Commit | Line | Data |
---|---|---|
b8695a8f JB |
1 | /* |
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" | |
19 | #include "wme.h" | |
20 | ||
86ab6c5a JB |
21 | /** |
22 | * DOC: TX aggregation | |
23 | * | |
24 | * Aggregation on the TX side requires setting the hardware flag | |
25 | * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues | |
26 | * hardware parameter to the number of hardware AMPDU queues. If there are no | |
27 | * hardware queues then the driver will (currently) have to do all frame | |
28 | * buffering. | |
29 | * | |
30 | * When TX aggregation is started by some subsystem (usually the rate control | |
31 | * algorithm would be appropriate) by calling the | |
32 | * ieee80211_start_tx_ba_session() function, the driver will be notified via | |
33 | * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. | |
34 | * | |
35 | * In response to that, the driver is later required to call the | |
36 | * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) | |
37 | * function, which will start the aggregation session. | |
38 | * | |
39 | * Similarly, when the aggregation session is stopped by | |
40 | * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will | |
41 | * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the | |
42 | * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() | |
43 | * (or ieee80211_stop_tx_ba_cb_irqsafe()). | |
44 | */ | |
45 | ||
b8695a8f JB |
46 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
47 | const u8 *da, u16 tid, | |
48 | u8 dialog_token, u16 start_seq_num, | |
49 | u16 agg_size, u16 timeout) | |
50 | { | |
51 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
52 | struct sk_buff *skb; |
53 | struct ieee80211_mgmt *mgmt; | |
54 | u16 capab; | |
55 | ||
56 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
57 | ||
58 | if (!skb) { | |
59 | printk(KERN_ERR "%s: failed to allocate buffer " | |
60 | "for addba request frame\n", sdata->dev->name); | |
61 | return; | |
62 | } | |
63 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
64 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
65 | memset(mgmt, 0, 24); | |
66 | memcpy(mgmt->da, da, ETH_ALEN); | |
67 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
68 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
69 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f | 70 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
71 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
72 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
73 | |
74 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
75 | IEEE80211_STYPE_ACTION); | |
76 | ||
77 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
78 | ||
79 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
80 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
81 | ||
82 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
83 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
84 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
85 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
86 | ||
87 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
88 | ||
89 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
90 | mgmt->u.action.u.addba_req.start_seq_num = | |
91 | cpu_to_le16(start_seq_num << 4); | |
92 | ||
93 | ieee80211_tx_skb(sdata, skb, 1); | |
94 | } | |
95 | ||
96 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
97 | { | |
98 | struct ieee80211_local *local = sdata->local; | |
99 | struct sk_buff *skb; | |
100 | struct ieee80211_bar *bar; | |
101 | u16 bar_control = 0; | |
102 | ||
103 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
104 | if (!skb) { | |
105 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
106 | "bar frame\n", sdata->dev->name); | |
107 | return; | |
108 | } | |
109 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
110 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
111 | memset(bar, 0, sizeof(*bar)); | |
112 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
113 | IEEE80211_STYPE_BACK_REQ); | |
114 | memcpy(bar->ra, ra, ETH_ALEN); | |
115 | memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); | |
116 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; | |
117 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
118 | bar_control |= (u16)(tid << 12); | |
119 | bar->control = cpu_to_le16(bar_control); | |
