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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>
Johannes Bergb8695a82009-02-10 21:25:46 +010018#include <net/mac80211.h>
19#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020020#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010021#include "wme.h"
22
Johannes Berg86ab6c52009-02-10 21:25:49 +010023/**
Johannes Berg73a72a82010-06-10 10:21:50 +020024 * DOC: TX A-MPDU aggregation
Johannes Berg86ab6c52009-02-10 21:25:49 +010025 *
26 * Aggregation on the TX side requires setting the hardware flag
Johannes Berg73a72a82010-06-10 10:21:50 +020027 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
28 * packets with a flag indicating A-MPDU aggregation. The driver
29 * or device is responsible for actually aggregating the frames,
30 * as well as deciding how many and which to aggregate.
Johannes Berg86ab6c52009-02-10 21:25:49 +010031 *
Johannes Berg73a72a82010-06-10 10:21:50 +020032 * When TX aggregation is started by some subsystem (usually the rate
33 * control algorithm would be appropriate) by calling the
34 * ieee80211_start_tx_ba_session() function, the driver will be
35 * notified via its @ampdu_action function, with the
36 * %IEEE80211_AMPDU_TX_START action.
Johannes Berg86ab6c52009-02-10 21:25:49 +010037 *
38 * In response to that, the driver is later required to call the
Johannes Berg73a72a82010-06-10 10:21:50 +020039 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
40 * start the aggregation session after the peer has also responded.
41 * If the peer responds negatively, the session will be stopped
42 * again right away. Note that it is possible for the aggregation
43 * session to be stopped before the driver has indicated that it
44 * is done setting it up, in which case it must not indicate the
45 * setup completion.
Johannes Berg86ab6c52009-02-10 21:25:49 +010046 *
Johannes Berg73a72a82010-06-10 10:21:50 +020047 * Also note that, since we also need to wait for a response from
48 * the peer, the driver is notified of the completion of the
49 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
50 * @ampdu_action callback.
51 *
52 * Similarly, when the aggregation session is stopped by the peer
53 * or something calling ieee80211_stop_tx_ba_session(), the driver's
54 * @ampdu_action function will be called with the action
55 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
56 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
Johannes Berg86ab6c52009-02-10 21:25:49 +010057 */
58
Johannes Bergb8695a82009-02-10 21:25:46 +010059static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
60 const u8 *da, u16 tid,
61 u8 dialog_token, u16 start_seq_num,
62 u16 agg_size, u16 timeout)
63{
64 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +010065 struct sk_buff *skb;
66 struct ieee80211_mgmt *mgmt;
67 u16 capab;
68
69 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
70
71 if (!skb) {
72 printk(KERN_ERR "%s: failed to allocate buffer "
Johannes Berg47846c92009-11-25 17:46:19 +010073 "for addba request frame\n", sdata->name);
Johannes Bergb8695a82009-02-10 21:25:46 +010074 return;
75 }
76 skb_reserve(skb, local->hw.extra_tx_headroom);
77 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
78 memset(mgmt, 0, 24);
79 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +010080 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +010081 if (sdata->vif.type == NL80211_IFTYPE_AP ||
82 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg47846c92009-11-25 17:46:19 +010083 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010084 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
85 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +010086
87 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
88 IEEE80211_STYPE_ACTION);
89
90 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
91
92 mgmt->u.action.category = WLAN_CATEGORY_BACK;
93 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
94
95 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
96 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
97 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
98 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
99
100 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
101
102 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
103 mgmt->u.action.u.addba_req.start_seq_num =
104 cpu_to_le16(start_seq_num << 4);
105
Johannes Berg62ae67b2009-11-18 18:42:05 +0100106 ieee80211_tx_skb(sdata, skb);
Johannes Bergb8695a82009-02-10 21:25:46 +0100107}
