Commit | Line | Data |
---|---|---|
b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
50ea05ef | 10 | * Copyright(c) 2015 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 JB |
78 | skb_reserve(skb, local->hw.extra_tx_headroom); |
79 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
80 | memset(mgmt, 0, 24); | |
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 JB |
127 | skb_reserve(skb, local->hw.extra_tx_headroom); |
128 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
129 | memset(bar, 0, sizeof(*bar)); | |
130 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
131 | IEEE80211_STYPE_BACK_REQ); | |
132 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 133 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
134 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
135 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 136 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
137 | bar->control = cpu_to_le16(bar_control); |
138 | bar->start_seq_num = cpu_to_le16(ssn); | |
139 | ||
2f7916f8 CL |
140 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
141 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
cf6bb79a | 142 | ieee80211_tx_skb_tid(sdata, skb, tid); |
b8695a8f | 143 | } |
8c771244 | 144 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 145 | |
ec034b20 JB |
146 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
147 | struct tid_ampdu_tx *tid_tx) | |
148 | { | |
149 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
150 | lockdep_assert_held(&sta->lock); | |
151 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
152 | } | |
153 | ||
30bf5f1f JB |
154 | /* |
155 | * When multiple aggregation sessions on multiple stations | |
156 | * are being created/destroyed simultaneously, we need to | |
157 | * refcount the global queue stop caused by that in order | |
158 | * to not get into a situation where one of the aggregation | |
159 | * setup or teardown re-enables queues before the other is | |
160 | * ready to handle that. | |
161 | * | |
162 | * These two functions take care of this issue by keeping | |
163 | * a global "agg_queue_stop" refcount. | |
164 | */ | |
165 | static void __acquires(agg_queue) | |
166 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
167 | { | |
168 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
169 | ||
cca07b00 LC |
170 | /* we do refcounting here, so don't use the queue reason refcounting */ |
171 | ||
30bf5f1f JB |
172 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
173 | ieee80211_stop_queue_by_reason( | |
174 | &sdata->local->hw, queue, | |
cca07b00 LC |
175 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
176 | false); | |
30bf5f1f JB |
177 | __acquire(agg_queue); |
178 | } | |
179 | ||
180 | static void __releases(agg_queue) | |
181 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
182 | { | |
183 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
184 | ||
185 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) | |
186 | ieee80211_wake_queue_by_reason( | |
187 | &sdata->local->hw, queue, | |
cca07b00 LC |
188 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
189 | false); | |
30bf5f1f JB |
190 | __release(agg_queue); |
191 | } | |
192 | ||
ba8c3d6f FF |
193 | static void |
194 | ieee80211_agg_stop_txq(struct sta_info *sta, int tid) | |
195 | { | |
196 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
fa962b92 MK |
197 | struct ieee80211_sub_if_data *sdata; |
198 | struct fq *fq; | |
ba8c3d6f FF |
199 | struct txq_info *txqi; |
200 | ||
201 | if (!txq) | |
202 | return; | |
203 | ||
204 | txqi = to_txq_info(txq); | |
fa962b92 MK |
205 | sdata = vif_to_sdata(txq->vif); |
206 | fq = &sdata->local->fq; | |
ba8c3d6f FF |
207 | |
208 | /* Lock here to protect against further seqno updates on dequeue */ | |
fa962b92 | 209 | spin_lock_bh(&fq->lock); |
ba8c3d6f | 210 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
fa962b92 | 211 | spin_unlock_bh(&fq->lock); |
ba8c3d6f FF |
212 | } |
213 | ||
214 | static void | |
215 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) | |
216 | { | |
217 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
218 | struct txq_info *txqi; | |
219 | ||
220 | if (!txq) | |
221 | return; | |
222 | ||
223 | txqi = to_txq_info(txq); | |
224 | ||
225 | if (enable) | |
226 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
227 | else | |
228 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
229 | ||
