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
10 * Copyright(c) 2015-2017 Intel Deutschland GmbH
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #include <linux/ieee80211.h>
18 #include <linux/slab.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
26 * DOC: TX A-MPDU aggregation
28 * Aggregation on the TX side requires setting the hardware flag
29 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
30 * packets with a flag indicating A-MPDU aggregation. The driver
31 * or device is responsible for actually aggregating the frames,
32 * as well as deciding how many and which to aggregate.
34 * When TX aggregation is started by some subsystem (usually the rate
35 * control algorithm would be appropriate) by calling the
36 * ieee80211_start_tx_ba_session() function, the driver will be
37 * notified via its @ampdu_action function, with the
38 * %IEEE80211_AMPDU_TX_START action.
40 * In response to that, the driver is later required to call the
41 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
42 * start the aggregation session after the peer has also responded.
43 * If the peer responds negatively, the session will be stopped
44 * again right away. Note that it is possible for the aggregation
45 * session to be stopped before the driver has indicated that it
46 * is done setting it up, in which case it must not indicate the
49 * Also note that, since we also need to wait for a response from
50 * the peer, the driver is notified of the completion of the
51 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
52 * @ampdu_action callback.
54 * Similarly, when the aggregation session is stopped by the peer
55 * or something calling ieee80211_stop_tx_ba_session(), the driver's
56 * @ampdu_action function will be called with the action
57 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
58 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
59 * Note that the sta can get destroyed before the BA tear down is
63 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
64 const u8 *da, u16 tid,
65 u8 dialog_token, u16 start_seq_num,
66 u16 agg_size, u16 timeout)
68 struct ieee80211_local *local = sdata->local;
70 struct ieee80211_mgmt *mgmt;
73 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
78 skb_reserve(skb, local->hw.extra_tx_headroom);
79 mgmt = skb_put_zero(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 << 0); /* bit 0 A-MSDU support */
101 capab |= (u16)(1 << 1); /* bit 1 aggregation policy */
102 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
103 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
105 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
107 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
108 mgmt->u.action.u.addba_req.start_seq_num =
109 cpu_to_le16(start_seq_num << 4);
111 ieee80211_tx_skb(sdata, skb);
114 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
116 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
117 struct ieee80211_local *local = sdata->local;
119 struct ieee80211_bar *bar;
122 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
126 skb_reserve(skb, local->hw.extra_tx_headroom);
127 bar = skb_put_zero(skb, 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 ieee80211_agg_stop_txq(struct sta_info *sta, int tid)
194 struct ieee80211_txq *txq = sta->sta.txq[tid];
195 struct ieee80211_sub_if_data *sdata;
197 struct txq_info *txqi;
202 txqi = to_txq_info(txq);
203 sdata = vif_to_sdata(txq->vif);
204 fq = &sdata->local->fq;
206 /* Lock here to protect against further seqno updates on dequeue */
207 spin_lock_bh(&fq->lock);
208 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
209 spin_unlock_bh(&fq->lock);
213 ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable)
215 struct ieee80211_txq *txq = sta->sta.txq[tid];
216 struct txq_info *txqi;
221 txqi = to_txq_info(txq);
224 set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
226 clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
228 clear_bit(IEEE80211_TXQ_STOP, &txqi->flags);
231 drv_wake_tx_queue(sta->sdata->local, txqi);
237 * splice packets from the STA's pending to the local pending,
238 * requires a call to ieee80211_agg_splice_finish later
240 static void __acquires(agg_queue)
241 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
242 struct tid_ampdu_tx *tid_tx, u16 tid)
244 struct ieee80211_local *local = sdata->local;
245 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
248 ieee80211_stop_queue_agg(sdata, tid);
251 "TID %d gone but expected when splicing aggregates from the pending queue\n",
255 if (!skb_queue_empty(&tid_tx->pending)) {
256 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
257 /* copy over remaining packets */
258 skb_queue_splice_tail_init(&tid_tx->pending,
259 &local->pending[queue]);
260 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
264 static void __releases(agg_queue)
265 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
267 ieee80211_wake_queue_agg(sdata, tid);
270 static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
272 struct tid_ampdu_tx *tid_tx;
274 lockdep_assert_held(&sta->ampdu_mlme.mtx);
275 lockdep_assert_held(&sta->lock);
277 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
280 * When we get here, the TX path will not be lockless any more wrt.
281 * aggregation, since the OPERATIONAL bit has long been cleared.
