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; | |
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 | ||
cf6bb79a | 110 | ieee80211_tx_skb_tid(sdata, skb, tid); |
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 | 138 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
cf6bb79a | 139 | ieee80211_tx_skb_tid(sdata, skb, tid); |
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 | ||
d63e9ae3 JP |
187 | ht_vdbg("Tx BA session stop requested for %pM tid %u\n", |
188 | sta->sta.addr, tid); | |
827d42c9 | 189 | |
44271488 | 190 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 191 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 192 | |
a622ab72 JB |
193 | /* |
194 | * After this packets are no longer handed right through | |
195 | * to the driver but are put onto tid_tx->pending instead, | |
196 | * with locking to ensure proper access. | |
197 | */ | |
198 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 199 | |
2a1e0fd1 EG |
200 | /* |
201 | * There might be a few packets being processed right now (on | |
202 | * another CPU) that have already gotten past the aggregation | |
203 | * check when it was still OPERATIONAL and consequently have | |
204 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
205 | * call into the driver at the same time or even before the | |
206 | * TX paths calls into it, which could confuse the driver. | |
207 | * | |
208 | * Wait for all currently running TX paths to finish before | |
209 | * telling the driver. New packets will not go through since | |
210 | * the aggregation session is no longer OPERATIONAL. | |
211 | */ | |
212 | synchronize_net(); | |
213 | ||
a622ab72 | 214 | tid_tx->stop_initiator = initiator; |
53f73c09 | 215 | tid_tx->tx_stop = tx; |
23e6a7ea | 216 | |
12375ef9 | 217 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 218 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 219 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
220 | |
221 | /* HW shall not deny going back to legacy */ | |
222 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
223 | /* |
224 | * We may have pending packets get stuck in this case... | |
225 | * Not bothering with a workaround for now. | |
226 | */ | |
23e6a7ea JB |
227 | } |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
b8695a8f JB |
232 | /* |
233 | * After sending add Block Ack request we activated a timer until | |
234 | * add Block Ack response will arrive from the recipient. | |
235 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
236 | */ | |
237 | static void sta_addba_resp_timer_expired(unsigned long data) | |
238 | { | |
239 | /* not an elegant detour, but there is no choice as the timer passes | |
240 | * only one argument, and both sta_info and TID are needed, so init | |
241 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
242 | * array gives the sta through container_of */ | |
243 | u16 tid = *(u8 *)data; | |
23e6a7ea | 244 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 245 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 246 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 247 | |
b8695a8f | 248 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
249 | rcu_read_lock(); |
250 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
251 | if (!tid_tx || |
252 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 253 | rcu_read_unlock(); |
d63e9ae3 JP |
254 | ht_vdbg("timer expired on tid %d but we are not (or no longer) expecting addBA response there\n", |
255 | tid); | |
23e6a7ea | 256 | return; |
b8695a8f JB |
257 | } |
258 | ||
d63e9ae3 | 259 | ht_vdbg("addBA response timer expired on tid %d\n", tid); |
b8695a8f | 260 | |
83a5cbf7 JB |
261 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
262 | rcu_read_unlock(); | |
b8695a8f JB |
263 | } |
264 | ||
96f5e66e JB |
265 | static inline int ieee80211_ac_from_tid(int tid) |
266 | { | |
267 | return ieee802_1d_to_ac[tid & 7]; | |
268 | } | |
269 | ||
a6a67db2 JB |
270 | /* |
271 | * When multiple aggregation sessions on multiple stations | |
272 | * are being created/destroyed simultaneously, we need to | |
273 | * refcount the global queue stop caused by that in order | |
274 | * to not get into a situation where one of the aggregation | |
275 | * setup or teardown re-enables queues before the other is | |
276 | * ready to handle that. | |
277 | * | |
278 | * These two functions take care of this issue by keeping | |
279 | * a global "agg_queue_stop" refcount. | |
280 | */ | |
281 | static void __acquires(agg_queue) | |
3a25a8c8 | 282 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
a6a67db2 | 283 | { |
3a25a8c8 | 284 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
