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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
Johannes Bergb8695a82009-02-10 21:25:46 +010010 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/ieee80211.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040018#include <linux/export.h>
Johannes Bergb8695a82009-02-10 21:25:46 +010019#include <net/mac80211.h>
20#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020021#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010022#include "wme.h"
23
Johannes Berg86ab6c52009-02-10 21:25:49 +010024/**
Johannes Berg73a72a82010-06-10 10:21:50 +020025 * DOC: TX A-MPDU aggregation
Johannes Berg86ab6c52009-02-10 21:25:49 +010026 *
27 * Aggregation on the TX side requires setting the hardware flag
Johannes Berg73a72a82010-06-10 10:21:50 +020028 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
29 * packets with a flag indicating A-MPDU aggregation. The driver
30 * or device is responsible for actually aggregating the frames,
31 * as well as deciding how many and which to aggregate.
Johannes Berg86ab6c52009-02-10 21:25:49 +010032 *
Johannes Berg73a72a82010-06-10 10:21:50 +020033 * When TX aggregation is started by some subsystem (usually the rate
34 * control algorithm would be appropriate) by calling the
35 * ieee80211_start_tx_ba_session() function, the driver will be
36 * notified via its @ampdu_action function, with the
37 * %IEEE80211_AMPDU_TX_START action.
Johannes Berg86ab6c52009-02-10 21:25:49 +010038 *
39 * In response to that, the driver is later required to call the
Johannes Berg73a72a82010-06-10 10:21:50 +020040 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
41 * start the aggregation session after the peer has also responded.
42 * If the peer responds negatively, the session will be stopped
43 * again right away. Note that it is possible for the aggregation
44 * session to be stopped before the driver has indicated that it
45 * is done setting it up, in which case it must not indicate the
46 * setup completion.
Johannes Berg86ab6c52009-02-10 21:25:49 +010047 *
Johannes Berg73a72a82010-06-10 10:21:50 +020048 * Also note that, since we also need to wait for a response from
49 * the peer, the driver is notified of the completion of the
50 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
51 * @ampdu_action callback.
52 *
53 * Similarly, when the aggregation session is stopped by the peer
54 * or something calling ieee80211_stop_tx_ba_session(), the driver's
55 * @ampdu_action function will be called with the action
56 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
57 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +053058 * Note that the sta can get destroyed before the BA tear down is
59 * complete.
Johannes Berg86ab6c52009-02-10 21:25:49 +010060 */
61
Johannes Bergb8695a82009-02-10 21:25:46 +010062static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
63 const u8 *da, u16 tid,
64 u8 dialog_token, u16 start_seq_num,
65 u16 agg_size, u16 timeout)
66{
67 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +010068 struct sk_buff *skb;
69 struct ieee80211_mgmt *mgmt;
70 u16 capab;
71
72 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
73
Joe Perchesd15b8452011-08-29 14:17:31 -070074 if (!skb)
Johannes Bergb8695a82009-02-10 21:25:46 +010075 return;
Joe Perchesd15b8452011-08-29 14:17:31 -070076
Johannes Bergb8695a82009-02-10 21:25:46 +010077 skb_reserve(skb, local->hw.extra_tx_headroom);
78 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
79 memset(mgmt, 0, 24);
80 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +010081 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +010082 if (sdata->vif.type == NL80211_IFTYPE_AP ||
Thomas Pedersenae2772b2011-10-26 14:47:29 -070083 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
84 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Johannes Berg47846c92009-11-25 17:46:19 +010085 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010086 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
87 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Alexander Simon13c40c52011-11-30 16:56:34 +010088 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
89 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +010090
91 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
92 IEEE80211_STYPE_ACTION);
93
94 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
95
96 mgmt->u.action.category = WLAN_CATEGORY_BACK;
97 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
98
99 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
100 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
101 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
102 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
103
104 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
105
106 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
107 mgmt->u.action.u.addba_req.start_seq_num =
108 cpu_to_le16(start_seq_num << 4);
109
Karl Beldanc6e13322014-01-23 20:06:34 +0100110 ieee80211_tx_skb(sdata, skb);
Johannes Bergb8695a82009-02-10 21:25:46 +0100111}
112
Felix Fietkau8c771242011-08-20 15:53:55 +0200113void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
Johannes Bergb8695a82009-02-10 21:25:46 +0100114{
Felix Fietkau8c771242011-08-20 15:53:55 +0200115 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
Johannes Bergb8695a82009-02-10 21:25:46 +0100116 struct ieee80211_local *local = sdata->local;
117 struct sk_buff *skb;
118 struct ieee80211_bar *bar;
119 u16 bar_control = 0;
120
121 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
Joe Perchesd15b8452011-08-29 14:17:31 -0700122 if (!skb)
Johannes Bergb8695a82009-02-10 21:25:46 +0100123 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700124
Johannes Bergb8695a82009-02-10 21:25:46 +0100125 skb_reserve(skb, local->hw.extra_tx_headroom);
126 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
127 memset(bar, 0, sizeof(*bar));
128 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
129 IEEE80211_STYPE_BACK_REQ);
130 memcpy(bar->ra, ra, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100131 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +0100132 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
133 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
Helmut Schaac1407b62011-08-11 16:17:41 +0200134 bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
Johannes Bergb8695a82009-02-10 21:25:46 +0100135 bar->control = cpu_to_le16(bar_control);
136 bar->start_seq_num = cpu_to_le16(ssn);
137
Christian Lamparter2f7916f2012-07-07 15:13:08 +0200138 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
139 IEEE80211_TX_CTL_REQ_TX_STATUS;
Helmut Schaacf6bb792011-12-15 10:18:34 +0100140 ieee80211_tx_skb_tid(sdata, skb, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100141}
Felix Fietkau8c771242011-08-20 15:53:55 +0200142EXPORT_SYMBOL(ieee80211_send_bar);
Johannes Bergb8695a82009-02-10 21:25:46 +0100143
Johannes Bergec034b22011-05-13 13:35:40 +0200144void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
145 struct tid_ampdu_tx *tid_tx)
146{
147 lockdep_assert_held(&sta->ampdu_mlme.mtx);
148 lockdep_assert_held(&sta->lock);
149 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
150}
151
Johannes Berg30bf5f12012-12-28 09:43:03 +0100152/*
153 * When multiple aggregation sessions on multiple stations
154 * are being created/destroyed simultaneously, we need to
155 * refcount the global queue stop caused by that in order
156 * to not get into a situation where one of the aggregation
157 * setup or teardown re-enables queues before the other is
158 * ready to handle that.
