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" | |
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 " | |
47846c9b | 61 | "for addba request frame\n", sdata->name); |
b8695a8f JB |
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); | |
47846c9b | 68 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
69 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
70 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 71 | memcpy(mgmt->bssid, sdata->vif.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 | ||
62ae67be | 94 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
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 " | |
47846c9b | 107 | "bar frame\n", sdata->name); |
b8695a8f JB |
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); | |
47846c9b | 116 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
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 | ||
62ae67be JB |
123 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
124 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f JB |
125 | } |
126 | ||
827d42c9 JB |
127 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
128 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 129 | { |
849b7967 | 130 | struct ieee80211_local *local = sta->local; |
23e6a7ea JB |
131 | int ret; |
132 | u8 *state; | |
133 | ||
827d42c9 JB |
134 | #ifdef CONFIG_MAC80211_HT_DEBUG |
135 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
136 | sta->sta.addr, tid); | |
137 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
138 | ||
23e6a7ea JB |
139 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
140 | ||
736708bd VT |
141 | if (*state == HT_AGG_STATE_OPERATIONAL) |
142 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
143 | ||
23e6a7ea JB |
144 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
145 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
146 | ||
12375ef9 | 147 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 148 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 149 | &sta->sta, tid, NULL); |
23e6a7ea JB |
150 | |
151 | /* HW shall not deny going back to legacy */ | |
152 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
153 | /* |
154 | * We may have pending packets get stuck in this case... | |
155 | * Not bothering with a workaround for now. | |
156 | */ | |
23e6a7ea JB |
157 | } |
158 | ||
159 | return ret; | |
160 | } | |
161 | ||
b8695a8f JB |
162 | /* |
163 | * After sending add Block Ack request we activated a timer until | |
164 | * add Block Ack response will arrive from the recipient. | |
165 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
166 | */ | |
167 | static void sta_addba_resp_timer_expired(unsigned long data) | |
168 | { | |
169 | /* not an elegant detour, but there is no choice as the timer passes | |
170 | * only one argument, and both sta_info and TID are needed, so init | |
171 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
172 | * array gives the sta through container_of */ | |
173 | u16 tid = *(u8 *)data; | |
23e6a7ea | 174 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 175 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
176 | u8 *state; |
177 | ||
b8695a8f | 178 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 179 | |
b8695a8f JB |
180 | /* check if the TID waits for addBA response */ |
181 | spin_lock_bh(&sta->lock); | |
8ade0082 JB |
182 | if ((*state & (HT_ADDBA_REQUESTED_MSK | HT_ADDBA_RECEIVED_MSK)) != |
183 | HT_ADDBA_REQUESTED_MSK) { | |
b8695a8f JB |
184 | spin_unlock_bh(&sta->lock); |
185 | *state = HT_AGG_STATE_IDLE; | |
186 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
187 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
8ade0082 JB |
188 | "(or no longer) expecting addBA response there", |
189 | tid); | |
b8695a8f | 190 | #endif |
23e6a7ea | 191 | return; |
b8695a8f JB |
192 | } |
193 | ||
194 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
195 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
196 | #endif | |
197 | ||
849b7967 | 198 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 199 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
200 | } |
201 | ||
96f5e66e JB |
202 | static inline int ieee80211_ac_from_tid(int tid) |
203 | { | |
204 | return ieee802_1d_to_ac[tid & 7]; | |
205 | } | |
206 | ||
c951ad35 | 207 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 208 | { |
c951ad35 JB |
209 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
210 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
