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Commit | Line | Data |
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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
7a7c0a64 | 10 | * Copyright(c) 2015-2017 Intel Deutschland GmbH |
b8695a8f JB |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bc3b2d7f | 19 | #include <linux/export.h> |
b8695a8f JB |
20 | #include <net/mac80211.h> |
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
b8695a8f JB |
23 | #include "wme.h" |
24 | ||
86ab6c5a | 25 | /** |
73a72a81 | 26 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
27 | * |
28 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
29 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
30 | * packets with a flag indicating A-MPDU aggregation. The driver | |
31 | * or device is responsible for actually aggregating the frames, | |
32 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 33 | * |
73a72a81 JB |
34 | * When TX aggregation is started by some subsystem (usually the rate |
35 | * control algorithm would be appropriate) by calling the | |
36 | * ieee80211_start_tx_ba_session() function, the driver will be | |
37 | * notified via its @ampdu_action function, with the | |
38 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
39 | * |
40 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
41 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
42 | * start the aggregation session after the peer has also responded. | |
43 | * If the peer responds negatively, the session will be stopped | |
44 | * again right away. Note that it is possible for the aggregation | |
45 | * session to be stopped before the driver has indicated that it | |
46 | * is done setting it up, in which case it must not indicate the | |
47 | * setup completion. | |
86ab6c5a | 48 | * |
73a72a81 JB |
49 | * Also note that, since we also need to wait for a response from |
50 | * the peer, the driver is notified of the completion of the | |
51 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
52 | * @ampdu_action callback. | |
53 | * | |
54 | * Similarly, when the aggregation session is stopped by the peer | |
55 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
56 | * @ampdu_action function will be called with the action | |
57 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
58 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
42624d49 YAP |
59 | * Note that the sta can get destroyed before the BA tear down is |
60 | * complete. | |
86ab6c5a JB |
61 | */ |
62 | ||
b8695a8f JB |
63 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
64 | const u8 *da, u16 tid, | |
65 | u8 dialog_token, u16 start_seq_num, | |
66 | u16 agg_size, u16 timeout) | |
67 | { | |
68 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
69 | struct sk_buff *skb; |
70 | struct ieee80211_mgmt *mgmt; | |
71 | u16 capab; | |
72 | ||
73 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
74 | ||
d15b8459 | 75 | if (!skb) |
b8695a8f | 76 | return; |
d15b8459 | 77 | |
b8695a8f | 78 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 79 | mgmt = skb_put_zero(skb, 24); |
b8695a8f | 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; | |
e3abc8ff EG |
100 | capab = (u16)(1 << 0); /* bit 0 A-MSDU support */ |
101 | capab |= (u16)(1 << 1); /* bit 1 aggregation policy */ | |
b8695a8f JB |
102 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
103 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
104 | ||
105 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
106 | ||
107 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
108 | mgmt->u.action.u.addba_req.start_seq_num = | |
109 | cpu_to_le16(start_seq_num << 4); | |
110 | ||
c6e13327 | 111 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
112 | } |
113 | ||
8c771244 | 114 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 115 | { |
8c771244 | 116 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
117 | struct ieee80211_local *local = sdata->local; |
118 | struct sk_buff *skb; | |
119 | struct ieee80211_bar *bar; | |
120 | u16 bar_control = 0; | |
121 | ||
122 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 123 | if (!skb) |
b8695a8f | 124 | return; |
d15b8459 | 125 | |
b8695a8f | 126 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 127 | bar = skb_put_zero(skb, sizeof(*bar)); |
b8695a8f JB |
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 | ||
ba8c3d6f FF |
191 | static void |
192 | ieee80211_agg_stop_txq(struct sta_info *sta, int tid) | |
193 | { | |