a6a67db2 | 285 | |
3a25a8c8 | 286 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
a6a67db2 | 287 | ieee80211_stop_queue_by_reason( |
3a25a8c8 | 288 | &sdata->local->hw, queue, |
a6a67db2 JB |
289 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
290 | __acquire(agg_queue); | |
291 | } | |
292 | ||
293 | static void __releases(agg_queue) | |
3a25a8c8 | 294 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
a6a67db2 | 295 | { |
3a25a8c8 | 296 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
a6a67db2 | 297 | |
3a25a8c8 | 298 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) |
a6a67db2 | 299 | ieee80211_wake_queue_by_reason( |
3a25a8c8 | 300 | &sdata->local->hw, queue, |
a6a67db2 JB |
301 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
302 | __release(agg_queue); | |
303 | } | |
304 | ||
15062e6a JB |
305 | /* |
306 | * splice packets from the STA's pending to the local pending, | |
307 | * requires a call to ieee80211_agg_splice_finish later | |
308 | */ | |
309 | static void __acquires(agg_queue) | |
3a25a8c8 | 310 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, |
15062e6a JB |
311 | struct tid_ampdu_tx *tid_tx, u16 tid) |
312 | { | |
3a25a8c8 JB |
313 | struct ieee80211_local *local = sdata->local; |
314 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
15062e6a JB |
315 | unsigned long flags; |
316 | ||
3a25a8c8 | 317 | ieee80211_stop_queue_agg(sdata, tid); |
15062e6a JB |
318 | |
319 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" | |
320 | " from the pending queue\n", tid)) | |
321 | return; | |
322 | ||
323 | if (!skb_queue_empty(&tid_tx->pending)) { | |
324 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
325 | /* copy over remaining packets */ | |
326 | skb_queue_splice_tail_init(&tid_tx->pending, | |
327 | &local->pending[queue]); | |
328 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
329 | } | |
330 | } | |
331 | ||
332 | static void __releases(agg_queue) | |
3a25a8c8 | 333 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) |
15062e6a | 334 | { |
3a25a8c8 | 335 | ieee80211_wake_queue_agg(sdata, tid); |
15062e6a JB |
336 | } |
337 | ||
67c282c0 | 338 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 339 | { |
40b275b6 | 340 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
341 | struct ieee80211_local *local = sta->local; |
342 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
343 | u16 start_seq_num; | |
344 | int ret; | |
345 | ||
40b275b6 | 346 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 347 | |
0ab33703 | 348 | /* |
15062e6a JB |
349 | * Start queuing up packets for this aggregation session. |
350 | * We're going to release them once the driver is OK with | |
351 | * that. | |
0ab33703 | 352 | */ |
0ab33703 JB |
353 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
354 | ||
355 | /* | |
15062e6a JB |
356 | * Make sure no packets are being processed. This ensures that |
357 | * we have a valid starting sequence number and that in-flight | |
358 | * packets have been flushed out and no packets for this TID | |
359 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 360 | */ |
cfcdbde3 JB |
361 | synchronize_net(); |
362 | ||
0ab33703 JB |
363 | start_seq_num = sta->tid_seq[tid] >> 4; |
364 | ||
365 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 366 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 | 367 | if (ret) { |
d63e9ae3 | 368 | ht_vdbg("BA request denied - HW unavailable for tid %d\n", tid); |
cfcdbde3 | 369 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 370 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 371 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 372 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
373 | spin_unlock_bh(&sta->lock); |
374 | ||
0744371a | 375 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
376 | return; |
377 | } | |
378 | ||
0ab33703 JB |
379 | /* activate the timer for the recipient's addBA response */ |
380 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
d63e9ae3 | 381 | ht_vdbg("activated addBA response timer on tid %d\n", tid); |
0ab33703 | 382 | |
cfcdbde3 | 383 | spin_lock_bh(&sta->lock); |
84381b4e | 384 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
0ab33703 | 385 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 386 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
387 | |
388 | /* send AddBA request */ | |
389 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
390 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
391 | local->hw.max_tx_aggregation_subframes, |
392 | tid_tx->timeout); | |
0ab33703 JB |
393 | } |
394 | ||
285fa695 NM |
395 | /* |
396 | * After accepting the AddBA Response we activated a timer, | |
