blob: 9e5762ad307d9faa55d4bd11400c5d76e7852dcc [file] [log] [blame]
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>
9 * Copyright 2007-2009, Intel Corporation
10 *
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>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020019#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010020#include "wme.h"
21
Johannes Berg86ab6c52009-02-10 21:25:49 +010022/**
23 * DOC: TX aggregation
24 *
25 * Aggregation on the TX side requires setting the hardware flag
26 * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
27 * hardware parameter to the number of hardware AMPDU queues. If there are no
28 * hardware queues then the driver will (currently) have to do all frame
29 * buffering.
30 *
31 * When TX aggregation is started by some subsystem (usually the rate control
32 * algorithm would be appropriate) by calling the
33 * ieee80211_start_tx_ba_session() function, the driver will be notified via
34 * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
35 *
36 * In response to that, the driver is later required to call the
37 * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
38 * function, which will start the aggregation session.
39 *
40 * Similarly, when the aggregation session is stopped by
41 * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
42 * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
43 * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
44 * (or ieee80211_stop_tx_ba_cb_irqsafe()).
45 */
46
Johannes Bergb8695a82009-02-10 21:25:46 +010047static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
48 const u8 *da, u16 tid,
49 u8 dialog_token, u16 start_seq_num,
50 u16 agg_size, u16 timeout)
51{
52 struct ieee80211_local *local = sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +010053 struct sk_buff *skb;
54 struct ieee80211_mgmt *mgmt;
55 u16 capab;
56
57 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
58
59 if (!skb) {
60 printk(KERN_ERR "%s: failed to allocate buffer "
61 "for addba request frame\n", sdata->dev->name);
62 return;
63 }
64 skb_reserve(skb, local->hw.extra_tx_headroom);
65 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
66 memset(mgmt, 0, 24);
67 memcpy(mgmt->da, da, ETH_ALEN);
68 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +010069 if (sdata->vif.type == NL80211_IFTYPE_AP ||
70 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Bergb8695a82009-02-10 21:25:46 +010071 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010072 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
73 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Bergb8695a82009-02-10 21:25:46 +010074
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_ACTION);
77
78 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
79
80 mgmt->u.action.category = WLAN_CATEGORY_BACK;
81 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
82
83 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
84 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
85 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
86 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
87
88 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
89
90 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
91 mgmt->u.action.u.addba_req.start_seq_num =
92 cpu_to_le16(start_seq_num << 4);
93
94 ieee80211_tx_skb(sdata, skb, 1);
95}
96
97void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
98{
99 struct ieee80211_local *local = sdata->local;
100 struct sk_buff *skb;
101 struct ieee80211_bar *bar;
102 u16 bar_control = 0;
103
104 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
105 if (!skb) {
106 printk(KERN_ERR "%s: failed to allocate buffer for "
107 "bar frame\n", sdata->dev->name);
108 return;
109 }
110 skb_reserve(skb, local->hw.extra_tx_headroom);
111 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
112 memset(bar, 0, sizeof(*bar));
113 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
114 IEEE80211_STYPE_BACK_REQ);
115 memcpy(bar->ra, ra, ETH_ALEN);
116 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
117 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
118 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
119 bar_control |= (u16)(tid << 12);
120 bar->control = cpu_to_le16(bar_control);
121 bar->start_seq_num = cpu_to_le16(ssn);
122
123 ieee80211_tx_skb(sdata, skb, 0);
124}
125
Johannes Berg849b7962009-02-10 21:25:54 +0100126static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
127 enum ieee80211_back_parties initiator)
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100128{
Johannes Berg849b7962009-02-10 21:25:54 +0100129 struct ieee80211_local *local = sta->local;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100130 int ret;
131 u8 *state;
132
133 state = &sta->ampdu_mlme.tid_state_tx[tid];
134
Vasanthakumar Thiagarajan736708b2009-06-09 14:11:46 +0530135 if (*state == HT_AGG_STATE_OPERATIONAL)
136 sta->ampdu_mlme.addba_req_num[tid] = 0;
137
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100138 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
139 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
140
Johannes Berg24487982009-04-23 18:52:52 +0200141 ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_STOP,
142 &sta->sta, tid, NULL);
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100143
144 /* HW shall not deny going back to legacy */
145 if (WARN_ON(ret)) {
146 *state = HT_AGG_STATE_OPERATIONAL;
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100147 /*
148 * We may have pending packets get stuck in this case...
149 * Not bothering with a workaround for now.
