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> | |
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 | ||
c6e13327 | 110 | ieee80211_tx_skb(sdata, skb); |
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 | /* |
153 | * When multiple aggregation sessions on multiple stations | |
154 | * are being created/destroyed simultaneously, we need to | |
155 | * refcount the global queue stop caused by that in order | |
156 | * to not get into a situation where one of the aggregation | |
157 | * setup or teardown re-enables queues before the other is | |
158 | * ready to handle that. | |
159 | * | |
160 | * These two functions take care of this issue by keeping | |
161 | * a global "agg_queue_stop" refcount. | |
162 | */ | |
163 | static void __acquires(agg_queue) | |
164 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
165 | { | |
166 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
167 | ||
cca07b00 LC |
168 | /* we do refcounting here, so don't use the queue reason refcounting */ |
169 | ||
30bf5f1f JB |
170 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
171 | ieee80211_stop_queue_by_reason( | |
172 | &sdata->local->hw, queue, | |
cca07b00 LC |
173 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
174 | false); | |
30bf5f1f JB |
175 | __acquire(agg_queue); |
176 | } | |
177 | ||
178 | static void __releases(agg_queue) | |
179 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
180 | { | |
181 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
182 | ||
183 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) | |
184 | ieee80211_wake_queue_by_reason( | |
185 | &sdata->local->hw, queue, | |
cca07b00 LC |
186 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
187 | false); | |
30bf5f1f JB |
188 | __release(agg_queue); |
189 | } | |
190 | ||
191 | /* | |
192 | * splice packets from the STA's pending to the local pending, | |
193 | * requires a call to ieee80211_agg_splice_finish later | |
194 | */ | |
195 | static void __acquires(agg_queue) | |
196 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
197 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
198 | { | |
199 | struct ieee80211_local *local = sdata->local; | |
200 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
201 | unsigned long flags; | |
202 | ||
203 | ieee80211_stop_queue_agg(sdata, tid); | |
204 | ||
205 | if (WARN(!tid_tx, | |
206 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
207 | tid)) | |
208 | return; | |
209 | ||
210 | if (!skb_queue_empty(&tid_tx->pending)) { | |
211 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
212 | /* copy over remaining packets */ | |
213 | skb_queue_splice_tail_init(&tid_tx->pending, | |
214 | &local->pending[queue]); | |
215 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
216 | } | |
217 | } | |
218 | ||
219 | static void __releases(agg_queue) | |
220 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
221 | { | |
222 | ieee80211_wake_queue_agg(sdata, tid); | |
223 | } | |
224 | ||
225 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
226 | { | |
227 | struct tid_ampdu_tx *tid_tx; | |
228 | ||
229 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
230 | lockdep_assert_held(&sta->lock); | |
231 | ||
232 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
233 | ||
234 | /* | |
235 | * When we get here, the TX path will not be lockless any more wrt. | |
236 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
237 | * Thus it will block on getting the lock, if it occurs. So if we | |
238 | * stop the queue now, we will not get any more packets, and any | |
239 | * that might be being processed will wait for us here, thereby | |
240 | * guaranteeing that no packets go to the tid_tx pending queue any | |
241 | * more. | |
242 | */ | |
243 | ||
244 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
245 | ||
246 | /* future packets must not find the tid_tx struct any more */ | |
247 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
248 | ||
249 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
250 | ||
251 | kfree_rcu(tid_tx, rcu_head); | |
252 | } | |
253 | ||
67c282c0 | 254 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 255 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 256 | { |
849b7967 | 257 | struct ieee80211_local *local = sta->local; |
40b275b6 | 258 | struct tid_ampdu_tx *tid_tx; |
18b559d5 | 259 | enum ieee80211_ampdu_mlme_action action; |
23e6a7ea | 260 | int ret; |
a622ab72 | 261 | |
cfcdbde3 | 262 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 263 | |
18b559d5 JB |
264 | switch (reason) { |
265 | case AGG_STOP_DECLINED: | |
266 | case AGG_STOP_LOCAL_REQUEST: | |
267 | case AGG_STOP_PEER_REQUEST: | |
268 | action = IEEE80211_AMPDU_TX_STOP_CONT; | |
269 | break; | |
270 | case AGG_STOP_DESTROY_STA: | |
271 | action = IEEE80211_AMPDU_TX_STOP_FLUSH; | |
272 | break; | |
273 | default: | |
274 | WARN_ON_ONCE(1); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
cfcdbde3 JB |
278 | spin_lock_bh(&sta->lock); |
279 | ||
40b275b6 JB |
280 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
281 | if (!tid_tx) { | |
282 | spin_unlock_bh(&sta->lock); | |
283 | return -ENOENT; | |
284 | } | |
285 | ||
18b559d5 JB |
286 | /* |
