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 |
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; | |
100 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
101 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
102 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
103 | ||
104 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
105 | ||
106 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
107 | mgmt->u.action.u.addba_req.start_seq_num = | |
108 | cpu_to_le16(start_seq_num << 4); | |
109 | ||
62ae67be | 110 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
111 | } |
112 | ||
8c771244 | 113 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 114 | { |
8c771244 | 115 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
116 | struct ieee80211_local *local = sdata->local; |
117 | struct sk_buff *skb; | |
118 | struct ieee80211_bar *bar; | |
119 | u16 bar_control = 0; | |
120 | ||
121 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 122 | if (!skb) |
b8695a8f | 123 | return; |
d15b8459 | 124 | |
b8695a8f JB |
125 | skb_reserve(skb, local->hw.extra_tx_headroom); |
126 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
127 | memset(bar, 0, sizeof(*bar)); | |
128 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
129 | IEEE80211_STYPE_BACK_REQ); | |
130 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 131 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
132 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
133 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 134 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
135 | bar->control = cpu_to_le16(bar_control); |
136 | bar->start_seq_num = cpu_to_le16(ssn); | |
137 | ||
62ae67be JB |
138 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
139 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f | 140 | } |
8c771244 | 141 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 142 | |
ec034b20 JB |
143 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
144 | struct tid_ampdu_tx *tid_tx) | |
145 | { | |
146 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
147 | lockdep_assert_held(&sta->lock); | |
148 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
149 | } | |
150 | ||
67c282c0 | 151 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
152 | enum ieee80211_back_parties initiator, |
153 | bool tx) | |
23e6a7ea | 154 | { |
849b7967 | 155 | struct ieee80211_local *local = sta->local; |
40b275b6 | 156 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 157 | int ret; |
a622ab72 | 158 | |
cfcdbde3 | 159 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 160 | |
cfcdbde3 JB |
161 | spin_lock_bh(&sta->lock); |
162 | ||
40b275b6 JB |
163 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
164 | if (!tid_tx) { | |
165 | spin_unlock_bh(&sta->lock); | |
166 | return -ENOENT; | |
167 | } | |
168 | ||
24f50a9d JB |
169 | /* if we're already stopping ignore any new requests to stop */ |
170 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
171 | spin_unlock_bh(&sta->lock); | |
172 | return -EALREADY; | |
173 | } | |
174 | ||
0ab33703 JB |
175 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
176 | /* not even started yet! */ | |
ec034b20 | 177 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 178 | spin_unlock_bh(&sta->lock); |
0744371a | 179 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
180 | return 0; |
181 | } | |
182 | ||
24f50a9d JB |
183 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
184 | ||
cfcdbde3 JB |
185 | spin_unlock_bh(&sta->lock); |
186 | ||
827d42c9 JB |
187 | #ifdef CONFIG_MAC80211_HT_DEBUG |
188 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
189 | sta->sta.addr, tid); | |
190 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
191 | ||
44271488 | 192 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 193 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 194 | |
a622ab72 JB |
195 | /* |
196 | * After this packets are no longer handed right through | |
197 | * to the driver but are put onto tid_tx->pending instead, | |
198 | * with locking to ensure proper access. | |
199 | */ | |
200 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 201 | |
2a1e0fd1 EG |
202 | /* |
203 | * There might be a few packets being processed right now (on | |
204 | * another CPU) that have already gotten past the aggregation | |
205 | * check when it was still OPERATIONAL and consequently have | |
206 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
207 | * call into the driver at the same time or even before the | |
208 | * TX paths calls into it, which could confuse the driver. | |
209 | * | |
210 | * Wait for all currently running TX paths to finish before | |
211 | * telling the driver. New packets will not go through since | |
212 | * the aggregation session is no longer OPERATIONAL. | |
213 | */ | |
214 | synchronize_net(); | |
215 | ||
a622ab72 | 216 | tid_tx->stop_initiator = initiator; |
53f73c09 | 217 | tid_tx->tx_stop = tx; |
23e6a7ea | 218 | |
12375ef9 | 219 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 220 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 221 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
