1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6 * Copyright 2002-2005, Instant802 Networks, Inc.
7 * Copyright 2005-2006, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * Copyright 2007-2010, Intel Corporation
11 * Copyright(c) 2015-2017 Intel Deutschland GmbH
12 * Copyright (C) 2018 - 2020 Intel Corporation
15 #include <linux/ieee80211.h>
16 #include <linux/slab.h>
17 #include <linux/export.h>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
20 #include "driver-ops.h"
24 * DOC: TX A-MPDU aggregation
26 * Aggregation on the TX side requires setting the hardware flag
27 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
28 * packets with a flag indicating A-MPDU aggregation. The driver
29 * or device is responsible for actually aggregating the frames,
30 * as well as deciding how many and which to aggregate.
32 * When TX aggregation is started by some subsystem (usually the rate
33 * control algorithm would be appropriate) by calling the
34 * ieee80211_start_tx_ba_session() function, the driver will be
35 * notified via its @ampdu_action function, with the
36 * %IEEE80211_AMPDU_TX_START action.
38 * In response to that, the driver is later required to call the
39 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
40 * start the aggregation session after the peer has also responded.
41 * If the peer responds negatively, the session will be stopped
42 * again right away. Note that it is possible for the aggregation
43 * session to be stopped before the driver has indicated that it
44 * is done setting it up, in which case it must not indicate the
47 * Also note that, since we also need to wait for a response from
48 * the peer, the driver is notified of the completion of the
49 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
50 * @ampdu_action callback.
52 * Similarly, when the aggregation session is stopped by the peer
53 * or something calling ieee80211_stop_tx_ba_session(), the driver's
54 * @ampdu_action function will be called with the action
55 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
56 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
57 * Note that the sta can get destroyed before the BA tear down is
61 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
62 const u8 *da, u16 tid,
63 u8 dialog_token, u16 start_seq_num,
64 u16 agg_size, u16 timeout)
66 struct ieee80211_local *local = sdata->local;
68 struct ieee80211_mgmt *mgmt;
71 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
76 skb_reserve(skb, local->hw.extra_tx_headroom);
77 mgmt = skb_put_zero(skb, 24);
78 memcpy(mgmt->da, da, ETH_ALEN);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 if (sdata->vif.type == NL80211_IFTYPE_AP ||
81 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
82 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
83 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
84 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
85 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
86 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
87 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
89 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
90 IEEE80211_STYPE_ACTION);
92 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
94 mgmt->u.action.category = WLAN_CATEGORY_BACK;
95 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
97 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
98 capab = (u16)(1 << 0); /* bit 0 A-MSDU support */
99 capab |= (u16)(1 << 1); /* bit 1 aggregation policy */
100 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
101 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
103 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
105 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
106 mgmt->u.action.u.addba_req.start_seq_num =
107 cpu_to_le16(start_seq_num << 4);
109 ieee80211_tx_skb(sdata, skb);
112 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
114 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
115 struct ieee80211_local *local = sdata->local;
117 struct ieee80211_bar *bar;
120 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
124 skb_reserve(skb, local->hw.extra_tx_headroom);
125 bar = skb_put_zero(skb, sizeof(*bar));
126 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
127 IEEE80211_STYPE_BACK_REQ);
128 memcpy(bar->ra, ra, ETH_ALEN);
129 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
130 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
131 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
132 bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
133 bar->control = cpu_to_le16(bar_control);
134 bar->start_seq_num = cpu_to_le16(ssn);
136 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
137 IEEE80211_TX_CTL_REQ_TX_STATUS;
138 ieee80211_tx_skb_tid(sdata, skb, tid);
140 EXPORT_SYMBOL(ieee80211_send_bar);
142 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
143 struct tid_ampdu_tx *tid_tx)
145 lockdep_assert_held(&sta->ampdu_mlme.mtx);
146 lockdep_assert_held(&sta->lock);
147 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
151 * When multiple aggregation sessions on multiple stations
152 * are being created/destroyed simultaneously, we need to
153 * refcount the global queue stop caused by that in order
154 * to not get into a situation where one of the aggregation
155 * setup or teardown re-enables queues before the other is
156 * ready to handle that.
158 * These two functions take care of this issue by keeping
159 * a global "agg_queue_stop" refcount.
