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Johannes Bergb8695a82009-02-10 21:25:46 +01001/*
2 * HT handling
3 *
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>
Johannes Bergcfcdbde2010-06-10 10:21:48 +02009 * Copyright 2007-2010, Intel Corporation
Sara Sharon50ea05e2015-12-30 16:06:04 +020010 * Copyright(c) 2015 Intel Deutschland GmbH
Johannes Bergb8695a82009-02-10 21:25:46 +010011 *
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.
15 */
16
17#include <linux/ieee80211.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040019#include <linux/export.h>
Johannes Bergb8695a82009-02-10 21:25:46 +010020#include <net/mac80211.h>
21#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020022#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010023#include "wme.h"
24
Johannes Berg86ab6c52009-02-10 21:25:49 +010025/**
Johannes Berg73a72a82010-06-10 10:21:50 +020026 * DOC: TX A-MPDU aggregation
Johannes Berg86ab6c52009-02-10 21:25:49 +010027 *
28 * Aggregation on the TX side requires setting the hardware flag
Johannes Berg73a72a82010-06-10 10:21:50 +020029 * %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.
Johannes Berg86ab6c52009-02-10 21:25:49 +010033 *
Johannes Berg73a72a82010-06-10 10:21:50 +020034 * 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.
Johannes Berg86ab6c52009-02-10 21:25:49 +010039 *
40 * In response to that, the driver is later required to call the
Johannes Berg73a72a82010-06-10 10:21:50 +020041 * 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
47 * setup completion.
Johannes Berg86ab6c52009-02-10 21:25:49 +010048 *
Johannes Berg73a72a82010-06-10 10:21:50 +020049 * 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.
53 *
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().
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +053059 * Note that the sta can get destroyed before the BA tear down is
60 * complete.
Johannes Berg86ab6c52009-02-10 21:25:49 +010061 */
62
Johannes Bergb8695a82009-02-10 21:25:46 +010063static 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)
67{
68 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +010069 struct sk_buff *skb;
70 struct ieee80211_mgmt *mgmt;
71 u16 capab;
72
73 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
74
Joe Perchesd15b8452011-08-29 14:17:31 -070075 if (!skb)
Johannes Bergb8695a82009-02-10 21:25:46 +010076 return;
Joe Perchesd15b8452011-08-29 14:17:31 -070077
Johannes Bergb8695a82009-02-10 21:25:46 +010078 skb_reserve(skb, local->hw.extra_tx_headroom);
79 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
80 memset(mgmt, 0, 24);
81 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +010082 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +010083 if (sdata->vif.type == NL80211_IFTYPE_AP ||
Thomas Pedersenae2772b2011-10-26 14:47:29 -070084 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
85 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Johannes Berg47846c92009-11-25 17:46:19 +010086 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010087 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
88 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Alexander Simon13c40c52011-11-30 16:56:34 +010089 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
90 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +010091
92 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
93 IEEE80211_STYPE_ACTION);
94
95 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
96
97 mgmt->u.action.category = WLAN_CATEGORY_BACK;
98 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
99
100 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
Emmanuel Grumbache3abc8f2015-08-16 11:13:22 +0300101 capab = (u16)(1 << 0); /* bit 0 A-MSDU support */
102 capab |= (u16)(1 << 1); /* bit 1 aggregation policy */
Johannes Bergb8695a82009-02-10 21:25:46 +0100103 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
104 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
105
106 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
107
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);
111
Karl Beldanc6e13322014-01-23 20:06:34 +0100112 ieee80211_tx_skb(sdata, skb);
Johannes Bergb8695a82009-02-10 21:25:46 +0100113}
114
Felix Fietkau8c771242011-08-20 15:53:55 +0200115void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
Johannes Bergb8695a82009-02-10 21:25:46 +0100116{
Felix Fietkau8c771242011-08-20 15:53:55 +0200117 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
Johannes Bergb8695a82009-02-10 21:25:46 +0100118 struct ieee80211_local *local = sdata->local;
119 struct sk_buff *skb;
120 struct ieee80211_bar *bar;
121 u16 bar_control = 0;
122
123 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
Joe Perchesd15b8452011-08-29 14:17:31 -0700124 if (!skb)
Johannes Bergb8695a82009-02-10 21:25:46 +0100125 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700126
Johannes Bergb8695a82009-02-10 21:25:46 +0100127 skb_reserve(skb, local->hw.extra_tx_headroom);
128 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
129 memset(bar, 0, sizeof(*bar));
130 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
131 IEEE80211_STYPE_BACK_REQ);
132 memcpy(bar->ra, ra, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100133 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +0100134 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
135 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
Helmut Schaac1407b62011-08-11 16:17:41 +0200136 bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
Johannes Bergb8695a82009-02-10 21:25:46 +0100137 bar->control = cpu_to_le16(bar_control);
138 bar->start_seq_num = cpu_to_le16(ssn);
139
Christian Lamparter2f7916f2012-07-07 15:13:08 +0200140 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
141 IEEE80211_TX_CTL_REQ_TX_STATUS;
Helmut Schaacf6bb792011-12-15 10:18:34 +0100142 ieee80211_tx_skb_tid(sdata, skb, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100143}
Felix Fietkau8c771242011-08-20 15:53:55 +0200144EXPORT_SYMBOL(ieee80211_send_bar);
Johannes Bergb8695a82009-02-10 21:25:46 +0100145
Johannes Bergec034b22011-05-13 13:35:40 +0200146void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
147 struct tid_ampdu_tx *tid_tx)
148{
149 lockdep_assert_held(&sta->ampdu_mlme.mtx);
150 lockdep_assert_held(&sta->lock);
151 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
152}
153
Johannes Berg30bf5f12012-12-28 09:43:03 +0100154/*
155 * When multiple aggregation sessions on multiple stations
156 * are being created/destroyed simultaneously, we need to
157 * refcount the global queue stop caused by that in order
158 * to not get into a situation where one of the aggregation
159 * setup or teardown re-enables queues before the other is
160 * ready to handle that.
