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> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
b8695a8f JB |
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> |
bc3b2d7f | 18 | #include <linux/export.h> |
b8695a8f JB |
19 | #include <net/mac80211.h> |
20 | #include "ieee80211_i.h" | |
24487981 | 21 | #include "driver-ops.h" |
b8695a8f JB |
22 | #include "wme.h" |
23 | ||
86ab6c5a | 24 | /** |
73a72a81 | 25 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
26 | * |
27 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
28 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
29 | * packets with a flag indicating A-MPDU aggregation. The driver | |
30 | * or device is responsible for actually aggregating the frames, | |
31 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 32 | * |
73a72a81 JB |
33 | * When TX aggregation is started by some subsystem (usually the rate |
34 | * control algorithm would be appropriate) by calling the | |
35 | * ieee80211_start_tx_ba_session() function, the driver will be | |
36 | * notified via its @ampdu_action function, with the | |
37 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
38 | * |
39 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
40 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
41 | * start the aggregation session after the peer has also responded. | |
42 | * If the peer responds negatively, the session will be stopped | |
43 | * again right away. Note that it is possible for the aggregation | |
44 | * session to be stopped before the driver has indicated that it | |
45 | * is done setting it up, in which case it must not indicate the | |
46 | * setup completion. | |
86ab6c5a | 47 | * |
73a72a81 JB |
48 | * Also note that, since we also need to wait for a response from |
49 | * the peer, the driver is notified of the completion of the | |
50 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
51 | * @ampdu_action callback. | |
52 | * | |
53 | * Similarly, when the aggregation session is stopped by the peer | |
54 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
55 | * @ampdu_action function will be called with the action | |
56 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
57 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
42624d49 YAP |
58 | * Note that the sta can get destroyed before the BA tear down is |
59 | * complete. | |
86ab6c5a JB |
60 | */ |
61 | ||
b8695a8f JB |
62 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
63 | const u8 *da, u16 tid, | |
64 | u8 dialog_token, u16 start_seq_num, | |
65 | u16 agg_size, u16 timeout) | |
66 | { | |
67 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
68 | struct sk_buff *skb; |
69 | struct ieee80211_mgmt *mgmt; | |
70 | u16 capab; | |
71 | ||
72 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
73 | ||
d15b8459 | 74 | if (!skb) |
b8695a8f | 75 | return; |
d15b8459 | 76 | |
b8695a8f JB |
77 | skb_reserve(skb, local->hw.extra_tx_headroom); |
78 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
79 | memset(mgmt, 0, 24); | |
80 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 81 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 82 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
83 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
84 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 85 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
86 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
87 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
13c40c54 AS |
88 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
89 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); | |
b8695a8f JB |
90 | |
91 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
92 | IEEE80211_STYPE_ACTION); | |
93 | ||
94 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
95 | ||
96 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
97 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
98 | ||
99 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
100 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
101 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
102 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
103 | ||
104 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
105 | ||
106 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
107 | mgmt->u.action.u.addba_req.start_seq_num = | |
108 | cpu_to_le16(start_seq_num << 4); | |
109 | ||
cf6bb79a | 110 | ieee80211_tx_skb_tid(sdata, skb, tid); |
b8695a8f JB |
111 | } |
112 | ||
8c771244 | 113 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 114 | { |
