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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 |
b8695a8f JB |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
bc3b2d7f | 18 | #include <linux/export.h> |
b8695a8f JB |
19 | #include <net/mac80211.h> |
20 | #include "ieee80211_i.h" | |
24487981 | 21 | #include "driver-ops.h" |
b8695a8f JB |
22 | #include "wme.h" |
23 | ||
86ab6c5a | 24 | /** |
73a72a81 | 25 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
26 | * |
27 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
28 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
29 | * packets with a flag indicating A-MPDU aggregation. The driver | |
30 | * or device is responsible for actually aggregating the frames, | |
31 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 32 | * |
73a72a81 JB |
33 | * When TX aggregation is started by some subsystem (usually the rate |
34 | * control algorithm would be appropriate) by calling the | |
35 | * ieee80211_start_tx_ba_session() function, the driver will be | |
36 | * notified via its @ampdu_action function, with the | |
37 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
38 | * |
39 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
40 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
41 | * start the aggregation session after the peer has also responded. | |
42 | * If the peer responds negatively, the session will be stopped | |
43 | * again right away. Note that it is possible for the aggregation | |
44 | * session to be stopped before the driver has indicated that it | |
45 | * is done setting it up, in which case it must not indicate the | |
46 | * setup completion. | |
86ab6c5a | 47 | * |
73a72a81 JB |
48 | * Also note that, since we also need to wait for a response from |
49 | * the peer, the driver is notified of the completion of the | |
50 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
51 | * @ampdu_action callback. | |
52 | * | |
53 | * Similarly, when the aggregation session is stopped by the peer | |
54 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
55 | * @ampdu_action function will be called with the action | |
56 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
57 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
42624d49 YAP |
58 | * Note that the sta can get destroyed before the BA tear down is |
59 | * complete. | |
86ab6c5a JB |
60 | */ |
61 | ||
b8695a8f JB |
62 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
63 | const u8 *da, u16 tid, | |
64 | u8 dialog_token, u16 start_seq_num, | |
65 | u16 agg_size, u16 timeout) | |
66 | { | |
67 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
68 | struct sk_buff *skb; |
69 | struct ieee80211_mgmt *mgmt; | |
70 | u16 capab; | |
71 | ||
72 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
73 | ||
d15b8459 | 74 | if (!skb) |
b8695a8f | 75 | return; |
d15b8459 | 76 | |
b8695a8f JB |
77 | skb_reserve(skb, local->hw.extra_tx_headroom); |
78 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
79 | memset(mgmt, 0, 24); | |
80 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 81 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 82 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
83 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
84 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 85 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
86 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
87 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
13c40c54 AS |
88 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
89 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); | |
b8695a8f JB |
90 | |
91 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
92 | IEEE80211_STYPE_ACTION); | |
93 | ||
94 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
95 | ||
96 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
97 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
98 | ||
99 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
e3abc8ff EG |
100 | capab = (u16)(1 << 0); /* bit 0 A-MSDU support */ |
101 | capab |= (u16)(1 << 1); /* bit 1 aggregation policy */ | |
b8695a8f JB |
102 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
103 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
104 | ||
105 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
106 | ||
107 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
108 | mgmt->u.action.u.addba_req.start_seq_num = | |
109 | cpu_to_le16(start_seq_num << 4); | |
110 | ||