230 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
231 | drv_wake_tx_queue(sta->sdata->local, txqi); | |
232 | } | |
233 | ||
30bf5f1f JB |
234 | /* |
235 | * splice packets from the STA's pending to the local pending, | |
236 | * requires a call to ieee80211_agg_splice_finish later | |
237 | */ | |
238 | static void __acquires(agg_queue) | |
239 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
240 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
241 | { | |
242 | struct ieee80211_local *local = sdata->local; | |
243 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
244 | unsigned long flags; | |
245 | ||
246 | ieee80211_stop_queue_agg(sdata, tid); | |
247 | ||
248 | if (WARN(!tid_tx, | |
249 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
250 | tid)) | |
251 | return; | |
252 | ||
253 | if (!skb_queue_empty(&tid_tx->pending)) { | |
254 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
255 | /* copy over remaining packets */ | |
256 | skb_queue_splice_tail_init(&tid_tx->pending, | |
257 | &local->pending[queue]); | |
258 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
259 | } | |
260 | } | |
261 | ||
262 | static void __releases(agg_queue) | |
263 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
264 | { | |
265 | ieee80211_wake_queue_agg(sdata, tid); | |
266 | } | |
267 | ||
268 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
269 | { | |
270 | struct tid_ampdu_tx *tid_tx; | |
271 | ||
272 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
273 | lockdep_assert_held(&sta->lock); | |
274 | ||
275 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
276 | ||
277 | /* | |
278 | * When we get here, the TX path will not be lockless any more wrt. | |
279 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
280 | * Thus it will block on getting the lock, if it occurs. So if we | |
281 | * stop the queue now, we will not get any more packets, and any | |
282 | * that might be being processed will wait for us here, thereby | |
283 | * guaranteeing that no packets go to the tid_tx pending queue any | |
284 | * more. | |
285 | */ | |
286 | ||
287 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
288 | ||
289 | /* future packets must not find the tid_tx struct any more */ | |
290 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
291 | ||
292 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
ba8c3d6f | 293 | ieee80211_agg_start_txq(sta, tid, false); |
30bf5f1f JB |
294 | |
295 | kfree_rcu(tid_tx, rcu_head); | |
296 | } | |
297 | ||
67c282c0 | 298 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 299 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 300 | { |
849b7967 | 301 | struct ieee80211_local *local = sta->local; |
40b275b6 | 302 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
303 | struct ieee80211_ampdu_params params = { |
304 | .sta = &sta->sta, | |
305 | .tid = tid, | |
306 | .buf_size = 0, | |
307 | .amsdu = false, | |
308 | .timeout = 0, | |
309 | .ssn = 0, | |
310 | }; | |
23e6a7ea | 311 | int ret; |
a622ab72 | 312 | |
cfcdbde3 | 313 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 314 | |
18b559d5 JB |
315 | switch (reason) { |
316 | case AGG_STOP_DECLINED: | |
317 | case AGG_STOP_LOCAL_REQUEST: | |
318 | case AGG_STOP_PEER_REQUEST: | |
50ea05ef | 319 | params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
18b559d5 JB |
320 | break; |
321 | case AGG_STOP_DESTROY_STA: | |
50ea05ef | 322 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
18b559d5 JB |
323 | break; |
324 | default: | |
325 | WARN_ON_ONCE(1); | |
326 | return -EINVAL; | |
327 | } | |
328 | ||
cfcdbde3 JB |
329 | spin_lock_bh(&sta->lock); |
330 | ||
40b275b6 JB |
331 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
332 | if (!tid_tx) { | |
333 | spin_unlock_bh(&sta->lock); | |
334 | return -ENOENT; | |
335 | } | |
336 | ||
18b559d5 JB |
337 | /* |
338 | * if we're already stopping ignore any new requests to stop | |
339 | * unless we're destroying it in which case notify the driver | |
340 | */ | |
24f50a9d JB |
341 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
342 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
343 | if (reason != AGG_STOP_DESTROY_STA) |
344 | return -EALREADY; | |
50ea05ef SS |
345 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
346 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); | |
18b559d5 | 347 | WARN_ON_ONCE(ret); |
8147dc7f | 348 | return 0; |
24f50a9d JB |