120 | bar->start_seq_num = cpu_to_le16(ssn); | |
121 | ||
122 | ieee80211_tx_skb(sdata, skb, 0); | |
123 | } | |
124 | ||
849b7967 JB |
125 | static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
126 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 127 | { |
849b7967 | 128 | struct ieee80211_local *local = sta->local; |
23e6a7ea JB |
129 | int ret; |
130 | u8 *state; | |
131 | ||
132 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
133 | ||
23e6a7ea JB |
134 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
135 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
136 | ||
137 | ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP, | |
138 | &sta->sta, tid, NULL); | |
139 | ||
140 | /* HW shall not deny going back to legacy */ | |
141 | if (WARN_ON(ret)) { | |
142 | *state = HT_AGG_STATE_OPERATIONAL; | |
cd8ffc80 JB |
143 | /* |
144 | * We may have pending packets get stuck in this case... | |
145 | * Not bothering with a workaround for now. | |
146 | */ | |
23e6a7ea JB |
147 | } |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
b8695a8f JB |
152 | /* |
153 | * After sending add Block Ack request we activated a timer until | |
154 | * add Block Ack response will arrive from the recipient. | |
155 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
156 | */ | |
157 | static void sta_addba_resp_timer_expired(unsigned long data) | |
158 | { | |
159 | /* not an elegant detour, but there is no choice as the timer passes | |
160 | * only one argument, and both sta_info and TID are needed, so init | |
161 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
162 | * array gives the sta through container_of */ | |
163 | u16 tid = *(u8 *)data; | |
23e6a7ea | 164 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 165 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
166 | u8 *state; |
167 | ||
b8695a8f | 168 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 169 | |
b8695a8f JB |
170 | /* check if the TID waits for addBA response */ |
171 | spin_lock_bh(&sta->lock); | |
172 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
173 | spin_unlock_bh(&sta->lock); | |
174 | *state = HT_AGG_STATE_IDLE; | |
175 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
176 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
177 | "expecting addBA response there", tid); | |
178 | #endif | |
23e6a7ea | 179 | return; |
b8695a8f JB |
180 | } |
181 | ||
182 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
183 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
184 | #endif | |
185 | ||
849b7967 | 186 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 187 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
188 | } |
189 | ||
96f5e66e JB |
190 | static inline int ieee80211_ac_from_tid(int tid) |
191 | { | |
192 | return ieee802_1d_to_ac[tid & 7]; | |
193 | } | |
194 | ||
b8695a8f JB |
195 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
196 | { | |
197 | struct ieee80211_local *local = hw_to_local(hw); | |
198 | struct sta_info *sta; | |
199 | struct ieee80211_sub_if_data *sdata; | |
b8695a8f | 200 | u8 *state; |
e4e72fb4 | 201 | int ret = 0; |
96f5e66e | 202 | u16 start_seq_num; |
b8695a8f | 203 | |
23e6a7ea JB |
204 | if (WARN_ON(!local->ops->ampdu_action)) |
205 | return -EINVAL; | |
206 | ||
b8695a8f JB |
207 | if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) |
208 | return -EINVAL; | |
209 | ||
210 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
211 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
212 | ra, tid); | |
213 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
214 | ||
215 | rcu_read_lock(); | |
216 | ||
217 | sta = sta_info_get(local, ra); | |
218 | if (!sta) { | |
219 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
220 | printk(KERN_DEBUG "Could not find the station\n"); | |
221 | #endif | |
222 | ret = -ENOENT; | |
96f5e66e | 223 | goto unlock; |
b8695a8f JB |
224 | } |
225 | ||
8abd3f9b JB |
226 | /* |
227 | * The aggregation code is not prepared to handle | |
228 | * anything but STA/AP due to the BSSID handling. | |
229 | * IBSS could work in the code but isn't supported | |
230 | * by drivers or the standard. | |
231 | */ | |
232 | if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && | |
233 | sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
