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(sdata, skb);
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);
153 * When multiple aggregation sessions on multiple stations
154 * are being created/destroyed simultaneously, we need to
155 * refcount the global queue stop caused by that in order
156 * to not get into a situation where one of the aggregation
157 * setup or teardown re-enables queues before the other is
158 * ready to handle that.
160 * These two functions take care of this issue by keeping
161 * a global "agg_queue_stop" refcount.
163 static void __acquires(agg_queue)
164 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
166 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
168 /* we do refcounting here, so don't use the queue reason refcounting */
170 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
171 ieee80211_stop_queue_by_reason(
172 &sdata->local->hw, queue,
173 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
175 __acquire(agg_queue);
178 static void __releases(agg_queue)
179 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
181 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
183 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
184 ieee80211_wake_queue_by_reason(
185 &sdata->local->hw, queue,
186 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
188 __release(agg_queue);
192 * splice packets from the STA's pending to the local pending,
193 * requires a call to ieee80211_agg_splice_finish later
195 static void __acquires(agg_queue)
196 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
197 struct tid_ampdu_tx *tid_tx, u16 tid)
199 struct ieee80211_local *local = sdata->local;
200 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
203 ieee80211_stop_queue_agg(sdata, tid);
206 "TID %d gone but expected when splicing aggregates from the pending queue\n",
210 if (!skb_queue_empty(&tid_tx->pending)) {
211 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
212 /* copy over remaining packets */
213 skb_queue_splice_tail_init(&tid_tx->pending,
214 &local->pending[queue]);
215 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
219 static void __releases(agg_queue)
220 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
222 ieee80211_wake_queue_agg(sdata, tid);
225 static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
227 struct tid_ampdu_tx *tid_tx;
229 lockdep_assert_held(&sta->ampdu_mlme.mtx);
230 lockdep_assert_held(&sta->lock);
232 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
235 * When we get here, the TX path will not be lockless any more wrt.
236 * aggregation, since the OPERATIONAL bit has long been cleared.
237 * Thus it will block on getting the lock, if it occurs. So if we
238 * stop the queue now, we will not get any more packets, and any
239 * that might be being processed will wait for us here, thereby
240 * guaranteeing that no packets go to the tid_tx pending queue any
244 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
246 /* future packets must not find the tid_tx struct any more */
247 ieee80211_assign_tid_tx(sta, tid, NULL);
249 ieee80211_agg_splice_finish(sta->sdata, tid);
251 kfree_rcu(tid_tx, rcu_head);
254 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
255 enum ieee80211_agg_stop_reason reason)
257 struct ieee80211_local *local = sta->local;
258 struct tid_ampdu_tx *tid_tx;
259 enum ieee80211_ampdu_mlme_action action;
262 lockdep_assert_held(&sta->ampdu_mlme.mtx);
265 case AGG_STOP_DECLINED:
266 case AGG_STOP_LOCAL_REQUEST:
267 case AGG_STOP_PEER_REQUEST:
268 action = IEEE80211_AMPDU_TX_STOP_CONT;
270 case AGG_STOP_DESTROY_STA:
271 action = IEEE80211_AMPDU_TX_STOP_FLUSH;
278 spin_lock_bh(&sta->lock);
280 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
282 spin_unlock_bh(&sta->lock);
287 * if we're already stopping ignore any new requests to stop
288 * unless we're destroying it in which case notify the driver
290 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
291 spin_unlock_bh(&sta->lock);
292 if (reason != AGG_STOP_DESTROY_STA)
294 ret = drv_ampdu_action(local, sta->sdata,
295 IEEE80211_AMPDU_TX_STOP_FLUSH_CONT,
296 &sta->sta, tid, NULL, 0);
301 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
302 /* not even started yet! */
303 ieee80211_assign_tid_tx(sta, tid, NULL);
304 spin_unlock_bh(&sta->lock);
305 kfree_rcu(tid_tx, rcu_head);
309 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
311 spin_unlock_bh(&sta->lock);
313 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
316 del_timer_sync(&tid_tx->addba_resp_timer);
317 del_timer_sync(&tid_tx->session_timer);
320 * After this packets are no longer handed right through
321 * to the driver but are put onto tid_tx->pending instead,
322 * with locking to ensure proper access.
