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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
b8695a8f JB |
18 | #include <net/mac80211.h> |
19 | #include "ieee80211_i.h" | |
24487981 | 20 | #include "driver-ops.h" |
b8695a8f JB |
21 | #include "wme.h" |
22 | ||
86ab6c5a JB |
23 | /** |
24 | * DOC: TX aggregation | |
25 | * | |
26 | * Aggregation on the TX side requires setting the hardware flag | |
27 | * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues | |
28 | * hardware parameter to the number of hardware AMPDU queues. If there are no | |
29 | * hardware queues then the driver will (currently) have to do all frame | |
30 | * buffering. | |
31 | * | |
32 | * When TX aggregation is started by some subsystem (usually the rate control | |
33 | * algorithm would be appropriate) by calling the | |
34 | * ieee80211_start_tx_ba_session() function, the driver will be notified via | |
35 | * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. | |
36 | * | |
37 | * In response to that, the driver is later required to call the | |
38 | * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) | |
39 | * function, which will start the aggregation session. | |
40 | * | |
41 | * Similarly, when the aggregation session is stopped by | |
42 | * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will | |
43 | * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the | |
44 | * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() | |
45 | * (or ieee80211_stop_tx_ba_cb_irqsafe()). | |
46 | */ | |
47 | ||
b8695a8f JB |
48 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
49 | const u8 *da, u16 tid, | |
50 | u8 dialog_token, u16 start_seq_num, | |
51 | u16 agg_size, u16 timeout) | |
52 | { | |
53 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
54 | struct sk_buff *skb; |
55 | struct ieee80211_mgmt *mgmt; | |
56 | u16 capab; | |
57 | ||
58 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
59 | ||
60 | if (!skb) { | |
61 | printk(KERN_ERR "%s: failed to allocate buffer " | |
47846c9b | 62 | "for addba request frame\n", sdata->name); |
b8695a8f JB |
63 | return; |
64 | } | |
65 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
66 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
67 | memset(mgmt, 0, 24); | |
68 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 69 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
70 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
71 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 72 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
73 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
74 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
75 | |
76 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
77 | IEEE80211_STYPE_ACTION); | |
78 | ||
79 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
80 | ||
81 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
82 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
83 | ||
84 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
85 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
86 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
87 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
88 | ||
89 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
90 | ||
91 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
92 | mgmt->u.action.u.addba_req.start_seq_num = | |
93 | cpu_to_le16(start_seq_num << 4); | |
94 | ||
62ae67be | 95 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
96 | } |
97 | ||
98 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
99 | { | |
100 | struct ieee80211_local *local = sdata->local; | |
101 | struct sk_buff *skb; | |
102 | struct ieee80211_bar *bar; | |
103 | u16 bar_control = 0; | |
104 | ||
105 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
106 | if (!skb) { | |
107 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
47846c9b | 108 | "bar frame\n", sdata->name); |
b8695a8f JB |
109 | return; |
110 | } | |
111 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
112 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
113 | memset(bar, 0, sizeof(*bar)); | |
114 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
115 | IEEE80211_STYPE_BACK_REQ); | |
116 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 117 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
118 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
119 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
120 | bar_control |= (u16)(tid << 12); | |
121 | bar->control = cpu_to_le16(bar_control); | |
122 | bar->start_seq_num = cpu_to_le16(ssn); | |
123 | ||
62ae67be JB |
124 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
125 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f JB |
126 | } |
127 | ||
827d42c9 JB |
128 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
129 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 130 | { |
849b7967 | 131 | struct ieee80211_local *local = sta->local; |
23e6a7ea JB |
132 | int ret; |
133 | u8 *state; | |
134 | ||
827d42c9 JB |
135 | #ifdef CONFIG_MAC80211_HT_DEBUG |