234 | sta->sdata->vif.type != NL80211_IFTYPE_AP) { | |
235 | ret = -EINVAL; | |
96f5e66e | 236 | goto unlock; |
8abd3f9b JB |
237 | } |
238 | ||
722f069a S |
239 | if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { |
240 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
241 | printk(KERN_DEBUG "Suspend in progress. " | |
242 | "Denying BA session request\n"); | |
243 | #endif | |
244 | ret = -EINVAL; | |
245 | goto unlock; | |
246 | } | |
247 | ||
b8695a8f | 248 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 249 | spin_lock(&local->ampdu_lock); |
b8695a8f | 250 | |
96f5e66e JB |
251 | sdata = sta->sdata; |
252 | ||
b8695a8f JB |
253 | /* we have tried too many times, receiver does not want A-MPDU */ |
254 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
255 | ret = -EBUSY; | |
256 | goto err_unlock_sta; | |
257 | } | |
258 | ||
259 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
260 | /* check if the TID is not in aggregation flow already */ | |
261 | if (*state != HT_AGG_STATE_IDLE) { | |
262 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
263 | printk(KERN_DEBUG "BA request denied - session is not " | |
264 | "idle on tid %u\n", tid); | |
265 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
266 | ret = -EAGAIN; | |
267 | goto err_unlock_sta; | |
268 | } | |
269 | ||
cd8ffc80 JB |
270 | /* |
271 | * While we're asking the driver about the aggregation, | |
272 | * stop the AC queue so that we don't have to worry | |
273 | * about frames that came in while we were doing that, | |
274 | * which would require us to put them to the AC pending | |
275 | * afterwards which just makes the code more complex. | |
276 | */ | |
277 | ieee80211_stop_queue_by_reason( | |
278 | &local->hw, ieee80211_ac_from_tid(tid), | |
279 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
280 | ||
b8695a8f JB |
281 | /* prepare A-MPDU MLME for Tx aggregation */ |
282 | sta->ampdu_mlme.tid_tx[tid] = | |
283 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
284 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
285 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
286 | if (net_ratelimit()) | |
287 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
288 | tid); | |
289 | #endif | |
290 | ret = -ENOMEM; | |
e4e72fb4 | 291 | goto err_wake_queue; |
b8695a8f | 292 | } |
96f5e66e | 293 | |
cd8ffc80 JB |
294 | skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); |
295 | ||
b8695a8f JB |
296 | /* Tx timer */ |
297 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
298 | sta_addba_resp_timer_expired; | |
299 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
300 | (unsigned long)&sta->timer_to_tid[tid]; | |
301 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
302 | ||
b8695a8f JB |
303 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
304 | * call back right away, it must see that the flow has begun */ | |
305 | *state |= HT_ADDBA_REQUESTED_MSK; | |
306 | ||
b8695a8f JB |
307 | start_seq_num = sta->tid_seq[tid]; |
308 | ||
23e6a7ea JB |
309 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, |
310 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
311 | |
312 | if (ret) { | |
b8695a8f JB |
313 | #ifdef CONFIG_MAC80211_HT_DEBUG |
314 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
315 | " tid %d\n", tid); | |
316 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
317 | *state = HT_AGG_STATE_IDLE; | |
96f5e66e | 318 | goto err_free; |
b8695a8f JB |
319 | } |
320 | ||
cd8ffc80 JB |
321 | /* Driver vetoed or OKed, but we can take packets again now */ |
322 | ieee80211_wake_queue_by_reason( | |
323 | &local->hw, ieee80211_ac_from_tid(tid), | |
324 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
325 | ||
326 | spin_unlock(&local->ampdu_lock); | |
b8695a8f JB |
327 | spin_unlock_bh(&sta->lock); |
328 | ||
329 | /* send an addBA request */ | |
330 | sta->ampdu_mlme.dialog_token_allocator++; | |
331 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
332 | sta->ampdu_mlme.dialog_token_allocator; | |
333 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
334 | ||
b8695a8f JB |
335 | ieee80211_send_addba_request(sta->sdata, ra, tid, |
336 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, | |
337 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
338 | 0x40, 5000); | |