c6e13327 | 111 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
112 | } |
113 | ||
8c771244 | 114 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 115 | { |
8c771244 | 116 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
117 | struct ieee80211_local *local = sdata->local; |
118 | struct sk_buff *skb; | |
119 | struct ieee80211_bar *bar; | |
120 | u16 bar_control = 0; | |
121 | ||
122 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 123 | if (!skb) |
b8695a8f | 124 | return; |
d15b8459 | 125 | |
b8695a8f JB |
126 | skb_reserve(skb, local->hw.extra_tx_headroom); |
127 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
128 | memset(bar, 0, sizeof(*bar)); | |
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]; | |
196 | struct txq_info *txqi; | |
197 | ||
198 | if (!txq) | |
199 | return; | |
200 | ||
201 | txqi = to_txq_info(txq); | |
202 | ||
203 | /* Lock here to protect against further seqno updates on dequeue */ | |
204 | spin_lock_bh(&txqi->queue.lock); | |
205 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
206 | spin_unlock_bh(&txqi->queue.lock); | |
207 | } | |
208 | ||
209 | static void | |
210 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) | |
211 | { | |
212 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
213 | struct txq_info *txqi; | |
214 | ||
215 | if (!txq) | |
216 | return; | |
217 | ||
218 | txqi = to_txq_info(txq); | |
219 | ||
220 | if (enable) | |
221 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
222 | else | |
223 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
224 | ||
225 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
226 | drv_wake_tx_queue(sta->sdata->local, txqi); | |
227 | } | |
228 | ||
30bf5f1f JB |
229 | /* |
230 | * splice packets from the STA's pending to the local pending, | |
231 | * requires a call to ieee80211_agg_splice_finish later | |
232 | */ | |
233 | static void __acquires(agg_queue) | |
234 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
235 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
236 | { | |
237 | struct ieee80211_local *local = sdata->local; | |
238 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
239 | unsigned long flags; | |
240 | ||
241 | ieee80211_stop_queue_agg(sdata, tid); | |
242 | ||
243 | if (WARN(!tid_tx, | |
244 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
245 | tid)) | |
246 | return; | |
247 | ||
248 | if (!skb_queue_empty(&tid_tx->pending)) { | |
249 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
250 | /* copy over remaining packets */ | |
251 | skb_queue_splice_tail_init(&tid_tx->pending, | |
252 | &local->pending[queue]); | |
253 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
254 | } | |
255 | } | |
256 | ||
257 | static void __releases(agg_queue) | |
258 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
259 | { | |
260 | ieee80211_wake_queue_agg(sdata, tid); | |
261 | } | |
262 | ||
263 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
264 | { | |
265 | struct tid_ampdu_tx *tid_tx; | |
266 | ||
267 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
268 | lockdep_assert_held(&sta->lock); | |
269 | ||
270 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
271 | ||
272 | /* | |
273 | * When we get here, the TX path will not be lockless any more wrt. | |
274 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
275 | * Thus it will block on getting the lock, if it occurs. So if we | |
276 | * stop the queue now, we will not get any more packets, and any | |
277 | * that might be being processed will wait for us here, thereby | |
278 | * guaranteeing that no packets go to the tid_tx pending queue any | |
279 | * more. | |
280 | */ | |
281 | ||
282 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
283 | ||
284 | /* future packets must not find the tid_tx struct any more */ | |
285 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
286 | ||
287 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
ba8c3d6f | 288 | ieee80211_agg_start_txq(sta, tid, false); |
30bf5f1f JB |
289 | |
290 | kfree_rcu(tid_tx, rcu_head); | |
291 | } | |
292 | ||
67c282c0 | 293 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 294 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 295 | { |
849b7967 | 296 | struct ieee80211_local *local = sta->local; |
40b275b6 | 297 | struct tid_ampdu_tx *tid_tx; |
18b559d5 | 298 | enum ieee80211_ampdu_mlme_action action; |
23e6a7ea | 299 | int ret; |
a622ab72 | 300 | |
cfcdbde3 | 301 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 302 | |