136 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
137 | sta->sta.addr, tid); | |
138 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
139 | ||
23e6a7ea JB |
140 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
141 | ||
736708bd VT |
142 | if (*state == HT_AGG_STATE_OPERATIONAL) |
143 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
144 | ||
23e6a7ea JB |
145 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
146 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
147 | ||
12375ef9 | 148 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 149 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 150 | &sta->sta, tid, NULL); |
23e6a7ea JB |
151 | |
152 | /* HW shall not deny going back to legacy */ | |
153 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
154 | /* |
155 | * We may have pending packets get stuck in this case... | |
156 | * Not bothering with a workaround for now. | |
157 | */ | |
23e6a7ea JB |
158 | } |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
b8695a8f JB |
163 | /* |
164 | * After sending add Block Ack request we activated a timer until | |
165 | * add Block Ack response will arrive from the recipient. | |
166 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
167 | */ | |
168 | static void sta_addba_resp_timer_expired(unsigned long data) | |
169 | { | |
170 | /* not an elegant detour, but there is no choice as the timer passes | |
171 | * only one argument, and both sta_info and TID are needed, so init | |
172 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
173 | * array gives the sta through container_of */ | |
174 | u16 tid = *(u8 *)data; | |
23e6a7ea | 175 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 176 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
177 | u8 *state; |
178 | ||
b8695a8f | 179 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 180 | |
b8695a8f JB |
181 | /* check if the TID waits for addBA response */ |
182 | spin_lock_bh(&sta->lock); | |
3dc1de0b ZY |
183 | if ((*state & (HT_ADDBA_REQUESTED_MSK | HT_ADDBA_RECEIVED_MSK | |
184 | HT_AGG_STATE_REQ_STOP_BA_MSK)) != | |
8ade0082 | 185 | HT_ADDBA_REQUESTED_MSK) { |
b8695a8f | 186 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
187 | #ifdef CONFIG_MAC80211_HT_DEBUG |
188 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 189 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 190 | tid); |
b8695a8f | 191 | #endif |
23e6a7ea | 192 | return; |
b8695a8f JB |
193 | } |
194 | ||
195 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
196 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
197 | #endif | |
198 | ||
849b7967 | 199 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 200 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
201 | } |
202 | ||
96f5e66e JB |
203 | static inline int ieee80211_ac_from_tid(int tid) |
204 | { | |
205 | return ieee802_1d_to_ac[tid & 7]; | |
206 | } | |
207 | ||
c951ad35 | 208 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 209 | { |
c951ad35 JB |
210 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
211 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
212 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 213 | u8 *state; |
e4e72fb4 | 214 | int ret = 0; |
96f5e66e | 215 | u16 start_seq_num; |
b8695a8f | 216 | |
b5878a2d JB |
217 | trace_api_start_tx_ba_session(pubsta, tid); |
218 | ||
23e6a7ea JB |
219 | if (WARN_ON(!local->ops->ampdu_action)) |
220 | return -EINVAL; | |
221 | ||
c951ad35 JB |
222 | if ((tid >= STA_TID_NUM) || |
223 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
224 | return -EINVAL; |
225 | ||
226 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
227 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 228 | pubsta->addr, tid); |
b8695a8f JB |
229 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
230 | ||
8abd3f9b JB |
231 | /* |
232 | * The aggregation code is not prepared to handle | |
233 | * anything but STA/AP due to the BSSID handling. | |
234 | * IBSS could work in the code but isn't supported | |
235 | * by drivers or the standard. | |
236 | */ | |
c951ad35 JB |
237 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
238 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
239 | sdata->vif.type != NL80211_IFTYPE_AP) | |
240 | return -EINVAL; | |
8abd3f9b | 241 | |
4cad6c7c S |
242 | if (test_sta_flags(sta, WLAN_STA_DISASSOC)) { |
243 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
244 | printk(KERN_DEBUG "Disassociation is in progress. " | |
245 | "Denying BA session request\n"); | |
246 | #endif | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
618f356b | 250 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a S |
251 | #ifdef CONFIG_MAC80211_HT_DEBUG |
252 | printk(KERN_DEBUG "Suspend in progress. " | |
253 | "Denying BA session request\n"); | |
254 | #endif | |
c951ad35 | 255 | return -EINVAL; |
722f069a S |
256 | } |
257 | ||
b8695a8f | 258 | spin_lock_bh(&sta->lock); |
cd8ffc80 | 259 | spin_lock(&local->ampdu_lock); |
b8695a8f JB |
260 | |
261 | /* we have tried too many times, receiver does not want A-MPDU */ | |