222 | |
223 | /* HW shall not deny going back to legacy */ | |
224 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
225 | /* |
226 | * We may have pending packets get stuck in this case... | |
227 | * Not bothering with a workaround for now. | |
228 | */ | |
23e6a7ea JB |
229 | } |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
b8695a8f JB |
234 | /* |
235 | * After sending add Block Ack request we activated a timer until | |
236 | * add Block Ack response will arrive from the recipient. | |
237 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
238 | */ | |
239 | static void sta_addba_resp_timer_expired(unsigned long data) | |
240 | { | |
241 | /* not an elegant detour, but there is no choice as the timer passes | |
242 | * only one argument, and both sta_info and TID are needed, so init | |
243 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
244 | * array gives the sta through container_of */ | |
245 | u16 tid = *(u8 *)data; | |
23e6a7ea | 246 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 247 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 248 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 249 | |
b8695a8f | 250 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
251 | rcu_read_lock(); |
252 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
253 | if (!tid_tx || |
254 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 255 | rcu_read_unlock(); |
b8695a8f JB |
256 | #ifdef CONFIG_MAC80211_HT_DEBUG |
257 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 258 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 259 | tid); |
b8695a8f | 260 | #endif |
23e6a7ea | 261 | return; |
b8695a8f JB |
262 | } |
263 | ||
264 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
265 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
266 | #endif | |
267 | ||
83a5cbf7 JB |
268 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
269 | rcu_read_unlock(); | |
b8695a8f JB |
270 | } |
271 | ||
96f5e66e JB |
272 | static inline int ieee80211_ac_from_tid(int tid) |
273 | { | |
274 | return ieee802_1d_to_ac[tid & 7]; | |
275 | } | |
276 | ||
a6a67db2 JB |
277 | /* |
278 | * When multiple aggregation sessions on multiple stations | |
279 | * are being created/destroyed simultaneously, we need to | |
280 | * refcount the global queue stop caused by that in order | |
281 | * to not get into a situation where one of the aggregation | |
282 | * setup or teardown re-enables queues before the other is | |
283 | * ready to handle that. | |
284 | * | |
285 | * These two functions take care of this issue by keeping | |
286 | * a global "agg_queue_stop" refcount. | |
287 | */ | |
288 | static void __acquires(agg_queue) | |
289 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
290 | { | |
291 | int queue = ieee80211_ac_from_tid(tid); | |
292 | ||
293 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
294 | ieee80211_stop_queue_by_reason( | |
295 | &local->hw, queue, | |
296 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
297 | __acquire(agg_queue); | |
298 | } | |
299 | ||
300 | static void __releases(agg_queue) | |
301 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
302 | { | |
303 | int queue = ieee80211_ac_from_tid(tid); | |
304 | ||
305 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
306 | ieee80211_wake_queue_by_reason( | |
307 | &local->hw, queue, | |
308 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
309 | __release(agg_queue); | |
310 | } | |
311 | ||
15062e6a JB |
312 | /* |
313 | * splice packets from the STA's pending to the local pending, | |
314 | * requires a call to ieee80211_agg_splice_finish later | |
315 | */ | |
316 | static void __acquires(agg_queue) | |
317 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
318 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
319 | { | |
320 | int queue = ieee80211_ac_from_tid(tid); | |
321 | unsigned long flags; | |
322 | ||
323 | ieee80211_stop_queue_agg(local, tid); | |
324 | ||
325 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" | |
326 | " from the pending queue\n", tid)) | |
327 | return; | |
328 | ||
329 | if (!skb_queue_empty(&tid_tx->pending)) { | |
330 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
331 | /* copy over remaining packets */ | |
332 | skb_queue_splice_tail_init(&tid_tx->pending, | |
333 | &local->pending[queue]); | |
334 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
335 | } | |
336 | } | |
337 | ||
338 | static void __releases(agg_queue) | |
339 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
340 | { | |
341 | ieee80211_wake_queue_agg(local, tid); | |
342 | } | |
343 | ||
67c282c0 | 344 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 345 | { |
40b275b6 | 346 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
347 | struct ieee80211_local *local = sta->local; |
348 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
349 | u16 start_seq_num; | |
350 | int ret; | |
351 | ||
40b275b6 | 352 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 353 | |
0ab33703 | 354 | /* |
15062e6a JB |
355 | * Start queuing up packets for this aggregation session. |
