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
11 * Copyright (C) 2018 Intel Corporation
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
18 #include <linux/ieee80211.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
27 * DOC: TX A-MPDU aggregation
29 * Aggregation on the TX side requires setting the hardware flag
30 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
31 * packets with a flag indicating A-MPDU aggregation. The driver
32 * or device is responsible for actually aggregating the frames,
33 * as well as deciding how many and which to aggregate.
35 * When TX aggregation is started by some subsystem (usually the rate
36 * control algorithm would be appropriate) by calling the
37 * ieee80211_start_tx_ba_session() function, the driver will be
38 * notified via its @ampdu_action function, with the
39 * %IEEE80211_AMPDU_TX_START action.
41 * In response to that, the driver is later required to call the
42 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
43 * start the aggregation session after the peer has also responded.
44 * If the peer responds negatively, the session will be stopped
45 * again right away. Note that it is possible for the aggregation
46 * session to be stopped before the driver has indicated that it
47 * is done setting it up, in which case it must not indicate the
50 * Also note that, since we also need to wait for a response from
51 * the peer, the driver is notified of the completion of the
52 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
53 * @ampdu_action callback.
55 * Similarly, when the aggregation session is stopped by the peer
56 * or something calling ieee80211_stop_tx_ba_session(), the driver's
57 * @ampdu_action function will be called with the action
58 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
59 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
60 * Note that the sta can get destroyed before the BA tear down is
64 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
65 const u8 *da, u16 tid,
66 u8 dialog_token, u16 start_seq_num,
67 u16 agg_size, u16 timeout)
69 struct ieee80211_local *local = sdata->local;
71 struct ieee80211_mgmt *mgmt;
74 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
79 skb_reserve(skb, local->hw.extra_tx_headroom);
80 mgmt = skb_put_zero(skb, 24);
81 memcpy(mgmt->da, da, ETH_ALEN);
82 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
83 if (sdata->vif.type == NL80211_IFTYPE_AP ||
84 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
85 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
86 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
87 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
88 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
89 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
90 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
92 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
93 IEEE80211_STYPE_ACTION);
95 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
97 mgmt->u.action.category = WLAN_CATEGORY_BACK;
98 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
100 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
101 capab = (u16)(1 << 0); /* bit 0 A-MSDU support */
102 capab |= (u16)(1 << 1); /* bit 1 aggregation policy */
103 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
104 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
106 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
108 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
109 mgmt->u.action.u.addba_req.start_seq_num =
110 cpu_to_le16(start_seq_num << 4);
112 ieee80211_tx_skb(sdata, skb);
115 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
117 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
118 struct ieee80211_local *local = sdata->local;
120 struct ieee80211_bar *bar;
123 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
127 skb_reserve(skb, local->hw.extra_tx_headroom);
128 bar = skb_put_zero(skb, sizeof(*bar));
129 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
130 IEEE80211_STYPE_BACK_REQ);
131 memcpy(bar->ra, ra, ETH_ALEN);
132 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
133 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
134 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
135 bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
136 bar->control = cpu_to_le16(bar_control);
137 bar->start_seq_num = cpu_to_le16(ssn);
139 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
140 IEEE80211_TX_CTL_REQ_TX_STATUS;
141 ieee80211_tx_skb_tid(sdata, skb, tid);
143 EXPORT_SYMBOL(ieee80211_send_bar);
145 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
146 struct tid_ampdu_tx *tid_tx)
148 lockdep_assert_held(&sta->ampdu_mlme.mtx);
149 lockdep_assert_held(&sta->lock);
150 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
154 * When multiple aggregation sessions on multiple stations
155 * are being created/destroyed simultaneously, we need to
156 * refcount the global queue stop caused by that in order
157 * to not get into a situation where one of the aggregation
158 * setup or teardown re-enables queues before the other is
159 * ready to handle that.
161 * These two functions take care of this issue by keeping
162 * a global "agg_queue_stop" refcount.
