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(). | |
86ab6c5a JB |
58 | */ |
59 | ||
b8695a8f JB |
60 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
61 | const u8 *da, u16 tid, | |
62 | u8 dialog_token, u16 start_seq_num, | |
63 | u16 agg_size, u16 timeout) | |
64 | { | |
65 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
66 | struct sk_buff *skb; |
67 | struct ieee80211_mgmt *mgmt; | |
68 | u16 capab; | |
69 | ||
70 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
71 | ||
d15b8459 | 72 | if (!skb) |
b8695a8f | 73 | return; |
d15b8459 | 74 | |
b8695a8f JB |
75 | skb_reserve(skb, local->hw.extra_tx_headroom); |
76 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
77 | memset(mgmt, 0, 24); | |
78 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 80 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
81 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
82 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 83 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
84 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
85 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
86 | |
87 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
88 | IEEE80211_STYPE_ACTION); | |
89 | ||
90 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
91 | ||
92 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
93 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
94 | ||
95 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
96 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
97 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
98 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
99 | ||
100 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
101 | ||
102 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
103 | mgmt->u.action.u.addba_req.start_seq_num = | |
104 | cpu_to_le16(start_seq_num << 4); | |
105 | ||
62ae67be | 106 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
107 | } |
108 | ||
8c771244 | 109 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 110 | { |
8c771244 | 111 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
112 | struct ieee80211_local *local = sdata->local; |
113 | struct sk_buff *skb; | |
114 | struct ieee80211_bar *bar; | |
115 | u16 bar_control = 0; | |
116 | ||
117 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 118 | if (!skb) |
b8695a8f | 119 | return; |
d15b8459 | 120 | |
b8695a8f JB |
121 | skb_reserve(skb, local->hw.extra_tx_headroom); |
122 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
123 | memset(bar, 0, sizeof(*bar)); | |
124 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
125 | IEEE80211_STYPE_BACK_REQ); | |
126 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 127 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
128 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
129 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 130 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
131 | bar->control = cpu_to_le16(bar_control); |
132 | bar->start_seq_num = cpu_to_le16(ssn); | |
133 | ||
62ae67be JB |
134 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
135 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f | 136 | } |
8c771244 | 137 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 138 | |
ec034b20 JB |
139 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
140 | struct tid_ampdu_tx *tid_tx) | |
141 | { | |
142 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
143 | lockdep_assert_held(&sta->lock); | |
144 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
145 | } | |
146 | ||
67c282c0 | 147 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
148 | enum ieee80211_back_parties initiator, |
149 | bool tx) | |
23e6a7ea | 150 | { |
849b7967 | 151 | struct ieee80211_local *local = sta->local; |
40b275b6 | 152 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 153 | int ret; |
a622ab72 | 154 | |
cfcdbde3 | 155 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 156 | |
cfcdbde3 JB |
157 | spin_lock_bh(&sta->lock); |
158 | ||
40b275b6 JB |
159 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
160 | if (!tid_tx) { | |
161 | spin_unlock_bh(&sta->lock); | |
162 | return -ENOENT; | |
163 | } | |
164 | ||
24f50a9d JB |
165 | /* if we're already stopping ignore any new requests to stop */ |
166 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
167 | spin_unlock_bh(&sta->lock); | |
168 | return -EALREADY; | |
169 | } | |
170 | ||
0ab33703 JB |
171 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
172 | /* not even started yet! */ | |
ec034b20 | 173 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 174 | spin_unlock_bh(&sta->lock); |
0744371a | 175 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
176 | return 0; |
177 | } | |
178 | ||
24f50a9d JB |
179 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
180 | ||
cfcdbde3 JB |
181 | spin_unlock_bh(&sta->lock); |
182 | ||
827d42c9 JB |
183 | #ifdef CONFIG_MAC80211_HT_DEBUG |
184 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
185 | sta->sta.addr, tid); | |
186 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
187 | ||
44271488 | 188 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 189 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 190 | |
a622ab72 JB |
191 | /* |
192 | * After this packets are no longer handed right through | |
193 | * to the driver but are put onto tid_tx->pending instead, | |
