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 <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "driver-ops.h"
25 * Aggregation on the TX side requires setting the hardware flag
26 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
27 * hardware parameter to the number of hardware AMPDU queues. If there are no
28 * hardware queues then the driver will (currently) have to do all frame
31 * When TX aggregation is started by some subsystem (usually the rate control
32 * algorithm would be appropriate) by calling the
33 * ieee80211_start_tx_ba_session() function, the driver will be notified via
34 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
36 * In response to that, the driver is later required to call the
37 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
38 * function, which will start the aggregation session.
40 * Similarly, when the aggregation session is stopped by
41 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
42 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
43 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
44 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
47 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data
*sdata
,
48 const u8
*da
, u16 tid
,
49 u8 dialog_token
, u16 start_seq_num
,
50 u16 agg_size
, u16 timeout
)
52 struct ieee80211_local
*local
= sdata
->local
;
54 struct ieee80211_mgmt
*mgmt
;
57 skb
= dev_alloc_skb(sizeof(*mgmt
) + local
->hw
.extra_tx_headroom
);
60 printk(KERN_ERR
"%s: failed to allocate buffer "
61 "for addba request frame\n", sdata
->name
);
64 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
65 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
67 memcpy(mgmt
->da
, da
, ETH_ALEN
);
68 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
69 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
70 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
71 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
72 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
73 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
75 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
76 IEEE80211_STYPE_ACTION
);
78 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
80 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
81 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
83 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
84 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
85 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
86 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
88 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
90 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
91 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
92 cpu_to_le16(start_seq_num
<< 4);
94 ieee80211_tx_skb(sdata
, skb
);
97 void ieee80211_send_bar(struct ieee80211_sub_if_data
*sdata
, u8
*ra
, u16 tid
, u16 ssn
)
99 struct ieee80211_local
*local
= sdata
->local
;
101 struct ieee80211_bar
*bar
;
104 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
106 printk(KERN_ERR
"%s: failed to allocate buffer for "
107 "bar frame\n", sdata
->name
);
110 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
111 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
112 memset(bar
, 0, sizeof(*bar
));
113 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
114 IEEE80211_STYPE_BACK_REQ
);
115 memcpy(bar
->ra
, ra
, ETH_ALEN
);
116 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
117 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
118 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
119 bar_control
|= (u16
)(tid
<< 12);
120 bar
->control
= cpu_to_le16(bar_control
);
121 bar
->start_seq_num
= cpu_to_le16(ssn
);
123 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
124 ieee80211_tx_skb(sdata
, skb
);
127 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
128 enum ieee80211_back_parties initiator
)
130 struct ieee80211_local
*local
= sta
->local
;
134 #ifdef CONFIG_MAC80211_HT_DEBUG
135 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
137 #endif /* CONFIG_MAC80211_HT_DEBUG */
139 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
141 if (*state
== HT_AGG_STATE_OPERATIONAL
)
142 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
144 *state
= HT_AGG_STATE_REQ_STOP_BA_MSK
|
145 (initiator
<< HT_AGG_STATE_INITIATOR_SHIFT
);
147 ret
= drv_ampdu_action(local
, sta
->sdata
,
148 IEEE80211_AMPDU_TX_STOP
,
149 &sta
->sta
, tid
, NULL
);
151 /* HW shall not deny going back to legacy */
154 * We may have pending packets get stuck in this case...
155 * Not bothering with a workaround for now.
163 * After sending add Block Ack request we activated a timer until
164 * add Block Ack response will arrive from the recipient.
165 * If this timer expires sta_addba_resp_timer_expired will be executed.
