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().
58 * Note that the sta can get destroyed before the BA tear down is
62 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data
*sdata
,
63 const u8
*da
, u16 tid
,
64 u8 dialog_token
, u16 start_seq_num
,
65 u16 agg_size
, u16 timeout
)
67 struct ieee80211_local
*local
= sdata
->local
;
69 struct ieee80211_mgmt
*mgmt
;
72 skb
= dev_alloc_skb(sizeof(*mgmt
) + local
->hw
.extra_tx_headroom
);
77 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
78 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
80 memcpy(mgmt
->da
, da
, ETH_ALEN
);
81 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
82 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
83 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
84 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
85 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
86 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
87 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
88 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
89 memcpy(mgmt
->bssid
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
91 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
92 IEEE80211_STYPE_ACTION
);
94 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.addba_req
));
96 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
97 mgmt
->u
.action
.u
.addba_req
.action_code
= WLAN_ACTION_ADDBA_REQ
;
99 mgmt
->u
.action
.u
.addba_req
.dialog_token
= dialog_token
;
100 capab
= (u16
)(1 << 1); /* bit 1 aggregation policy */
101 capab
|= (u16
)(tid
<< 2); /* bit 5:2 TID number */
102 capab
|= (u16
)(agg_size
<< 6); /* bit 15:6 max size of aggergation */
104 mgmt
->u
.action
.u
.addba_req
.capab
= cpu_to_le16(capab
);
106 mgmt
->u
.action
.u
.addba_req
.timeout
= cpu_to_le16(timeout
);
107 mgmt
->u
.action
.u
.addba_req
.start_seq_num
=
108 cpu_to_le16(start_seq_num
<< 4);
110 ieee80211_tx_skb_tid(sdata
, skb
, tid
);
113 void ieee80211_send_bar(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
, u16 ssn
)
115 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
116 struct ieee80211_local
*local
= sdata
->local
;
118 struct ieee80211_bar
*bar
;
121 skb
= dev_alloc_skb(sizeof(*bar
) + local
->hw
.extra_tx_headroom
);
125 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
126 bar
= (struct ieee80211_bar
*)skb_put(skb
, sizeof(*bar
));
127 memset(bar
, 0, sizeof(*bar
));
128 bar
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
129 IEEE80211_STYPE_BACK_REQ
);
130 memcpy(bar
->ra
, ra
, ETH_ALEN
);
131 memcpy(bar
->ta
, sdata
->vif
.addr
, ETH_ALEN
);
132 bar_control
|= (u16
)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL
;
133 bar_control
|= (u16
)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA
;
134 bar_control
|= (u16
)(tid
<< IEEE80211_BAR_CTRL_TID_INFO_SHIFT
);
135 bar
->control
= cpu_to_le16(bar_control
);
136 bar
->start_seq_num
= cpu_to_le16(ssn
);
138 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
139 IEEE80211_TX_CTL_REQ_TX_STATUS
;
140 ieee80211_tx_skb_tid(sdata
, skb
, tid
);
142 EXPORT_SYMBOL(ieee80211_send_bar
);
144 void ieee80211_assign_tid_tx(struct sta_info
*sta
, int tid
,
145 struct tid_ampdu_tx
*tid_tx
)
147 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
148 lockdep_assert_held(&sta
->lock
);
149 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
152 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
153 enum ieee80211_agg_stop_reason reason
)
155 struct ieee80211_local
*local
= sta
->local
;
156 struct tid_ampdu_tx
*tid_tx
;
159 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
161 spin_lock_bh(&sta
->lock
);
163 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
165 spin_unlock_bh(&sta
->lock
);
169 /* if we're already stopping ignore any new requests to stop */
170 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
171 spin_unlock_bh(&sta
->lock
);
175 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
176 /* not even started yet! */
177 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
178 spin_unlock_bh(&sta
->lock
);
179 kfree_rcu(tid_tx
, rcu_head
);
183 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
185 spin_unlock_bh(&sta
->lock
);
187 ht_dbg(sta
->sdata
, "Tx BA session stop requested for %pM tid %u\n",
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
= reason
== AGG_STOP_PEER_REQUEST
?
215 WLAN_BACK_RECIPIENT
:
217 tid_tx
->tx_stop
= reason
== AGG_STOP_LOCAL_REQUEST
;
219 ret
= drv_ampdu_action(local
, sta
->sdata
,
220 IEEE80211_AMPDU_TX_STOP
,
221 &sta
->sta
, tid
, NULL
, 0);
223 /* HW shall not deny going back to legacy */
226 * We may have pending packets get stuck in this case...
227 * Not bothering with a workaround for now.