108
109void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
110{
111 struct ieee80211_local *local = sdata->local;
112 struct sk_buff *skb;
113 struct ieee80211_bar *bar;
114 u16 bar_control = 0;
115
116 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
117 if (!skb) {
118 printk(KERN_ERR "%s: failed to allocate buffer for "
Johannes Berg47846c92009-11-25 17:46:19 +0100119 "bar frame\n", sdata->name);
Johannes Bergb8695a82009-02-10 21:25:46 +0100120 return;
121 }
122 skb_reserve(skb, local->hw.extra_tx_headroom);
123 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
124 memset(bar, 0, sizeof(*bar));
125 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
126 IEEE80211_STYPE_BACK_REQ);
127 memcpy(bar->ra, ra, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100128 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +0100129 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
130 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
131 bar_control |= (u16)(tid << 12);
132 bar->control = cpu_to_le16(bar_control);
133 bar->start_seq_num = cpu_to_le16(ssn);
134
Johannes Berg62ae67b2009-11-18 18:42:05 +0100135 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
136 ieee80211_tx_skb(sdata, skb);
Johannes Bergb8695a82009-02-10 21:25:46 +0100137}
138
Johannes Berga622ab72010-06-10 10:21:39 +0200139static void kfree_tid_tx(struct rcu_head *rcu_head)
140{
141 struct tid_ampdu_tx *tid_tx =
142 container_of(rcu_head, struct tid_ampdu_tx, rcu_head);
143
144 kfree(tid_tx);
145}
146
Johannes Berg67c282c2010-06-10 10:21:43 +0200147int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
148 enum ieee80211_back_parties initiator)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100149{
Johannes Berg849b7962009-02-10 21:25:54 +0100150 struct ieee80211_local *local = sta->local;
Johannes Berga622ab72010-06-10 10:21:39 +0200151 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100152 int ret;
Johannes Berga622ab72010-06-10 10:21:39 +0200153
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200154 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200155
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200156 if (!tid_tx)
Johannes Berga622ab72010-06-10 10:21:39 +0200157 return -ENOENT;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100158
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200159 spin_lock_bh(&sta->lock);
160
Johannes Berg0ab33702010-06-10 10:21:42 +0200161 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
162 /* not even started yet! */
163 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200164 spin_unlock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200165 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
166 return 0;
167 }
168
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200169 spin_unlock_bh(&sta->lock);
170
Johannes Berg827d42c2009-11-22 12:28:41 +0100171#ifdef CONFIG_MAC80211_HT_DEBUG
172 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
173 sta->sta.addr, tid);
174#endif /* CONFIG_MAC80211_HT_DEBUG */
175
Johannes Berga622ab72010-06-10 10:21:39 +0200176 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100177
Johannes Berga622ab72010-06-10 10:21:39 +0200178 /*
179 * After this packets are no longer handed right through
180 * to the driver but are put onto tid_tx->pending instead,
181 * with locking to ensure proper access.
182 */
183 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
Vasanthakumar Thiagarajan736708b2009-06-09 14:11:46 +0530184
Johannes Berga622ab72010-06-10 10:21:39 +0200185 tid_tx->stop_initiator = initiator;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100186
Johannes Berg12375ef2009-11-25 20:30:31 +0100187 ret = drv_ampdu_action(local, sta->sdata,
Johannes Bergc951ad32009-11-16 12:00:38 +0100188 IEEE80211_AMPDU_TX_STOP,
Johannes Berg24487982009-04-23 18:52:52 +0200189 &sta->sta, tid, NULL);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100190
191 /* HW shall not deny going back to legacy */
192 if (WARN_ON(ret)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100193 /*
194 * We may have pending packets get stuck in this case...
195 * Not bothering with a workaround for now.
196 */
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100197 }
198
199 return ret;
200}
201
Johannes Bergb8695a82009-02-10 21:25:46 +0100202/*
203 * After sending add Block Ack request we activated a timer until
204 * add Block Ack response will arrive from the recipient.
205 * If this timer expires sta_addba_resp_timer_expired will be executed.