167 static void sta_addba_resp_timer_expired(unsigned long data
)
169 /* not an elegant detour, but there is no choice as the timer passes
170 * only one argument, and both sta_info and TID are needed, so init
171 * flow in sta_info_create gives the TID as data, while the timer_to_id
172 * array gives the sta through container_of */
173 u16 tid
= *(u8
*)data
;
174 struct sta_info
*sta
= container_of((void *)data
,
175 struct sta_info
, timer_to_tid
[tid
]);
178 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
180 /* check if the TID waits for addBA response */
181 spin_lock_bh(&sta
->lock
);
182 if ((*state
& (HT_ADDBA_REQUESTED_MSK
| HT_ADDBA_RECEIVED_MSK
)) !=
183 HT_ADDBA_REQUESTED_MSK
) {
184 spin_unlock_bh(&sta
->lock
);
185 *state
= HT_AGG_STATE_IDLE
;
186 #ifdef CONFIG_MAC80211_HT_DEBUG
187 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
188 "(or no longer) expecting addBA response there",
194 #ifdef CONFIG_MAC80211_HT_DEBUG
195 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
198 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
);
199 spin_unlock_bh(&sta
->lock
);
202 static inline int ieee80211_ac_from_tid(int tid
)
204 return ieee802_1d_to_ac
[tid
& 7];
207 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
209 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
210 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
211 struct ieee80211_local
*local
= sdata
->local
;
216 if (WARN_ON(!local
->ops
->ampdu_action
))
219 if ((tid
>= STA_TID_NUM
) ||
220 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
))
223 #ifdef CONFIG_MAC80211_HT_DEBUG
224 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
226 #endif /* CONFIG_MAC80211_HT_DEBUG */
229 * The aggregation code is not prepared to handle
230 * anything but STA/AP due to the BSSID handling.
231 * IBSS could work in the code but isn't supported
232 * by drivers or the standard.
234 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
235 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
236 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
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");
247 spin_lock_bh(&sta
->lock
);
248 spin_lock(&local
->ampdu_lock
);
250 /* we have tried too many times, receiver does not want A-MPDU */
251 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
256 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
257 /* check if the TID is not in aggregation flow already */
258 if (*state
!= HT_AGG_STATE_IDLE
) {
259 #ifdef CONFIG_MAC80211_HT_DEBUG
260 printk(KERN_DEBUG
"BA request denied - session is not "
261 "idle on tid %u\n", tid
);
262 #endif /* CONFIG_MAC80211_HT_DEBUG */
268 * While we're asking the driver about the aggregation,
269 * stop the AC queue so that we don't have to worry
270 * about frames that came in while we were doing that,
271 * which would require us to put them to the AC pending
272 * afterwards which just makes the code more complex.
274 ieee80211_stop_queue_by_reason(
275 &local
->hw
, ieee80211_ac_from_tid(tid
),
276 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
278 /* prepare A-MPDU MLME for Tx aggregation */
279 sta
->ampdu_mlme
.tid_tx
[tid
] =
280 kmalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
281 if (!sta
->ampdu_mlme
.tid_tx
[tid
]) {
282 #ifdef CONFIG_MAC80211_HT_DEBUG
284 printk(KERN_ERR
"allocate tx mlme to tid %d failed\n",
291 skb_queue_head_init(&sta
->ampdu_mlme
.tid_tx
[tid
]->pending
);
294 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.function
=
295 sta_addba_resp_timer_expired
;
296 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.data
=
297 (unsigned long)&sta
->timer_to_tid
[tid
];
298 init_timer(&sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
);
300 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
301 * call back right away, it must see that the flow has begun */
302 *state
|= HT_ADDBA_REQUESTED_MSK
;
304 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
306 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
307 pubsta
, tid
, &start_seq_num
);
310 #ifdef CONFIG_MAC80211_HT_DEBUG
311 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
313 #endif /* CONFIG_MAC80211_HT_DEBUG */
314 *state
= HT_AGG_STATE_IDLE
;
318 /* Driver vetoed or OKed, but we can take packets again now */
319 ieee80211_wake_queue_by_reason(
320 &local
->hw
, ieee80211_ac_from_tid(tid
),
321 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
323 spin_unlock(&local
->ampdu_lock
);
324 spin_unlock_bh(&sta
->lock
);
326 /* send an addBA request */
327 sta
->ampdu_mlme
.dialog_token_allocator
++;
328 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
=
329 sta
->ampdu_mlme
.dialog_token_allocator
;
330 sta
->ampdu_mlme
.tid_tx
[tid
]->ssn
= start_seq_num
;
332 ieee80211_send_addba_request(sdata
, pubsta
->addr
, tid
,
333 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
,
334 sta
->ampdu_mlme
.tid_tx
[tid
]->ssn
,
336 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
337 /* activate the timer for the recipient's addBA response */
338 sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
.expires
=
339 jiffies
+ ADDBA_RESP_INTERVAL
;
340 add_timer(&sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
);
341 #ifdef CONFIG_MAC80211_HT_DEBUG
342 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
347 kfree(sta
->ampdu_mlme
.tid_tx
[tid
]);
348 sta
->ampdu_mlme
.tid_tx
[tid
] = NULL
;
350 ieee80211_wake_queue_by_reason(
351 &local
->hw
, ieee80211_ac_from_tid(tid
),
352 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
354 spin_unlock(&local
->ampdu_lock
);
355 spin_unlock_bh(&sta
->lock
);
358 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
361 * splice packets from the STA's pending to the local pending,
362 * requires a call to ieee80211_agg_splice_finish and holding
363 * local->ampdu_lock across both calls.