194 | * with locking to ensure proper access. | |
195 | */ | |
196 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 197 | |
2a1e0fd1 EG |
198 | /* |
199 | * There might be a few packets being processed right now (on | |
200 | * another CPU) that have already gotten past the aggregation | |
201 | * check when it was still OPERATIONAL and consequently have | |
202 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
203 | * call into the driver at the same time or even before the | |
204 | * TX paths calls into it, which could confuse the driver. | |
205 | * | |
206 | * Wait for all currently running TX paths to finish before | |
207 | * telling the driver. New packets will not go through since | |
208 | * the aggregation session is no longer OPERATIONAL. | |
209 | */ | |
210 | synchronize_net(); | |
211 | ||
a622ab72 | 212 | tid_tx->stop_initiator = initiator; |
53f73c09 | 213 | tid_tx->tx_stop = tx; |
23e6a7ea | 214 | |
12375ef9 | 215 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 216 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 217 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
218 | |
219 | /* HW shall not deny going back to legacy */ | |
220 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
221 | /* |
222 | * We may have pending packets get stuck in this case... | |
223 | * Not bothering with a workaround for now. | |
224 | */ | |
23e6a7ea JB |
225 | } |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
b8695a8f JB |
230 | /* |
231 | * After sending add Block Ack request we activated a timer until | |
232 | * add Block Ack response will arrive from the recipient. | |
233 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
234 | */ | |
235 | static void sta_addba_resp_timer_expired(unsigned long data) | |
236 | { | |
237 | /* not an elegant detour, but there is no choice as the timer passes | |
238 | * only one argument, and both sta_info and TID are needed, so init | |
239 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
240 | * array gives the sta through container_of */ | |
241 | u16 tid = *(u8 *)data; | |
23e6a7ea | 242 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 243 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 244 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 245 | |
b8695a8f | 246 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
247 | rcu_read_lock(); |
248 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
249 | if (!tid_tx || |
250 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 251 | rcu_read_unlock(); |
b8695a8f JB |
252 | #ifdef CONFIG_MAC80211_HT_DEBUG |
253 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 254 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 255 | tid); |
b8695a8f | 256 | #endif |
23e6a7ea | 257 | return; |
b8695a8f JB |
258 | } |
259 | ||
260 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
261 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
262 | #endif | |
263 | ||
83a5cbf7 JB |
264 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
265 | rcu_read_unlock(); | |
b8695a8f JB |
266 | } |
267 | ||
96f5e66e JB |
268 | static inline int ieee80211_ac_from_tid(int tid) |
269 | { | |
270 | return ieee802_1d_to_ac[tid & 7]; | |
271 | } | |
272 | ||
a6a67db2 JB |
273 | /* |
274 | * When multiple aggregation sessions on multiple stations | |
275 | * are being created/destroyed simultaneously, we need to | |
276 | * refcount the global queue stop caused by that in order | |
277 | * to not get into a situation where one of the aggregation | |
278 | * setup or teardown re-enables queues before the other is | |
279 | * ready to handle that. | |
280 | * | |
281 | * These two functions take care of this issue by keeping | |
282 | * a global "agg_queue_stop" refcount. | |
283 | */ | |
284 | static void __acquires(agg_queue) | |
285 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
286 | { | |
287 | int queue = ieee80211_ac_from_tid(tid); | |
288 | ||
289 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
290 | ieee80211_stop_queue_by_reason( | |
291 | &local->hw, queue, | |
292 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
293 | __acquire(agg_queue); | |
294 | } | |
295 | ||
296 | static void __releases(agg_queue) | |
297 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
298 | { | |
299 | int queue = ieee80211_ac_from_tid(tid); | |
300 | ||
301 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
302 | ieee80211_wake_queue_by_reason( | |
303 | &local->hw, queue, | |
304 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
305 | __release(agg_queue); | |
306 | } | |
307 | ||
67c282c0 | 308 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 309 | { |
40b275b6 | 310 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
311 | struct ieee80211_local *local = sta->local; |
312 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
313 | u16 start_seq_num; | |
314 | int ret; | |
315 | ||
40b275b6 | 316 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 317 | |
0ab33703 JB |
318 | /* |
319 | * While we're asking the driver about the aggregation, | |
320 | * stop the AC queue so that we don't have to worry | |
321 | * about frames that came in while we were doing that, | |
322 | * which would require us to put them to the AC pending | |
323 | * afterwards which just makes the code more complex. | |
324 | */ | |
325 | ieee80211_stop_queue_agg(local, tid); | |