287 | * if we're already stopping ignore any new requests to stop | |
288 | * unless we're destroying it in which case notify the driver | |
289 | */ | |
24f50a9d JB |
290 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
291 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
292 | if (reason != AGG_STOP_DESTROY_STA) |
293 | return -EALREADY; | |
294 | ret = drv_ampdu_action(local, sta->sdata, | |
295 | IEEE80211_AMPDU_TX_STOP_FLUSH_CONT, | |
296 | &sta->sta, tid, NULL, 0); | |
297 | WARN_ON_ONCE(ret); | |
8147dc7f | 298 | return 0; |
24f50a9d JB |
299 | } |
300 | ||
0ab33703 JB |
301 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
302 | /* not even started yet! */ | |
ec034b20 | 303 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 304 | spin_unlock_bh(&sta->lock); |
0744371a | 305 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
306 | return 0; |
307 | } | |
308 | ||
24f50a9d JB |
309 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
310 | ||
cfcdbde3 JB |
311 | spin_unlock_bh(&sta->lock); |
312 | ||
bdcbd8e0 JB |
313 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
314 | sta->sta.addr, tid); | |
827d42c9 | 315 | |
44271488 | 316 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 317 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 318 | |
a622ab72 JB |
319 | /* |
320 | * After this packets are no longer handed right through | |
321 | * to the driver but are put onto tid_tx->pending instead, | |
322 | * with locking to ensure proper access. | |
323 | */ | |
324 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 325 | |
2a1e0fd1 EG |
326 | /* |
327 | * There might be a few packets being processed right now (on | |
328 | * another CPU) that have already gotten past the aggregation | |
329 | * check when it was still OPERATIONAL and consequently have | |
330 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
331 | * call into the driver at the same time or even before the | |
332 | * TX paths calls into it, which could confuse the driver. | |
333 | * | |
334 | * Wait for all currently running TX paths to finish before | |
335 | * telling the driver. New packets will not go through since | |
336 | * the aggregation session is no longer OPERATIONAL. | |
337 | */ | |
338 | synchronize_net(); | |
339 | ||
c82c4a80 JB |
340 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
341 | WLAN_BACK_RECIPIENT : | |
342 | WLAN_BACK_INITIATOR; | |
343 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 344 | |
18b559d5 | 345 | ret = drv_ampdu_action(local, sta->sdata, action, |
0b01f030 | 346 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
347 | |
348 | /* HW shall not deny going back to legacy */ | |
349 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
350 | /* |
351 | * We may have pending packets get stuck in this case... | |
352 | * Not bothering with a workaround for now. | |
353 | */ | |
23e6a7ea JB |
354 | } |
355 | ||
8147dc7f JB |
356 | /* |
357 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
358 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
359 | * seem like we can leave the tid_tx data pending forever. | |
360 | * This is true, in a way, but "forever" is only until the | |
361 | * station struct is actually destroyed. In the meantime, | |
362 | * leaving it around ensures that we don't transmit packets | |
363 | * to the driver on this TID which might confuse it. | |
364 | */ | |
18b559d5 JB |
365 | |
366 | return 0; | |
23e6a7ea JB |
367 | } |
368 | ||
b8695a8f JB |
369 | /* |
370 | * After sending add Block Ack request we activated a timer until | |
371 | * add Block Ack response will arrive from the recipient. | |
372 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
373 | */ | |
374 | static void sta_addba_resp_timer_expired(unsigned long data) | |
375 | { | |
376 | /* not an elegant detour, but there is no choice as the timer passes | |
377 | * only one argument, and both sta_info and TID are needed, so init | |
378 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
379 | * array gives the sta through container_of */ | |
380 | u16 tid = *(u8 *)data; | |
23e6a7ea | 381 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 382 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 383 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 384 | |
b8695a8f | 385 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
386 | rcu_read_lock(); |
387 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
388 | if (!tid_tx || |
389 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 390 | rcu_read_unlock(); |
bdcbd8e0 | 391 | ht_dbg(sta->sdata, |
0a214d3f JB |
392 | "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n", |
393 | sta->sta.addr, tid); | |
23e6a7ea | 394 | return; |
b8695a8f JB |
395 | } |
396 | ||
0a214d3f JB |
397 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
398 | sta->sta.addr, tid); | |
b8695a8f | 399 | |
83a5cbf7 JB |
400 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
401 | rcu_read_unlock(); | |
b8695a8f JB |
402 | } |
403 | ||
67c282c0 | 404 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 405 | { |
40b275b6 | 406 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
407 | struct ieee80211_local *local = sta->local; |
