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_skb_tid(sdata
, skb
, tid
);
141 EXPORT_SYMBOL(ieee80211_send_bar
);
143 void ieee80211_assign_tid_tx(struct sta_info
*sta
, int tid
,
144 struct tid_ampdu_tx
*tid_tx
)
146 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
147 lockdep_assert_held(&sta
->lock
);
148 rcu_assign_pointer(sta
->ampdu_mlme
.tid_tx
[tid
], tid_tx
);
151 int ___ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
152 enum ieee80211_back_parties initiator
,
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 #ifdef CONFIG_MAC80211_HT_DEBUG
188 printk(KERN_DEBUG
"Tx BA session stop requested for %pM tid %u\n",
190 #endif /* CONFIG_MAC80211_HT_DEBUG */
192 del_timer_sync(&tid_tx
->addba_resp_timer
);
193 del_timer_sync(&tid_tx
->session_timer
);
196 * After this packets are no longer handed right through
197 * to the driver but are put onto tid_tx->pending instead,
198 * with locking to ensure proper access.
200 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
203 * There might be a few packets being processed right now (on
204 * another CPU) that have already gotten past the aggregation
205 * check when it was still OPERATIONAL and consequently have
206 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
207 * call into the driver at the same time or even before the
208 * TX paths calls into it, which could confuse the driver.
210 * Wait for all currently running TX paths to finish before
211 * telling the driver. New packets will not go through since
212 * the aggregation session is no longer OPERATIONAL.
216 tid_tx
->stop_initiator
= initiator
;
217 tid_tx
->tx_stop
= tx
;
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
)) {
256 #ifdef CONFIG_MAC80211_HT_DEBUG
257 printk(KERN_DEBUG
"timer expired on tid %d but we are not "
258 "(or no longer) expecting addBA response there\n",
264 #ifdef CONFIG_MAC80211_HT_DEBUG
265 printk(KERN_DEBUG
"addBA response timer expired on tid %d\n", tid
);
268 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
272 static inline int ieee80211_ac_from_tid(int tid
)
274 return ieee802_1d_to_ac
[tid
& 7];
278 * When multiple aggregation sessions on multiple stations
279 * are being created/destroyed simultaneously, we need to
280 * refcount the global queue stop caused by that in order
281 * to not get into a situation where one of the aggregation
282 * setup or teardown re-enables queues before the other is
283 * ready to handle that.
285 * These two functions take care of this issue by keeping
286 * a global "agg_queue_stop" refcount.
288 static void __acquires(agg_queue
)
289 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
291 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
293 if (atomic_inc_return(&sdata
->local
->agg_queue_stop
[queue
]) == 1)
294 ieee80211_stop_queue_by_reason(
295 &sdata
->local
->hw
, queue
,
296 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
297 __acquire(agg_queue
);
300 static void __releases(agg_queue
)
301 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
303 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
305 if (atomic_dec_return(&sdata
->local
->agg_queue_stop
[queue
]) == 0)
306 ieee80211_wake_queue_by_reason(
307 &sdata
->local
->hw
, queue
,
308 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
309 __release(agg_queue
);
313 * splice packets from the STA's pending to the local pending,
314 * requires a call to ieee80211_agg_splice_finish later
316 static void __acquires(agg_queue
)
317 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data
*sdata
,
318 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
320 struct ieee80211_local
*local
= sdata
->local
;
321 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
324 ieee80211_stop_queue_agg(sdata
, tid
);
326 if (WARN(!tid_tx
, "TID %d gone but expected when splicing aggregates"
327 " from the pending queue\n", tid
))
330 if (!skb_queue_empty(&tid_tx
->pending
)) {
331 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
332 /* copy over remaining packets */
333 skb_queue_splice_tail_init(&tid_tx
->pending
,
334 &local
->pending
[queue
]);
335 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
339 static void __releases(agg_queue
)
340 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data
*sdata
, u16 tid
)
342 ieee80211_wake_queue_agg(sdata
, tid
);
345 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
347 struct tid_ampdu_tx
*tid_tx
;
348 struct ieee80211_local
*local
= sta
->local
;
349 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
353 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
356 * Start queuing up packets for this aggregation session.
357 * We're going to release them once the driver is OK with
360 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
363 * Make sure no packets are being processed. This ensures that
364 * we have a valid starting sequence number and that in-flight
365 * packets have been flushed out and no packets for this TID
366 * will go into the driver during the ampdu_action call.