8c771244 | 115 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
116 | struct ieee80211_local *local = sdata->local; |
117 | struct sk_buff *skb; | |
118 | struct ieee80211_bar *bar; | |
119 | u16 bar_control = 0; | |
120 | ||
121 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 122 | if (!skb) |
b8695a8f | 123 | return; |
d15b8459 | 124 | |
b8695a8f JB |
125 | skb_reserve(skb, local->hw.extra_tx_headroom); |
126 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
127 | memset(bar, 0, sizeof(*bar)); | |
128 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
129 | IEEE80211_STYPE_BACK_REQ); | |
130 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 131 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
132 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
133 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 134 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
135 | bar->control = cpu_to_le16(bar_control); |
136 | bar->start_seq_num = cpu_to_le16(ssn); | |
137 | ||
2f7916f8 CL |
138 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
139 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
cf6bb79a | 140 | ieee80211_tx_skb_tid(sdata, skb, tid); |
b8695a8f | 141 | } |
8c771244 | 142 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 143 | |
ec034b20 JB |
144 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
145 | struct tid_ampdu_tx *tid_tx) | |
146 | { | |
147 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
148 | lockdep_assert_held(&sta->lock); | |
149 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
150 | } | |
151 | ||
30bf5f1f JB |
152 | static inline int ieee80211_ac_from_tid(int tid) |
153 | { | |
154 | return ieee802_1d_to_ac[tid & 7]; | |
155 | } | |
156 | ||
157 | /* | |
158 | * When multiple aggregation sessions on multiple stations | |
159 | * are being created/destroyed simultaneously, we need to | |
160 | * refcount the global queue stop caused by that in order | |
161 | * to not get into a situation where one of the aggregation | |
162 | * setup or teardown re-enables queues before the other is | |
163 | * ready to handle that. | |
164 | * | |
165 | * These two functions take care of this issue by keeping | |
166 | * a global "agg_queue_stop" refcount. | |
167 | */ | |
168 | static void __acquires(agg_queue) | |
169 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
170 | { | |
171 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
172 | ||
173 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) | |
174 | ieee80211_stop_queue_by_reason( | |
175 | &sdata->local->hw, queue, | |
176 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
177 | __acquire(agg_queue); | |
178 | } | |
179 | ||
180 | static void __releases(agg_queue) | |
181 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
182 | { | |
183 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
184 | ||
185 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) | |
186 | ieee80211_wake_queue_by_reason( | |
187 | &sdata->local->hw, queue, | |
188 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
189 | __release(agg_queue); | |
190 | } | |
191 | ||
192 | /* | |
193 | * splice packets from the STA's pending to the local pending, | |
194 | * requires a call to ieee80211_agg_splice_finish later | |
195 | */ | |
196 | static void __acquires(agg_queue) | |
197 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
198 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
199 | { | |
200 | struct ieee80211_local *local = sdata->local; | |
201 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
202 | unsigned long flags; | |
203 | ||
204 | ieee80211_stop_queue_agg(sdata, tid); | |
205 | ||
206 | if (WARN(!tid_tx, | |
207 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
208 | tid)) | |
209 | return; | |
210 | ||
211 | if (!skb_queue_empty(&tid_tx->pending)) { | |
212 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
213 | /* copy over remaining packets */ | |
214 | skb_queue_splice_tail_init(&tid_tx->pending, | |
215 | &local->pending[queue]); | |
216 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
217 | } | |
218 | } | |
219 | ||
220 | static void __releases(agg_queue) | |
221 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
222 | { | |
223 | ieee80211_wake_queue_agg(sdata, tid); | |
224 | } | |
225 | ||
226 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
227 | { | |
228 | struct tid_ampdu_tx *tid_tx; | |
229 | ||
230 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
231 | lockdep_assert_held(&sta->lock); | |