324 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
327 * There might be a few packets being processed right now (on
328 * another CPU) that have already gotten past the aggregation
329 * check when it was still OPERATIONAL and consequently have
330 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
331 * call into the driver at the same time or even before the
332 * TX paths calls into it, which could confuse the driver.
334 * Wait for all currently running TX paths to finish before
335 * telling the driver. New packets will not go through since
336 * the aggregation session is no longer OPERATIONAL.
340 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
341 WLAN_BACK_RECIPIENT :
343 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
345 ret = drv_ampdu_action(local, sta->sdata, action,
346 &sta->sta, tid, NULL, 0);
348 /* HW shall not deny going back to legacy */
351 * We may have pending packets get stuck in this case...
352 * Not bothering with a workaround for now.
357 * In the case of AGG_STOP_DESTROY_STA, the driver won't
358 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
359 * seem like we can leave the tid_tx data pending forever.
360 * This is true, in a way, but "forever" is only until the
361 * station struct is actually destroyed. In the meantime,
362 * leaving it around ensures that we don't transmit packets
363 * to the driver on this TID which might confuse it.
370 * After sending add Block Ack request we activated a timer until
371 * add Block Ack response will arrive from the recipient.
372 * If this timer expires sta_addba_resp_timer_expired will be executed.
374 static void sta_addba_resp_timer_expired(unsigned long data)
376 /* not an elegant detour, but there is no choice as the timer passes
377 * only one argument, and both sta_info and TID are needed, so init
378 * flow in sta_info_create gives the TID as data, while the timer_to_id
379 * array gives the sta through container_of */
380 u16 tid = *(u8 *)data;
381 struct sta_info *sta = container_of((void *)data,
382 struct sta_info, timer_to_tid[tid]);
383 struct tid_ampdu_tx *tid_tx;
385 /* check if the TID waits for addBA response */
387 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
389 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
392 "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n",
397 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
400 ieee80211_stop_tx_ba_session(&sta->sta, tid);
404 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
406 struct tid_ampdu_tx *tid_tx;
407 struct ieee80211_local *local = sta->local;
408 struct ieee80211_sub_if_data *sdata = sta->sdata;
412 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
415 * Start queuing up packets for this aggregation session.
416 * We're going to release them once the driver is OK with
419 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
422 * Make sure no packets are being processed. This ensures that
423 * we have a valid starting sequence number and that in-flight
424 * packets have been flushed out and no packets for this TID
425 * will go into the driver during the ampdu_action call.
429 start_seq_num = sta->tid_seq[tid] >> 4;
431 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
432 &sta->sta, tid, &start_seq_num, 0);
435 "BA request denied - HW unavailable for %pM tid %d\n",
437 spin_lock_bh(&sta->lock);
438 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
439 ieee80211_assign_tid_tx(sta, tid, NULL);
440 ieee80211_agg_splice_finish(sdata, tid);
441 spin_unlock_bh(&sta->lock);
443 kfree_rcu(tid_tx, rcu_head);
447 /* activate the timer for the recipient's addBA response */
448 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
449 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
452 spin_lock_bh(&sta->lock);
453 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
454 sta->ampdu_mlme.addba_req_num[tid]++;
455 spin_unlock_bh(&sta->lock);
457 /* send AddBA request */
458 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
459 tid_tx->dialog_token, start_seq_num,
460 local->hw.max_tx_aggregation_subframes,
465 * After accepting the AddBA Response we activated a timer,
466 * resetting it after each frame that we send.
468 static void sta_tx_agg_session_timer_expired(unsigned long data)
470 /* not an elegant detour, but there is no choice as the timer passes
471 * only one argument, and various sta_info are needed here, so init
472 * flow in sta_info_create gives the TID as data, while the timer_to_id
473 * array gives the sta through container_of */
474 u8 *ptid = (u8 *)data;
475 u8 *timer_to_id = ptid - *ptid;
476 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
478 struct tid_ampdu_tx *tid_tx;
479 unsigned long timeout;
482 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
483 if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
488 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
489 if (time_is_after_jiffies(timeout)) {
490 mod_timer(&tid_tx->session_timer, timeout);
497 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
498 sta->sta.addr, (u16)*ptid);
500 ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
503 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
506 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
507 struct ieee80211_sub_if_data *sdata = sta->sdata;
508 struct ieee80211_local *local = sdata->local;
509 struct tid_ampdu_tx *tid_tx;
512 if (WARN(sta->reserved_tid == tid,
513 "Requested to start BA session on reserved tid=%d", tid))
516 trace_api_start_tx_ba_session(pubsta, tid);
518 if (WARN_ON_ONCE(!local->ops->ampdu_action))
521 if ((tid >= IEEE80211_NUM_TIDS) ||
522 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
523 (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
526 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
529 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
530 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
531 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
532 sdata->vif.type != NL80211_IFTYPE_AP &&
533 sdata->vif.type != NL80211_IFTYPE_ADHOC)
536 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
538 "BA sessions blocked - Denying BA session request %pM tid %d\n",
544 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
545 * member of an IBSS, and has no other existing Block Ack agreement
546 * with the recipient STA, then the initiating STA shall transmit a
547 * Probe Request frame to the recipient STA and shall not transmit an
548 * ADDBA Request frame unless it receives a Probe Response frame
549 * from the recipient within dot11ADDBAFailureTimeout.