206 */
207static void sta_addba_resp_timer_expired(unsigned long data)
208{
209 /* not an elegant detour, but there is no choice as the timer passes
210 * only one argument, and both sta_info and TID are needed, so init
211 * flow in sta_info_create gives the TID as data, while the timer_to_id
212 * array gives the sta through container_of */
213 u16 tid = *(u8 *)data;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100214 struct sta_info *sta = container_of((void *)data,
Johannes Bergb8695a82009-02-10 21:25:46 +0100215 struct sta_info, timer_to_tid[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200216 struct tid_ampdu_tx *tid_tx;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100217
Johannes Bergb8695a82009-02-10 21:25:46 +0100218 /* check if the TID waits for addBA response */
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200219 rcu_read_lock();
220 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
Johannes Berga622ab72010-06-10 10:21:39 +0200221 if (!tid_tx ||
222 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200223 rcu_read_unlock();
Johannes Bergb8695a82009-02-10 21:25:46 +0100224#ifdef CONFIG_MAC80211_HT_DEBUG
225 printk(KERN_DEBUG "timer expired on tid %d but we are not "
Johannes Berg67e0f392010-04-19 11:03:13 +0200226 "(or no longer) expecting addBA response there\n",
Johannes Berg8ade0082009-11-18 17:15:06 +0100227 tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100228#endif
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100229 return;
Johannes Bergb8695a82009-02-10 21:25:46 +0100230 }
231
232#ifdef CONFIG_MAC80211_HT_DEBUG
233 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
234#endif
235
Johannes Berg83a5cbf2010-06-10 10:21:47 +0200236 ieee80211_stop_tx_ba_session(&sta->sta, tid);
237 rcu_read_unlock();
Johannes Bergb8695a82009-02-10 21:25:46 +0100238}
239
Johannes Berg96f5e662009-02-12 00:51:53 +0100240static inline int ieee80211_ac_from_tid(int tid)
241{
242 return ieee802_1d_to_ac[tid & 7];
243}
244
Johannes Berga6a67db2010-06-10 10:21:41 +0200245/*
246 * When multiple aggregation sessions on multiple stations
247 * are being created/destroyed simultaneously, we need to
248 * refcount the global queue stop caused by that in order
249 * to not get into a situation where one of the aggregation
250 * setup or teardown re-enables queues before the other is
251 * ready to handle that.
252 *
253 * These two functions take care of this issue by keeping
254 * a global "agg_queue_stop" refcount.
255 */
256static void __acquires(agg_queue)
257ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
258{
259 int queue = ieee80211_ac_from_tid(tid);
260
261 if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
262 ieee80211_stop_queue_by_reason(
263 &local->hw, queue,
264 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
265 __acquire(agg_queue);
266}
267
268static void __releases(agg_queue)
269ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
270{
271 int queue = ieee80211_ac_from_tid(tid);
272
273 if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
274 ieee80211_wake_queue_by_reason(
275 &local->hw, queue,
276 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
277 __release(agg_queue);
278}
279
Johannes Berg67c282c2010-06-10 10:21:43 +0200280void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
Johannes Berg0ab33702010-06-10 10:21:42 +0200281{
282 struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
283 struct ieee80211_local *local = sta->local;
284 struct ieee80211_sub_if_data *sdata = sta->sdata;
285 u16 start_seq_num;
286 int ret;
287
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200288 lockdep_assert_held(&sta->ampdu_mlme.mtx);
289
Johannes Berg0ab33702010-06-10 10:21:42 +0200290 /*
291 * While we're asking the driver about the aggregation,
292 * stop the AC queue so that we don't have to worry
293 * about frames that came in while we were doing that,
294 * which would require us to put them to the AC pending
295 * afterwards which just makes the code more complex.
296 */
297 ieee80211_stop_queue_agg(local, tid);
298
299 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
300
301 /*
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200302 * make sure no packets are being processed to get
303 * valid starting sequence number
Johannes Berg0ab33702010-06-10 10:21:42 +0200304 */
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200305 synchronize_net();
306
Johannes Berg0ab33702010-06-10 10:21:42 +0200307 start_seq_num = sta->tid_seq[tid] >> 4;
308
309 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
310 &sta->sta, tid, &start_seq_num);