232 | ||
233 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
234 | ||
235 | /* | |
236 | * When we get here, the TX path will not be lockless any more wrt. | |
237 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
238 | * Thus it will block on getting the lock, if it occurs. So if we | |
239 | * stop the queue now, we will not get any more packets, and any | |
240 | * that might be being processed will wait for us here, thereby | |
241 | * guaranteeing that no packets go to the tid_tx pending queue any | |
242 | * more. | |
243 | */ | |
244 | ||
245 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
246 | ||
247 | /* future packets must not find the tid_tx struct any more */ | |
248 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
249 | ||
250 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
251 | ||
252 | kfree_rcu(tid_tx, rcu_head); | |
253 | } | |
254 | ||
67c282c0 | 255 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 256 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 257 | { |
849b7967 | 258 | struct ieee80211_local *local = sta->local; |
40b275b6 | 259 | struct tid_ampdu_tx *tid_tx; |
18b559d5 | 260 | enum ieee80211_ampdu_mlme_action action; |
23e6a7ea | 261 | int ret; |
a622ab72 | 262 | |
cfcdbde3 | 263 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 264 | |
18b559d5 JB |
265 | switch (reason) { |
266 | case AGG_STOP_DECLINED: | |
267 | case AGG_STOP_LOCAL_REQUEST: | |
268 | case AGG_STOP_PEER_REQUEST: | |
269 | action = IEEE80211_AMPDU_TX_STOP_CONT; | |
270 | break; | |
271 | case AGG_STOP_DESTROY_STA: | |
272 | action = IEEE80211_AMPDU_TX_STOP_FLUSH; | |
273 | break; | |
274 | default: | |
275 | WARN_ON_ONCE(1); | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
cfcdbde3 JB |
279 | spin_lock_bh(&sta->lock); |
280 | ||
40b275b6 JB |
281 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
282 | if (!tid_tx) { | |
283 | spin_unlock_bh(&sta->lock); | |
284 | return -ENOENT; | |
285 | } | |
286 | ||
18b559d5 JB |
287 | /* |
288 | * if we're already stopping ignore any new requests to stop | |
289 | * unless we're destroying it in which case notify the driver | |
290 | */ | |
24f50a9d JB |
291 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
292 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
293 | if (reason != AGG_STOP_DESTROY_STA) |
294 | return -EALREADY; | |
295 | ret = drv_ampdu_action(local, sta->sdata, | |
296 | IEEE80211_AMPDU_TX_STOP_FLUSH_CONT, | |
297 | &sta->sta, tid, NULL, 0); | |
298 | WARN_ON_ONCE(ret); | |
299 | goto remove_tid_tx; | |
24f50a9d JB |
300 | } |
301 | ||
0ab33703 JB |
302 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
303 | /* not even started yet! */ | |
ec034b20 | 304 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 305 | spin_unlock_bh(&sta->lock); |
0744371a | 306 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
307 | return 0; |
308 | } | |
309 | ||
24f50a9d JB |
310 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
311 | ||
cfcdbde3 JB |
312 | spin_unlock_bh(&sta->lock); |
313 | ||
bdcbd8e0 JB |
314 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
315 | sta->sta.addr, tid); | |
827d42c9 | 316 | |
44271488 | 317 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 318 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 319 | |
a622ab72 JB |
320 | /* |
321 | * After this packets are no longer handed right through | |
322 | * to the driver but are put onto tid_tx->pending instead, | |
323 | * with locking to ensure proper access. | |
324 | */ | |
325 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 326 | |
2a1e0fd1 EG |
327 | /* |
328 | * There might be a few packets being processed right now (on | |
329 | * another CPU) that have already gotten past the aggregation | |
330 | * check when it was still OPERATIONAL and consequently have | |
331 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
332 | * call into the driver at the same time or even before the | |
333 | * TX paths calls into it, which could confuse the driver. | |
334 | * | |
335 | * Wait for all currently running TX paths to finish before | |
336 | * telling the driver. New packets will not go through since | |
337 | * the aggregation session is no longer OPERATIONAL. | |
338 | */ | |
339 | synchronize_net(); | |
340 | ||
c82c4a80 JB |
341 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
342 | WLAN_BACK_RECIPIENT : | |
343 | WLAN_BACK_INITIATOR; | |
344 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 345 | |
18b559d5 | 346 | ret = drv_ampdu_action(local, sta->sdata, action, |
