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