211 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 212 | u8 *state; |
e4e72fb4 | 213 | int ret = 0; |
96f5e66e | 214 | u16 start_seq_num; |
b8695a8f | 215 | |
23e6a7ea JB |
216 | if (WARN_ON(!local->ops->ampdu_action)) |
217 | return -EINVAL; | |
218 | ||
c951ad35 JB |
219 | if ((tid >= STA_TID_NUM) || |
220 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
221 | return -EINVAL; |
222 | ||
223 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
224 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 225 | pubsta->addr, tid); |
b8695a8f JB |
226 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
227 | ||
8abd3f9b JB |
228 | /* |
229 | * The aggregation code is not prepared to handle | |
230 | * anything but STA/AP due to the BSSID handling. | |
231 | * IBSS could work in the code but isn't supported | |
232 | * by drivers or the standard. | |
233 | */ | |
c951ad35 JB |
234 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
235 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
236 | sdata->vif.type != NL80211_IFTYPE_AP) | |
237 | return -EINVAL; | |
8abd3f9b | 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 | |
c951ad35 | 244 | return -EINVAL; |
722f069a S |
245 | } |
246 | ||
b8695a8f | 247 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 248 | spin_lock(&local->ampdu_lock); |
b8695a8f JB |
249 | |
250 | /* we have tried too many times, receiver does not want A-MPDU */ | |
251 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
252 | ret = -EBUSY; | |
253 | goto err_unlock_sta; | |
254 | } | |
255 | ||
256 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
257 | /* check if the TID is not in aggregation flow already */ | |
258 | if (*state != HT_AGG_STATE_IDLE) { | |
259 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
260 | printk(KERN_DEBUG "BA request denied - session is not " | |
261 | "idle on tid %u\n", tid); | |
262 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
263 | ret = -EAGAIN; | |
264 | goto err_unlock_sta; | |
265 | } | |
266 | ||
cd8ffc80 JB |
267 | /* |
268 | * While we're asking the driver about the aggregation, | |
269 | * stop the AC queue so that we don't have to worry | |
270 | * about frames that came in while we were doing that, | |
271 | * which would require us to put them to the AC pending | |
272 | * afterwards which just makes the code more complex. | |
273 | */ | |
274 | ieee80211_stop_queue_by_reason( | |
275 | &local->hw, ieee80211_ac_from_tid(tid), | |
276 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
277 | ||
b8695a8f JB |
278 | /* prepare A-MPDU MLME for Tx aggregation */ |
279 | sta->ampdu_mlme.tid_tx[tid] = | |
280 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
281 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
282 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
283 | if (net_ratelimit()) | |
284 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
285 | tid); | |
286 | #endif | |
287 | ret = -ENOMEM; | |
e4e72fb4 | 288 | goto err_wake_queue; |
b8695a8f | 289 | } |
96f5e66e | 290 | |
cd8ffc80 JB |
291 | skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); |
292 | ||
b8695a8f JB |
293 | /* Tx timer */ |
294 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
295 | sta_addba_resp_timer_expired; | |
296 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
297 | (unsigned long)&sta->timer_to_tid[tid]; | |
298 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
299 | ||
b8695a8f JB |
300 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
301 | * call back right away, it must see that the flow has begun */ | |
302 | *state |= HT_ADDBA_REQUESTED_MSK; | |
303 | ||
b8695a8f JB |
304 | start_seq_num = sta->tid_seq[tid]; |
305 | ||
12375ef9 | 306 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, |
c951ad35 | 307 | pubsta, tid, &start_seq_num); |
b8695a8f JB |
308 | |
309 | if (ret) { | |
b8695a8f JB |
310 | #ifdef CONFIG_MAC80211_HT_DEBUG |
311 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
312 | " tid %d\n", tid); | |
313 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
314 | *state = HT_AGG_STATE_IDLE; | |
96f5e66e | 315 | goto err_free; |
b8695a8f JB |
316 | } |
317 | ||
cd8ffc80 JB |
318 | /* Driver vetoed or OKed, but we can take packets again now */ |
319 | ieee80211_wake_queue_by_reason( | |
320 | &local->hw, ieee80211_ac_from_tid(tid), | |
321 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
322 | ||
323 | spin_unlock(&local->ampdu_lock); | |