365 static void ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
366 struct sta_info
*sta
, u16 tid
)
369 u16 queue
= ieee80211_ac_from_tid(tid
);
371 ieee80211_stop_queue_by_reason(
373 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
375 if (!(sta
->ampdu_mlme
.tid_state_tx
[tid
] & HT_ADDBA_REQUESTED_MSK
))
378 if (WARN(!sta
->ampdu_mlme
.tid_tx
[tid
],
379 "TID %d gone but expected when splicing aggregates from"
380 "the pending queue\n", tid
))
383 if (!skb_queue_empty(&sta
->ampdu_mlme
.tid_tx
[tid
]->pending
)) {
384 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
385 /* copy over remaining packets */
386 skb_queue_splice_tail_init(
387 &sta
->ampdu_mlme
.tid_tx
[tid
]->pending
,
388 &local
->pending
[queue
]);
389 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
393 static void ieee80211_agg_splice_finish(struct ieee80211_local
*local
,
394 struct sta_info
*sta
, u16 tid
)
396 u16 queue
= ieee80211_ac_from_tid(tid
);
398 ieee80211_wake_queue_by_reason(
400 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
403 /* caller must hold sta->lock */
404 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
405 struct sta_info
*sta
, u16 tid
)
407 #ifdef CONFIG_MAC80211_HT_DEBUG
408 printk(KERN_DEBUG
"Aggregation is on for tid %d \n", tid
);
411 spin_lock(&local
->ampdu_lock
);
412 ieee80211_agg_splice_packets(local
, sta
, tid
);
414 * NB: we rely on sta->lock being taken in the TX
415 * processing here when adding to the pending queue,
416 * otherwise we could only change the state of the
417 * session to OPERATIONAL _here_.
419 ieee80211_agg_splice_finish(local
, sta
, tid
);
420 spin_unlock(&local
->ampdu_lock
);
422 drv_ampdu_action(local
, sta
->sdata
,
423 IEEE80211_AMPDU_TX_OPERATIONAL
,
424 &sta
->sta
, tid
, NULL
);
427 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
429 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
430 struct ieee80211_local
*local
= sdata
->local
;
431 struct sta_info
*sta
;
434 if (tid
>= STA_TID_NUM
) {
435 #ifdef CONFIG_MAC80211_HT_DEBUG
436 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
443 sta
= sta_info_get(sdata
, ra
);
446 #ifdef CONFIG_MAC80211_HT_DEBUG
447 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
452 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
453 spin_lock_bh(&sta
->lock
);
455 if (WARN_ON(!(*state
& HT_ADDBA_REQUESTED_MSK
))) {
456 #ifdef CONFIG_MAC80211_HT_DEBUG
457 printk(KERN_DEBUG
"addBA was not requested yet, state is %d\n",
460 spin_unlock_bh(&sta
->lock
);
465 if (WARN_ON(*state
& HT_ADDBA_DRV_READY_MSK
))
468 *state
|= HT_ADDBA_DRV_READY_MSK
;
470 if (*state
== HT_AGG_STATE_OPERATIONAL
)
471 ieee80211_agg_tx_operational(local
, sta
, tid
);
474 spin_unlock_bh(&sta
->lock
);
477 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb
);
479 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
480 const u8
*ra
, u16 tid
)
482 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
483 struct ieee80211_local
*local
= sdata
->local
;
484 struct ieee80211_ra_tid
*ra_tid
;
485 struct sk_buff
*skb
= dev_alloc_skb(0);
487 if (unlikely(!skb
)) {
488 #ifdef CONFIG_MAC80211_HT_DEBUG
490 printk(KERN_WARNING
"%s: Not enough memory, "
491 "dropping start BA session", sdata
->name
);
495 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
496 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
500 skb
->pkt_type
= IEEE80211_ADDBA_MSG
;
501 skb_queue_tail(&local
->skb_queue
, skb
);
502 tasklet_schedule(&local
->tasklet
);
504 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
506 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
507 enum ieee80211_back_parties initiator
)
512 /* check if the TID is in aggregation */
513 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
514 spin_lock_bh(&sta
->lock
);
516 if (*state
!= HT_AGG_STATE_OPERATIONAL
) {
521 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
);
524 spin_unlock_bh(&sta
->lock
);
528 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
