]>
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 | ||
85d5313e JB |
587 | if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
588 | return -EINVAL; | |
589 | ||
bdcbd8e0 JB |
590 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
591 | pubsta->addr, tid); | |
b8695a8f | 592 | |
c951ad35 | 593 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 594 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 595 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
596 | sdata->vif.type != NL80211_IFTYPE_AP && |
597 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 598 | return -EINVAL; |
8abd3f9b | 599 | |
c2c98fde | 600 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 601 | ht_dbg(sdata, |
0a214d3f JB |
602 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
603 | sta->sta.addr, tid); | |
c951ad35 | 604 | return -EINVAL; |
722f069a S |
605 | } |
606 | ||
ff3cc5f4 SW |
607 | /* |
608 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
609 | * member of an IBSS, and has no other existing Block Ack agreement | |
610 | * with the recipient STA, then the initiating STA shall transmit a | |
611 | * Probe Request frame to the recipient STA and shall not transmit an | |
612 | * ADDBA Request frame unless it receives a Probe Response frame | |
613 | * from the recipient within dot11ADDBAFailureTimeout. | |
614 | * | |
615 | * The probe request mechanism for ADDBA is currently not implemented, | |
616 | * but we only build up Block Ack session with HT STAs. This information | |
617 | * is set when we receive a bss info from a probe response or a beacon. | |
618 | */ | |
619 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
620 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
621 | ht_dbg(sdata, |
622 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
623 | pubsta->addr); | |
ff3cc5f4 SW |
624 | return -EINVAL; |
625 | } | |
626 | ||
b8695a8f JB |
627 | spin_lock_bh(&sta->lock); |
628 | ||
629 | /* we have tried too many times, receiver does not want A-MPDU */ | |
630 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
631 | ret = -EBUSY; | |
84381b4e NM |
632 | goto err_unlock_sta; |
633 | } | |
634 | ||
635 | /* | |
636 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
637 | * will spread our requests in time to avoid stalling connection | |
638 | * for too long | |
639 | */ | |
640 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
641 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
642 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 643 | ht_dbg(sdata, |
0a214d3f JB |
644 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
645 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); | |
84381b4e | 646 | ret = -EBUSY; |
b8695a8f JB |
647 | goto err_unlock_sta; |
648 | } | |
649 | ||
40b275b6 | 650 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 651 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 652 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 653 | ht_dbg(sdata, |
0a214d3f JB |
654 | "BA request denied - session is not idle on %pM tid %u\n", |
655 | sta->sta.addr, tid); | |
b8695a8f JB |
656 | ret = -EAGAIN; |
657 | goto err_unlock_sta; | |
658 | } | |
659 | ||
660 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
661 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
662 | if (!tid_tx) { | |
b8695a8f | 663 | ret = -ENOMEM; |
0ab33703 | 664 | goto err_unlock_sta; |
b8695a8f | 665 | } |
96f5e66e | 666 | |
a622ab72 | 667 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 668 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 669 | |
bd2ce6e4 SM |
670 | tid_tx->timeout = timeout; |
671 | ||
285fa695 | 672 | /* response timer */ |
a622ab72 JB |
673 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
674 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
675 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 676 | |
285fa695 NM |
677 | /* tx timer */ |
678 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
679 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 680 | init_timer_deferrable(&tid_tx->session_timer); |
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 | ||
c951ad35 | 744 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 745 | { |
c951ad35 JB |
746 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
747 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 748 | struct sta_info *sta; |
a622ab72 | 749 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 750 | |
b5878a2d JB |
751 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
752 | ||
5a306f58 | 753 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 754 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 755 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
756 | return; |
757 | } | |
758 | ||
cfcdbde3 | 759 | mutex_lock(&local->sta_mtx); |
bc192f89 | 760 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 761 | if (!sta) { |
cfcdbde3 | 762 | mutex_unlock(&local->sta_mtx); |