326 | ||
327 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
328 | ||
329 | /* | |
cfcdbde3 JB |
330 | * make sure no packets are being processed to get |
331 | * valid starting sequence number | |
0ab33703 | 332 | */ |
cfcdbde3 JB |
333 | synchronize_net(); |
334 | ||
0ab33703 JB |
335 | start_seq_num = sta->tid_seq[tid] >> 4; |
336 | ||
337 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 338 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
339 | if (ret) { |
340 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
341 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
342 | " tid %d\n", tid); | |
343 | #endif | |
cfcdbde3 | 344 | spin_lock_bh(&sta->lock); |
ec034b20 | 345 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 JB |
346 | spin_unlock_bh(&sta->lock); |
347 | ||
0ab33703 | 348 | ieee80211_wake_queue_agg(local, tid); |
0744371a | 349 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
350 | return; |
351 | } | |
352 | ||
353 | /* we can take packets again now */ | |
354 | ieee80211_wake_queue_agg(local, tid); | |
355 | ||
356 | /* activate the timer for the recipient's addBA response */ | |
357 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
358 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
359 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
360 | #endif | |
361 | ||
cfcdbde3 | 362 | spin_lock_bh(&sta->lock); |
0ab33703 | 363 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 364 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
365 | |
366 | /* send AddBA request */ | |
367 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
368 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
369 | local->hw.max_tx_aggregation_subframes, |
370 | tid_tx->timeout); | |
0ab33703 JB |
371 | } |
372 | ||
285fa695 NM |
373 | /* |
374 | * After accepting the AddBA Response we activated a timer, | |
375 | * resetting it after each frame that we send. | |
376 | */ | |
377 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
378 | { | |
379 | /* not an elegant detour, but there is no choice as the timer passes | |
380 | * only one argument, and various sta_info are needed here, so init | |
381 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
382 | * array gives the sta through container_of */ | |
383 | u8 *ptid = (u8 *)data; | |
384 | u8 *timer_to_id = ptid - *ptid; | |
385 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
386 | timer_to_tid[0]); | |
387 | ||
388 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
389 | printk(KERN_DEBUG "tx session timer expired on tid %d\n", (u16)*ptid); | |
390 | #endif | |
391 | ||
392 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
393 | } | |
394 | ||
bd2ce6e4 SM |
395 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
396 | u16 timeout) | |
b8695a8f | 397 | { |
c951ad35 JB |
398 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
399 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
400 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 401 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 402 | int ret = 0; |
b8695a8f | 403 | |
b5878a2d JB |
404 | trace_api_start_tx_ba_session(pubsta, tid); |
405 | ||
23e6a7ea JB |
406 | if (WARN_ON(!local->ops->ampdu_action)) |
407 | return -EINVAL; | |
408 | ||
c951ad35 | 409 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
410 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
411 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
412 | return -EINVAL; |
413 | ||
414 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
415 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 416 | pubsta->addr, tid); |
b8695a8f JB |
417 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
418 | ||
c951ad35 | 419 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 420 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 JB |
421 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
422 | sdata->vif.type != NL80211_IFTYPE_AP) | |
423 | return -EINVAL; | |
8abd3f9b | 424 | |
c2c98fde | 425 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 426 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 427 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
428 | "Denying BA session request\n"); |
429 | #endif | |
c951ad35 | 430 | return -EINVAL; |
722f069a S |
431 | } |
432 | ||
ff3cc5f4 SW |
433 | /* |
434 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
435 | * member of an IBSS, and has no other existing Block Ack agreement | |
436 | * with the recipient STA, then the initiating STA shall transmit a | |
437 | * Probe Request frame to the recipient STA and shall not transmit an | |
438 | * ADDBA Request frame unless it receives a Probe Response frame | |
439 | * from the recipient within dot11ADDBAFailureTimeout. | |
440 | * | |
441 | * The probe request mechanism for ADDBA is currently not implemented, | |
442 | * but we only build up Block Ack session with HT STAs. This information | |
443 | * is set when we receive a bss info from a probe response or a beacon. | |
444 | */ | |
445 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
446 | !sta->sta.ht_cap.ht_supported) { | |
447 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
448 | printk(KERN_DEBUG "BA request denied - IBSS STA %pM" | |
449 | "does not advertise HT support\n", pubsta->addr); | |
450 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
b8695a8f JB |
