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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 |
6157ca0d | 11 | * Copyright (C) 2018 - 2019 Intel Corporation |
b8695a8f JB |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
bc3b2d7f | 20 | #include <linux/export.h> |
b8695a8f JB |
21 | #include <net/mac80211.h> |
22 | #include "ieee80211_i.h" | |
24487981 | 23 | #include "driver-ops.h" |
b8695a8f JB |
24 | #include "wme.h" |
25 | ||
86ab6c5a | 26 | /** |
73a72a81 | 27 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
28 | * |
29 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
30 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
31 | * packets with a flag indicating A-MPDU aggregation. The driver | |
32 | * or device is responsible for actually aggregating the frames, | |
33 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 34 | * |
73a72a81 JB |
35 | * When TX aggregation is started by some subsystem (usually the rate |
36 | * control algorithm would be appropriate) by calling the | |
37 | * ieee80211_start_tx_ba_session() function, the driver will be | |
38 | * notified via its @ampdu_action function, with the | |
39 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
40 | * |
41 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
42 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
43 | * start the aggregation session after the peer has also responded. | |
44 | * If the peer responds negatively, the session will be stopped | |
45 | * again right away. Note that it is possible for the aggregation | |
46 | * session to be stopped before the driver has indicated that it | |
47 | * is done setting it up, in which case it must not indicate the | |
48 | * setup completion. | |
86ab6c5a | 49 | * |
73a72a81 JB |
50 | * Also note that, since we also need to wait for a response from |
51 | * the peer, the driver is notified of the completion of the | |
52 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
53 | * @ampdu_action callback. | |
54 | * | |
55 | * Similarly, when the aggregation session is stopped by the peer | |
56 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
57 | * @ampdu_action function will be called with the action | |
58 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
59 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
42624d49 YAP |
60 | * Note that the sta can get destroyed before the BA tear down is |
61 | * complete. | |
86ab6c5a JB |
62 | */ |
63 | ||
b8695a8f JB |
64 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
65 | const u8 *da, u16 tid, | |
66 | u8 dialog_token, u16 start_seq_num, | |
67 | u16 agg_size, u16 timeout) | |
68 | { | |
69 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
70 | struct sk_buff *skb; |
71 | struct ieee80211_mgmt *mgmt; | |
72 | u16 capab; | |
73 | ||
74 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
75 | ||
d15b8459 | 76 | if (!skb) |
b8695a8f | 77 | return; |
d15b8459 | 78 | |
b8695a8f | 79 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 80 | mgmt = skb_put_zero(skb, 24); |
b8695a8f | 81 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 82 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 83 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
84 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
85 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 86 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
87 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
88 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
13c40c54 AS |
89 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
90 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); | |
b8695a8f JB |
91 | |
92 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
93 | IEEE80211_STYPE_ACTION); | |
94 | ||
95 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
96 | ||
97 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
98 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
99 | ||
100 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
e3abc8ff EG |
101 | capab = (u16)(1 << 0); /* bit 0 A-MSDU support */ |
102 | capab |= (u16)(1 << 1); /* bit 1 aggregation policy */ | |
b8695a8f JB |
103 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
104 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
105 | ||
106 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
107 | ||
108 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
109 | mgmt->u.action.u.addba_req.start_seq_num = | |
110 | cpu_to_le16(start_seq_num << 4); | |
111 | ||
c6e13327 | 112 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
113 | } |
114 | ||
8c771244 | 115 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 116 | { |
8c771244 | 117 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
118 | struct ieee80211_local *local = sdata->local; |
119 | struct sk_buff *skb; | |
120 | struct ieee80211_bar *bar; | |
121 | u16 bar_control = 0; | |
122 | ||