262 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
263 | ret = -EBUSY; | |
264 | goto err_unlock_sta; | |
265 | } | |
266 | ||
267 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
268 | /* check if the TID is not in aggregation flow already */ | |
269 | if (*state != HT_AGG_STATE_IDLE) { | |
270 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
271 | printk(KERN_DEBUG "BA request denied - session is not " | |
272 | "idle on tid %u\n", tid); | |
273 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
274 | ret = -EAGAIN; | |
275 | goto err_unlock_sta; | |
276 | } | |
277 | ||
cd8ffc80 JB |
278 | /* |
279 | * While we're asking the driver about the aggregation, | |
280 | * stop the AC queue so that we don't have to worry | |
281 | * about frames that came in while we were doing that, | |
282 | * which would require us to put them to the AC pending | |
283 | * afterwards which just makes the code more complex. | |
284 | */ | |
285 | ieee80211_stop_queue_by_reason( | |
286 | &local->hw, ieee80211_ac_from_tid(tid), | |
287 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
288 | ||
b8695a8f JB |
289 | /* prepare A-MPDU MLME for Tx aggregation */ |
290 | sta->ampdu_mlme.tid_tx[tid] = | |
291 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
292 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
293 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
294 | if (net_ratelimit()) | |
295 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
296 | tid); | |
297 | #endif | |
298 | ret = -ENOMEM; | |
e4e72fb4 | 299 | goto err_wake_queue; |
b8695a8f | 300 | } |
96f5e66e | 301 | |
cd8ffc80 JB |
302 | skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); |
303 | ||
b8695a8f JB |
304 | /* Tx timer */ |
305 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
306 | sta_addba_resp_timer_expired; | |
307 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
308 | (unsigned long)&sta->timer_to_tid[tid]; | |
309 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
310 | ||
b8695a8f JB |
311 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
312 | * call back right away, it must see that the flow has begun */ | |
313 | *state |= HT_ADDBA_REQUESTED_MSK; | |
314 | ||
f3f66b69 | 315 | start_seq_num = sta->tid_seq[tid] >> 4; |
b8695a8f | 316 | |
12375ef9 | 317 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, |
c951ad35 | 318 | pubsta, tid, &start_seq_num); |
b8695a8f JB |
319 | |
320 | if (ret) { | |
b8695a8f JB |
321 | #ifdef CONFIG_MAC80211_HT_DEBUG |
322 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
323 | " tid %d\n", tid); | |
324 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
325 | *state = HT_AGG_STATE_IDLE; | |
96f5e66e | 326 | goto err_free; |
b8695a8f JB |
327 | } |
328 | ||
cd8ffc80 JB |
329 | /* Driver vetoed or OKed, but we can take packets again now */ |
330 | ieee80211_wake_queue_by_reason( | |
331 | &local->hw, ieee80211_ac_from_tid(tid), | |
332 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
333 | ||
334 | spin_unlock(&local->ampdu_lock); | |
b8695a8f | 335 | |
51a0d38d | 336 | /* prepare tid data */ |
b8695a8f JB |
337 | sta->ampdu_mlme.dialog_token_allocator++; |
338 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
339 | sta->ampdu_mlme.dialog_token_allocator; | |
340 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
341 | ||
51a0d38d JB |
342 | spin_unlock_bh(&sta->lock); |
343 | ||
344 | /* send AddBA request */ | |
c951ad35 | 345 | ieee80211_send_addba_request(sdata, pubsta->addr, tid, |
b8695a8f JB |
346 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, |
347 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
348 | 0x40, 5000); | |
736708bd | 349 | sta->ampdu_mlme.addba_req_num[tid]++; |
b8695a8f JB |
350 | /* activate the timer for the recipient's addBA response */ |
351 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
352 | jiffies + ADDBA_RESP_INTERVAL; | |
353 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
354 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
355 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
356 | #endif | |
c951ad35 | 357 | return 0; |
b8695a8f | 358 | |
96f5e66e | 359 | err_free: |
b8695a8f JB |
360 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
361 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
e4e72fb4 | 362 | err_wake_queue: |
cd8ffc80 JB |
363 | ieee80211_wake_queue_by_reason( |
364 | &local->hw, ieee80211_ac_from_tid(tid), | |
365 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
96f5e66e | 366 | err_unlock_sta: |
cd8ffc80 | 367 | spin_unlock(&local->ampdu_lock); |
b8695a8f | 368 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
369 | return ret; |
370 | } | |
371 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
372 | ||
cd8ffc80 JB |
373 | /* |
374 | * splice packets from the STA's pending to the local pending, | |
375 | * requires a call to ieee80211_agg_splice_finish and holding | |
376 | * local->ampdu_lock across both calls. | |
377 | */ | |
378 | static void ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