356 | * We're going to release them once the driver is OK with | |
357 | * that. | |
0ab33703 | 358 | */ |
0ab33703 JB |
359 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
360 | ||
361 | /* | |
15062e6a JB |
362 | * Make sure no packets are being processed. This ensures that |
363 | * we have a valid starting sequence number and that in-flight | |
364 | * packets have been flushed out and no packets for this TID | |
365 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 366 | */ |
cfcdbde3 JB |
367 | synchronize_net(); |
368 | ||
0ab33703 JB |
369 | start_seq_num = sta->tid_seq[tid] >> 4; |
370 | ||
371 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 372 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
373 | if (ret) { |
374 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
375 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
376 | " tid %d\n", tid); | |
377 | #endif | |
cfcdbde3 | 378 | spin_lock_bh(&sta->lock); |
15062e6a | 379 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
ec034b20 | 380 | ieee80211_assign_tid_tx(sta, tid, NULL); |
15062e6a | 381 | ieee80211_agg_splice_finish(local, tid); |
cfcdbde3 JB |
382 | spin_unlock_bh(&sta->lock); |
383 | ||
0744371a | 384 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
385 | return; |
386 | } | |
387 | ||
0ab33703 JB |
388 | /* activate the timer for the recipient's addBA response */ |
389 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
390 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
391 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
392 | #endif | |
393 | ||
cfcdbde3 | 394 | spin_lock_bh(&sta->lock); |
0ab33703 | 395 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 396 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
397 | |
398 | /* send AddBA request */ | |
399 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
400 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
401 | local->hw.max_tx_aggregation_subframes, |
402 | tid_tx->timeout); | |
0ab33703 JB |
403 | } |
404 | ||
285fa695 NM |
405 | /* |
406 | * After accepting the AddBA Response we activated a timer, | |
407 | * resetting it after each frame that we send. | |
408 | */ | |
409 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
410 | { | |
411 | /* not an elegant detour, but there is no choice as the timer passes | |
412 | * only one argument, and various sta_info are needed here, so init | |
413 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
414 | * array gives the sta through container_of */ | |
415 | u8 *ptid = (u8 *)data; | |
416 | u8 *timer_to_id = ptid - *ptid; | |
417 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
418 | timer_to_tid[0]); | |
419 | ||
420 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
421 | printk(KERN_DEBUG "tx session timer expired on tid %d\n", (u16)*ptid); | |
422 | #endif | |
423 | ||
424 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
425 | } | |
426 | ||
bd2ce6e4 SM |
427 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
428 | u16 timeout) | |
b8695a8f | 429 | { |
c951ad35 JB |
430 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
431 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
432 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 433 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 434 | int ret = 0; |
b8695a8f | 435 | |
b5878a2d JB |
436 | trace_api_start_tx_ba_session(pubsta, tid); |
437 | ||
23e6a7ea JB |
438 | if (WARN_ON(!local->ops->ampdu_action)) |
439 | return -EINVAL; | |
440 | ||
c951ad35 | 441 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
442 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
443 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
444 | return -EINVAL; |
445 | ||
446 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
447 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 448 | pubsta->addr, tid); |
b8695a8f JB |
449 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
450 | ||
c951ad35 | 451 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 452 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 453 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
454 | sdata->vif.type != NL80211_IFTYPE_AP && |
455 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 456 | return -EINVAL; |
8abd3f9b | 457 | |
c2c98fde | 458 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 459 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 460 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
461 | "Denying BA session request\n"); |
462 | #endif | |
c951ad35 | 463 | return -EINVAL; |
722f069a S |
464 | } |
465 | ||
ff3cc5f4 SW |
466 | /* |
467 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
468 | * member of an IBSS, and has no other existing Block Ack agreement | |
469 | * with the recipient STA, then the initiating STA shall transmit a | |
470 | * Probe Request frame to the recipient STA and shall not transmit an | |
471 | * ADDBA Request frame unless it receives a Probe Response frame | |
472 | * from the recipient within dot11ADDBAFailureTimeout. | |
473 | * | |
474 | * The probe request mechanism for ADDBA is currently not implemented, | |