123 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 124 | if (!skb) |
b8695a8f | 125 | return; |
d15b8459 | 126 | |
b8695a8f | 127 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 128 | bar = skb_put_zero(skb, sizeof(*bar)); |
b8695a8f JB |
129 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
130 | IEEE80211_STYPE_BACK_REQ); | |
131 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 132 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
133 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
134 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 135 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
136 | bar->control = cpu_to_le16(bar_control); |
137 | bar->start_seq_num = cpu_to_le16(ssn); | |
138 | ||
2f7916f8 CL |
139 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
140 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
cf6bb79a | 141 | ieee80211_tx_skb_tid(sdata, skb, tid); |
b8695a8f | 142 | } |
8c771244 | 143 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 144 | |
ec034b20 JB |
145 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
146 | struct tid_ampdu_tx *tid_tx) | |
147 | { | |
148 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
149 | lockdep_assert_held(&sta->lock); | |
150 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
151 | } | |
152 | ||
30bf5f1f JB |
153 | /* |
154 | * When multiple aggregation sessions on multiple stations | |
155 | * are being created/destroyed simultaneously, we need to | |
156 | * refcount the global queue stop caused by that in order | |
157 | * to not get into a situation where one of the aggregation | |
158 | * setup or teardown re-enables queues before the other is | |
159 | * ready to handle that. | |
160 | * | |
161 | * These two functions take care of this issue by keeping | |
162 | * a global "agg_queue_stop" refcount. | |
163 | */ | |
164 | static void __acquires(agg_queue) | |
165 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
166 | { | |
167 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
168 | ||
cca07b00 LC |
169 | /* we do refcounting here, so don't use the queue reason refcounting */ |
170 | ||
30bf5f1f JB |
171 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
172 | ieee80211_stop_queue_by_reason( | |
173 | &sdata->local->hw, queue, | |
cca07b00 LC |
174 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
175 | false); | |
30bf5f1f JB |
176 | __acquire(agg_queue); |
177 | } | |
178 | ||
179 | static void __releases(agg_queue) | |
180 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
181 | { | |
182 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
183 | ||
184 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) | |
185 | ieee80211_wake_queue_by_reason( | |
186 | &sdata->local->hw, queue, | |
cca07b00 LC |
187 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
188 | false); | |
30bf5f1f JB |
189 | __release(agg_queue); |
190 | } | |
191 | ||
ba8c3d6f FF |
192 | static void |
193 | ieee80211_agg_stop_txq(struct sta_info *sta, int tid) | |
194 | { | |
195 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
fa962b92 MK |
196 | struct ieee80211_sub_if_data *sdata; |
197 | struct fq *fq; | |
ba8c3d6f FF |
198 | struct txq_info *txqi; |
199 | ||
200 | if (!txq) | |
201 | return; | |
202 | ||
203 | txqi = to_txq_info(txq); | |
fa962b92 MK |
204 | sdata = vif_to_sdata(txq->vif); |
205 | fq = &sdata->local->fq; | |
ba8c3d6f FF |
206 | |
207 | /* Lock here to protect against further seqno updates on dequeue */ | |
fa962b92 | 208 | spin_lock_bh(&fq->lock); |
ba8c3d6f | 209 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
fa962b92 | 210 | spin_unlock_bh(&fq->lock); |
ba8c3d6f FF |
211 | } |
212 | ||
213 | static void | |
214 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) | |
215 | { | |
216 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
217 | struct txq_info *txqi; | |
218 | ||
219 | if (!txq) | |
220 | return; | |
221 | ||
222 | txqi = to_txq_info(txq); | |
223 | ||
224 | if (enable) | |
225 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
226 | else | |
227 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
228 | ||
229 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
979e1f08 JB |
230 | local_bh_disable(); |
231 | rcu_read_lock(); | |
e7881bd5 | 232 | drv_wake_tx_queue(sta->sdata->local, txqi); |
979e1f08 JB |
233 | rcu_read_unlock(); |
234 | local_bh_enable(); | |
ba8c3d6f FF |
235 | } |
236 | ||
30bf5f1f JB |
237 | /* |
238 | * splice packets from the STA's pending to the local pending, | |
239 | * requires a call to ieee80211_agg_splice_finish later | |
240 | */ | |
241 | static void __acquires(agg_queue) | |
242 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
243 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
244 | { | |
245 | struct ieee80211_local *local = sdata->local; | |
246 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
247 | unsigned long flags; | |
248 | ||
249 | ieee80211_stop_queue_agg(sdata, tid); | |