349 | } |
350 | ||
0ab33703 JB |
351 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
352 | /* not even started yet! */ | |
ec034b20 | 353 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 354 | spin_unlock_bh(&sta->lock); |
0744371a | 355 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
356 | return 0; |
357 | } | |
358 | ||
24f50a9d JB |
359 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
360 | ||
cfcdbde3 JB |
361 | spin_unlock_bh(&sta->lock); |
362 | ||
bdcbd8e0 JB |
363 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
364 | sta->sta.addr, tid); | |
827d42c9 | 365 | |
44271488 | 366 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 367 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 368 | |
a622ab72 JB |
369 | /* |
370 | * After this packets are no longer handed right through | |
371 | * to the driver but are put onto tid_tx->pending instead, | |
372 | * with locking to ensure proper access. | |
373 | */ | |
374 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 375 | |
2a1e0fd1 EG |
376 | /* |
377 | * There might be a few packets being processed right now (on | |
378 | * another CPU) that have already gotten past the aggregation | |
379 | * check when it was still OPERATIONAL and consequently have | |
380 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
381 | * call into the driver at the same time or even before the | |
382 | * TX paths calls into it, which could confuse the driver. | |
383 | * | |
384 | * Wait for all currently running TX paths to finish before | |
385 | * telling the driver. New packets will not go through since | |
386 | * the aggregation session is no longer OPERATIONAL. | |
387 | */ | |
388 | synchronize_net(); | |
389 | ||
c82c4a80 JB |
390 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
391 | WLAN_BACK_RECIPIENT : | |
392 | WLAN_BACK_INITIATOR; | |
393 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 394 | |
50ea05ef | 395 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
23e6a7ea JB |
396 | |
397 | /* HW shall not deny going back to legacy */ | |
398 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
399 | /* |
400 | * We may have pending packets get stuck in this case... | |
401 | * Not bothering with a workaround for now. | |
402 | */ | |
23e6a7ea JB |
403 | } |
404 | ||
8147dc7f JB |
405 | /* |
406 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
407 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
408 | * seem like we can leave the tid_tx data pending forever. | |
409 | * This is true, in a way, but "forever" is only until the | |
410 | * station struct is actually destroyed. In the meantime, | |
411 | * leaving it around ensures that we don't transmit packets | |
412 | * to the driver on this TID which might confuse it. | |
413 | */ | |
18b559d5 JB |
414 | |
415 | return 0; | |
23e6a7ea JB |
416 | } |
417 | ||
b8695a8f JB |
418 | /* |
419 | * After sending add Block Ack request we activated a timer until | |
420 | * add Block Ack response will arrive from the recipient. | |
421 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
422 | */ | |
423 | static void sta_addba_resp_timer_expired(unsigned long data) | |
424 | { | |
425 | /* not an elegant detour, but there is no choice as the timer passes | |
426 | * only one argument, and both sta_info and TID are needed, so init | |
427 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
428 | * array gives the sta through container_of */ | |
429 | u16 tid = *(u8 *)data; | |
23e6a7ea | 430 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 431 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 432 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 433 | |
b8695a8f | 434 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
435 | rcu_read_lock(); |
436 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
437 | if (!tid_tx || |
438 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 439 | rcu_read_unlock(); |
bdcbd8e0 | 440 | ht_dbg(sta->sdata, |
0a214d3f JB |
441 | "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n", |
442 | sta->sta.addr, tid); | |
23e6a7ea | 443 | return; |
b8695a8f JB |
444 | } |
445 | ||
0a214d3f JB |
446 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
447 | sta->sta.addr, tid); | |
b8695a8f | 448 | |
83a5cbf7 JB |
449 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
450 | rcu_read_unlock(); | |
b8695a8f JB |
451 | } |
452 | ||
