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_back_parties initiator
,
156 struct ieee80211_local
*local
= sta
->local
;
157 struct tid_ampdu_tx
*tid_tx
;
160 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
162 spin_lock_bh(&sta
->lock
);
164 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
166 spin_unlock_bh(&sta
->lock
);
170 /* if we're already stopping ignore any new requests to stop */
171 if (test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
172 spin_unlock_bh(&sta
->lock
);
176 if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
177 /* not even started yet! */
178 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
179 spin_unlock_bh(&sta
->lock
);
180 kfree_rcu(tid_tx
, rcu_head
);
184 set_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
);
186 spin_unlock_bh(&sta
->lock
);
188 ht_dbg(sta
->sdata
, "Tx BA session stop requested for %pM tid %u\n",
191 del_timer_sync(&tid_tx
->addba_resp_timer
);
192 del_timer_sync(&tid_tx
->session_timer
);
195 * After this packets are no longer handed right through
196 * to the driver but are put onto tid_tx->pending instead,
197 * with locking to ensure proper access.
199 clear_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
202 * There might be a few packets being processed right now (on
203 * another CPU) that have already gotten past the aggregation
204 * check when it was still OPERATIONAL and consequently have
205 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
206 * call into the driver at the same time or even before the
207 * TX paths calls into it, which could confuse the driver.
209 * Wait for all currently running TX paths to finish before
210 * telling the driver. New packets will not go through since
211 * the aggregation session is no longer OPERATIONAL.
215 tid_tx
->stop_initiator
= initiator
;
216 tid_tx
->tx_stop
= tx
;
218 ret
= drv_ampdu_action(local
, sta
->sdata
,
219 IEEE80211_AMPDU_TX_STOP
,
220 &sta
->sta
, tid
, NULL
, 0);
222 /* HW shall not deny going back to legacy */
225 * We may have pending packets get stuck in this case...
226 * Not bothering with a workaround for now.
234 * After sending add Block Ack request we activated a timer until
235 * add Block Ack response will arrive from the recipient.
236 * If this timer expires sta_addba_resp_timer_expired will be executed.
238 static void sta_addba_resp_timer_expired(unsigned long data
)
240 /* not an elegant detour, but there is no choice as the timer passes
241 * only one argument, and both sta_info and TID are needed, so init
242 * flow in sta_info_create gives the TID as data, while the timer_to_id
243 * array gives the sta through container_of */
244 u16 tid
= *(u8
*)data
;
245 struct sta_info
*sta
= container_of((void *)data
,
246 struct sta_info
, timer_to_tid
[tid
]);
247 struct tid_ampdu_tx
*tid_tx
;
249 /* check if the TID waits for addBA response */
251 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
253 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
)) {
256 "timer expired on tid %d but we are not (or no longer) expecting addBA response there\n",
261 ht_dbg(sta
->sdata
, "addBA response timer expired on tid %d\n", tid
);
263 ieee80211_stop_tx_ba_session(&sta
->sta
, tid
);
267 static inline int ieee80211_ac_from_tid(int tid
)
269 return ieee802_1d_to_ac
[tid
& 7];
273 * When multiple aggregation sessions on multiple stations
274 * are being created/destroyed simultaneously, we need to
275 * refcount the global queue stop caused by that in order
276 * to not get into a situation where one of the aggregation
277 * setup or teardown re-enables queues before the other is
278 * ready to handle that.
280 * These two functions take care of this issue by keeping
281 * a global "agg_queue_stop" refcount.