311 if (ret) {
312#ifdef CONFIG_MAC80211_HT_DEBUG
313 printk(KERN_DEBUG "BA request denied - HW unavailable for"
314 " tid %d\n", tid);
315#endif
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200316 spin_lock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200317 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200318 spin_unlock_bh(&sta->lock);
319
Johannes Berg0ab33702010-06-10 10:21:42 +0200320 ieee80211_wake_queue_agg(local, tid);
321 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
322 return;
323 }
324
325 /* we can take packets again now */
326 ieee80211_wake_queue_agg(local, tid);
327
328 /* activate the timer for the recipient's addBA response */
329 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
330#ifdef CONFIG_MAC80211_HT_DEBUG
331 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
332#endif
333
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200334 spin_lock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200335 sta->ampdu_mlme.addba_req_num[tid]++;
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200336 spin_unlock_bh(&sta->lock);
Johannes Berg0ab33702010-06-10 10:21:42 +0200337
338 /* send AddBA request */
339 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
340 tid_tx->dialog_token, start_seq_num,
341 0x40, 5000);
342}
343
Johannes Bergc951ad32009-11-16 12:00:38 +0100344int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100345{
Johannes Bergc951ad32009-11-16 12:00:38 +0100346 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
347 struct ieee80211_sub_if_data *sdata = sta->sdata;
348 struct ieee80211_local *local = sdata->local;
Johannes Berga622ab72010-06-10 10:21:39 +0200349 struct tid_ampdu_tx *tid_tx;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100350 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100351
Johannes Bergb5878a22010-04-07 16:48:40 +0200352 trace_api_start_tx_ba_session(pubsta, tid);
353
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100354 if (WARN_ON(!local->ops->ampdu_action))
355 return -EINVAL;
356
Johannes Bergc951ad32009-11-16 12:00:38 +0100357 if ((tid >= STA_TID_NUM) ||
358 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
Johannes Bergb8695a82009-02-10 21:25:46 +0100359 return -EINVAL;
360
361#ifdef CONFIG_MAC80211_HT_DEBUG
362 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
Johannes Bergc951ad32009-11-16 12:00:38 +0100363 pubsta->addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100364#endif /* CONFIG_MAC80211_HT_DEBUG */
365
Johannes Berg8abd3f92009-02-10 21:25:47 +0100366 /*
367 * The aggregation code is not prepared to handle
368 * anything but STA/AP due to the BSSID handling.
369 * IBSS could work in the code but isn't supported
370 * by drivers or the standard.
371 */
Johannes Bergc951ad32009-11-16 12:00:38 +0100372 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
373 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
374 sdata->vif.type != NL80211_IFTYPE_AP)
375 return -EINVAL;
Johannes Berg8abd3f92009-02-10 21:25:47 +0100376
Johannes Berg618f3562010-04-06 11:18:46 +0200377 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
Sujith722f0692009-03-17 08:50:06 +0530378#ifdef CONFIG_MAC80211_HT_DEBUG
Johannes Berg2a419052010-06-10 10:21:29 +0200379 printk(KERN_DEBUG "BA sessions blocked. "
Sujith722f0692009-03-17 08:50:06 +0530380 "Denying BA session request\n");
381#endif
Johannes Bergc951ad32009-11-16 12:00:38 +0100382 return -EINVAL;
Sujith722f0692009-03-17 08:50:06 +0530383 }
384
Johannes Bergb8695a82009-02-10 21:25:46 +0100385 spin_lock_bh(&sta->lock);
386
387 /* we have tried too many times, receiver does not want A-MPDU */
388 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
389 ret = -EBUSY;
390 goto err_unlock_sta;
391 }
392
Johannes Berga622ab72010-06-10 10:21:39 +0200393 tid_tx = sta->ampdu_mlme.tid_tx[tid];
Johannes Bergb8695a82009-02-10 21:25:46 +0100394 /* check if the TID is not in aggregation flow already */
Johannes Berga622ab72010-06-10 10:21:39 +0200395 if (tid_tx) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100396#ifdef CONFIG_MAC80211_HT_DEBUG
397 printk(KERN_DEBUG "BA request denied - session is not "
398 "idle on tid %u\n", tid);
399#endif /* CONFIG_MAC80211_HT_DEBUG */
400 ret = -EAGAIN;
401 goto err_unlock_sta;
402 }
403
404 /* prepare A-MPDU MLME for Tx aggregation */
Johannes Berga622ab72010-06-10 10:21:39 +0200405 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
406 if (!tid_tx) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100407#ifdef CONFIG_MAC80211_HT_DEBUG
408 if (net_ratelimit())
409 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