282 * Thus it will block on getting the lock, if it occurs. So if we
283 * stop the queue now, we will not get any more packets, and any
284 * that might be being processed will wait for us here, thereby
285 * guaranteeing that no packets go to the tid_tx pending queue any
289 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
291 /* future packets must not find the tid_tx struct any more */
292 ieee80211_assign_tid_tx(sta, tid, NULL);
294 ieee80211_agg_splice_finish(sta->sdata, tid);
295 ieee80211_agg_start_txq(sta, tid, false);
297 kfree_rcu(tid_tx, rcu_head);
300 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
301 enum ieee80211_agg_stop_reason reason)
303 struct ieee80211_local *local = sta->local;
304 struct tid_ampdu_tx *tid_tx;
305 struct ieee80211_ampdu_params params = {
315 lockdep_assert_held(&sta->ampdu_mlme.mtx);
318 case AGG_STOP_DECLINED:
319 case AGG_STOP_LOCAL_REQUEST:
320 case AGG_STOP_PEER_REQUEST:
321 params.action = IEEE80211_AMPDU_TX_STOP_CONT;
323 case AGG_STOP_DESTROY_STA:
324 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
331 spin_lock_bh(&sta->lock);
333 /* free struct pending for start, if present */
334 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
336 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
338 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
340 spin_unlock_bh(&sta->lock);
345 * if we're already stopping ignore any new requests to stop
346 * unless we're destroying it in which case notify the driver
348 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
349 spin_unlock_bh(&sta->lock);
350 if (reason != AGG_STOP_DESTROY_STA)
352 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
353 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
358 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
359 /* not even started yet! */
360 ieee80211_assign_tid_tx(sta, tid, NULL);
361 spin_unlock_bh(&sta->lock);
362 kfree_rcu(tid_tx, rcu_head);
366 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
368 spin_unlock_bh(&sta->lock);
370 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
373 del_timer_sync(&tid_tx->addba_resp_timer);
374 del_timer_sync(&tid_tx->session_timer);
377 * After this packets are no longer handed right through
378 * to the driver but are put onto tid_tx->pending instead,
379 * with locking to ensure proper access.
381 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
384 * There might be a few packets being processed right now (on
385 * another CPU) that have already gotten past the aggregation
386 * check when it was still OPERATIONAL and consequently have
387 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
388 * call into the driver at the same time or even before the
389 * TX paths calls into it, which could confuse the driver.
391 * Wait for all currently running TX paths to finish before
392 * telling the driver. New packets will not go through since
393 * the aggregation session is no longer OPERATIONAL.
397 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
398 WLAN_BACK_RECIPIENT :
400 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
402 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
404 /* HW shall not deny going back to legacy */
407 * We may have pending packets get stuck in this case...
408 * Not bothering with a workaround for now.
413 * In the case of AGG_STOP_DESTROY_STA, the driver won't
414 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
415 * seem like we can leave the tid_tx data pending forever.
416 * This is true, in a way, but "forever" is only until the
417 * station struct is actually destroyed. In the meantime,
418 * leaving it around ensures that we don't transmit packets
419 * to the driver on this TID which might confuse it.
426 * After sending add Block Ack request we activated a timer until
427 * add Block Ack response will arrive from the recipient.
428 * If this timer expires sta_addba_resp_timer_expired will be executed.
430 static void sta_addba_resp_timer_expired(struct timer_list *t)
432 struct tid_ampdu_tx *tid_tx_timer =
433 from_timer(tid_tx_timer, t, addba_resp_timer);
434 struct sta_info *sta = tid_tx_timer->sta;
435 u8 tid = tid_tx_timer->tid;
436 struct tid_ampdu_tx *tid_tx;
438 /* check if the TID waits for addBA response */
440 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
442 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
445 "timer expired on %pM tid %d not expecting addBA response\n",
450 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
453 ieee80211_stop_tx_ba_session(&sta->sta, tid);
457 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
459 struct tid_ampdu_tx *tid_tx;
460 struct ieee80211_local *local = sta->local;
461 struct ieee80211_sub_if_data *sdata = sta->sdata;
462 struct ieee80211_ampdu_params params = {
464 .action = IEEE80211_AMPDU_TX_START,
472 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
475 * Start queuing up packets for this aggregation session.
476 * We're going to release them once the driver is OK with
479 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
481 ieee80211_agg_stop_txq(sta, tid);
484 * Make sure no packets are being processed. This ensures that
485 * we have a valid starting sequence number and that in-flight
486 * packets have been flushed out and no packets for this TID
487 * will go into the driver during the ampdu_action call.