250 | ||
251 | if (WARN(!tid_tx, | |
252 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
253 | tid)) | |
254 | return; | |
255 | ||
256 | if (!skb_queue_empty(&tid_tx->pending)) { | |
257 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
258 | /* copy over remaining packets */ | |
259 | skb_queue_splice_tail_init(&tid_tx->pending, | |
260 | &local->pending[queue]); | |
261 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
262 | } | |
263 | } | |
264 | ||
265 | static void __releases(agg_queue) | |
266 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
267 | { | |
268 | ieee80211_wake_queue_agg(sdata, tid); | |
269 | } | |
270 | ||
271 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
272 | { | |
273 | struct tid_ampdu_tx *tid_tx; | |
274 | ||
275 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
276 | lockdep_assert_held(&sta->lock); | |
277 | ||
278 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
279 | ||
280 | /* | |
281 | * When we get here, the TX path will not be lockless any more wrt. | |
282 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
283 | * Thus it will block on getting the lock, if it occurs. So if we | |
284 | * stop the queue now, we will not get any more packets, and any | |
285 | * that might be being processed will wait for us here, thereby | |
286 | * guaranteeing that no packets go to the tid_tx pending queue any | |
287 | * more. | |
288 | */ | |
289 | ||
290 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
291 | ||
292 | /* future packets must not find the tid_tx struct any more */ | |
293 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
294 | ||
295 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
ba8c3d6f | 296 | ieee80211_agg_start_txq(sta, tid, false); |
30bf5f1f JB |
297 | |
298 | kfree_rcu(tid_tx, rcu_head); | |
299 | } | |
300 | ||
67c282c0 | 301 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 302 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 303 | { |
849b7967 | 304 | struct ieee80211_local *local = sta->local; |
40b275b6 | 305 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
306 | struct ieee80211_ampdu_params params = { |
307 | .sta = &sta->sta, | |
308 | .tid = tid, | |
309 | .buf_size = 0, | |
310 | .amsdu = false, | |
311 | .timeout = 0, | |
312 | .ssn = 0, | |
313 | }; | |
23e6a7ea | 314 | int ret; |
a622ab72 | 315 | |
cfcdbde3 | 316 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 317 | |
18b559d5 JB |
318 | switch (reason) { |
319 | case AGG_STOP_DECLINED: | |
320 | case AGG_STOP_LOCAL_REQUEST: | |
321 | case AGG_STOP_PEER_REQUEST: | |
50ea05ef | 322 | params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
18b559d5 JB |
323 | break; |
324 | case AGG_STOP_DESTROY_STA: | |
50ea05ef | 325 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
18b559d5 JB |
326 | break; |
327 | default: | |
328 | WARN_ON_ONCE(1); | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
cfcdbde3 JB |
332 | spin_lock_bh(&sta->lock); |
333 | ||
33ddd81e JB |
334 | /* free struct pending for start, if present */ |
335 | tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; | |
336 | kfree(tid_tx); | |
337 | sta->ampdu_mlme.tid_start_tx[tid] = NULL; | |
338 | ||
40b275b6 JB |
339 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
340 | if (!tid_tx) { | |
341 | spin_unlock_bh(&sta->lock); | |
342 | return -ENOENT; | |
343 | } | |
344 | ||
18b559d5 JB |
345 | /* |
346 | * if we're already stopping ignore any new requests to stop | |
347 | * unless we're destroying it in which case notify the driver | |
348 | */ | |
24f50a9d JB |
349 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
350 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
351 | if (reason != AGG_STOP_DESTROY_STA) |
352 | return -EALREADY; | |
50ea05ef SS |
353 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
354 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); | |
18b559d5 | 355 | WARN_ON_ONCE(ret); |
8147dc7f | 356 | return 0; |
24f50a9d JB |
357 | } |
358 | ||
0ab33703 JB |
359 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
360 | /* not even started yet! */ | |
ec034b20 | 361 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 362 | spin_unlock_bh(&sta->lock); |
0744371a | 363 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
364 | return 0; |
365 | } | |
366 | ||
24f50a9d JB |
367 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
368 | ||
6157ca0d IP |
369 | ieee80211_agg_stop_txq(sta, tid); |
370 | ||
cfcdbde3 JB |
371 | spin_unlock_bh(&sta->lock); |
372 | ||
bdcbd8e0 JB |
373 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
374 | sta->sta.addr, tid); | |
827d42c9 | 375 | |
44271488 | 376 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 377 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 378 | |
a622ab72 JB |
379 | /* |
380 | * After this packets are no longer handed right through | |
381 | * to the driver but are put onto tid_tx->pending instead, | |
