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Commit | Line | Data |
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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" | |
24487981 | 19 | #include "driver-ops.h" |
b8695a8f JB |
20 | #include "wme.h" |
21 | ||
86ab6c5a JB |
22 | /** |
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 | ||
b8695a8f JB |
47 | static 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; | |
b8695a8f JB |
53 | 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); | |
8abd3f9b JB |
69 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
70 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f | 71 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
72 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
73 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
74 | |
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 | ||
97 | void 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 | ||
849b7967 JB |
126 | static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
127 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 128 | { |
849b7967 | 129 | struct ieee80211_local *local = sta->local; |
23e6a7ea JB |
130 | int ret; |
131 | u8 *state; | |
132 | ||
133 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
134 | ||
736708bd VT |
135 | if (*state == HT_AGG_STATE_OPERATIONAL) |
136 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
137 | ||
23e6a7ea JB |
138 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
139 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
140 | ||
24487981 JB |
141 | ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_STOP, |
142 | &sta->sta, tid, NULL); | |
23e6a7ea JB |
143 | |
144 | /* HW shall not deny going back to legacy */ | |
145 | if (WARN_ON(ret)) { | |
146 | *state = HT_AGG_STATE_OPERATIONAL; | |
cd8ffc80 JB |
147 | /* |
148 | * We may have pending packets get stuck in this case... | |
149 | * Not bothering with a workaround for now. | |
150 | */ | |
23e6a7ea JB |
151 | } |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
b8695a8f JB |
156 | /* |
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 | */ | |
161 | static 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; | |
23e6a7ea | 168 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 169 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
170 | u8 *state; |
171 | ||
b8695a8f | 172 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 173 | |
b8695a8f JB |
174 | /* 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 | |
23e6a7ea | 183 | return; |
b8695a8f JB |
184 | } |
185 | ||
186 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
187 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
188 | #endif | |
189 | ||
849b7967 | 190 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 191 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
192 | } |
193 | ||
96f5e66e JB |
194 | static inline int ieee80211_ac_from_tid(int tid) |
195 | { | |
196 | return ieee802_1d_to_ac[tid & 7]; | |
197 | } | |
198 | ||
b8695a8f JB |
199 | int 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; | |
b8695a8f | 204 | u8 *state; |
e4e72fb4 | 205 | int ret = 0; |
96f5e66e | 206 | u16 start_seq_num; |
b8695a8f | 207 | |
23e6a7ea JB |
208 | if (WARN_ON(!local->ops->ampdu_action)) |
209 | return -EINVAL; | |
210 | ||
b8695a8f JB |
211 | 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; | |
96f5e66e | 227 | goto unlock; |
b8695a8f JB |
228 | } |
229 | ||
8abd3f9b JB |
230 | /* |
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; | |
96f5e66e | 240 | goto unlock; |
8abd3f9b JB |
241 | } |
242 | ||
722f069a S |
243 | 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 | ||
b8695a8f | 252 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 253 | spin_lock(&local->ampdu_lock); |
b8695a8f | 254 | |
96f5e66e JB |
255 | sdata = sta->sdata; |
256 | ||
b8695a8f JB |
257 | /* 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 | ||
cd8ffc80 JB |
274 | /* |
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 | ||
b8695a8f JB |
285 | /* 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; | |
e4e72fb4 | 295 | goto err_wake_queue; |
b8695a8f | 296 | } |
96f5e66e | 297 | |
cd8ffc80 JB |
298 | skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); |
299 | ||
b8695a8f JB |
300 | /* 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 | ||