283 static void __acquires(agg_queue
)
284 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
286 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
288 if (atomic_inc_return(&sdata
->local
->agg_queue_stop
[queue
]) == 1)
289 ieee80211_stop_queue_by_reason(
290 &sdata
->local
->hw
, queue
,
291 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
292 __acquire(agg_queue
);
295 static void __releases(agg_queue
)
296 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data
*sdata
, int tid
)
298 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
300 if (atomic_dec_return(&sdata
->local
->agg_queue_stop
[queue
]) == 0)
301 ieee80211_wake_queue_by_reason(
302 &sdata
->local
->hw
, queue
,
303 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
304 __release(agg_queue
);
308 * splice packets from the STA's pending to the local pending,
309 * requires a call to ieee80211_agg_splice_finish later
311 static void __acquires(agg_queue
)
312 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data
*sdata
,
313 struct tid_ampdu_tx
*tid_tx
, u16 tid
)
315 struct ieee80211_local
*local
= sdata
->local
;
316 int queue
= sdata
->vif
.hw_queue
[ieee80211_ac_from_tid(tid
)];
319 ieee80211_stop_queue_agg(sdata
, tid
);
322 "TID %d gone but expected when splicing aggregates from the pending queue\n",
326 if (!skb_queue_empty(&tid_tx
->pending
)) {
327 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
328 /* copy over remaining packets */
329 skb_queue_splice_tail_init(&tid_tx
->pending
,
330 &local
->pending
[queue
]);
331 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
335 static void __releases(agg_queue
)
336 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data
*sdata
, u16 tid
)
338 ieee80211_wake_queue_agg(sdata
, tid
);
341 void ieee80211_tx_ba_session_handle_start(struct sta_info
*sta
, int tid
)
343 struct tid_ampdu_tx
*tid_tx
;
344 struct ieee80211_local
*local
= sta
->local
;
345 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
349 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
352 * Start queuing up packets for this aggregation session.
353 * We're going to release them once the driver is OK with
356 clear_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
359 * Make sure no packets are being processed. This ensures that
360 * we have a valid starting sequence number and that in-flight
361 * packets have been flushed out and no packets for this TID
362 * will go into the driver during the ampdu_action call.
366 start_seq_num
= sta
->tid_seq
[tid
] >> 4;
368 ret
= drv_ampdu_action(local
, sdata
, IEEE80211_AMPDU_TX_START
,
369 &sta
->sta
, tid
, &start_seq_num
, 0);
372 "BA request denied - HW unavailable for tid %d\n", tid
);
373 spin_lock_bh(&sta
->lock
);
374 ieee80211_agg_splice_packets(sdata
, tid_tx
, tid
);
375 ieee80211_assign_tid_tx(sta
, tid
, NULL
);
376 ieee80211_agg_splice_finish(sdata
, tid
);
377 spin_unlock_bh(&sta
->lock
);
379 kfree_rcu(tid_tx
, rcu_head
);
383 /* activate the timer for the recipient's addBA response */
384 mod_timer(&tid_tx
->addba_resp_timer
, jiffies
+ ADDBA_RESP_INTERVAL
);
385 ht_dbg(sdata
, "activated addBA response timer on tid %d\n", tid
);
387 spin_lock_bh(&sta
->lock
);
388 sta
->ampdu_mlme
.last_addba_req_time
[tid
] = jiffies
;
389 sta
->ampdu_mlme
.addba_req_num
[tid
]++;
390 spin_unlock_bh(&sta
->lock
);
392 /* send AddBA request */
393 ieee80211_send_addba_request(sdata
, sta
->sta
.addr
, tid
,
394 tid_tx
->dialog_token
, start_seq_num
,
395 local
->hw
.max_tx_aggregation_subframes
,
400 * After accepting the AddBA Response we activated a timer,
401 * resetting it after each frame that we send.