18b559d5 JB |
303 | switch (reason) { |
304 | case AGG_STOP_DECLINED: | |
305 | case AGG_STOP_LOCAL_REQUEST: | |
306 | case AGG_STOP_PEER_REQUEST: | |
307 | action = IEEE80211_AMPDU_TX_STOP_CONT; | |
308 | break; | |
309 | case AGG_STOP_DESTROY_STA: | |
310 | action = IEEE80211_AMPDU_TX_STOP_FLUSH; | |
311 | break; | |
312 | default: | |
313 | WARN_ON_ONCE(1); | |
314 | return -EINVAL; | |
315 | } | |
316 | ||
cfcdbde3 JB |
317 | spin_lock_bh(&sta->lock); |
318 | ||
40b275b6 JB |
319 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
320 | if (!tid_tx) { | |
321 | spin_unlock_bh(&sta->lock); | |
322 | return -ENOENT; | |
323 | } | |
324 | ||
18b559d5 JB |
325 | /* |
326 | * if we're already stopping ignore any new requests to stop | |
327 | * unless we're destroying it in which case notify the driver | |
328 | */ | |
24f50a9d JB |
329 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
330 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
331 | if (reason != AGG_STOP_DESTROY_STA) |
332 | return -EALREADY; | |
333 | ret = drv_ampdu_action(local, sta->sdata, | |
334 | IEEE80211_AMPDU_TX_STOP_FLUSH_CONT, | |
e3abc8ff | 335 | &sta->sta, tid, NULL, 0, false); |
18b559d5 | 336 | WARN_ON_ONCE(ret); |
8147dc7f | 337 | return 0; |
24f50a9d JB |
338 | } |
339 | ||
0ab33703 JB |
340 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
341 | /* not even started yet! */ | |
ec034b20 | 342 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 343 | spin_unlock_bh(&sta->lock); |
0744371a | 344 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
345 | return 0; |
346 | } | |
347 | ||
24f50a9d JB |
348 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
349 | ||
cfcdbde3 JB |
350 | spin_unlock_bh(&sta->lock); |
351 | ||
bdcbd8e0 JB |
352 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
353 | sta->sta.addr, tid); | |
827d42c9 | 354 | |
44271488 | 355 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 356 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 357 | |
a622ab72 JB |
358 | /* |
359 | * After this packets are no longer handed right through | |
360 | * to the driver but are put onto tid_tx->pending instead, | |
361 | * with locking to ensure proper access. | |
362 | */ | |
363 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 364 | |
2a1e0fd1 EG |
365 | /* |
366 | * There might be a few packets being processed right now (on | |
367 | * another CPU) that have already gotten past the aggregation | |
368 | * check when it was still OPERATIONAL and consequently have | |
369 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
370 | * call into the driver at the same time or even before the | |
371 | * TX paths calls into it, which could confuse the driver. | |
372 | * | |
373 | * Wait for all currently running TX paths to finish before | |
374 | * telling the driver. New packets will not go through since | |
375 | * the aggregation session is no longer OPERATIONAL. | |
376 | */ | |
377 | synchronize_net(); | |
378 | ||
c82c4a80 JB |
379 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
380 | WLAN_BACK_RECIPIENT : | |
381 | WLAN_BACK_INITIATOR; | |
382 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 383 | |
18b559d5 | 384 | ret = drv_ampdu_action(local, sta->sdata, action, |
e3abc8ff | 385 | &sta->sta, tid, NULL, 0, false); |
23e6a7ea JB |
386 | |
387 | /* HW shall not deny going back to legacy */ | |
388 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
389 | /* |
390 | * We may have pending packets get stuck in this case... | |
391 | * Not bothering with a workaround for now. | |
392 | */ | |
23e6a7ea JB |
393 | } |
394 | ||
8147dc7f JB |
395 | /* |
396 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
397 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
398 | * seem like we can leave the tid_tx data pending forever. | |
399 | * This is true, in a way, but "forever" is only until the | |
400 | * station struct is actually destroyed. In the meantime, | |
401 | * leaving it around ensures that we don't transmit packets | |
402 | * to the driver on this TID which might confuse it. | |
403 | */ | |
18b559d5 JB |
404 | |
405 | return 0; | |
23e6a7ea JB |
406 | } |
407 | ||
b8695a8f JB |
408 | /* |
409 | * After sending add Block Ack request we activated a timer until | |
410 | * add Block Ack response will arrive from the recipient. | |
411 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
412 | */ | |
413 | static void sta_addba_resp_timer_expired(unsigned long data) | |