0b01f030 | 347 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
348 | |
349 | /* HW shall not deny going back to legacy */ | |
350 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
351 | /* |
352 | * We may have pending packets get stuck in this case... | |
353 | * Not bothering with a workaround for now. | |
354 | */ | |
23e6a7ea JB |
355 | } |
356 | ||
18b559d5 JB |
357 | if (reason == AGG_STOP_DESTROY_STA) { |
358 | remove_tid_tx: | |
359 | spin_lock_bh(&sta->lock); | |
360 | ieee80211_remove_tid_tx(sta, tid); | |
361 | spin_unlock_bh(&sta->lock); | |
362 | } | |
363 | ||
364 | return 0; | |
23e6a7ea JB |
365 | } |
366 | ||
b8695a8f JB |
367 | /* |
368 | * After sending add Block Ack request we activated a timer until | |
369 | * add Block Ack response will arrive from the recipient. | |
370 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
371 | */ | |
372 | static void sta_addba_resp_timer_expired(unsigned long data) | |
373 | { | |
374 | /* not an elegant detour, but there is no choice as the timer passes | |
375 | * only one argument, and both sta_info and TID are needed, so init | |
376 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
377 | * array gives the sta through container_of */ | |
378 | u16 tid = *(u8 *)data; | |
23e6a7ea | 379 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 380 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 381 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 382 | |
b8695a8f | 383 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
384 | rcu_read_lock(); |
385 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
386 | if (!tid_tx || |
387 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 388 | rcu_read_unlock(); |
bdcbd8e0 JB |
389 | ht_dbg(sta->sdata, |
390 | "timer expired on tid %d but we are not (or no longer) expecting addBA response there\n", | |
391 | tid); | |
23e6a7ea | 392 | return; |
b8695a8f JB |
393 | } |
394 | ||
bdcbd8e0 | 395 | ht_dbg(sta->sdata, "addBA response timer expired on tid %d\n", tid); |
b8695a8f | 396 | |
83a5cbf7 JB |
397 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
398 | rcu_read_unlock(); | |
b8695a8f JB |
399 | } |
400 | ||
67c282c0 | 401 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 402 | { |
40b275b6 | 403 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
404 | struct ieee80211_local *local = sta->local; |
405 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
406 | u16 start_seq_num; | |
407 | int ret; | |
408 | ||
40b275b6 | 409 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 410 | |
0ab33703 | 411 | /* |
15062e6a JB |
412 | * Start queuing up packets for this aggregation session. |
413 | * We're going to release them once the driver is OK with | |
414 | * that. | |
0ab33703 | 415 | */ |
0ab33703 JB |
416 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
417 | ||
418 | /* | |
15062e6a JB |
419 | * Make sure no packets are being processed. This ensures that |
420 | * we have a valid starting sequence number and that in-flight | |
421 | * packets have been flushed out and no packets for this TID | |
422 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 423 | */ |
cfcdbde3 JB |
424 | synchronize_net(); |
425 | ||
0ab33703 JB |
426 | start_seq_num = sta->tid_seq[tid] >> 4; |
427 | ||
428 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 429 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 | 430 | if (ret) { |
bdcbd8e0 JB |
431 | ht_dbg(sdata, |
432 | "BA request denied - HW unavailable for tid %d\n", tid); | |
cfcdbde3 | 433 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 434 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 435 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 436 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
437 | spin_unlock_bh(&sta->lock); |
438 | ||
0744371a | 439 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
440 | return; |
441 | } | |
442 | ||
0ab33703 JB |
443 | /* activate the timer for the recipient's addBA response */ |
444 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
bdcbd8e0 | 445 | ht_dbg(sdata, "activated addBA response timer on tid %d\n", tid); |
0ab33703 | 446 | |
cfcdbde3 | 447 | spin_lock_bh(&sta->lock); |
84381b4e | 448 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 449 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 450 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
451 | |
452 | /* send AddBA request */ | |
453 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
454 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