161 *
162 * These two functions take care of this issue by keeping
163 * a global "agg_queue_stop" refcount.
164 */
165static void __acquires(agg_queue)
166ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
167{
168 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
169
Luciano Coelhocca07b02014-06-13 16:30:05 +0300170 /* we do refcounting here, so don't use the queue reason refcounting */
171
Johannes Berg30bf5f12012-12-28 09:43:03 +0100172 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
173 ieee80211_stop_queue_by_reason(
174 &sdata->local->hw, queue,
Luciano Coelhocca07b02014-06-13 16:30:05 +0300175 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
176 false);
Johannes Berg30bf5f12012-12-28 09:43:03 +0100177 __acquire(agg_queue);
178}
179
180static void __releases(agg_queue)
181ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
182{
183 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
184
185 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
186 ieee80211_wake_queue_by_reason(
187 &sdata->local->hw, queue,
Luciano Coelhocca07b02014-06-13 16:30:05 +0300188 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
189 false);
Johannes Berg30bf5f12012-12-28 09:43:03 +0100190 __release(agg_queue);
191}
192
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100193static void
194ieee80211_agg_stop_txq(struct sta_info *sta, int tid)
195{
196 struct ieee80211_txq *txq = sta->sta.txq[tid];
Michal Kaziorfa962b92016-05-19 10:37:49 +0200197 struct ieee80211_sub_if_data *sdata;
198 struct fq *fq;
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100199 struct txq_info *txqi;
200
201 if (!txq)
202 return;
203
204 txqi = to_txq_info(txq);
Michal Kaziorfa962b92016-05-19 10:37:49 +0200205 sdata = vif_to_sdata(txq->vif);
206 fq = &sdata->local->fq;
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100207
208 /* Lock here to protect against further seqno updates on dequeue */
Michal Kaziorfa962b92016-05-19 10:37:49 +0200209 spin_lock_bh(&fq->lock);
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100210 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
Michal Kaziorfa962b92016-05-19 10:37:49 +0200211 spin_unlock_bh(&fq->lock);
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100212}
213
214static void
215ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable)
216{
217 struct ieee80211_txq *txq = sta->sta.txq[tid];
218 struct txq_info *txqi;
219
220 if (!txq)
221 return;
222
223 txqi = to_txq_info(txq);
224
225 if (enable)
226 set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
227 else
228 clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
229
230 clear_bit(IEEE80211_TXQ_STOP, &txqi->flags);
231 drv_wake_tx_queue(sta->sdata->local, txqi);
232}
233
Johannes Berg30bf5f12012-12-28 09:43:03 +0100234/*
235 * splice packets from the STA's pending to the local pending,
236 * requires a call to ieee80211_agg_splice_finish later
237 */
238static void __acquires(agg_queue)
239ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
240 struct tid_ampdu_tx *tid_tx, u16 tid)
241{
242 struct ieee80211_local *local = sdata->local;
243 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
244 unsigned long flags;
245
246 ieee80211_stop_queue_agg(sdata, tid);
247
248 if (WARN(!tid_tx,
249 "TID %d gone but expected when splicing aggregates from the pending queue\n",
250 tid))
251 return;
252
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);
259 }
260}
261
262static void __releases(agg_queue)
263ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
264{
265 ieee80211_wake_queue_agg(sdata, tid);
266}
267
268static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
269{
270 struct tid_ampdu_tx *tid_tx;
271
272 lockdep_assert_held(&sta->ampdu_mlme.mtx);
273 lockdep_assert_held(&sta->lock);
274
275 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
276
277 /*
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
284 * more.
285 */
286
287 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
288
289 /* future packets must not find the tid_tx struct any more */
290 ieee80211_assign_tid_tx(sta, tid, NULL);
291
292 ieee80211_agg_splice_finish(sta->sdata, tid);
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100293 ieee80211_agg_start_txq(sta, tid, false);
Johannes Berg30bf5f12012-12-28 09:43:03 +0100294
295 kfree_rcu(tid_tx, rcu_head);
296}
297
Johannes Berg67c282c2010-06-10 10:21:43 +0200298int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
Johannes Bergc82c4a82012-07-18 13:31:31 +0200299 enum ieee80211_agg_stop_reason reason)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100300{
Johannes Berg849b7962009-02-10 21:25:54 +0100301 struct ieee80211_local *local = sta->local;
Johannes Berg40b275b2011-05-13 14:15:49 +0200302 struct tid_ampdu_tx *tid_tx;
Sara Sharon50ea05e2015-12-30 16:06:04 +0200303 struct ieee80211_ampdu_params params = {
304 .sta = &sta->sta,
305 .tid = tid,
306 .buf_size = 0,
307 .amsdu = false,
308 .timeout = 0,
309 .ssn = 0,
310 };
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100311 int ret;
Johannes Berga622ab72010-06-10 10:21:39 +0200312
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200313 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200314