b8695a8f JB |
307 | /* 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 | ||
b8695a8f JB |
311 | start_seq_num = sta->tid_seq[tid]; |
312 | ||
24487981 JB |
313 | ret = drv_ampdu_action(local, IEEE80211_AMPDU_TX_START, |
314 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
315 | |
316 | if (ret) { | |
b8695a8f JB |
317 | #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; | |
96f5e66e | 322 | goto err_free; |
b8695a8f JB |
323 | } |
324 | ||
cd8ffc80 JB |
325 | /* 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); | |
b8695a8f JB |
331 | 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 | ||
b8695a8f JB |
339 | 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); | |
736708bd | 343 | sta->ampdu_mlme.addba_req_num[tid]++; |
b8695a8f JB |
344 | /* 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 | |
96f5e66e | 351 | goto unlock; |
b8695a8f | 352 | |
96f5e66e | 353 | err_free: |
b8695a8f JB |
354 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
355 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
e4e72fb4 | 356 | err_wake_queue: |
cd8ffc80 JB |
357 | ieee80211_wake_queue_by_reason( |
358 | &local->hw, ieee80211_ac_from_tid(tid), | |
359 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
96f5e66e | 360 | err_unlock_sta: |
cd8ffc80 | 361 | spin_unlock(&local->ampdu_lock); |
b8695a8f | 362 | spin_unlock_bh(&sta->lock); |
96f5e66e | 363 | unlock: |
b8695a8f JB |
364 | rcu_read_unlock(); |
365 | return ret; | |
366 | } | |
367 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
368 | ||
cd8ffc80 JB |
369 | /* |
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 | */ | |
374 | static 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 | ||
416fbdff LR |
384 | if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)) |
385 | return; | |
386 | ||
387 | if (WARN(!sta->ampdu_mlme.tid_tx[tid], | |
388 | "TID %d gone but expected when splicing aggregates from" | |
389 | "the pending queue\n", tid)) | |
390 | return; | |
391 | ||
cd8ffc80 JB |
392 | if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { |
393 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
cd8ffc80 JB |
394 | /* copy over remaining packets */ |
395 | skb_queue_splice_tail_init( | |
396 | &sta->ampdu_mlme.tid_tx[tid]->pending, | |
397 | &local->pending[queue]); | |
398 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
399 | } | |
400 | } | |
401 | ||
402 | static void ieee80211_agg_splice_finish(struct ieee80211_local *local, | |
403 | struct sta_info *sta, u16 tid) | |
404 | { | |
405 | u16 queue = ieee80211_ac_from_tid(tid); | |
406 | ||
407 | ieee80211_wake_queue_by_reason( | |
408 | &local->hw, queue, | |
409 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
410 | } | |
411 | ||
412 | /* caller must hold sta->lock */ | |
b1720231 JB |
413 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
414 | struct sta_info *sta, u16 tid) | |
415 | { | |
416 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
417 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
418 | #endif | |
419 | ||
cd8ffc80 JB |
420 | spin_lock(&local->ampdu_lock); |
421 | ieee80211_agg_splice_packets(local, sta, tid); | |
422 | /* | |
423 | * NB: we rely on sta->lock being taken in the TX | |
424 | * processing here when adding to the pending queue, | |
425 | * otherwise we could only change the state of the | |
426 | * session to OPERATIONAL _here_. | |
427 | */ | |
428 | ieee80211_agg_splice_finish(local, sta, tid); | |
429 | spin_unlock(&local->ampdu_lock); | |
b1720231 | 430 | |
24487981 JB |
431 | drv_ampdu_action(local, IEEE80211_AMPDU_TX_OPERATIONAL, |
432 | &sta->sta, tid, NULL); | |
b1720231 JB |
433 | } |
434 | ||
b8695a8f JB |
435 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
436 | { | |
437 | struct ieee80211_local *local = hw_to_local(hw); | |
438 | struct sta_info *sta; | |
439 | u8 *state; | |
440 | ||
441 | if (tid >= STA_TID_NUM) { | |
442 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
443 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
444 | tid, STA_TID_NUM); | |
445 | #endif | |
446 | return; | |
447 | } | |
448 | ||
449 | rcu_read_lock(); | |
450 | sta = sta_info_get(local, ra); | |
451 | if (!sta) { | |
452 | rcu_read_unlock(); | |
453 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
454 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
455 | #endif | |