397 | * resetting it after each frame that we send. | |
398 | */ | |
399 | static void sta_tx_agg_session_timer_expired(unsigned long data) | |
400 | { | |
401 | /* not an elegant detour, but there is no choice as the timer passes | |
402 | * only one argument, and various sta_info are needed here, so init | |
403 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
404 | * array gives the sta through container_of */ | |
405 | u8 *ptid = (u8 *)data; | |
406 | u8 *timer_to_id = ptid - *ptid; | |
407 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
408 | timer_to_tid[0]); | |
12d3952f FF |
409 | struct tid_ampdu_tx *tid_tx; |
410 | unsigned long timeout; | |
411 | ||
9e73dee7 JB |
412 | rcu_read_lock(); |
413 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); | |
414 | if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
415 | rcu_read_unlock(); | |
12d3952f | 416 | return; |
9e73dee7 | 417 | } |
12d3952f FF |
418 | |
419 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
420 | if (time_is_after_jiffies(timeout)) { | |
421 | mod_timer(&tid_tx->session_timer, timeout); | |
9e73dee7 | 422 | rcu_read_unlock(); |
12d3952f FF |
423 | return; |
424 | } | |
285fa695 | 425 | |
9e73dee7 JB |
426 | rcu_read_unlock(); |
427 | ||
d63e9ae3 | 428 | ht_vdbg("tx session timer expired on tid %d\n", (u16)*ptid); |
285fa695 NM |
429 | |
430 | ieee80211_stop_tx_ba_session(&sta->sta, *ptid); | |
431 | } | |
432 | ||
bd2ce6e4 SM |
433 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
434 | u16 timeout) | |
b8695a8f | 435 | { |
c951ad35 JB |
436 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
437 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
438 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 439 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 440 | int ret = 0; |
b8695a8f | 441 | |
b5878a2d JB |
442 | trace_api_start_tx_ba_session(pubsta, tid); |
443 | ||
23e6a7ea JB |
444 | if (WARN_ON(!local->ops->ampdu_action)) |
445 | return -EINVAL; | |
446 | ||
c951ad35 | 447 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
448 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
449 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
450 | return -EINVAL; |
451 | ||
d63e9ae3 JP |
452 | ht_vdbg("Open BA session requested for %pM tid %u\n", |
453 | pubsta->addr, tid); | |
b8695a8f | 454 | |
c951ad35 | 455 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 456 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 457 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
458 | sdata->vif.type != NL80211_IFTYPE_AP && |
459 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 460 | return -EINVAL; |
8abd3f9b | 461 | |
c2c98fde | 462 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
d63e9ae3 | 463 | ht_vdbg("BA sessions blocked - Denying BA session request\n"); |
c951ad35 | 464 | return -EINVAL; |
722f069a S |
465 | } |
466 | ||
ff3cc5f4 SW |
467 | /* |
468 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
469 | * member of an IBSS, and has no other existing Block Ack agreement | |
470 | * with the recipient STA, then the initiating STA shall transmit a | |
471 | * Probe Request frame to the recipient STA and shall not transmit an | |
472 | * ADDBA Request frame unless it receives a Probe Response frame | |
473 | * from the recipient within dot11ADDBAFailureTimeout. | |
474 | * | |
475 | * The probe request mechanism for ADDBA is currently not implemented, | |
476 | * but we only build up Block Ack session with HT STAs. This information | |
477 | * is set when we receive a bss info from a probe response or a beacon. | |
478 | */ | |
479 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
480 | !sta->sta.ht_cap.ht_supported) { | |
d63e9ae3 JP |
481 | ht_vdbg("BA request denied - IBSS STA %pM does not advertise HT support\n", |
482 | pubsta->addr); | |
ff3cc5f4 SW |
483 | return -EINVAL; |
484 | } | |
485 | ||
b8695a8f JB |
486 | spin_lock_bh(&sta->lock); |
487 | ||
488 | /* we have tried too many times, receiver does not want A-MPDU */ | |
489 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
490 | ret = -EBUSY; | |
84381b4e NM |
491 | goto err_unlock_sta; |
492 | } | |
493 | ||
494 | /* | |
495 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
496 | * will spread our requests in time to avoid stalling connection | |
497 | * for too long | |
498 | */ | |
499 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
500 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
501 | HT_AGG_RETRIES_PERIOD)) { | |
d63e9ae3 JP |
502 | ht_vdbg("BA request denied - waiting a grace period after %d failed requests on tid %u\n", |
503 | sta->ampdu_mlme.addba_req_num[tid], tid); | |
