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Commit | Line | Data |
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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2007-2009, Intel Corporation | |
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> |
b8695a8f JB |
18 | #include <net/mac80211.h> |
19 | #include "ieee80211_i.h" | |
24487981 | 20 | #include "driver-ops.h" |
b8695a8f JB |
21 | #include "wme.h" |
22 | ||
86ab6c5a JB |
23 | /** |
24 | * DOC: TX aggregation | |
25 | * | |
26 | * Aggregation on the TX side requires setting the hardware flag | |
27 | * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues | |
28 | * hardware parameter to the number of hardware AMPDU queues. If there are no | |
29 | * hardware queues then the driver will (currently) have to do all frame | |
30 | * buffering. | |
31 | * | |
32 | * When TX aggregation is started by some subsystem (usually the rate control | |
33 | * algorithm would be appropriate) by calling the | |
34 | * ieee80211_start_tx_ba_session() function, the driver will be notified via | |
35 | * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. | |
36 | * | |
37 | * In response to that, the driver is later required to call the | |
38 | * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) | |
39 | * function, which will start the aggregation session. | |
40 | * | |
41 | * Similarly, when the aggregation session is stopped by | |
42 | * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will | |
43 | * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the | |
44 | * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() | |
45 | * (or ieee80211_stop_tx_ba_cb_irqsafe()). | |
46 | */ | |
47 | ||
b8695a8f JB |
48 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
49 | const u8 *da, u16 tid, | |
50 | u8 dialog_token, u16 start_seq_num, | |
51 | u16 agg_size, u16 timeout) | |
52 | { | |
53 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
54 | struct sk_buff *skb; |
55 | struct ieee80211_mgmt *mgmt; | |
56 | u16 capab; | |
57 | ||
58 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
59 | ||
60 | if (!skb) { | |
61 | printk(KERN_ERR "%s: failed to allocate buffer " | |
47846c9b | 62 | "for addba request frame\n", sdata->name); |
b8695a8f JB |
63 | return; |
64 | } | |
65 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
66 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
67 | memset(mgmt, 0, 24); | |
68 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 69 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
70 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
71 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 72 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
73 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
74 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
75 | |
76 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
77 | IEEE80211_STYPE_ACTION); | |
78 | ||
79 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
80 | ||
81 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
82 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
83 | ||
84 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
85 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
86 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
87 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
88 | ||
89 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
90 | ||
91 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
92 | mgmt->u.action.u.addba_req.start_seq_num = | |
93 | cpu_to_le16(start_seq_num << 4); | |
94 | ||
62ae67be | 95 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
96 | } |
97 | ||
98 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
99 | { | |
100 | struct ieee80211_local *local = sdata->local; | |
101 | struct sk_buff *skb; | |
102 | struct ieee80211_bar *bar; | |
103 | u16 bar_control = 0; | |
104 | ||
105 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
106 | if (!skb) { | |
107 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
47846c9b | 108 | "bar frame\n", sdata->name); |
b8695a8f JB |
109 | return; |
110 | } | |
111 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
112 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
113 | memset(bar, 0, sizeof(*bar)); | |
114 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
115 | IEEE80211_STYPE_BACK_REQ); | |
116 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 117 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
118 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
119 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
120 | bar_control |= (u16)(tid << 12); | |
121 | bar->control = cpu_to_le16(bar_control); | |
122 | bar->start_seq_num = cpu_to_le16(ssn); | |
123 | ||
62ae67be JB |
124 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
125 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f JB |
126 | } |
127 | ||
a622ab72 JB |
128 | static void kfree_tid_tx(struct rcu_head *rcu_head) |
129 | { | |
130 | struct tid_ampdu_tx *tid_tx = | |
131 | container_of(rcu_head, struct tid_ampdu_tx, rcu_head); | |
132 | ||
133 | kfree(tid_tx); | |
134 | } | |
135 | ||
67c282c0 JB |
136 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
137 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 138 | { |