551 * The probe request mechanism for ADDBA is currently not implemented,
552 * but we only build up Block Ack session with HT STAs. This information
553 * is set when we receive a bss info from a probe response or a beacon.
555 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
556 !sta->sta.ht_cap.ht_supported) {
558 "BA request denied - IBSS STA %pM does not advertise HT support\n",
563 spin_lock_bh(&sta->lock);
565 /* we have tried too many times, receiver does not want A-MPDU */
566 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
572 * if we have tried more than HT_AGG_BURST_RETRIES times we
573 * will spread our requests in time to avoid stalling connection
576 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
577 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
578 HT_AGG_RETRIES_PERIOD)) {
580 "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n",
581 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
586 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
587 /* check if the TID is not in aggregation flow already */
588 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
590 "BA request denied - session is not idle on %pM tid %u\n",
596 /* prepare A-MPDU MLME for Tx aggregation */
597 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
603 skb_queue_head_init(&tid_tx->pending);
604 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
606 tid_tx->timeout = timeout;
609 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
610 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
611 init_timer(&tid_tx->addba_resp_timer);
614 tid_tx->session_timer.function = sta_tx_agg_session_timer_expired;
615 tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
616 init_timer_deferrable(&tid_tx->session_timer);
618 /* assign a dialog token */
619 sta->ampdu_mlme.dialog_token_allocator++;
620 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
623 * Finally, assign it to the start array; the work item will
624 * collect it and move it to the normal array.
626 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
628 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
630 /* this flow continues off the work */
632 spin_unlock_bh(&sta->lock);
635 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
637 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
638 struct sta_info *sta, u16 tid)
640 struct tid_ampdu_tx *tid_tx;
642 lockdep_assert_held(&sta->ampdu_mlme.mtx);
644 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
646 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
649 drv_ampdu_action(local, sta->sdata,
650 IEEE80211_AMPDU_TX_OPERATIONAL,
651 &sta->sta, tid, NULL, tid_tx->buf_size);
654 * synchronize with TX path, while splicing the TX path
655 * should block so it won't put more packets onto pending.
657 spin_lock_bh(&sta->lock);
659 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
661 * Now mark as operational. This will be visible
662 * in the TX path, and lets it go lock-free in
665 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
666 ieee80211_agg_splice_finish(sta->sdata, tid);
668 spin_unlock_bh(&sta->lock);
671 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
673 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
674 struct ieee80211_local *local = sdata->local;
675 struct sta_info *sta;
676 struct tid_ampdu_tx *tid_tx;
678 trace_api_start_tx_ba_cb(sdata, ra, tid);
680 if (tid >= IEEE80211_NUM_TIDS) {
681 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
682 tid, IEEE80211_NUM_TIDS);
686 mutex_lock(&local->sta_mtx);
687 sta = sta_info_get_bss(sdata, ra);
689 mutex_unlock(&local->sta_mtx);
690 ht_dbg(sdata, "Could not find station: %pM\n", ra);
694 mutex_lock(&sta->ampdu_mlme.mtx);
695 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
697 if (WARN_ON(!tid_tx)) {
698 ht_dbg(sdata, "addBA was not requested!\n");
702 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
705 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
706 ieee80211_agg_tx_operational(local, sta, tid);
709 mutex_unlock(&sta->ampdu_mlme.mtx);
710 mutex_unlock(&local->sta_mtx);
713 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
714 const u8 *ra, u16 tid)
716 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
717 struct ieee80211_local *local = sdata->local;
718 struct ieee80211_ra_tid *ra_tid;
719 struct sk_buff *skb = dev_alloc_skb(0);
724 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
725 memcpy(&ra_tid->ra, ra, ETH_ALEN);
728 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
729 skb_queue_tail(&sdata->skb_queue, skb);
730 ieee80211_queue_work(&local->hw, &sdata->work);