339 | /* activate the timer for the recipient's addBA response */ | |
340 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
341 | jiffies + ADDBA_RESP_INTERVAL; | |
342 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
343 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
344 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
345 | #endif | |
96f5e66e | 346 | goto unlock; |
b8695a8f | 347 | |
96f5e66e | 348 | err_free: |
b8695a8f JB |
349 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
350 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
e4e72fb4 | 351 | err_wake_queue: |
cd8ffc80 JB |
352 | ieee80211_wake_queue_by_reason( |
353 | &local->hw, ieee80211_ac_from_tid(tid), | |
354 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
96f5e66e | 355 | err_unlock_sta: |
cd8ffc80 | 356 | spin_unlock(&local->ampdu_lock); |
b8695a8f | 357 | spin_unlock_bh(&sta->lock); |
96f5e66e | 358 | unlock: |
b8695a8f JB |
359 | rcu_read_unlock(); |
360 | return ret; | |
361 | } | |
362 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
363 | ||
cd8ffc80 JB |
364 | /* |
365 | * splice packets from the STA's pending to the local pending, | |
366 | * requires a call to ieee80211_agg_splice_finish and holding | |
367 | * local->ampdu_lock across both calls. | |
368 | */ | |
369 | static void ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
370 | struct sta_info *sta, u16 tid) | |
371 | { | |
372 | unsigned long flags; | |
373 | u16 queue = ieee80211_ac_from_tid(tid); | |
374 | ||
375 | ieee80211_stop_queue_by_reason( | |
376 | &local->hw, queue, | |
377 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
378 | ||
379 | if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { | |
380 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
381 | /* mark queue as pending, it is stopped already */ | |
382 | __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING, | |
383 | &local->queue_stop_reasons[queue]); | |
384 | /* copy over remaining packets */ | |
385 | skb_queue_splice_tail_init( | |
386 | &sta->ampdu_mlme.tid_tx[tid]->pending, | |
387 | &local->pending[queue]); | |
388 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
389 | } | |
390 | } | |
391 | ||
392 | static void ieee80211_agg_splice_finish(struct ieee80211_local *local, | |
393 | struct sta_info *sta, u16 tid) | |
394 | { | |
395 | u16 queue = ieee80211_ac_from_tid(tid); | |
396 | ||
397 | ieee80211_wake_queue_by_reason( | |
398 | &local->hw, queue, | |
399 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
400 | } | |
401 | ||
402 | /* caller must hold sta->lock */ | |
b1720231 JB |
403 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
404 | struct sta_info *sta, u16 tid) | |
405 | { | |
406 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
407 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
408 | #endif | |
409 | ||
cd8ffc80 JB |
410 | spin_lock(&local->ampdu_lock); |
411 | ieee80211_agg_splice_packets(local, sta, tid); | |
412 | /* | |
413 | * NB: we rely on sta->lock being taken in the TX | |
414 | * processing here when adding to the pending queue, | |
415 | * otherwise we could only change the state of the | |
416 | * session to OPERATIONAL _here_. | |
417 | */ | |
418 | ieee80211_agg_splice_finish(local, sta, tid); | |
419 | spin_unlock(&local->ampdu_lock); | |
b1720231 JB |
420 | |
421 | local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_OPERATIONAL, | |
422 | &sta->sta, tid, NULL); | |
423 | } | |
424 | ||
b8695a8f JB |
425 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
426 | { | |
427 | struct ieee80211_local *local = hw_to_local(hw); | |
428 | struct sta_info *sta; | |
429 | u8 *state; | |
430 | ||
431 | if (tid >= STA_TID_NUM) { | |
432 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
433 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
434 | tid, STA_TID_NUM); | |
435 | #endif | |
436 | return; | |
437 | } | |
438 | ||
439 | rcu_read_lock(); | |
440 | sta = sta_info_get(local, ra); | |
441 | if (!sta) { | |
442 | rcu_read_unlock(); | |
443 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
444 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
445 | #endif | |
446 | return; | |
447 | } | |
448 | ||
449 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
450 | spin_lock_bh(&sta->lock); | |
451 | ||
96f5e66e | 452 | if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