849b7967 | 139 | struct ieee80211_local *local = sta->local; |
a622ab72 | 140 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
23e6a7ea | 141 | int ret; |
a622ab72 JB |
142 | |
143 | lockdep_assert_held(&sta->lock); | |
144 | ||
145 | if (WARN_ON(!tid_tx)) | |
146 | return -ENOENT; | |
23e6a7ea | 147 | |
0ab33703 JB |
148 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
149 | /* not even started yet! */ | |
150 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
151 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); | |
152 | return 0; | |
153 | } | |
154 | ||
827d42c9 JB |
155 | #ifdef CONFIG_MAC80211_HT_DEBUG |
156 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
157 | sta->sta.addr, tid); | |
158 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
159 | ||
a622ab72 | 160 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 161 | |
a622ab72 JB |
162 | /* |
163 | * After this packets are no longer handed right through | |
164 | * to the driver but are put onto tid_tx->pending instead, | |
165 | * with locking to ensure proper access. | |
166 | */ | |
167 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 168 | |
a622ab72 | 169 | tid_tx->stop_initiator = initiator; |
23e6a7ea | 170 | |
12375ef9 | 171 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 172 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 173 | &sta->sta, tid, NULL); |
23e6a7ea JB |
174 | |
175 | /* HW shall not deny going back to legacy */ | |
176 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
177 | /* |
178 | * We may have pending packets get stuck in this case... | |
179 | * Not bothering with a workaround for now. | |
180 | */ | |
23e6a7ea JB |
181 | } |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
b8695a8f JB |
186 | /* |
187 | * After sending add Block Ack request we activated a timer until | |
188 | * add Block Ack response will arrive from the recipient. | |
189 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
190 | */ | |
191 | static void sta_addba_resp_timer_expired(unsigned long data) | |
192 | { | |
193 | /* not an elegant detour, but there is no choice as the timer passes | |
194 | * only one argument, and both sta_info and TID are needed, so init | |
195 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
196 | * array gives the sta through container_of */ | |
197 | u16 tid = *(u8 *)data; | |
23e6a7ea | 198 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 199 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 200 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 201 | |
b8695a8f | 202 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
203 | rcu_read_lock(); |
204 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
205 | if (!tid_tx || |
206 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 207 | rcu_read_unlock(); |
b8695a8f JB |
208 | #ifdef CONFIG_MAC80211_HT_DEBUG |
209 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 210 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 211 | tid); |
b8695a8f | 212 | #endif |
23e6a7ea | 213 | return; |
b8695a8f JB |
214 | } |
215 | ||
216 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
217 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
218 | #endif | |
219 | ||
83a5cbf7 JB |
220 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
221 | rcu_read_unlock(); | |
b8695a8f JB |
222 | } |
223 | ||
96f5e66e JB |
224 | static inline int ieee80211_ac_from_tid(int tid) |
225 | { | |
226 | return ieee802_1d_to_ac[tid & 7]; | |
227 | } | |
228 | ||
a6a67db2 JB |
229 | /* |
230 | * When multiple aggregation sessions on multiple stations | |
231 | * are being created/destroyed simultaneously, we need to | |
232 | * refcount the global queue stop caused by that in order | |
233 | * to not get into a situation where one of the aggregation | |
234 | * setup or teardown re-enables queues before the other is | |
235 | * ready to handle that. | |
236 | * | |
237 | * These two functions take care of this issue by keeping | |
238 | * a global "agg_queue_stop" refcount. | |
239 | */ | |
240 | static void __acquires(agg_queue) | |
241 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
242 | { | |
243 | int queue = ieee80211_ac_from_tid(tid); | |
244 | ||
245 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
246 | ieee80211_stop_queue_by_reason( | |
247 | &local->hw, queue, | |
248 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
249 | __acquire(agg_queue); | |
250 | } | |
251 | ||
252 | static void __releases(agg_queue) | |
253 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
254 | { | |
255 | int queue = ieee80211_ac_from_tid(tid); | |
256 | ||
257 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
258 | ieee80211_wake_queue_by_reason( | |
259 | &local->hw, queue, | |
260 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
261 | __release(agg_queue); | |
262 | } | |
263 | ||
67c282c0 | 264 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 JB |
265 | { |
266 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
267 | struct ieee80211_local *local = sta->local; | |
268 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
269 | u16 start_seq_num; | |
270 | int ret; | |
271 | ||
272 | /* | |
273 | * While we're asking the driver about the aggregation, | |