455 | local->hw.max_tx_aggregation_subframes, |
456 | tid_tx->timeout); | |
0ab33703 JB |
457 | } |
458 | ||
285fa695 NM |
459 | /* |
460 | * After accepting the AddBA Response we activated a timer, | |
461 | * resetting it after each frame that we send. | |
462 | */ | |
463 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
464 | { | |
465 | /* not an elegant detour, but there is no choice as the timer passes | |
466 | * only one argument, and various sta_info are needed here, so init | |
467 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
468 | * array gives the sta through container_of */ | |
469 | u8 *ptid = (u8 *)data; | |
470 | u8 *timer_to_id = ptid - *ptid; | |
471 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
472 | timer_to_tid[0]); | |
12d3952f FF |
473 | struct tid_ampdu_tx *tid_tx; |
474 | unsigned long timeout; | |
475 | ||
9e73dee7 JB |
476 | rcu_read_lock(); |
477 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
478 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
479 | rcu_read_unlock(); | |
12d3952f | 480 | return; |
9e73dee7 | 481 | } |
12d3952f FF |
482 | |
483 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
484 | if (time_is_after_jiffies(timeout)) { | |
485 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 486 | rcu_read_unlock(); |
12d3952f FF |
487 | return; |
488 | } | |
285fa695 | 489 | |
9e73dee7 JB |
490 | rcu_read_unlock(); |
491 | ||
bdcbd8e0 | 492 | ht_dbg(sta->sdata, "tx session timer expired on tid %d\n", (u16)*ptid); |
285fa695 NM |
493 | |
494 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
495 | } | |
496 | ||
bd2ce6e4 SM |
497 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
498 | u16 timeout) | |
b8695a8f | 499 | { |
c951ad35 JB |
500 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
501 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
502 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 503 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 504 | int ret = 0; |
b8695a8f | 505 | |
b5878a2d JB |
506 | trace_api_start_tx_ba_session(pubsta, tid); |
507 | ||
50c16e22 | 508 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
509 | return -EINVAL; |
510 | ||
5a306f58 | 511 | if ((tid >= IEEE80211_NUM_TIDS) || |
edf6b784 AN |
512 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
513 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
514 | return -EINVAL; |
515 | ||
bdcbd8e0 JB |
516 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
517 | pubsta->addr, tid); | |
b8695a8f | 518 | |
c951ad35 | 519 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 520 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 521 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
522 | sdata->vif.type != NL80211_IFTYPE_AP && |
523 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 524 | return -EINVAL; |
8abd3f9b | 525 | |
c2c98fde | 526 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 JB |
527 | ht_dbg(sdata, |
528 | "BA sessions blocked - Denying BA session request\n"); | |
c951ad35 | 529 | return -EINVAL; |
722f069a S |
530 | } |
531 | ||
ff3cc5f4 SW |
532 | /* |
533 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
534 | * member of an IBSS, and has no other existing Block Ack agreement | |
535 | * with the recipient STA, then the initiating STA shall transmit a | |
536 | * Probe Request frame to the recipient STA and shall not transmit an | |
537 | * ADDBA Request frame unless it receives a Probe Response frame | |
538 | * from the recipient within dot11ADDBAFailureTimeout. | |
539 | * | |
540 | * The probe request mechanism for ADDBA is currently not implemented, | |
541 | * but we only build up Block Ack session with HT STAs. This information | |
542 | * is set when we receive a bss info from a probe response or a beacon. | |
543 | */ | |
544 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
545 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
546 | ht_dbg(sdata, |
547 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
548 | pubsta->addr); | |
ff3cc5f4 SW |
549 | return -EINVAL; |
550 | } | |
551 | ||
b8695a8f JB |
552 | spin_lock_bh(&sta->lock); |
553 | ||
554 | /* we have tried too many times, receiver does not want A-MPDU */ | |
555 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
556 | ret = -EBUSY; | |
84381b4e NM |
557 | goto err_unlock_sta; |
558 | } | |
559 | ||
560 | /* | |
561 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
562 | * will spread our requests in time to avoid stalling connection | |
563 | * for too long | |
564 | */ | |