382 | * with locking to ensure proper access. | |
383 | */ | |
384 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 385 | |
2a1e0fd1 EG |
386 | /* |
387 | * There might be a few packets being processed right now (on | |
388 | * another CPU) that have already gotten past the aggregation | |
389 | * check when it was still OPERATIONAL and consequently have | |
390 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
391 | * call into the driver at the same time or even before the | |
392 | * TX paths calls into it, which could confuse the driver. | |
393 | * | |
394 | * Wait for all currently running TX paths to finish before | |
395 | * telling the driver. New packets will not go through since | |
396 | * the aggregation session is no longer OPERATIONAL. | |
397 | */ | |
2316380f SS |
398 | if (!local->in_reconfig) |
399 | synchronize_net(); | |
2a1e0fd1 | 400 | |
c82c4a80 JB |
401 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
402 | WLAN_BACK_RECIPIENT : | |
403 | WLAN_BACK_INITIATOR; | |
404 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 405 | |
50ea05ef | 406 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
23e6a7ea JB |
407 | |
408 | /* HW shall not deny going back to legacy */ | |
409 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
410 | /* |
411 | * We may have pending packets get stuck in this case... | |
412 | * Not bothering with a workaround for now. | |
413 | */ | |
23e6a7ea JB |
414 | } |
415 | ||
8147dc7f JB |
416 | /* |
417 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
418 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
419 | * seem like we can leave the tid_tx data pending forever. | |
420 | * This is true, in a way, but "forever" is only until the | |
421 | * station struct is actually destroyed. In the meantime, | |
422 | * leaving it around ensures that we don't transmit packets | |
423 | * to the driver on this TID which might confuse it. | |
424 | */ | |
18b559d5 JB |
425 | |
426 | return 0; | |
23e6a7ea JB |
427 | } |
428 | ||
b8695a8f JB |
429 | /* |
430 | * After sending add Block Ack request we activated a timer until | |
431 | * add Block Ack response will arrive from the recipient. | |
432 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
433 | */ | |
7cca2acd | 434 | static void sta_addba_resp_timer_expired(struct timer_list *t) |
b8695a8f | 435 | { |
d559e303 JB |
436 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer); |
437 | struct sta_info *sta = tid_tx->sta; | |
438 | u8 tid = tid_tx->tid; | |
23e6a7ea | 439 | |
b8695a8f | 440 | /* check if the TID waits for addBA response */ |
d559e303 | 441 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
bdcbd8e0 | 442 | ht_dbg(sta->sdata, |
d81b0fd0 | 443 | "timer expired on %pM tid %d not expecting addBA response\n", |
0a214d3f | 444 | sta->sta.addr, tid); |
23e6a7ea | 445 | return; |
b8695a8f JB |
446 | } |
447 | ||
0a214d3f JB |
448 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
449 | sta->sta.addr, tid); | |
b8695a8f | 450 | |
83a5cbf7 | 451 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
b8695a8f JB |
452 | } |
453 | ||
67c282c0 | 454 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 455 | { |
40b275b6 | 456 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
457 | struct ieee80211_local *local = sta->local; |
458 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
50ea05ef SS |
459 | struct ieee80211_ampdu_params params = { |
460 | .sta = &sta->sta, | |
461 | .action = IEEE80211_AMPDU_TX_START, | |
462 | .tid = tid, | |
463 | .buf_size = 0, | |
464 | .amsdu = false, | |
465 | .timeout = 0, | |
466 | }; | |
0ab33703 | 467 | int ret; |
41cbb0f5 | 468 | u16 buf_size; |
0ab33703 | 469 | |
40b275b6 | 470 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 471 | |
0ab33703 | 472 | /* |
15062e6a JB |
473 | * Start queuing up packets for this aggregation session. |
474 | * We're going to release them once the driver is OK with | |
475 | * that. | |
0ab33703 | 476 | */ |
0ab33703 JB |
477 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
478 | ||
ba8c3d6f FF |
479 | ieee80211_agg_stop_txq(sta, tid); |
480 | ||
0ab33703 | 481 | /* |
15062e6a JB |
482 | * Make sure no packets are being processed. This ensures that |
483 | * we have a valid starting sequence number and that in-flight | |
484 | * packets have been flushed out and no packets for this TID | |
485 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 486 | */ |
cfcdbde3 JB |
487 | synchronize_net(); |
488 | ||
50ea05ef SS |
489 | params.ssn = sta->tid_seq[tid] >> 4; |
490 | ret = drv_ampdu_action(local, sdata, ¶ms); | |
0ab33703 | 491 | if (ret) { |
bdcbd8e0 | 492 | ht_dbg(sdata, |
0a214d3f JB |
493 | "BA request denied - HW unavailable for %pM tid %d\n", |
494 | sta->sta.addr, tid); | |
cfcdbde3 | 495 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 496 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 497 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 498 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