150 */
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100151 }
152
153 return ret;
154}
155
Johannes Bergb8695a82009-02-10 21:25:46 +0100156/*
157 * After sending add Block Ack request we activated a timer until
158 * add Block Ack response will arrive from the recipient.
159 * If this timer expires sta_addba_resp_timer_expired will be executed.
160 */
161static void sta_addba_resp_timer_expired(unsigned long data)
162{
163 /* not an elegant detour, but there is no choice as the timer passes
164 * only one argument, and both sta_info and TID are needed, so init
165 * flow in sta_info_create gives the TID as data, while the timer_to_id
166 * array gives the sta through container_of */
167 u16 tid = *(u8 *)data;
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100168 struct sta_info *sta = container_of((void *)data,
Johannes Bergb8695a82009-02-10 21:25:46 +0100169 struct sta_info, timer_to_tid[tid]);
Johannes Bergb8695a82009-02-10 21:25:46 +0100170 u8 *state;
171
Johannes Bergb8695a82009-02-10 21:25:46 +0100172 state = &sta->ampdu_mlme.tid_state_tx[tid];
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100173
Johannes Bergb8695a82009-02-10 21:25:46 +0100174 /* check if the TID waits for addBA response */
175 spin_lock_bh(&sta->lock);
176 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
177 spin_unlock_bh(&sta->lock);
178 *state = HT_AGG_STATE_IDLE;
179#ifdef CONFIG_MAC80211_HT_DEBUG
180 printk(KERN_DEBUG "timer expired on tid %d but we are not "
181 "expecting addBA response there", tid);
182#endif
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100183 return;
Johannes Bergb8695a82009-02-10 21:25:46 +0100184 }
185
186#ifdef CONFIG_MAC80211_HT_DEBUG
187 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
188#endif
189
Johannes Berg849b7962009-02-10 21:25:54 +0100190 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
Johannes Bergb8695a82009-02-10 21:25:46 +0100191 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100192}
193
Johannes Berg96f5e662009-02-12 00:51:53 +0100194static inline int ieee80211_ac_from_tid(int tid)
195{
196 return ieee802_1d_to_ac[tid & 7];
197}
198
Johannes Bergb8695a82009-02-10 21:25:46 +0100199int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
200{
201 struct ieee80211_local *local = hw_to_local(hw);
202 struct sta_info *sta;
203 struct ieee80211_sub_if_data *sdata;
Johannes Bergb8695a82009-02-10 21:25:46 +0100204 u8 *state;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100205 int ret = 0;
Johannes Berg96f5e662009-02-12 00:51:53 +0100206 u16 start_seq_num;
Johannes Bergb8695a82009-02-10 21:25:46 +0100207
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100208 if (WARN_ON(!local->ops->ampdu_action))
209 return -EINVAL;
210
Johannes Bergb8695a82009-02-10 21:25:46 +0100211 if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
212 return -EINVAL;
213
214#ifdef CONFIG_MAC80211_HT_DEBUG
215 printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
216 ra, tid);
217#endif /* CONFIG_MAC80211_HT_DEBUG */
218
219 rcu_read_lock();
220
221 sta = sta_info_get(local, ra);
222 if (!sta) {
223#ifdef CONFIG_MAC80211_HT_DEBUG
224 printk(KERN_DEBUG "Could not find the station\n");
225#endif
226 ret = -ENOENT;
Johannes Berg96f5e662009-02-12 00:51:53 +0100227 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100228 }
229
Johannes Berg8abd3f92009-02-10 21:25:47 +0100230 /*
231 * The aggregation code is not prepared to handle
232 * anything but STA/AP due to the BSSID handling.
233 * IBSS could work in the code but isn't supported
234 * by drivers or the standard.