410 tid);
411#endif
412 ret = -ENOMEM;
Johannes Berg0ab33702010-06-10 10:21:42 +0200413 goto err_unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100414 }
Johannes Berg96f5e662009-02-12 00:51:53 +0100415
Johannes Berga622ab72010-06-10 10:21:39 +0200416 skb_queue_head_init(&tid_tx->pending);
Johannes Berg0ab33702010-06-10 10:21:42 +0200417 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100418
Johannes Bergb8695a82009-02-10 21:25:46 +0100419 /* Tx timer */
Johannes Berga622ab72010-06-10 10:21:39 +0200420 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
421 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
422 init_timer(&tid_tx->addba_resp_timer);
Johannes Bergb8695a82009-02-10 21:25:46 +0100423
Johannes Berg0ab33702010-06-10 10:21:42 +0200424 /* assign a dialog token */
Johannes Bergb8695a82009-02-10 21:25:46 +0100425 sta->ampdu_mlme.dialog_token_allocator++;
Johannes Berga622ab72010-06-10 10:21:39 +0200426 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
Johannes Berga622ab72010-06-10 10:21:39 +0200427
Johannes Berg0ab33702010-06-10 10:21:42 +0200428 /* finally, assign it to the array */
429 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100430
Johannes Berg0ab33702010-06-10 10:21:42 +0200431 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
Johannes Berg51a0d382010-05-31 12:00:12 +0200432
Johannes Berg0ab33702010-06-10 10:21:42 +0200433 /* this flow continues off the work */
Johannes Berg96f5e662009-02-12 00:51:53 +0100434 err_unlock_sta:
Johannes Bergb8695a82009-02-10 21:25:46 +0100435 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100436 return ret;
437}
438EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
439
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100440/*
441 * splice packets from the STA's pending to the local pending,
Johannes Berga6a67db2010-06-10 10:21:41 +0200442 * requires a call to ieee80211_agg_splice_finish later
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100443 */
Johannes Berga6a67db2010-06-10 10:21:41 +0200444static void __acquires(agg_queue)
445ieee80211_agg_splice_packets(struct ieee80211_local *local,
446 struct tid_ampdu_tx *tid_tx, u16 tid)
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100447{
Johannes Berga6a67db2010-06-10 10:21:41 +0200448 int queue = ieee80211_ac_from_tid(tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100449 unsigned long flags;
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100450
Johannes Berga6a67db2010-06-10 10:21:41 +0200451 ieee80211_stop_queue_agg(local, tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100452
Johannes Berga622ab72010-06-10 10:21:39 +0200453 if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
454 " from the pending queue\n", tid))
Luis R. Rodriguez416fbdf2009-08-11 13:10:33 -0700455 return;
456
Johannes Berga622ab72010-06-10 10:21:39 +0200457 if (!skb_queue_empty(&tid_tx->pending)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100459 /* copy over remaining packets */
Johannes Berga622ab72010-06-10 10:21:39 +0200460 skb_queue_splice_tail_init(&tid_tx->pending,
461 &local->pending[queue]);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100462 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
463 }
464}
465
Johannes Berga6a67db2010-06-10 10:21:41 +0200466static void __releases(agg_queue)
467ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100468{
Johannes Berga6a67db2010-06-10 10:21:41 +0200469 ieee80211_wake_queue_agg(local, tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100470}
471
Johannes Bergb1720232009-03-23 17:28:39 +0100472static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
473 struct sta_info *sta, u16 tid)
474{
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200475 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200476
Johannes Bergb1720232009-03-23 17:28:39 +0100477#ifdef CONFIG_MAC80211_HT_DEBUG
Frans Pop55f98932010-03-24 19:46:29 +0100478 printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100479#endif
480
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200481 drv_ampdu_action(local, sta->sdata,
482 IEEE80211_AMPDU_TX_OPERATIONAL,
483 &sta->sta, tid, NULL);
484
485 /*
486 * synchronize with TX path, while splicing the TX path
487 * should block so it won't put more packets onto pending.
488 */
489 spin_lock_bh(&sta->lock);
490
Johannes Berga622ab72010-06-10 10:21:39 +0200491 ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100492 /*
Johannes Berga622ab72010-06-10 10:21:39 +0200493 * Now mark as operational. This will be visible
494 * in the TX path, and lets it go lock-free in
495 * the common case.