529 enum ieee80211_back_parties initiator
)
531 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
532 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
533 struct ieee80211_local
*local
= sdata
->local
;
535 if (!local
->ops
->ampdu_action
)
538 if (tid
>= STA_TID_NUM
)
541 return __ieee80211_stop_tx_ba_session(sta
, tid
, initiator
);
543 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
545 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
547 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
548 struct ieee80211_local
*local
= sdata
->local
;
549 struct sta_info
*sta
;
552 if (tid
>= STA_TID_NUM
) {
553 #ifdef CONFIG_MAC80211_HT_DEBUG
554 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
560 #ifdef CONFIG_MAC80211_HT_DEBUG
561 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
563 #endif /* CONFIG_MAC80211_HT_DEBUG */
566 sta
= sta_info_get(sdata
, ra
);
568 #ifdef CONFIG_MAC80211_HT_DEBUG
569 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
574 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
576 /* NOTE: no need to use sta->lock in this state check, as
577 * ieee80211_stop_tx_ba_session will let only one stop call to
578 * pass through per sta/tid
580 if ((*state
& HT_AGG_STATE_REQ_STOP_BA_MSK
) == 0) {
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
588 if (*state
& HT_AGG_STATE_INITIATOR_MSK
)
589 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
590 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
592 spin_lock_bh(&sta
->lock
);
593 spin_lock(&local
->ampdu_lock
);
595 ieee80211_agg_splice_packets(local
, sta
, tid
);
597 *state
= HT_AGG_STATE_IDLE
;
598 /* from now on packets are no longer put onto sta->pending */
599 kfree(sta
->ampdu_mlme
.tid_tx
[tid
]);
600 sta
->ampdu_mlme
.tid_tx
[tid
] = NULL
;
602 ieee80211_agg_splice_finish(local
, sta
, tid
);
604 spin_unlock(&local
->ampdu_lock
);
605 spin_unlock_bh(&sta
->lock
);
609 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb
);
611 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
612 const u8
*ra
, u16 tid
)
614 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
615 struct ieee80211_local
*local
= sdata
->local
;
616 struct ieee80211_ra_tid
*ra_tid
;
617 struct sk_buff
*skb
= dev_alloc_skb(0);
619 if (unlikely(!skb
)) {
620 #ifdef CONFIG_MAC80211_HT_DEBUG
622 printk(KERN_WARNING
"%s: Not enough memory, "
623 "dropping stop BA session", sdata
->name
);
627 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
628 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
632 skb
->pkt_type
= IEEE80211_DELBA_MSG
;
633 skb_queue_tail(&local
->skb_queue
, skb
);
634 tasklet_schedule(&local
->tasklet
);
636 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
639 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
640 struct sta_info
*sta
,
641 struct ieee80211_mgmt
*mgmt
,
647 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
648 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
650 state
= &sta
->ampdu_mlme
.tid_state_tx
[tid
];
652 spin_lock_bh(&sta
->lock
);
654 if (!(*state
& HT_ADDBA_REQUESTED_MSK
))
657 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!=
658 sta
->ampdu_mlme
.tid_tx
[tid
]->dialog_token
) {
659 #ifdef CONFIG_MAC80211_HT_DEBUG
660 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
661 #endif /* CONFIG_MAC80211_HT_DEBUG */
665 del_timer(&sta
->ampdu_mlme
.tid_tx
[tid
]->addba_resp_timer
);
667 #ifdef CONFIG_MAC80211_HT_DEBUG
668 printk(KERN_DEBUG
"switched off addBA timer for tid %d \n", tid
);
669 #endif /* CONFIG_MAC80211_HT_DEBUG */
671 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
672 == WLAN_STATUS_SUCCESS
) {
673 u8 curstate
= *state
;
675 *state
|= HT_ADDBA_RECEIVED_MSK
;
677 if (*state
!= curstate
&& *state
== HT_AGG_STATE_OPERATIONAL
)
678 ieee80211_agg_tx_operational(local
, sta
, tid
);
680 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
682 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
);
686 spin_unlock_bh(&sta
->lock
);