sta->pending */
609 kfree(sta
->ampdu_mlme
.tid_tx
[tid
]);
610 sta
->ampdu_mlme
.tid_tx
[tid
] = NULL
;
612 ieee80211_agg_splice_finish(local
, sta
, tid
);
614 spin_unlock(&local
->ampdu_lock
);
615 spin_unlock_bh(&sta
->lock
);
619 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb
);
621 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
622 const u8
*ra
, u16 tid
)
624 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
625 struct ieee80211_local
*local
= sdata
->local
;
626 struct ieee80211_ra_tid
*ra_tid
;
627 struct sk_buff
*skb
= dev_alloc_skb(0);
629 if (unlikely(!skb
)) {
630 #ifdef CONFIG_MAC80211_HT_DEBUG
632 printk(KERN_WARNING
"%s: Not enough memory, "
633 "dropping stop BA session", sdata
->name
);
637 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
638 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
642 skb
->pkt_type
= IEEE80211_DELBA_MSG
;
643 skb_queue_tail(&local
->skb_queue
, skb
);
644 tasklet_schedule(&local
->tasklet
);
646 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
649 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
650 struct sta_info
*sta
,
651 struct ieee80211_mgmt
*mgmt
,
657 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
658 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
660 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
662 spin_lock_bh(&sta
->lock
);
664 if (!(*state
& HT_ADDBA_REQUESTED_MSK
))
667 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!=
668 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
) {
669 #ifdef CONFIG_MAC80211_HT_DEBUG
670 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
671 #endif /* CONFIG_MAC80211_HT_DEBUG */
675 del_timer(&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 */
681 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
682 == WLAN_STATUS_SUCCESS
) {
683 u8 curstate
= *state
;
685 *state
|= HT_ADDBA_RECEIVED_MSK
;
687 if (*state
!= curstate
&& *state
== HT_AGG_STATE_OPERATIONAL
)
688 ieee80211_agg_tx_operational(local
, sta
, tid
);
690 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
692 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
);
696 spin_unlock_bh(&sta
->lock
);