475 | * but we only build up Block Ack session with HT STAs. This information | |
476 | * is set when we receive a bss info from a probe response or a beacon. | |
477 | */ | |
478 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
479 | !sta->sta.ht_cap.ht_supported) { | |
480 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
481 | printk(KERN_DEBUG "BA request denied - IBSS STA %pM" | |
482 | "does not advertise HT support\n", pubsta->addr); | |
483 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
b8695a8f JB |
487 | spin_lock_bh(&sta->lock); |
488 | ||
489 | /* we have tried too many times, receiver does not want A-MPDU */ | |
490 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
491 | ret = -EBUSY; | |
492 | goto err_unlock_sta; | |
493 | } | |
494 | ||
40b275b6 | 495 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 496 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 497 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
498 | #ifdef CONFIG_MAC80211_HT_DEBUG |
499 | printk(KERN_DEBUG "BA request denied - session is not " | |
500 | "idle on tid %u\n", tid); | |
501 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
502 | ret = -EAGAIN; | |
503 | goto err_unlock_sta; | |
504 | } | |
505 | ||
506 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
507 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
508 | if (!tid_tx) { | |
b8695a8f | 509 | ret = -ENOMEM; |
0ab33703 | 510 | goto err_unlock_sta; |
b8695a8f | 511 | } |
96f5e66e | 512 | |
a622ab72 | 513 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 514 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 515 | |
bd2ce6e4 SM |
516 | tid_tx->timeout = timeout; |
517 | ||
285fa695 | 518 | /* response timer */ |
a622ab72 JB |
519 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
520 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
521 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 522 | |
285fa695 NM |
523 | /* tx timer */ |
524 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
525 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
526 | init_timer(&tid_tx->session_timer); | |
527 | ||
0ab33703 | 528 | /* assign a dialog token */ |
b8695a8f | 529 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 530 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 531 | |
ec034b20 JB |
532 | /* |
533 | * Finally, assign it to the start array; the work item will | |
534 | * collect it and move it to the normal array. | |
535 | */ | |
536 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 537 | |
0ab33703 | 538 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 539 | |
0ab33703 | 540 | /* this flow continues off the work */ |
96f5e66e | 541 | err_unlock_sta: |
b8695a8f | 542 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
543 | return ret; |
544 | } | |
545 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
546 | ||
b1720231 JB |
547 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
548 | struct sta_info *sta, u16 tid) | |
549 | { | |
40b275b6 JB |
550 | struct tid_ampdu_tx *tid_tx; |
551 | ||
cfcdbde3 | 552 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 553 | |
40b275b6 JB |
554 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
555 | ||
b1720231 | 556 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 557 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
558 | #endif |
559 | ||
cfcdbde3 JB |
560 | drv_ampdu_action(local, sta->sdata, |
561 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 562 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
563 | |
564 | /* | |
565 | * synchronize with TX path, while splicing the TX path | |
566 | * should block so it won't put more packets onto pending. | |
567 | */ | |
568 | spin_lock_bh(&sta->lock); | |
569 | ||
40b275b6 | 570 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 571 | /* |
a622ab72 JB |
572 | * Now mark as operational. This will be visible |
573 | * in the TX path, and lets it go lock-free in | |
574 | * the common case. | |
cd8ffc80 | 575 | */ |
40b275b6 | 576 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 577 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 578 | |
cfcdbde3 | 579 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
580 | } |
581 | ||
c951ad35 | 582 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 583 | { |
c951ad35 JB |
584 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
585 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 586 | struct sta_info *sta; |
a622ab72 | 587 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 588 | |
b5878a2d JB |
589 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
590 | ||
b8695a8f JB |
591 | if (tid >= STA_TID_NUM) { |
592 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
593 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
594 | tid, STA_TID_NUM); | |
595 | #endif | |
596 | return; | |
597 | } | |
598 | ||
cfcdbde3 | 599 | mutex_lock(&local->sta_mtx); |
bc192f89 | 600 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 601 | if (!sta) { |
cfcdbde3 | 602 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
603 | #ifdef CONFIG_MAC80211_HT_DEBUG |
604 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