161 static void __acquires(agg_queue)
162 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
164 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
166 /* we do refcounting here, so don't use the queue reason refcounting */
168 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
169 ieee80211_stop_queue_by_reason(
170 &sdata->local->hw, queue,
171 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
173 __acquire(agg_queue);
176 static void __releases(agg_queue)
177 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
179 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
181 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
182 ieee80211_wake_queue_by_reason(
183 &sdata->local->hw, queue,
184 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
186 __release(agg_queue);
190 ieee80211_agg_stop_txq(struct sta_info *sta, int tid)
192 struct ieee80211_txq *txq = sta->sta.txq[tid];
193 struct ieee80211_sub_if_data *sdata;
195 struct txq_info *txqi;
200 txqi = to_txq_info(txq);
201 sdata = vif_to_sdata(txq->vif);
202 fq = &sdata->local->fq;
204 /* Lock here to protect against further seqno updates on dequeue */
205 spin_lock_bh(&fq->lock);
206 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
207 spin_unlock_bh(&fq->lock);
211 ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable)
213 struct ieee80211_txq *txq = sta->sta.txq[tid];
214 struct txq_info *txqi;
219 txqi = to_txq_info(txq);
222 set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
224 clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
226 clear_bit(IEEE80211_TXQ_STOP, &txqi->flags);
229 schedule_and_wake_txq(sta->sdata->local, txqi);
235 * splice packets from the STA's pending to the local pending,
236 * requires a call to ieee80211_agg_splice_finish later
238 static void __acquires(agg_queue)
239 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
240 struct tid_ampdu_tx *tid_tx, u16 tid)
242 struct ieee80211_local *local = sdata->local;
243 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
246 ieee80211_stop_queue_agg(sdata, tid);
249 "TID %d gone but expected when splicing aggregates from the pending queue\n",
253 if (!skb_queue_empty(&tid_tx->pending)) {
254 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
255 /* copy over remaining packets */
256 skb_queue_splice_tail_init(&tid_tx->pending,
257 &local->pending[queue]);
258 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
262 static void __releases(agg_queue)
263 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
265 ieee80211_wake_queue_agg(sdata, tid);
268 static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
270 struct tid_ampdu_tx *tid_tx;
272 lockdep_assert_held(&sta->ampdu_mlme.mtx);
273 lockdep_assert_held(&sta->lock);
275 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
278 * When we get here, the TX path will not be lockless any more wrt.
279 * aggregation, since the OPERATIONAL bit has long been cleared.
280 * Thus it will block on getting the lock, if it occurs. So if we
281 * stop the queue now, we will not get any more packets, and any
282 * that might be being processed will wait for us here, thereby
283 * guaranteeing that no packets go to the tid_tx pending queue any
287 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
289 /* future packets must not find the tid_tx struct any more */
290 ieee80211_assign_tid_tx(sta, tid, NULL);
292 ieee80211_agg_splice_finish(sta->sdata, tid);
293 ieee80211_agg_start_txq(sta, tid, false);
295 kfree_rcu(tid_tx, rcu_head);
298 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
299 enum ieee80211_agg_stop_reason reason)
301 struct ieee80211_local *local = sta->local;
302 struct tid_ampdu_tx *tid_tx;
303 struct ieee80211_ampdu_params params = {
313 lockdep_assert_held(&sta->ampdu_mlme.mtx);
316 case AGG_STOP_DECLINED:
317 case AGG_STOP_LOCAL_REQUEST:
318 case AGG_STOP_PEER_REQUEST:
319 params.action = IEEE80211_AMPDU_TX_STOP_CONT;
321 case AGG_STOP_DESTROY_STA:
322 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
329 spin_lock_bh(&sta->lock);
331 /* free struct pending for start, if present */
332 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
334 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
336 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
338 spin_unlock_bh(&sta->lock);
343 * if we're already stopping ignore any new requests to stop
344 * unless we're destroying it in which case notify the driver
346 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
347 spin_unlock_bh(&sta->lock);
348 if (reason != AGG_STOP_DESTROY_STA)
350 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
351 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
356 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
357 /* not even started yet! */
358 ieee80211_assign_tid_tx(sta, tid, NULL);
359 spin_unlock_bh(&sta->lock);
360 kfree_rcu(tid_tx, rcu_head);
364 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
366 ieee80211_agg_stop_txq(sta, tid);
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.
