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 - 2021 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 = IEEE80211_ADDBA_PARAM_AMSDU_MASK;
99 capab |= IEEE80211_ADDBA_PARAM_POLICY_MASK;
100 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK);
101 capab |= u16_encode_bits(agg_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);
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_tid(sdata, skb, tid);
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;
216 lockdep_assert_held(&sta->ampdu_mlme.mtx);
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 schedule_and_wake_txq(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);
296 kfree_rcu(tid_tx, rcu_head);
299 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
300 enum ieee80211_agg_stop_reason reason)
302 struct ieee80211_local *local = sta->local;
303 struct tid_ampdu_tx *tid_tx;
304 struct ieee80211_ampdu_params params = {
314 lockdep_assert_held(&sta->ampdu_mlme.mtx);
317 case AGG_STOP_DECLINED:
318 case AGG_STOP_LOCAL_REQUEST:
319 case AGG_STOP_PEER_REQUEST:
320 params.action = IEEE80211_AMPDU_TX_STOP_CONT;
322 case AGG_STOP_DESTROY_STA:
323 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
330 spin_lock_bh(&sta->lock);
332 /* free struct pending for start, if present */
333 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
335 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
337 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
339 spin_unlock_bh(&sta->lock);
344 * if we're already stopping ignore any new requests to stop
345 * unless we're destroying it in which case notify the driver
347 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
348 spin_unlock_bh(&sta->lock);
349 if (reason != AGG_STOP_DESTROY_STA)
351 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
352 ret = drv_ampdu_action(local, sta->sdata, ¶ms);
357 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
358 /* not even started yet! */
359 ieee80211_assign_tid_tx(sta, tid, NULL);
360 spin_unlock_bh(&sta->lock);
361 kfree_rcu(tid_tx, rcu_head);
365 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
367 ieee80211_agg_stop_txq(sta, tid);
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 static void ieee80211_send_addba_with_timeout(struct sta_info *sta,
453 struct tid_ampdu_tx *tid_tx)
455 struct ieee80211_sub_if_data *sdata = sta->sdata;
456 struct ieee80211_local *local = sta->local;
457 u8 tid = tid_tx->tid;
460 /* activate the timer for the recipient's addBA response */
461 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
462 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
465 spin_lock_bh(&sta->lock);
466 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
467 sta->ampdu_mlme.addba_req_num[tid]++;
468 spin_unlock_bh(&sta->lock);
470 if (sta->sta.he_cap.has_he) {
471 buf_size = local->hw.max_tx_aggregation_subframes;
474 * We really should use what the driver told us it will
475 * transmit as the maximum, but certain APs (e.g. the
476 * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012)
477 * will crash when we use a lower number.
479 buf_size = IEEE80211_MAX_AMPDU_BUF_HT;
482 /* send AddBA request */
483 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
484 tid_tx->dialog_token, tid_tx->ssn,
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 tid_tx->ssn = params.ssn;
527 if (ret == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) {
529 } else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) {
531 * We didn't send the request yet, so don't need to check
532 * here if we already got a response, just mark as driver
535 set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state);
538 "BA request denied - HW unavailable for %pM tid %d\n",
540 spin_lock_bh(&sta->lock);
541 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
542 ieee80211_assign_tid_tx(sta, tid, NULL);
543 ieee80211_agg_splice_finish(sdata, tid);
544 spin_unlock_bh(&sta->lock);
546 ieee80211_agg_start_txq(sta, tid, false);
548 kfree_rcu(tid_tx, rcu_head);
552 ieee80211_send_addba_with_timeout(sta, tid_tx);
556 * After accepting the AddBA Response we activated a timer,
557 * resetting it after each frame that we send.