565 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
566 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
567 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 JB |
568 | ht_dbg(sdata, |
569 | "BA request denied - waiting a grace period after %d failed requests on tid %u\n", | |
570 | sta->ampdu_mlme.addba_req_num[tid], tid); | |
84381b4e | 571 | ret = -EBUSY; |
b8695a8f JB |
572 | goto err_unlock_sta; |
573 | } | |
574 | ||
40b275b6 | 575 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 576 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 577 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 JB |
578 | ht_dbg(sdata, |
579 | "BA request denied - session is not idle on tid %u\n", | |
580 | tid); | |
b8695a8f JB |
581 | ret = -EAGAIN; |
582 | goto err_unlock_sta; | |
583 | } | |
584 | ||
585 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
586 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
587 | if (!tid_tx) { | |
b8695a8f | 588 | ret = -ENOMEM; |
0ab33703 | 589 | goto err_unlock_sta; |
b8695a8f | 590 | } |
96f5e66e | 591 | |
a622ab72 | 592 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 593 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 594 | |
bd2ce6e4 SM |
595 | tid_tx->timeout = timeout; |
596 | ||
285fa695 | 597 | /* response timer */ |
a622ab72 JB |
598 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
599 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
600 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 601 | |
285fa695 NM |
602 | /* tx timer */ |
603 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
604 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 605 | init_timer_deferrable(&tid_tx->session_timer); |
285fa695 | 606 | |
0ab33703 | 607 | /* assign a dialog token */ |
b8695a8f | 608 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 609 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 610 | |
ec034b20 JB |
611 | /* |
612 | * Finally, assign it to the start array; the work item will | |
613 | * collect it and move it to the normal array. | |
614 | */ | |
615 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 616 | |
0ab33703 | 617 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 618 | |
0ab33703 | 619 | /* this flow continues off the work */ |
96f5e66e | 620 | err_unlock_sta: |
b8695a8f | 621 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
622 | return ret; |
623 | } | |
624 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
625 | ||
b1720231 JB |
626 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
627 | struct sta_info *sta, u16 tid) | |
628 | { | |
40b275b6 JB |
629 | struct tid_ampdu_tx *tid_tx; |
630 | ||
cfcdbde3 | 631 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 632 | |
40b275b6 JB |
633 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
634 | ||
bdcbd8e0 | 635 | ht_dbg(sta->sdata, "Aggregation is on for tid %d\n", tid); |
b1720231 | 636 | |
cfcdbde3 JB |
637 | drv_ampdu_action(local, sta->sdata, |
638 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 639 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
640 | |
641 | /* | |
642 | * synchronize with TX path, while splicing the TX path | |
643 | * should block so it won't put more packets onto pending. | |
644 | */ | |
645 | spin_lock_bh(&sta->lock); | |
646 | ||
3a25a8c8 | 647 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 648 | /* |
a622ab72 JB |
649 | * Now mark as operational. This will be visible |
650 | * in the TX path, and lets it go lock-free in | |
651 | * the common case. | |
cd8ffc80 | 652 | */ |
40b275b6 | 653 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 654 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 655 | |
cfcdbde3 | 656 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
657 | } |
658 | ||
c951ad35 | 659 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 660 | { |
c951ad35 JB |
661 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
662 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 663 | struct sta_info *sta; |
a622ab72 | 664 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 665 | |
b5878a2d JB |
666 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
667 | ||
5a306f58 | 668 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 669 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 670 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
671 | return; |
672 | } | |
673 | ||
cfcdbde3 | 674 | mutex_lock(&local->sta_mtx); |
bc192f89 | 675 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 676 | if (!sta) { |