403 static void sta_tx_agg_session_timer_expired(unsigned long data
)
405 /* not an elegant detour, but there is no choice as the timer passes
406 * only one argument, and various sta_info are needed here, so init
407 * flow in sta_info_create gives the TID as data, while the timer_to_id
408 * array gives the sta through container_of */
409 u8
*ptid
= (u8
*)data
;
410 u8
*timer_to_id
= ptid
- *ptid
;
411 struct sta_info
*sta
= container_of(timer_to_id
, struct sta_info
,
413 struct tid_ampdu_tx
*tid_tx
;
414 unsigned long timeout
;
417 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[*ptid
]);
418 if (!tid_tx
|| test_bit(HT_AGG_STATE_STOPPING
, &tid_tx
->state
)) {
423 timeout
= tid_tx
->last_tx
+ TU_TO_JIFFIES(tid_tx
->timeout
);
424 if (time_is_after_jiffies(timeout
)) {
425 mod_timer(&tid_tx
->session_timer
, timeout
);
432 ht_dbg(sta
->sdata
, "tx session timer expired on tid %d\n", (u16
)*ptid
);
434 ieee80211_stop_tx_ba_session(&sta
->sta
, *ptid
);
437 int ieee80211_start_tx_ba_session(struct ieee80211_sta
*pubsta
, u16 tid
,
440 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
441 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
442 struct ieee80211_local
*local
= sdata
->local
;
443 struct tid_ampdu_tx
*tid_tx
;
446 trace_api_start_tx_ba_session(pubsta
, tid
);
448 if (WARN_ON(!local
->ops
->ampdu_action
))
451 if ((tid
>= STA_TID_NUM
) ||
452 !(local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) ||
453 (local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
))
456 ht_dbg(sdata
, "Open BA session requested for %pM tid %u\n",
459 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
460 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
461 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
462 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
463 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
466 if (test_sta_flag(sta
, WLAN_STA_BLOCK_BA
)) {
468 "BA sessions blocked - Denying BA session request\n");
473 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
474 * member of an IBSS, and has no other existing Block Ack agreement
475 * with the recipient STA, then the initiating STA shall transmit a
476 * Probe Request frame to the recipient STA and shall not transmit an
477 * ADDBA Request frame unless it receives a Probe Response frame
478 * from the recipient within dot11ADDBAFailureTimeout.
480 * The probe request mechanism for ADDBA is currently not implemented,
481 * but we only build up Block Ack session with HT STAs. This information
482 * is set when we receive a bss info from a probe response or a beacon.
484 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
485 !sta
->sta
.ht_cap
.ht_supported
) {
487 "BA request denied - IBSS STA %pM does not advertise HT support\n",
492 spin_lock_bh(&sta
->lock
);
494 /* we have tried too many times, receiver does not want A-MPDU */
495 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_MAX_RETRIES
) {
501 * if we have tried more than HT_AGG_BURST_RETRIES times we
502 * will spread our requests in time to avoid stalling connection
505 if (sta
->ampdu_mlme
.addba_req_num
[tid
] > HT_AGG_BURST_RETRIES
&&
506 time_before(jiffies
, sta
->ampdu_mlme
.last_addba_req_time
[tid
] +
507 HT_AGG_RETRIES_PERIOD
)) {
509 "BA request denied - waiting a grace period after %d failed requests on tid %u\n",
510 sta
->ampdu_mlme
.addba_req_num
[tid
], tid
);
515 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
516 /* check if the TID is not in aggregation flow already */
517 if (tid_tx
|| sta
->ampdu_mlme
.tid_start_tx
[tid
]) {
519 "BA request denied - session is not idle on tid %u\n",
525 /* prepare A-MPDU MLME for Tx aggregation */
526 tid_tx
= kzalloc(sizeof(struct tid_ampdu_tx
), GFP_ATOMIC
);
532 skb_queue_head_init(&tid_tx
->pending
);
533 __set_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
);
535 tid_tx
->timeout
= timeout
;
538 tid_tx
->addba_resp_timer
.function
= sta_addba_resp_timer_expired
;
539 tid_tx
->addba_resp_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
540 init_timer(&tid_tx
->addba_resp_timer
);
543 tid_tx
->session_timer
.function
= sta_tx_agg_session_timer_expired
;
544 tid_tx
->session_timer
.data
= (unsigned long)&sta
->timer_to_tid
[tid
];
545 init_timer_deferrable(&tid_tx
->session_timer
);
547 /* assign a dialog token */
548 sta
->ampdu_mlme
.dialog_token_allocator
++;
549 tid_tx
->dialog_token
= sta
->ampdu_mlme
.dialog_token_allocator
;
552 * Finally, assign it to the start array; the work item will
553 * collect it and move it to the normal array.