408 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
409 | u16 start_seq_num; | |
410 | int ret; | |
411 | ||
40b275b6 | 412 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 413 | |
0ab33703 | 414 | /* |
15062e6a JB |
415 | * Start queuing up packets for this aggregation session. |
416 | * We're going to release them once the driver is OK with | |
417 | * that. | |
0ab33703 | 418 | */ |
0ab33703 JB |
419 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
420 | ||
421 | /* | |
15062e6a JB |
422 | * Make sure no packets are being processed. This ensures that |
423 | * we have a valid starting sequence number and that in-flight | |
424 | * packets have been flushed out and no packets for this TID | |
425 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 426 | */ |
cfcdbde3 JB |
427 | synchronize_net(); |
428 | ||
0ab33703 JB |
429 | start_seq_num = sta->tid_seq[tid] >> 4; |
430 | ||
431 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 432 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 | 433 | if (ret) { |
bdcbd8e0 | 434 | ht_dbg(sdata, |
0a214d3f JB |
435 | "BA request denied - HW unavailable for %pM tid %d\n", |
436 | sta->sta.addr, tid); | |
cfcdbde3 | 437 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 438 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 439 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 440 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
441 | spin_unlock_bh(&sta->lock); |
442 | ||
0744371a | 443 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
444 | return; |
445 | } | |
446 | ||
0ab33703 JB |
447 | /* activate the timer for the recipient's addBA response */ |
448 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
0a214d3f JB |
449 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
450 | sta->sta.addr, tid); | |
0ab33703 | 451 | |
cfcdbde3 | 452 | spin_lock_bh(&sta->lock); |
84381b4e | 453 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 454 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 455 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
456 | |
457 | /* send AddBA request */ | |
458 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
459 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
460 | local->hw.max_tx_aggregation_subframes, |
461 | tid_tx->timeout); | |
0ab33703 JB |
462 | } |
463 | ||
285fa695 NM |
464 | /* |
465 | * After accepting the AddBA Response we activated a timer, | |
466 | * resetting it after each frame that we send. | |
467 | */ | |
468 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
469 | { | |
470 | /* not an elegant detour, but there is no choice as the timer passes | |
471 | * only one argument, and various sta_info are needed here, so init | |
472 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
473 | * array gives the sta through container_of */ | |
474 | u8 *ptid = (u8 *)data; | |
475 | u8 *timer_to_id = ptid - *ptid; | |
476 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
477 | timer_to_tid[0]); | |
12d3952f FF |
478 | struct tid_ampdu_tx *tid_tx; |
479 | unsigned long timeout; | |
480 | ||
9e73dee7 JB |
481 | rcu_read_lock(); |
482 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
483 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
484 | rcu_read_unlock(); | |
12d3952f | 485 | return; |
9e73dee7 | 486 | } |
12d3952f FF |
487 | |
488 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
489 | if (time_is_after_jiffies(timeout)) { | |
490 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 491 | rcu_read_unlock(); |
12d3952f FF |
492 | return; |
493 | } | |
285fa695 | 494 | |
9e73dee7 JB |
495 | rcu_read_unlock(); |
496 | ||
0a214d3f JB |
497 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
498 | sta->sta.addr, (u16)*ptid); | |
285fa695 NM |
499 | |
500 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
501 | } | |
502 | ||
bd2ce6e4 SM |
503 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
504 | u16 timeout) | |
b8695a8f | 505 | { |
c951ad35 JB |
506 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
507 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
508 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 509 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 510 | int ret = 0; |
b8695a8f | 511 | |
b6da911b LK |
512 | if (WARN(sta->reserved_tid == tid, |
513 | "Requested to start BA session on reserved tid=%d", tid)) | |
514 | return -EINVAL; | |
515 | ||
b5878a2d JB |
516 | trace_api_start_tx_ba_session(pubsta, tid); |
517 | ||
50c16e22 | 518 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
519 | return -EINVAL; |
520 | ||
5a306f58 | 521 | if ((tid >= IEEE80211_NUM_TIDS) || |
edf6b784 AN |
522 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
523 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
524 | return -EINVAL; |
525 | ||
bdcbd8e0 JB |
526 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
527 | pubsta->addr, tid); | |
b8695a8f | 528 | |
c951ad35 | 529 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 530 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 531 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
532 | sdata->vif.type != NL80211_IFTYPE_AP && |
533 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 534 | return -EINVAL; |