370 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
372 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
373 &sta
->sta
, tid
, &start_seq_num
, 0);
375 #ifdef CONFIG_MAC80211_HT_DEBUG
376 printk(KERN_DEBUG
"BA request denied - HW unavailable for"
379 spin_lock_bh(&sta
->lock
);
380 ieee80211_agg_splice_packets(sdata
, tid_tx
, tid
);
381 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
382 ieee80211_agg_splice_finish(sdata
, tid
);
383 spin_unlock_bh(&sta
->lock
);
385 kfree_rcu(tid_tx
, rcu_head
);
389 /* activate the timer for the recipient's addBA response */
390 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
391 #ifdef CONFIG_MAC80211_HT_DEBUG
392 printk(KERN_DEBUG
"activated addBA response timer on tid %d\n", tid
);
395 spin_lock_bh(&sta
->lock
);
396 sta
->ampdu_mlme
.last_addba_req_time
[tid
] = jiffies
;
397 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
398 spin_unlock_bh(&sta
->lock
);
400 /* send AddBA request */
401 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
402 tid_tx
->dialog_token
, start_seq_num
,
403 local
->hw
.max_tx_aggregation_subframes
,
408 * After accepting the AddBA Response we activated a timer,
409 * resetting it after each frame that we send.
411 static void sta_tx_agg_session_timer_expired(unsigned long data
)
413 /* not an elegant detour, but there is no choice as the timer passes
414 * only one argument, and various sta_info are needed here, so init
415 * flow in sta_info_create gives the TID as data, while the timer_to_id
416 * array gives the sta through container_of */
417 u8
*ptid
= (u8
*)data
;
418 u8
*timer_to_id
= ptid
- *ptid
;
419 struct sta_info
*sta
= container_of(timer_to_id
, struct sta_info
,
421 struct tid_ampdu_tx
*tid_tx
;
422 unsigned long timeout
;
425 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[*ptid
]);
426 if (!tid_tx
|| test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
431 timeout
= tid_tx
->last_tx
+ TU_TO_JIFFIES(tid_tx
->timeout
);
432 if (time_is_after_jiffies(timeout
)) {
433 mod_timer(&tid_tx
->session_timer
, timeout
);
440 #ifdef CONFIG_MAC80211_HT_DEBUG
441 printk(KERN_DEBUG
"tx session timer expired on tid %d\n", (u16
)*ptid
);
444 ieee80211_stop_tx_ba_session(&sta
->sta
, *ptid
);
447 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
450 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
451 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
452 struct ieee80211_local
*local
= sdata
->local
;
453 struct tid_ampdu_tx
*tid_tx
;
456 trace_api_start_tx_ba_session(pubsta
, tid
);
458 if (WARN_ON(!local
->ops
->ampdu_action
))
461 if ((tid
>= STA_TID_NUM
) ||
462 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
463 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
466 #ifdef CONFIG_MAC80211_HT_DEBUG
467 printk(KERN_DEBUG
"Open BA session requested for %pM tid %u\n",
469 #endif /* CONFIG_MAC80211_HT_DEBUG */
471 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
472 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
473 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
474 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
475 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
478 if (test_sta_flag(sta
, WLAN_STA_BLOCK_BA
)) {
479 #ifdef CONFIG_MAC80211_HT_DEBUG
480 printk(KERN_DEBUG
"BA sessions blocked. "
481 "Denying BA session request\n");
487 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
488 * member of an IBSS, and has no other existing Block Ack agreement
489 * with the recipient STA, then the initiating STA shall transmit a
490 * Probe Request frame to the recipient STA and shall not transmit an
491 * ADDBA Request frame unless it receives a Probe Response frame
492 * from the recipient within dot11ADDBAFailureTimeout.
494 * The probe request mechanism for ADDBA is currently not implemented,
495 * but we only build up Block Ack session with HT STAs. This information
496 * is set when we receive a bss info from a probe response or a beacon.
498 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
499 !sta
->sta
.ht_cap
.ht_supported
) {
500 #ifdef CONFIG_MAC80211_HT_DEBUG
501 printk(KERN_DEBUG
"BA request denied - IBSS STA %pM"
502 "does not advertise HT support\n", pubsta
->addr
);
503 #endif /* CONFIG_MAC80211_HT_DEBUG */
507 spin_lock_bh(&sta
->lock
);
509 /* we have tried too many times, receiver does not want A-MPDU */
510 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
516 * if we have tried more than HT_AGG_BURST_RETRIES times we
517 * will spread our requests in time to avoid stalling connection
520 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_BURST_RETRIES
&&
521 time_before(jiffies
, sta
->ampdu_mlme
.last_addba_req_time
[tid
] +
522 HT_AGG_RETRIES_PERIOD
)) {
523 #ifdef CONFIG_MAC80211_HT_DEBUG
524 printk(KERN_DEBUG
"BA request denied - "
525 "waiting a grace period after %d failed requests "
527 sta
->ampdu_mlme
.addba_req_num
[tid
], tid
);
528 #endif /* CONFIG_MAC80211_HT_DEBUG */
533 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
534 /* check if the TID is not in aggregation flow already */
535 if (tid_tx
|| sta
->ampdu_mlme
.tid_start_tx
[tid
]) {
536 #ifdef CONFIG_MAC80211_HT_DEBUG
537 printk(KERN_DEBUG
"BA request denied - session is not "
538 "idle on tid %u\n", tid
);
539 #endif /* CONFIG_MAC80211_HT_DEBUG */
544 /* prepare A-MPDU MLME for Tx aggregation */
545 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
551 skb_queue_head_init(&tid_tx
->pending
);
552 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
554 tid_tx
->timeout
= timeout
;
557 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
558 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
559 init_timer(&tid_tx
->addba_resp_timer
);
562 tid_tx
->session_timer
.function
= sta_tx_agg_session_timer_expired
;
563 tid_tx
->session_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
564 init_timer_deferrable(&tid_tx
->session_timer
);
566 /* assign a dialog token */
567 sta
->ampdu_mlme
.dialog_token_allocator
++;
568 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
571 * Finally, assign it to the start array; the work item will
572 * collect it and move it to the normal array.