194 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
fa962b92 MK |
195 | struct ieee80211_sub_if_data *sdata; |
196 | struct fq *fq; | |
ba8c3d6f FF |
197 | struct txq_info *txqi; |
198 | ||
199 | if (!txq) | |
200 | return; | |
201 | ||
202 | txqi = to_txq_info(txq); | |
fa962b92 MK |
203 | sdata = vif_to_sdata(txq->vif); |
204 | fq = &sdata->local->fq; | |
ba8c3d6f FF |
205 | |
206 | /* Lock here to protect against further seqno updates on dequeue */ | |
fa962b92 | 207 | spin_lock_bh(&fq->lock); |
ba8c3d6f | 208 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
fa962b92 | 209 | spin_unlock_bh(&fq->lock); |
ba8c3d6f FF |
210 | } |
211 | ||
212 | static void | |
213 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) | |
214 | { | |
215 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
216 | struct txq_info *txqi; | |
217 | ||
218 | if (!txq) | |
219 | return; | |
220 | ||
221 | txqi = to_txq_info(txq); | |
222 | ||
223 | if (enable) | |
224 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
225 | else | |
226 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
227 | ||
228 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
229 | drv_wake_tx_queue(sta->sdata->local, txqi); | |
230 | } | |
231 | ||
30bf5f1f JB |
232 | /* |
233 | * splice packets from the STA's pending to the local pending, | |
234 | * requires a call to ieee80211_agg_splice_finish later | |
235 | */ | |
236 | static void __acquires(agg_queue) | |
237 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
238 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
239 | { | |
240 | struct ieee80211_local *local = sdata->local; | |
241 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
242 | unsigned long flags; | |
243 | ||
244 | ieee80211_stop_queue_agg(sdata, tid); | |
245 | ||
246 | if (WARN(!tid_tx, | |
247 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
248 | tid)) | |
249 | return; | |
250 | ||
251 | if (!skb_queue_empty(&tid_tx->pending)) { | |
252 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
253 | /* copy over remaining packets */ | |
254 | skb_queue_splice_tail_init(&tid_tx->pending, | |
255 | &local->pending[queue]); | |
256 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
257 | } | |
258 | } | |
259 | ||
260 | static void __releases(agg_queue) | |
261 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
262 | { | |
263 | ieee80211_wake_queue_agg(sdata, tid); | |
264 | } | |
265 | ||
266 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
267 | { | |
268 | struct tid_ampdu_tx *tid_tx; | |
269 | ||
270 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
271 | lockdep_assert_held(&sta->lock); | |
272 | ||
273 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
274 | ||
275 | /* | |
276 | * When we get here, the TX path will not be lockless any more wrt. | |
277 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
278 | * Thus it will block on getting the lock, if it occurs. So if we | |
279 | * stop the queue now, we will not get any more packets, and any | |
280 | * that might be being processed will wait for us here, thereby | |
281 | * guaranteeing that no packets go to the tid_tx pending queue any | |
282 | * more. | |
283 | */ | |
284 | ||
285 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
286 | ||
287 | /* future packets must not find the tid_tx struct any more */ | |
288 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
289 | ||
290 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
ba8c3d6f | 291 | ieee80211_agg_start_txq(sta, tid, false); |
30bf5f1f JB |
292 | |
293 | kfree_rcu(tid_tx, rcu_head); | |
294 | } | |
295 | ||
67c282c0 | 296 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 297 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 298 | { |
849b7967 | 299 | struct ieee80211_local *local = sta->local; |
40b275b6 | 300 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
301 | struct ieee80211_ampdu_params params = { |
302 | .sta = &sta->sta, | |
303 | .tid = tid, | |
304 | .buf_size = 0, | |
305 | .amsdu = false, | |
306 | .timeout = 0, | |
307 | .ssn = 0, | |
308 | }; | |
23e6a7ea | 309 | int ret; |
a622ab72 | 310 | |
cfcdbde3 | 311 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 312 | |
18b559d5 JB |
313 | switch (reason) { |
314 | case AGG_STOP_DECLINED: | |
315 | case AGG_STOP_LOCAL_REQUEST: | |
316 | case AGG_STOP_PEER_REQUEST: | |
50ea05ef | 317 | params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
18b559d5 JB |
318 | break; |