559 static void sta_tx_agg_session_timer_expired(struct timer_list *t)
561 struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer);
562 struct sta_info *sta = tid_tx->sta;
563 u8 tid = tid_tx->tid;
564 unsigned long timeout;
566 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
570 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
571 if (time_is_after_jiffies(timeout)) {
572 mod_timer(&tid_tx->session_timer, timeout);
576 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
579 ieee80211_stop_tx_ba_session(&sta->sta, tid);
582 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
585 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
586 struct ieee80211_sub_if_data *sdata = sta->sdata;
587 struct ieee80211_local *local = sdata->local;
588 struct tid_ampdu_tx *tid_tx;
591 trace_api_start_tx_ba_session(pubsta, tid);
593 if (WARN(sta->reserved_tid == tid,
594 "Requested to start BA session on reserved tid=%d", tid))
597 if (!pubsta->ht_cap.ht_supported &&
598 sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ)
601 if (WARN_ON_ONCE(!local->ops->ampdu_action))
604 if ((tid >= IEEE80211_NUM_TIDS) ||
605 !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
606 ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
609 if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
612 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
615 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
616 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
617 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
618 sdata->vif.type != NL80211_IFTYPE_AP &&
619 sdata->vif.type != NL80211_IFTYPE_ADHOC)
622 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
624 "BA sessions blocked - Denying BA session request %pM tid %d\n",
630 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
631 * member of an IBSS, and has no other existing Block Ack agreement
632 * with the recipient STA, then the initiating STA shall transmit a
633 * Probe Request frame to the recipient STA and shall not transmit an
634 * ADDBA Request frame unless it receives a Probe Response frame
635 * from the recipient within dot11ADDBAFailureTimeout.
637 * The probe request mechanism for ADDBA is currently not implemented,
638 * but we only build up Block Ack session with HT STAs. This information
639 * is set when we receive a bss info from a probe response or a beacon.
641 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
642 !sta->sta.ht_cap.ht_supported) {
644 "BA request denied - IBSS STA %pM does not advertise HT support\n",
649 spin_lock_bh(&sta->lock);
651 /* we have tried too many times, receiver does not want A-MPDU */
652 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
658 * if we have tried more than HT_AGG_BURST_RETRIES times we
659 * will spread our requests in time to avoid stalling connection
662 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
663 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
664 HT_AGG_RETRIES_PERIOD)) {
666 "BA request denied - %d failed requests on %pM tid %u\n",
667 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
672 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
673 /* check if the TID is not in aggregation flow already */
674 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
676 "BA request denied - session is not idle on %pM tid %u\n",
682 /* prepare A-MPDU MLME for Tx aggregation */
683 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
689 skb_queue_head_init(&tid_tx->pending);
690 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
692 tid_tx->timeout = timeout;
697 timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
700 timer_setup(&tid_tx->session_timer,
701 sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
703 /* assign a dialog token */
704 sta->ampdu_mlme.dialog_token_allocator++;
705 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
708 * Finally, assign it to the start array; the work item will
709 * collect it and move it to the normal array.
711 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
713 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
715 /* this flow continues off the work */
717 spin_unlock_bh(&sta->lock);
720 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
722 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
723 struct sta_info *sta, u16 tid)
725 struct tid_ampdu_tx *tid_tx;
726 struct ieee80211_ampdu_params params = {
728 .action = IEEE80211_AMPDU_TX_OPERATIONAL,
734 lockdep_assert_held(&sta->ampdu_mlme.mtx);
736 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
737 params.buf_size = tid_tx->buf_size;
738 params.amsdu = tid_tx->amsdu;
740 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
743 drv_ampdu_action(local, sta->sdata, ¶ms);
746 * synchronize with TX path, while splicing the TX path
747 * should block so it won't put more packets onto pending.