235 */
236 if (sta->sdata->vif.type != NL80211_IFTYPE_STATION &&
237 sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
238 sta->sdata->vif.type != NL80211_IFTYPE_AP) {
239 ret = -EINVAL;
Johannes Berg96f5e662009-02-12 00:51:53 +0100240 goto unlock;
Johannes Berg8abd3f92009-02-10 21:25:47 +0100241 }
242
Sujith722f0692009-03-17 08:50:06 +0530243 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
244#ifdef CONFIG_MAC80211_HT_DEBUG
245 printk(KERN_DEBUG "Suspend in progress. "
246 "Denying BA session request\n");
247#endif
248 ret = -EINVAL;
249 goto unlock;
250 }
251
Johannes Bergb8695a82009-02-10 21:25:46 +0100252 spin_lock_bh(&sta->lock);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100253 spin_lock(&local->ampdu_lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100254
Johannes Berg96f5e662009-02-12 00:51:53 +0100255 sdata = sta->sdata;
256
Johannes Bergb8695a82009-02-10 21:25:46 +0100257 /* we have tried too many times, receiver does not want A-MPDU */
258 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
259 ret = -EBUSY;
260 goto err_unlock_sta;
261 }
262
263 state = &sta->ampdu_mlme.tid_state_tx[tid];
264 /* check if the TID is not in aggregation flow already */
265 if (*state != HT_AGG_STATE_IDLE) {
266#ifdef CONFIG_MAC80211_HT_DEBUG
267 printk(KERN_DEBUG "BA request denied - session is not "
268 "idle on tid %u\n", tid);
269#endif /* CONFIG_MAC80211_HT_DEBUG */
270 ret = -EAGAIN;
271 goto err_unlock_sta;
272 }
273
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100274 /*
275 * While we're asking the driver about the aggregation,
276 * stop the AC queue so that we don't have to worry
277 * about frames that came in while we were doing that,
278 * which would require us to put them to the AC pending
279 * afterwards which just makes the code more complex.
280 */
281 ieee80211_stop_queue_by_reason(
282 &local->hw, ieee80211_ac_from_tid(tid),
283 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
284
Johannes Bergb8695a82009-02-10 21:25:46 +0100285 /* prepare A-MPDU MLME for Tx aggregation */
286 sta->ampdu_mlme.tid_tx[tid] =
287 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
288 if (!sta->ampdu_mlme.tid_tx[tid]) {
289#ifdef CONFIG_MAC80211_HT_DEBUG
290 if (net_ratelimit())
291 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
292 tid);
293#endif
294 ret = -ENOMEM;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100295 goto err_wake_queue;
Johannes Bergb8695a82009-02-10 21:25:46 +0100296 }
Johannes Berg96f5e662009-02-12 00:51:53 +0100297
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100298 skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending);
299
Johannes Bergb8695a82009-02-10 21:25:46 +0100300 /* Tx timer */
301 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
302 sta_addba_resp_timer_expired;
303 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
304 (unsigned long)&sta->timer_to_tid[tid];
305 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
306
Johannes Bergb8695a82009-02-10 21:25:46 +0100307 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
308 * call back right away, it must see that the flow has begun */
309 *state |= HT_ADDBA_REQUESTED_MSK;
310
Johannes Bergb8695a82009-02-10 21:25:46 +0100311 start_seq_num = sta->tid_seq[tid];
312
Johannes Berg24487982009-04-23 18:52:52 +0200313 ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_START,
314 &sta->sta, tid, &start_seq_num);
Johannes Bergb8695a82009-02-10 21:25:46 +0100315
316 if (ret) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100317#ifdef CONFIG_MAC80211_HT_DEBUG
318 printk(KERN_DEBUG "BA request denied - HW unavailable for"
319 " tid %d\n", tid);
320#endif /* CONFIG_MAC80211_HT_DEBUG */
321 *state = HT_AGG_STATE_IDLE;
Johannes Berg96f5e662009-02-12 00:51:53 +0100322 goto err_free;
Johannes Bergb8695a82009-02-10 21:25:46 +0100323 }
324
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100325 /* Driver vetoed or OKed, but we can take packets again now */
326 ieee80211_wake_queue_by_reason(
327 &local->hw, ieee80211_ac_from_tid(tid),
328 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
329
330 spin_unlock(&local->ampdu_lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100331 spin_unlock_bh(&sta->lock);
332
333 /* send an addBA request */
334 sta->ampdu_mlme.dialog_token_allocator++;
335 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
336 sta->ampdu_mlme.dialog_token_allocator;
337 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
338
Johannes Bergb8695a82009-02-10 21:25:46 +0100339 ieee80211_send_addba_request(sta->sdata, ra, tid,
340 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
341 sta->ampdu_mlme.tid_tx[tid]->ssn,
342 0x40, 5000);
Vasanthakumar Thiagarajan736708b2009-06-09 14:11:46 +0530343 sta->ampdu_mlme.addba_req_num[tid]++;
Johannes Bergb8695a82009-02-10 21:25:46 +0100344 /* activate the timer for the recipient's addBA response */
345 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
346 jiffies + ADDBA_RESP_INTERVAL;
347 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
348#ifdef CONFIG_MAC80211_HT_DEBUG
349 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
350#endif
Johannes Berg96f5e662009-02-12 00:51:53 +0100351 goto unlock;
Johannes Bergb8695a82009-02-10 21:25:46 +0100352
Johannes Berg96f5e662009-02-12 00:51:53 +0100353 err_free:
Johannes Bergb8695a82009-02-10 21:25:46 +0100354 kfree(sta->ampdu_mlme.tid_tx[tid]);
355 sta->ampdu_mlme.tid_tx[tid] = NULL;
Johannes Berge4e72fb2009-03-23 17:28:42 +0100356 err_wake_queue:
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100357 ieee80211_wake_queue_by_reason(
358 &local->hw, ieee80211_ac_from_tid(tid),
359 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
Johannes Berg96f5e662009-02-12 00:51:53 +0100360 err_unlock_sta:
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100361 spin_unlock(&local->ampdu_lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100362 spin_unlock_bh(&sta->lock);
Johannes Berg96f5e662009-02-12 00:51:53 +0100363 unlock:
Johannes Bergb8695a82009-02-10 21:25:46 +0100364 rcu_read_unlock();
365 return ret;
366}
367EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
368
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100369/*
370 * splice packets from the STA's pending to the local pending,
371 * requires a call to ieee80211_agg_splice_finish and holding
372 * local->ampdu_lock across both calls.