319 | case AGG_STOP_DESTROY_STA: | |
50ea05ef | 320 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
18b559d5 JB |
321 | break; |
322 | default: | |
323 | WARN_ON_ONCE(1); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
cfcdbde3 JB |
327 | spin_lock_bh(&sta->lock); |
328 | ||
40b275b6 JB |
329 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
330 | if (!tid_tx) { | |
331 | spin_unlock_bh(&sta->lock); | |
332 | return -ENOENT; | |
333 | } | |
334 | ||
18b559d5 JB |
335 | /* |
336 | * if we're already stopping ignore any new requests to stop | |
337 | * unless we're destroying it in which case notify the driver | |
338 | */ | |
24f50a9d JB |
339 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
340 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
341 | if (reason != AGG_STOP_DESTROY_STA) |
342 | return -EALREADY; | |
50ea05ef SS |
343 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
344 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); | |
18b559d5 | 345 | WARN_ON_ONCE(ret); |
8147dc7f | 346 | return 0; |
24f50a9d JB |
347 | } |
348 | ||
0ab33703 JB |
349 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
350 | /* not even started yet! */ | |
ec034b20 | 351 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 352 | spin_unlock_bh(&sta->lock); |
0744371a | 353 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
354 | return 0; |
355 | } | |
356 | ||
24f50a9d JB |
357 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
358 | ||
cfcdbde3 JB |
359 | spin_unlock_bh(&sta->lock); |
360 | ||
bdcbd8e0 JB |
361 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
362 | sta->sta.addr, tid); | |
827d42c9 | 363 | |
44271488 | 364 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 365 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 366 | |
a622ab72 JB |
367 | /* |
368 | * After this packets are no longer handed right through | |
369 | * to the driver but are put onto tid_tx->pending instead, | |
370 | * with locking to ensure proper access. | |
371 | */ | |
372 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 373 | |
2a1e0fd1 EG |
374 | /* |
375 | * There might be a few packets being processed right now (on | |
376 | * another CPU) that have already gotten past the aggregation | |
377 | * check when it was still OPERATIONAL and consequently have | |
378 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
379 | * call into the driver at the same time or even before the | |
380 | * TX paths calls into it, which could confuse the driver. | |
381 | * | |
382 | * Wait for all currently running TX paths to finish before | |
383 | * telling the driver. New packets will not go through since | |
384 | * the aggregation session is no longer OPERATIONAL. | |
385 | */ | |
386 | synchronize_net(); | |
387 | ||
c82c4a80 JB |
388 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
389 | WLAN_BACK_RECIPIENT : | |
390 | WLAN_BACK_INITIATOR; | |
391 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 392 | |
50ea05ef | 393 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
23e6a7ea JB |
394 | |
395 | /* HW shall not deny going back to legacy */ | |
396 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
397 | /* |
398 | * We may have pending packets get stuck in this case... | |
399 | * Not bothering with a workaround for now. | |
400 | */ | |
23e6a7ea JB |
401 | } |
402 | ||
8147dc7f JB |
403 | /* |
404 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
405 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
406 | * seem like we can leave the tid_tx data pending forever. | |
407 | * This is true, in a way, but "forever" is only until the | |
408 | * station struct is actually destroyed. In the meantime, | |
409 | * leaving it around ensures that we don't transmit packets | |
410 | * to the driver on this TID which might confuse it. | |
411 | */ | |
18b559d5 JB |
412 | |
413 | return 0; | |
23e6a7ea JB |
414 | } |
415 | ||
b8695a8f JB |
416 | /* |
417 | * After sending add Block Ack request we activated a timer until | |
418 | * add Block Ack response will arrive from the recipient. | |
419 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
420 | */ | |
421 | static void sta_addba_resp_timer_expired(unsigned long data) | |
422 | { | |
423 | /* not an elegant detour, but there is no choice as the timer passes | |
424 | * only one argument, and both sta_info and TID are needed, so init | |
425 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
426 | * array gives the sta through container_of */ | |