8abd3f9b | 535 | |
c2c98fde | 536 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 537 | ht_dbg(sdata, |
0a214d3f JB |
538 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
539 | sta->sta.addr, tid); | |
c951ad35 | 540 | return -EINVAL; |
722f069a S |
541 | } |
542 | ||
ff3cc5f4 SW |
543 | /* |
544 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
545 | * member of an IBSS, and has no other existing Block Ack agreement | |
546 | * with the recipient STA, then the initiating STA shall transmit a | |
547 | * Probe Request frame to the recipient STA and shall not transmit an | |
548 | * ADDBA Request frame unless it receives a Probe Response frame | |
549 | * from the recipient within dot11ADDBAFailureTimeout. | |
550 | * | |
551 | * The probe request mechanism for ADDBA is currently not implemented, | |
552 | * but we only build up Block Ack session with HT STAs. This information | |
553 | * is set when we receive a bss info from a probe response or a beacon. | |
554 | */ | |
555 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
556 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
557 | ht_dbg(sdata, |
558 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
559 | pubsta->addr); | |
ff3cc5f4 SW |
560 | return -EINVAL; |
561 | } | |
562 | ||
b8695a8f JB |
563 | spin_lock_bh(&sta->lock); |
564 | ||
565 | /* we have tried too many times, receiver does not want A-MPDU */ | |
566 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
567 | ret = -EBUSY; | |
84381b4e NM |
568 | goto err_unlock_sta; |
569 | } | |
570 | ||
571 | /* | |
572 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
573 | * will spread our requests in time to avoid stalling connection | |
574 | * for too long | |
575 | */ | |
576 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
577 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
578 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 579 | ht_dbg(sdata, |
0a214d3f JB |
580 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
581 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); | |
84381b4e | 582 | ret = -EBUSY; |
b8695a8f JB |
583 | goto err_unlock_sta; |
584 | } | |
585 | ||
40b275b6 | 586 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 587 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 588 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 589 | ht_dbg(sdata, |
0a214d3f JB |
590 | "BA request denied - session is not idle on %pM tid %u\n", |
591 | sta->sta.addr, tid); | |
b8695a8f JB |
592 | ret = -EAGAIN; |
593 | goto err_unlock_sta; | |
594 | } | |
595 | ||
596 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
597 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
598 | if (!tid_tx) { | |
b8695a8f | 599 | ret = -ENOMEM; |
0ab33703 | 600 | goto err_unlock_sta; |
b8695a8f | 601 | } |
96f5e66e | 602 | |
a622ab72 | 603 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 604 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 605 | |
bd2ce6e4 SM |
606 | tid_tx->timeout = timeout; |
607 | ||
285fa695 | 608 | /* response timer */ |
a622ab72 JB |
609 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
610 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
611 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 612 | |
285fa695 NM |
613 | /* tx timer */ |
614 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
615 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 616 | init_timer_deferrable(&tid_tx->session_timer); |
285fa695 | 617 | |
0ab33703 | 618 | /* assign a dialog token */ |
b8695a8f | 619 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 620 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 621 | |
ec034b20 JB |
622 | /* |
623 | * Finally, assign it to the start array; the work item will | |
624 | * collect it and move it to the normal array. | |
625 | */ | |
626 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 627 | |
0ab33703 | 628 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 629 | |
0ab33703 | 630 | /* this flow continues off the work */ |
96f5e66e | 631 | err_unlock_sta: |
b8695a8f | 632 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
633 | return ret; |
634 | } | |
635 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
636 | ||
b1720231 JB |
637 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
638 | struct sta_info *sta, u16 tid) | |
639 | { | |
40b275b6 JB |
640 | struct tid_ampdu_tx *tid_tx; |
641 | ||
cfcdbde3 | 642 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 643 | |
40b275b6 JB |
644 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
645 | ||
0a214d3f JB |
646 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
647 | sta->sta.addr, tid); | |
b1720231 | 648 | |
cfcdbde3 JB |
649 | drv_ampdu_action(local, sta->sdata, |
650 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 651 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
652 | |
653 | /* | |
654 | * synchronize with TX path, while splicing the TX path | |
655 | * should block so it won't put more packets onto pending. | |
656 | */ | |
657 | spin_lock_bh(&sta->lock); | |
658 | ||
3a25a8c8 | 659 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 660 | /* |
a622ab72 JB |
661 | * Now mark as operational. This will be visible |