Johannes Berg18b559d2012-07-18 13:51:25 +0200315 switch (reason) {
316 case AGG_STOP_DECLINED:
317 case AGG_STOP_LOCAL_REQUEST:
318 case AGG_STOP_PEER_REQUEST:
Sara Sharon50ea05e2015-12-30 16:06:04 +0200319 params.action = IEEE80211_AMPDU_TX_STOP_CONT;
Johannes Berg18b559d2012-07-18 13:51:25 +0200320 break;
321 case AGG_STOP_DESTROY_STA:
Sara Sharon50ea05e2015-12-30 16:06:04 +0200322 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
Johannes Berg18b559d2012-07-18 13:51:25 +0200323 break;
324 default:
325 WARN_ON_ONCE(1);
326 return -EINVAL;
327 }
328
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200329 spin_lock_bh(&sta->lock);
330
Johannes Berg40b275b2011-05-13 14:15:49 +0200331 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
332 if (!tid_tx) {
333 spin_unlock_bh(&sta->lock);
334 return -ENOENT;
335 }
336
Johannes Berg18b559d2012-07-18 13:51:25 +0200337 /*
338 * if we're already stopping ignore any new requests to stop
339 * unless we're destroying it in which case notify the driver
340 */
Johannes Berg24f50a92011-11-24 20:06:14 +0100341 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
342 spin_unlock_bh(&sta->lock);
Johannes Berg18b559d2012-07-18 13:51:25 +0200343 if (reason != AGG_STOP_DESTROY_STA)
344 return -EALREADY;
Sara Sharon50ea05e2015-12-30 16:06:04 +0200345 params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
346 ret = drv_ampdu_action(local, sta->sdata, &params);
Johannes Berg18b559d2012-07-18 13:51:25 +0200347 WARN_ON_ONCE(ret);
Johannes Berg8147dc72013-01-18 23:47:05 +0100348 return 0;
Johannes Berg24f50a92011-11-24 20:06:14 +0100349 }
350
Johannes Berg0ab33702010-06-10 10:21:42 +0200351 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
352 /* not even started yet! */
Johannes Bergec034b22011-05-13 13:35:40 +0200353 ieee80211_assign_tid_tx(sta, tid, NULL);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200354 spin_unlock_bh(&sta->lock);
Lai Jiangshan07443712011-03-15 18:02:42 +0800355 kfree_rcu(tid_tx, rcu_head);
Johannes Berg0ab33702010-06-10 10:21:42 +0200356 return 0;
357 }
358
Johannes Berg24f50a92011-11-24 20:06:14 +0100359 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
360
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200361 spin_unlock_bh(&sta->lock);
362
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200363 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
364 sta->sta.addr, tid);
Johannes Berg827d42c2009-11-22 12:28:41 +0100365
Johannes Berg44271482010-10-05 21:40:33 +0200366 del_timer_sync(&tid_tx->addba_resp_timer);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500367 del_timer_sync(&tid_tx->session_timer);
Johannes Berg44271482010-10-05 21:40:33 +0200368
Johannes Berga622ab72010-06-10 10:21:39 +0200369 /*
370 * After this packets are no longer handed right through
371 * to the driver but are put onto tid_tx->pending instead,
372 * with locking to ensure proper access.
373 */
374 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
Vasanthakumar Thiagarajan736708b2009-06-09 14:11:46 +0530375
Emmanuel Grumbach2a1e0fd2011-11-27 15:29:44 +0200376 /*
377 * There might be a few packets being processed right now (on
378 * another CPU) that have already gotten past the aggregation
379 * check when it was still OPERATIONAL and consequently have
380 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
381 * call into the driver at the same time or even before the
382 * TX paths calls into it, which could confuse the driver.
383 *
384 * Wait for all currently running TX paths to finish before
385 * telling the driver. New packets will not go through since
386 * the aggregation session is no longer OPERATIONAL.
387 */
388 synchronize_net();
389
Johannes Bergc82c4a82012-07-18 13:31:31 +0200390 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
391 WLAN_BACK_RECIPIENT :
392 WLAN_BACK_INITIATOR;
393 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100394
Sara Sharon50ea05e2015-12-30 16:06:04 +0200395 ret = drv_ampdu_action(local, sta->sdata, &params);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100396
397 /* HW shall not deny going back to legacy */
398 if (WARN_ON(ret)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100399 /*
400 * We may have pending packets get stuck in this case...
401 * Not bothering with a workaround for now.
402 */
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100403 }
404
Johannes Berg8147dc72013-01-18 23:47:05 +0100405 /*
406 * In the case of AGG_STOP_DESTROY_STA, the driver won't
407 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
408 * seem like we can leave the tid_tx data pending forever.
409 * This is true, in a way, but "forever" is only until the
410 * station struct is actually destroyed. In the meantime,
411 * leaving it around ensures that we don't transmit packets
412 * to the driver on this TID which might confuse it.
413 */
Johannes Berg18b559d2012-07-18 13:51:25 +0200414
415 return 0;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100416}
417
Johannes Bergb8695a82009-02-10 21:25:46 +0100418/*
419 * After sending add Block Ack request we activated a timer until
420 * add Block Ack response will arrive from the recipient.
421 * If this timer expires sta_addba_resp_timer_expired will be executed.