414 | { | |
415 | /* not an elegant detour, but there is no choice as the timer passes | |
416 | * only one argument, and both sta_info and TID are needed, so init | |
417 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
418 | * array gives the sta through container_of */ | |
419 | u16 tid = *(u8 *)data; | |
23e6a7ea | 420 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 421 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 422 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 423 | |
b8695a8f | 424 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
425 | rcu_read_lock(); |
426 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
427 | if (!tid_tx || |
428 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 429 | rcu_read_unlock(); |
bdcbd8e0 | 430 | ht_dbg(sta->sdata, |
0a214d3f JB |
431 | "timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n", |
432 | sta->sta.addr, tid); | |
23e6a7ea | 433 | return; |
b8695a8f JB |
434 | } |
435 | ||
0a214d3f JB |
436 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
437 | sta->sta.addr, tid); | |
b8695a8f | 438 | |
83a5cbf7 JB |
439 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
440 | rcu_read_unlock(); | |
b8695a8f JB |
441 | } |
442 | ||
67c282c0 | 443 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 444 | { |
40b275b6 | 445 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
446 | struct ieee80211_local *local = sta->local; |
447 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
448 | u16 start_seq_num; | |
449 | int ret; | |
450 | ||
40b275b6 | 451 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 452 | |
0ab33703 | 453 | /* |
15062e6a JB |
454 | * Start queuing up packets for this aggregation session. |
455 | * We're going to release them once the driver is OK with | |
456 | * that. | |
0ab33703 | 457 | */ |
0ab33703 JB |
458 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
459 | ||
ba8c3d6f FF |
460 | ieee80211_agg_stop_txq(sta, tid); |
461 | ||
0ab33703 | 462 | /* |
15062e6a JB |
463 | * Make sure no packets are being processed. This ensures that |
464 | * we have a valid starting sequence number and that in-flight | |
465 | * packets have been flushed out and no packets for this TID | |
466 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 467 | */ |
cfcdbde3 JB |
468 | synchronize_net(); |
469 | ||
0ab33703 JB |
470 | start_seq_num = sta->tid_seq[tid] >> 4; |
471 | ||
472 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
e3abc8ff | 473 | &sta->sta, tid, &start_seq_num, 0, false); |
0ab33703 | 474 | if (ret) { |
bdcbd8e0 | 475 | ht_dbg(sdata, |
0a214d3f JB |
476 | "BA request denied - HW unavailable for %pM tid %d\n", |
477 | sta->sta.addr, tid); | |
cfcdbde3 | 478 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 479 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 480 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 481 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
482 | spin_unlock_bh(&sta->lock); |
483 | ||
ba8c3d6f FF |
484 | ieee80211_agg_start_txq(sta, tid, false); |
485 | ||
0744371a | 486 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
487 | return; |
488 | } | |
489 | ||
0ab33703 JB |
490 | /* activate the timer for the recipient's addBA response */ |
491 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
0a214d3f JB |
492 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
493 | sta->sta.addr, tid); | |
0ab33703 | 494 | |
cfcdbde3 | 495 | spin_lock_bh(&sta->lock); |
84381b4e | 496 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 497 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 498 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
499 | |
500 | /* send AddBA request */ | |
501 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
502 | tid_tx->dialog_token, start_seq_num, | |
ac062197 | 503 | IEEE80211_MAX_AMPDU_BUF, |
5dd36bc9 | 504 | tid_tx->timeout); |
0ab33703 JB |
505 | } |
506 | ||
285fa695 NM |
507 | /* |
508 | * After accepting the AddBA Response we activated a timer, | |
509 | * resetting it after each frame that we send. | |
510 | */ | |
511 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
512 | { | |
513 | /* not an elegant detour, but there is no choice as the timer passes | |
514 | * only one argument, and various sta_info are needed here, so init | |
515 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
516 | * array gives the sta through container_of */ | |
517 | u8 *ptid = (u8 *)data; | |
518 | u8 *timer_to_id = ptid - *ptid; | |