b8695a8f JB |
324 | spin_unlock_bh(&sta->lock); |
325 | ||
326 | /* send an addBA request */ | |
327 | sta->ampdu_mlme.dialog_token_allocator++; | |
328 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
329 | sta->ampdu_mlme.dialog_token_allocator; | |
330 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
331 | ||
c951ad35 | 332 | ieee80211_send_addba_request(sdata, pubsta->addr, tid, |
b8695a8f JB |
333 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, |
334 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
335 | 0x40, 5000); | |
736708bd | 336 | sta->ampdu_mlme.addba_req_num[tid]++; |
b8695a8f JB |
337 | /* activate the timer for the recipient's addBA response */ |
338 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
339 | jiffies + ADDBA_RESP_INTERVAL; | |
340 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
341 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
342 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
343 | #endif | |
c951ad35 | 344 | return 0; |
b8695a8f | 345 | |
96f5e66e | 346 | err_free: |
b8695a8f JB |
347 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
348 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
e4e72fb4 | 349 | err_wake_queue: |
cd8ffc80 JB |
350 | ieee80211_wake_queue_by_reason( |
351 | &local->hw, ieee80211_ac_from_tid(tid), | |
352 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
96f5e66e | 353 | err_unlock_sta: |
cd8ffc80 | 354 | spin_unlock(&local->ampdu_lock); |
b8695a8f | 355 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
356 | return ret; |
357 | } | |
358 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
359 | ||
cd8ffc80 JB |
360 | /* |
361 | * splice packets from the STA's pending to the local pending, | |
362 | * requires a call to ieee80211_agg_splice_finish and holding | |
363 | * local->ampdu_lock across both calls. | |
364 | */ | |
365 | static void ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
366 | struct sta_info *sta, u16 tid) | |
367 | { | |
368 | unsigned long flags; | |
369 | u16 queue = ieee80211_ac_from_tid(tid); | |
370 | ||
371 | ieee80211_stop_queue_by_reason( | |
372 | &local->hw, queue, | |
373 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
374 | ||
416fbdff LR |
375 | if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)) |
376 | return; | |
377 | ||
378 | if (WARN(!sta->ampdu_mlme.tid_tx[tid], | |
379 | "TID %d gone but expected when splicing aggregates from" | |
380 | "the pending queue\n", tid)) | |
381 | return; | |
382 | ||
cd8ffc80 JB |
383 | if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { |
384 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
cd8ffc80 JB |
385 | /* copy over remaining packets */ |
386 | skb_queue_splice_tail_init( | |
387 | &sta->ampdu_mlme.tid_tx[tid]->pending, | |
388 | &local->pending[queue]); | |
389 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
390 | } | |
391 | } | |
392 | ||
393 | static void ieee80211_agg_splice_finish(struct ieee80211_local *local, | |
394 | struct sta_info *sta, u16 tid) | |
395 | { | |
396 | u16 queue = ieee80211_ac_from_tid(tid); | |
397 | ||
398 | ieee80211_wake_queue_by_reason( | |
399 | &local->hw, queue, | |
400 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
401 | } | |
402 | ||
403 | /* caller must hold sta->lock */ | |
b1720231 JB |
404 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
405 | struct sta_info *sta, u16 tid) | |
406 | { | |
407 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
408 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
409 | #endif | |
410 | ||
cd8ffc80 JB |
411 | spin_lock(&local->ampdu_lock); |
412 | ieee80211_agg_splice_packets(local, sta, tid); | |
413 | /* | |
414 | * NB: we rely on sta->lock being taken in the TX | |
415 | * processing here when adding to the pending queue, | |
416 | * otherwise we could only change the state of the | |
417 | * session to OPERATIONAL _here_. | |
418 | */ | |
419 | ieee80211_agg_splice_finish(local, sta, tid); | |
420 | spin_unlock(&local->ampdu_lock); | |
b1720231 | 421 | |
12375ef9 | 422 | drv_ampdu_action(local, sta->sdata, |
c951ad35 | 423 | IEEE80211_AMPDU_TX_OPERATIONAL, |
24487981 | 424 | &sta->sta, tid, NULL); |
b1720231 JB |
425 | } |
426 | ||
c951ad35 | 427 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 428 | { |
c951ad35 JB |
429 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
430 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
431 | struct sta_info *sta; |