422 */
423static void sta_addba_resp_timer_expired(unsigned long data)
424{
425 /* not an elegant detour, but there is no choice as the timer passes
426 * only one argument, and both sta_info and TID are needed, so init
427 * flow in sta_info_create gives the TID as data, while the timer_to_id
428 * array gives the sta through container_of */
429 u16 tid = *(u8 *)data;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100430 struct sta_info *sta = container_of((void *)data,
Johannes Bergb8695a82009-02-10 21:25:46 +0100431 struct sta_info, timer_to_tid[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200432 struct tid_ampdu_tx *tid_tx;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100433
Johannes Bergb8695a82009-02-10 21:25:46 +0100434 /* check if the TID waits for addBA response */
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200435 rcu_read_lock();
436 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200437 if (!tid_tx ||
438 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200439 rcu_read_unlock();
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200440 ht_dbg(sta->sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100441 "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n",
442 sta->sta.addr, tid);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100443 return;
Johannes Bergb8695a82009-02-10 21:25:46 +0100444 }
445
Johannes Berg0a214d32013-01-16 10:39:44 +0100446 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
447 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100448
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200449 ieee80211_stop_tx_ba_session(&sta->sta, tid);
450 rcu_read_unlock();
Johannes Bergb8695a82009-02-10 21:25:46 +0100451}
452
Johannes Berg67c282c2010-06-10 10:21:43 +0200453void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
Johannes Berg0ab33702010-06-10 10:21:42 +0200454{
Johannes Berg40b275b2011-05-13 14:15:49 +0200455 struct tid_ampdu_tx *tid_tx;
Johannes Berg0ab33702010-06-10 10:21:42 +0200456 struct ieee80211_local *local = sta->local;
457 struct ieee80211_sub_if_data *sdata = sta->sdata;
Sara Sharon50ea05e2015-12-30 16:06:04 +0200458 struct ieee80211_ampdu_params params = {
459 .sta = &sta->sta,
460 .action = IEEE80211_AMPDU_TX_START,
461 .tid = tid,
462 .buf_size = 0,
463 .amsdu = false,
464 .timeout = 0,
465 };
Johannes Berg0ab33702010-06-10 10:21:42 +0200466 int ret;
467
Johannes Berg40b275b2011-05-13 14:15:49 +0200468 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200469
Johannes Berg0ab33702010-06-10 10:21:42 +0200470 /*
Johannes Berg15062e62011-12-07 09:02:21 +0100471 * Start queuing up packets for this aggregation session.
472 * We're going to release them once the driver is OK with
473 * that.
Johannes Berg0ab33702010-06-10 10:21:42 +0200474 */
Johannes Berg0ab33702010-06-10 10:21:42 +0200475 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
476
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100477 ieee80211_agg_stop_txq(sta, tid);
478
Johannes Berg0ab33702010-06-10 10:21:42 +0200479 /*
Johannes Berg15062e62011-12-07 09:02:21 +0100480 * Make sure no packets are being processed. This ensures that
481 * we have a valid starting sequence number and that in-flight
482 * packets have been flushed out and no packets for this TID
483 * will go into the driver during the ampdu_action call.
Johannes Berg0ab33702010-06-10 10:21:42 +0200484 */
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200485 synchronize_net();
486
Sara Sharon50ea05e2015-12-30 16:06:04 +0200487 params.ssn = sta->tid_seq[tid] >> 4;
488 ret = drv_ampdu_action(local, sdata, &params);
Johannes Berg0ab33702010-06-10 10:21:42 +0200489 if (ret) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200490 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100491 "BA request denied - HW unavailable for %pM tid %d\n",
492 sta->sta.addr, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200493 spin_lock_bh(&sta->lock);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200494 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
Johannes Bergec034b22011-05-13 13:35:40 +0200495 ieee80211_assign_tid_tx(sta, tid, NULL);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200496 ieee80211_agg_splice_finish(sdata, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200497 spin_unlock_bh(&sta->lock);
498
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100499 ieee80211_agg_start_txq(sta, tid, false);
500
Lai Jiangshan07443712011-03-15 18:02:42 +0800501 kfree_rcu(tid_tx, rcu_head);
Johannes Berg0ab33702010-06-10 10:21:42 +0200502 return;
503 }
504
Johannes Berg0ab33702010-06-10 10:21:42 +0200505 /* activate the timer for the recipient's addBA response */
506 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
Johannes Berg0a214d32013-01-16 10:39:44 +0100507 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
508 sta->sta.addr, tid);
Johannes Berg0ab33702010-06-10 10:21:42 +0200509
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200510 spin_lock_bh(&sta->lock);
Nikolay Martynov84381b42011-12-17 19:39:35 -0500511 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
Johannes Berg0ab33702010-06-10 10:21:42 +0200512 sta->ampdu_mlme.addba_req_num[tid]++;
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200513 spin_unlock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200514
515 /* send AddBA request */
516 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
Sara Sharon50ea05e2015-12-30 16:06:04 +0200517 tid_tx->dialog_token, params.ssn,
Gregory Greenmanac062192015-11-17 10:24:38 +0200518 IEEE80211_MAX_AMPDU_BUF,
Johannes Berg5dd36bc2011-01-18 13:52:23 +0100519 tid_tx->timeout);
Johannes Berg0ab33702010-06-10 10:21:42 +0200520}
521
Nikolay Martynov285fa692011-11-22 21:50:28 -0500522/*
523 * After accepting the AddBA Response we activated a timer,
524 * resetting it after each frame that we send.