574 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
576 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
578 /* this flow continues off the work */
580 spin_unlock_bh(&sta
->lock
);
583 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
585 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
586 struct sta_info
*sta
, u16 tid
)
588 struct tid_ampdu_tx
*tid_tx
;
590 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
592 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
594 #ifdef CONFIG_MAC80211_HT_DEBUG
595 printk(KERN_DEBUG
"Aggregation is on for tid %d\n", tid
);
598 drv_ampdu_action(local
, sta
->sdata
,
599 IEEE80211_AMPDU_TX_OPERATIONAL
,
600 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
603 * synchronize with TX path, while splicing the TX path
604 * should block so it won't put more packets onto pending.
606 spin_lock_bh(&sta
->lock
);
608 ieee80211_agg_splice_packets(sta
->sdata
, tid_tx
, tid
);
610 * Now mark as operational. This will be visible
611 * in the TX path, and lets it go lock-free in
614 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
615 ieee80211_agg_splice_finish(sta
->sdata
, tid
);
617 spin_unlock_bh(&sta
->lock
);
620 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
622 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
623 struct ieee80211_local
*local
= sdata
->local
;
624 struct sta_info
*sta
;
625 struct tid_ampdu_tx
*tid_tx
;
627 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
629 if (tid
>= STA_TID_NUM
) {
630 #ifdef CONFIG_MAC80211_HT_DEBUG
631 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
637 mutex_lock(&local
->sta_mtx
);
638 sta
= sta_info_get_bss(sdata
, ra
);
640 mutex_unlock(&local
->sta_mtx
);
641 #ifdef CONFIG_MAC80211_HT_DEBUG
642 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
647 mutex_lock(&sta
->ampdu_mlme
.mtx
);
648 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
650 if (WARN_ON(!tid_tx
)) {
651 #ifdef CONFIG_MAC80211_HT_DEBUG
652 printk(KERN_DEBUG
"addBA was not requested!\n");
657 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
660 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
661 ieee80211_agg_tx_operational(local
, sta
, tid
);
664 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
665 mutex_unlock(&local
->sta_mtx
);
668 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
669 const u8
*ra
, u16 tid
)
671 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
672 struct ieee80211_local
*local
= sdata
->local
;
673 struct ieee80211_ra_tid
*ra_tid
;
674 struct sk_buff
*skb
= dev_alloc_skb(0);
679 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
680 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
683 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
684 skb_queue_tail(&sdata
->skb_queue
, skb
);
685 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
687 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
689 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
690 enum ieee80211_back_parties initiator
,
695 mutex_lock(&sta
->ampdu_mlme
.mtx
);
697 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
699 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
704 int ieee80211_stop_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
)
706 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
707 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
708 struct ieee80211_local
*local
= sdata
->local
;
709 struct tid_ampdu_tx
*tid_tx
;
712 trace_api_stop_tx_ba_session(pubsta
, tid
);
714 if (!local
->ops
->ampdu_action
)
717 if (tid
>= STA_TID_NUM
)
720 spin_lock_bh(&sta
->lock
);
721 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
728 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
729 /* already in progress stopping it */
734 set_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
);
735 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
738 spin_unlock_bh(&sta
->lock
);
741 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session
);
743 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u8 tid
)
745 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
746 struct ieee80211_local
*local
= sdata
->local
;
747 struct sta_info
*sta
;
748 struct tid_ampdu_tx
*tid_tx
;
750 trace_api_stop_tx_ba_cb(sdata
, ra
, tid
);
752 if (tid
>= STA_TID_NUM
) {
753 #ifdef CONFIG_MAC80211_HT_DEBUG
754 printk(KERN_DEBUG
"Bad TID value: tid = %d (>= %d)\n",
760 #ifdef CONFIG_MAC80211_HT_DEBUG
761 printk(KERN_DEBUG
"Stopping Tx BA session for %pM tid %d\n",
763 #endif /* CONFIG_MAC80211_HT_DEBUG */
765 mutex_lock(&local
->sta_mtx
);
767 sta
= sta_info_get_bss(sdata
, ra
);
769 #ifdef CONFIG_MAC80211_HT_DEBUG
770 printk(KERN_DEBUG
"Could not find station: %pM\n", ra
);
775 mutex_lock(&sta
->ampdu_mlme
.mtx
);
776 spin_lock_bh(&sta
->lock
);
777 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
779 if (!tid_tx
|| !test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
780 #ifdef CONFIG_MAC80211_HT_DEBUG
781 printk(KERN_DEBUG
"unexpected callback to A-MPDU stop\n");
786 if (tid_tx
->stop_initiator
== WLAN_BACK_INITIATOR
&& tid_tx
->tx_stop
)
787 ieee80211_send_delba(sta
->sdata
, ra
, tid
,
788 WLAN_BACK_INITIATOR
, WLAN_REASON_QSTA_NOT_USE
);
791 * When we get here, the TX path will not be lockless any more wrt.