491 params.ssn = sta->tid_seq[tid] >> 4;
492 ret = drv_ampdu_action(local, sdata, ¶ms);
495 "BA request denied - HW unavailable for %pM tid %d\n",
497 spin_lock_bh(&sta->lock);
498 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
499 ieee80211_assign_tid_tx(sta, tid, NULL);
500 ieee80211_agg_splice_finish(sdata, tid);
501 spin_unlock_bh(&sta->lock);
503 ieee80211_agg_start_txq(sta, tid, false);
505 kfree_rcu(tid_tx, rcu_head);
509 /* activate the timer for the recipient's addBA response */
510 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
511 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
514 spin_lock_bh(&sta->lock);
515 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
516 sta->ampdu_mlme.addba_req_num[tid]++;
517 spin_unlock_bh(&sta->lock);
519 /* send AddBA request */
520 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
521 tid_tx->dialog_token, params.ssn,
522 IEEE80211_MAX_AMPDU_BUF,
527 * After accepting the AddBA Response we activated a timer,
528 * resetting it after each frame that we send.
530 static void sta_tx_agg_session_timer_expired(struct timer_list *t)
532 struct tid_ampdu_tx *tid_tx_timer =
533 from_timer(tid_tx_timer, t, session_timer);
534 struct sta_info *sta = tid_tx_timer->sta;
535 u8 tid = tid_tx_timer->tid;
536 struct tid_ampdu_tx *tid_tx;
537 unsigned long timeout;
540 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
541 if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
546 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
547 if (time_is_after_jiffies(timeout)) {
548 mod_timer(&tid_tx->session_timer, timeout);
555 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
558 ieee80211_stop_tx_ba_session(&sta->sta, tid);
561 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
564 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
565 struct ieee80211_sub_if_data *sdata = sta->sdata;
566 struct ieee80211_local *local = sdata->local;
567 struct tid_ampdu_tx *tid_tx;
570 trace_api_start_tx_ba_session(pubsta, tid);
572 if (WARN(sta->reserved_tid == tid,
573 "Requested to start BA session on reserved tid=%d", tid))
576 if (!pubsta->ht_cap.ht_supported)
579 if (WARN_ON_ONCE(!local->ops->ampdu_action))
582 if ((tid >= IEEE80211_NUM_TIDS) ||
583 !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
584 ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
587 if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
590 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
593 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
594 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
595 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
596 sdata->vif.type != NL80211_IFTYPE_AP &&
597 sdata->vif.type != NL80211_IFTYPE_ADHOC)
600 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
602 "BA sessions blocked - Denying BA session request %pM tid %d\n",
608 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
609 * member of an IBSS, and has no other existing Block Ack agreement
610 * with the recipient STA, then the initiating STA shall transmit a
611 * Probe Request frame to the recipient STA and shall not transmit an
612 * ADDBA Request frame unless it receives a Probe Response frame
613 * from the recipient within dot11ADDBAFailureTimeout.
615 * The probe request mechanism for ADDBA is currently not implemented,
616 * but we only build up Block Ack session with HT STAs. This information
617 * is set when we receive a bss info from a probe response or a beacon.
619 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
620 !sta->sta.ht_cap.ht_supported) {
622 "BA request denied - IBSS STA %pM does not advertise HT support\n",
627 spin_lock_bh(&sta->lock);
629 /* we have tried too many times, receiver does not want A-MPDU */
630 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
636 * if we have tried more than HT_AGG_BURST_RETRIES times we
637 * will spread our requests in time to avoid stalling connection
640 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
641 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
642 HT_AGG_RETRIES_PERIOD)) {
644 "BA request denied - %d failed requests on %pM tid %u\n",
645 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
650 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
651 /* check if the TID is not in aggregation flow already */
652 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
654 "BA request denied - session is not idle on %pM tid %u\n",
660 /* prepare A-MPDU MLME for Tx aggregation */
661 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
667 skb_queue_head_init(&tid_tx->pending);
668 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
670 tid_tx->timeout = timeout;
675 timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
678 timer_setup(&tid_tx->session_timer,
679 sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
681 /* assign a dialog token */
682 sta->ampdu_mlme.dialog_token_allocator++;
683 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
686 * Finally, assign it to the start array; the work item will
687 * collect it and move it to the normal array.
689 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
691 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
693 /* this flow continues off the work */
695 spin_unlock_bh(&sta->lock);
698 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
700 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
701 struct sta_info *sta, u16 tid)
703 struct tid_ampdu_tx *tid_tx;
704 struct ieee80211_ampdu_params params = {
706 .action = IEEE80211_AMPDU_TX_OPERATIONAL,
712 lockdep_assert_held(&sta->ampdu_mlme.mtx);
714 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
715 params.buf_size = tid_tx->buf_size;
716 params.amsdu = tid_tx->amsdu;
718 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
721 drv_ampdu_action(local, sta->sdata, ¶ms);
724 * synchronize with TX path, while splicing the TX path
725 * should block so it won't put more packets onto pending.