274 | * stop the AC queue so that we don't have to worry | |
275 | * about frames that came in while we were doing that, | |
276 | * which would require us to put them to the AC pending | |
277 | * afterwards which just makes the code more complex. | |
278 | */ | |
279 | ieee80211_stop_queue_agg(local, tid); | |
280 | ||
281 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
282 | ||
283 | /* | |
284 | * This might be off by one due to a race that we can't | |
285 | * really prevent here without synchronize_net() which | |
286 | * can't be called now. | |
287 | */ | |
288 | start_seq_num = sta->tid_seq[tid] >> 4; | |
289 | ||
290 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
291 | &sta->sta, tid, &start_seq_num); | |
292 | if (ret) { | |
293 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
294 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
295 | " tid %d\n", tid); | |
296 | #endif | |
297 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
298 | ieee80211_wake_queue_agg(local, tid); | |
299 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); | |
300 | return; | |
301 | } | |
302 | ||
303 | /* we can take packets again now */ | |
304 | ieee80211_wake_queue_agg(local, tid); | |
305 | ||
306 | /* activate the timer for the recipient's addBA response */ | |
307 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
308 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
309 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
310 | #endif | |
311 | ||
312 | sta->ampdu_mlme.addba_req_num[tid]++; | |
313 | ||
314 | /* send AddBA request */ | |
315 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
316 | tid_tx->dialog_token, start_seq_num, | |
317 | 0x40, 5000); | |
318 | } | |
319 | ||
c951ad35 | 320 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 321 | { |
c951ad35 JB |
322 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
323 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
324 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 325 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 326 | int ret = 0; |
b8695a8f | 327 | |
b5878a2d JB |
328 | trace_api_start_tx_ba_session(pubsta, tid); |
329 | ||
23e6a7ea JB |
330 | if (WARN_ON(!local->ops->ampdu_action)) |
331 | return -EINVAL; | |
332 | ||
c951ad35 JB |
333 | if ((tid >= STA_TID_NUM) || |
334 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
335 | return -EINVAL; |
336 | ||
337 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
338 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 339 | pubsta->addr, tid); |
b8695a8f JB |
340 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
341 | ||
8abd3f9b JB |
342 | /* |
343 | * The aggregation code is not prepared to handle | |
344 | * anything but STA/AP due to the BSSID handling. | |
345 | * IBSS could work in the code but isn't supported | |
346 | * by drivers or the standard. | |
347 | */ | |
c951ad35 JB |
348 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
349 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
350 | sdata->vif.type != NL80211_IFTYPE_AP) | |
351 | return -EINVAL; | |
8abd3f9b | 352 | |
618f356b | 353 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 354 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 355 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
356 | "Denying BA session request\n"); |
357 | #endif | |
c951ad35 | 358 | return -EINVAL; |
722f069a S |
359 | } |
360 | ||
b8695a8f JB |
361 | spin_lock_bh(&sta->lock); |
362 | ||
363 | /* we have tried too many times, receiver does not want A-MPDU */ | |
364 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
365 | ret = -EBUSY; | |
366 | goto err_unlock_sta; | |
367 | } | |
368 | ||
a622ab72 | 369 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 370 | /* check if the TID is not in aggregation flow already */ |
a622ab72 | 371 | if (tid_tx) { |
b8695a8f JB |
372 | #ifdef CONFIG_MAC80211_HT_DEBUG |
373 | printk(KERN_DEBUG "BA request denied - session is not " | |
374 | "idle on tid %u\n", tid); | |
375 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
376 | ret = -EAGAIN; | |
377 | goto err_unlock_sta; | |
378 | } | |
379 | ||
380 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
381 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
382 | if (!tid_tx) { | |
b8695a8f JB |
383 | #ifdef CONFIG_MAC80211_HT_DEBUG |
384 | if (net_ratelimit()) | |
385 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
386 | tid); | |
387 | #endif | |
388 | ret = -ENOMEM; | |
0ab33703 | 389 | goto err_unlock_sta; |
b8695a8f | 390 | } |
96f5e66e | 391 | |
a622ab72 | 392 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 393 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 394 | |
b8695a8f | 395 | /* Tx timer */ |
a622ab72 JB |
396 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
397 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
398 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 399 | |
0ab33703 | 400 | /* assign a dialog token */ |
b8695a8f | 401 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 402 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 403 | |
0ab33703 JB |
404 | /* finally, assign it to the array */ |
405 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
51a0d38d | 406 | |
0ab33703 | 407 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 408 | |