454 | spin_lock_bh(&sta->lock); |
455 | ||
456 | /* we have tried too many times, receiver does not want A-MPDU */ | |
457 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
458 | ret = -EBUSY; | |
459 | goto err_unlock_sta; | |
460 | } | |
461 | ||
40b275b6 | 462 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 463 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 464 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
465 | #ifdef CONFIG_MAC80211_HT_DEBUG |
466 | printk(KERN_DEBUG "BA request denied - session is not " | |
467 | "idle on tid %u\n", tid); | |
468 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
469 | ret = -EAGAIN; | |
470 | goto err_unlock_sta; | |
471 | } | |
472 | ||
473 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
474 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
475 | if (!tid_tx) { | |
b8695a8f | 476 | ret = -ENOMEM; |
0ab33703 | 477 | goto err_unlock_sta; |
b8695a8f | 478 | } |
96f5e66e | 479 | |
a622ab72 | 480 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 481 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 482 | |
bd2ce6e4 SM |
483 | tid_tx->timeout = timeout; |
484 | ||
285fa695 | 485 | /* response timer */ |
a622ab72 JB |
486 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
487 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
488 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 489 | |
285fa695 NM |
490 | /* tx timer */ |
491 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
492 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
493 | init_timer(&tid_tx->session_timer); | |
494 | ||
0ab33703 | 495 | /* assign a dialog token */ |
b8695a8f | 496 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 497 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 498 | |
ec034b20 JB |
499 | /* |
500 | * Finally, assign it to the start array; the work item will | |
501 | * collect it and move it to the normal array. | |
502 | */ | |
503 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 504 | |
0ab33703 | 505 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 506 | |
0ab33703 | 507 | /* this flow continues off the work */ |
96f5e66e | 508 | err_unlock_sta: |
b8695a8f | 509 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
510 | return ret; |
511 | } | |
512 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
513 | ||
cd8ffc80 JB |
514 | /* |
515 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 516 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 517 | */ |
a6a67db2 JB |
518 | static void __acquires(agg_queue) |
519 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
520 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 521 | { |
a6a67db2 | 522 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 523 | unsigned long flags; |
cd8ffc80 | 524 | |
a6a67db2 | 525 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 526 | |
a622ab72 JB |
527 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
528 | " from the pending queue\n", tid)) | |
416fbdff LR |
529 | return; |
530 | ||
a622ab72 | 531 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 532 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 533 | /* copy over remaining packets */ |
a622ab72 JB |
534 | skb_queue_splice_tail_init(&tid_tx->pending, |
535 | &local->pending[queue]); | |
cd8ffc80 JB |
536 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
537 | } | |
538 | } | |
539 | ||
a6a67db2 JB |
540 | static void __releases(agg_queue) |
541 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 542 | { |
a6a67db2 | 543 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
544 | } |
545 | ||
b1720231 JB |
546 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
547 | struct sta_info *sta, u16 tid) | |
548 | { | |
40b275b6 JB |
549 | struct tid_ampdu_tx *tid_tx; |
550 | ||
cfcdbde3 | 551 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 552 | |
40b275b6 JB |
553 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
554 | ||
b1720231 | 555 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 556 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
557 | #endif |
558 | ||
cfcdbde3 JB |
559 | drv_ampdu_action(local, sta->sdata, |
560 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 561 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
562 | |
563 | /* | |
564 | * synchronize with TX path, while splicing the TX path | |
565 | * should block so it won't put more packets onto pending. | |
566 | */ | |
567 | spin_lock_bh(&sta->lock); | |
568 | ||
40b275b6 | 569 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 570 | /* |
a622ab72 JB |
571 | * Now mark as operational. This will be visible |
572 | * in the TX path, and lets it go lock-free in | |
573 | * the common case. | |
cd8ffc80 | 574 | */ |
40b275b6 | 575 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 576 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 577 | |
cfcdbde3 | 578 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
579 | } |
580 | ||
c951ad35 | 581 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 582 | { |
c951ad35 JB |
583 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
584 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 585 | struct sta_info *sta; |
a622ab72 | 586 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 587 | |
b5878a2d JB |
588 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
589 | ||
b8695a8f JB |