164 static void __acquires(agg_queue)
165 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
167 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
169 /* we do refcounting here, so don't use the queue reason refcounting */
171 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
172 ieee80211_stop_queue_by_reason(
173 &sdata->local->hw, queue,
174 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
176 __acquire(agg_queue);
179 static void __releases(agg_queue)
180 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
182 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
184 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
185 ieee80211_wake_queue_by_reason(
186 &sdata->local->hw, queue,
187 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
189 __release(agg_queue);
193 ieee80211_agg_stop_txq(struct sta_info *sta, int tid)
195 struct ieee80211_txq *txq = sta->sta.txq[tid];
196 struct ieee80211_sub_if_data *sdata;
198 struct txq_info *txqi;
203 txqi = to_txq_info(txq);
204 sdata = vif_to_sdata(txq->vif);
205 fq = &sdata->local->fq;
207 /* Lock here to protect against further seqno updates on dequeue */
208 spin_lock_bh(&fq->lock);
209 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
210 spin_unlock_bh(&fq->lock);
214 ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable)
216 struct ieee80211_txq *txq = sta->sta.txq[tid];
217 struct txq_info *txqi;
222 txqi = to_txq_info(txq);
225 set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
227 clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
229 clear_bit(IEEE80211_TXQ_STOP, &txqi->flags);
232 drv_wake_tx_queue(sta->sdata->local, txqi);
238 * splice packets from the STA's pending to the local pending,
239 * requires a call to ieee80211_agg_splice_finish later
241 static void __acquires(agg_queue)
242 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
243 struct tid_ampdu_tx *tid_tx, u16 tid)
245 struct ieee80211_local *local = sdata->local;
246 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
249 ieee80211_stop_queue_agg(sdata, tid);
252 "TID %d gone but expected when splicing aggregates from the pending queue\n",
256 if (!skb_queue_empty(&tid_tx->pending)) {
257 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
258 /* copy over remaining packets */
259 skb_queue_splice_tail_init(&tid_tx->pending,
260 &local->pending[queue]);
261 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
265 static void __releases(agg_queue)
266 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
268 ieee80211_wake_queue_agg(sdata, tid);
271 static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
273 struct tid_ampdu_tx *tid_tx;
275 lockdep_assert_held(&sta->ampdu_mlme.mtx);
276 lockdep_assert_held(&sta->lock);
278 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
281 * When we get here, the TX path will not be lockless any more wrt.
282 * aggregation, since the OPERATIONAL bit has long been cleared.
283 * Thus it will block on getting the lock, if it occurs. So if we
284 * stop the queue now, we will not get any more packets, and any
285 * that might be being processed will wait for us here, thereby
286 * guaranteeing that no packets go to the tid_tx pending queue any
290 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
292 /* future packets must not find the tid_tx struct any more */
293 ieee80211_assign_tid_tx(sta, tid, NULL);
295 ieee80211_agg_splice_finish(sta->sdata, tid);
296 ieee80211_agg_start_txq(sta, tid, false);
298 kfree_rcu(tid_tx, rcu_head);
301 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
302 enum ieee80211_agg_stop_reason reason)
304 struct ieee80211_local *local = sta->local;
305 struct tid_ampdu_tx *tid_tx;
306 struct ieee80211_ampdu_params params = {
316 lockdep_assert_held(&sta->ampdu_mlme.mtx);
319 case AGG_STOP_DECLINED:
320 case AGG_STOP_LOCAL_REQUEST:
321 case AGG_STOP_PEER_REQUEST:
322 params.action = IEEE80211_AMPDU_TX_STOP_CONT;
324 case AGG_STOP_DESTROY_STA:
325 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
332 spin_lock_bh(&sta->lock);
334 /* free struct pending for start, if present */
335 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
337 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
339 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
341 spin_unlock_bh(&sta->lock);
346 * if we're already stopping ignore any new requests to stop
347 * unless we're destroying it in which case notify the driver
349 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
350 spin_unlock_bh(&sta->lock);
351 if (reason != AGG_STOP_DESTROY_STA)
353 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
354 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
359 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
360 /* not even started yet! */
361 ieee80211_assign_tid_tx(sta, tid, NULL);
362 spin_unlock_bh(&sta->lock);
363 kfree_rcu(tid_tx, rcu_head);
367 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
369 spin_unlock_bh(&sta->lock);
371 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
374 del_timer_sync(&tid_tx->addba_resp_timer);
375 del_timer_sync(&tid_tx->session_timer);
378 * After this packets are no longer handed right through
379 * to the driver but are put onto tid_tx->pending instead,
380 * with locking to ensure proper access.