395 if (!local->in_reconfig)
398 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
399 WLAN_BACK_RECIPIENT :
401 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
403 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
405 /* HW shall not deny going back to legacy */
408 * We may have pending packets get stuck in this case...
409 * Not bothering with a workaround for now.
414 * In the case of AGG_STOP_DESTROY_STA, the driver won't
415 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
416 * seem like we can leave the tid_tx data pending forever.
417 * This is true, in a way, but "forever" is only until the
418 * station struct is actually destroyed. In the meantime,
419 * leaving it around ensures that we don't transmit packets
420 * to the driver on this TID which might confuse it.
427 * After sending add Block Ack request we activated a timer until
428 * add Block Ack response will arrive from the recipient.
429 * If this timer expires sta_addba_resp_timer_expired will be executed.
431 static void sta_addba_resp_timer_expired(struct timer_list *t)
433 struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer);
434 struct sta_info *sta = tid_tx->sta;
435 u8 tid = tid_tx->tid;
437 /* check if the TID waits for addBA response */
438 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
440 "timer expired on %pM tid %d not expecting addBA response\n",
445 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
448 ieee80211_stop_tx_ba_session(&sta->sta, tid);
451 static void ieee80211_send_addba_with_timeout(struct sta_info *sta,
452 struct tid_ampdu_tx *tid_tx)
454 struct ieee80211_sub_if_data *sdata = sta->sdata;
455 struct ieee80211_local *local = sta->local;
456 u8 tid = tid_tx->tid;
459 /* activate the timer for the recipient's addBA response */
460 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
461 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
464 spin_lock_bh(&sta->lock);
465 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
466 sta->ampdu_mlme.addba_req_num[tid]++;
467 spin_unlock_bh(&sta->lock);
469 if (sta->sta.he_cap.has_he) {
470 buf_size = local->hw.max_tx_aggregation_subframes;
473 * We really should use what the driver told us it will
474 * transmit as the maximum, but certain APs (e.g. the
475 * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012)
476 * will crash when we use a lower number.
478 buf_size = IEEE80211_MAX_AMPDU_BUF_HT;
481 /* send AddBA request */
482 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
483 tid_tx->dialog_token,
484 sta->tid_seq[tid] >> 4,
485 buf_size, tid_tx->timeout);
487 WARN_ON(test_and_set_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state));
490 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
492 struct tid_ampdu_tx *tid_tx;
493 struct ieee80211_local *local = sta->local;
494 struct ieee80211_sub_if_data *sdata = sta->sdata;
495 struct ieee80211_ampdu_params params = {
497 .action = IEEE80211_AMPDU_TX_START,
505 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
508 * Start queuing up packets for this aggregation session.
509 * We're going to release them once the driver is OK with
512 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
514 ieee80211_agg_stop_txq(sta, tid);
517 * Make sure no packets are being processed. This ensures that
518 * we have a valid starting sequence number and that in-flight
519 * packets have been flushed out and no packets for this TID
520 * will go into the driver during the ampdu_action call.
524 params.ssn = sta->tid_seq[tid] >> 4;
525 ret = drv_ampdu_action(local, sdata, ¶ms);
526 if (ret == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) {
528 } else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) {
530 * We didn't send the request yet, so don't need to check
531 * here if we already got a response, just mark as driver
534 set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state);
537 "BA request denied - HW unavailable for %pM tid %d\n",
539 spin_lock_bh(&sta->lock);
540 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
541 ieee80211_assign_tid_tx(sta, tid, NULL);
542 ieee80211_agg_splice_finish(sdata, tid);
543 spin_unlock_bh(&sta->lock);
545 ieee80211_agg_start_txq(sta, tid, false);
547 kfree_rcu(tid_tx, rcu_head);
551 ieee80211_send_addba_with_timeout(sta, tid_tx);
555 * After accepting the AddBA Response we activated a timer,
556 * resetting it after each frame that we send.
