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
);
86 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
87 memcpy(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
89 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
90 IEEE80211_STYPE_ACTION
);
92 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
94 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
95 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
97 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
98 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
99 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
100 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
102 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
104 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
105 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
106 cpu_to_le16(start_seq_num
<< 4);
108 ieee80211_tx_skb(sdata
, skb
);
111 void ieee80211_send_bar(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
, u16 ssn
)
113 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
114 struct ieee80211_local
*local
= sdata
->local
;
116 struct ieee80211_bar
*bar
;
119 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
123 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
124 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
125 memset(bar
, 0, sizeof(*bar
));
126 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
127 IEEE80211_STYPE_BACK_REQ
);
128 memcpy(bar
->ra
, ra
, ETH_ALEN
);
129 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
130 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
131 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
132 bar_control
|= (u16
)(tid
<< IEEE80211_BAR_CTRL_TID_INFO_SHIFT
);
133 bar
->control
= cpu_to_le16(bar_control
);
134 bar
->start_seq_num
= cpu_to_le16(ssn
);
136 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
137 ieee80211_tx_skb(sdata
, skb
);
139 EXPORT_SYMBOL(ieee80211_send_bar
);
141 void ieee80211_assign_tid_tx(struct sta_info
*sta
, int tid
,
142 struct tid_ampdu_tx
*tid_tx
)
144 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
145 lockdep_assert_held(&sta
->lock
);
146 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
149 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
150 enum ieee80211_back_parties initiator
,
153 struct ieee80211_local
*local
= sta
->local
;
154 struct tid_ampdu_tx
*tid_tx
;
157 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
159 spin_lock_bh(&sta
->lock
);
161 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
163 spin_unlock_bh(&sta
->lock
);
167 /* if we're already stopping ignore any new requests to stop */
168 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
169 spin_unlock_bh(&sta
->lock
);
173 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
174 /* not even started yet! */
175 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
176 spin_unlock_bh(&sta
->lock
);
177 kfree_rcu(tid_tx
, rcu_head
);
181 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
183 spin_unlock_bh(&sta
->lock
);
185 #ifdef CONFIG_MAC80211_HT_DEBUG
186 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
188 #endif /* CONFIG_MAC80211_HT_DEBUG */
190 del_timer_sync(&tid_tx
->addba_resp_timer
);
191 del_timer_sync(&tid_tx
->session_timer
);
194 * After this packets are no longer handed right through
195 * to the driver but are put onto tid_tx->pending instead,
196 * with locking to ensure proper access.
198 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
201 * There might be a few packets being processed right now (on
202 * another CPU) that have already gotten past the aggregation
203 * check when it was still OPERATIONAL and consequently have
204 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
205 * call into the driver at the same time or even before the
206 * TX paths calls into it, which could confuse the driver.
208 * Wait for all currently running TX paths to finish before
209 * telling the driver. New packets will not go through since
210 * the aggregation session is no longer OPERATIONAL.
214 tid_tx
->stop_initiator
= initiator
;
215 tid_tx
->tx_stop
= tx
;
217 ret
= drv_ampdu_action(local
, sta
->sdata
,
218 IEEE80211_AMPDU_TX_STOP
,
219 &sta
->sta
, tid
, NULL
, 0);
221 /* HW shall not deny going back to legacy */
224 * We may have pending packets get stuck in this case...
225 * Not bothering with a workaround for now.
233 * After sending add Block Ack request we activated a timer until
234 * add Block Ack response will arrive from the recipient.
235 * If this timer expires sta_addba_resp_timer_expired will be executed.
237 static void sta_addba_resp_timer_expired(unsigned long data
)
239 /* not an elegant detour, but there is no choice as the timer passes
240 * only one argument, and both sta_info and TID are needed, so init
241 * flow in sta_info_create gives the TID as data, while the timer_to_id
242 * array gives the sta through container_of */
243 u16 tid
= *(u8
*)data
;
244 struct sta_info
*sta
= container_of((void *)data
,
245 struct sta_info
, timer_to_tid
[tid
]);
246 struct tid_ampdu_tx
*tid_tx
;
248 /* check if the TID waits for addBA response */
250 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
252 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
254 #ifdef CONFIG_MAC80211_HT_DEBUG
255 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
256 "(or no longer) expecting addBA response there\n",
262 #ifdef CONFIG_MAC80211_HT_DEBUG
263 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
266 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
270 static inline int ieee80211_ac_from_tid(int tid
)
272 return ieee802_1d_to_ac
[tid
& 7];
276 * When multiple aggregation sessions on multiple stations
277 * are being created/destroyed simultaneously, we need to
278 * refcount the global queue stop caused by that in order
279 * to not get into a situation where one of the aggregation
280 * setup or teardown re-enables queues before the other is
281 * ready to handle that.