159 *
160 * These two functions take care of this issue by keeping
161 * a global "agg_queue_stop" refcount.
162 */
163static void __acquires(agg_queue)
164ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
165{
166 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
167
Luciano Coelhocca07b02014-06-13 16:30:05 +0300168 /* we do refcounting here, so don't use the queue reason refcounting */
169
Johannes Berg30bf5f12012-12-28 09:43:03 +0100170 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
171 ieee80211_stop_queue_by_reason(
172 &sdata->local->hw, queue,
Luciano Coelhocca07b02014-06-13 16:30:05 +0300173 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
174 false);
Johannes Berg30bf5f12012-12-28 09:43:03 +0100175 __acquire(agg_queue);
176}
177
178static void __releases(agg_queue)
179ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
180{
181 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
182
183 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
184 ieee80211_wake_queue_by_reason(
185 &sdata->local->hw, queue,
Luciano Coelhocca07b02014-06-13 16:30:05 +0300186 IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
187 false);
Johannes Berg30bf5f12012-12-28 09:43:03 +0100188 __release(agg_queue);
189}
190
191/*
192 * splice packets from the STA's pending to the local pending,
193 * requires a call to ieee80211_agg_splice_finish later
194 */
195static void __acquires(agg_queue)
196ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
197 struct tid_ampdu_tx *tid_tx, u16 tid)
198{
199 struct ieee80211_local *local = sdata->local;
200 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
201 unsigned long flags;
202
203 ieee80211_stop_queue_agg(sdata, tid);
204
205 if (WARN(!tid_tx,
206 "TID %d gone but expected when splicing aggregates from the pending queue\n",
207 tid))
208 return;
209
210 if (!skb_queue_empty(&tid_tx->pending)) {
211 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
212 /* copy over remaining packets */
213 skb_queue_splice_tail_init(&tid_tx->pending,
214 &local->pending[queue]);
215 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
216 }
217}
218
219static void __releases(agg_queue)
220ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
221{
222 ieee80211_wake_queue_agg(sdata, tid);
223}
224
225static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
226{
227 struct tid_ampdu_tx *tid_tx;
228
229 lockdep_assert_held(&sta->ampdu_mlme.mtx);
230 lockdep_assert_held(&sta->lock);
231
232 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
233
234 /*
235 * When we get here, the TX path will not be lockless any more wrt.
236 * aggregation, since the OPERATIONAL bit has long been cleared.
237 * Thus it will block on getting the lock, if it occurs. So if we
238 * stop the queue now, we will not get any more packets, and any
239 * that might be being processed will wait for us here, thereby
240 * guaranteeing that no packets go to the tid_tx pending queue any
241 * more.