67c282c0 | 453 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 454 | { |
40b275b6 | 455 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
456 | struct ieee80211_local *local = sta->local; |
457 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
50ea05ef SS |
458 | struct ieee80211_ampdu_params params = { |
459 | .sta = &sta->sta, | |
460 | .action = IEEE80211_AMPDU_TX_START, | |
461 | .tid = tid, | |
462 | .buf_size = 0, | |
463 | .amsdu = false, | |
464 | .timeout = 0, | |
465 | }; | |
0ab33703 JB |
466 | int ret; |
467 | ||
40b275b6 | 468 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 469 | |
0ab33703 | 470 | /* |
15062e6a JB |
471 | * Start queuing up packets for this aggregation session. |
472 | * We're going to release them once the driver is OK with | |
473 | * that. | |
0ab33703 | 474 | */ |
0ab33703 JB |
475 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
476 | ||
ba8c3d6f FF |
477 | ieee80211_agg_stop_txq(sta, tid); |
478 | ||
0ab33703 | 479 | /* |
15062e6a JB |
480 | * Make sure no packets are being processed. This ensures that |
481 | * we have a valid starting sequence number and that in-flight | |
482 | * packets have been flushed out and no packets for this TID | |
483 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 484 | */ |
cfcdbde3 JB |
485 | synchronize_net(); |
486 | ||
50ea05ef SS |
487 | params.ssn = sta->tid_seq[tid] >> 4; |
488 | ret = drv_ampdu_action(local, sdata, ¶ms); | |
0ab33703 | 489 | if (ret) { |
bdcbd8e0 | 490 | ht_dbg(sdata, |
0a214d3f JB |
491 | "BA request denied - HW unavailable for %pM tid %d\n", |
492 | sta->sta.addr, tid); | |
cfcdbde3 | 493 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 494 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 495 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 496 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
497 | spin_unlock_bh(&sta->lock); |
498 | ||
ba8c3d6f FF |
499 | ieee80211_agg_start_txq(sta, tid, false); |
500 | ||
0744371a | 501 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
502 | return; |
503 | } | |
504 | ||
0ab33703 JB |
505 | /* activate the timer for the recipient's addBA response */ |
506 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
0a214d3f JB |
507 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
508 | sta->sta.addr, tid); | |
0ab33703 | 509 | |
cfcdbde3 | 510 | spin_lock_bh(&sta->lock); |
84381b4e | 511 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 512 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 513 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
514 | |
515 | /* send AddBA request */ | |
516 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
50ea05ef | 517 | tid_tx->dialog_token, params.ssn, |
ac062197 | 518 | IEEE80211_MAX_AMPDU_BUF, |
5dd36bc9 | 519 | tid_tx->timeout); |
0ab33703 JB |
520 | } |
521 | ||
285fa695 NM |
522 | /* |
523 | * After accepting the AddBA Response we activated a timer, | |
524 | * resetting it after each frame that we send. | |
525 | */ | |
526 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
527 | { | |
528 | /* not an elegant detour, but there is no choice as the timer passes | |
529 | * only one argument, and various sta_info are needed here, so init | |
530 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
531 | * array gives the sta through container_of */ | |
532 | u8 *ptid = (u8 *)data; | |
533 | u8 *timer_to_id = ptid - *ptid; | |
534 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
535 | timer_to_tid[0]); | |
12d3952f FF |
536 | struct tid_ampdu_tx *tid_tx; |
537 | unsigned long timeout; | |
538 | ||
9e73dee7 JB |
539 | rcu_read_lock(); |
540 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
541 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
542 | rcu_read_unlock(); | |
12d3952f | 543 | return; |
9e73dee7 | 544 | } |
12d3952f FF |
545 | |
546 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
547 | if (time_is_after_jiffies(timeout)) { | |
548 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 549 | rcu_read_unlock(); |
12d3952f FF |
550 | return; |
551 | } | |
285fa695 | 552 | |
9e73dee7 JB |
553 | rcu_read_unlock(); |
554 | ||
0a214d3f JB |
555 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
556 | sta->sta.addr, (u16)*ptid); | |
285fa695 NM |
557 | |
558 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
559 | } | |
560 | ||
bd2ce6e4 SM |
561 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
562 | u16 timeout) | |