427 | u16 tid = *(u8 *)data; | |
23e6a7ea | 428 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 429 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 430 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 431 | |
b8695a8f | 432 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
433 | rcu_read_lock(); |
434 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
435 | if (!tid_tx || |
436 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 437 | rcu_read_unlock(); |
bdcbd8e0 | 438 | ht_dbg(sta->sdata, |
0a214d3f JB |
439 | "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n", |
440 | sta->sta.addr, tid); | |
23e6a7ea | 441 | return; |
b8695a8f JB |
442 | } |
443 | ||
0a214d3f JB |
444 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
445 | sta->sta.addr, tid); | |
b8695a8f | 446 | |
83a5cbf7 JB |
447 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
448 | rcu_read_unlock(); | |
b8695a8f JB |
449 | } |
450 | ||
67c282c0 | 451 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 452 | { |
40b275b6 | 453 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
454 | struct ieee80211_local *local = sta->local; |
455 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
50ea05ef SS |
456 | struct ieee80211_ampdu_params params = { |
457 | .sta = &sta->sta, | |
458 | .action = IEEE80211_AMPDU_TX_START, | |
459 | .tid = tid, | |
460 | .buf_size = 0, | |
461 | .amsdu = false, | |
462 | .timeout = 0, | |
463 | }; | |
0ab33703 JB |
464 | int ret; |
465 | ||
40b275b6 | 466 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 467 | |
0ab33703 | 468 | /* |
15062e6a JB |
469 | * Start queuing up packets for this aggregation session. |
470 | * We're going to release them once the driver is OK with | |
471 | * that. | |
0ab33703 | 472 | */ |
0ab33703 JB |
473 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
474 | ||
ba8c3d6f FF |
475 | ieee80211_agg_stop_txq(sta, tid); |
476 | ||
0ab33703 | 477 | /* |
15062e6a JB |
478 | * Make sure no packets are being processed. This ensures that |
479 | * we have a valid starting sequence number and that in-flight | |
480 | * packets have been flushed out and no packets for this TID | |
481 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 482 | */ |
cfcdbde3 JB |
483 | synchronize_net(); |
484 | ||
50ea05ef SS |
485 | params.ssn = sta->tid_seq[tid] >> 4; |
486 | ret = drv_ampdu_action(local, sdata, ¶ms); | |
0ab33703 | 487 | if (ret) { |
bdcbd8e0 | 488 | ht_dbg(sdata, |
0a214d3f JB |
489 | "BA request denied - HW unavailable for %pM tid %d\n", |
490 | sta->sta.addr, tid); | |
cfcdbde3 | 491 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 492 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 493 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 494 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
495 | spin_unlock_bh(&sta->lock); |
496 | ||
ba8c3d6f FF |
497 | ieee80211_agg_start_txq(sta, tid, false); |
498 | ||
0744371a | 499 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
500 | return; |
501 | } | |
502 | ||
0ab33703 JB |
503 | /* activate the timer for the recipient's addBA response */ |
504 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
0a214d3f JB |
505 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
506 | sta->sta.addr, tid); | |
0ab33703 | 507 | |
cfcdbde3 | 508 | spin_lock_bh(&sta->lock); |
84381b4e | 509 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 510 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 511 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
512 | |
513 | /* send AddBA request */ | |
514 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
50ea05ef | 515 | tid_tx->dialog_token, params.ssn, |
ac062197 | 516 | IEEE80211_MAX_AMPDU_BUF, |
5dd36bc9 | 517 | tid_tx->timeout); |
0ab33703 JB |
518 | } |
519 | ||
285fa695 NM |
520 | /* |
521 | * After accepting the AddBA Response we activated a timer, | |
522 | * resetting it after each frame that we send. | |
523 | */ | |
524 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
525 | { | |
526 | /* not an elegant detour, but there is no choice as the timer passes | |
527 | * only one argument, and various sta_info are needed here, so init | |
528 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
529 | * array gives the sta through container_of */ | |
530 | u8 *ptid = (u8 *)data; | |
531 | u8 *timer_to_id = ptid - *ptid; | |
532 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
533 | timer_to_tid[0]); | |
12d3952f FF |