525 */
526static void sta_tx_agg_session_timer_expired(unsigned long data)
527{
528 /* not an elegant detour, but there is no choice as the timer passes
529 * only one argument, and various sta_info are needed here, so init
530 * flow in sta_info_create gives the TID as data, while the timer_to_id
531 * array gives the sta through container_of */
532 u8 *ptid = (u8 *)data;
533 u8 *timer_to_id = ptid - *ptid;
534 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
535 timer_to_tid[0]);
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100536 struct tid_ampdu_tx *tid_tx;
537 unsigned long timeout;
538
Johannes Berg9e73dee2012-05-07 17:57:36 +0200539 rcu_read_lock();
540 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
541 if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
542 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100543 return;
Johannes Berg9e73dee2012-05-07 17:57:36 +0200544 }
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100545
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);
Johannes Berg9e73dee2012-05-07 17:57:36 +0200549 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100550 return;
551 }
Nikolay Martynov285fa692011-11-22 21:50:28 -0500552
Johannes Berg9e73dee2012-05-07 17:57:36 +0200553 rcu_read_unlock();
554
Johannes Berg0a214d32013-01-16 10:39:44 +0100555 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
556 sta->sta.addr, (u16)*ptid);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500557
558 ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
559}
560
Sujith Manoharanbd2ce6e2010-12-15 07:47:10 +0530561int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
562 u16 timeout)
Johannes Bergb8695a82009-02-10 21:25:46 +0100563{
Johannes Bergc951ad32009-11-16 12:00:38 +0100564 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;
Johannes Berga622ab72010-06-10 10:21:39 +0200567 struct tid_ampdu_tx *tid_tx;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100568 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100569
Johannes Berg8f9c77f2015-03-09 11:13:04 +0100570 trace_api_start_tx_ba_session(pubsta, tid);
571
Liad Kaufmanb6da9112014-11-19 13:47:38 +0200572 if (WARN(sta->reserved_tid == tid,
573 "Requested to start BA session on reserved tid=%d", tid))
574 return -EINVAL;
575
Johannes Berg8f9c77f2015-03-09 11:13:04 +0100576 if (!pubsta->ht_cap.ht_supported)
577 return -EINVAL;
Johannes Bergb5878a22010-04-07 16:48:40 +0200578
Chaitanya50c16e22012-12-07 12:19:34 +0530579 if (WARN_ON_ONCE(!local->ops->ampdu_action))
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100580 return -EINVAL;
581
Johannes Berg5a306f52012-11-14 23:22:21 +0100582 if ((tid >= IEEE80211_NUM_TIDS) ||
Johannes Berg30686bf2015-06-02 21:39:54 +0200583 !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
584 ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
Johannes Bergb8695a82009-02-10 21:25:46 +0100585 return -EINVAL;
586
Johannes Berg85d53132016-09-14 11:38:31 +0200587 if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
588 return -EINVAL;
589
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200590 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
591 pubsta->addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100592
Johannes Bergc951ad32009-11-16 12:00:38 +0100593 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -0700594 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Bergc951ad32009-11-16 12:00:38 +0100595 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +0100596 sdata->vif.type != NL80211_IFTYPE_AP &&
597 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Bergc951ad32009-11-16 12:00:38 +0100598 return -EINVAL;
Johannes Berg8abd3f92009-02-10 21:25:47 +0100599
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200600 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200601 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100602 "BA sessions blocked - Denying BA session request %pM tid %d\n",
603 sta->sta.addr, tid);
Johannes Bergc951ad32009-11-16 12:00:38 +0100604 return -EINVAL;
Sujith722f0692009-03-17 08:50:06 +0530605 }
606
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +0100607 /*
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.
614 *
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.
618 */
619 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
620 !sta->sta.ht_cap.ht_supported) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200621 ht_dbg(sdata,
622 "BA request denied - IBSS STA %pM does not advertise HT support\n",
623 pubsta->addr);
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +0100624 return -EINVAL;
625 }
626
Johannes Bergb8695a82009-02-10 21:25:46 +0100627 spin_lock_bh(&sta->lock);
628
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) {
631 ret = -EBUSY;
632 goto err_unlock_sta;
633 }
634
Nikolay Martynov84381b42011-12-17 19:39:35 -0500635 /*
636 * if we have tried more than HT_AGG_BURST_RETRIES times we
637 * will spread our requests in time to avoid stalling connection
638 * for too long
639 */
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)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200643 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100644 "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n",
645 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
Nikolay Martynov84381b42011-12-17 19:39:35 -0500646 ret = -EBUSY;
647 goto err_unlock_sta;
648 }
649
Johannes Berg40b275b2011-05-13 14:15:49 +0200650 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100651 /* check if the TID is not in aggregation flow already */
Johannes Bergec034b22011-05-13 13:35:40 +0200652 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200653 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100654 "BA request denied - session is not idle on %pM tid %u\n",
655 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100656 ret = -EAGAIN;
657 goto err_unlock_sta;
658 }
659
660 /* prepare A-MPDU MLME for Tx aggregation */
Johannes Berga622ab72010-06-10 10:21:39 +0200661 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
662 if (!tid_tx) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100663 ret = -ENOMEM;
Johannes Berg0ab33702010-06-10 10:21:42 +0200664 goto err_unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100665 }
Johannes Berg96f5e662009-02-12 00:51:53 +0100666
Johannes Berga622ab72010-06-10 10:21:39 +0200667 skb_queue_head_init(&tid_tx->pending);
Johannes Berg0ab33702010-06-10 10:21:42 +0200668 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100669
Sujith Manoharanbd2ce6e2010-12-15 07:47:10 +0530670 tid_tx->timeout = timeout;
671
Nikolay Martynov285fa692011-11-22 21:50:28 -0500672 /* response timer */
Ondřej Lysoněkf8f118c2017-03-03 13:45:35 +0100673 setup_timer(&tid_tx->addba_resp_timer,
674 sta_addba_resp_timer_expired,
675 (unsigned long)&sta->timer_to_tid[tid]);
Johannes Bergb8695a82009-02-10 21:25:46 +0100676
Nikolay Martynov285fa692011-11-22 21:50:28 -0500677 /* tx timer */
Ondřej Lysoněkf8f118c2017-03-03 13:45:35 +0100678 setup_deferrable_timer(&tid_tx->session_timer,
679 sta_tx_agg_session_timer_expired,
680 (unsigned long)&sta->timer_to_tid[tid]);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500681
Johannes Berg0ab33702010-06-10 10:21:42 +0200682 /* assign a dialog token */
Johannes Bergb8695a82009-02-10 21:25:46 +0100683 sta->ampdu_mlme.dialog_token_allocator++;
Johannes Berga622ab72010-06-10 10:21:39 +0200684 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
Johannes Berga622ab72010-06-10 10:21:39 +0200685
Johannes Bergec034b22011-05-13 13:35:40 +0200686 /*
687 * Finally, assign it to the start array; the work item will
688 * collect it and move it to the normal array.