605 | #endif | |
606 | return; | |
607 | } | |
608 | ||
cfcdbde3 | 609 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 610 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 611 | |
a622ab72 | 612 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 613 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 614 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 615 | #endif |
cfcdbde3 | 616 | goto unlock; |
b8695a8f JB |
617 | } |
618 | ||
a622ab72 | 619 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 620 | goto unlock; |
b8695a8f | 621 | |
a622ab72 | 622 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 623 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 624 | |
cfcdbde3 JB |
625 | unlock: |
626 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
627 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 628 | } |
b8695a8f | 629 | |
c951ad35 | 630 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
631 | const u8 *ra, u16 tid) |
632 | { | |
c951ad35 JB |
633 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
634 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
635 | struct ieee80211_ra_tid *ra_tid; |
636 | struct sk_buff *skb = dev_alloc_skb(0); | |
637 | ||
d15b8459 | 638 | if (unlikely(!skb)) |
86ab6c5a | 639 | return; |
d15b8459 | 640 | |
86ab6c5a JB |
641 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
642 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
643 | ra_tid->tid = tid; | |
644 | ||
c1475ca9 JB |
645 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
646 | skb_queue_tail(&sdata->skb_queue, skb); | |
647 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
648 | } |
649 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
650 | ||
849b7967 | 651 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
652 | enum ieee80211_back_parties initiator, |
653 | bool tx) | |
849b7967 | 654 | { |
849b7967 JB |
655 | int ret; |
656 | ||
cfcdbde3 | 657 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 658 | |
53f73c09 | 659 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 660 | |
cfcdbde3 JB |
661 | mutex_unlock(&sta->ampdu_mlme.mtx); |
662 | ||
849b7967 JB |
663 | return ret; |
664 | } | |
b8695a8f | 665 | |
6a8579d0 | 666 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 667 | { |
c951ad35 JB |
668 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
669 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
670 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
671 | struct tid_ampdu_tx *tid_tx; |
672 | int ret = 0; | |
b8695a8f | 673 | |
6a8579d0 | 674 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 675 | |
4253119a | 676 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
677 | return -EINVAL; |
678 | ||
b8695a8f JB |
679 | if (tid >= STA_TID_NUM) |
680 | return -EINVAL; | |
681 | ||
0ab33703 | 682 | spin_lock_bh(&sta->lock); |
40b275b6 | 683 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
684 | |
685 | if (!tid_tx) { | |
686 | ret = -ENOENT; | |
687 | goto unlock; | |
688 | } | |
689 | ||
690 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
691 | /* already in progress stopping it */ | |
692 | ret = 0; | |
693 | goto unlock; | |
694 | } | |
695 | ||
696 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
697 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
698 | ||
699 | unlock: | |
700 | spin_unlock_bh(&sta->lock); | |
701 | return ret; | |
b8695a8f JB |
702 | } |
703 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
704 | ||
c951ad35 | 705 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 706 | { |
c951ad35 JB |
707 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
708 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 709 | struct sta_info *sta; |
a622ab72 | 710 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 711 | |
b5878a2d JB |
712 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
713 | ||
b8695a8f JB |
714 | if (tid >= STA_TID_NUM) { |
715 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
716 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
717 | tid, STA_TID_NUM); | |
718 | #endif | |
719 | return; | |
720 | } | |
721 | ||
722 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
723 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
724 | ra, tid); | |
725 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
726 | ||
cfcdbde3 JB |
727 | mutex_lock(&local->sta_mtx); |
728 | ||
bc192f89 | 729 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f JB |
730 | if (!sta) { |
731 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
732 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
733 | #endif | |
cfcdbde3 | 734 | goto unlock; |
b8695a8f | 735 | } |
b8695a8f | 736 | |
cfcdbde3 | 737 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 738 | spin_lock_bh(&sta->lock); |
40b275b6 | 739 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
740 | |
741 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
742 | #ifdef CONFIG_MAC80211_HT_DEBUG |
743 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
744 | #endif | |
cfcdbde3 | 745 | goto unlock_sta; |
b8695a8f JB |
746 | } |
747 | ||