534 | struct tid_ampdu_tx *tid_tx; |
535 | unsigned long timeout; | |
536 | ||
9e73dee7 JB |
537 | rcu_read_lock(); |
538 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
539 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
540 | rcu_read_unlock(); | |
12d3952f | 541 | return; |
9e73dee7 | 542 | } |
12d3952f FF |
543 | |
544 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
545 | if (time_is_after_jiffies(timeout)) { | |
546 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 547 | rcu_read_unlock(); |
12d3952f FF |
548 | return; |
549 | } | |
285fa695 | 550 | |
9e73dee7 JB |
551 | rcu_read_unlock(); |
552 | ||
0a214d3f JB |
553 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
554 | sta->sta.addr, (u16)*ptid); | |
285fa695 NM |
555 | |
556 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
557 | } | |
558 | ||
bd2ce6e4 SM |
559 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
560 | u16 timeout) | |
b8695a8f | 561 | { |
c951ad35 JB |
562 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
563 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
564 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 565 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 566 | int ret = 0; |
b8695a8f | 567 | |
8f9c77fc JB |
568 | trace_api_start_tx_ba_session(pubsta, tid); |
569 | ||
b6da911b LK |
570 | if (WARN(sta->reserved_tid == tid, |
571 | "Requested to start BA session on reserved tid=%d", tid)) | |
572 | return -EINVAL; | |
573 | ||
8f9c77fc JB |
574 | if (!pubsta->ht_cap.ht_supported) |
575 | return -EINVAL; | |
b5878a2d | 576 | |
50c16e22 | 577 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
578 | return -EINVAL; |
579 | ||
5a306f58 | 580 | if ((tid >= IEEE80211_NUM_TIDS) || |
30686bf7 JB |
581 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
582 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
583 | return -EINVAL; |
584 | ||
85d5313e JB |
585 | if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
586 | return -EINVAL; | |
587 | ||
bdcbd8e0 JB |
588 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
589 | pubsta->addr, tid); | |
b8695a8f | 590 | |
c951ad35 | 591 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 592 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 593 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
594 | sdata->vif.type != NL80211_IFTYPE_AP && |
595 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 596 | return -EINVAL; |
8abd3f9b | 597 | |
c2c98fde | 598 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 599 | ht_dbg(sdata, |
0a214d3f JB |
600 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
601 | sta->sta.addr, tid); | |
c951ad35 | 602 | return -EINVAL; |
722f069a S |
603 | } |
604 | ||
ff3cc5f4 SW |
605 | /* |
606 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
607 | * member of an IBSS, and has no other existing Block Ack agreement | |
608 | * with the recipient STA, then the initiating STA shall transmit a | |
609 | * Probe Request frame to the recipient STA and shall not transmit an | |
610 | * ADDBA Request frame unless it receives a Probe Response frame | |
611 | * from the recipient within dot11ADDBAFailureTimeout. | |
612 | * | |
613 | * The probe request mechanism for ADDBA is currently not implemented, | |
614 | * but we only build up Block Ack session with HT STAs. This information | |
615 | * is set when we receive a bss info from a probe response or a beacon. | |
616 | */ | |
617 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
618 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
619 | ht_dbg(sdata, |
620 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
621 | pubsta->addr); | |
ff3cc5f4 SW |
622 | return -EINVAL; |
623 | } | |
624 | ||
b8695a8f JB |
625 | spin_lock_bh(&sta->lock); |
626 | ||
627 | /* we have tried too many times, receiver does not want A-MPDU */ | |
628 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
629 | ret = -EBUSY; | |
84381b4e NM |
630 | goto err_unlock_sta; |
631 | } | |
632 | ||
633 | /* | |
634 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
635 | * will spread our requests in time to avoid stalling connection | |
636 | * for too long | |
637 | */ | |
638 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
639 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
640 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 641 | ht_dbg(sdata, |
0a214d3f JB |
642 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
643 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); | |