b8695a8f | 563 | { |
c951ad35 JB |
564 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
565 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
566 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 567 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 568 | int ret = 0; |
b8695a8f | 569 | |
8f9c77fc JB |
570 | trace_api_start_tx_ba_session(pubsta, tid); |
571 | ||
b6da911b LK |
572 | if (WARN(sta->reserved_tid == tid, |
573 | "Requested to start BA session on reserved tid=%d", tid)) | |
574 | return -EINVAL; | |
575 | ||
8f9c77fc JB |
576 | if (!pubsta->ht_cap.ht_supported) |
577 | return -EINVAL; | |
b5878a2d | 578 | |
50c16e22 | 579 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
580 | return -EINVAL; |
581 | ||
5a306f58 | 582 | if ((tid >= IEEE80211_NUM_TIDS) || |
30686bf7 JB |
583 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
584 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
585 | return -EINVAL; |
586 | ||
bdcbd8e0 JB |
587 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
588 | pubsta->addr, tid); | |
b8695a8f | 589 | |
c951ad35 | 590 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 591 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 592 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
593 | sdata->vif.type != NL80211_IFTYPE_AP && |
594 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 595 | return -EINVAL; |
8abd3f9b | 596 | |
c2c98fde | 597 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 598 | ht_dbg(sdata, |
0a214d3f JB |
599 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
600 | sta->sta.addr, tid); | |
c951ad35 | 601 | return -EINVAL; |
722f069a S |
602 | } |
603 | ||
ff3cc5f4 SW |
604 | /* |
605 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
606 | * member of an IBSS, and has no other existing Block Ack agreement | |
607 | * with the recipient STA, then the initiating STA shall transmit a | |
608 | * Probe Request frame to the recipient STA and shall not transmit an | |
609 | * ADDBA Request frame unless it receives a Probe Response frame | |
610 | * from the recipient within dot11ADDBAFailureTimeout. | |
611 | * | |
612 | * The probe request mechanism for ADDBA is currently not implemented, | |
613 | * but we only build up Block Ack session with HT STAs. This information | |
614 | * is set when we receive a bss info from a probe response or a beacon. | |
615 | */ | |
616 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
617 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
618 | ht_dbg(sdata, |
619 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
620 | pubsta->addr); | |
ff3cc5f4 SW |
621 | return -EINVAL; |
622 | } | |
623 | ||
b8695a8f JB |
624 | spin_lock_bh(&sta->lock); |
625 | ||
626 | /* we have tried too many times, receiver does not want A-MPDU */ | |
627 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
628 | ret = -EBUSY; | |
84381b4e NM |
629 | goto err_unlock_sta; |
630 | } | |
631 | ||
632 | /* | |
633 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
634 | * will spread our requests in time to avoid stalling connection | |
635 | * for too long | |
636 | */ | |
637 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
638 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
639 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 640 | ht_dbg(sdata, |
0a214d3f JB |
641 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
642 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); | |
84381b4e | 643 | ret = -EBUSY; |
b8695a8f JB |
644 | goto err_unlock_sta; |
645 | } | |
646 | ||
40b275b6 | 647 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 648 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 649 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 650 | ht_dbg(sdata, |
0a214d3f JB |
651 | "BA request denied - session is not idle on %pM tid %u\n", |
652 | sta->sta.addr, tid); | |
b8695a8f JB |
653 | ret = -EAGAIN; |
654 | goto err_unlock_sta; | |
655 | } | |
656 | ||
657 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
658 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
659 | if (!tid_tx) { | |
b8695a8f | 660 | ret = -ENOMEM; |
0ab33703 | 661 | goto err_unlock_sta; |
b8695a8f | 662 | } |
96f5e66e | 663 | |
a622ab72 | 664 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 665 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 666 | |
bd2ce6e4 SM |
667 | tid_tx->timeout = timeout; |
668 | ||
285fa695 | 669 | /* response timer */ |