519 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
520 | timer_to_tid[0]); | |
12d3952f FF |
521 | struct tid_ampdu_tx *tid_tx; |
522 | unsigned long timeout; | |
523 | ||
9e73dee7 JB |
524 | rcu_read_lock(); |
525 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
526 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
527 | rcu_read_unlock(); | |
12d3952f | 528 | return; |
9e73dee7 | 529 | } |
12d3952f FF |
530 | |
531 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
532 | if (time_is_after_jiffies(timeout)) { | |
533 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 534 | rcu_read_unlock(); |
12d3952f FF |
535 | return; |
536 | } | |
285fa695 | 537 | |
9e73dee7 JB |
538 | rcu_read_unlock(); |
539 | ||
0a214d3f JB |
540 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
541 | sta->sta.addr, (u16)*ptid); | |
285fa695 NM |
542 | |
543 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
544 | } | |
545 | ||
bd2ce6e4 SM |
546 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
547 | u16 timeout) | |
b8695a8f | 548 | { |
c951ad35 JB |
549 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
550 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
551 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 552 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 553 | int ret = 0; |
b8695a8f | 554 | |
8f9c77fc JB |
555 | trace_api_start_tx_ba_session(pubsta, tid); |
556 | ||
b6da911b LK |
557 | if (WARN(sta->reserved_tid == tid, |
558 | "Requested to start BA session on reserved tid=%d", tid)) | |
559 | return -EINVAL; | |
560 | ||
8f9c77fc JB |
561 | if (!pubsta->ht_cap.ht_supported) |
562 | return -EINVAL; | |
b5878a2d | 563 | |
50c16e22 | 564 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
565 | return -EINVAL; |
566 | ||
5a306f58 | 567 | if ((tid >= IEEE80211_NUM_TIDS) || |
30686bf7 JB |
568 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
569 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
570 | return -EINVAL; |
571 | ||
bdcbd8e0 JB |
572 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
573 | pubsta->addr, tid); | |
b8695a8f | 574 | |
c951ad35 | 575 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 576 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 577 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
578 | sdata->vif.type != NL80211_IFTYPE_AP && |
579 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 580 | return -EINVAL; |
8abd3f9b | 581 | |
c2c98fde | 582 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 583 | ht_dbg(sdata, |
0a214d3f JB |
584 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
585 | sta->sta.addr, tid); | |
c951ad35 | 586 | return -EINVAL; |
722f069a S |
587 | } |
588 | ||
ff3cc5f4 SW |
589 | /* |
590 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
591 | * member of an IBSS, and has no other existing Block Ack agreement | |
592 | * with the recipient STA, then the initiating STA shall transmit a | |
593 | * Probe Request frame to the recipient STA and shall not transmit an | |
594 | * ADDBA Request frame unless it receives a Probe Response frame | |
595 | * from the recipient within dot11ADDBAFailureTimeout. | |
596 | * | |
597 | * The probe request mechanism for ADDBA is currently not implemented, | |
598 | * but we only build up Block Ack session with HT STAs. This information | |
599 | * is set when we receive a bss info from a probe response or a beacon. | |
600 | */ | |
601 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
602 | !sta->sta.ht_cap.ht_supported) { | |
bdcbd8e0 JB |
603 | ht_dbg(sdata, |
604 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
605 | pubsta->addr); | |
ff3cc5f4 SW |
606 | return -EINVAL; |
607 | } | |
608 | ||
b8695a8f JB |
609 | spin_lock_bh(&sta->lock); |
610 | ||
611 | /* we have tried too many times, receiver does not want A-MPDU */ | |
612 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
613 | ret = -EBUSY; | |
84381b4e NM |
614 | goto err_unlock_sta; |
615 | } | |
616 | ||
617 | /* | |
618 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
619 | * will spread our requests in time to avoid stalling connection | |
620 | * for too long | |
621 | */ | |
622 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
623 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
624 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 625 | ht_dbg(sdata, |
0a214d3f JB |
626 | "BA request denied - waiting a grace period after %d failed requests on %pM tid %u\n", |