379 | struct sta_info *sta, u16 tid) | |
380 | { | |
381 | unsigned long flags; | |
382 | u16 queue = ieee80211_ac_from_tid(tid); | |
383 | ||
384 | ieee80211_stop_queue_by_reason( | |
385 | &local->hw, queue, | |
386 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
387 | ||
416fbdff LR |
388 | if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)) |
389 | return; | |
390 | ||
391 | if (WARN(!sta->ampdu_mlme.tid_tx[tid], | |
392 | "TID %d gone but expected when splicing aggregates from" | |
393 | "the pending queue\n", tid)) | |
394 | return; | |
395 | ||
cd8ffc80 JB |
396 | if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { |
397 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
cd8ffc80 JB |
398 | /* copy over remaining packets */ |
399 | skb_queue_splice_tail_init( | |
400 | &sta->ampdu_mlme.tid_tx[tid]->pending, | |
401 | &local->pending[queue]); | |
402 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
403 | } | |
404 | } | |
405 | ||
406 | static void ieee80211_agg_splice_finish(struct ieee80211_local *local, | |
407 | struct sta_info *sta, u16 tid) | |
408 | { | |
409 | u16 queue = ieee80211_ac_from_tid(tid); | |
410 | ||
411 | ieee80211_wake_queue_by_reason( | |
412 | &local->hw, queue, | |
413 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
414 | } | |
415 | ||
416 | /* caller must hold sta->lock */ | |
b1720231 JB |
417 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
418 | struct sta_info *sta, u16 tid) | |
419 | { | |
420 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
55f98938 | 421 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
422 | #endif |
423 | ||
cd8ffc80 JB |
424 | spin_lock(&local->ampdu_lock); |
425 | ieee80211_agg_splice_packets(local, sta, tid); | |
426 | /* | |
427 | * NB: we rely on sta->lock being taken in the TX | |
428 | * processing here when adding to the pending queue, | |
429 | * otherwise we could only change the state of the | |
430 | * session to OPERATIONAL _here_. | |
431 | */ | |
432 | ieee80211_agg_splice_finish(local, sta, tid); | |
433 | spin_unlock(&local->ampdu_lock); | |
b1720231 | 434 | |
12375ef9 | 435 | drv_ampdu_action(local, sta->sdata, |
c951ad35 | 436 | IEEE80211_AMPDU_TX_OPERATIONAL, |
24487981 | 437 | &sta->sta, tid, NULL); |
b1720231 JB |
438 | } |
439 | ||
c951ad35 | 440 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 441 | { |
c951ad35 JB |
442 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
443 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
444 | struct sta_info *sta; |
445 | u8 *state; | |
446 | ||
b5878a2d JB |
447 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
448 | ||
b8695a8f JB |
449 | if (tid >= STA_TID_NUM) { |
450 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
451 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
452 | tid, STA_TID_NUM); | |
453 | #endif | |
454 | return; | |
455 | } | |
456 | ||
457 | rcu_read_lock(); | |
abe60632 | 458 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
459 | if (!sta) { |
460 | rcu_read_unlock(); | |
461 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
462 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
463 | #endif | |
464 | return; | |
465 | } | |
466 | ||
467 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
468 | spin_lock_bh(&sta->lock); | |
469 | ||
96f5e66e | 470 | if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
b8695a8f JB |
471 | #ifdef CONFIG_MAC80211_HT_DEBUG |
472 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
473 | *state); | |
474 | #endif | |
475 | spin_unlock_bh(&sta->lock); | |
476 | rcu_read_unlock(); | |
477 | return; | |
478 | } | |
479 | ||
96f5e66e JB |
480 | if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
481 | goto out; | |
b8695a8f JB |
482 | |
483 | *state |= HT_ADDBA_DRV_READY_MSK; | |
484 | ||
b1720231 JB |
485 | if (*state == HT_AGG_STATE_OPERATIONAL) |
486 | ieee80211_agg_tx_operational(local, sta, tid); | |
96f5e66e JB |
487 | |
488 | out: | |
b8695a8f JB |
489 | spin_unlock_bh(&sta->lock); |
490 | rcu_read_unlock(); | |
491 | } | |
492 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
493 | ||
c951ad35 | 494 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
495 | const u8 *ra, u16 tid) |
496 | { | |
c951ad35 JB |
497 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
498 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
499 | struct ieee80211_ra_tid *ra_tid; |
500 | struct sk_buff *skb = dev_alloc_skb(0); | |
501 | ||
502 | if (unlikely(!skb)) { | |
503 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
504 | if (net_ratelimit()) | |
505 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 506 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
507 | #endif |
508 | return; | |
509 | } | |
510 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
511 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
512 | ra_tid->tid = tid; | |
0bc6b187 | 513 | ra_tid->vif = vif; |
86ab6c5a JB |
514 | |
515 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
516 | skb_queue_tail(&local->skb_queue, skb); | |
517 | tasklet_schedule(&local->tasklet); | |