242 */
243
244 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
245
246 /* future packets must not find the tid_tx struct any more */
247 ieee80211_assign_tid_tx(sta, tid, NULL);
248
249 ieee80211_agg_splice_finish(sta->sdata, tid);
250
251 kfree_rcu(tid_tx, rcu_head);
252}
253
Johannes Berg67c282c2010-06-10 10:21:43 +0200254int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
Johannes Bergc82c4a82012-07-18 13:31:31 +0200255 enum ieee80211_agg_stop_reason reason)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100256{
Johannes Berg849b7962009-02-10 21:25:54 +0100257 struct ieee80211_local *local = sta->local;
Johannes Berg40b275b2011-05-13 14:15:49 +0200258 struct tid_ampdu_tx *tid_tx;
Johannes Berg18b559d2012-07-18 13:51:25 +0200259 enum ieee80211_ampdu_mlme_action action;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100260 int ret;
Johannes Berga622ab72010-06-10 10:21:39 +0200261
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200262 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200263
Johannes Berg18b559d2012-07-18 13:51:25 +0200264 switch (reason) {
265 case AGG_STOP_DECLINED:
266 case AGG_STOP_LOCAL_REQUEST:
267 case AGG_STOP_PEER_REQUEST:
268 action = IEEE80211_AMPDU_TX_STOP_CONT;
269 break;
270 case AGG_STOP_DESTROY_STA:
271 action = IEEE80211_AMPDU_TX_STOP_FLUSH;
272 break;
273 default:
274 WARN_ON_ONCE(1);
275 return -EINVAL;
276 }
277
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200278 spin_lock_bh(&sta->lock);
279
Johannes Berg40b275b2011-05-13 14:15:49 +0200280 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
281 if (!tid_tx) {
282 spin_unlock_bh(&sta->lock);
283 return -ENOENT;
284 }
285
Johannes Berg18b559d2012-07-18 13:51:25 +0200286 /*
287 * if we're already stopping ignore any new requests to stop
288 * unless we're destroying it in which case notify the driver
289 */
Johannes Berg24f50a92011-11-24 20:06:14 +0100290 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
291 spin_unlock_bh(&sta->lock);
Johannes Berg18b559d2012-07-18 13:51:25 +0200292 if (reason != AGG_STOP_DESTROY_STA)
293 return -EALREADY;
294 ret = drv_ampdu_action(local, sta->sdata,
295 IEEE80211_AMPDU_TX_STOP_FLUSH_CONT,
296 &sta->sta, tid, NULL, 0);
297 WARN_ON_ONCE(ret);
Johannes Berg8147dc72013-01-18 23:47:05 +0100298 return 0;
Johannes Berg24f50a92011-11-24 20:06:14 +0100299 }
300
Johannes Berg0ab33702010-06-10 10:21:42 +0200301 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
302 /* not even started yet! */
Johannes Bergec034b22011-05-13 13:35:40 +0200303 ieee80211_assign_tid_tx(sta, tid, NULL);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200304 spin_unlock_bh(&sta->lock);
Lai Jiangshan07443712011-03-15 18:02:42 +0800305 kfree_rcu(tid_tx, rcu_head);
Johannes Berg0ab33702010-06-10 10:21:42 +0200306 return 0;
307 }
308
Johannes Berg24f50a92011-11-24 20:06:14 +0100309 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
310
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200311 spin_unlock_bh(&sta->lock);
312
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200313 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
314 sta->sta.addr, tid);
Johannes Berg827d42c2009-11-22 12:28:41 +0100315
Johannes Berg442714882010-10-05 21:40:33 +0200316 del_timer_sync(&tid_tx->addba_resp_timer);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500317 del_timer_sync(&tid_tx->session_timer);
Johannes Berg442714882010-10-05 21:40:33 +0200318
Johannes Berga622ab72010-06-10 10:21:39 +0200319 /*
320 * After this packets are no longer handed right through
321 * to the driver but are put onto tid_tx->pending instead,
322 * with locking to ensure proper access.
323 */
324 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
Vasanthakumar Thiagarajan736708b2009-06-09 14:11:46 +0530325
Emmanuel Grumbach2a1e0fd2011-11-27 15:29:44 +0200326 /*
327 * There might be a few packets being processed right now (on
328 * another CPU) that have already gotten past the aggregation
329 * check when it was still OPERATIONAL and consequently have
330 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
331 * call into the driver at the same time or even before the
332 * TX paths calls into it, which could confuse the driver.
333 *
334 * Wait for all currently running TX paths to finish before
335 * telling the driver. New packets will not go through since
336 * the aggregation session is no longer OPERATIONAL.
337 */
338 synchronize_net();
339
Johannes Bergc82c4a82012-07-18 13:31:31 +0200340 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
341 WLAN_BACK_RECIPIENT :
342 WLAN_BACK_INITIATOR;
343 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100344
Johannes Berg18b559d2012-07-18 13:51:25 +0200345 ret = drv_ampdu_action(local, sta->sdata, action,
Johannes Berg0b01f032011-01-18 13:51:05 +0100346 &sta->sta, tid, NULL, 0);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100347
348 /* HW shall not deny going back to legacy */
349 if (WARN_ON(ret)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100350 /*
351 * We may have pending packets get stuck in this case...
352 * Not bothering with a workaround for now.
353 */
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100354 }
355
Johannes Berg8147dc72013-01-18 23:47:05 +0100356 /*
357 * In the case of AGG_STOP_DESTROY_STA, the driver won't
358 * necessarily call ieee80211_stop_tx_ba_cb(), so this may
359 * seem like we can leave the tid_tx data pending forever.
360 * This is true, in a way, but "forever" is only until the
361 * station struct is actually destroyed. In the meantime,
362 * leaving it around ensures that we don't transmit packets
363 * to the driver on this TID which might confuse it.
364 */
Johannes Berg18b559d2012-07-18 13:51:25 +0200365
366 return 0;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100367}
368
Johannes Bergb8695a82009-02-10 21:25:46 +0100369/*
370 * After sending add Block Ack request we activated a timer until
371 * add Block Ack response will arrive from the recipient.
372 * If this timer expires sta_addba_resp_timer_expired will be executed.