689 */
690 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100691
Johannes Berg0ab33702010-06-10 10:21:42 +0200692 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
Johannes Berg51a0d382010-05-31 12:00:12 +0200693
Johannes Berg0ab33702010-06-10 10:21:42 +0200694 /* this flow continues off the work */
Johannes Berg96f5e662009-02-12 00:51:53 +0100695 err_unlock_sta:
Johannes Bergb8695a82009-02-10 21:25:46 +0100696 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100697 return ret;
698}
699EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
700
Johannes Bergb1720232009-03-23 17:28:39 +0100701static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
702 struct sta_info *sta, u16 tid)
703{
Johannes Berg40b275b2011-05-13 14:15:49 +0200704 struct tid_ampdu_tx *tid_tx;
Sara Sharon50ea05e2015-12-30 16:06:04 +0200705 struct ieee80211_ampdu_params params = {
706 .sta = &sta->sta,
707 .action = IEEE80211_AMPDU_TX_OPERATIONAL,
708 .tid = tid,
709 .timeout = 0,
710 .ssn = 0,
711 };
Johannes Berg40b275b2011-05-13 14:15:49 +0200712
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200713 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200714
Johannes Berg40b275b2011-05-13 14:15:49 +0200715 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Sara Sharon50ea05e2015-12-30 16:06:04 +0200716 params.buf_size = tid_tx->buf_size;
717 params.amsdu = tid_tx->amsdu;
Johannes Berg40b275b2011-05-13 14:15:49 +0200718
Johannes Berg0a214d32013-01-16 10:39:44 +0100719 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
720 sta->sta.addr, tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100721
Sara Sharon50ea05e2015-12-30 16:06:04 +0200722 drv_ampdu_action(local, sta->sdata, &params);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200723
724 /*
725 * synchronize with TX path, while splicing the TX path
726 * should block so it won't put more packets onto pending.
727 */
728 spin_lock_bh(&sta->lock);
729
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200730 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100731 /*
Johannes Berga622ab72010-06-10 10:21:39 +0200732 * Now mark as operational. This will be visible
733 * in the TX path, and lets it go lock-free in
734 * the common case.
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100735 */
Johannes Berg40b275b2011-05-13 14:15:49 +0200736 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200737 ieee80211_agg_splice_finish(sta->sdata, tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100738
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200739 spin_unlock_bh(&sta->lock);
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100740
741 ieee80211_agg_start_txq(sta, tid, true);
Johannes Bergb1720232009-03-23 17:28:39 +0100742}
743
Johannes Bergc951ad32009-11-16 12:00:38 +0100744void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100745{
Johannes Bergc951ad32009-11-16 12:00:38 +0100746 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
747 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100748 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200749 struct tid_ampdu_tx *tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100750
Johannes Bergb5878a22010-04-07 16:48:40 +0200751 trace_api_start_tx_ba_cb(sdata, ra, tid);
752
Johannes Berg5a306f52012-11-14 23:22:21 +0100753 if (tid >= IEEE80211_NUM_TIDS) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200754 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
Johannes Berg5a306f52012-11-14 23:22:21 +0100755 tid, IEEE80211_NUM_TIDS);
Johannes Bergb8695a82009-02-10 21:25:46 +0100756 return;
757 }
758
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200759 mutex_lock(&local->sta_mtx);
Felix Fietkaubc192f82011-11-23 21:09:49 +0700760 sta = sta_info_get_bss(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100761 if (!sta) {
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200762 mutex_unlock(&local->sta_mtx);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200763 ht_dbg(sdata, "Could not find station: %pM\n", ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100764 return;
765 }
766
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200767 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg40b275b2011-05-13 14:15:49 +0200768 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100769
Johannes Berga622ab72010-06-10 10:21:39 +0200770 if (WARN_ON(!tid_tx)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200771 ht_dbg(sdata, "addBA was not requested!\n");
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200772 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100773 }
774
Johannes Berga622ab72010-06-10 10:21:39 +0200775 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200776 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100777
Johannes Berga622ab72010-06-10 10:21:39 +0200778 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +0100779 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100780
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200781 unlock:
782 mutex_unlock(&sta->ampdu_mlme.mtx);
783 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100784}
Johannes Bergb8695a82009-02-10 21:25:46 +0100785
Johannes Bergc951ad32009-11-16 12:00:38 +0100786void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Berg86ab6c52009-02-10 21:25:49 +0100787 const u8 *ra, u16 tid)
788{
Johannes Bergc951ad32009-11-16 12:00:38 +0100789 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
790 struct ieee80211_local *local = sdata->local;
Johannes Berg86ab6c52009-02-10 21:25:49 +0100791 struct ieee80211_ra_tid *ra_tid;
792 struct sk_buff *skb = dev_alloc_skb(0);
793
Joe Perchesd15b8452011-08-29 14:17:31 -0700794 if (unlikely(!skb))
Johannes Berg86ab6c52009-02-10 21:25:49 +0100795 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700796
Johannes Berg86ab6c52009-02-10 21:25:49 +0100797 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
798 memcpy(&ra_tid->ra, ra, ETH_ALEN);