456 | return; | |
457 | } | |
458 | ||
459 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
460 | spin_lock_bh(&sta->lock); | |
461 | ||
96f5e66e | 462 | if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
b8695a8f JB |
463 | #ifdef CONFIG_MAC80211_HT_DEBUG |
464 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
465 | *state); | |
466 | #endif | |
467 | spin_unlock_bh(&sta->lock); | |
468 | rcu_read_unlock(); | |
469 | return; | |
470 | } | |
471 | ||
96f5e66e JB |
472 | if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
473 | goto out; | |
b8695a8f JB |
474 | |
475 | *state |= HT_ADDBA_DRV_READY_MSK; | |
476 | ||
b1720231 JB |
477 | if (*state == HT_AGG_STATE_OPERATIONAL) |
478 | ieee80211_agg_tx_operational(local, sta, tid); | |
96f5e66e JB |
479 | |
480 | out: | |
b8695a8f JB |
481 | spin_unlock_bh(&sta->lock); |
482 | rcu_read_unlock(); | |
483 | } | |
484 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
485 | ||
86ab6c5a JB |
486 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
487 | const u8 *ra, u16 tid) | |
488 | { | |
489 | struct ieee80211_local *local = hw_to_local(hw); | |
490 | struct ieee80211_ra_tid *ra_tid; | |
491 | struct sk_buff *skb = dev_alloc_skb(0); | |
492 | ||
493 | if (unlikely(!skb)) { | |
494 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
495 | if (net_ratelimit()) | |
496 | printk(KERN_WARNING "%s: Not enough memory, " | |
497 | "dropping start BA session", skb->dev->name); | |
498 | #endif | |
499 | return; | |
500 | } | |
501 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
502 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
503 | ra_tid->tid = tid; | |
504 | ||
505 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
506 | skb_queue_tail(&local->skb_queue, skb); | |
507 | tasklet_schedule(&local->tasklet); | |
508 | } | |
509 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
510 | ||
849b7967 JB |
511 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
512 | enum ieee80211_back_parties initiator) | |
513 | { | |
514 | u8 *state; | |
515 | int ret; | |
516 | ||
517 | /* check if the TID is in aggregation */ | |
518 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
519 | spin_lock_bh(&sta->lock); | |
520 | ||
521 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
522 | ret = -ENOENT; | |
523 | goto unlock; | |
524 | } | |
525 | ||
526 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
527 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
528 | sta->sta.addr, tid); | |
529 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
530 | ||
531 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); | |
532 | ||
533 | unlock: | |
534 | spin_unlock_bh(&sta->lock); | |
535 | return ret; | |
536 | } | |
b8695a8f JB |
537 | |
538 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
539 | u8 *ra, u16 tid, | |
540 | enum ieee80211_back_parties initiator) | |
541 | { | |
542 | struct ieee80211_local *local = hw_to_local(hw); | |
543 | struct sta_info *sta; | |
b8695a8f JB |
544 | int ret = 0; |
545 | ||
23e6a7ea JB |
546 | if (WARN_ON(!local->ops->ampdu_action)) |
547 | return -EINVAL; | |
548 | ||
b8695a8f JB |
549 | if (tid >= STA_TID_NUM) |
550 | return -EINVAL; | |
551 | ||
552 | rcu_read_lock(); | |
553 | sta = sta_info_get(local, ra); | |
554 | if (!sta) { | |
555 | rcu_read_unlock(); | |
556 | return -ENOENT; | |
557 | } | |
558 | ||
849b7967 | 559 | ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
560 | rcu_read_unlock(); |
561 | return ret; | |
562 | } | |
563 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
564 | ||
565 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
566 | { | |
567 | struct ieee80211_local *local = hw_to_local(hw); | |
568 | struct sta_info *sta; | |
569 | u8 *state; | |
b8695a8f JB |
570 | |
571 | if (tid >= STA_TID_NUM) { | |
572 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
573 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
574 | tid, STA_TID_NUM); | |
575 | #endif | |
576 | return; | |
577 | } | |
578 | ||
579 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
580 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
581 | ra, tid); | |
582 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
583 | ||
584 | rcu_read_lock(); | |
585 | sta = sta_info_get(local, ra); | |
586 | if (!sta) { | |
587 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