373 */
374static void sta_addba_resp_timer_expired(unsigned long data)
375{
376 /* not an elegant detour, but there is no choice as the timer passes
377 * only one argument, and both sta_info and TID are needed, so init
378 * flow in sta_info_create gives the TID as data, while the timer_to_id
379 * array gives the sta through container_of */
380 u16 tid = *(u8 *)data;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100381 struct sta_info *sta = container_of((void *)data,
Johannes Bergb8695a82009-02-10 21:25:46 +0100382 struct sta_info, timer_to_tid[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200383 struct tid_ampdu_tx *tid_tx;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100384
Johannes Bergb8695a82009-02-10 21:25:46 +0100385 /* check if the TID waits for addBA response */
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200386 rcu_read_lock();
387 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200388 if (!tid_tx ||
389 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200390 rcu_read_unlock();
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200391 ht_dbg(sta->sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100392 "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n",
393 sta->sta.addr, tid);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100394 return;
Johannes Bergb8695a82009-02-10 21:25:46 +0100395 }
396
Johannes Berg0a214d32013-01-16 10:39:44 +0100397 ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
398 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100399
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200400 ieee80211_stop_tx_ba_session(&sta->sta, tid);
401 rcu_read_unlock();
Johannes Bergb8695a82009-02-10 21:25:46 +0100402}
403
Johannes Berg67c282c2010-06-10 10:21:43 +0200404void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
Johannes Berg0ab33702010-06-10 10:21:42 +0200405{
Johannes Berg40b275b2011-05-13 14:15:49 +0200406 struct tid_ampdu_tx *tid_tx;
Johannes Berg0ab33702010-06-10 10:21:42 +0200407 struct ieee80211_local *local = sta->local;
408 struct ieee80211_sub_if_data *sdata = sta->sdata;
409 u16 start_seq_num;
410 int ret;
411
Johannes Berg40b275b2011-05-13 14:15:49 +0200412 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200413
Johannes Berg0ab33702010-06-10 10:21:42 +0200414 /*
Johannes Berg15062e62011-12-07 09:02:21 +0100415 * Start queuing up packets for this aggregation session.
416 * We're going to release them once the driver is OK with
417 * that.
Johannes Berg0ab33702010-06-10 10:21:42 +0200418 */
Johannes Berg0ab33702010-06-10 10:21:42 +0200419 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
420
421 /*
Johannes Berg15062e62011-12-07 09:02:21 +0100422 * Make sure no packets are being processed. This ensures that
423 * we have a valid starting sequence number and that in-flight
424 * packets have been flushed out and no packets for this TID
425 * will go into the driver during the ampdu_action call.
Johannes Berg0ab33702010-06-10 10:21:42 +0200426 */
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200427 synchronize_net();
428
Johannes Berg0ab33702010-06-10 10:21:42 +0200429 start_seq_num = sta->tid_seq[tid] >> 4;
430
431 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
Johannes Berg0b01f032011-01-18 13:51:05 +0100432 &sta->sta, tid, &start_seq_num, 0);
Johannes Berg0ab33702010-06-10 10:21:42 +0200433 if (ret) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200434 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100435 "BA request denied - HW unavailable for %pM tid %d\n",
436 sta->sta.addr, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200437 spin_lock_bh(&sta->lock);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200438 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
Johannes Bergec034b22011-05-13 13:35:40 +0200439 ieee80211_assign_tid_tx(sta, tid, NULL);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200440 ieee80211_agg_splice_finish(sdata, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200441 spin_unlock_bh(&sta->lock);
442
Lai Jiangshan07443712011-03-15 18:02:42 +0800443 kfree_rcu(tid_tx, rcu_head);
Johannes Berg0ab33702010-06-10 10:21:42 +0200444 return;
445 }
446
Johannes Berg0ab33702010-06-10 10:21:42 +0200447 /* activate the timer for the recipient's addBA response */
448 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
Johannes Berg0a214d32013-01-16 10:39:44 +0100449 ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
450 sta->sta.addr, tid);
Johannes Berg0ab33702010-06-10 10:21:42 +0200451
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200452 spin_lock_bh(&sta->lock);
Nikolay Martynov84381b42011-12-17 19:39:35 -0500453 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
Johannes Berg0ab33702010-06-10 10:21:42 +0200454 sta->ampdu_mlme.addba_req_num[tid]++;
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200455 spin_unlock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200456
457 /* send AddBA request */
458 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
459 tid_tx->dialog_token, start_seq_num,
Johannes Berg5dd36bc2011-01-18 13:52:23 +0100460 local->hw.max_tx_aggregation_subframes,
461 tid_tx->timeout);
Johannes Berg0ab33702010-06-10 10:21:42 +0200462}
463
Nikolay Martynov285fa692011-11-22 21:50:28 -0500464/*
465 * After accepting the AddBA Response we activated a timer,
466 * resetting it after each frame that we send.