799 ra_tid->tid = tid;
800
Johannes Bergc1475ca2010-06-10 10:21:37 +0200801 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
802 skb_queue_tail(&sdata->skb_queue, skb);
803 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg86ab6c52009-02-10 21:25:49 +0100804}
805EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
806
Johannes Berg849b7962009-02-10 21:25:54 +0100807int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
Johannes Bergc82c4a82012-07-18 13:31:31 +0200808 enum ieee80211_agg_stop_reason reason)
Johannes Berg849b7962009-02-10 21:25:54 +0100809{
Johannes Berg849b7962009-02-10 21:25:54 +0100810 int ret;
811
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200812 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg849b7962009-02-10 21:25:54 +0100813
Johannes Bergc82c4a82012-07-18 13:31:31 +0200814 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
Johannes Berg849b7962009-02-10 21:25:54 +0100815
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200816 mutex_unlock(&sta->ampdu_mlme.mtx);
817
Johannes Berg849b7962009-02-10 21:25:54 +0100818 return ret;
819}
Johannes Bergb8695a82009-02-10 21:25:46 +0100820
Johannes Berg6a8579d2010-05-27 14:41:07 +0200821int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100822{
Johannes Bergc951ad32009-11-16 12:00:38 +0100823 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
824 struct ieee80211_sub_if_data *sdata = sta->sdata;
825 struct ieee80211_local *local = sdata->local;
Johannes Berg0ab33702010-06-10 10:21:42 +0200826 struct tid_ampdu_tx *tid_tx;
827 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100828
Johannes Berg6a8579d2010-05-27 14:41:07 +0200829 trace_api_stop_tx_ba_session(pubsta, tid);
Johannes Bergb5878a22010-04-07 16:48:40 +0200830
Johannes Berg42531192009-11-20 09:15:51 +0100831 if (!local->ops->ampdu_action)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100832 return -EINVAL;
833
Johannes Berg5a306f52012-11-14 23:22:21 +0100834 if (tid >= IEEE80211_NUM_TIDS)
Johannes Bergb8695a82009-02-10 21:25:46 +0100835 return -EINVAL;
836
Johannes Berg0ab33702010-06-10 10:21:42 +0200837 spin_lock_bh(&sta->lock);
Johannes Berg40b275b2011-05-13 14:15:49 +0200838 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berg0ab33702010-06-10 10:21:42 +0200839
840 if (!tid_tx) {
841 ret = -ENOENT;
842 goto unlock;
843 }
844
Liad Kaufmanb6da9112014-11-19 13:47:38 +0200845 WARN(sta->reserved_tid == tid,
846 "Requested to stop BA session on reserved tid=%d", tid);
847
Johannes Berg0ab33702010-06-10 10:21:42 +0200848 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
849 /* already in progress stopping it */
850 ret = 0;
851 goto unlock;
852 }
853
854 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
855 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
856
857 unlock:
858 spin_unlock_bh(&sta->lock);
859 return ret;
Johannes Bergb8695a82009-02-10 21:25:46 +0100860}
861EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
862
Johannes Bergc951ad32009-11-16 12:00:38 +0100863void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100864{
Johannes Bergc951ad32009-11-16 12:00:38 +0100865 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
866 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100867 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200868 struct tid_ampdu_tx *tid_tx;
Johannes Berg2c158882015-03-12 19:28:31 +0100869 bool send_delba = false;
Johannes Bergb8695a82009-02-10 21:25:46 +0100870
Johannes Bergb5878a22010-04-07 16:48:40 +0200871 trace_api_stop_tx_ba_cb(sdata, ra, tid);
872
Johannes Berg5a306f52012-11-14 23:22:21 +0100873 if (tid >= IEEE80211_NUM_TIDS) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200874 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
Johannes Berg5a306f52012-11-14 23:22:21 +0100875 tid, IEEE80211_NUM_TIDS);
Johannes Bergb8695a82009-02-10 21:25:46 +0100876 return;
877 }
878
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200879 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100880
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200881 mutex_lock(&local->sta_mtx);
882
Felix Fietkaubc192f82011-11-23 21:09:49 +0700883 sta = sta_info_get_bss(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100884 if (!sta) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200885 ht_dbg(sdata, "Could not find station: %pM\n", ra);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200886 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100887 }
Johannes Bergb8695a82009-02-10 21:25:46 +0100888
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200889 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200890 spin_lock_bh(&sta->lock);
Johannes Berg40b275b2011-05-13 14:15:49 +0200891 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200892
893 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
Johannes Berg0a214d32013-01-16 10:39:44 +0100894 ht_dbg(sdata,
895 "unexpected callback to A-MPDU stop for %pM tid %d\n",
896 sta->sta.addr, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200897 goto unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100898 }
899
Johannes Berg53f73c02010-10-05 19:37:40 +0200900 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
Johannes Berg2c158882015-03-12 19:28:31 +0100901 send_delba = true;
Johannes Bergb8695a82009-02-10 21:25:46 +0100902
Johannes Bergfaec12e2012-07-18 14:12:44 +0200903 ieee80211_remove_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100904
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200905 unlock_sta:
Johannes Berga622ab72010-06-10 10:21:39 +0200906 spin_unlock_bh(&sta->lock);
Johannes Berg2c158882015-03-12 19:28:31 +0100907
908 if (send_delba)
909 ieee80211_send_delba(sdata, ra, tid,
910 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
911
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200912 mutex_unlock(&sta->ampdu_mlme.mtx);
913 unlock:
914 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100915}