382 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
385 * There might be a few packets being processed right now (on
386 * another CPU) that have already gotten past the aggregation
387 * check when it was still OPERATIONAL and consequently have
388 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
389 * call into the driver at the same time or even before the
390 * TX paths calls into it, which could confuse the driver.
392 * Wait for all currently running TX paths to finish before
393 * telling the driver. New packets will not go through since
394 * the aggregation session is no longer OPERATIONAL.
396 if (!local->in_reconfig)
399 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
400 WLAN_BACK_RECIPIENT :
402 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
404 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
406 /* HW shall not deny going back to legacy */
409 * We may have pending packets get stuck in this case...
410 * Not bothering with a workaround for now.
415 * In the case of AGG_STOP_DESTROY_STA, the driver won't
416 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
417 * seem like we can leave the tid_tx data pending forever.
418 * This is true, in a way, but "forever" is only until the
419 * station struct is actually destroyed. In the meantime,
420 * leaving it around ensures that we don't transmit packets
421 * to the driver on this TID which might confuse it.
428 * After sending add Block Ack request we activated a timer until
429 * add Block Ack response will arrive from the recipient.
430 * If this timer expires sta_addba_resp_timer_expired will be executed.
432 static void sta_addba_resp_timer_expired(struct timer_list *t)
434 struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer);
435 struct sta_info *sta = tid_tx->sta;
436 u8 tid = tid_tx->tid;
438 /* check if the TID waits for addBA response */
439 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
441 "timer expired on %pM tid %d not expecting addBA response\n",
446 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
449 ieee80211_stop_tx_ba_session(&sta->sta, tid);
452 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
454 struct tid_ampdu_tx *tid_tx;
455 struct ieee80211_local *local = sta->local;
456 struct ieee80211_sub_if_data *sdata = sta->sdata;
457 struct ieee80211_ampdu_params params = {
459 .action = IEEE80211_AMPDU_TX_START,
467 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
470 * Start queuing up packets for this aggregation session.
471 * We're going to release them once the driver is OK with
474 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
476 ieee80211_agg_stop_txq(sta, tid);
479 * Make sure no packets are being processed. This ensures that
480 * we have a valid starting sequence number and that in-flight
481 * packets have been flushed out and no packets for this TID
482 * will go into the driver during the ampdu_action call.
486 params.ssn = sta->tid_seq[tid] >> 4;
487 ret = drv_ampdu_action(local, sdata, ¶ms);
490 "BA request denied - HW unavailable for %pM tid %d\n",
492 spin_lock_bh(&sta->lock);
493 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
494 ieee80211_assign_tid_tx(sta, tid, NULL);
495 ieee80211_agg_splice_finish(sdata, tid);
496 spin_unlock_bh(&sta->lock);
498 ieee80211_agg_start_txq(sta, tid, false);
500 kfree_rcu(tid_tx, rcu_head);
504 /* activate the timer for the recipient's addBA response */
505 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
506 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
509 spin_lock_bh(&sta->lock);
510 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
511 sta->ampdu_mlme.addba_req_num[tid]++;
512 spin_unlock_bh(&sta->lock);
514 /* send AddBA request */
515 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
516 tid_tx->dialog_token, params.ssn,
517 IEEE80211_MAX_AMPDU_BUF,
522 * After accepting the AddBA Response we activated a timer,
523 * resetting it after each frame that we send.