a622ab72 JB |
670 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
671 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
672 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 673 | |
285fa695 NM |
674 | /* tx timer */ |
675 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
676 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 677 | init_timer_deferrable(&tid_tx->session_timer); |
285fa695 | 678 | |
0ab33703 | 679 | /* assign a dialog token */ |
b8695a8f | 680 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 681 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 682 | |
ec034b20 JB |
683 | /* |
684 | * Finally, assign it to the start array; the work item will | |
685 | * collect it and move it to the normal array. | |
686 | */ | |
687 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 688 | |
0ab33703 | 689 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 690 | |
0ab33703 | 691 | /* this flow continues off the work */ |
96f5e66e | 692 | err_unlock_sta: |
b8695a8f | 693 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
694 | return ret; |
695 | } | |
696 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
697 | ||
b1720231 JB |
698 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
699 | struct sta_info *sta, u16 tid) | |
700 | { | |
40b275b6 | 701 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
702 | struct ieee80211_ampdu_params params = { |
703 | .sta = &sta->sta, | |
704 | .action = IEEE80211_AMPDU_TX_OPERATIONAL, | |
705 | .tid = tid, | |
706 | .timeout = 0, | |
707 | .ssn = 0, | |
708 | }; | |
40b275b6 | 709 | |
cfcdbde3 | 710 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 711 | |
40b275b6 | 712 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
50ea05ef SS |
713 | params.buf_size = tid_tx->buf_size; |
714 | params.amsdu = tid_tx->amsdu; | |
40b275b6 | 715 | |
0a214d3f JB |
716 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
717 | sta->sta.addr, tid); | |
b1720231 | 718 | |
50ea05ef | 719 | drv_ampdu_action(local, sta->sdata, ¶ms); |
cfcdbde3 JB |
720 | |
721 | /* | |
722 | * synchronize with TX path, while splicing the TX path | |
723 | * should block so it won't put more packets onto pending. | |
724 | */ | |
725 | spin_lock_bh(&sta->lock); | |
726 | ||
3a25a8c8 | 727 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 728 | /* |
a622ab72 JB |
729 | * Now mark as operational. This will be visible |
730 | * in the TX path, and lets it go lock-free in | |
731 | * the common case. | |
cd8ffc80 | 732 | */ |
40b275b6 | 733 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 734 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 735 | |
cfcdbde3 | 736 | spin_unlock_bh(&sta->lock); |
ba8c3d6f FF |
737 | |
738 | ieee80211_agg_start_txq(sta, tid, true); | |
b1720231 JB |
739 | } |
740 | ||
c951ad35 | 741 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 742 | { |
c951ad35 JB |
743 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
744 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 745 | struct sta_info *sta; |
a622ab72 | 746 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 747 | |
b5878a2d JB |
748 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
749 | ||
5a306f58 | 750 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 751 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 752 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
753 | return; |
754 | } | |
755 | ||
cfcdbde3 | 756 | mutex_lock(&local->sta_mtx); |
bc192f89 | 757 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 758 | if (!sta) { |
cfcdbde3 | 759 | mutex_unlock(&local->sta_mtx); |
bdcbd8e0 | 760 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
b8695a8f JB |
761 | return; |
762 | } | |
763 | ||
cfcdbde3 | 764 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 765 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 766 | |
a622ab72 | 767 | if (WARN_ON(!tid_tx)) { |
bdcbd8e0 | 768 | ht_dbg(sdata, "addBA was not requested!\n"); |
cfcdbde3 | 769 | goto unlock; |
b8695a8f JB |
770 | } |
771 | ||
a622ab72 | 772 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 773 | goto unlock; |
b8695a8f | 774 | |
a622ab72 | 775 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 776 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 777 | |
cfcdbde3 JB |
778 | unlock: |
779 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
780 | mutex_unlock(&local->sta_mtx); | |