235 * After sending add Block Ack request we activated a timer until
236 * add Block Ack response will arrive from the recipient.
237 * If this timer expires sta_addba_resp_timer_expired will be executed.
239 static void sta_addba_resp_timer_expired(unsigned long data
)
241 /* not an elegant detour, but there is no choice as the timer passes
242 * only one argument, and both sta_info and TID are needed, so init
243 * flow in sta_info_create gives the TID as data, while the timer_to_id
244 * array gives the sta through container_of */
245 u16 tid
= *(u8
*)data
;
246 struct sta_info
*sta
= container_of((void *)data
,
247 struct sta_info
, timer_to_tid
[tid
]);
248 struct tid_ampdu_tx
*tid_tx
;
250 /* check if the TID waits for addBA response */
252 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
254 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
257 "timer expired on tid %d but we are not (or no longer) expecting addBA response there\n",
262 ht_dbg(sta
->sdata
, "addBA response timer expired on tid %d\n", tid
);
264 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
268 static inline int ieee80211_ac_from_tid(int tid
)
270 return ieee802_1d_to_ac
[tid
& 7];
274 * When multiple aggregation sessions on multiple stations
275 * are being created/destroyed simultaneously, we need to
276 * refcount the global queue stop caused by that in order
277 * to not get into a situation where one of the aggregation
278 * setup or teardown re-enables queues before the other is
279 * ready to handle that.
281 * These two functions take care of this issue by keeping
282 * a global "agg_queue_stop" refcount.
284 static void __acquires(agg_queue
)
285 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
287 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
289 if (atomic_inc_return(&sdata
->local
->agg_queue_stop
[queue
]) == 1)
290 ieee80211_stop_queue_by_reason(
291 &sdata
->local
->hw
, queue
,
292 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
293 __acquire(agg_queue
);
296 static void __releases(agg_queue
)
297 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
299 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
301 if (atomic_dec_return(&sdata
->local
->agg_queue_stop
[queue
]) == 0)
302 ieee80211_wake_queue_by_reason(
303 &sdata
->local
->hw
, queue
,
304 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
305 __release(agg_queue
);
309 * splice packets from the STA's pending to the local pending,
310 * requires a call to ieee80211_agg_splice_finish later
312 static void __acquires(agg_queue
)
313 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data
*sdata
,
314 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
316 struct ieee80211_local
*local
= sdata
->local
;
317 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
320 ieee80211_stop_queue_agg(sdata
, tid
);
323 "TID %d gone but expected when splicing aggregates from the pending queue\n",
327 if (!skb_queue_empty(&tid_tx
->pending
)) {
328 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
329 /* copy over remaining packets */
330 skb_queue_splice_tail_init(&tid_tx
->pending
,
331 &local
->pending
[queue
]);
332 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
336 static void __releases(agg_queue
)
337 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data
*sdata
, u16 tid
)
339 ieee80211_wake_queue_agg(sdata
, tid
);
342 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
344 struct tid_ampdu_tx
*tid_tx
;
345 struct ieee80211_local
*local
= sta
->local
;
346 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
350 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
353 * Start queuing up packets for this aggregation session.
354 * We're going to release them once the driver is OK with
357 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
360 * Make sure no packets are being processed. This ensures that
361 * we have a valid starting sequence number and that in-flight
362 * packets have been flushed out and no packets for this TID
363 * will go into the driver during the ampdu_action call.
367 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
369 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
370 &sta
->sta
, tid
, &start_seq_num
, 0);
373 "BA request denied - HW unavailable for tid %d\n", tid
);
374 spin_lock_bh(&sta
->lock
);
375 ieee80211_agg_splice_packets(sdata
, tid_tx
, tid
);
376 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
377 ieee80211_agg_splice_finish(sdata
, tid
);
378 spin_unlock_bh(&sta
->lock
);
380 kfree_rcu(tid_tx
, rcu_head
);
384 /* activate the timer for the recipient's addBA response */
385 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
386 ht_dbg(sdata
, "activated addBA response timer on tid %d\n", tid
);
388 spin_lock_bh(&sta
->lock
);
389 sta
->ampdu_mlme
.last_addba_req_time
[tid
] = jiffies
;
390 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
391 spin_unlock_bh(&sta
->lock
);
393 /* send AddBA request */
394 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
395 tid_tx
->dialog_token
, start_seq_num
,
396 local
->hw
.max_tx_aggregation_subframes
,
401 * After accepting the AddBA Response we activated a timer,
402 * resetting it after each frame that we send.