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100496 */
Johannes Berga622ab72010-06-10 10:21:39 +0200497 set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
498 ieee80211_agg_splice_finish(local, tid);
Johannes Bergb1720232009-03-23 17:28:39 +0100499
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200500 spin_unlock_bh(&sta->lock);
Johannes Bergb1720232009-03-23 17:28:39 +0100501}
502
Johannes Bergc951ad32009-11-16 12:00:38 +0100503void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100504{
Johannes Bergc951ad32009-11-16 12:00:38 +0100505 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
506 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100507 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200508 struct tid_ampdu_tx *tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100509
Johannes Bergb5878a22010-04-07 16:48:40 +0200510 trace_api_start_tx_ba_cb(sdata, ra, tid);
511
Johannes Bergb8695a82009-02-10 21:25:46 +0100512 if (tid >= STA_TID_NUM) {
513#ifdef CONFIG_MAC80211_HT_DEBUG
514 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
515 tid, STA_TID_NUM);
516#endif
517 return;
518 }
519
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200520 mutex_lock(&local->sta_mtx);
Johannes Bergabe60632009-11-25 17:46:18 +0100521 sta = sta_info_get(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100522 if (!sta) {
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200523 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100524#ifdef CONFIG_MAC80211_HT_DEBUG
525 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
526#endif
527 return;
528 }
529
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200530 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200531 tid_tx = sta->ampdu_mlme.tid_tx[tid];
Johannes Bergb8695a82009-02-10 21:25:46 +0100532
Johannes Berga622ab72010-06-10 10:21:39 +0200533 if (WARN_ON(!tid_tx)) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100534#ifdef CONFIG_MAC80211_HT_DEBUG
Johannes Berga622ab72010-06-10 10:21:39 +0200535 printk(KERN_DEBUG "addBA was not requested!\n");
Johannes Bergb8695a82009-02-10 21:25:46 +0100536#endif
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200537 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100538 }
539
Johannes Berga622ab72010-06-10 10:21:39 +0200540 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200541 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100542
Johannes Berga622ab72010-06-10 10:21:39 +0200543 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +0100544 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100545
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200546 unlock:
547 mutex_unlock(&sta->ampdu_mlme.mtx);
548 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100549}
Johannes Bergb8695a82009-02-10 21:25:46 +0100550
Johannes Bergc951ad32009-11-16 12:00:38 +0100551void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Berg86ab6c52009-02-10 21:25:49 +0100552 const u8 *ra, u16 tid)
553{
Johannes Bergc951ad32009-11-16 12:00:38 +0100554 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
555 struct ieee80211_local *local = sdata->local;
Johannes Berg86ab6c52009-02-10 21:25:49 +0100556 struct ieee80211_ra_tid *ra_tid;
557 struct sk_buff *skb = dev_alloc_skb(0);
558
559 if (unlikely(!skb)) {
560#ifdef CONFIG_MAC80211_HT_DEBUG
561 if (net_ratelimit())
562 printk(KERN_WARNING "%s: Not enough memory, "
Johannes Berg47846c92009-11-25 17:46:19 +0100563 "dropping start BA session", sdata->name);
Johannes Berg86ab6c52009-02-10 21:25:49 +0100564#endif
565 return;
566 }
567 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
568 memcpy(&ra_tid->ra, ra, ETH_ALEN);
569 ra_tid->tid = tid;
570
Johannes Bergc1475ca2010-06-10 10:21:37 +0200571 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
572 skb_queue_tail(&sdata->skb_queue, skb);
573 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg86ab6c52009-02-10 21:25:49 +0100574}
575EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
576
Johannes Berg849b7962009-02-10 21:25:54 +0100577int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
578 enum ieee80211_back_parties initiator)
579{
Johannes Berg849b7962009-02-10 21:25:54 +0100580 int ret;
581
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200582 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg849b7962009-02-10 21:25:54 +0100583
Johannes Berg849b7962009-02-10 21:25:54 +0100584 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