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; | |
86ab6c5a JB |
788 | struct ieee80211_ra_tid *ra_tid; |
789 | struct sk_buff *skb = dev_alloc_skb(0); | |
790 | ||
d15b8459 | 791 | if (unlikely(!skb)) |
86ab6c5a | 792 | return; |
d15b8459 | 793 | |
86ab6c5a JB |
794 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
795 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
796 | ra_tid->tid = tid; | |
797 | ||
c1475ca9 JB |
798 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
799 | skb_queue_tail(&sdata->skb_queue, skb); | |
800 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
801 | } |
802 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
803 | ||
849b7967 | 804 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 805 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 806 | { |
849b7967 JB |
807 | int ret; |
808 | ||
cfcdbde3 | 809 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 810 | |
c82c4a80 | 811 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 812 | |
cfcdbde3 JB |
813 | mutex_unlock(&sta->ampdu_mlme.mtx); |
814 | ||
849b7967 JB |
815 | return ret; |
816 | } | |
b8695a8f | 817 | |
6a8579d0 | 818 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 819 | { |
c951ad35 JB |
820 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
821 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
822 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
823 | struct tid_ampdu_tx *tid_tx; |
824 | int ret = 0; | |
b8695a8f | 825 | |
6a8579d0 | 826 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 827 | |
4253119a | 828 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
829 | return -EINVAL; |
830 | ||
5a306f58 | 831 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
832 | return -EINVAL; |
833 | ||
0ab33703 | 834 | spin_lock_bh(&sta->lock); |
40b275b6 | 835 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
836 | |
837 | if (!tid_tx) { | |
838 | ret = -ENOENT; | |
839 | goto unlock; | |
840 | } | |
841 | ||
b6da911b LK |
842 | WARN(sta->reserved_tid == tid, |
843 | "Requested to stop BA session on reserved tid=%d", tid); | |
844 | ||
0ab33703 JB |
845 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
846 | /* already in progress stopping it */ | |
847 | ret = 0; | |
848 | goto unlock; | |
849 | } | |
850 | ||
851 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
852 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
853 | ||
854 | unlock: | |
855 | spin_unlock_bh(&sta->lock); | |
856 | return ret; | |
b8695a8f JB |
857 | } |
858 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
859 | ||
c951ad35 | 860 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 861 | { |
c951ad35 JB |
862 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
863 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 864 | struct sta_info *sta; |
a622ab72 | 865 | struct tid_ampdu_tx *tid_tx; |
2c158887 | 866 | bool send_delba = false; |
b8695a8f | 867 | |
b5878a2d JB |
868 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
869 | ||
5a306f58 | 870 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 871 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 872 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
873 | return; |
874 | } | |
875 | ||
bdcbd8e0 | 876 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 877 | |
cfcdbde3 JB |
878 | mutex_lock(&local->sta_mtx); |
879 | ||
bc192f89 | 880 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 881 | if (!sta) { |
bdcbd8e0 | 882 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
cfcdbde3 | 883 | goto unlock; |
b8695a8f | 884 | } |
b8695a8f | 885 | |
cfcdbde3 | 886 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 887 | spin_lock_bh(&sta->lock); |
40b275b6 | 888 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
889 | |
890 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
0a214d3f JB |
891 | ht_dbg(sdata, |
892 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
893 | sta->sta.addr, tid); | |
cfcdbde3 | 894 | goto unlock_sta; |
b8695a8f JB |
895 | } |
896 | ||
53f73c09 | 897 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 898 | send_delba = true; |
b8695a8f | 899 | |
faec12ee | 900 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 901 | |
cfcdbde3 | 902 | unlock_sta: |
a622ab72 | 903 | spin_unlock_bh(&sta->lock); |
2c158887 JB |
904 | |
905 | if (send_delba) | |
906 | ieee80211_send_delba(sdata, ra, tid, | |
907 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