84381b4e | 644 | ret = -EBUSY; |
b8695a8f JB |
645 | goto err_unlock_sta; |
646 | } | |
647 | ||
40b275b6 | 648 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 649 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 650 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 651 | ht_dbg(sdata, |
0a214d3f JB |
652 | "BA request denied - session is not idle on %pM tid %u\n", |
653 | sta->sta.addr, tid); | |
b8695a8f JB |
654 | ret = -EAGAIN; |
655 | goto err_unlock_sta; | |
656 | } | |
657 | ||
658 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
659 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
660 | if (!tid_tx) { | |
b8695a8f | 661 | ret = -ENOMEM; |
0ab33703 | 662 | goto err_unlock_sta; |
b8695a8f | 663 | } |
96f5e66e | 664 | |
a622ab72 | 665 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 666 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 667 | |
bd2ce6e4 SM |
668 | tid_tx->timeout = timeout; |
669 | ||
285fa695 | 670 | /* response timer */ |
f8f118ce OL |
671 | setup_timer(&tid_tx->addba_resp_timer, |
672 | sta_addba_resp_timer_expired, | |
673 | (unsigned long)&sta->timer_to_tid[tid]); | |
b8695a8f | 674 | |
285fa695 | 675 | /* tx timer */ |
f8f118ce OL |
676 | setup_deferrable_timer(&tid_tx->session_timer, |
677 | sta_tx_agg_session_timer_expired, | |
678 | (unsigned long)&sta->timer_to_tid[tid]); | |
285fa695 | 679 | |
0ab33703 | 680 | /* assign a dialog token */ |
b8695a8f | 681 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 682 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 683 | |
ec034b20 JB |
684 | /* |
685 | * Finally, assign it to the start array; the work item will | |
686 | * collect it and move it to the normal array. | |
687 | */ | |
688 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 689 | |
0ab33703 | 690 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 691 | |
0ab33703 | 692 | /* this flow continues off the work */ |
96f5e66e | 693 | err_unlock_sta: |
b8695a8f | 694 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
695 | return ret; |
696 | } | |
697 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
698 | ||
b1720231 JB |
699 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
700 | struct sta_info *sta, u16 tid) | |
701 | { | |
40b275b6 | 702 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
703 | struct ieee80211_ampdu_params params = { |
704 | .sta = &sta->sta, | |
705 | .action = IEEE80211_AMPDU_TX_OPERATIONAL, | |
706 | .tid = tid, | |
707 | .timeout = 0, | |
708 | .ssn = 0, | |
709 | }; | |
40b275b6 | 710 | |
cfcdbde3 | 711 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 712 | |
40b275b6 | 713 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
50ea05ef SS |
714 | params.buf_size = tid_tx->buf_size; |
715 | params.amsdu = tid_tx->amsdu; | |
40b275b6 | 716 | |
0a214d3f JB |
717 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
718 | sta->sta.addr, tid); | |
b1720231 | 719 | |
50ea05ef | 720 | drv_ampdu_action(local, sta->sdata, ¶ms); |
cfcdbde3 JB |
721 | |
722 | /* | |
723 | * synchronize with TX path, while splicing the TX path | |
724 | * should block so it won't put more packets onto pending. | |
725 | */ | |
726 | spin_lock_bh(&sta->lock); | |
727 | ||
3a25a8c8 | 728 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 729 | /* |
a622ab72 JB |
730 | * Now mark as operational. This will be visible |
731 | * in the TX path, and lets it go lock-free in | |
732 | * the common case. | |
cd8ffc80 | 733 | */ |
40b275b6 | 734 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 735 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 736 | |
cfcdbde3 | 737 | spin_unlock_bh(&sta->lock); |
ba8c3d6f FF |
738 | |
739 | ieee80211_agg_start_txq(sta, tid, true); | |
b1720231 JB |
740 | } |
741 | ||
7a7c0a64 JB |
742 | void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, |
743 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 744 | { |
7a7c0a64 | 745 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c951ad35 | 746 | struct ieee80211_local *local = sdata->local; |
b8695a8f | 747 | |
7a7c0a64 JB |
748 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
749 | return; | |
750 | ||
751 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) | |
752 | ieee80211_agg_tx_operational(local, sta, tid); | |
753 | } | |
754 | ||
755 | static struct tid_ampdu_tx * | |
756 | ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata, | |
757 | const u8 *ra, u16 tid, struct sta_info **sta) | |
758 | { | |