283 * These two functions take care of this issue by keeping
284 * a global "agg_queue_stop" refcount.
286 static void __acquires(agg_queue
)
287 ieee80211_stop_queue_agg(struct ieee80211_local
*local
, int tid
)
289 int queue
= ieee80211_ac_from_tid(tid
);
291 if (atomic_inc_return(&local
->agg_queue_stop
[queue
]) == 1)
292 ieee80211_stop_queue_by_reason(
294 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
295 __acquire(agg_queue
);
298 static void __releases(agg_queue
)
299 ieee80211_wake_queue_agg(struct ieee80211_local
*local
, int tid
)
301 int queue
= ieee80211_ac_from_tid(tid
);
303 if (atomic_dec_return(&local
->agg_queue_stop
[queue
]) == 0)
304 ieee80211_wake_queue_by_reason(
306 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
307 __release(agg_queue
);
310 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
312 struct tid_ampdu_tx
*tid_tx
;
313 struct ieee80211_local
*local
= sta
->local
;
314 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
318 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
321 * While we're asking the driver about the aggregation,
322 * stop the AC queue so that we don't have to worry
323 * about frames that came in while we were doing that,
324 * which would require us to put them to the AC pending
325 * afterwards which just makes the code more complex.
327 ieee80211_stop_queue_agg(local
, tid
);
329 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
332 * make sure no packets are being processed to get
333 * valid starting sequence number
337 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
339 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
340 &sta
->sta
, tid
, &start_seq_num
, 0);
342 #ifdef CONFIG_MAC80211_HT_DEBUG
343 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
346 spin_lock_bh(&sta
->lock
);
347 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
348 spin_unlock_bh(&sta
->lock
);
350 ieee80211_wake_queue_agg(local
, tid
);
351 kfree_rcu(tid_tx
, rcu_head
);
355 /* we can take packets again now */
356 ieee80211_wake_queue_agg(local
, tid
);
358 /* activate the timer for the recipient's addBA response */
359 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
360 #ifdef CONFIG_MAC80211_HT_DEBUG
361 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
364 spin_lock_bh(&sta
->lock
);
365 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
366 spin_unlock_bh(&sta
->lock
);
368 /* send AddBA request */
369 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
370 tid_tx
->dialog_token
, start_seq_num
,
371 local
->hw
.max_tx_aggregation_subframes
,
376 * After accepting the AddBA Response we activated a timer,
377 * resetting it after each frame that we send.
379 static void sta_tx_agg_session_timer_expired(unsigned long data
)
381 /* not an elegant detour, but there is no choice as the timer passes
382 * only one argument, and various sta_info are needed here, so init
383 * flow in sta_info_create gives the TID as data, while the timer_to_id
384 * array gives the sta through container_of */
385 u8
*ptid
= (u8
*)data
;
386 u8
*timer_to_id
= ptid
- *ptid
;
387 struct sta_info
*sta
= container_of(timer_to_id
, struct sta_info
,
390 #ifdef CONFIG_MAC80211_HT_DEBUG
391 printk(KERN_DEBUG
"tx session timer expired on tid %d\n", (u16
)*ptid
);
394 ieee80211_stop_tx_ba_session(&sta
->sta
, *ptid
);
397 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
400 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
401 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
402 struct ieee80211_local
*local
= sdata
->local
;
403 struct tid_ampdu_tx
*tid_tx
;
406 trace_api_start_tx_ba_session(pubsta
, tid
);
408 if (WARN_ON(!local
->ops
->ampdu_action
))
411 if ((tid
>= STA_TID_NUM
) ||
412 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
413 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
416 #ifdef CONFIG_MAC80211_HT_DEBUG
417 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
419 #endif /* CONFIG_MAC80211_HT_DEBUG */
421 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
422 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
423 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
424 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
425 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
428 if (test_sta_flag(sta
, WLAN_STA_BLOCK_BA
)) {
429 #ifdef CONFIG_MAC80211_HT_DEBUG
430 printk(KERN_DEBUG
"BA sessions blocked. "
431 "Denying BA session request\n");
437 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
438 * member of an IBSS, and has no other existing Block Ack agreement
439 * with the recipient STA, then the initiating STA shall transmit a
440 * Probe Request frame to the recipient STA and shall not transmit an
441 * ADDBA Request frame unless it receives a Probe Response frame
442 * from the recipient within dot11ADDBAFailureTimeout.
444 * The probe request mechanism for ADDBA is currently not implemented,
445 * but we only build up Block Ack session with HT STAs. This information
446 * is set when we receive a bss info from a probe response or a beacon.