Johannes Bergb8695a82009-02-10 21:25:46 +0100916
Johannes Bergc951ad32009-11-16 12:00:38 +0100917void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Bergb8695a82009-02-10 21:25:46 +0100918 const u8 *ra, u16 tid)
919{
Johannes Bergc951ad32009-11-16 12:00:38 +0100920 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
921 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100922 struct ieee80211_ra_tid *ra_tid;
923 struct sk_buff *skb = dev_alloc_skb(0);
924
Joe Perchesd15b8452011-08-29 14:17:31 -0700925 if (unlikely(!skb))
Johannes Bergb8695a82009-02-10 21:25:46 +0100926 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700927
Johannes Bergb8695a82009-02-10 21:25:46 +0100928 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
929 memcpy(&ra_tid->ra, ra, ETH_ALEN);
930 ra_tid->tid = tid;
931
Johannes Bergc1475ca2010-06-10 10:21:37 +0200932 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
933 skb_queue_tail(&sdata->skb_queue, skb);
934 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergb8695a82009-02-10 21:25:46 +0100935}
936EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
937
Johannes Berg86ab6c52009-02-10 21:25:49 +0100938
Johannes Bergb8695a82009-02-10 21:25:46 +0100939void ieee80211_process_addba_resp(struct ieee80211_local *local,
940 struct sta_info *sta,
941 struct ieee80211_mgmt *mgmt,
942 size_t len)
943{
Johannes Berga622ab72010-06-10 10:21:39 +0200944 struct tid_ampdu_tx *tid_tx;
Felix Fietkau6e0456b2016-03-03 22:59:00 +0100945 struct ieee80211_txq *txq;
Johannes Bergb1720232009-03-23 17:28:39 +0100946 u16 capab, tid;
Johannes Berg0b01f032011-01-18 13:51:05 +0100947 u8 buf_size;
Emmanuel Grumbache3abc8f2015-08-16 11:13:22 +0300948 bool amsdu;
Johannes Bergb8695a82009-02-10 21:25:46 +0100949
950 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
Emmanuel Grumbache3abc8f2015-08-16 11:13:22 +0300951 amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
Johannes Bergb8695a82009-02-10 21:25:46 +0100952 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
Johannes Berg0b01f032011-01-18 13:51:05 +0100953 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
Gregory Greenmanac062192015-11-17 10:24:38 +0200954 buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
Johannes Bergb8695a82009-02-10 21:25:46 +0100955
Felix Fietkau6e0456b2016-03-03 22:59:00 +0100956 txq = sta->sta.txq[tid];
957 if (!amsdu && txq)
958 set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
959
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200960 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100961
Johannes Berg40b275b2011-05-13 14:15:49 +0200962 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200963 if (!tid_tx)
Johannes Berg8ade0082009-11-18 17:15:06 +0100964 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100965
Johannes Berga622ab72010-06-10 10:21:39 +0200966 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
Johannes Berg0a214d32013-01-16 10:39:44 +0100967 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
968 sta->sta.addr, tid);
Johannes Berg8ade0082009-11-18 17:15:06 +0100969 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100970 }
971
Nikolay Martynovd305a652011-11-28 09:18:00 +0100972 del_timer_sync(&tid_tx->addba_resp_timer);
Johannes Berg8ade0082009-11-18 17:15:06 +0100973
Johannes Berg0a214d32013-01-16 10:39:44 +0100974 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
975 sta->sta.addr, tid);
Nikolay Martynovd305a652011-11-28 09:18:00 +0100976
977 /*
978 * addba_resp_timer may have fired before we got here, and
979 * caused WANT_STOP to be set. If the stop then was already
980 * processed further, STOPPING might be set.
981 */
982 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
983 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200984 ht_dbg(sta->sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100985 "got addBA resp for %pM tid %d but we already gave up\n",
986 sta->sta.addr, tid);
Nikolay Martynovd305a652011-11-28 09:18:00 +0100987 goto out;
988 }
989
Helmut Schaa3ca97882011-07-26 12:18:27 +0200990 /*
991 * IEEE 802.11-2007 7.3.1.14:
992 * In an ADDBA Response frame, when the Status Code field
993 * is set to 0, the Buffer Size subfield is set to a value
994 * of at least 1.
995 */
Johannes Bergb8695a82009-02-10 21:25:46 +0100996 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
Helmut Schaa3ca97882011-07-26 12:18:27 +0200997 == WLAN_STATUS_SUCCESS && buf_size) {
Johannes Berga622ab72010-06-10 10:21:39 +0200998 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
999 &tid_tx->state)) {
1000 /* ignore duplicate response */
1001 goto out;
1002 }
Johannes Bergb8695a82009-02-10 21:25:46 +01001003
Johannes Berg0b01f032011-01-18 13:51:05 +01001004 tid_tx->buf_size = buf_size;
Emmanuel Grumbache3abc8f2015-08-16 11:13:22 +03001005 tid_tx->amsdu = amsdu;
Johannes Berg0b01f032011-01-18 13:51:05 +01001006
Johannes Berga622ab72010-06-10 10:21:39 +02001007 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +01001008 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +01001009
Johannes Bergb1720232009-03-23 17:28:39 +01001010 sta->ampdu_mlme.addba_req_num[tid] = 0;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001011
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001012 if (tid_tx->timeout) {
Nikolay Martynov285fa692011-11-22 21:50:28 -05001013 mod_timer(&tid_tx->session_timer,
1014 TU_TO_EXP_TIME(tid_tx->timeout));
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001015 tid_tx->last_tx = jiffies;
1016 }
Nikolay Martynov285fa692011-11-22 21:50:28 -05001017
Johannes Bergb8695a82009-02-10 21:25:46 +01001018 } else {
Johannes Bergc82c4a82012-07-18 13:31:31 +02001019 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
Johannes Bergb8695a82009-02-10 21:25:46 +01001020 }
Johannes Berg2171abc2009-10-29 08:34:00 +01001021
Johannes Berg2171abc2009-10-29 08:34:00 +01001022 out:
Johannes Bergcfcdbde2010-06-10 10:21:48 +02001023 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +01001024}