373 */
374static void ieee80211_agg_splice_packets(struct ieee80211_local *local,
375 struct sta_info *sta, u16 tid)
376{
377 unsigned long flags;
378 u16 queue = ieee80211_ac_from_tid(tid);
379
380 ieee80211_stop_queue_by_reason(
381 &local->hw, queue,
382 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
383
384 if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) {
385 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
386 /* mark queue as pending, it is stopped already */
387 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING,
388 &local->queue_stop_reasons[queue]);
389 /* copy over remaining packets */
390 skb_queue_splice_tail_init(
391 &sta->ampdu_mlme.tid_tx[tid]->pending,
392 &local->pending[queue]);
393 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
394 }
395}
396
397static void ieee80211_agg_splice_finish(struct ieee80211_local *local,
398 struct sta_info *sta, u16 tid)
399{
400 u16 queue = ieee80211_ac_from_tid(tid);
401
402 ieee80211_wake_queue_by_reason(
403 &local->hw, queue,
404 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
405}
406
407/* caller must hold sta->lock */
Johannes Bergb1720232009-03-23 17:28:39 +0100408static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
409 struct sta_info *sta, u16 tid)
410{
411#ifdef CONFIG_MAC80211_HT_DEBUG
412 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
413#endif
414
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100415 spin_lock(&local->ampdu_lock);
416 ieee80211_agg_splice_packets(local, sta, tid);
417 /*
418 * NB: we rely on sta->lock being taken in the TX
419 * processing here when adding to the pending queue,
420 * otherwise we could only change the state of the
421 * session to OPERATIONAL _here_.
422 */
423 ieee80211_agg_splice_finish(local, sta, tid);
424 spin_unlock(&local->ampdu_lock);
Johannes Bergb1720232009-03-23 17:28:39 +0100425
Johannes Berg24487982009-04-23 18:52:52 +0200426 drv_ampdu_action(local, IEEE80211_AMPDU_TX_OPERATIONAL,
427 &sta->sta, tid, NULL);
Johannes Bergb1720232009-03-23 17:28:39 +0100428}
429
Johannes Bergb8695a82009-02-10 21:25:46 +0100430void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
431{
432 struct ieee80211_local *local = hw_to_local(hw);
433 struct sta_info *sta;
434 u8 *state;
435
436 if (tid >= STA_TID_NUM) {
437#ifdef CONFIG_MAC80211_HT_DEBUG
438 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
439 tid, STA_TID_NUM);
440#endif
441 return;
442 }
443
444 rcu_read_lock();
445 sta = sta_info_get(local, ra);
446 if (!sta) {
447 rcu_read_unlock();
448#ifdef CONFIG_MAC80211_HT_DEBUG
449 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
450#endif
451 return;
452 }
453
454 state = &sta->ampdu_mlme.tid_state_tx[tid];
455 spin_lock_bh(&sta->lock);
456
Johannes Berg96f5e662009-02-12 00:51:53 +0100457 if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100458#ifdef CONFIG_MAC80211_HT_DEBUG
459 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
460 *state);
461#endif
462 spin_unlock_bh(&sta->lock);
463 rcu_read_unlock();
464 return;
465 }
466
Johannes Berg96f5e662009-02-12 00:51:53 +0100467 if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK))
468 goto out;
Johannes Bergb8695a82009-02-10 21:25:46 +0100469
470 *state |= HT_ADDBA_DRV_READY_MSK;
471
Johannes Bergb1720232009-03-23 17:28:39 +0100472 if (*state == HT_AGG_STATE_OPERATIONAL)
473 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100474
475 out:
Johannes Bergb8695a82009-02-10 21:25:46 +0100476 spin_unlock_bh(&sta->lock);
477 rcu_read_unlock();
478}
479EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
480
Johannes Berg86ab6c52009-02-10 21:25:49 +0100481void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
482 const u8 *ra, u16 tid)
483{