499 | spin_unlock_bh(&sta->lock); |
500 | ||
ba8c3d6f FF |
501 | ieee80211_agg_start_txq(sta, tid, false); |
502 | ||
0744371a | 503 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
504 | return; |
505 | } | |
506 | ||
0ab33703 JB |
507 | /* activate the timer for the recipient's addBA response */ |
508 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
0a214d3f JB |
509 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
510 | sta->sta.addr, tid); | |
0ab33703 | 511 | |
cfcdbde3 | 512 | spin_lock_bh(&sta->lock); |
84381b4e | 513 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 514 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 515 | spin_unlock_bh(&sta->lock); |
0ab33703 | 516 | |
41cbb0f5 LC |
517 | if (sta->sta.he_cap.has_he) { |
518 | buf_size = local->hw.max_tx_aggregation_subframes; | |
519 | } else { | |
520 | /* | |
521 | * We really should use what the driver told us it will | |
522 | * transmit as the maximum, but certain APs (e.g. the | |
523 | * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012) | |
524 | * will crash when we use a lower number. | |
525 | */ | |
526 | buf_size = IEEE80211_MAX_AMPDU_BUF_HT; | |
527 | } | |
528 | ||
0ab33703 JB |
529 | /* send AddBA request */ |
530 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
50ea05ef | 531 | tid_tx->dialog_token, params.ssn, |
41cbb0f5 | 532 | buf_size, tid_tx->timeout); |
0ab33703 JB |
533 | } |
534 | ||
285fa695 NM |
535 | /* |
536 | * After accepting the AddBA Response we activated a timer, | |
537 | * resetting it after each frame that we send. | |
538 | */ | |
7cca2acd | 539 | static void sta_tx_agg_session_timer_expired(struct timer_list *t) |
285fa695 | 540 | { |
d559e303 JB |
541 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer); |
542 | struct sta_info *sta = tid_tx->sta; | |
543 | u8 tid = tid_tx->tid; | |
12d3952f FF |
544 | unsigned long timeout; |
545 | ||
d559e303 | 546 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
12d3952f | 547 | return; |
9e73dee7 | 548 | } |
12d3952f FF |
549 | |
550 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
551 | if (time_is_after_jiffies(timeout)) { | |
552 | mod_timer(&tid_tx->session_timer, timeout); | |
553 | return; | |
554 | } | |
285fa695 | 555 | |
0a214d3f | 556 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
7cca2acd | 557 | sta->sta.addr, tid); |
285fa695 | 558 | |
7cca2acd | 559 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
285fa695 NM |
560 | } |
561 | ||
bd2ce6e4 SM |
562 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
563 | u16 timeout) | |
b8695a8f | 564 | { |
c951ad35 JB |
565 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
566 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
567 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 568 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 569 | int ret = 0; |
b8695a8f | 570 | |
8f9c77fc JB |
571 | trace_api_start_tx_ba_session(pubsta, tid); |
572 | ||
b6da911b LK |
573 | if (WARN(sta->reserved_tid == tid, |
574 | "Requested to start BA session on reserved tid=%d", tid)) | |
575 | return -EINVAL; | |
576 | ||
8f9c77fc JB |
577 | if (!pubsta->ht_cap.ht_supported) |
578 | return -EINVAL; | |
b5878a2d | 579 | |
50c16e22 | 580 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
581 | return -EINVAL; |
582 | ||
5a306f58 | 583 | if ((tid >= IEEE80211_NUM_TIDS) || |
30686bf7 JB |
584 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
585 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
586 | return -EINVAL; |
587 | ||
85d5313e JB |
588 | if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
589 | return -EINVAL; | |
590 | ||
bdcbd8e0 JB |
591 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
592 | pubsta->addr, tid); | |
b8695a8f | 593 | |
c951ad35 | 594 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 595 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 596 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
597 | sdata->vif.type != NL80211_IFTYPE_AP && |
598 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 599 | return -EINVAL; |
8abd3f9b | 600 | |
c2c98fde | 601 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 602 | ht_dbg(sdata, |
0a214d3f JB |
603 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
604 | sta->sta.addr, tid); | |
c951ad35 | 605 | return -EINVAL; |
722f069a S |
606 | } |
607 | ||
ff3cc5f4 SW |
608 | /* |
609 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
610 | * member of an IBSS, and has no other existing Block Ack agreement | |
611 | * with the recipient STA, then the initiating STA shall transmit a | |
612 | * Probe Request frame to the recipient STA and shall not transmit an | |
613 | * ADDBA Request frame unless it receives a Probe Response frame | |
614 | * from the recipient within dot11ADDBAFailureTimeout. | |
615 | * | |