585
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200586 mutex_unlock(&sta->ampdu_mlme.mtx);
587
Johannes Berg849b7962009-02-10 21:25:54 +0100588 return ret;
589}
Johannes Bergb8695a82009-02-10 21:25:46 +0100590
Johannes Berg6a8579d2010-05-27 14:41:07 +0200591int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100592{
Johannes Bergc951ad32009-11-16 12:00:38 +0100593 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
594 struct ieee80211_sub_if_data *sdata = sta->sdata;
595 struct ieee80211_local *local = sdata->local;
Johannes Berg0ab33702010-06-10 10:21:42 +0200596 struct tid_ampdu_tx *tid_tx;
597 int ret = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100598
Johannes Berg6a8579d2010-05-27 14:41:07 +0200599 trace_api_stop_tx_ba_session(pubsta, tid);
Johannes Bergb5878a22010-04-07 16:48:40 +0200600
Johannes Berg42531192009-11-20 09:15:51 +0100601 if (!local->ops->ampdu_action)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100602 return -EINVAL;
603
Johannes Bergb8695a82009-02-10 21:25:46 +0100604 if (tid >= STA_TID_NUM)
605 return -EINVAL;
606
Johannes Berg0ab33702010-06-10 10:21:42 +0200607 spin_lock_bh(&sta->lock);
608 tid_tx = sta->ampdu_mlme.tid_tx[tid];
609
610 if (!tid_tx) {
611 ret = -ENOENT;
612 goto unlock;
613 }
614
615 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
616 /* already in progress stopping it */
617 ret = 0;
618 goto unlock;
619 }
620
621 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
622 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
623
624 unlock:
625 spin_unlock_bh(&sta->lock);
626 return ret;
Johannes Bergb8695a82009-02-10 21:25:46 +0100627}
628EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
629
Johannes Bergc951ad32009-11-16 12:00:38 +0100630void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
Johannes Bergb8695a82009-02-10 21:25:46 +0100631{
Johannes Bergc951ad32009-11-16 12:00:38 +0100632 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
633 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100634 struct sta_info *sta;
Johannes Berga622ab72010-06-10 10:21:39 +0200635 struct tid_ampdu_tx *tid_tx;
Johannes Bergb8695a82009-02-10 21:25:46 +0100636
Johannes Bergb5878a22010-04-07 16:48:40 +0200637 trace_api_stop_tx_ba_cb(sdata, ra, tid);
638
Johannes Bergb8695a82009-02-10 21:25:46 +0100639 if (tid >= STA_TID_NUM) {
640#ifdef CONFIG_MAC80211_HT_DEBUG
641 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
642 tid, STA_TID_NUM);
643#endif
644 return;
645 }
646
647#ifdef CONFIG_MAC80211_HT_DEBUG
648 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
649 ra, tid);
650#endif /* CONFIG_MAC80211_HT_DEBUG */
651
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200652 mutex_lock(&local->sta_mtx);
653
Johannes Bergabe60632009-11-25 17:46:18 +0100654 sta = sta_info_get(sdata, ra);
Johannes Bergb8695a82009-02-10 21:25:46 +0100655 if (!sta) {
656#ifdef CONFIG_MAC80211_HT_DEBUG
657 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
658#endif
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200659 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100660 }
Johannes Bergb8695a82009-02-10 21:25:46 +0100661
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200662 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berga622ab72010-06-10 10:21:39 +0200663 spin_lock_bh(&sta->lock);
664 tid_tx = sta->ampdu_mlme.tid_tx[tid];
665
666 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100667#ifdef CONFIG_MAC80211_HT_DEBUG
668 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
669#endif
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200670 goto unlock_sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100671 }
672
Johannes Berga622ab72010-06-10 10:21:39 +0200673 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
Johannes Bergb8695a82009-02-10 21:25:46 +0100674 ieee80211_send_delba(sta->sdata, ra, tid,
675 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
676
Johannes Berga622ab72010-06-10 10:21:39 +0200677 /*
678 * When we get here, the TX path will not be lockless any more wrt.
679 * aggregation, since the OPERATIONAL bit has long been cleared.
680 * Thus it will block on getting the lock, if it occurs. So if we
681 * stop the queue now, we will not get any more packets, and any
682 * that might be being processed will wait for us here, thereby
683 * guaranteeing that no packets go to the tid_tx pending queue any
684 * more.