467 */
468static void sta_tx_agg_session_timer_expired(unsigned long data)
469{
470 /* not an elegant detour, but there is no choice as the timer passes
471 * only one argument, and various sta_info are needed here, so init
472 * flow in sta_info_create gives the TID as data, while the timer_to_id
473 * array gives the sta through container_of */
474 u8 *ptid = (u8 *)data;
475 u8 *timer_to_id = ptid - *ptid;
476 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
477 timer_to_tid[0]);
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100478 struct tid_ampdu_tx *tid_tx;
479 unsigned long timeout;
480
Johannes Berg9e73dee2012-05-07 17:57:36 +0200481 rcu_read_lock();
482 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
483 if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
484 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100485 return;
Johannes Berg9e73dee2012-05-07 17:57:36 +0200486 }
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100487
488 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
489 if (time_is_after_jiffies(timeout)) {
490 mod_timer(&tid_tx->session_timer, timeout);
Johannes Berg9e73dee2012-05-07 17:57:36 +0200491 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100492 return;
493 }
Nikolay Martynov285fa692011-11-22 21:50:28 -0500494
Johannes Berg9e73dee2012-05-07 17:57:36 +0200495 rcu_read_unlock();
496
Johannes Berg0a214d32013-01-16 10:39:44 +0100497 ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
498 sta->sta.addr, (u16)*ptid);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500499
500 ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
501}
502
Sujith Manoharanbd2ce6e2010-12-15 07:47:10 +0530503int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
504 u16 timeout)
Johannes Bergb8695a82009-02-10 21:25:46 +0100505{
Johannes Bergc951ad32009-11-16 12:00:38 +0100506 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
507 struct ieee80211_sub_if_data *sdata = sta->sdata;
508 struct ieee80211_local *local = sdata->local;
Johannes Berga622ab72010-06-10 10:21:39 +0200509 struct tid_ampdu_tx *tid_tx;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100510 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100511
Liad Kaufmanb6da9112014-11-19 13:47:38 +0200512 if (WARN(sta->reserved_tid == tid,
513 "Requested to start BA session on reserved tid=%d", tid))
514 return -EINVAL;
515
Johannes Bergb5878a22010-04-07 16:48:40 +0200516 trace_api_start_tx_ba_session(pubsta, tid);
517
Chaitanya50c16e22012-12-07 12:19:34 +0530518 if (WARN_ON_ONCE(!local->ops->ampdu_action))
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100519 return -EINVAL;
520
Johannes Berg5a306f52012-11-14 23:22:21 +0100521 if ((tid >= IEEE80211_NUM_TIDS) ||
Arik Nemtsovedf6b782011-08-30 09:32:38 +0300522 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
523 (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
Johannes Bergb8695a82009-02-10 21:25:46 +0100524 return -EINVAL;
525
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200526 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
527 pubsta->addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100528
Johannes Bergc951ad32009-11-16 12:00:38 +0100529 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -0700530 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Bergc951ad32009-11-16 12:00:38 +0100531 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +0100532 sdata->vif.type != NL80211_IFTYPE_AP &&
533 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Bergc951ad32009-11-16 12:00:38 +0100534 return -EINVAL;
Johannes Berg8abd3f92009-02-10 21:25:47 +0100535
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200536 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200537 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100538 "BA sessions blocked - Denying BA session request %pM tid %d\n",
539 sta->sta.addr, tid);
Johannes Bergc951ad32009-11-16 12:00:38 +0100540 return -EINVAL;
Sujith722f0692009-03-17 08:50:06 +0530541 }
542
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +0100543 /*
544 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
545 * member of an IBSS, and has no other existing Block Ack agreement
546 * with the recipient STA, then the initiating STA shall transmit a
547 * Probe Request frame to the recipient STA and shall not transmit an
548 * ADDBA Request frame unless it receives a Probe Response frame
549 * from the recipient within dot11ADDBAFailureTimeout.
550 *
551 * The probe request mechanism for ADDBA is currently not implemented,
552 * but we only build up Block Ack session with HT STAs. This information
553 * is set when we receive a bss info from a probe response or a beacon.
554 */
555 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
556 !sta->sta.ht_cap.ht_supported) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200557 ht_dbg(sdata,
558 "BA request denied - IBSS STA %pM does not advertise HT support\n",
559 pubsta->addr);
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +0100560 return -EINVAL;
561 }
562
Johannes Bergb8695a82009-02-10 21:25:46 +0100563 spin_lock_bh(&sta->lock);
564
565 /* we have tried too many times, receiver does not want A-MPDU */
566 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
567 ret = -EBUSY;
568 goto err_unlock_sta;
569 }
570
Nikolay Martynov84381b42011-12-17 19:39:35 -0500571 /*
572 * if we have tried more than HT_AGG_BURST_RETRIES times we
573 * will spread our requests in time to avoid stalling connection
574 * for too long
575 */
576 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
577 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
578 HT_AGG_RETRIES_PERIOD)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200579 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100580 "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n",
581 sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
Nikolay Martynov84381b42011-12-17 19:39:35 -0500582 ret = -EBUSY;
583 goto err_unlock_sta;
584 }
585
Johannes Berg40b275b2011-05-13 14:15:49 +0200586 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100587 /* check if the TID is not in aggregation flow already */
Johannes Bergec034b22011-05-13 13:35:40 +0200588 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200589 ht_dbg(sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100590 "BA request denied - session is not idle on %pM tid %u\n",
591 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100592 ret = -EAGAIN;
593 goto err_unlock_sta;
594 }
595
596 /* prepare A-MPDU MLME for Tx aggregation */
Johannes Berga622ab72010-06-10 10:21:39 +0200597 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
598 if (!tid_tx) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100599 ret = -ENOMEM;
Johannes Berg0ab33702010-06-10 10:21:42 +0200600 goto err_unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100601 }
Johannes Berg96f5e662009-02-12 00:51:53 +0100602
Johannes Berga622ab72010-06-10 10:21:39 +0200603 skb_queue_head_init(&tid_tx->pending);
Johannes Berg0ab33702010-06-10 10:21:42 +0200604 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100605
Sujith Manoharanbd2ce6e2010-12-15 07:47:10 +0530606 tid_tx->timeout = timeout;
607
Nikolay Martynov285fa692011-11-22 21:50:28 -0500608 /* response timer */
Johannes Berga622ab72010-06-10 10:21:39 +0200609 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
610 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
611 init_timer(&tid_tx->addba_resp_timer);
Johannes Bergb8695a82009-02-10 21:25:46 +0100612
Nikolay Martynov285fa692011-11-22 21:50:28 -0500613 /* tx timer */
614 tid_tx->session_timer.function = sta_tx_agg_session_timer_expired;
615 tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100616 init_timer_deferrable(&tid_tx->session_timer);
Nikolay Martynov285fa692011-11-22 21:50:28 -0500617
Johannes Berg0ab33702010-06-10 10:21:42 +0200618 /* assign a dialog token */
Johannes Bergb8695a82009-02-10 21:25:46 +0100619 sta->ampdu_mlme.dialog_token_allocator++;
Johannes Berga622ab72010-06-10 10:21:39 +0200620 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
Johannes Berga622ab72010-06-10 10:21:39 +0200621
Johannes Bergec034b22011-05-13 13:35:40 +0200622 /*
623 * Finally, assign it to the start array; the work item will
624 * collect it and move it to the normal array.