590 | if (tid >= STA_TID_NUM) { |
591 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
592 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
593 | tid, STA_TID_NUM); | |
594 | #endif | |
595 | return; | |
596 | } | |
597 | ||
cfcdbde3 | 598 | mutex_lock(&local->sta_mtx); |
bc192f89 | 599 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 600 | if (!sta) { |
cfcdbde3 | 601 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
602 | #ifdef CONFIG_MAC80211_HT_DEBUG |
603 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
604 | #endif | |
605 | return; | |
606 | } | |
607 | ||
cfcdbde3 | 608 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 609 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 610 | |
a622ab72 | 611 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 612 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 613 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 614 | #endif |
cfcdbde3 | 615 | goto unlock; |
b8695a8f JB |
616 | } |
617 | ||
a622ab72 | 618 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 619 | goto unlock; |
b8695a8f | 620 | |
a622ab72 | 621 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 622 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 623 | |
cfcdbde3 JB |
624 | unlock: |
625 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
626 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 627 | } |
b8695a8f | 628 | |
c951ad35 | 629 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
630 | const u8 *ra, u16 tid) |
631 | { | |
c951ad35 JB |
632 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
633 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
634 | struct ieee80211_ra_tid *ra_tid; |
635 | struct sk_buff *skb = dev_alloc_skb(0); | |
636 | ||
d15b8459 | 637 | if (unlikely(!skb)) |
86ab6c5a | 638 | return; |
d15b8459 | 639 | |
86ab6c5a JB |
640 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
641 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
642 | ra_tid->tid = tid; | |
643 | ||
c1475ca9 JB |
644 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
645 | skb_queue_tail(&sdata->skb_queue, skb); | |
646 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
647 | } |
648 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
649 | ||
849b7967 | 650 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
651 | enum ieee80211_back_parties initiator, |
652 | bool tx) | |
849b7967 | 653 | { |
849b7967 JB |
654 | int ret; |
655 | ||
cfcdbde3 | 656 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 657 | |
53f73c09 | 658 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 659 | |
cfcdbde3 JB |
660 | mutex_unlock(&sta->ampdu_mlme.mtx); |
661 | ||
849b7967 JB |
662 | return ret; |
663 | } | |
b8695a8f | 664 | |
6a8579d0 | 665 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 666 | { |
c951ad35 JB |
667 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
668 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
669 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
670 | struct tid_ampdu_tx *tid_tx; |
671 | int ret = 0; | |
b8695a8f | 672 | |
6a8579d0 | 673 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 674 | |
4253119a | 675 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
676 | return -EINVAL; |
677 | ||
b8695a8f JB |
678 | if (tid >= STA_TID_NUM) |
679 | return -EINVAL; | |
680 | ||
0ab33703 | 681 | spin_lock_bh(&sta->lock); |
40b275b6 | 682 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
683 | |
684 | if (!tid_tx) { | |
685 | ret = -ENOENT; | |
686 | goto unlock; | |
687 | } | |
688 | ||
689 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
690 | /* already in progress stopping it */ | |
691 | ret = 0; | |
692 | goto unlock; | |
693 | } | |
694 | ||
695 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
696 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
697 | ||
698 | unlock: | |
699 | spin_unlock_bh(&sta->lock); | |
700 | return ret; | |
b8695a8f JB |
701 | } |
702 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
703 | ||
c951ad35 | 704 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 705 | { |
c951ad35 JB |
706 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
707 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 708 | struct sta_info *sta; |
a622ab72 | 709 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 710 | |
b5878a2d JB |
711 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
712 | ||
b8695a8f JB |
713 | if (tid >= STA_TID_NUM) { |
714 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
715 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
716 | tid, STA_TID_NUM); | |
717 | #endif | |
718 | return; | |
719 | } | |
720 | ||
721 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
722 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
723 | ra, tid); | |
724 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
725 | ||
cfcdbde3 JB |
726 | mutex_lock(&local->sta_mtx); |
727 | ||
bc192f89 | 728 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f JB |
729 | if (!sta) { |
730 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
731 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
732 | #endif | |
cfcdbde3 | 733 | goto unlock; |
b8695a8f | 734 | } |
b8695a8f | 735 | |
cfcdbde3 | 736 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 737 | spin_lock_bh(&sta->lock); |
40b275b6 | 738 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
739 | |