cfcdbde3 | 677 | mutex_unlock(&local->sta_mtx); |
bdcbd8e0 | 678 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
b8695a8f JB |
679 | return; |
680 | } | |
681 | ||
cfcdbde3 | 682 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 683 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 684 | |
a622ab72 | 685 | if (WARN_ON(!tid_tx)) { |
bdcbd8e0 | 686 | ht_dbg(sdata, "addBA was not requested!\n"); |
cfcdbde3 | 687 | goto unlock; |
b8695a8f JB |
688 | } |
689 | ||
a622ab72 | 690 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 691 | goto unlock; |
b8695a8f | 692 | |
a622ab72 | 693 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 694 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 695 | |
cfcdbde3 JB |
696 | unlock: |
697 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
698 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 699 | } |
b8695a8f | 700 | |
c951ad35 | 701 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
702 | const u8 *ra, u16 tid) |
703 | { | |
c951ad35 JB |
704 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
705 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
706 | struct ieee80211_ra_tid *ra_tid; |
707 | struct sk_buff *skb = dev_alloc_skb(0); | |
708 | ||
d15b8459 | 709 | if (unlikely(!skb)) |
86ab6c5a | 710 | return; |
d15b8459 | 711 | |
86ab6c5a JB |
712 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
713 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
714 | ra_tid->tid = tid; | |
715 | ||
c1475ca9 JB |
716 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
717 | skb_queue_tail(&sdata->skb_queue, skb); | |
718 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
719 | } |
720 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
721 | ||
849b7967 | 722 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 723 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 724 | { |
849b7967 JB |
725 | int ret; |
726 | ||
cfcdbde3 | 727 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 728 | |
c82c4a80 | 729 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 730 | |
cfcdbde3 JB |
731 | mutex_unlock(&sta->ampdu_mlme.mtx); |
732 | ||
849b7967 JB |
733 | return ret; |
734 | } | |
b8695a8f | 735 | |
6a8579d0 | 736 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 737 | { |
c951ad35 JB |
738 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
739 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
740 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
741 | struct tid_ampdu_tx *tid_tx; |
742 | int ret = 0; | |
b8695a8f | 743 | |
6a8579d0 | 744 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 745 | |
4253119a | 746 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
747 | return -EINVAL; |
748 | ||
5a306f58 | 749 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
750 | return -EINVAL; |
751 | ||
0ab33703 | 752 | spin_lock_bh(&sta->lock); |
40b275b6 | 753 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
754 | |
755 | if (!tid_tx) { | |
756 | ret = -ENOENT; | |
757 | goto unlock; | |
758 | } | |
759 | ||
760 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
761 | /* already in progress stopping it */ | |
762 | ret = 0; | |
763 | goto unlock; | |
764 | } | |
765 | ||
766 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
767 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
768 | ||
769 | unlock: | |
770 | spin_unlock_bh(&sta->lock); | |
771 | return ret; | |
b8695a8f JB |
772 | } |
773 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
774 | ||
c951ad35 | 775 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 776 | { |
c951ad35 JB |
777 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
778 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 779 | struct sta_info *sta; |
a622ab72 | 780 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 781 | |
b5878a2d JB |
782 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
783 | ||
5a306f58 | 784 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 785 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 786 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
787 | return; |
788 | } | |
789 | ||
bdcbd8e0 | 790 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 791 | |
cfcdbde3 JB |
792 | mutex_lock(&local->sta_mtx); |
793 | ||
bc192f89 | 794 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 795 | if (!sta) { |
bdcbd8e0 | 796 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
cfcdbde3 | 797 | goto unlock; |
b8695a8f | 798 | } |
b8695a8f | 799 | |
cfcdbde3 | 800 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 801 | spin_lock_bh(&sta->lock); |