bdcbd8e0 | 763 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
b8695a8f JB |
764 | return; |
765 | } | |
766 | ||
cfcdbde3 | 767 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 768 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 769 | |
a622ab72 | 770 | if (WARN_ON(!tid_tx)) { |
bdcbd8e0 | 771 | ht_dbg(sdata, "addBA was not requested!\n"); |
cfcdbde3 | 772 | goto unlock; |
b8695a8f JB |
773 | } |
774 | ||
a622ab72 | 775 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 776 | goto unlock; |
b8695a8f | 777 | |
a622ab72 | 778 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 779 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 780 | |
cfcdbde3 JB |
781 | unlock: |
782 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
783 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 784 | } |
b8695a8f | 785 | |
c951ad35 | 786 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
787 | const u8 *ra, u16 tid) |
788 | { | |
c951ad35 JB |
789 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
790 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
791 | struct ieee80211_ra_tid *ra_tid; |
792 | struct sk_buff *skb = dev_alloc_skb(0); | |
793 | ||
d15b8459 | 794 | if (unlikely(!skb)) |
86ab6c5a | 795 | return; |
d15b8459 | 796 | |
86ab6c5a JB |
797 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
798 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
799 | ra_tid->tid = tid; | |
800 | ||
c1475ca9 JB |
801 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
802 | skb_queue_tail(&sdata->skb_queue, skb); | |
803 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
804 | } |
805 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
806 | ||
849b7967 | 807 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 808 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 809 | { |
849b7967 JB |
810 | int ret; |
811 | ||
cfcdbde3 | 812 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 813 | |
c82c4a80 | 814 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 815 | |
cfcdbde3 JB |
816 | mutex_unlock(&sta->ampdu_mlme.mtx); |
817 | ||
849b7967 JB |
818 | return ret; |
819 | } | |
b8695a8f | 820 | |
6a8579d0 | 821 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 822 | { |
c951ad35 JB |
823 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
824 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
825 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
826 | struct tid_ampdu_tx *tid_tx; |
827 | int ret = 0; | |
b8695a8f | 828 | |
6a8579d0 | 829 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 830 | |
4253119a | 831 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
832 | return -EINVAL; |
833 | ||
5a306f58 | 834 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
835 | return -EINVAL; |
836 | ||
0ab33703 | 837 | spin_lock_bh(&sta->lock); |
40b275b6 | 838 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
839 | |
840 | if (!tid_tx) { | |
841 | ret = -ENOENT; | |
842 | goto unlock; | |
843 | } | |
844 | ||
b6da911b LK |
845 | WARN(sta->reserved_tid == tid, |
846 | "Requested to stop BA session on reserved tid=%d", tid); | |
847 | ||
0ab33703 JB |
848 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
849 | /* already in progress stopping it */ | |
850 | ret = 0; | |
851 | goto unlock; | |
852 | } | |
853 | ||
854 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
855 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
856 | ||
857 | unlock: | |
858 | spin_unlock_bh(&sta->lock); | |
859 | return ret; | |
b8695a8f JB |
860 | } |
861 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
862 | ||
c951ad35 | 863 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 864 | { |
c951ad35 JB |
865 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
866 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 867 | struct sta_info *sta; |
a622ab72 | 868 | struct tid_ampdu_tx *tid_tx; |
2c158887 | 869 | bool send_delba = false; |
b8695a8f | 870 | |
b5878a2d JB |
871 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
872 | ||
5a306f58 | 873 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 874 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 875 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
876 | return; |
877 | } | |
878 | ||
bdcbd8e0 | 879 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 880 | |
cfcdbde3 JB |
881 | mutex_lock(&local->sta_mtx); |
882 | ||
bc192f89 | 883 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 884 | if (!sta) { |
bdcbd8e0 | 885 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
cfcdbde3 | 886 | goto unlock; |
b8695a8f | 887 | } |
b8695a8f | 888 | |
cfcdbde3 | 889 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 890 | spin_lock_bh(&sta->lock); |
40b275b6 | 891 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
892 | |
893 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
0a214d3f JB |
894 | ht_dbg(sdata, |
895 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