0ab33703 | 409 | /* this flow continues off the work */ |
96f5e66e | 410 | err_unlock_sta: |
b8695a8f | 411 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
412 | return ret; |
413 | } | |
414 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
415 | ||
cd8ffc80 JB |
416 | /* |
417 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 418 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 419 | */ |
a6a67db2 JB |
420 | static void __acquires(agg_queue) |
421 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
422 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 423 | { |
a6a67db2 | 424 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 425 | unsigned long flags; |
cd8ffc80 | 426 | |
a6a67db2 | 427 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 428 | |
a622ab72 JB |
429 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
430 | " from the pending queue\n", tid)) | |
416fbdff LR |
431 | return; |
432 | ||
a622ab72 | 433 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 434 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 435 | /* copy over remaining packets */ |
a622ab72 JB |
436 | skb_queue_splice_tail_init(&tid_tx->pending, |
437 | &local->pending[queue]); | |
cd8ffc80 JB |
438 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
439 | } | |
440 | } | |
441 | ||
a6a67db2 JB |
442 | static void __releases(agg_queue) |
443 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 444 | { |
a6a67db2 | 445 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
446 | } |
447 | ||
448 | /* caller must hold sta->lock */ | |
b1720231 JB |
449 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
450 | struct sta_info *sta, u16 tid) | |
451 | { | |
a622ab72 JB |
452 | lockdep_assert_held(&sta->lock); |
453 | ||
b1720231 | 454 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 455 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
456 | #endif |
457 | ||
a622ab72 | 458 | ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid); |
cd8ffc80 | 459 | /* |
a622ab72 JB |
460 | * Now mark as operational. This will be visible |
461 | * in the TX path, and lets it go lock-free in | |
462 | * the common case. | |
cd8ffc80 | 463 | */ |
a622ab72 JB |
464 | set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state); |
465 | ieee80211_agg_splice_finish(local, tid); | |
b1720231 | 466 | |
12375ef9 | 467 | drv_ampdu_action(local, sta->sdata, |
c951ad35 | 468 | IEEE80211_AMPDU_TX_OPERATIONAL, |
24487981 | 469 | &sta->sta, tid, NULL); |
b1720231 JB |
470 | } |
471 | ||
c951ad35 | 472 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 473 | { |
c951ad35 JB |
474 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
475 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 476 | struct sta_info *sta; |
a622ab72 | 477 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 478 | |
b5878a2d JB |
479 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
480 | ||
b8695a8f JB |
481 | if (tid >= STA_TID_NUM) { |
482 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
483 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
484 | tid, STA_TID_NUM); | |
485 | #endif | |
486 | return; | |
487 | } | |
488 | ||
489 | rcu_read_lock(); | |
abe60632 | 490 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
491 | if (!sta) { |
492 | rcu_read_unlock(); | |
493 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
494 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
495 | #endif | |
496 | return; | |
497 | } | |
498 | ||
b8695a8f | 499 | spin_lock_bh(&sta->lock); |
a622ab72 | 500 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 501 | |
a622ab72 | 502 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 503 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 504 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f JB |
505 | #endif |
506 | spin_unlock_bh(&sta->lock); | |
507 | rcu_read_unlock(); | |
508 | return; | |
509 | } | |
510 | ||
a622ab72 | 511 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
96f5e66e | 512 | goto out; |
b8695a8f | 513 | |
a622ab72 | 514 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 515 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e JB |
516 | |
517 | out: | |
b8695a8f JB |
518 | spin_unlock_bh(&sta->lock); |
519 | rcu_read_unlock(); | |
520 | } | |
b8695a8f | 521 | |
c951ad35 | 522 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
523 | const u8 *ra, u16 tid) |
524 | { | |
c951ad35 JB |
525 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
526 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
527 | struct ieee80211_ra_tid *ra_tid; |
528 | struct sk_buff *skb = dev_alloc_skb(0); | |
529 | ||
530 | if (unlikely(!skb)) { | |
531 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
532 | if (net_ratelimit()) | |
533 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 534 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
535 | #endif |
536 | return; | |
537 | } | |
538 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
539 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
540 | ra_tid->tid = tid; | |
541 | ||
c1475ca9 JB |
542 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
543 | skb_queue_tail(&sdata->skb_queue, skb); | |
544 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
545 | } |