749 spin_lock_bh(&sta->lock);
751 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
753 * Now mark as operational. This will be visible
754 * in the TX path, and lets it go lock-free in
757 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
758 ieee80211_agg_splice_finish(sta->sdata, tid);
760 spin_unlock_bh(&sta->lock);
762 ieee80211_agg_start_txq(sta, tid, true);
765 void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid,
766 struct tid_ampdu_tx *tid_tx)
768 struct ieee80211_sub_if_data *sdata = sta->sdata;
769 struct ieee80211_local *local = sdata->local;
771 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
774 if (!test_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)) {
775 ieee80211_send_addba_with_timeout(sta, tid_tx);
776 /* RESPONSE_RECEIVED state whould trigger the flow again */
780 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
781 ieee80211_agg_tx_operational(local, sta, tid);
784 static struct tid_ampdu_tx *
785 ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata,
786 const u8 *ra, u16 tid, struct sta_info **sta)
788 struct tid_ampdu_tx *tid_tx;
790 if (tid >= IEEE80211_NUM_TIDS) {
791 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
792 tid, IEEE80211_NUM_TIDS);
796 *sta = sta_info_get_bss(sdata, ra);
798 ht_dbg(sdata, "Could not find station: %pM\n", ra);
802 tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]);
804 if (WARN_ON(!tid_tx))
805 ht_dbg(sdata, "addBA was not requested!\n");
810 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
811 const u8 *ra, u16 tid)
813 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
814 struct ieee80211_local *local = sdata->local;
815 struct sta_info *sta;
816 struct tid_ampdu_tx *tid_tx;
818 trace_api_start_tx_ba_cb(sdata, ra, tid);
821 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
825 set_bit(HT_AGG_STATE_START_CB, &tid_tx->state);
826 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
830 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
832 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
833 enum ieee80211_agg_stop_reason reason)
837 mutex_lock(&sta->ampdu_mlme.mtx);
839 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
841 mutex_unlock(&sta->ampdu_mlme.mtx);
846 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
848 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
849 struct ieee80211_sub_if_data *sdata = sta->sdata;
850 struct ieee80211_local *local = sdata->local;
851 struct tid_ampdu_tx *tid_tx;
854 trace_api_stop_tx_ba_session(pubsta, tid);
856 if (!local->ops->ampdu_action)
859 if (tid >= IEEE80211_NUM_TIDS)
862 spin_lock_bh(&sta->lock);
863 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
870 WARN(sta->reserved_tid == tid,
871 "Requested to stop BA session on reserved tid=%d", tid);
873 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
874 /* already in progress stopping it */
879 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
880 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
883 spin_unlock_bh(&sta->lock);
886 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
888 void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid,
889 struct tid_ampdu_tx *tid_tx)
891 struct ieee80211_sub_if_data *sdata = sta->sdata;
892 bool send_delba = false;
893 bool start_txq = false;
895 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n",
898 spin_lock_bh(&sta->lock);
900 if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
902 "unexpected callback to A-MPDU stop for %pM tid %d\n",
907 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
910 ieee80211_remove_tid_tx(sta, tid);
914 spin_unlock_bh(&sta->lock);
917 ieee80211_agg_start_txq(sta, tid, false);
920 ieee80211_send_delba(sdata, sta->sta.addr, tid,
921 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
924 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
925 const u8 *ra, u16 tid)
927 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
928 struct ieee80211_local *local = sdata->local;
929 struct sta_info *sta;
930 struct tid_ampdu_tx *tid_tx;
932 trace_api_stop_tx_ba_cb(sdata, ra, tid);
935 tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
939 set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state);
940 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
944 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
947 void ieee80211_process_addba_resp(struct ieee80211_local *local,
948 struct sta_info *sta,
949 struct ieee80211_mgmt *mgmt,
952 struct tid_ampdu_tx *tid_tx;
953 struct ieee80211_txq *txq;
954 u16 capab, tid, buf_size;
957 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
958 amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
959 tid = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_TID_MASK);
960 buf_size = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);
961 buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
963 txq = sta->sta.txq[tid];
965 set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
967 mutex_lock(&sta->ampdu_mlme.mtx);
969 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
973 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
974 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
979 del_timer_sync(&tid_tx->addba_resp_timer);
981 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
985 * addba_resp_timer may have fired before we got here, and
986 * caused WANT_STOP to be set. If the stop then was already
987 * processed further, STOPPING might be set.
989 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
990 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
992 "got addBA resp for %pM tid %d but we already gave up\n",
998 * IEEE 802.11-2007 7.3.1.14:
999 * In an ADDBA Response frame, when the Status Code field
1000 * is set to 0, the Buffer Size subfield is set to a value
1003 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1004 == WLAN_STATUS_SUCCESS && buf_size) {
1005 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
1007 /* ignore duplicate response */
1011 tid_tx->buf_size = buf_size;
1012 tid_tx->amsdu = amsdu;
1014 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
1015 ieee80211_agg_tx_operational(local, sta, tid);
1017 sta->ampdu_mlme.addba_req_num[tid] = 0;
1020 le16_to_cpu(mgmt->u.action.u.addba_resp.timeout);
1022 if (tid_tx->timeout) {
1023 mod_timer(&tid_tx->session_timer,
1024 TU_TO_EXP_TIME(tid_tx->timeout));
1025 tid_tx->last_tx = jiffies;
1029 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
1033 mutex_unlock(&sta->ampdu_mlme.mtx);