896 | sta->sta.addr, tid); | |
cfcdbde3 | 897 | goto unlock_sta; |
b8695a8f JB |
898 | } |
899 | ||
53f73c09 | 900 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 901 | send_delba = true; |
b8695a8f | 902 | |
faec12ee | 903 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 904 | |
cfcdbde3 | 905 | unlock_sta: |
a622ab72 | 906 | spin_unlock_bh(&sta->lock); |
2c158887 JB |
907 | |
908 | if (send_delba) | |
909 | ieee80211_send_delba(sdata, ra, tid, | |
910 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
911 | ||
cfcdbde3 JB |
912 | mutex_unlock(&sta->ampdu_mlme.mtx); |
913 | unlock: | |
914 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 915 | } |
b8695a8f | 916 | |
c951ad35 | 917 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
918 | const u8 *ra, u16 tid) |
919 | { | |
c951ad35 JB |
920 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
921 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
922 | struct ieee80211_ra_tid *ra_tid; |
923 | struct sk_buff *skb = dev_alloc_skb(0); | |
924 | ||
d15b8459 | 925 | if (unlikely(!skb)) |
b8695a8f | 926 | return; |
d15b8459 | 927 | |
b8695a8f JB |
928 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
929 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
930 | ra_tid->tid = tid; | |
931 | ||
c1475ca9 JB |
932 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
933 | skb_queue_tail(&sdata->skb_queue, skb); | |
934 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
935 | } |
936 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
937 | ||
86ab6c5a | 938 | |
b8695a8f JB |
939 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
940 | struct sta_info *sta, | |
941 | struct ieee80211_mgmt *mgmt, | |
942 | size_t len) | |
943 | { | |
a622ab72 | 944 | struct tid_ampdu_tx *tid_tx; |
6e0456b5 | 945 | struct ieee80211_txq *txq; |
b1720231 | 946 | u16 capab, tid; |
0b01f030 | 947 | u8 buf_size; |
e3abc8ff | 948 | bool amsdu; |
b8695a8f JB |
949 | |
950 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
e3abc8ff | 951 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
b8695a8f | 952 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
0b01f030 | 953 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
ac062197 | 954 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
b8695a8f | 955 | |
6e0456b5 FF |
956 | txq = sta->sta.txq[tid]; |
957 | if (!amsdu && txq) | |
958 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); | |
959 | ||
cfcdbde3 | 960 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 961 | |
40b275b6 | 962 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 963 | if (!tid_tx) |
8ade0082 | 964 | goto out; |
b8695a8f | 965 | |
a622ab72 | 966 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
967 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
968 | sta->sta.addr, tid); | |
8ade0082 | 969 | goto out; |
b8695a8f JB |
970 | } |
971 | ||
d305a655 | 972 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 973 | |
0a214d3f JB |
974 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
975 | sta->sta.addr, tid); | |
d305a655 NM |
976 | |
977 | /* | |
978 | * addba_resp_timer may have fired before we got here, and | |
979 | * caused WANT_STOP to be set. If the stop then was already | |
980 | * processed further, STOPPING might be set. | |
981 | */ | |
982 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
983 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 984 | ht_dbg(sta->sdata, |
0a214d3f JB |
985 | "got addBA resp for %pM tid %d but we already gave up\n", |
986 | sta->sta.addr, tid); | |
d305a655 NM |
987 | goto out; |
988 | } | |
989 | ||
3ca97880 HS |
990 | /* |
991 | * IEEE 802.11-2007 7.3.1.14: | |
992 | * In an ADDBA Response frame, when the Status Code field | |
993 | * is set to 0, the Buffer Size subfield is set to a value | |
994 | * of at least 1. | |
995 | */ | |
b8695a8f | 996 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 997 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
998 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
999 | &tid_tx->state)) { | |
1000 | /* ignore duplicate response */ | |
1001 | goto out; | |
1002 | } | |
b8695a8f | 1003 | |
0b01f030 | 1004 | tid_tx->buf_size = buf_size; |
e3abc8ff | 1005 | tid_tx->amsdu = amsdu; |
0b01f030 | 1006 | |
a622ab72 | 1007 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 1008 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 1009 | |
b1720231 | 1010 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 1011 | |
12d3952f | 1012 | if (tid_tx->timeout) { |
285fa695 NM |
1013 | mod_timer(&tid_tx->session_timer, |
1014 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
1015 | tid_tx->last_tx = jiffies; |
1016 | } | |
285fa695 | 1017 | |
b8695a8f | 1018 | } else { |
c82c4a80 | 1019 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 1020 | } |
2171abc5 | 1021 | |
2171abc5 | 1022 | out: |
cfcdbde3 | 1023 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 1024 | } |