525 static void sta_tx_agg_session_timer_expired(struct timer_list *t)
527 struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer);
528 struct sta_info *sta = tid_tx->sta;
529 u8 tid = tid_tx->tid;
530 unsigned long timeout;
532 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
536 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
537 if (time_is_after_jiffies(timeout)) {
538 mod_timer(&tid_tx->session_timer, timeout);
542 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
545 ieee80211_stop_tx_ba_session(&sta->sta, tid);
548 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
551 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
552 struct ieee80211_sub_if_data *sdata = sta->sdata;
553 struct ieee80211_local *local = sdata->local;
554 struct tid_ampdu_tx *tid_tx;
557 trace_api_start_tx_ba_session(pubsta, tid);
559 if (WARN(sta->reserved_tid == tid,
560 "Requested to start BA session on reserved tid=%d", tid))
563 if (!pubsta->ht_cap.ht_supported)
566 if (WARN_ON_ONCE(!local->ops->ampdu_action))
569 if ((tid >= IEEE80211_NUM_TIDS) ||
570 !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
571 ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
574 if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
577 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
580 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
581 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
582 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
583 sdata->vif.type != NL80211_IFTYPE_AP &&
584 sdata->vif.type != NL80211_IFTYPE_ADHOC)
587 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
589 "BA sessions blocked - Denying BA session request %pM tid %d\n",
595 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
596 * member of an IBSS, and has no other existing Block Ack agreement
597 * with the recipient STA, then the initiating STA shall transmit a
598 * Probe Request frame to the recipient STA and shall not transmit an
599 * ADDBA Request frame unless it receives a Probe Response frame
600 * from the recipient within dot11ADDBAFailureTimeout.
602 * The probe request mechanism for ADDBA is currently not implemented,
603 * but we only build up Block Ack session with HT STAs. This information
604 * is set when we receive a bss info from a probe response or a beacon.
606 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
607 !sta->sta.ht_cap.ht_supported) {
609 "BA request denied - IBSS STA %pM does not advertise HT support\n",
614 spin_lock_bh(&sta->lock);
616 /* we have tried too many times, receiver does not want A-MPDU */
617 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
623 * if we have tried more than HT_AGG_BURST_RETRIES times we
624 * will spread our requests in time to avoid stalling connection
627 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
628 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
629 HT_AGG_RETRIES_PERIOD)) {
631 "BA request denied - %d failed requests on %pM tid %u\n",
632 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
637 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
638 /* check if the TID is not in aggregation flow already */
639 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
641 "BA request denied - session is not idle on %pM tid %u\n",
647 /* prepare A-MPDU MLME for Tx aggregation */
648 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
654 skb_queue_head_init(&tid_tx->pending);
655 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
657 tid_tx->timeout = timeout;
662 timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
665 timer_setup(&tid_tx->session_timer,
666 sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
668 /* assign a dialog token */
669 sta->ampdu_mlme.dialog_token_allocator++;
670 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
673 * Finally, assign it to the start array; the work item will
674 * collect it and move it to the normal array.
676 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
678 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
680 /* this flow continues off the work */
682 spin_unlock_bh(&sta->lock);
685 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
687 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
688 struct sta_info *sta, u16 tid)
690 struct tid_ampdu_tx *tid_tx;
691 struct ieee80211_ampdu_params params = {
693 .action = IEEE80211_AMPDU_TX_OPERATIONAL,
699 lockdep_assert_held(&sta->ampdu_mlme.mtx);
701 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
702 params.buf_size = tid_tx->buf_size;
703 params.amsdu = tid_tx->amsdu;
705 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
708 drv_ampdu_action(local, sta->sdata, ¶ms);
711 * synchronize with TX path, while splicing the TX path
712 * should block so it won't put more packets onto pending.