558 static void sta_tx_agg_session_timer_expired(struct timer_list *t)
560 struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer);
561 struct sta_info *sta = tid_tx->sta;
562 u8 tid = tid_tx->tid;
563 unsigned long timeout;
565 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
569 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
570 if (time_is_after_jiffies(timeout)) {
571 mod_timer(&tid_tx->session_timer, timeout);
575 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
578 ieee80211_stop_tx_ba_session(&sta->sta, tid);
581 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
584 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
585 struct ieee80211_sub_if_data *sdata = sta->sdata;
586 struct ieee80211_local *local = sdata->local;
587 struct tid_ampdu_tx *tid_tx;
590 trace_api_start_tx_ba_session(pubsta, tid);
592 if (WARN(sta->reserved_tid == tid,
593 "Requested to start BA session on reserved tid=%d", tid))
596 if (!pubsta->ht_cap.ht_supported &&
597 sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ)
600 if (WARN_ON_ONCE(!local->ops->ampdu_action))
603 if ((tid >= IEEE80211_NUM_TIDS) ||
604 !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
605 ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
608 if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
611 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
614 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
615 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
616 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
617 sdata->vif.type != NL80211_IFTYPE_AP &&
618 sdata->vif.type != NL80211_IFTYPE_ADHOC)
621 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
623 "BA sessions blocked - Denying BA session request %pM tid %d\n",
629 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
630 * member of an IBSS, and has no other existing Block Ack agreement
631 * with the recipient STA, then the initiating STA shall transmit a
632 * Probe Request frame to the recipient STA and shall not transmit an
633 * ADDBA Request frame unless it receives a Probe Response frame
634 * from the recipient within dot11ADDBAFailureTimeout.
636 * The probe request mechanism for ADDBA is currently not implemented,
637 * but we only build up Block Ack session with HT STAs. This information
638 * is set when we receive a bss info from a probe response or a beacon.
640 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
641 !sta->sta.ht_cap.ht_supported) {
643 "BA request denied - IBSS STA %pM does not advertise HT support\n",
648 spin_lock_bh(&sta->lock);
650 /* we have tried too many times, receiver does not want A-MPDU */
651 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
657 * if we have tried more than HT_AGG_BURST_RETRIES times we
658 * will spread our requests in time to avoid stalling connection
661 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
662 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
663 HT_AGG_RETRIES_PERIOD)) {
665 "BA request denied - %d failed requests on %pM tid %u\n",
666 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
671 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
672 /* check if the TID is not in aggregation flow already */
673 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
675 "BA request denied - session is not idle on %pM tid %u\n",
681 /* prepare A-MPDU MLME for Tx aggregation */
682 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
688 skb_queue_head_init(&tid_tx->pending);
689 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
691 tid_tx->timeout = timeout;
696 timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
699 timer_setup(&tid_tx->session_timer,
700 sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
702 /* assign a dialog token */
703 sta->ampdu_mlme.dialog_token_allocator++;
704 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
707 * Finally, assign it to the start array; the work item will
708 * collect it and move it to the normal array.
710 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
712 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
714 /* this flow continues off the work */
716 spin_unlock_bh(&sta->lock);
719 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
721 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
722 struct sta_info *sta, u16 tid)
724 struct tid_ampdu_tx *tid_tx;
725 struct ieee80211_ampdu_params params = {
727 .action = IEEE80211_AMPDU_TX_OPERATIONAL,
733 lockdep_assert_held(&sta->ampdu_mlme.mtx);
735 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
736 params.buf_size = tid_tx->buf_size;
737 params.amsdu = tid_tx->amsdu;
739 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
742 drv_ampdu_action(local, sta->sdata, ¶ms);
745 * synchronize with TX path, while splicing the TX path
746 * should block so it won't put more packets onto pending.