518 | } | |
519 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
520 | ||
849b7967 JB |
521 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
522 | enum ieee80211_back_parties initiator) | |
523 | { | |
524 | u8 *state; | |
525 | int ret; | |
526 | ||
527 | /* check if the TID is in aggregation */ | |
528 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
529 | spin_lock_bh(&sta->lock); | |
530 | ||
531 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
532 | ret = -ENOENT; | |
533 | goto unlock; | |
534 | } | |
535 | ||
849b7967 JB |
536 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
537 | ||
538 | unlock: | |
539 | spin_unlock_bh(&sta->lock); | |
540 | return ret; | |
541 | } | |
b8695a8f | 542 | |
c951ad35 | 543 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
b8695a8f JB |
544 | enum ieee80211_back_parties initiator) |
545 | { | |
c951ad35 JB |
546 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
547 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
548 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 549 | |
b5878a2d JB |
550 | trace_api_stop_tx_ba_session(pubsta, tid, initiator); |
551 | ||
4253119a | 552 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
553 | return -EINVAL; |
554 | ||
b8695a8f JB |
555 | if (tid >= STA_TID_NUM) |
556 | return -EINVAL; | |
557 | ||
c951ad35 | 558 | return __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
559 | } |
560 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
561 | ||
c951ad35 | 562 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 563 | { |
c951ad35 JB |
564 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
565 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
566 | struct sta_info *sta; |
567 | u8 *state; | |
b8695a8f | 568 | |
b5878a2d JB |
569 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
570 | ||
b8695a8f JB |
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(); | |
abe60632 | 585 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
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 | ||
c951ad35 | 630 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
631 | const u8 *ra, u16 tid) |
632 | { | |
c951ad35 JB |
633 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
634 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
635 | struct ieee80211_ra_tid *ra_tid; |
636 | struct sk_buff *skb = dev_alloc_skb(0); | |
637 | ||
638 | if (unlikely(!skb)) { | |
639 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
640 | if (net_ratelimit()) | |
641 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 642 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
643 | #endif |
644 | return; | |
645 | } | |
646 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
647 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
648 | ra_tid->tid = tid; | |
0bc6b187 | 649 | ra_tid->vif = vif; |
b8695a8f JB |
650 | |
651 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
652 | skb_queue_tail(&local->skb_queue, skb); | |
653 | tasklet_schedule(&local->tasklet); | |
654 | } | |
655 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
656 | ||
86ab6c5a | 657 | |
b8695a8f JB |
658 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
659 | struct sta_info *sta, | |
660 | struct ieee80211_mgmt *mgmt, | |
661 | size_t len) | |
662 | { | |
b1720231 | 663 | u16 capab, tid; |
b8695a8f JB |
664 | u8 *state; |
665 | ||
666 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
667 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
668 | ||
669 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
670 | ||
671 | spin_lock_bh(&sta->lock); | |
672 | ||
2171abc5 | 673 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) |
8ade0082 | 674 | goto out; |
b8695a8f JB |
675 | |
676 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
677 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
b8695a8f JB |
678 | #ifdef CONFIG_MAC80211_HT_DEBUG |
679 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
680 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
8ade0082 | 681 | goto out; |
b8695a8f JB |
682 | } |
683 | ||
8ade0082 JB |
684 | del_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
685 | ||
b8695a8f | 686 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 687 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
b8695a8f | 688 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
2171abc5 | 689 | |
b8695a8f JB |
690 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
691 | == WLAN_STATUS_SUCCESS) { | |
96f5e66e JB |
692 | u8 curstate = *state; |
693 | ||
b8695a8f | 694 | *state |= HT_ADDBA_RECEIVED_MSK; |
b8695a8f | 695 | |
b1720231 JB |
696 | if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) |
697 | ieee80211_agg_tx_operational(local, sta, tid); | |
b8695a8f | 698 | |
b1720231 | 699 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 700 | } else { |
849b7967 | 701 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 702 | } |
2171abc5 | 703 | |
2171abc5 | 704 | out: |
849b7967 | 705 | spin_unlock_bh(&sta->lock); |
b8695a8f | 706 | } |