759 | struct tid_ampdu_tx *tid_tx; | |
b5878a2d | 760 | |
5a306f58 | 761 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 762 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 763 | tid, IEEE80211_NUM_TIDS); |
7a7c0a64 | 764 | return NULL; |
b8695a8f JB |
765 | } |
766 | ||
7a7c0a64 JB |
767 | *sta = sta_info_get_bss(sdata, ra); |
768 | if (!*sta) { | |
bdcbd8e0 | 769 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
7a7c0a64 | 770 | return NULL; |
b8695a8f JB |
771 | } |
772 | ||
7a7c0a64 | 773 | tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]); |
b8695a8f | 774 | |
7a7c0a64 | 775 | if (WARN_ON(!tid_tx)) |
bdcbd8e0 | 776 | ht_dbg(sdata, "addBA was not requested!\n"); |
96f5e66e | 777 | |
7a7c0a64 | 778 | return tid_tx; |
b8695a8f | 779 | } |
b8695a8f | 780 | |
c951ad35 | 781 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
782 | const u8 *ra, u16 tid) |
783 | { | |
c951ad35 JB |
784 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
785 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
786 | struct sta_info *sta; |
787 | struct tid_ampdu_tx *tid_tx; | |
86ab6c5a | 788 | |
7a7c0a64 | 789 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 790 | |
7a7c0a64 JB |
791 | rcu_read_lock(); |
792 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
793 | if (!tid_tx) | |
794 | goto out; | |
86ab6c5a | 795 | |
7a7c0a64 JB |
796 | set_bit(HT_AGG_STATE_START_CB, &tid_tx->state); |
797 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
798 | out: | |
799 | rcu_read_unlock(); | |
86ab6c5a JB |
800 | } |
801 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
802 | ||
849b7967 | 803 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 804 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 805 | { |
849b7967 JB |
806 | int ret; |
807 | ||
cfcdbde3 | 808 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 809 | |
c82c4a80 | 810 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 811 | |
cfcdbde3 JB |
812 | mutex_unlock(&sta->ampdu_mlme.mtx); |
813 | ||
849b7967 JB |
814 | return ret; |
815 | } | |
b8695a8f | 816 | |
6a8579d0 | 817 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 818 | { |
c951ad35 JB |
819 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
820 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
821 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
822 | struct tid_ampdu_tx *tid_tx; |
823 | int ret = 0; | |
b8695a8f | 824 | |
6a8579d0 | 825 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 826 | |
4253119a | 827 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
828 | return -EINVAL; |
829 | ||
5a306f58 | 830 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
831 | return -EINVAL; |
832 | ||
0ab33703 | 833 | spin_lock_bh(&sta->lock); |
40b275b6 | 834 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
835 | |
836 | if (!tid_tx) { | |
837 | ret = -ENOENT; | |
838 | goto unlock; | |
839 | } | |
840 | ||
b6da911b LK |
841 | WARN(sta->reserved_tid == tid, |
842 | "Requested to stop BA session on reserved tid=%d", tid); | |
843 | ||
0ab33703 JB |
844 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
845 | /* already in progress stopping it */ | |
846 | ret = 0; | |
847 | goto unlock; | |
848 | } | |
849 | ||
850 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
851 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
852 | ||
853 | unlock: | |
854 | spin_unlock_bh(&sta->lock); | |
855 | return ret; | |
b8695a8f JB |
856 | } |
857 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
858 | ||
7a7c0a64 JB |
859 | void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, |
860 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 861 | { |
7a7c0a64 | 862 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
2c158887 | 863 | bool send_delba = false; |
b8695a8f | 864 | |
7a7c0a64 JB |
865 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", |
866 | sta->sta.addr, tid); | |
b8695a8f | 867 | |
a622ab72 | 868 | spin_lock_bh(&sta->lock); |
a622ab72 | 869 | |
7a7c0a64 | 870 | if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
0a214d3f JB |
871 | ht_dbg(sdata, |
872 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
873 | sta->sta.addr, tid); | |
cfcdbde3 | 874 | goto unlock_sta; |
b8695a8f JB |
875 | } |
876 | ||
53f73c09 | 877 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 878 | send_delba = true; |
b8695a8f | 879 | |
faec12ee | 880 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 881 | |
cfcdbde3 | 882 | unlock_sta: |