627 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); | |
84381b4e | 628 | ret = -EBUSY; |
b8695a8f JB |
629 | goto err_unlock_sta; |
630 | } | |
631 | ||
40b275b6 | 632 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 633 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 634 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 635 | ht_dbg(sdata, |
0a214d3f JB |
636 | "BA request denied - session is not idle on %pM tid %u\n", |
637 | sta->sta.addr, tid); | |
b8695a8f JB |
638 | ret = -EAGAIN; |
639 | goto err_unlock_sta; | |
640 | } | |
641 | ||
642 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
643 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
644 | if (!tid_tx) { | |
b8695a8f | 645 | ret = -ENOMEM; |
0ab33703 | 646 | goto err_unlock_sta; |
b8695a8f | 647 | } |
96f5e66e | 648 | |
a622ab72 | 649 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 650 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 651 | |
bd2ce6e4 SM |
652 | tid_tx->timeout = timeout; |
653 | ||
285fa695 | 654 | /* response timer */ |
a622ab72 JB |
655 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
656 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
657 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 658 | |
285fa695 NM |
659 | /* tx timer */ |
660 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
661 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 662 | init_timer_deferrable(&tid_tx->session_timer); |
285fa695 | 663 | |
0ab33703 | 664 | /* assign a dialog token */ |
b8695a8f | 665 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 666 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 667 | |
ec034b20 JB |
668 | /* |
669 | * Finally, assign it to the start array; the work item will | |
670 | * collect it and move it to the normal array. | |
671 | */ | |
672 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 673 | |
0ab33703 | 674 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 675 | |
0ab33703 | 676 | /* this flow continues off the work */ |
96f5e66e | 677 | err_unlock_sta: |
b8695a8f | 678 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
679 | return ret; |
680 | } | |
681 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
682 | ||
b1720231 JB |
683 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
684 | struct sta_info *sta, u16 tid) | |
685 | { | |
40b275b6 JB |
686 | struct tid_ampdu_tx *tid_tx; |
687 | ||
cfcdbde3 | 688 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 689 | |
40b275b6 JB |
690 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
691 | ||
0a214d3f JB |
692 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
693 | sta->sta.addr, tid); | |
b1720231 | 694 | |
cfcdbde3 JB |
695 | drv_ampdu_action(local, sta->sdata, |
696 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
e3abc8ff EG |
697 | &sta->sta, tid, NULL, tid_tx->buf_size, |
698 | tid_tx->amsdu); | |
cfcdbde3 JB |
699 | |
700 | /* | |
701 | * synchronize with TX path, while splicing the TX path | |
702 | * should block so it won't put more packets onto pending. | |
703 | */ | |
704 | spin_lock_bh(&sta->lock); | |
705 | ||
3a25a8c8 | 706 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 707 | /* |
a622ab72 JB |
708 | * Now mark as operational. This will be visible |
709 | * in the TX path, and lets it go lock-free in | |
710 | * the common case. | |
cd8ffc80 | 711 | */ |
40b275b6 | 712 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 713 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 714 | |
cfcdbde3 | 715 | spin_unlock_bh(&sta->lock); |
ba8c3d6f FF |
716 | |
717 | ieee80211_agg_start_txq(sta, tid, true); | |
b1720231 JB |
718 | } |
719 | ||
c951ad35 | 720 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 721 | { |
c951ad35 JB |
722 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
723 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 724 | struct sta_info *sta; |
a622ab72 | 725 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 726 | |
b5878a2d JB |
727 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
728 | ||
5a306f58 | 729 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 730 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 731 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
732 | return; |
733 | } | |
734 | ||
cfcdbde3 | 735 | mutex_lock(&local->sta_mtx); |
bc192f89 | 736 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 737 | if (!sta) { |
cfcdbde3 | 738 | mutex_unlock(&local->sta_mtx); |
bdcbd8e0 | 739 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