588 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
589 | #endif | |
590 | rcu_read_unlock(); | |
591 | return; | |
592 | } | |
593 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
594 | ||
595 | /* NOTE: no need to use sta->lock in this state check, as | |
596 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
597 | * pass through per sta/tid | |
598 | */ | |
599 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
600 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
601 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
602 | #endif | |
603 | rcu_read_unlock(); | |
604 | return; | |
605 | } | |
606 | ||
607 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
608 | ieee80211_send_delba(sta->sdata, ra, tid, | |
609 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
610 | ||
96f5e66e | 611 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 612 | spin_lock(&local->ampdu_lock); |
b8695a8f | 613 | |
cd8ffc80 | 614 | ieee80211_agg_splice_packets(local, sta, tid); |
96f5e66e | 615 | |
b8695a8f | 616 | *state = HT_AGG_STATE_IDLE; |
cd8ffc80 | 617 | /* from now on packets are no longer put onto sta->pending */ |
b8695a8f JB |
618 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
619 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
cd8ffc80 JB |
620 | |
621 | ieee80211_agg_splice_finish(local, sta, tid); | |
622 | ||
623 | spin_unlock(&local->ampdu_lock); | |
b8695a8f JB |
624 | spin_unlock_bh(&sta->lock); |
625 | ||
626 | rcu_read_unlock(); | |
627 | } | |
628 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
629 | ||
b8695a8f JB |
630 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
631 | const u8 *ra, u16 tid) | |
632 | { | |
633 | struct ieee80211_local *local = hw_to_local(hw); | |
634 | struct ieee80211_ra_tid *ra_tid; | |
635 | struct sk_buff *skb = dev_alloc_skb(0); | |
636 | ||
637 | if (unlikely(!skb)) { | |
638 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
639 | if (net_ratelimit()) | |
640 | printk(KERN_WARNING "%s: Not enough memory, " | |
641 | "dropping stop BA session", skb->dev->name); | |
642 | #endif | |
643 | return; | |
644 | } | |
645 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
646 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
647 | ra_tid->tid = tid; | |
648 | ||
649 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
650 | skb_queue_tail(&local->skb_queue, skb); | |
651 | tasklet_schedule(&local->tasklet); | |
652 | } | |
653 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
654 | ||
86ab6c5a | 655 | |
b8695a8f JB |
656 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
657 | struct sta_info *sta, | |
658 | struct ieee80211_mgmt *mgmt, | |
659 | size_t len) | |
660 | { | |
b1720231 | 661 | u16 capab, tid; |
b8695a8f JB |
662 | u8 *state; |
663 | ||
664 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
665 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
666 | ||
667 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
668 | ||
669 | spin_lock_bh(&sta->lock); | |
670 | ||
671 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
672 | spin_unlock_bh(&sta->lock); | |
673 | return; | |
674 | } | |
675 | ||
676 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
677 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
678 | spin_unlock_bh(&sta->lock); | |
679 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
680 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
681 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
682 | return; | |
683 | } | |
684 | ||
685 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
686 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
687 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
688 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
689 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
690 | == WLAN_STATUS_SUCCESS) { | |
96f5e66e JB |
691 | u8 curstate = *state; |
692 | ||
b8695a8f | 693 | *state |= HT_ADDBA_RECEIVED_MSK; |
b8695a8f | 694 | |
b1720231 JB |
695 | if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) |
696 | ieee80211_agg_tx_operational(local, sta, tid); | |
b8695a8f | 697 | |
b1720231 | 698 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 699 | } else { |
849b7967 | 700 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 701 | } |
849b7967 | 702 | spin_unlock_bh(&sta->lock); |
b8695a8f | 703 | } |