616 | * The probe request mechanism for ADDBA is currently not implemented, | |
617 | * but we only build up Block Ack session with HT STAs. This information | |
618 | * is set when we receive a bss info from a probe response or a beacon. | |
619 | */ | |
620 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
621 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
622 | ht_dbg(sdata, |
623 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
624 | pubsta->addr); | |
ff3cc5f4 SW |
625 | return -EINVAL; |
626 | } | |
627 | ||
b8695a8f JB |
628 | spin_lock_bh(&sta->lock); |
629 | ||
630 | /* we have tried too many times, receiver does not want A-MPDU */ | |
631 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
632 | ret = -EBUSY; | |
84381b4e NM |
633 | goto err_unlock_sta; |
634 | } | |
635 | ||
636 | /* | |
637 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
638 | * will spread our requests in time to avoid stalling connection | |
639 | * for too long | |
640 | */ | |
641 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
642 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
643 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 644 | ht_dbg(sdata, |
d81b0fd0 | 645 | "BA request denied - %d failed requests on %pM tid %u\n", |
0a214d3f | 646 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); |
84381b4e | 647 | ret = -EBUSY; |
b8695a8f JB |
648 | goto err_unlock_sta; |
649 | } | |
650 | ||
40b275b6 | 651 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 652 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 653 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 654 | ht_dbg(sdata, |
0a214d3f JB |
655 | "BA request denied - session is not idle on %pM tid %u\n", |
656 | sta->sta.addr, tid); | |
b8695a8f JB |
657 | ret = -EAGAIN; |
658 | goto err_unlock_sta; | |
659 | } | |
660 | ||
661 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
662 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
663 | if (!tid_tx) { | |
b8695a8f | 664 | ret = -ENOMEM; |
0ab33703 | 665 | goto err_unlock_sta; |
b8695a8f | 666 | } |
96f5e66e | 667 | |
a622ab72 | 668 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 669 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 670 | |
bd2ce6e4 | 671 | tid_tx->timeout = timeout; |
7cca2acd KC |
672 | tid_tx->sta = sta; |
673 | tid_tx->tid = tid; | |
bd2ce6e4 | 674 | |
285fa695 | 675 | /* response timer */ |
7cca2acd | 676 | timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0); |
b8695a8f | 677 | |
285fa695 | 678 | /* tx timer */ |
7cca2acd KC |
679 | timer_setup(&tid_tx->session_timer, |
680 | sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE); | |
285fa695 | 681 | |
0ab33703 | 682 | /* assign a dialog token */ |
b8695a8f | 683 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 684 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 685 | |
ec034b20 JB |
686 | /* |
687 | * Finally, assign it to the start array; the work item will | |
688 | * collect it and move it to the normal array. | |
689 | */ | |
690 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 691 | |
0ab33703 | 692 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 693 | |
0ab33703 | 694 | /* this flow continues off the work */ |
96f5e66e | 695 | err_unlock_sta: |
b8695a8f | 696 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
697 | return ret; |
698 | } | |
699 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
700 | ||
b1720231 JB |
701 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
702 | struct sta_info *sta, u16 tid) | |
703 | { | |
40b275b6 | 704 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
705 | struct ieee80211_ampdu_params params = { |
706 | .sta = &sta->sta, | |
707 | .action = IEEE80211_AMPDU_TX_OPERATIONAL, | |
708 | .tid = tid, | |
709 | .timeout = 0, | |
710 | .ssn = 0, | |
711 | }; | |
40b275b6 | 712 | |
cfcdbde3 | 713 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 714 | |
40b275b6 | 715 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
50ea05ef SS |
716 | params.buf_size = tid_tx->buf_size; |
717 | params.amsdu = tid_tx->amsdu; | |
40b275b6 | 718 | |
0a214d3f JB |
719 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
720 | sta->sta.addr, tid); | |
b1720231 | 721 | |
50ea05ef | 722 | drv_ampdu_action(local, sta->sdata, ¶ms); |
cfcdbde3 JB |
723 | |
724 | /* | |
725 | * synchronize with TX path, while splicing the TX path | |
726 | * should block so it won't put more packets onto pending. | |
727 | */ | |
728 | spin_lock_bh(&sta->lock); | |
729 | ||
3a25a8c8 | 730 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 731 | /* |
a622ab72 JB |
732 | * Now mark as operational. This will be visible |
733 | * in the TX path, and lets it go lock-free in | |
734 | * the common case. | |
cd8ffc80 | 735 | */ |
40b275b6 | 736 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 737 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 738 | |
cfcdbde3 | 739 | spin_unlock_bh(&sta->lock); |