b8695a8f JB |
740 | return; |
741 | } | |
742 | ||
cfcdbde3 | 743 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 744 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 745 | |
a622ab72 | 746 | if (WARN_ON(!tid_tx)) { |
bdcbd8e0 | 747 | ht_dbg(sdata, "addBA was not requested!\n"); |
cfcdbde3 | 748 | goto unlock; |
b8695a8f JB |
749 | } |
750 | ||
a622ab72 | 751 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 752 | goto unlock; |
b8695a8f | 753 | |
a622ab72 | 754 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 755 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 756 | |
cfcdbde3 JB |
757 | unlock: |
758 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
759 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 760 | } |
b8695a8f | 761 | |
c951ad35 | 762 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
763 | const u8 *ra, u16 tid) |
764 | { | |
c951ad35 JB |
765 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
766 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
767 | struct ieee80211_ra_tid *ra_tid; |
768 | struct sk_buff *skb = dev_alloc_skb(0); | |
769 | ||
d15b8459 | 770 | if (unlikely(!skb)) |
86ab6c5a | 771 | return; |
d15b8459 | 772 | |
86ab6c5a JB |
773 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
774 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
775 | ra_tid->tid = tid; | |
776 | ||
c1475ca9 JB |
777 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
778 | skb_queue_tail(&sdata->skb_queue, skb); | |
779 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
780 | } |
781 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
782 | ||
849b7967 | 783 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 784 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 785 | { |
849b7967 JB |
786 | int ret; |
787 | ||
cfcdbde3 | 788 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 789 | |
c82c4a80 | 790 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 791 | |
cfcdbde3 JB |
792 | mutex_unlock(&sta->ampdu_mlme.mtx); |
793 | ||
849b7967 JB |
794 | return ret; |
795 | } | |
b8695a8f | 796 | |
6a8579d0 | 797 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 798 | { |
c951ad35 JB |
799 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
800 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
801 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
802 | struct tid_ampdu_tx *tid_tx; |
803 | int ret = 0; | |
b8695a8f | 804 | |
6a8579d0 | 805 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 806 | |
4253119a | 807 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
808 | return -EINVAL; |
809 | ||
5a306f58 | 810 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
811 | return -EINVAL; |
812 | ||
0ab33703 | 813 | spin_lock_bh(&sta->lock); |
40b275b6 | 814 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
815 | |
816 | if (!tid_tx) { | |
817 | ret = -ENOENT; | |
818 | goto unlock; | |
819 | } | |
820 | ||
b6da911b LK |
821 | WARN(sta->reserved_tid == tid, |
822 | "Requested to stop BA session on reserved tid=%d", tid); | |
823 | ||
0ab33703 JB |
824 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
825 | /* already in progress stopping it */ | |
826 | ret = 0; | |
827 | goto unlock; | |
828 | } | |
829 | ||
830 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
831 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
832 | ||
833 | unlock: | |
834 | spin_unlock_bh(&sta->lock); | |
835 | return ret; | |
b8695a8f JB |
836 | } |
837 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
838 | ||
c951ad35 | 839 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 840 | { |
c951ad35 JB |
841 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
842 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 843 | struct sta_info *sta; |
a622ab72 | 844 | struct tid_ampdu_tx *tid_tx; |
2c158887 | 845 | bool send_delba = false; |
b8695a8f | 846 | |
b5878a2d JB |
847 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
848 | ||
5a306f58 | 849 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 850 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 851 | tid, IEEE80211_NUM_TIDS); |
b8695a8f JB |
852 | return; |
853 | } | |
854 | ||
bdcbd8e0 | 855 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 856 | |
cfcdbde3 JB |
857 | mutex_lock(&local->sta_mtx); |
858 | ||
bc192f89 | 859 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 860 | if (!sta) { |
bdcbd8e0 | 861 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