625 */
626 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100627
Johannes Berg0ab33702010-06-10 10:21:42 +0200628 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
Johannes Berg51a0d382010-05-31 12:00:12 +0200629
Johannes Berg0ab33702010-06-10 10:21:42 +0200630 /* this flow continues off the work */
Johannes Berg96f5e662009-02-12 00:51:53 +0100631 err_unlock_sta:
Johannes Bergb8695a82009-02-10 21:25:46 +0100632 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100633 return ret;
634}
635EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
636
Johannes Bergb1720232009-03-23 17:28:39 +0100637static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
638 struct sta_info *sta, u16 tid)
639{
Johannes Berg40b275b2011-05-13 14:15:49 +0200640 struct tid_ampdu_tx *tid_tx;
641
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200642 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200643
Johannes Berg40b275b2011-05-13 14:15:49 +0200644 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
645
Johannes Berg0a214d32013-01-16 10:39:44 +0100646 ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
647 sta->sta.addr, tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100648
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200649 drv_ampdu_action(local, sta->sdata,
650 IEEE80211_AMPDU_TX_OPERATIONAL,
Johannes Berg40b275b2011-05-13 14:15:49 +0200651 &sta->sta, tid, NULL, tid_tx->buf_size);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200652
653 /*
654 * synchronize with TX path, while splicing the TX path
655 * should block so it won't put more packets onto pending.
656 */
657 spin_lock_bh(&sta->lock);
658
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200659 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100660 /*
Johannes Berga622ab72010-06-10 10:21:39 +0200661 * Now mark as operational. This will be visible
662 * in the TX path, and lets it go lock-free in
663 * the common case.
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100664 */
Johannes Berg40b275b2011-05-13 14:15:49 +0200665 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200666 ieee80211_agg_splice_finish(sta->sdata, tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100667
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200668 spin_unlock_bh(&sta->lock);
Johannes Bergb1720232009-03-23 17:28:39 +0100669}
670
Johannes Bergc951ad32009-11-16 12:00:38 +0100671void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100672{
Johannes Bergc951ad32009-11-16 12:00:38 +0100673 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
674 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100675 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200676 struct tid_ampdu_tx *tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100677
Johannes Bergb5878a22010-04-07 16:48:40 +0200678 trace_api_start_tx_ba_cb(sdata, ra, tid);
679
Johannes Berg5a306f52012-11-14 23:22:21 +0100680 if (tid >= IEEE80211_NUM_TIDS) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200681 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
Johannes Berg5a306f52012-11-14 23:22:21 +0100682 tid, IEEE80211_NUM_TIDS);
Johannes Bergb8695a82009-02-10 21:25:46 +0100683 return;
684 }
685
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200686 mutex_lock(&local->sta_mtx);
Felix Fietkaubc192f82011-11-23 21:09:49 +0700687 sta = sta_info_get_bss(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100688 if (!sta) {
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200689 mutex_unlock(&local->sta_mtx);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200690 ht_dbg(sdata, "Could not find station: %pM\n", ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100691 return;
692 }
693
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200694 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg40b275b2011-05-13 14:15:49 +0200695 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100696
Johannes Berga622ab72010-06-10 10:21:39 +0200697 if (WARN_ON(!tid_tx)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200698 ht_dbg(sdata, "addBA was not requested!\n");
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200699 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100700 }
701
Johannes Berga622ab72010-06-10 10:21:39 +0200702 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200703 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100704
Johannes Berga622ab72010-06-10 10:21:39 +0200705 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +0100706 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100707
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200708 unlock:
709 mutex_unlock(&sta->ampdu_mlme.mtx);
710 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100711}
Johannes Bergb8695a82009-02-10 21:25:46 +0100712
Johannes Bergc951ad32009-11-16 12:00:38 +0100713void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Berg86ab6c52009-02-10 21:25:49 +0100714 const u8 *ra, u16 tid)
715{
Johannes Bergc951ad32009-11-16 12:00:38 +0100716 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
717 struct ieee80211_local *local = sdata->local;
Johannes Berg86ab6c52009-02-10 21:25:49 +0100718 struct ieee80211_ra_tid *ra_tid;
719 struct sk_buff *skb = dev_alloc_skb(0);
720
Joe Perchesd15b8452011-08-29 14:17:31 -0700721 if (unlikely(!skb))
Johannes Berg86ab6c52009-02-10 21:25:49 +0100722 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700723
Johannes Berg86ab6c52009-02-10 21:25:49 +0100724 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