555 sta
->ampdu_mlme
.tid_start_tx
[tid
] = tid_tx
;
557 ieee80211_queue_work(&local
->hw
, &sta
->ampdu_mlme
.work
);
559 /* this flow continues off the work */
561 spin_unlock_bh(&sta
->lock
);
564 EXPORT_SYMBOL(ieee80211_start_tx_ba_session
);
566 static void ieee80211_agg_tx_operational(struct ieee80211_local
*local
,
567 struct sta_info
*sta
, u16 tid
)
569 struct tid_ampdu_tx
*tid_tx
;
571 lockdep_assert_held(&sta
->ampdu_mlme
.mtx
);
573 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
575 ht_dbg(sta
->sdata
, "Aggregation is on for tid %d\n", tid
);
577 drv_ampdu_action(local
, sta
->sdata
,
578 IEEE80211_AMPDU_TX_OPERATIONAL
,
579 &sta
->sta
, tid
, NULL
, tid_tx
->buf_size
);
582 * synchronize with TX path, while splicing the TX path
583 * should block so it won't put more packets onto pending.
585 spin_lock_bh(&sta
->lock
);
587 ieee80211_agg_splice_packets(sta
->sdata
, tid_tx
, tid
);
589 * Now mark as operational. This will be visible
590 * in the TX path, and lets it go lock-free in
593 set_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
);
594 ieee80211_agg_splice_finish(sta
->sdata
, tid
);
596 spin_unlock_bh(&sta
->lock
);
599 void ieee80211_start_tx_ba_cb(struct ieee80211_vif
*vif
, u8
*ra
, u16 tid
)
601 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
602 struct ieee80211_local
*local
= sdata
->local
;
603 struct sta_info
*sta
;
604 struct tid_ampdu_tx
*tid_tx
;
606 trace_api_start_tx_ba_cb(sdata
, ra
, tid
);
608 if (tid
>= STA_TID_NUM
) {
609 ht_dbg(sdata
, "Bad TID value: tid = %d (>= %d)\n",
614 mutex_lock(&local
->sta_mtx
);
615 sta
= sta_info_get_bss(sdata
, ra
);
617 mutex_unlock(&local
->sta_mtx
);
618 ht_dbg(sdata
, "Could not find station: %pM\n", ra
);
622 mutex_lock(&sta
->ampdu_mlme
.mtx
);
623 tid_tx
= rcu_dereference_protected_tid_tx(sta
, tid
);
625 if (WARN_ON(!tid_tx
)) {
626 ht_dbg(sdata
, "addBA was not requested!\n");
630 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY
, &tid_tx
->state
)))
633 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED
, &tid_tx
->state
))
634 ieee80211_agg_tx_operational(local
, sta
, tid
);
637 mutex_unlock(&sta
->ampdu_mlme
.mtx
);
638 mutex_unlock(&local
->sta_mtx
);
641 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif
*vif
,
642 const u8
*ra
, u16 tid
)
644 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
645 struct ieee80211_local
*local
= sdata
->local
;
646 struct ieee80211_ra_tid
*ra_tid
;
647 struct sk_buff
*skb
= dev_alloc_skb(0);
652 ra_tid
= (struct ieee80211_ra_tid
*) &skb
->cb
;
653 memcpy(&ra_tid
->ra
, ra
, ETH_ALEN
);
656 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_AGG_START
;
657 skb_queue_tail(&sdata
->skb_queue
, skb
);
658 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
660 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe
);
662 int __ieee80211_stop_tx_ba_session(struct sta_info
*sta
, u16 tid
,
663 enum ieee80211_back_parties initiator
,
668 mutex_lock(&sta
->ampdu_mlme
.mtx
);
670 ret
= ___ieee80211_stop_tx_ba_session(sta
, tid
, initiator
, tx
);
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
>= STA_TID_NUM
)
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
>= STA_TID_NUM
) {
726 ht_dbg(sdata
, "Bad TID value: tid = %d (>= %d)\n",
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
, WLAN_BACK_INITIATOR
,
876 mutex_unlock(&sta
->ampdu_mlme
.mtx
);