404 static void sta_tx_agg_session_timer_expired(unsigned long data
)
406 /* not an elegant detour, but there is no choice as the timer passes
407 * only one argument, and various sta_info are needed here, so init
408 * flow in sta_info_create gives the TID as data, while the timer_to_id
409 * array gives the sta through container_of */
410 u8
*ptid
= (u8
*)data
;
411 u8
*timer_to_id
= ptid
- *ptid
;
412 struct sta_info
*sta
= container_of(timer_to_id
, struct sta_info
,
414 struct tid_ampdu_tx
*tid_tx
;
415 unsigned long timeout
;
418 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[*ptid
]);
419 if (!tid_tx
|| test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
424 timeout
= tid_tx
->last_tx
+ TU_TO_JIFFIES(tid_tx
->timeout
);
425 if (time_is_after_jiffies(timeout
)) {
426 mod_timer(&tid_tx
->session_timer
, timeout
);
433 ht_dbg(sta
->sdata
, "tx session timer expired on tid %d\n", (u16
)*ptid
);
435 ieee80211_stop_tx_ba_session(&sta
->sta
, *ptid
);
438 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
441 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
442 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
443 struct ieee80211_local
*local
= sdata
->local
;
444 struct tid_ampdu_tx
*tid_tx
;
447 trace_api_start_tx_ba_session(pubsta
, tid
);
449 if (WARN_ON_ONCE(!local
->ops
->ampdu_action
))
452 if ((tid
>= IEEE80211_NUM_TIDS
) ||
453 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
454 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
457 ht_dbg(sdata
, "Open BA session requested for %pM tid %u\n",
460 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
461 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
462 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
463 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
464 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
467 if (test_sta_flag(sta
, WLAN_STA_BLOCK_BA
)) {
469 "BA sessions blocked - Denying BA session request\n");
474 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
475 * member of an IBSS, and has no other existing Block Ack agreement
476 * with the recipient STA, then the initiating STA shall transmit a
477 * Probe Request frame to the recipient STA and shall not transmit an
478 * ADDBA Request frame unless it receives a Probe Response frame
479 * from the recipient within dot11ADDBAFailureTimeout.
481 * The probe request mechanism for ADDBA is currently not implemented,
482 * but we only build up Block Ack session with HT STAs. This information
483 * is set when we receive a bss info from a probe response or a beacon.
485 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
486 !sta
->sta
.ht_cap
.ht_supported
) {
488 "BA request denied - IBSS STA %pM does not advertise HT support\n",
493 spin_lock_bh(&sta
->lock
);
495 /* we have tried too many times, receiver does not want A-MPDU */
496 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
502 * if we have tried more than HT_AGG_BURST_RETRIES times we
503 * will spread our requests in time to avoid stalling connection
506 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_BURST_RETRIES
&&
507 time_before(jiffies
, sta
->ampdu_mlme
.last_addba_req_time
[tid
] +
508 HT_AGG_RETRIES_PERIOD
)) {
510 "BA request denied - waiting a grace period after %d failed requests on tid %u\n",
511 sta
->ampdu_mlme
.addba_req_num
[tid
], tid
);
516 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
517 /* check if the TID is not in aggregation flow already */
518 if (tid_tx
|| sta
->ampdu_mlme
.tid_start_tx
[tid
]) {
520 "BA request denied - session is not idle on tid %u\n",
526 /* prepare A-MPDU MLME for Tx aggregation */
527 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
533 skb_queue_head_init(&tid_tx
->pending
);
534 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
536 tid_tx
->timeout
= timeout
;
539 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
540 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
541 init_timer(&tid_tx
->addba_resp_timer
);
544 tid_tx
->session_timer
.function
= sta_tx_agg_session_timer_expired
;
545 tid_tx
->session_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
546 init_timer_deferrable(&tid_tx
->session_timer
);
548 /* assign a dialog token */
549 sta
->ampdu_mlme
.dialog_token_allocator
++;
550 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
553 * Finally, assign it to the start array; the work item will
554 * collect it and move it to the normal array.
556 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
558 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
560 /* this flow continues off the work */
562 spin_unlock_bh(&sta
->lock
);
565 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
567 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
568 struct sta_info
*sta
, u16 tid
)
570 struct tid_ampdu_tx
*tid_tx
;
572 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
574 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
576 ht_dbg(sta
->sdata
, "Aggregation is on for tid %d\n", tid
);
578 drv_ampdu_action(local
, sta
->sdata
,
579 IEEE80211_AMPDU_TX_OPERATIONAL
,
580 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
583 * synchronize with TX path, while splicing the TX path
584 * should block so it won't put more packets onto pending.