432 | u8 *state; | |
433 | ||
434 | if (tid >= STA_TID_NUM) { | |
435 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
436 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
437 | tid, STA_TID_NUM); | |
438 | #endif | |
439 | return; | |
440 | } | |
441 | ||
442 | rcu_read_lock(); | |
abe60632 | 443 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
444 | if (!sta) { |
445 | rcu_read_unlock(); | |
446 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
447 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
448 | #endif | |
449 | return; | |
450 | } | |
451 | ||
452 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
453 | spin_lock_bh(&sta->lock); | |
454 | ||
96f5e66e | 455 | if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
b8695a8f JB |
456 | #ifdef CONFIG_MAC80211_HT_DEBUG |
457 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
458 | *state); | |
459 | #endif | |
460 | spin_unlock_bh(&sta->lock); | |
461 | rcu_read_unlock(); | |
462 | return; | |
463 | } | |
464 | ||
96f5e66e JB |
465 | if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
466 | goto out; | |
b8695a8f JB |
467 | |
468 | *state |= HT_ADDBA_DRV_READY_MSK; | |
469 | ||
b1720231 JB |
470 | if (*state == HT_AGG_STATE_OPERATIONAL) |
471 | ieee80211_agg_tx_operational(local, sta, tid); | |
96f5e66e JB |
472 | |
473 | out: | |
b8695a8f JB |
474 | spin_unlock_bh(&sta->lock); |
475 | rcu_read_unlock(); | |
476 | } | |
477 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
478 | ||
c951ad35 | 479 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
480 | const u8 *ra, u16 tid) |
481 | { | |
c951ad35 JB |
482 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
483 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
484 | struct ieee80211_ra_tid *ra_tid; |
485 | struct sk_buff *skb = dev_alloc_skb(0); | |
486 | ||
487 | if (unlikely(!skb)) { | |
488 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
489 | if (net_ratelimit()) | |
490 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 491 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
492 | #endif |
493 | return; | |
494 | } | |
495 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
496 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
497 | ra_tid->tid = tid; | |
0bc6b187 | 498 | ra_tid->vif = vif; |
86ab6c5a JB |
499 | |
500 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
501 | skb_queue_tail(&local->skb_queue, skb); | |
502 | tasklet_schedule(&local->tasklet); | |
503 | } | |
504 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
505 | ||
849b7967 JB |
506 | int __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 | ||
849b7967 JB |
521 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
522 | ||
523 | unlock: | |
524 | spin_unlock_bh(&sta->lock); | |
525 | return ret; | |
526 | } | |
b8695a8f | 527 | |
c951ad35 | 528 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
b8695a8f JB |
529 | enum ieee80211_back_parties initiator) |
530 | { | |
c951ad35 JB |
531 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
532 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
533 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 534 | |
4253119a | 535 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
536 | return -EINVAL; |
537 | ||
b8695a8f JB |
538 | if (tid >= STA_TID_NUM) |
539 | return -EINVAL; | |
540 | ||
c951ad35 | 541 | return __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
542 | } |
543 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
544 | ||
c951ad35 | 545 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 546 | { |
c951ad35 JB |
547 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
548 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
549 | struct sta_info *sta; |
550 | u8 *state; | |
b8695a8f JB |
551 | |
552 | if (tid >= STA_TID_NUM) { | |
553 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
554 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
555 | tid, STA_TID_NUM); | |
556 | #endif | |
557 | return; | |
558 | } | |
559 | ||
560 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
561 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
562 | ra, tid); | |
563 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
564 | ||
565 | rcu_read_lock(); | |
abe60632 | 566 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
567 | if (!sta) { |
568 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
569 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
570 | #endif | |