662 | * in the TX path, and lets it go lock-free in | |
663 | * the common case. | |
cd8ffc80 | 664 | */ |
40b275b6 | 665 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 666 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 667 | |
cfcdbde3 | 668 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
669 | } |
670 | ||
c951ad35 | 671 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 672 | { |
c951ad35 JB |
673 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
674 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 675 | struct sta_info *sta; |
a622ab72 | 676 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 677 | |
b5878a2d JB |
678 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
679 | ||
5a306f58 | 680 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 681 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 682 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
683 | return; |
684 | } | |
685 | ||
cfcdbde3 | 686 | mutex_lock(&local->sta_mtx); |
bc192f89 | 687 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 688 | if (!sta) { |
cfcdbde3 | 689 | mutex_unlock(&local->sta_mtx); |
bdcbd8e0 | 690 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
b8695a8f JB |
691 | return; |
692 | } | |
693 | ||
cfcdbde3 | 694 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 695 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 696 | |
a622ab72 | 697 | if (WARN_ON(!tid_tx)) { |
bdcbd8e0 | 698 | ht_dbg(sdata, "addBA was not requested!\n"); |
cfcdbde3 | 699 | goto unlock; |
b8695a8f JB |
700 | } |
701 | ||
a622ab72 | 702 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 703 | goto unlock; |
b8695a8f | 704 | |
a622ab72 | 705 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 706 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 707 | |
cfcdbde3 JB |
708 | unlock: |
709 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
710 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 711 | } |
b8695a8f | 712 | |
c951ad35 | 713 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
714 | const u8 *ra, u16 tid) |
715 | { | |
c951ad35 JB |
716 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
717 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
718 | struct ieee80211_ra_tid *ra_tid; |
719 | struct sk_buff *skb = dev_alloc_skb(0); | |
720 | ||
d15b8459 | 721 | if (unlikely(!skb)) |
86ab6c5a | 722 | return; |
d15b8459 | 723 | |
86ab6c5a JB |
724 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
725 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
726 | ra_tid->tid = tid; | |
727 | ||
c1475ca9 JB |
728 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
729 | skb_queue_tail(&sdata->skb_queue, skb); | |
730 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
731 | } |
732 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
733 | ||
849b7967 | 734 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 735 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 736 | { |
849b7967 JB |
737 | int ret; |
738 | ||
cfcdbde3 | 739 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 740 | |
c82c4a80 | 741 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 742 | |
cfcdbde3 JB |
743 | mutex_unlock(&sta->ampdu_mlme.mtx); |
744 | ||
849b7967 JB |
745 | return ret; |
746 | } | |
b8695a8f | 747 | |
6a8579d0 | 748 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 749 | { |
c951ad35 JB |
750 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
751 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
752 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
753 | struct tid_ampdu_tx *tid_tx; |
754 | int ret = 0; | |
b8695a8f | 755 | |
6a8579d0 | 756 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 757 | |
4253119a | 758 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
759 | return -EINVAL; |
760 | ||
5a306f58 | 761 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
762 | return -EINVAL; |
763 | ||
0ab33703 | 764 | spin_lock_bh(&sta->lock); |
40b275b6 | 765 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
766 | |
767 | if (!tid_tx) { | |
768 | ret = -ENOENT; | |
769 | goto unlock; | |
770 | } | |
771 | ||
b6da911b LK |
772 | WARN(sta->reserved_tid == tid, |
773 | "Requested to stop BA session on reserved tid=%d", tid); | |
774 | ||
0ab33703 JB |
775 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
776 | /* already in progress stopping it */ | |
777 | ret = 0; | |
778 | goto unlock; | |
779 | } | |
780 | ||
781 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
782 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
783 | ||
784 | unlock: | |
785 | spin_unlock_bh(&sta->lock); | |
786 | return ret; | |
b8695a8f JB |
787 | } |
788 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
789 | ||
c951ad35 | 790 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 791 | { |
c951ad35 JB |
792 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
793 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 794 | struct sta_info *sta; |
a622ab72 | 795 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 796 | |
b5878a2d JB |
797 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
798 | ||
5a306f58 | 799 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 800 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 801 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