484 struct ieee80211_local *local = hw_to_local(hw);
485 struct ieee80211_ra_tid *ra_tid;
486 struct sk_buff *skb = dev_alloc_skb(0);
487
488 if (unlikely(!skb)) {
489#ifdef CONFIG_MAC80211_HT_DEBUG
490 if (net_ratelimit())
491 printk(KERN_WARNING "%s: Not enough memory, "
492 "dropping start BA session", skb->dev->name);
493#endif
494 return;
495 }
496 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
497 memcpy(&ra_tid->ra, ra, ETH_ALEN);
498 ra_tid->tid = tid;
499
500 skb->pkt_type = IEEE80211_ADDBA_MSG;
501 skb_queue_tail(&local->skb_queue, skb);
502 tasklet_schedule(&local->tasklet);
503}
504EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
505
Johannes Berg849b7962009-02-10 21:25:54 +0100506int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
507 enum ieee80211_back_parties initiator)
508{
509 u8 *state;
510 int ret;
511
512 /* check if the TID is in aggregation */
513 state = &sta->ampdu_mlme.tid_state_tx[tid];
514 spin_lock_bh(&sta->lock);
515
516 if (*state != HT_AGG_STATE_OPERATIONAL) {
517 ret = -ENOENT;
518 goto unlock;
519 }
520
521#ifdef CONFIG_MAC80211_HT_DEBUG
522 printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
523 sta->sta.addr, tid);
524#endif /* CONFIG_MAC80211_HT_DEBUG */
525
526 ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
527
528 unlock:
529 spin_unlock_bh(&sta->lock);
530 return ret;
531}
Johannes Bergb8695a82009-02-10 21:25:46 +0100532
533int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
534 u8 *ra, u16 tid,
535 enum ieee80211_back_parties initiator)
536{
537 struct ieee80211_local *local = hw_to_local(hw);
538 struct sta_info *sta;
Johannes Bergb8695a82009-02-10 21:25:46 +0100539 int ret = 0;
540
Johannes Berg23e6a7e2009-02-10 21:25:50 +0100541 if (WARN_ON(!local->ops->ampdu_action))
542 return -EINVAL;
543
Johannes Bergb8695a82009-02-10 21:25:46 +0100544 if (tid >= STA_TID_NUM)
545 return -EINVAL;
546
547 rcu_read_lock();
548 sta = sta_info_get(local, ra);
549 if (!sta) {
550 rcu_read_unlock();
551 return -ENOENT;
552 }
553
Johannes Berg849b7962009-02-10 21:25:54 +0100554 ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator);
Johannes Bergb8695a82009-02-10 21:25:46 +0100555 rcu_read_unlock();
556 return ret;
557}
558EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
559
560void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
561{
562 struct ieee80211_local *local = hw_to_local(hw);
563 struct sta_info *sta;
564 u8 *state;
Johannes Bergb8695a82009-02-10 21:25:46 +0100565
566 if (tid >= STA_TID_NUM) {
567#ifdef CONFIG_MAC80211_HT_DEBUG
568 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
569 tid, STA_TID_NUM);
570#endif
571 return;
572 }
573
574#ifdef CONFIG_MAC80211_HT_DEBUG
575 printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
576 ra, tid);
577#endif /* CONFIG_MAC80211_HT_DEBUG */
578
579 rcu_read_lock();
580 sta = sta_info_get(local, ra);
581 if (!sta) {
582#ifdef CONFIG_MAC80211_HT_DEBUG
583 printk(KERN_DEBUG "Could not find station: %pM\n", ra);
584#endif
585 rcu_read_unlock();
586 return;
587 }
588 state = &sta->ampdu_mlme.tid_state_tx[tid];
589
590 /* NOTE: no need to use sta->lock in this state check, as
591 * ieee80211_stop_tx_ba_session will let only one stop call to
592 * pass through per sta/tid
593 */
594 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
595#ifdef CONFIG_MAC80211_HT_DEBUG
596 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
597#endif
598 rcu_read_unlock();
599 return;
600 }
601
602 if (*state & HT_AGG_STATE_INITIATOR_MSK)
603 ieee80211_send_delba(sta->sdata, ra, tid,
604 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
605
Johannes Bergb8695a82009-02-10 21:25:46 +0100606 spin_lock_bh(&sta->lock);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100607 spin_lock(&local->ampdu_lock);