792 * aggregation, since the OPERATIONAL bit has long been cleared.
793 * Thus it will block on getting the lock, if it occurs. So if we
794 * stop the queue now, we will not get any more packets, and any
795 * that might be being processed will wait for us here, thereby
796 * guaranteeing that no packets go to the tid_tx pending queue any
800 ieee80211_agg_splice_packets(sta
->sdata
, tid_tx
, tid
);
802 /* future packets must not find the tid_tx struct any more */
803 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
805 ieee80211_agg_splice_finish(sta
->sdata
, tid
);
807 kfree_rcu(tid_tx
, rcu_head
);
810 spin_unlock_bh(&sta
->lock
);
811 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
813 mutex_unlock(&local
->sta_mtx
);
816 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
817 const u8
*ra
, u16 tid
)
819 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
820 struct ieee80211_local
*local
= sdata
->local
;
821 struct ieee80211_ra_tid
*ra_tid
;
822 struct sk_buff
*skb
= dev_alloc_skb(0);
827 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
828 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
831 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_STOP
;
832 skb_queue_tail(&sdata
->skb_queue
, skb
);
833 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
835 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe
);
838 void ieee80211_process_addba_resp(struct ieee80211_local
*local
,
839 struct sta_info
*sta
,
840 struct ieee80211_mgmt
*mgmt
,
843 struct tid_ampdu_tx
*tid_tx
;
847 capab
= le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.capab
);
848 tid
= (capab
& IEEE80211_ADDBA_PARAM_TID_MASK
) >> 2;
849 buf_size
= (capab
& IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK
) >> 6;
851 mutex_lock(&sta
->ampdu_mlme
.mtx
);
853 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
857 if (mgmt
->u
.action
.u
.addba_resp
.dialog_token
!= tid_tx
->dialog_token
) {
858 #ifdef CONFIG_MAC80211_HT_DEBUG
859 printk(KERN_DEBUG
"wrong addBA response token, tid %d\n", tid
);
864 del_timer_sync(&tid_tx
->addba_resp_timer
);
866 #ifdef CONFIG_MAC80211_HT_DEBUG
867 printk(KERN_DEBUG
"switched off addBA timer for tid %d\n", tid
);
871 * addba_resp_timer may have fired before we got here, and
872 * caused WANT_STOP to be set. If the stop then was already
873 * processed further, STOPPING might be set.
875 if (test_bit(HT_AGG_STATE_WANT_STOP
, &tid_tx
->state
) ||
876 test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
877 #ifdef CONFIG_MAC80211_HT_DEBUG
879 "got addBA resp for tid %d but we already gave up\n",
886 * IEEE 802.11-2007 7.3.1.14:
887 * In an ADDBA Response frame, when the Status Code field
888 * is set to 0, the Buffer Size subfield is set to a value
891 if (le16_to_cpu(mgmt
->u
.action
.u
.addba_resp
.status
)
892 == WLAN_STATUS_SUCCESS
&& buf_size
) {
893 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED
,
895 /* ignore duplicate response */
899 tid_tx
->buf_size
= buf_size
;
901 if (test_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
))
902 ieee80211_agg_tx_operational(local
, sta
, tid
);
904 sta
->ampdu_mlme
.addba_req_num
[tid
] = 0;
906 if (tid_tx
->timeout
) {
907 mod_timer(&tid_tx
->session_timer
,
908 TU_TO_EXP_TIME(tid_tx
->timeout
));
909 tid_tx
->last_tx
= jiffies
;
913 ___ieee80211_stop_tx_ba_session(sta
, tid
, WLAN_BACK_INITIATOR
,
918 mutex_unlock(&sta
->ampdu_mlme
.mtx
);