802 | return; |
803 | } | |
804 | ||
bdcbd8e0 | 805 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 806 | |
cfcdbde3 JB |
807 | mutex_lock(&local->sta_mtx); |
808 | ||
bc192f89 | 809 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 810 | if (!sta) { |
bdcbd8e0 | 811 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
cfcdbde3 | 812 | goto unlock; |
b8695a8f | 813 | } |
b8695a8f | 814 | |
cfcdbde3 | 815 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 816 | spin_lock_bh(&sta->lock); |
40b275b6 | 817 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
818 | |
819 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
0a214d3f JB |
820 | ht_dbg(sdata, |
821 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
822 | sta->sta.addr, tid); | |
cfcdbde3 | 823 | goto unlock_sta; |
b8695a8f JB |
824 | } |
825 | ||
53f73c09 | 826 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
827 | ieee80211_send_delba(sta->sdata, ra, tid, |
828 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
829 | ||
faec12ee | 830 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 831 | |
cfcdbde3 | 832 | unlock_sta: |
a622ab72 | 833 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
834 | mutex_unlock(&sta->ampdu_mlme.mtx); |
835 | unlock: | |
836 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 837 | } |
b8695a8f | 838 | |
c951ad35 | 839 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
840 | const u8 *ra, u16 tid) |
841 | { | |
c951ad35 JB |
842 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
843 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
844 | struct ieee80211_ra_tid *ra_tid; |
845 | struct sk_buff *skb = dev_alloc_skb(0); | |
846 | ||
d15b8459 | 847 | if (unlikely(!skb)) |
b8695a8f | 848 | return; |
d15b8459 | 849 | |
b8695a8f JB |
850 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
851 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
852 | ra_tid->tid = tid; | |
853 | ||
c1475ca9 JB |
854 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
855 | skb_queue_tail(&sdata->skb_queue, skb); | |
856 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
857 | } |
858 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
859 | ||
86ab6c5a | 860 | |
b8695a8f JB |
861 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
862 | struct sta_info *sta, | |
863 | struct ieee80211_mgmt *mgmt, | |
864 | size_t len) | |
865 | { | |
a622ab72 | 866 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 867 | u16 capab, tid; |
0b01f030 | 868 | u8 buf_size; |
b8695a8f JB |
869 | |
870 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
871 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 872 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 873 | |
cfcdbde3 | 874 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 875 | |
40b275b6 | 876 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 877 | if (!tid_tx) |
8ade0082 | 878 | goto out; |
b8695a8f | 879 | |
a622ab72 | 880 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
881 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
882 | sta->sta.addr, tid); | |
8ade0082 | 883 | goto out; |
b8695a8f JB |
884 | } |
885 | ||
d305a655 | 886 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 887 | |
0a214d3f JB |
888 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
889 | sta->sta.addr, tid); | |
d305a655 NM |
890 | |
891 | /* | |
892 | * addba_resp_timer may have fired before we got here, and | |
893 | * caused WANT_STOP to be set. If the stop then was already | |
894 | * processed further, STOPPING might be set. | |
895 | */ | |
896 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
897 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 898 | ht_dbg(sta->sdata, |
0a214d3f JB |
899 | "got addBA resp for %pM tid %d but we already gave up\n", |
900 | sta->sta.addr, tid); | |
d305a655 NM |
901 | goto out; |
902 | } | |
903 | ||
3ca97880 HS |
904 | /* |
905 | * IEEE 802.11-2007 7.3.1.14: | |
906 | * In an ADDBA Response frame, when the Status Code field | |
907 | * is set to 0, the Buffer Size subfield is set to a value | |
908 | * of at least 1. | |
909 | */ | |
b8695a8f | 910 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 911 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
912 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
913 | &tid_tx->state)) { | |
914 | /* ignore duplicate response */ | |
915 | goto out; | |
916 | } | |
b8695a8f | 917 | |
0b01f030 JB |
918 | tid_tx->buf_size = buf_size; |
919 | ||
a622ab72 | 920 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 921 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 922 | |
b1720231 | 923 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 924 | |
12d3952f | 925 | if (tid_tx->timeout) { |
285fa695 NM |
926 | mod_timer(&tid_tx->session_timer, |
927 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
928 | tid_tx->last_tx = jiffies; |
929 | } | |
285fa695 | 930 | |
b8695a8f | 931 | } else { |
c82c4a80 | 932 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 933 | } |
2171abc5 | 934 | |
2171abc5 | 935 | out: |
cfcdbde3 | 936 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 937 | } |