448 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
449 !sta
->sta
.ht_cap
.ht_supported
) {
450 #ifdef CONFIG_MAC80211_HT_DEBUG
451 printk(KERN_DEBUG
"BA request denied - IBSS STA %pM"
452 "does not advertise HT support\n", pubsta
->addr
);
453 #endif /* CONFIG_MAC80211_HT_DEBUG */
457 spin_lock_bh(&sta
->lock
);
459 /* we have tried too many times, receiver does not want A-MPDU */
460 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
465 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
466 /* check if the TID is not in aggregation flow already */
467 if (tid_tx
|| sta
->ampdu_mlme
.tid_start_tx
[tid
]) {
468 #ifdef CONFIG_MAC80211_HT_DEBUG
469 printk(KERN_DEBUG
"BA request denied - session is not "
470 "idle on tid %u\n", tid
);
471 #endif /* CONFIG_MAC80211_HT_DEBUG */
476 /* prepare A-MPDU MLME for Tx aggregation */
477 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
483 skb_queue_head_init(&tid_tx
->pending
);
484 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
486 tid_tx
->timeout
= timeout
;
489 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
490 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
491 init_timer(&tid_tx
->addba_resp_timer
);
494 tid_tx
->session_timer
.function
= sta_tx_agg_session_timer_expired
;
495 tid_tx
->session_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
496 init_timer(&tid_tx
->session_timer
);
498 /* assign a dialog token */
499 sta
->ampdu_mlme
.dialog_token_allocator
++;
500 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
503 * Finally, assign it to the start array; the work item will
504 * collect it and move it to the normal array.
506 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
508 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
510 /* this flow continues off the work */
512 spin_unlock_bh(&sta
->lock
);
515 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
518 * splice packets from the STA's pending to the local pending,
519 * requires a call to ieee80211_agg_splice_finish later
521 static void __acquires(agg_queue
)
522 ieee80211_agg_splice_packets(struct ieee80211_local
*local
,
523 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
525 int queue
= ieee80211_ac_from_tid(tid
);
528 ieee80211_stop_queue_agg(local
, tid
);
530 if (WARN(!tid_tx
, "TID %d gone but expected when splicing aggregates"
531 " from the pending queue\n", tid
))
534 if (!skb_queue_empty(&tid_tx
->pending
)) {
535 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
536 /* copy over remaining packets */
537 skb_queue_splice_tail_init(&tid_tx
->pending
,
538 &local
->pending
[queue
]);
539 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
543 static void __releases(agg_queue
)
544 ieee80211_agg_splice_finish(struct ieee80211_local
*local
, u16 tid
)
546 ieee80211_wake_queue_agg(local
, tid
);
549 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
550 struct sta_info
*sta
, u16 tid
)
552 struct tid_ampdu_tx
*tid_tx
;
554 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
556 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
558 #ifdef CONFIG_MAC80211_HT_DEBUG
559 printk(KERN_DEBUG
"Aggregation is on for tid %d\n", tid
);
562 drv_ampdu_action(local
, sta
->sdata
,
563 IEEE80211_AMPDU_TX_OPERATIONAL
,
564 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
567 * synchronize with TX path, while splicing the TX path
568 * should block so it won't put more packets onto pending.
570 spin_lock_bh(&sta
->lock
);
572 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
574 * Now mark as operational. This will be visible
575 * in the TX path, and lets it go lock-free in
578 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
579 ieee80211_agg_splice_finish(local
, tid
);
581 spin_unlock_bh(&sta
->lock
);
584 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
586 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
587 struct ieee80211_local
*local
= sdata
->local
;
588 struct sta_info
*sta
;
589 struct tid_ampdu_tx
*tid_tx
;
591 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
593 if (tid
>= STA_TID_NUM
) {
594 #ifdef CONFIG_MAC80211_HT_DEBUG
595 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
601 mutex_lock(&local
->sta_mtx
);
602 sta
= sta_info_get_bss(sdata
, ra
);
604 mutex_unlock(&local
->sta_mtx
);
605 #ifdef CONFIG_MAC80211_HT_DEBUG
606 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
611 mutex_lock(&sta
->ampdu_mlme
.mtx
);
612 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
614 if (WARN_ON(!tid_tx
)) {
615 #ifdef CONFIG_MAC80211_HT_DEBUG
616 printk(KERN_DEBUG
"addBA was not requested!\n");
621 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
624 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
625 ieee80211_agg_tx_operational(local
, sta
, tid
);
628 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
629 mutex_unlock(&local
->sta_mtx
);
632 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
633 const u8
*ra
, u16 tid
)
635 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
636 struct ieee80211_local
*local
= sdata
->local
;
637 struct ieee80211_ra_tid
*ra_tid
;
638 struct sk_buff
*skb
= dev_alloc_skb(0);
643 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
644 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
647 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
648 skb_queue_tail(&sdata
->skb_queue
, skb
);
649 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
651 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
653 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