571 | rcu_read_unlock(); | |
572 | return; | |
573 | } | |
574 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
575 | ||
576 | /* NOTE: no need to use sta->lock in this state check, as | |
577 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
578 | * pass through per sta/tid | |
579 | */ | |
580 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
581 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
582 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
583 | #endif | |
584 | rcu_read_unlock(); | |
585 | return; | |
586 | } | |
587 | ||
588 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
589 | ieee80211_send_delba(sta->sdata, ra, tid, | |
590 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
591 | ||
96f5e66e | 592 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 593 | spin_lock(&local->ampdu_lock); |
b8695a8f | 594 | |
cd8ffc80 | 595 | ieee80211_agg_splice_packets(local, sta, tid); |
96f5e66e | 596 | |
b8695a8f | 597 | *state = HT_AGG_STATE_IDLE; |
cd8ffc80 | 598 | /* from now on packets are no longer put onto sta->pending */ |
b8695a8f JB |
599 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
600 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
cd8ffc80 JB |
601 | |
602 | ieee80211_agg_splice_finish(local, sta, tid); | |
603 | ||
604 | spin_unlock(&local->ampdu_lock); | |
b8695a8f JB |
605 | spin_unlock_bh(&sta->lock); |
606 | ||
607 | rcu_read_unlock(); | |
608 | } | |
609 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
610 | ||
c951ad35 | 611 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
612 | const u8 *ra, u16 tid) |
613 | { | |
c951ad35 JB |
614 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
615 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
616 | struct ieee80211_ra_tid *ra_tid; |
617 | struct sk_buff *skb = dev_alloc_skb(0); | |
618 | ||
619 | if (unlikely(!skb)) { | |
620 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
621 | if (net_ratelimit()) | |
622 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 623 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
624 | #endif |
625 | return; | |
626 | } | |
627 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
628 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
629 | ra_tid->tid = tid; | |
0bc6b187 | 630 | ra_tid->vif = vif; |
b8695a8f JB |
631 | |
632 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
633 | skb_queue_tail(&local->skb_queue, skb); | |
634 | tasklet_schedule(&local->tasklet); | |
635 | } | |
636 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
637 | ||
86ab6c5a | 638 | |
b8695a8f JB |
639 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
640 | struct sta_info *sta, | |
641 | struct ieee80211_mgmt *mgmt, | |
642 | size_t len) | |
643 | { | |
b1720231 | 644 | u16 capab, tid; |
b8695a8f JB |
645 | u8 *state; |
646 | ||
647 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
648 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
649 | ||
650 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
651 | ||
652 | spin_lock_bh(&sta->lock); | |
653 | ||
2171abc5 | 654 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) |
8ade0082 | 655 | goto out; |
b8695a8f JB |
656 | |
657 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
658 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
b8695a8f JB |
659 | #ifdef CONFIG_MAC80211_HT_DEBUG |
660 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
661 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
8ade0082 | 662 | goto out; |
b8695a8f JB |
663 | } |
664 | ||
8ade0082 JB |
665 | del_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
666 | ||
b8695a8f JB |
667 | #ifdef CONFIG_MAC80211_HT_DEBUG |
668 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
669 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
2171abc5 | 670 | |
b8695a8f JB |
671 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
672 | == WLAN_STATUS_SUCCESS) { | |
96f5e66e JB |
673 | u8 curstate = *state; |
674 | ||
b8695a8f | 675 | *state |= HT_ADDBA_RECEIVED_MSK; |
b8695a8f | 676 | |
b1720231 JB |
677 | if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) |
678 | ieee80211_agg_tx_operational(local, sta, tid); | |
b8695a8f | 679 | |
b1720231 | 680 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 681 | } else { |
849b7967 | 682 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 683 | } |
2171abc5 | 684 | |
2171abc5 | 685 | out: |
849b7967 | 686 | spin_unlock_bh(&sta->lock); |
b8695a8f | 687 | } |