ba8c3d6f FF |
740 | |
741 | ieee80211_agg_start_txq(sta, tid, true); | |
b1720231 JB |
742 | } |
743 | ||
7a7c0a64 JB |
744 | void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, |
745 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 746 | { |
7a7c0a64 | 747 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c951ad35 | 748 | struct ieee80211_local *local = sdata->local; |
b8695a8f | 749 | |
7a7c0a64 JB |
750 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
751 | return; | |
752 | ||
753 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) | |
754 | ieee80211_agg_tx_operational(local, sta, tid); | |
755 | } | |
756 | ||
757 | static struct tid_ampdu_tx * | |
758 | ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata, | |
759 | const u8 *ra, u16 tid, struct sta_info **sta) | |
760 | { | |
761 | struct tid_ampdu_tx *tid_tx; | |
b5878a2d | 762 | |
5a306f58 | 763 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 764 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 765 | tid, IEEE80211_NUM_TIDS); |
7a7c0a64 | 766 | return NULL; |
b8695a8f JB |
767 | } |
768 | ||
7a7c0a64 JB |
769 | *sta = sta_info_get_bss(sdata, ra); |
770 | if (!*sta) { | |
bdcbd8e0 | 771 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
7a7c0a64 | 772 | return NULL; |
b8695a8f JB |
773 | } |
774 | ||
7a7c0a64 | 775 | tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]); |
b8695a8f | 776 | |
7a7c0a64 | 777 | if (WARN_ON(!tid_tx)) |
bdcbd8e0 | 778 | ht_dbg(sdata, "addBA was not requested!\n"); |
96f5e66e | 779 | |
7a7c0a64 | 780 | return tid_tx; |
b8695a8f | 781 | } |
b8695a8f | 782 | |
c951ad35 | 783 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
784 | const u8 *ra, u16 tid) |
785 | { | |
c951ad35 JB |
786 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
787 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
788 | struct sta_info *sta; |
789 | struct tid_ampdu_tx *tid_tx; | |
86ab6c5a | 790 | |
7a7c0a64 | 791 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 792 | |
7a7c0a64 JB |
793 | rcu_read_lock(); |
794 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
795 | if (!tid_tx) | |
796 | goto out; | |
86ab6c5a | 797 | |
7a7c0a64 JB |
798 | set_bit(HT_AGG_STATE_START_CB, &tid_tx->state); |
799 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
800 | out: | |
801 | rcu_read_unlock(); | |
86ab6c5a JB |
802 | } |
803 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
804 | ||
849b7967 | 805 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 806 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 807 | { |
849b7967 JB |
808 | int ret; |
809 | ||
cfcdbde3 | 810 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 811 | |
c82c4a80 | 812 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 813 | |
cfcdbde3 JB |
814 | mutex_unlock(&sta->ampdu_mlme.mtx); |
815 | ||
849b7967 JB |
816 | return ret; |
817 | } | |
b8695a8f | 818 | |
6a8579d0 | 819 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 820 | { |
c951ad35 JB |
821 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
822 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
823 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
824 | struct tid_ampdu_tx *tid_tx; |
825 | int ret = 0; | |
b8695a8f | 826 | |
6a8579d0 | 827 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 828 | |
4253119a | 829 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
830 | return -EINVAL; |
831 | ||
5a306f58 | 832 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
833 | return -EINVAL; |
834 | ||
0ab33703 | 835 | spin_lock_bh(&sta->lock); |
40b275b6 | 836 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
837 | |
838 | if (!tid_tx) { | |
839 | ret = -ENOENT; | |
840 | goto unlock; | |
841 | } | |
842 | ||
b6da911b LK |
843 | WARN(sta->reserved_tid == tid, |
844 | "Requested to stop BA session on reserved tid=%d", tid); | |
845 | ||
0ab33703 JB |
846 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
847 | /* already in progress stopping it */ | |
848 | ret = 0; | |
849 | goto unlock; | |
850 | } | |
851 | ||
852 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
853 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
854 | ||
855 | unlock: | |
856 | spin_unlock_bh(&sta->lock); | |
857 | return ret; | |
b8695a8f JB |
858 | } |
859 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
860 | ||
7a7c0a64 JB |
861 | void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, |
862 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 863 | { |
7a7c0a64 | 864 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
2c158887 | 865 | bool send_delba = false; |
b8695a8f | 866 | |
7a7c0a64 JB |
867 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", |
868 | sta->sta.addr, tid); | |
b8695a8f | 869 | |
a622ab72 | 870 | spin_lock_bh(&sta->lock); |
a622ab72 | 871 | |
7a7c0a64 | 872 | if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
0a214d3f JB |
873 | ht_dbg(sdata, |