727 spin_lock_bh(&sta->lock);
729 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
731 * Now mark as operational. This will be visible
732 * in the TX path, and lets it go lock-free in
735 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
736 ieee80211_agg_splice_finish(sta->sdata, tid);
738 spin_unlock_bh(&sta->lock);
740 ieee80211_agg_start_txq(sta, tid, true);
743 void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid,
744 struct tid_ampdu_tx *tid_tx)
746 struct ieee80211_sub_if_data *sdata = sta->sdata;
747 struct ieee80211_local *local = sdata->local;
749 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
752 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
753 ieee80211_agg_tx_operational(local, sta, tid);
756 static struct tid_ampdu_tx *
757 ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata,
758 const u8 *ra, u16 tid, struct sta_info **sta)
760 struct tid_ampdu_tx *tid_tx;
762 if (tid >= IEEE80211_NUM_TIDS) {
763 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
764 tid, IEEE80211_NUM_TIDS);
768 *sta = sta_info_get_bss(sdata, ra);
770 ht_dbg(sdata, "Could not find station: %pM\n", ra);
774 tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]);
776 if (WARN_ON(!tid_tx))
777 ht_dbg(sdata, "addBA was not requested!\n");
782 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
783 const u8 *ra, u16 tid)
785 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
786 struct ieee80211_local *local = sdata->local;
787 struct sta_info *sta;
788 struct tid_ampdu_tx *tid_tx;
790 trace_api_start_tx_ba_cb(sdata, ra, tid);
793 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
797 set_bit(HT_AGG_STATE_START_CB, &tid_tx->state);
798 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
802 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
804 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
805 enum ieee80211_agg_stop_reason reason)
809 mutex_lock(&sta->ampdu_mlme.mtx);
811 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
813 mutex_unlock(&sta->ampdu_mlme.mtx);
818 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
820 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
821 struct ieee80211_sub_if_data *sdata = sta->sdata;
822 struct ieee80211_local *local = sdata->local;
823 struct tid_ampdu_tx *tid_tx;
826 trace_api_stop_tx_ba_session(pubsta, tid);
828 if (!local->ops->ampdu_action)
831 if (tid >= IEEE80211_NUM_TIDS)
834 spin_lock_bh(&sta->lock);
835 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
842 WARN(sta->reserved_tid == tid,
843 "Requested to stop BA session on reserved tid=%d", tid);
845 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
846 /* already in progress stopping it */
851 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
852 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
855 spin_unlock_bh(&sta->lock);
858 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
860 void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid,
861 struct tid_ampdu_tx *tid_tx)
863 struct ieee80211_sub_if_data *sdata = sta->sdata;
864 bool send_delba = false;
866 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n",
869 spin_lock_bh(&sta->lock);
871 if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
873 "unexpected callback to A-MPDU stop for %pM tid %d\n",
878 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
881 ieee80211_remove_tid_tx(sta, tid);
884 spin_unlock_bh(&sta->lock);
887 ieee80211_send_delba(sdata, sta->sta.addr, tid,
888 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
891 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
892 const u8 *ra, u16 tid)
894 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
895 struct ieee80211_local *local = sdata->local;
896 struct sta_info *sta;
897 struct tid_ampdu_tx *tid_tx;
899 trace_api_stop_tx_ba_cb(sdata, ra, tid);
902 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
906 set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state);
907 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
911 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
914 void ieee80211_process_addba_resp(struct ieee80211_local *local,
915 struct sta_info *sta,
916 struct ieee80211_mgmt *mgmt,
919 struct tid_ampdu_tx *tid_tx;
920 struct ieee80211_txq *txq;
925 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
926 amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
927 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
928 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
929 buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
931 txq = sta->sta.txq[tid];
933 set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
935 mutex_lock(&sta->ampdu_mlme.mtx);
937 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
941 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
942 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
947 del_timer_sync(&tid_tx->addba_resp_timer);
949 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
953 * addba_resp_timer may have fired before we got here, and
954 * caused WANT_STOP to be set. If the stop then was already
955 * processed further, STOPPING might be set.
957 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
958 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
960 "got addBA resp for %pM tid %d but we already gave up\n",
966 * IEEE 802.11-2007 7.3.1.14:
967 * In an ADDBA Response frame, when the Status Code field
968 * is set to 0, the Buffer Size subfield is set to a value
971 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
972 == WLAN_STATUS_SUCCESS && buf_size) {
973 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
975 /* ignore duplicate response */
979 tid_tx->buf_size = buf_size;
980 tid_tx->amsdu = amsdu;
982 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
983 ieee80211_agg_tx_operational(local, sta, tid);
985 sta->ampdu_mlme.addba_req_num[tid] = 0;
987 if (tid_tx->timeout) {
988 mod_timer(&tid_tx->session_timer,
989 TU_TO_EXP_TIME(tid_tx->timeout));
990 tid_tx->last_tx = jiffies;
994 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
998 mutex_unlock(&sta->ampdu_mlme.mtx);