cfcdbde3 | 862 | goto unlock; |
b8695a8f | 863 | } |
b8695a8f | 864 | |
cfcdbde3 | 865 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 866 | spin_lock_bh(&sta->lock); |
40b275b6 | 867 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
868 | |
869 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
0a214d3f JB |
870 | ht_dbg(sdata, |
871 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
872 | sta->sta.addr, tid); | |
cfcdbde3 | 873 | goto unlock_sta; |
b8695a8f JB |
874 | } |
875 | ||
53f73c09 | 876 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 877 | send_delba = true; |
b8695a8f | 878 | |
faec12ee | 879 | ieee80211_remove_tid_tx(sta, tid); |
b8695a8f | 880 | |
cfcdbde3 | 881 | unlock_sta: |
a622ab72 | 882 | spin_unlock_bh(&sta->lock); |
2c158887 JB |
883 | |
884 | if (send_delba) | |
885 | ieee80211_send_delba(sdata, ra, tid, | |
886 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
887 | ||
cfcdbde3 JB |
888 | mutex_unlock(&sta->ampdu_mlme.mtx); |
889 | unlock: | |
890 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 891 | } |
b8695a8f | 892 | |
c951ad35 | 893 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
894 | const u8 *ra, u16 tid) |
895 | { | |
c951ad35 JB |
896 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
897 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
898 | struct ieee80211_ra_tid *ra_tid; |
899 | struct sk_buff *skb = dev_alloc_skb(0); | |
900 | ||
d15b8459 | 901 | if (unlikely(!skb)) |
b8695a8f | 902 | return; |
d15b8459 | 903 | |
b8695a8f JB |
904 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
905 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
906 | ra_tid->tid = tid; | |
907 | ||
c1475ca9 JB |
908 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
909 | skb_queue_tail(&sdata->skb_queue, skb); | |
910 | ieee80211_queue_work(&local->hw, &sdata->work); | |
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; |
b1720231 | 921 | u16 capab, tid; |
0b01f030 | 922 | u8 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 | |
cfcdbde3 | 931 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 932 | |
40b275b6 | 933 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 934 | if (!tid_tx) |
8ade0082 | 935 | goto out; |
b8695a8f | 936 | |
a622ab72 | 937 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
938 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
939 | sta->sta.addr, tid); | |
8ade0082 | 940 | goto out; |
b8695a8f JB |
941 | } |
942 | ||
d305a655 | 943 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 944 | |
0a214d3f JB |
945 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
946 | sta->sta.addr, tid); | |
d305a655 NM |
947 | |
948 | /* | |
949 | * addba_resp_timer may have fired before we got here, and | |
950 | * caused WANT_STOP to be set. If the stop then was already | |
951 | * processed further, STOPPING might be set. | |
952 | */ | |
953 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
954 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 955 | ht_dbg(sta->sdata, |
0a214d3f JB |
956 | "got addBA resp for %pM tid %d but we already gave up\n", |
957 | sta->sta.addr, tid); | |
d305a655 NM |
958 | goto out; |
959 | } | |
960 | ||
3ca97880 HS |
961 | /* |
962 | * IEEE 802.11-2007 7.3.1.14: | |
963 | * In an ADDBA Response frame, when the Status Code field | |
964 | * is set to 0, the Buffer Size subfield is set to a value | |
965 | * of at least 1. | |
966 | */ | |
b8695a8f | 967 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 968 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
969 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
970 | &tid_tx->state)) { | |
971 | /* ignore duplicate response */ | |
972 | goto out; | |
973 | } | |
b8695a8f | 974 | |
0b01f030 | 975 | tid_tx->buf_size = buf_size; |
e3abc8ff | 976 | tid_tx->amsdu = amsdu; |
0b01f030 | 977 | |
a622ab72 | 978 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 979 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 980 | |
b1720231 | 981 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 982 | |
12d3952f | 983 | if (tid_tx->timeout) { |
285fa695 NM |
984 | mod_timer(&tid_tx->session_timer, |
985 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
986 | tid_tx->last_tx = jiffies; |
987 | } | |
285fa695 | 988 | |
b8695a8f | 989 | } else { |
c82c4a80 | 990 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 991 | } |
2171abc5 | 992 | |
2171abc5 | 993 | out: |
cfcdbde3 | 994 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 995 | } |