84381b4e | 504 | ret = -EBUSY; |
b8695a8f JB |
505 | goto err_unlock_sta; |
506 | } | |
507 | ||
40b275b6 | 508 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 509 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 510 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
d63e9ae3 JP |
511 | ht_vdbg("BA request denied - session is not idle on tid %u\n", |
512 | tid); | |
b8695a8f JB |
513 | ret = -EAGAIN; |
514 | goto err_unlock_sta; | |
515 | } | |
516 | ||
517 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
518 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
519 | if (!tid_tx) { | |
b8695a8f | 520 | ret = -ENOMEM; |
0ab33703 | 521 | goto err_unlock_sta; |
b8695a8f | 522 | } |
96f5e66e | 523 | |
a622ab72 | 524 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 525 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 526 | |
bd2ce6e4 SM |
527 | tid_tx->timeout = timeout; |
528 | ||
285fa695 | 529 | /* response timer */ |
a622ab72 JB |
530 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
531 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
532 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 533 | |
285fa695 NM |
534 | /* tx timer */ |
535 | tid_tx->session_timer.function = sta_tx_agg_session_timer_expired; | |
536 | tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
12d3952f | 537 | init_timer_deferrable(&tid_tx->session_timer); |
285fa695 | 538 | |
0ab33703 | 539 | /* assign a dialog token */ |
b8695a8f | 540 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 541 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 542 | |
ec034b20 JB |
543 | /* |
544 | * Finally, assign it to the start array; the work item will | |
545 | * collect it and move it to the normal array. | |
546 | */ | |
547 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 548 | |
0ab33703 | 549 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 550 | |
0ab33703 | 551 | /* this flow continues off the work */ |
96f5e66e | 552 | err_unlock_sta: |
b8695a8f | 553 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
554 | return ret; |
555 | } | |
556 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
557 | ||
b1720231 JB |
558 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
559 | struct sta_info *sta, u16 tid) | |
560 | { | |
40b275b6 JB |
561 | struct tid_ampdu_tx *tid_tx; |
562 | ||
cfcdbde3 | 563 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 564 | |
40b275b6 JB |
565 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
566 | ||
d63e9ae3 | 567 | ht_vdbg("Aggregation is on for tid %d\n", tid); |
b1720231 | 568 | |
cfcdbde3 JB |
569 | drv_ampdu_action(local, sta->sdata, |
570 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 571 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
572 | |
573 | /* | |
574 | * synchronize with TX path, while splicing the TX path | |
575 | * should block so it won't put more packets onto pending. | |
576 | */ | |
577 | spin_lock_bh(&sta->lock); | |
578 | ||
3a25a8c8 | 579 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 580 | /* |
a622ab72 JB |
581 | * Now mark as operational. This will be visible |
582 | * in the TX path, and lets it go lock-free in | |
583 | * the common case. | |
cd8ffc80 | 584 | */ |
40b275b6 | 585 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 586 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 587 | |
cfcdbde3 | 588 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
589 | } |
590 | ||
c951ad35 | 591 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 592 | { |
c951ad35 JB |
593 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
594 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 595 | struct sta_info *sta; |
a622ab72 | 596 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 597 | |
b5878a2d JB |
598 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
599 | ||
b8695a8f | 600 | if (tid >= STA_TID_NUM) { |
d63e9ae3 | 601 | ht_vdbg("Bad TID value: tid = %d (>= %d)\n", tid, STA_TID_NUM); |
b8695a8f JB |
602 | return; |
603 | } | |
604 | ||
cfcdbde3 | 605 | mutex_lock(&local->sta_mtx); |
bc192f89 | 606 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 607 | if (!sta) { |
cfcdbde3 | 608 | mutex_unlock(&local->sta_mtx); |
d63e9ae3 | 609 | ht_vdbg("Could not find station: %pM\n", ra); |
b8695a8f JB |
610 | return; |
611 | } | |
612 | ||
cfcdbde3 | 613 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 614 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 615 | |
a622ab72 | 616 | if (WARN_ON(!tid_tx)) { |
d63e9ae3 | 617 | ht_vdbg("addBA was not requested!\n"); |
cfcdbde3 | 618 | goto unlock; |
b8695a8f JB |
619 | } |
620 | ||
a622ab72 | 621 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 622 | goto unlock; |