654 enum ieee80211_back_parties initiator
,
659 mutex_lock(&sta
->ampdu_mlme
.mtx
);
661 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
663 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
668 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
670 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
671 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
672 struct ieee80211_local
*local
= sdata
->local
;
673 struct tid_ampdu_tx
*tid_tx
;
676 trace_api_stop_tx_ba_session(pubsta
, tid
);
678 if (!local
->ops
->ampdu_action
)
681 if (tid
>= STA_TID_NUM
)
684 spin_lock_bh(&sta
->lock
);
685 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
692 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
693 /* already in progress stopping it */
698 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
699 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
702 spin_unlock_bh(&sta
->lock
);
705 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
707 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
709 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
710 struct ieee80211_local
*local
= sdata
->local
;
711 struct sta_info
*sta
;
712 struct tid_ampdu_tx
*tid_tx
;
714 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
716 if (tid
>= STA_TID_NUM
) {
717 #ifdef CONFIG_MAC80211_HT_DEBUG
718 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
724 #ifdef CONFIG_MAC80211_HT_DEBUG
725 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
727 #endif /* CONFIG_MAC80211_HT_DEBUG */
729 mutex_lock(&local
->sta_mtx
);
731 sta
= sta_info_get_bss(sdata
, ra
);
733 #ifdef CONFIG_MAC80211_HT_DEBUG
734 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
739 mutex_lock(&sta
->ampdu_mlme
.mtx
);
740 spin_lock_bh(&sta
->lock
);
741 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
743 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
744 #ifdef CONFIG_MAC80211_HT_DEBUG
745 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
750 if (tid_tx
->stop_initiator
== WLAN_BACK_INITIATOR
&& tid_tx
->tx_stop
)
751 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
752 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
755 * When we get here, the TX path will not be lockless any more wrt.
756 * aggregation, since the OPERATIONAL bit has long been cleared.
757 * Thus it will block on getting the lock, if it occurs. So if we
758 * stop the queue now, we will not get any more packets, and any
759 * that might be being processed will wait for us here, thereby
760 * guaranteeing that no packets go to the tid_tx pending queue any
764 ieee80211_agg_splice_packets(local
, tid_tx
, tid
);
766 /* future packets must not find the tid_tx struct any more */
767 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
769 ieee80211_agg_splice_finish(local
, tid
);
771 kfree_rcu(tid_tx
, rcu_head
);
774 spin_unlock_bh(&sta
->lock
);
775 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
777 mutex_unlock(&local
->sta_mtx
);
780 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
781 const u8
*ra
, u16 tid
)
783 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
784 struct ieee80211_local
*local
= sdata
->local
;
785 struct ieee80211_ra_tid
*ra_tid
;
786 struct sk_buff
*skb
= dev_alloc_skb(0);
791 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
792 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
795 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_STOP
;
796 skb_queue_tail(&sdata
->skb_queue
, skb
);
797 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
799 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
802 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
803 struct sta_info
*sta
,
804 struct ieee80211_mgmt
*mgmt
,
807 struct tid_ampdu_tx
*tid_tx
;
811 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
812 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
813 buf_size
= (capab
& IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK
) >> 6;
815 mutex_lock(&sta
->ampdu_mlme
.mtx
);
817 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
821 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!= tid_tx
->dialog_token
) {
822 #ifdef CONFIG_MAC80211_HT_DEBUG
823 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
828 del_timer_sync(&tid_tx
->addba_resp_timer
);
830 #ifdef CONFIG_MAC80211_HT_DEBUG
831 printk(KERN_DEBUG
"switched off addBA timer for tid %d\n", tid
);
835 * addba_resp_timer may have fired before we got here, and
836 * caused WANT_STOP to be set. If the stop then was already
837 * processed further, STOPPING might be set.
839 if (test_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
) ||
840 test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
841 #ifdef CONFIG_MAC80211_HT_DEBUG
843 "got addBA resp for tid %d but we already gave up\n",
850 * IEEE 802.11-2007 7.3.1.14:
851 * In an ADDBA Response frame, when the Status Code field
852 * is set to 0, the Buffer Size subfield is set to a value
855 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
856 == WLAN_STATUS_SUCCESS
&& buf_size
) {
857 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
859 /* ignore duplicate response */
863 tid_tx
->buf_size
= buf_size
;
865 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
866 ieee80211_agg_tx_operational(local
, sta
, tid
);
868 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
871 mod_timer(&tid_tx
->session_timer
,
872 TU_TO_EXP_TIME(tid_tx
->timeout
));
875 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
,
880 mutex_unlock(&sta
->ampdu_mlme
.mtx
);