586 spin_lock_bh(&sta
->lock
);
588 ieee80211_agg_splice_packets(sta
->sdata
, tid_tx
, tid
);
590 * Now mark as operational. This will be visible
591 * in the TX path, and lets it go lock-free in
594 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
595 ieee80211_agg_splice_finish(sta
->sdata
, tid
);
597 spin_unlock_bh(&sta
->lock
);
600 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
602 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
603 struct ieee80211_local
*local
= sdata
->local
;
604 struct sta_info
*sta
;
605 struct tid_ampdu_tx
*tid_tx
;
607 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
609 if (tid
>= IEEE80211_NUM_TIDS
) {
610 ht_dbg(sdata
, "Bad TID value: tid = %d (>= %d)\n",
611 tid
, IEEE80211_NUM_TIDS
);
615 mutex_lock(&local
->sta_mtx
);
616 sta
= sta_info_get_bss(sdata
, ra
);
618 mutex_unlock(&local
->sta_mtx
);
619 ht_dbg(sdata
, "Could not find station: %pM\n", ra
);
623 mutex_lock(&sta
->ampdu_mlme
.mtx
);
624 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
626 if (WARN_ON(!tid_tx
)) {
627 ht_dbg(sdata
, "addBA was not requested!\n");
631 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
634 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
635 ieee80211_agg_tx_operational(local
, sta
, tid
);
638 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
639 mutex_unlock(&local
->sta_mtx
);
642 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
643 const u8
*ra
, u16 tid
)
645 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
646 struct ieee80211_local
*local
= sdata
->local
;
647 struct ieee80211_ra_tid
*ra_tid
;
648 struct sk_buff
*skb
= dev_alloc_skb(0);
653 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
654 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
657 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
658 skb_queue_tail(&sdata
->skb_queue
, skb
);
659 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
661 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
663 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
664 enum ieee80211_agg_stop_reason reason
)
668 mutex_lock(&sta
->ampdu_mlme
.mtx
);
670 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, reason
);
672 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
677 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
679 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
680 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
681 struct ieee80211_local
*local
= sdata
->local
;
682 struct tid_ampdu_tx
*tid_tx
;
685 trace_api_stop_tx_ba_session(pubsta
, tid
);
687 if (!local
->ops
->ampdu_action
)
690 if (tid
>= IEEE80211_NUM_TIDS
)
693 spin_lock_bh(&sta
->lock
);
694 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
701 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
702 /* already in progress stopping it */
707 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
708 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
711 spin_unlock_bh(&sta
->lock
);
714 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
716 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
718 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
719 struct ieee80211_local
*local
= sdata
->local
;
720 struct sta_info
*sta
;
721 struct tid_ampdu_tx
*tid_tx
;
723 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
725 if (tid
>= IEEE80211_NUM_TIDS
) {
726 ht_dbg(sdata
, "Bad TID value: tid = %d (>= %d)\n",
727 tid
, IEEE80211_NUM_TIDS
);
731 ht_dbg(sdata
, "Stopping Tx BA session for %pM tid %d\n", ra
, tid
);
733 mutex_lock(&local
->sta_mtx
);
735 sta
= sta_info_get_bss(sdata
, ra
);
737 ht_dbg(sdata
, "Could not find station: %pM\n", ra
);
741 mutex_lock(&sta
->ampdu_mlme
.mtx
);
742 spin_lock_bh(&sta
->lock
);
743 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
745 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
746 ht_dbg(sdata
, "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(sta
->sdata
, 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(sta
->sdata
, 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 ht_dbg(sta
->sdata
, "wrong addBA response token, tid %d\n", tid
);
826 del_timer_sync(&tid_tx
->addba_resp_timer
);
828 ht_dbg(sta
->sdata
, "switched off addBA timer for tid %d\n", tid
);
831 * addba_resp_timer may have fired before we got here, and
832 * caused WANT_STOP to be set. If the stop then was already
833 * processed further, STOPPING might be set.
835 if (test_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
) ||
836 test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
838 "got addBA resp for tid %d but we already gave up\n",
844 * IEEE 802.11-2007 7.3.1.14:
845 * In an ADDBA Response frame, when the Status Code field
846 * is set to 0, the Buffer Size subfield is set to a value
849 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
850 == WLAN_STATUS_SUCCESS
&& buf_size
) {
851 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
853 /* ignore duplicate response */
857 tid_tx
->buf_size
= buf_size
;
859 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
860 ieee80211_agg_tx_operational(local
, sta
, tid
);
862 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
864 if (tid_tx
->timeout
) {
865 mod_timer(&tid_tx
->session_timer
,
866 TU_TO_EXP_TIME(tid_tx
->timeout
));
867 tid_tx
->last_tx
= jiffies
;
871 ___ieee80211_stop_tx_ba_session(sta
, tid
, AGG_STOP_DECLINED
);
875 mutex_unlock(&sta
->ampdu_mlme
.mtx
);