740 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
741 | #ifdef CONFIG_MAC80211_HT_DEBUG |
742 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
743 | #endif | |
cfcdbde3 | 744 | goto unlock_sta; |
b8695a8f JB |
745 | } |
746 | ||
53f73c09 | 747 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
748 | ieee80211_send_delba(sta->sdata, ra, tid, |
749 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
750 | ||
a622ab72 JB |
751 | /* |
752 | * When we get here, the TX path will not be lockless any more wrt. | |
753 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
754 | * Thus it will block on getting the lock, if it occurs. So if we | |
755 | * stop the queue now, we will not get any more packets, and any | |
756 | * that might be being processed will wait for us here, thereby | |
757 | * guaranteeing that no packets go to the tid_tx pending queue any | |
758 | * more. | |
759 | */ | |
b8695a8f | 760 | |
a622ab72 | 761 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 762 | |
a622ab72 | 763 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 764 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 765 | |
a622ab72 | 766 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 767 | |
0744371a | 768 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 769 | |
cfcdbde3 | 770 | unlock_sta: |
a622ab72 | 771 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
772 | mutex_unlock(&sta->ampdu_mlme.mtx); |
773 | unlock: | |
774 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 775 | } |
b8695a8f | 776 | |
c951ad35 | 777 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
778 | const u8 *ra, u16 tid) |
779 | { | |
c951ad35 JB |
780 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
781 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
782 | struct ieee80211_ra_tid *ra_tid; |
783 | struct sk_buff *skb = dev_alloc_skb(0); | |
784 | ||
d15b8459 | 785 | if (unlikely(!skb)) |
b8695a8f | 786 | return; |
d15b8459 | 787 | |
b8695a8f JB |
788 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
789 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
790 | ra_tid->tid = tid; | |
791 | ||
c1475ca9 JB |
792 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
793 | skb_queue_tail(&sdata->skb_queue, skb); | |
794 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
795 | } |
796 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
797 | ||
86ab6c5a | 798 | |
b8695a8f JB |
799 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
800 | struct sta_info *sta, | |
801 | struct ieee80211_mgmt *mgmt, | |
802 | size_t len) | |
803 | { | |
a622ab72 | 804 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 805 | u16 capab, tid; |
0b01f030 | 806 | u8 buf_size; |
b8695a8f JB |
807 | |
808 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
809 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 810 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 811 | |
cfcdbde3 | 812 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 813 | |
40b275b6 | 814 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 815 | if (!tid_tx) |
8ade0082 | 816 | goto out; |
b8695a8f | 817 | |
a622ab72 | 818 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
819 | #ifdef CONFIG_MAC80211_HT_DEBUG |
820 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 821 | #endif |
8ade0082 | 822 | goto out; |
b8695a8f JB |
823 | } |
824 | ||
d305a655 | 825 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 826 | |
b8695a8f | 827 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 828 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 829 | #endif |
d305a655 NM |
830 | |
831 | /* | |
832 | * addba_resp_timer may have fired before we got here, and | |
833 | * caused WANT_STOP to be set. If the stop then was already | |
834 | * processed further, STOPPING might be set. | |
835 | */ | |
836 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
837 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
838 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
839 | printk(KERN_DEBUG | |
840 | "got addBA resp for tid %d but we already gave up\n", | |
841 | tid); | |
842 | #endif | |
843 | goto out; | |
844 | } | |
845 | ||
3ca97880 HS |
846 | /* |
847 | * IEEE 802.11-2007 7.3.1.14: | |
848 | * In an ADDBA Response frame, when the Status Code field | |
849 | * is set to 0, the Buffer Size subfield is set to a value | |
850 | * of at least 1. | |
851 | */ | |
b8695a8f | 852 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 853 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
854 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
855 | &tid_tx->state)) { | |
856 | /* ignore duplicate response */ | |
857 | goto out; | |
858 | } | |
b8695a8f | 859 | |
0b01f030 JB |
860 | tid_tx->buf_size = buf_size; |
861 | ||
a622ab72 | 862 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 863 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 864 | |
b1720231 | 865 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 NM |
866 | |
867 | if (tid_tx->timeout) | |
868 | mod_timer(&tid_tx->session_timer, | |
869 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
870 | ||
b8695a8f | 871 | } else { |
53f73c09 JB |
872 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
873 | true); | |
b8695a8f | 874 | } |
2171abc5 | 875 | |
2171abc5 | 876 | out: |
cfcdbde3 | 877 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 878 | } |