b8695a8f | 623 | |
a622ab72 | 624 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 625 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 626 | |
cfcdbde3 JB |
627 | unlock: |
628 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
629 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 630 | } |
b8695a8f | 631 | |
c951ad35 | 632 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
633 | const u8 *ra, u16 tid) |
634 | { | |
c951ad35 JB |
635 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
636 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
637 | struct ieee80211_ra_tid *ra_tid; |
638 | struct sk_buff *skb = dev_alloc_skb(0); | |
639 | ||
d15b8459 | 640 | if (unlikely(!skb)) |
86ab6c5a | 641 | return; |
d15b8459 | 642 | |
86ab6c5a JB |
643 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
644 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
645 | ra_tid->tid = tid; | |
646 | ||
c1475ca9 JB |
647 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
648 | skb_queue_tail(&sdata->skb_queue, skb); | |
649 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
650 | } |
651 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
652 | ||
849b7967 | 653 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
654 | enum ieee80211_back_parties initiator, |
655 | bool tx) | |
849b7967 | 656 | { |
849b7967 JB |
657 | int ret; |
658 | ||
cfcdbde3 | 659 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 660 | |
53f73c09 | 661 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 662 | |
cfcdbde3 JB |
663 | mutex_unlock(&sta->ampdu_mlme.mtx); |
664 | ||
849b7967 JB |
665 | return ret; |
666 | } | |
b8695a8f | 667 | |
6a8579d0 | 668 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 669 | { |
c951ad35 JB |
670 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
671 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
672 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
673 | struct tid_ampdu_tx *tid_tx; |
674 | int ret = 0; | |
b8695a8f | 675 | |
6a8579d0 | 676 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 677 | |
4253119a | 678 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
679 | return -EINVAL; |
680 | ||
b8695a8f JB |
681 | if (tid >= STA_TID_NUM) |
682 | return -EINVAL; | |
683 | ||
0ab33703 | 684 | spin_lock_bh(&sta->lock); |
40b275b6 | 685 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
686 | |
687 | if (!tid_tx) { | |
688 | ret = -ENOENT; | |
689 | goto unlock; | |
690 | } | |
691 | ||
692 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
693 | /* already in progress stopping it */ | |
694 | ret = 0; | |
695 | goto unlock; | |
696 | } | |
697 | ||
698 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
699 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
700 | ||
701 | unlock: | |
702 | spin_unlock_bh(&sta->lock); | |
703 | return ret; | |
b8695a8f JB |
704 | } |
705 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
706 | ||
c951ad35 | 707 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 708 | { |
c951ad35 JB |
709 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
710 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 711 | struct sta_info *sta; |
a622ab72 | 712 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 713 | |
b5878a2d JB |
714 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
715 | ||
b8695a8f | 716 | if (tid >= STA_TID_NUM) { |
d63e9ae3 | 717 | ht_vdbg("Bad TID value: tid = %d (>= %d)\n", tid, STA_TID_NUM); |
b8695a8f JB |
718 | return; |
719 | } | |
720 | ||
d63e9ae3 | 721 | ht_vdbg("Stopping Tx BA session for %pM tid %d\n", ra, tid); |
b8695a8f | 722 | |
cfcdbde3 JB |
723 | mutex_lock(&local->sta_mtx); |
724 | ||
bc192f89 | 725 | sta = sta_info_get_bss(sdata, ra); |
b8695a8f | 726 | if (!sta) { |
d63e9ae3 | 727 | ht_vdbg("Could not find station: %pM\n", ra); |
cfcdbde3 | 728 | goto unlock; |
b8695a8f | 729 | } |
b8695a8f | 730 | |
cfcdbde3 | 731 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 732 | spin_lock_bh(&sta->lock); |
40b275b6 | 733 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
734 | |
735 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
d63e9ae3 | 736 | ht_vdbg("unexpected callback to A-MPDU stop\n"); |
cfcdbde3 | 737 | goto unlock_sta; |
b8695a8f JB |
738 | } |
739 | ||
53f73c09 | 740 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
741 | ieee80211_send_delba(sta->sdata, ra, tid, |
742 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
743 | ||
a622ab72 JB |
744 | /* |
745 | * When we get here, the TX path will not be lockless any more wrt. | |
746 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
747 | * Thus it will block on getting the lock, if it occurs. So if we | |