b8695a8f JB |
453 | #ifdef CONFIG_MAC80211_HT_DEBUG |
454 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
455 | *state); | |
456 | #endif | |
457 | spin_unlock_bh(&sta->lock); | |
458 | rcu_read_unlock(); | |
459 | return; | |
460 | } | |
461 | ||
96f5e66e JB |
462 | if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
463 | goto out; | |
b8695a8f JB |
464 | |
465 | *state |= HT_ADDBA_DRV_READY_MSK; | |
466 | ||
b1720231 JB |
467 | if (*state == HT_AGG_STATE_OPERATIONAL) |
468 | ieee80211_agg_tx_operational(local, sta, tid); | |
96f5e66e JB |
469 | |
470 | out: | |
b8695a8f JB |
471 | spin_unlock_bh(&sta->lock); |
472 | rcu_read_unlock(); | |
473 | } | |
474 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
475 | ||
86ab6c5a JB |
476 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
477 | const u8 *ra, u16 tid) | |
478 | { | |
479 | struct ieee80211_local *local = hw_to_local(hw); | |
480 | struct ieee80211_ra_tid *ra_tid; | |
481 | struct sk_buff *skb = dev_alloc_skb(0); | |
482 | ||
483 | if (unlikely(!skb)) { | |
484 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
485 | if (net_ratelimit()) | |
486 | printk(KERN_WARNING "%s: Not enough memory, " | |
487 | "dropping start BA session", skb->dev->name); | |
488 | #endif | |
489 | return; | |
490 | } | |
491 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
492 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
493 | ra_tid->tid = tid; | |
494 | ||
495 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
496 | skb_queue_tail(&local->skb_queue, skb); | |
497 | tasklet_schedule(&local->tasklet); | |
498 | } | |
499 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
500 | ||
849b7967 JB |
501 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
502 | enum ieee80211_back_parties initiator) | |
503 | { | |
504 | u8 *state; | |
505 | int ret; | |
506 | ||
507 | /* check if the TID is in aggregation */ | |
508 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
509 | spin_lock_bh(&sta->lock); | |
510 | ||
511 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
512 | ret = -ENOENT; | |
513 | goto unlock; | |
514 | } | |
515 | ||
516 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
517 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
518 | sta->sta.addr, tid); | |
519 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
520 | ||
521 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); | |
522 | ||
523 | unlock: | |
524 | spin_unlock_bh(&sta->lock); | |
525 | return ret; | |
526 | } | |
b8695a8f JB |
527 | |
528 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
529 | u8 *ra, u16 tid, | |
530 | enum ieee80211_back_parties initiator) | |
531 | { | |
532 | struct ieee80211_local *local = hw_to_local(hw); | |
533 | struct sta_info *sta; | |
b8695a8f JB |
534 | int ret = 0; |
535 | ||
23e6a7ea JB |
536 | if (WARN_ON(!local->ops->ampdu_action)) |
537 | return -EINVAL; | |
538 | ||
b8695a8f JB |
539 | if (tid >= STA_TID_NUM) |
540 | return -EINVAL; | |
541 | ||
542 | rcu_read_lock(); | |
543 | sta = sta_info_get(local, ra); | |
544 | if (!sta) { | |
545 | rcu_read_unlock(); | |
546 | return -ENOENT; | |
547 | } | |
548 | ||
849b7967 | 549 | ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
550 | rcu_read_unlock(); |
551 | return ret; | |
552 | } | |
553 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
554 | ||
555 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
556 | { | |
557 | struct ieee80211_local *local = hw_to_local(hw); | |
558 | struct sta_info *sta; | |
559 | u8 *state; | |
b8695a8f JB |
560 | |
561 | if (tid >= STA_TID_NUM) { | |
562 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
563 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
564 | tid, STA_TID_NUM); | |
565 | #endif | |
566 | return; | |
567 | } | |
568 | ||
569 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
570 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
571 | ra, tid); | |
572 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
573 | ||
574 | rcu_read_lock(); | |
575 | sta = sta_info_get(local, ra); | |
576 | if (!sta) { | |
577 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
578 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
579 | #endif | |
580 | rcu_read_unlock(); | |
581 | return; | |
582 | } | |