908 | ||
cfcdbde3 JB |
909 | mutex_unlock(&sta->ampdu_mlme.mtx); |
910 | unlock: | |
911 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 912 | } |
b8695a8f | 913 | |
c951ad35 | 914 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
915 | const u8 *ra, u16 tid) |
916 | { | |
c951ad35 JB |
917 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
918 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
919 | struct ieee80211_ra_tid *ra_tid; |
920 | struct sk_buff *skb = dev_alloc_skb(0); | |
921 | ||
d15b8459 | 922 | if (unlikely(!skb)) |
b8695a8f | 923 | return; |
d15b8459 | 924 | |
b8695a8f JB |
925 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
926 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
927 | ra_tid->tid = tid; | |
928 | ||
c1475ca9 JB |
929 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
930 | skb_queue_tail(&sdata->skb_queue, skb); | |
931 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
932 | } |
933 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
934 | ||
86ab6c5a | 935 | |
b8695a8f JB |
936 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
937 | struct sta_info *sta, | |
938 | struct ieee80211_mgmt *mgmt, | |
939 | size_t len) | |
940 | { | |
a622ab72 | 941 | struct tid_ampdu_tx *tid_tx; |
6e0456b5 | 942 | struct ieee80211_txq *txq; |
b1720231 | 943 | u16 capab, tid; |
0b01f030 | 944 | u8 buf_size; |
e3abc8ff | 945 | bool amsdu; |
b8695a8f JB |
946 | |
947 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
e3abc8ff | 948 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
b8695a8f | 949 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
0b01f030 | 950 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
ac062197 | 951 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
b8695a8f | 952 | |
6e0456b5 FF |
953 | txq = sta->sta.txq[tid]; |
954 | if (!amsdu && txq) | |
955 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); | |
956 | ||
cfcdbde3 | 957 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 958 | |
40b275b6 | 959 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 960 | if (!tid_tx) |
8ade0082 | 961 | goto out; |
b8695a8f | 962 | |
a622ab72 | 963 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
964 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
965 | sta->sta.addr, tid); | |
8ade0082 | 966 | goto out; |
b8695a8f JB |
967 | } |
968 | ||
d305a655 | 969 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 970 | |
0a214d3f JB |
971 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
972 | sta->sta.addr, tid); | |
d305a655 NM |
973 | |
974 | /* | |
975 | * addba_resp_timer may have fired before we got here, and | |
976 | * caused WANT_STOP to be set. If the stop then was already | |
977 | * processed further, STOPPING might be set. | |
978 | */ | |
979 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
980 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 981 | ht_dbg(sta->sdata, |
0a214d3f JB |
982 | "got addBA resp for %pM tid %d but we already gave up\n", |
983 | sta->sta.addr, tid); | |
d305a655 NM |
984 | goto out; |
985 | } | |
986 | ||
3ca97880 HS |
987 | /* |
988 | * IEEE 802.11-2007 7.3.1.14: | |
989 | * In an ADDBA Response frame, when the Status Code field | |
990 | * is set to 0, the Buffer Size subfield is set to a value | |
991 | * of at least 1. | |
992 | */ | |
b8695a8f | 993 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 994 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
995 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
996 | &tid_tx->state)) { | |
997 | /* ignore duplicate response */ | |
998 | goto out; | |
999 | } | |
b8695a8f | 1000 | |
0b01f030 | 1001 | tid_tx->buf_size = buf_size; |
e3abc8ff | 1002 | tid_tx->amsdu = amsdu; |
0b01f030 | 1003 | |
a622ab72 | 1004 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 1005 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 1006 | |
b1720231 | 1007 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 1008 | |
12d3952f | 1009 | if (tid_tx->timeout) { |
285fa695 NM |
1010 | mod_timer(&tid_tx->session_timer, |
1011 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
1012 | tid_tx->last_tx = jiffies; |
1013 | } | |
285fa695 | 1014 | |
b8695a8f | 1015 | } else { |
c82c4a80 | 1016 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 1017 | } |
2171abc5 | 1018 | |
2171abc5 | 1019 | out: |
cfcdbde3 | 1020 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 1021 | } |