748 | * stop the queue now, we will not get any more packets, and any | |
749 | * that might be being processed will wait for us here, thereby | |
750 | * guaranteeing that no packets go to the tid_tx pending queue any | |
751 | * more. | |
752 | */ | |
b8695a8f | 753 | |
3a25a8c8 | 754 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
96f5e66e | 755 | |
a622ab72 | 756 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 757 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 758 | |
3a25a8c8 | 759 | ieee80211_agg_splice_finish(sta->sdata, tid); |
cd8ffc80 | 760 | |
0744371a | 761 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 762 | |
cfcdbde3 | 763 | unlock_sta: |
a622ab72 | 764 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
765 | mutex_unlock(&sta->ampdu_mlme.mtx); |
766 | unlock: | |
767 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 768 | } |
b8695a8f | 769 | |
c951ad35 | 770 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
771 | const u8 *ra, u16 tid) |
772 | { | |
c951ad35 JB |
773 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
774 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
775 | struct ieee80211_ra_tid *ra_tid; |
776 | struct sk_buff *skb = dev_alloc_skb(0); | |
777 | ||
d15b8459 | 778 | if (unlikely(!skb)) |
b8695a8f | 779 | return; |
d15b8459 | 780 | |
b8695a8f JB |
781 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
782 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
783 | ra_tid->tid = tid; | |
784 | ||
c1475ca9 JB |
785 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
786 | skb_queue_tail(&sdata->skb_queue, skb); | |
787 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
788 | } |
789 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
790 | ||
86ab6c5a | 791 | |
b8695a8f JB |
792 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
793 | struct sta_info *sta, | |
794 | struct ieee80211_mgmt *mgmt, | |
795 | size_t len) | |
796 | { | |
a622ab72 | 797 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 798 | u16 capab, tid; |
0b01f030 | 799 | u8 buf_size; |
b8695a8f JB |
800 | |
801 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
802 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 803 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 804 | |
cfcdbde3 | 805 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 806 | |
40b275b6 | 807 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 808 | if (!tid_tx) |
8ade0082 | 809 | goto out; |
b8695a8f | 810 | |
a622ab72 | 811 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
d63e9ae3 | 812 | ht_vdbg("wrong addBA response token, tid %d\n", tid); |
8ade0082 | 813 | goto out; |
b8695a8f JB |
814 | } |
815 | ||
d305a655 | 816 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 817 | |
d63e9ae3 | 818 | ht_vdbg("switched off addBA timer for tid %d\n", tid); |
d305a655 NM |
819 | |
820 | /* | |
821 | * addba_resp_timer may have fired before we got here, and | |
822 | * caused WANT_STOP to be set. If the stop then was already | |
823 | * processed further, STOPPING might be set. | |
824 | */ | |
825 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
826 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
d63e9ae3 JP |
827 | ht_vdbg("got addBA resp for tid %d but we already gave up\n", |
828 | tid); | |
d305a655 NM |
829 | goto out; |
830 | } | |
831 | ||
3ca97880 HS |
832 | /* |
833 | * IEEE 802.11-2007 7.3.1.14: | |
834 | * In an ADDBA Response frame, when the Status Code field | |
835 | * is set to 0, the Buffer Size subfield is set to a value | |
836 | * of at least 1. | |
837 | */ | |
b8695a8f | 838 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 839 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
840 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
841 | &tid_tx->state)) { | |
842 | /* ignore duplicate response */ | |
843 | goto out; | |
844 | } | |
b8695a8f | 845 | |
0b01f030 JB |
846 | tid_tx->buf_size = buf_size; |
847 | ||
a622ab72 | 848 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 849 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 850 | |
b1720231 | 851 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 852 | |
12d3952f | 853 | if (tid_tx->timeout) { |
285fa695 NM |
854 | mod_timer(&tid_tx->session_timer, |
855 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
856 | tid_tx->last_tx = jiffies; |
857 | } | |
285fa695 | 858 | |
b8695a8f | 859 | } else { |
53f73c09 JB |
860 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
861 | true); | |
b8695a8f | 862 | } |
2171abc5 | 863 | |
2171abc5 | 864 | out: |
cfcdbde3 | 865 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 866 | } |