714 spin_lock_bh(&sta->lock);
716 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
718 * Now mark as operational. This will be visible
719 * in the TX path, and lets it go lock-free in
722 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
723 ieee80211_agg_splice_finish(sta->sdata, tid);
725 spin_unlock_bh(&sta->lock);
727 ieee80211_agg_start_txq(sta, tid, true);
730 void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid,
731 struct tid_ampdu_tx *tid_tx)
733 struct ieee80211_sub_if_data *sdata = sta->sdata;
734 struct ieee80211_local *local = sdata->local;
736 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
739 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
740 ieee80211_agg_tx_operational(local, sta, tid);
743 static struct tid_ampdu_tx *
744 ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata,
745 const u8 *ra, u16 tid, struct sta_info **sta)
747 struct tid_ampdu_tx *tid_tx;
749 if (tid >= IEEE80211_NUM_TIDS) {
750 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
751 tid, IEEE80211_NUM_TIDS);
755 *sta = sta_info_get_bss(sdata, ra);
757 ht_dbg(sdata, "Could not find station: %pM\n", ra);
761 tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]);
763 if (WARN_ON(!tid_tx))
764 ht_dbg(sdata, "addBA was not requested!\n");
769 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
770 const u8 *ra, u16 tid)
772 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
773 struct ieee80211_local *local = sdata->local;
774 struct sta_info *sta;
775 struct tid_ampdu_tx *tid_tx;
777 trace_api_start_tx_ba_cb(sdata, ra, tid);
780 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
784 set_bit(HT_AGG_STATE_START_CB, &tid_tx->state);
785 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
789 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
791 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
792 enum ieee80211_agg_stop_reason reason)
796 mutex_lock(&sta->ampdu_mlme.mtx);
798 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
800 mutex_unlock(&sta->ampdu_mlme.mtx);
805 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
807 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
808 struct ieee80211_sub_if_data *sdata = sta->sdata;
809 struct ieee80211_local *local = sdata->local;
810 struct tid_ampdu_tx *tid_tx;
813 trace_api_stop_tx_ba_session(pubsta, tid);
815 if (!local->ops->ampdu_action)
818 if (tid >= IEEE80211_NUM_TIDS)
821 spin_lock_bh(&sta->lock);
822 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
829 WARN(sta->reserved_tid == tid,
830 "Requested to stop BA session on reserved tid=%d", tid);
832 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
833 /* already in progress stopping it */
838 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
839 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
842 spin_unlock_bh(&sta->lock);
845 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
847 void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid,
848 struct tid_ampdu_tx *tid_tx)
850 struct ieee80211_sub_if_data *sdata = sta->sdata;
851 bool send_delba = false;
853 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n",
856 spin_lock_bh(&sta->lock);
858 if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
860 "unexpected callback to A-MPDU stop for %pM tid %d\n",
865 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
868 ieee80211_remove_tid_tx(sta, tid);
871 spin_unlock_bh(&sta->lock);
874 ieee80211_send_delba(sdata, sta->sta.addr, tid,
875 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
878 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
879 const u8 *ra, u16 tid)
881 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
882 struct ieee80211_local *local = sdata->local;
883 struct sta_info *sta;
884 struct tid_ampdu_tx *tid_tx;
886 trace_api_stop_tx_ba_cb(sdata, ra, tid);
889 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
893 set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state);
894 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
898 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
901 void ieee80211_process_addba_resp(struct ieee80211_local *local,
902 struct sta_info *sta,
903 struct ieee80211_mgmt *mgmt,
906 struct tid_ampdu_tx *tid_tx;
907 struct ieee80211_txq *txq;
912 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
913 amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
914 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
915 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
916 buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
918 txq = sta->sta.txq[tid];
920 set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
922 mutex_lock(&sta->ampdu_mlme.mtx);
924 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
928 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
929 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
934 del_timer_sync(&tid_tx->addba_resp_timer);
936 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
940 * addba_resp_timer may have fired before we got here, and
941 * caused WANT_STOP to be set. If the stop then was already
942 * processed further, STOPPING might be set.
944 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
945 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
947 "got addBA resp for %pM tid %d but we already gave up\n",
953 * IEEE 802.11-2007 7.3.1.14:
954 * In an ADDBA Response frame, when the Status Code field
955 * is set to 0, the Buffer Size subfield is set to a value
958 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
959 == WLAN_STATUS_SUCCESS && buf_size) {
960 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
962 /* ignore duplicate response */
966 tid_tx->buf_size = buf_size;
967 tid_tx->amsdu = amsdu;
969 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
970 ieee80211_agg_tx_operational(local, sta, tid);
972 sta->ampdu_mlme.addba_req_num[tid] = 0;
975 le16_to_cpu(mgmt->u.action.u.addba_resp.timeout);
977 if (tid_tx->timeout) {
978 mod_timer(&tid_tx->session_timer,
979 TU_TO_EXP_TIME(tid_tx->timeout));
980 tid_tx->last_tx = jiffies;
984 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
988 mutex_unlock(&sta->ampdu_mlme.mtx);