Johannes Berg96f5e662009-02-12 00:51:53 +0100608
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100609 ieee80211_agg_splice_packets(local, sta, tid);
Johannes Berg96f5e662009-02-12 00:51:53 +0100610
Johannes Bergb8695a82009-02-10 21:25:46 +0100611 *state = HT_AGG_STATE_IDLE;
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100612 /* from now on packets are no longer put onto sta->pending */
Johannes Bergb8695a82009-02-10 21:25:46 +0100613 kfree(sta->ampdu_mlme.tid_tx[tid]);
614 sta->ampdu_mlme.tid_tx[tid] = NULL;
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100615
616 ieee80211_agg_splice_finish(local, sta, tid);
617
618 spin_unlock(&local->ampdu_lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100619 spin_unlock_bh(&sta->lock);
620
621 rcu_read_unlock();
622}
623EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
624
Johannes Bergb8695a82009-02-10 21:25:46 +0100625void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
626 const u8 *ra, u16 tid)
627{
628 struct ieee80211_local *local = hw_to_local(hw);
629 struct ieee80211_ra_tid *ra_tid;
630 struct sk_buff *skb = dev_alloc_skb(0);
631
632 if (unlikely(!skb)) {
633#ifdef CONFIG_MAC80211_HT_DEBUG
634 if (net_ratelimit())
635 printk(KERN_WARNING "%s: Not enough memory, "
636 "dropping stop BA session", skb->dev->name);
637#endif
638 return;
639 }
640 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
641 memcpy(&ra_tid->ra, ra, ETH_ALEN);
642 ra_tid->tid = tid;
643
644 skb->pkt_type = IEEE80211_DELBA_MSG;
645 skb_queue_tail(&local->skb_queue, skb);
646 tasklet_schedule(&local->tasklet);
647}
648EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
649
Johannes Berg86ab6c52009-02-10 21:25:49 +0100650
Johannes Bergb8695a82009-02-10 21:25:46 +0100651void ieee80211_process_addba_resp(struct ieee80211_local *local,
652 struct sta_info *sta,
653 struct ieee80211_mgmt *mgmt,
654 size_t len)
655{
Johannes Bergb1720232009-03-23 17:28:39 +0100656 u16 capab, tid;
Johannes Bergb8695a82009-02-10 21:25:46 +0100657 u8 *state;
658
659 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
660 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
661
662 state = &sta->ampdu_mlme.tid_state_tx[tid];
663
664 spin_lock_bh(&sta->lock);
665
666 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
667 spin_unlock_bh(&sta->lock);
668 return;
669 }
670
671 if (mgmt->u.action.u.addba_resp.dialog_token !=
672 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
673 spin_unlock_bh(&sta->lock);
674#ifdef CONFIG_MAC80211_HT_DEBUG
675 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
676#endif /* CONFIG_MAC80211_HT_DEBUG */
677 return;
678 }
679
680 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
681#ifdef CONFIG_MAC80211_HT_DEBUG
682 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
683#endif /* CONFIG_MAC80211_HT_DEBUG */
684 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
685 == WLAN_STATUS_SUCCESS) {
Johannes Berg96f5e662009-02-12 00:51:53 +0100686 u8 curstate = *state;
Johannes Bergb8695a82009-02-10 21:25:46 +0100687
Johannes Berg96f5e662009-02-12 00:51:53 +0100688 *state |= HT_ADDBA_RECEIVED_MSK;
689
Johannes Bergb1720232009-03-23 17:28:39 +0100690 if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL)
691 ieee80211_agg_tx_operational(local, sta, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +0100692
Johannes Bergb1720232009-03-23 17:28:39 +0100693 sta->ampdu_mlme.addba_req_num[tid] = 0;
Johannes Bergb8695a82009-02-10 21:25:46 +0100694 } else {
Johannes Berg849b7962009-02-10 21:25:54 +0100695 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
Johannes Bergb8695a82009-02-10 21:25:46 +0100696 }
Johannes Berg849b7962009-02-10 21:25:54 +0100697 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +0100698}