732 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
734 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
735 enum ieee80211_agg_stop_reason reason)
739 mutex_lock(&sta->ampdu_mlme.mtx);
741 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
743 mutex_unlock(&sta->ampdu_mlme.mtx);
748 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
750 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
751 struct ieee80211_sub_if_data *sdata = sta->sdata;
752 struct ieee80211_local *local = sdata->local;
753 struct tid_ampdu_tx *tid_tx;
756 trace_api_stop_tx_ba_session(pubsta, tid);
758 if (!local->ops->ampdu_action)
761 if (tid >= IEEE80211_NUM_TIDS)
764 spin_lock_bh(&sta->lock);
765 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
772 WARN(sta->reserved_tid == tid,
773 "Requested to stop BA session on reserved tid=%d", tid);
775 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
776 /* already in progress stopping it */
781 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
782 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
785 spin_unlock_bh(&sta->lock);
788 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
790 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
792 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
793 struct ieee80211_local *local = sdata->local;
794 struct sta_info *sta;
795 struct tid_ampdu_tx *tid_tx;
797 trace_api_stop_tx_ba_cb(sdata, ra, tid);
799 if (tid >= IEEE80211_NUM_TIDS) {
800 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
801 tid, IEEE80211_NUM_TIDS);
805 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid);
807 mutex_lock(&local->sta_mtx);
809 sta = sta_info_get_bss(sdata, ra);
811 ht_dbg(sdata, "Could not find station: %pM\n", ra);
815 mutex_lock(&sta->ampdu_mlme.mtx);
816 spin_lock_bh(&sta->lock);
817 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
819 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
821 "unexpected callback to A-MPDU stop for %pM tid %d\n",
826 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
827 ieee80211_send_delba(sta->sdata, ra, tid,
828 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
830 ieee80211_remove_tid_tx(sta, tid);
833 spin_unlock_bh(&sta->lock);
834 mutex_unlock(&sta->ampdu_mlme.mtx);
836 mutex_unlock(&local->sta_mtx);
839 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
840 const u8 *ra, u16 tid)
842 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
843 struct ieee80211_local *local = sdata->local;
844 struct ieee80211_ra_tid *ra_tid;
845 struct sk_buff *skb = dev_alloc_skb(0);
850 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
851 memcpy(&ra_tid->ra, ra, ETH_ALEN);
854 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
855 skb_queue_tail(&sdata->skb_queue, skb);
856 ieee80211_queue_work(&local->hw, &sdata->work);
858 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
861 void ieee80211_process_addba_resp(struct ieee80211_local *local,
862 struct sta_info *sta,
863 struct ieee80211_mgmt *mgmt,
866 struct tid_ampdu_tx *tid_tx;
870 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
871 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
872 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
874 mutex_lock(&sta->ampdu_mlme.mtx);
876 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
880 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
881 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
886 del_timer_sync(&tid_tx->addba_resp_timer);
888 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
892 * addba_resp_timer may have fired before we got here, and
893 * caused WANT_STOP to be set. If the stop then was already
894 * processed further, STOPPING might be set.
896 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
897 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
899 "got addBA resp for %pM tid %d but we already gave up\n",
905 * IEEE 802.11-2007 7.3.1.14:
906 * In an ADDBA Response frame, when the Status Code field
907 * is set to 0, the Buffer Size subfield is set to a value
910 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
911 == WLAN_STATUS_SUCCESS && buf_size) {
912 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
914 /* ignore duplicate response */
918 tid_tx->buf_size = buf_size;
920 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
921 ieee80211_agg_tx_operational(local, sta, tid);
923 sta->ampdu_mlme.addba_req_num[tid] = 0;
925 if (tid_tx->timeout) {
926 mod_timer(&tid_tx->session_timer,
927 TU_TO_EXP_TIME(tid_tx->timeout));
928 tid_tx->last_tx = jiffies;
932 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
936 mutex_unlock(&sta->ampdu_mlme.mtx);