583 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
584 | ||
585 | /* NOTE: no need to use sta->lock in this state check, as | |
586 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
587 | * pass through per sta/tid | |
588 | */ | |
589 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
590 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
591 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
592 | #endif | |
593 | rcu_read_unlock(); | |
594 | return; | |
595 | } | |
596 | ||
597 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
598 | ieee80211_send_delba(sta->sdata, ra, tid, | |
599 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
600 | ||
96f5e66e | 601 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 602 | spin_lock(&local->ampdu_lock); |
b8695a8f | 603 | |
cd8ffc80 | 604 | ieee80211_agg_splice_packets(local, sta, tid); |
96f5e66e | 605 | |
b8695a8f | 606 | *state = HT_AGG_STATE_IDLE; |
cd8ffc80 | 607 | /* from now on packets are no longer put onto sta->pending */ |
b8695a8f JB |
608 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
609 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
610 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
cd8ffc80 JB |
611 | |
612 | ieee80211_agg_splice_finish(local, sta, tid); | |
613 | ||
614 | spin_unlock(&local->ampdu_lock); | |
b8695a8f JB |
615 | spin_unlock_bh(&sta->lock); |
616 | ||
617 | rcu_read_unlock(); | |
618 | } | |
619 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
620 | ||
b8695a8f JB |
621 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
622 | const u8 *ra, u16 tid) | |
623 | { | |
624 | struct ieee80211_local *local = hw_to_local(hw); | |
625 | struct ieee80211_ra_tid *ra_tid; | |
626 | struct sk_buff *skb = dev_alloc_skb(0); | |
627 | ||
628 | if (unlikely(!skb)) { | |
629 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
630 | if (net_ratelimit()) | |
631 | printk(KERN_WARNING "%s: Not enough memory, " | |
632 | "dropping stop BA session", skb->dev->name); | |
633 | #endif | |
634 | return; | |
635 | } | |
636 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
637 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
638 | ra_tid->tid = tid; | |
639 | ||
640 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
641 | skb_queue_tail(&local->skb_queue, skb); | |
642 | tasklet_schedule(&local->tasklet); | |
643 | } | |
644 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
645 | ||
86ab6c5a | 646 | |
b8695a8f JB |
647 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
648 | struct sta_info *sta, | |
649 | struct ieee80211_mgmt *mgmt, | |
650 | size_t len) | |
651 | { | |
b1720231 | 652 | u16 capab, tid; |
b8695a8f JB |
653 | u8 *state; |
654 | ||
655 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
656 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
657 | ||
658 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
659 | ||
660 | spin_lock_bh(&sta->lock); | |
661 | ||
662 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
663 | spin_unlock_bh(&sta->lock); | |
664 | return; | |
665 | } | |
666 | ||
667 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
668 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
669 | spin_unlock_bh(&sta->lock); | |
670 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
671 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
672 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
673 | return; | |
674 | } | |
675 | ||
676 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
677 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
678 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
679 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
680 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
681 | == WLAN_STATUS_SUCCESS) { | |
96f5e66e JB |
682 | u8 curstate = *state; |
683 | ||
b8695a8f | 684 | *state |= HT_ADDBA_RECEIVED_MSK; |
b8695a8f | 685 | |
b1720231 JB |
686 | if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) |
687 | ieee80211_agg_tx_operational(local, sta, tid); | |
b8695a8f | 688 | |
b1720231 | 689 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f JB |
690 | } else { |
691 | sta->ampdu_mlme.addba_req_num[tid]++; | |
849b7967 | 692 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 693 | } |
849b7967 | 694 | spin_unlock_bh(&sta->lock); |
b8695a8f | 695 | } |