874 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
875 | sta->sta.addr, tid); | |
cfcdbde3 | 876 | goto unlock_sta; |
b8695a8f JB |
877 | } |
878 | ||
53f73c09 | 879 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 880 | send_delba = true; |
b8695a8f | 881 | |
faec12ee | 882 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 883 | |
cfcdbde3 | 884 | unlock_sta: |
a622ab72 | 885 | spin_unlock_bh(&sta->lock); |
2c158887 JB |
886 | |
887 | if (send_delba) | |
7a7c0a64 | 888 | ieee80211_send_delba(sdata, sta->sta.addr, tid, |
2c158887 | 889 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
b8695a8f | 890 | } |
b8695a8f | 891 | |
c951ad35 | 892 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
893 | const u8 *ra, u16 tid) |
894 | { | |
c951ad35 JB |
895 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
896 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
897 | struct sta_info *sta; |
898 | struct tid_ampdu_tx *tid_tx; | |
b8695a8f | 899 | |
7a7c0a64 | 900 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 901 | |
7a7c0a64 JB |
902 | rcu_read_lock(); |
903 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
904 | if (!tid_tx) | |
905 | goto out; | |
b8695a8f | 906 | |
7a7c0a64 JB |
907 | set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state); |
908 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
909 | out: | |
910 | rcu_read_unlock(); | |
b8695a8f JB |
911 | } |
912 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
913 | ||
86ab6c5a | 914 | |
b8695a8f JB |
915 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
916 | struct sta_info *sta, | |
917 | struct ieee80211_mgmt *mgmt, | |
918 | size_t len) | |
919 | { | |
a622ab72 | 920 | struct tid_ampdu_tx *tid_tx; |
6e0456b5 | 921 | struct ieee80211_txq *txq; |
41cbb0f5 | 922 | u16 capab, tid, buf_size; |
e3abc8ff | 923 | bool amsdu; |
b8695a8f JB |
924 | |
925 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
e3abc8ff | 926 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
b8695a8f | 927 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
0b01f030 | 928 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
ac062197 | 929 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
b8695a8f | 930 | |
6e0456b5 FF |
931 | txq = sta->sta.txq[tid]; |
932 | if (!amsdu && txq) | |
933 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); | |
934 | ||
cfcdbde3 | 935 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 936 | |
40b275b6 | 937 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 938 | if (!tid_tx) |
8ade0082 | 939 | goto out; |
b8695a8f | 940 | |
a622ab72 | 941 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
942 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
943 | sta->sta.addr, tid); | |
8ade0082 | 944 | goto out; |
b8695a8f JB |
945 | } |
946 | ||
d305a655 | 947 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 948 | |
0a214d3f JB |
949 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
950 | sta->sta.addr, tid); | |
d305a655 NM |
951 | |
952 | /* | |
953 | * addba_resp_timer may have fired before we got here, and | |
954 | * caused WANT_STOP to be set. If the stop then was already | |
955 | * processed further, STOPPING might be set. | |
956 | */ | |
957 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
958 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 959 | ht_dbg(sta->sdata, |
0a214d3f JB |
960 | "got addBA resp for %pM tid %d but we already gave up\n", |
961 | sta->sta.addr, tid); | |
d305a655 NM |
962 | goto out; |
963 | } | |
964 | ||
3ca97880 HS |
965 | /* |
966 | * IEEE 802.11-2007 7.3.1.14: | |
967 | * In an ADDBA Response frame, when the Status Code field | |
968 | * is set to 0, the Buffer Size subfield is set to a value | |
969 | * of at least 1. | |
970 | */ | |
b8695a8f | 971 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 972 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
973 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
974 | &tid_tx->state)) { | |
975 | /* ignore duplicate response */ | |
976 | goto out; | |
977 | } | |
b8695a8f | 978 | |
0b01f030 | 979 | tid_tx->buf_size = buf_size; |
e3abc8ff | 980 | tid_tx->amsdu = amsdu; |
0b01f030 | 981 | |
a622ab72 | 982 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 983 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 984 | |
b1720231 | 985 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 986 | |
914eac24 SS |
987 | tid_tx->timeout = |
988 | le16_to_cpu(mgmt->u.action.u.addba_resp.timeout); | |
989 | ||
12d3952f | 990 | if (tid_tx->timeout) { |
285fa695 NM |
991 | mod_timer(&tid_tx->session_timer, |
992 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
993 | tid_tx->last_tx = jiffies; |
994 | } | |
285fa695 | 995 | |
b8695a8f | 996 | } else { |
c82c4a80 | 997 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 998 | } |
2171abc5 | 999 | |
2171abc5 | 1000 | out: |
cfcdbde3 | 1001 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 1002 | } |