748 spin_lock_bh(&sta->lock);
750 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
752 * Now mark as operational. This will be visible
753 * in the TX path, and lets it go lock-free in
756 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
757 ieee80211_agg_splice_finish(sta->sdata, tid);
759 spin_unlock_bh(&sta->lock);
761 ieee80211_agg_start_txq(sta, tid, true);
764 void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid,
765 struct tid_ampdu_tx *tid_tx)
767 struct ieee80211_sub_if_data *sdata = sta->sdata;
768 struct ieee80211_local *local = sdata->local;
770 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
773 if (!test_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)) {
774 ieee80211_send_addba_with_timeout(sta, tid_tx);
775 /* RESPONSE_RECEIVED state whould trigger the flow again */
779 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
780 ieee80211_agg_tx_operational(local, sta, tid);
783 static struct tid_ampdu_tx *
784 ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata,
785 const u8 *ra, u16 tid, struct sta_info **sta)
787 struct tid_ampdu_tx *tid_tx;
789 if (tid >= IEEE80211_NUM_TIDS) {
790 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
791 tid, IEEE80211_NUM_TIDS);
795 *sta = sta_info_get_bss(sdata, ra);
797 ht_dbg(sdata, "Could not find station: %pM\n", ra);
801 tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]);
803 if (WARN_ON(!tid_tx))
804 ht_dbg(sdata, "addBA was not requested!\n");
809 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
810 const u8 *ra, u16 tid)
812 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
813 struct ieee80211_local *local = sdata->local;
814 struct sta_info *sta;
815 struct tid_ampdu_tx *tid_tx;
817 trace_api_start_tx_ba_cb(sdata, ra, tid);
820 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
824 set_bit(HT_AGG_STATE_START_CB, &tid_tx->state);
825 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
829 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
831 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
832 enum ieee80211_agg_stop_reason reason)
836 mutex_lock(&sta->ampdu_mlme.mtx);
838 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
840 mutex_unlock(&sta->ampdu_mlme.mtx);
845 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
847 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
848 struct ieee80211_sub_if_data *sdata = sta->sdata;
849 struct ieee80211_local *local = sdata->local;
850 struct tid_ampdu_tx *tid_tx;
853 trace_api_stop_tx_ba_session(pubsta, tid);
855 if (!local->ops->ampdu_action)
858 if (tid >= IEEE80211_NUM_TIDS)
861 spin_lock_bh(&sta->lock);
862 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
869 WARN(sta->reserved_tid == tid,
870 "Requested to stop BA session on reserved tid=%d", tid);
872 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
873 /* already in progress stopping it */
878 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
879 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
882 spin_unlock_bh(&sta->lock);
885 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
887 void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid,
888 struct tid_ampdu_tx *tid_tx)
890 struct ieee80211_sub_if_data *sdata = sta->sdata;
891 bool send_delba = false;
893 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n",
896 spin_lock_bh(&sta->lock);
898 if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
900 "unexpected callback to A-MPDU stop for %pM tid %d\n",
905 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
908 ieee80211_remove_tid_tx(sta, tid);
911 spin_unlock_bh(&sta->lock);
914 ieee80211_send_delba(sdata, sta->sta.addr, tid,
915 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
918 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
919 const u8 *ra, u16 tid)
921 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
922 struct ieee80211_local *local = sdata->local;
923 struct sta_info *sta;
924 struct tid_ampdu_tx *tid_tx;
926 trace_api_stop_tx_ba_cb(sdata, ra, tid);
929 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
933 set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state);
934 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
938 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
941 void ieee80211_process_addba_resp(struct ieee80211_local *local,
942 struct sta_info *sta,
943 struct ieee80211_mgmt *mgmt,
946 struct tid_ampdu_tx *tid_tx;
947 struct ieee80211_txq *txq;
948 u16 capab, tid, buf_size;
951 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
952 amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
953 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
954 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
955 buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
957 txq = sta->sta.txq[tid];
959 set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
961 mutex_lock(&sta->ampdu_mlme.mtx);
963 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
967 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
968 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
973 del_timer_sync(&tid_tx->addba_resp_timer);
975 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
979 * addba_resp_timer may have fired before we got here, and
980 * caused WANT_STOP to be set. If the stop then was already
981 * processed further, STOPPING might be set.
983 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
984 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
986 "got addBA resp for %pM tid %d but we already gave up\n",
992 * IEEE 802.11-2007 7.3.1.14:
993 * In an ADDBA Response frame, when the Status Code field
994 * is set to 0, the Buffer Size subfield is set to a value
997 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
998 == WLAN_STATUS_SUCCESS && buf_size) {
999 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
1001 /* ignore duplicate response */
1005 tid_tx->buf_size = buf_size;
1006 tid_tx->amsdu = amsdu;
1008 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
1009 ieee80211_agg_tx_operational(local, sta, tid);
1011 sta->ampdu_mlme.addba_req_num[tid] = 0;
1014 le16_to_cpu(mgmt->u.action.u.addba_resp.timeout);
1016 if (tid_tx->timeout) {
1017 mod_timer(&tid_tx->session_timer,
1018 TU_TO_EXP_TIME(tid_tx->timeout));
1019 tid_tx->last_tx = jiffies;
1023 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
1027 mutex_unlock(&sta->ampdu_mlme.mtx);