685 */
686
Johannes Berga622ab72010-06-10 10:21:39 +0200687 ieee80211_agg_splice_packets(local, tid_tx, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100688
Johannes Berga622ab72010-06-10 10:21:39 +0200689 /* future packets must not find the tid_tx struct any more */
690 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
Johannes Berg96f5e662009-02-12 00:51:53 +0100691
Johannes Berga622ab72010-06-10 10:21:39 +0200692 ieee80211_agg_splice_finish(local, tid);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100693
Johannes Berga622ab72010-06-10 10:21:39 +0200694 call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100695
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200696 unlock_sta:
Johannes Berga622ab72010-06-10 10:21:39 +0200697 spin_unlock_bh(&sta->lock);
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200698 mutex_unlock(&sta->ampdu_mlme.mtx);
699 unlock:
700 mutex_unlock(&local->sta_mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100701}
Johannes Bergb8695a82009-02-10 21:25:46 +0100702
Johannes Bergc951ad32009-11-16 12:00:38 +0100703void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
Johannes Bergb8695a82009-02-10 21:25:46 +0100704 const u8 *ra, u16 tid)
705{
Johannes Bergc951ad32009-11-16 12:00:38 +0100706 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
707 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100708 struct ieee80211_ra_tid *ra_tid;
709 struct sk_buff *skb = dev_alloc_skb(0);
710
711 if (unlikely(!skb)) {
712#ifdef CONFIG_MAC80211_HT_DEBUG
713 if (net_ratelimit())
714 printk(KERN_WARNING "%s: Not enough memory, "
Johannes Berg47846c92009-11-25 17:46:19 +0100715 "dropping stop BA session", sdata->name);
Johannes Bergb8695a82009-02-10 21:25:46 +0100716#endif
717 return;
718 }
719 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
720 memcpy(&ra_tid->ra, ra, ETH_ALEN);
721 ra_tid->tid = tid;
722
Johannes Bergc1475ca2010-06-10 10:21:37 +0200723 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
724 skb_queue_tail(&sdata->skb_queue, skb);
725 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergb8695a82009-02-10 21:25:46 +0100726}
727EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
728
Johannes Berg86ab6c52009-02-10 21:25:49 +0100729
Johannes Bergb8695a82009-02-10 21:25:46 +0100730void ieee80211_process_addba_resp(struct ieee80211_local *local,
731 struct sta_info *sta,
732 struct ieee80211_mgmt *mgmt,
733 size_t len)
734{
Johannes Berga622ab72010-06-10 10:21:39 +0200735 struct tid_ampdu_tx *tid_tx;
Johannes Bergb1720232009-03-23 17:28:39 +0100736 u16 capab, tid;
Johannes Bergb8695a82009-02-10 21:25:46 +0100737
738 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
739 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
740
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200741 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100742
Johannes Berga622ab72010-06-10 10:21:39 +0200743 tid_tx = sta->ampdu_mlme.tid_tx[tid];
Johannes Berga622ab72010-06-10 10:21:39 +0200744 if (!tid_tx)
Johannes Berg8ade0082009-11-18 17:15:06 +0100745 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100746
Johannes Berga622ab72010-06-10 10:21:39 +0200747 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100748#ifdef CONFIG_MAC80211_HT_DEBUG
749 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200750#endif
Johannes Berg8ade0082009-11-18 17:15:06 +0100751 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100752 }
753
Johannes Berga622ab72010-06-10 10:21:39 +0200754 del_timer(&tid_tx->addba_resp_timer);
Johannes Berg8ade0082009-11-18 17:15:06 +0100755
Johannes Bergb8695a82009-02-10 21:25:46 +0100756#ifdef CONFIG_MAC80211_HT_DEBUG
Frans Pop55f98932010-03-24 19:46:29 +0100757 printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
Johannes Berga622ab72010-06-10 10:21:39 +0200758#endif
Johannes Berg2171abc2009-10-29 08:34:00 +0100759
Johannes Bergb8695a82009-02-10 21:25:46 +0100760 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
761 == WLAN_STATUS_SUCCESS) {
Johannes Berga622ab72010-06-10 10:21:39 +0200762 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
763 &tid_tx->state)) {
764 /* ignore duplicate response */
765 goto out;
766 }
Johannes Bergb8695a82009-02-10 21:25:46 +0100767
Johannes Berga622ab72010-06-10 10:21:39 +0200768 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
Johannes Bergb1720232009-03-23 17:28:39 +0100769 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100770
Johannes Bergb1720232009-03-23 17:28:39 +0100771 sta->ampdu_mlme.addba_req_num[tid] = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100772 } else {
Johannes Berg849b7962009-02-10 21:25:54 +0100773 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
Johannes Bergb8695a82009-02-10 21:25:46 +0100774 }
Johannes Berg2171abc2009-10-29 08:34:00 +0100775
Johannes Berg2171abc2009-10-29 08:34:00 +0100776 out:
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200777 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100778}