725 memcpy(&ra_tid->ra, ra, ETH_ALEN);
726 ra_tid->tid = tid;
727
Johannes Bergc1475ca2010-06-10 10:21:37 +0200728 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
729 skb_queue_tail(&sdata->skb_queue, skb);
730 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg86ab6c52009-02-10 21:25:49 +0100731}
732EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
733
Johannes Berg849b7962009-02-10 21:25:54 +0100734int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
Johannes Bergc82c4a82012-07-18 13:31:31 +0200735 enum ieee80211_agg_stop_reason reason)
Johannes Berg849b7962009-02-10 21:25:54 +0100736{
Johannes Berg849b7962009-02-10 21:25:54 +0100737 int ret;
738
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200739 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg849b7962009-02-10 21:25:54 +0100740
Johannes Bergc82c4a82012-07-18 13:31:31 +0200741 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
Johannes Berg849b7962009-02-10 21:25:54 +0100742
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200743 mutex_unlock(&sta->ampdu_mlme.mtx);
744
Johannes Berg849b7962009-02-10 21:25:54 +0100745 return ret;
746}
Johannes Bergb8695a82009-02-10 21:25:46 +0100747
Johannes Berg6a8579d2010-05-27 14:41:07 +0200748int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100749{
Johannes Bergc951ad32009-11-16 12:00:38 +0100750 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
751 struct ieee80211_sub_if_data *sdata = sta->sdata;
752 struct ieee80211_local *local = sdata->local;
Johannes Berg0ab33702010-06-10 10:21:42 +0200753 struct tid_ampdu_tx *tid_tx;
754 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100755
Johannes Berg6a8579d2010-05-27 14:41:07 +0200756 trace_api_stop_tx_ba_session(pubsta, tid);
Johannes Bergb5878a22010-04-07 16:48:40 +0200757
Johannes Berg42531192009-11-20 09:15:51 +0100758 if (!local->ops->ampdu_action)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100759 return -EINVAL;
760
Johannes Berg5a306f52012-11-14 23:22:21 +0100761 if (tid >= IEEE80211_NUM_TIDS)
Johannes Bergb8695a82009-02-10 21:25:46 +0100762 return -EINVAL;
763
Johannes Berg0ab33702010-06-10 10:21:42 +0200764 spin_lock_bh(&sta->lock);
Johannes Berg40b275b2011-05-13 14:15:49 +0200765 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berg0ab33702010-06-10 10:21:42 +0200766
767 if (!tid_tx) {
768 ret = -ENOENT;
769 goto unlock;
770 }
771
Liad Kaufmanb6da9112014-11-19 13:47:38 +0200772 WARN(sta->reserved_tid == tid,
773 "Requested to stop BA session on reserved tid=%d", tid);
774
Johannes Berg0ab33702010-06-10 10:21:42 +0200775 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
776 /* already in progress stopping it */
777 ret = 0;
778 goto unlock;
779 }
780
781 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
782 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
783
784 unlock:
785 spin_unlock_bh(&sta->lock);
786 return ret;
Johannes Bergb8695a82009-02-10 21:25:46 +0100787}
788EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
789
Johannes Bergc951ad32009-11-16 12:00:38 +0100790void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100791{
Johannes Bergc951ad32009-11-16 12:00:38 +0100792 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
793 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100794 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200795 struct tid_ampdu_tx *tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100796
Johannes Bergb5878a22010-04-07 16:48:40 +0200797 trace_api_stop_tx_ba_cb(sdata, ra, tid);
798
Johannes Berg5a306f52012-11-14 23:22:21 +0100799 if (tid >= IEEE80211_NUM_TIDS) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200800 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
Johannes Berg5a306f52012-11-14 23:22:21 +0100801 tid, IEEE80211_NUM_TIDS);
Johannes Bergb8695a82009-02-10 21:25:46 +0100802 return;
803 }
804
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200805 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100806
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200807 mutex_lock(&local->sta_mtx);
808
Felix Fietkaubc192f82011-11-23 21:09:49 +0700809 sta = sta_info_get_bss(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100810 if (!sta) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200811 ht_dbg(sdata, "Could not find station: %pM\n", ra);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200812 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100813 }
Johannes Bergb8695a82009-02-10 21:25:46 +0100814
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200815 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200816 spin_lock_bh(&sta->lock);
Johannes Berg40b275b2011-05-13 14:15:49 +0200817 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200818
819 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
Johannes Berg0a214d32013-01-16 10:39:44 +0100820 ht_dbg(sdata,
821 "unexpected callback to A-MPDU stop for %pM tid %d\n",
822 sta->sta.addr, tid);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200823 goto unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100824 }
825
Johannes Berg53f73c02010-10-05 19:37:40 +0200826 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
Johannes Bergb8695a82009-02-10 21:25:46 +0100827 ieee80211_send_delba(sta->sdata, ra, tid,
828 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
829
Johannes Bergfaec12e2012-07-18 14:12:44 +0200830 ieee80211_remove_tid_tx(sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100831
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200832 unlock_sta:
Johannes Berga622ab72010-06-10 10:21:39 +0200833 spin_unlock_bh(&sta->lock);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200834 mutex_unlock(&sta->ampdu_mlme.mtx);
835 unlock:
836 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100837}
Johannes Bergb8695a82009-02-10 21:25:46 +0100838
Johannes Bergc951ad32009-11-16 12:00:38 +0100839void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Bergb8695a82009-02-10 21:25:46 +0100840 const u8 *ra, u16 tid)
841{
Johannes Bergc951ad32009-11-16 12:00:38 +0100842 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
843 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100844 struct ieee80211_ra_tid *ra_tid;
845 struct sk_buff *skb = dev_alloc_skb(0);
846
Joe Perchesd15b8452011-08-29 14:17:31 -0700847 if (unlikely(!skb))
Johannes Bergb8695a82009-02-10 21:25:46 +0100848 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700849
Johannes Bergb8695a82009-02-10 21:25:46 +0100850 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
851 memcpy(&ra_tid->ra, ra, ETH_ALEN);
852 ra_tid->tid = tid;
853
Johannes Bergc1475ca2010-06-10 10:21:37 +0200854 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
855 skb_queue_tail(&sdata->skb_queue, skb);
856 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergb8695a82009-02-10 21:25:46 +0100857}
858EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
859
Johannes Berg86ab6c52009-02-10 21:25:49 +0100860
Johannes Bergb8695a82009-02-10 21:25:46 +0100861void ieee80211_process_addba_resp(struct ieee80211_local *local,
862 struct sta_info *sta,
863 struct ieee80211_mgmt *mgmt,
864 size_t len)
865{
Johannes Berga622ab72010-06-10 10:21:39 +0200866 struct tid_ampdu_tx *tid_tx;
Johannes Bergb1720232009-03-23 17:28:39 +0100867 u16 capab, tid;
Johannes Berg0b01f032011-01-18 13:51:05 +0100868 u8 buf_size;
Johannes Bergb8695a82009-02-10 21:25:46 +0100869
870 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
871 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
Johannes Berg0b01f032011-01-18 13:51:05 +0100872 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
Johannes Bergb8695a82009-02-10 21:25:46 +0100873
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200874 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100875
Johannes Berg40b275b2011-05-13 14:15:49 +0200876 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200877 if (!tid_tx)
Johannes Berg8ade0082009-11-18 17:15:06 +0100878 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100879
Johannes Berga622ab72010-06-10 10:21:39 +0200880 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
Johannes Berg0a214d32013-01-16 10:39:44 +0100881 ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
882 sta->sta.addr, tid);
Johannes Berg8ade0082009-11-18 17:15:06 +0100883 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100884 }
885
Nikolay Martynovd305a652011-11-28 09:18:00 +0100886 del_timer_sync(&tid_tx->addba_resp_timer);
Johannes Berg8ade0082009-11-18 17:15:06 +0100887
Johannes Berg0a214d32013-01-16 10:39:44 +0100888 ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
889 sta->sta.addr, tid);
Nikolay Martynovd305a652011-11-28 09:18:00 +0100890
891 /*
892 * addba_resp_timer may have fired before we got here, and
893 * caused WANT_STOP to be set. If the stop then was already
894 * processed further, STOPPING might be set.
895 */
896 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
897 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200898 ht_dbg(sta->sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +0100899 "got addBA resp for %pM tid %d but we already gave up\n",
900 sta->sta.addr, tid);
Nikolay Martynovd305a652011-11-28 09:18:00 +0100901 goto out;
902 }
903
Helmut Schaa3ca97882011-07-26 12:18:27 +0200904 /*
905 * IEEE 802.11-2007 7.3.1.14:
906 * In an ADDBA Response frame, when the Status Code field
907 * is set to 0, the Buffer Size subfield is set to a value
908 * of at least 1.
909 */
Johannes Bergb8695a82009-02-10 21:25:46 +0100910 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
Helmut Schaa3ca97882011-07-26 12:18:27 +0200911 == WLAN_STATUS_SUCCESS && buf_size) {
Johannes Berga622ab72010-06-10 10:21:39 +0200912 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
913 &tid_tx->state)) {
914 /* ignore duplicate response */
915 goto out;
916 }
Johannes Bergb8695a82009-02-10 21:25:46 +0100917
Johannes Berg0b01f032011-01-18 13:51:05 +0100918 tid_tx->buf_size = buf_size;
919
Johannes Berga622ab72010-06-10 10:21:39 +0200920 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +0100921 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100922
Johannes Bergb1720232009-03-23 17:28:39 +0100923 sta->ampdu_mlme.addba_req_num[tid] = 0;
Nikolay Martynov285fa692011-11-22 21:50:28 -0500924
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100925 if (tid_tx->timeout) {
Nikolay Martynov285fa692011-11-22 21:50:28 -0500926 mod_timer(&tid_tx->session_timer,
927 TU_TO_EXP_TIME(tid_tx->timeout));
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100928 tid_tx->last_tx = jiffies;
929 }
Nikolay Martynov285fa692011-11-22 21:50:28 -0500930
Johannes Bergb8695a82009-02-10 21:25:46 +0100931 } else {
Johannes Bergc82c4a82012-07-18 13:31:31 +0200932 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
Johannes Bergb8695a82009-02-10 21:25:46 +0100933 }
Johannes Berg2171abc2009-10-29 08:34:00 +0100934
Johannes Berg2171abc2009-10-29 08:34:00 +0100935 out:
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200936 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100937}