40b275b6 | 802 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
803 | |
804 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 805 | ht_dbg(sdata, "unexpected callback to A-MPDU stop\n"); |
cfcdbde3 | 806 | goto unlock_sta; |
b8695a8f JB |
807 | } |
808 | ||
53f73c09 | 809 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
810 | ieee80211_send_delba(sta->sdata, ra, tid, |
811 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
812 | ||
faec12ee | 813 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 814 | |
cfcdbde3 | 815 | unlock_sta: |
a622ab72 | 816 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
817 | mutex_unlock(&sta->ampdu_mlme.mtx); |
818 | unlock: | |
819 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 820 | } |
b8695a8f | 821 | |
c951ad35 | 822 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
823 | const u8 *ra, u16 tid) |
824 | { | |
c951ad35 JB |
825 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
826 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
827 | struct ieee80211_ra_tid *ra_tid; |
828 | struct sk_buff *skb = dev_alloc_skb(0); | |
829 | ||
d15b8459 | 830 | if (unlikely(!skb)) |
b8695a8f | 831 | return; |
d15b8459 | 832 | |
b8695a8f JB |
833 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
834 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
835 | ra_tid->tid = tid; | |
836 | ||
c1475ca9 JB |
837 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
838 | skb_queue_tail(&sdata->skb_queue, skb); | |
839 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
840 | } |
841 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
842 | ||
86ab6c5a | 843 | |
b8695a8f JB |
844 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
845 | struct sta_info *sta, | |
846 | struct ieee80211_mgmt *mgmt, | |
847 | size_t len) | |
848 | { | |
a622ab72 | 849 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 850 | u16 capab, tid; |
0b01f030 | 851 | u8 buf_size; |
b8695a8f JB |
852 | |
853 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
854 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 855 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 856 | |
cfcdbde3 | 857 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 858 | |
40b275b6 | 859 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 860 | if (!tid_tx) |
8ade0082 | 861 | goto out; |
b8695a8f | 862 | |
a622ab72 | 863 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
bdcbd8e0 | 864 | ht_dbg(sta->sdata, "wrong addBA response token, tid %d\n", tid); |
8ade0082 | 865 | goto out; |
b8695a8f JB |
866 | } |
867 | ||
d305a655 | 868 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 869 | |
bdcbd8e0 | 870 | ht_dbg(sta->sdata, "switched off addBA timer for tid %d\n", tid); |
d305a655 NM |
871 | |
872 | /* | |
873 | * addba_resp_timer may have fired before we got here, and | |
874 | * caused WANT_STOP to be set. If the stop then was already | |
875 | * processed further, STOPPING might be set. | |
876 | */ | |
877 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
878 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 JB |
879 | ht_dbg(sta->sdata, |
880 | "got addBA resp for tid %d but we already gave up\n", | |
881 | tid); | |
d305a655 NM |
882 | goto out; |
883 | } | |
884 | ||
3ca97880 HS |
885 | /* |
886 | * IEEE 802.11-2007 7.3.1.14: | |
887 | * In an ADDBA Response frame, when the Status Code field | |
888 | * is set to 0, the Buffer Size subfield is set to a value | |
889 | * of at least 1. | |
890 | */ | |
b8695a8f | 891 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 892 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
893 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
894 | &tid_tx->state)) { | |
895 | /* ignore duplicate response */ | |
896 | goto out; | |
897 | } | |
b8695a8f | 898 | |
0b01f030 JB |
899 | tid_tx->buf_size = buf_size; |
900 | ||
a622ab72 | 901 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 902 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 903 | |
b1720231 | 904 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 905 | |
12d3952f | 906 | if (tid_tx->timeout) { |
285fa695 NM |
907 | mod_timer(&tid_tx->session_timer, |
908 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
909 | tid_tx->last_tx = jiffies; |
910 | } | |
285fa695 | 911 | |
b8695a8f | 912 | } else { |
c82c4a80 | 913 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 914 | } |
2171abc5 | 915 | |
2171abc5 | 916 | out: |
cfcdbde3 | 917 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 918 | } |