a622ab72 | 883 | spin_unlock_bh(&sta->lock); |
2c158887 JB |
884 | |
885 | if (send_delba) | |
7a7c0a64 | 886 | ieee80211_send_delba(sdata, sta->sta.addr, tid, |
2c158887 | 887 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
b8695a8f | 888 | } |
b8695a8f | 889 | |
c951ad35 | 890 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
891 | const u8 *ra, u16 tid) |
892 | { | |
c951ad35 JB |
893 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
894 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
895 | struct sta_info *sta; |
896 | struct tid_ampdu_tx *tid_tx; | |
b8695a8f | 897 | |
7a7c0a64 | 898 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 899 | |
7a7c0a64 JB |
900 | rcu_read_lock(); |
901 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
902 | if (!tid_tx) | |
903 | goto out; | |
b8695a8f | 904 | |
7a7c0a64 JB |
905 | set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state); |
906 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
907 | out: | |
908 | rcu_read_unlock(); | |
b8695a8f JB |
909 | } |
910 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
911 | ||
86ab6c5a | 912 | |
b8695a8f JB |
913 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
914 | struct sta_info *sta, | |
915 | struct ieee80211_mgmt *mgmt, | |
916 | size_t len) | |
917 | { | |
a622ab72 | 918 | struct tid_ampdu_tx *tid_tx; |
6e0456b5 | 919 | struct ieee80211_txq *txq; |
b1720231 | 920 | u16 capab, tid; |
0b01f030 | 921 | u8 buf_size; |
e3abc8ff | 922 | bool amsdu; |
b8695a8f JB |
923 | |
924 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
e3abc8ff | 925 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
b8695a8f | 926 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
0b01f030 | 927 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
ac062197 | 928 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
b8695a8f | 929 | |
6e0456b5 FF |
930 | txq = sta->sta.txq[tid]; |
931 | if (!amsdu && txq) | |
932 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); | |
933 | ||
cfcdbde3 | 934 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 935 | |
40b275b6 | 936 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 937 | if (!tid_tx) |
8ade0082 | 938 | goto out; |
b8695a8f | 939 | |
a622ab72 | 940 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
941 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
942 | sta->sta.addr, tid); | |
8ade0082 | 943 | goto out; |
b8695a8f JB |
944 | } |
945 | ||
d305a655 | 946 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 947 | |
0a214d3f JB |
948 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
949 | sta->sta.addr, tid); | |
d305a655 NM |
950 | |
951 | /* | |
952 | * addba_resp_timer may have fired before we got here, and | |
953 | * caused WANT_STOP to be set. If the stop then was already | |
954 | * processed further, STOPPING might be set. | |
955 | */ | |
956 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
957 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 958 | ht_dbg(sta->sdata, |
0a214d3f JB |
959 | "got addBA resp for %pM tid %d but we already gave up\n", |
960 | sta->sta.addr, tid); | |
d305a655 NM |
961 | goto out; |
962 | } | |
963 | ||
3ca97880 HS |
964 | /* |
965 | * IEEE 802.11-2007 7.3.1.14: | |
966 | * In an ADDBA Response frame, when the Status Code field | |
967 | * is set to 0, the Buffer Size subfield is set to a value | |
968 | * of at least 1. | |
969 | */ | |
b8695a8f | 970 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 971 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
972 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
973 | &tid_tx->state)) { | |
974 | /* ignore duplicate response */ | |
975 | goto out; | |
976 | } | |
b8695a8f | 977 | |
0b01f030 | 978 | tid_tx->buf_size = buf_size; |
e3abc8ff | 979 | tid_tx->amsdu = amsdu; |
0b01f030 | 980 | |
a622ab72 | 981 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 982 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 983 | |
b1720231 | 984 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 985 | |
12d3952f | 986 | if (tid_tx->timeout) { |
285fa695 NM |
987 | mod_timer(&tid_tx->session_timer, |
988 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
989 | tid_tx->last_tx = jiffies; |
990 | } | |
285fa695 | 991 | |
b8695a8f | 992 | } else { |
c82c4a80 | 993 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 994 | } |
2171abc5 | 995 | |
2171abc5 | 996 | out: |
cfcdbde3 | 997 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 998 | } |