53f73c09 | 748 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
749 | ieee80211_send_delba(sta->sdata, ra, tid, |
750 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
751 | ||
a622ab72 JB |
752 | /* |
753 | * When we get here, the TX path will not be lockless any more wrt. | |
754 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
755 | * Thus it will block on getting the lock, if it occurs. So if we | |
756 | * stop the queue now, we will not get any more packets, and any | |
757 | * that might be being processed will wait for us here, thereby | |
758 | * guaranteeing that no packets go to the tid_tx pending queue any | |
759 | * more. | |
760 | */ | |
b8695a8f | 761 | |
a622ab72 | 762 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 763 | |
a622ab72 | 764 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 765 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 766 | |
a622ab72 | 767 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 768 | |
0744371a | 769 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 770 | |
cfcdbde3 | 771 | unlock_sta: |
a622ab72 | 772 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
773 | mutex_unlock(&sta->ampdu_mlme.mtx); |
774 | unlock: | |
775 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 776 | } |
b8695a8f | 777 | |
c951ad35 | 778 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
779 | const u8 *ra, u16 tid) |
780 | { | |
c951ad35 JB |
781 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
782 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
783 | struct ieee80211_ra_tid *ra_tid; |
784 | struct sk_buff *skb = dev_alloc_skb(0); | |
785 | ||
d15b8459 | 786 | if (unlikely(!skb)) |
b8695a8f | 787 | return; |
d15b8459 | 788 | |
b8695a8f JB |
789 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
790 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
791 | ra_tid->tid = tid; | |
792 | ||
c1475ca9 JB |
793 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
794 | skb_queue_tail(&sdata->skb_queue, skb); | |
795 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
796 | } |
797 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
798 | ||
86ab6c5a | 799 | |
b8695a8f JB |
800 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
801 | struct sta_info *sta, | |
802 | struct ieee80211_mgmt *mgmt, | |
803 | size_t len) | |
804 | { | |
a622ab72 | 805 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 806 | u16 capab, tid; |
0b01f030 | 807 | u8 buf_size; |
b8695a8f JB |
808 | |
809 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
810 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 811 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 812 | |
cfcdbde3 | 813 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 814 | |
40b275b6 | 815 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 816 | if (!tid_tx) |
8ade0082 | 817 | goto out; |
b8695a8f | 818 | |
a622ab72 | 819 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
820 | #ifdef CONFIG_MAC80211_HT_DEBUG |
821 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 822 | #endif |
8ade0082 | 823 | goto out; |
b8695a8f JB |
824 | } |
825 | ||
d305a655 | 826 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 827 | |
b8695a8f | 828 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 829 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 830 | #endif |
d305a655 NM |
831 | |
832 | /* | |
833 | * addba_resp_timer may have fired before we got here, and | |
834 | * caused WANT_STOP to be set. If the stop then was already | |
835 | * processed further, STOPPING might be set. | |
836 | */ | |
837 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
838 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
839 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
840 | printk(KERN_DEBUG | |
841 | "got addBA resp for tid %d but we already gave up\n", | |
842 | tid); | |
843 | #endif | |
844 | goto out; | |
845 | } | |
846 | ||
3ca97880 HS |
847 | /* |
848 | * IEEE 802.11-2007 7.3.1.14: | |
849 | * In an ADDBA Response frame, when the Status Code field | |
850 | * is set to 0, the Buffer Size subfield is set to a value | |
851 | * of at least 1. | |
852 | */ | |
b8695a8f | 853 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 854 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
855 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
856 | &tid_tx->state)) { | |
857 | /* ignore duplicate response */ | |
858 | goto out; | |
859 | } | |
b8695a8f | 860 | |
0b01f030 JB |
861 | tid_tx->buf_size = buf_size; |
862 | ||
a622ab72 | 863 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 864 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 865 | |
b1720231 | 866 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 NM |
867 | |
868 | if (tid_tx->timeout) | |
869 | mod_timer(&tid_tx->session_timer, | |
870 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
871 | ||
b8695a8f | 872 | } else { |
53f73c09 JB |
873 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
874 | true); | |
b8695a8f | 875 | } |
2171abc5 | 876 | |
2171abc5 | 877 | out: |
cfcdbde3 | 878 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 879 | } |