546 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
547 | ||
849b7967 JB |
548 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
549 | enum ieee80211_back_parties initiator) | |
550 | { | |
a622ab72 | 551 | struct tid_ampdu_tx *tid_tx; |
849b7967 JB |
552 | int ret; |
553 | ||
849b7967 | 554 | spin_lock_bh(&sta->lock); |
a622ab72 | 555 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
849b7967 | 556 | |
0ab33703 | 557 | if (!tid_tx) { |
849b7967 JB |
558 | ret = -ENOENT; |
559 | goto unlock; | |
560 | } | |
561 | ||
849b7967 JB |
562 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
563 | ||
564 | unlock: | |
565 | spin_unlock_bh(&sta->lock); | |
566 | return ret; | |
567 | } | |
b8695a8f | 568 | |
6a8579d0 | 569 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 570 | { |
c951ad35 JB |
571 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
572 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
573 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
574 | struct tid_ampdu_tx *tid_tx; |
575 | int ret = 0; | |
b8695a8f | 576 | |
6a8579d0 | 577 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 578 | |
4253119a | 579 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
580 | return -EINVAL; |
581 | ||
b8695a8f JB |
582 | if (tid >= STA_TID_NUM) |
583 | return -EINVAL; | |
584 | ||
0ab33703 JB |
585 | spin_lock_bh(&sta->lock); |
586 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
587 | ||
588 | if (!tid_tx) { | |
589 | ret = -ENOENT; | |
590 | goto unlock; | |
591 | } | |
592 | ||
593 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
594 | /* already in progress stopping it */ | |
595 | ret = 0; | |
596 | goto unlock; | |
597 | } | |
598 | ||
599 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
600 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
601 | ||
602 | unlock: | |
603 | spin_unlock_bh(&sta->lock); | |
604 | return ret; | |
b8695a8f JB |
605 | } |
606 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
607 | ||
c951ad35 | 608 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 609 | { |
c951ad35 JB |
610 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
611 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 612 | struct sta_info *sta; |
a622ab72 | 613 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 614 | |
b5878a2d JB |
615 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
616 | ||
b8695a8f JB |
617 | if (tid >= STA_TID_NUM) { |
618 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
619 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
620 | tid, STA_TID_NUM); | |
621 | #endif | |
622 | return; | |
623 | } | |
624 | ||
625 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
626 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
627 | ra, tid); | |
628 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
629 | ||
630 | rcu_read_lock(); | |
abe60632 | 631 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
632 | if (!sta) { |
633 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
634 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
635 | #endif | |
636 | rcu_read_unlock(); | |
637 | return; | |
638 | } | |
b8695a8f | 639 | |
a622ab72 JB |
640 | spin_lock_bh(&sta->lock); |
641 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
642 | ||
643 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
644 | #ifdef CONFIG_MAC80211_HT_DEBUG |
645 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
646 | #endif | |
a622ab72 | 647 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
648 | rcu_read_unlock(); |
649 | return; | |
650 | } | |
651 | ||
a622ab72 | 652 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR) |
b8695a8f JB |
653 | ieee80211_send_delba(sta->sdata, ra, tid, |
654 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
655 | ||
a622ab72 JB |
656 | /* |
657 | * When we get here, the TX path will not be lockless any more wrt. | |
658 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
659 | * Thus it will block on getting the lock, if it occurs. So if we | |
660 | * stop the queue now, we will not get any more packets, and any | |
661 | * that might be being processed will wait for us here, thereby | |
662 | * guaranteeing that no packets go to the tid_tx pending queue any | |
663 | * more. | |
664 | */ | |
b8695a8f | 665 | |
a622ab72 | 666 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 667 | |
a622ab72 JB |
668 | /* future packets must not find the tid_tx struct any more */ |
669 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
cd8ffc80 | 670 | |
a622ab72 | 671 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 672 | |
a622ab72 | 673 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); |
b8695a8f | 674 | |
a622ab72 | 675 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
676 | rcu_read_unlock(); |
677 | } | |
b8695a8f | 678 | |
c951ad35 | 679 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
680 | const u8 *ra, u16 tid) |
681 | { | |
c951ad35 JB |
682 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
683 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
684 | struct ieee80211_ra_tid *ra_tid; |
685 | struct sk_buff *skb = dev_alloc_skb(0); | |
686 | ||
687 | if (unlikely(!skb)) { | |
688 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
689 | if (net_ratelimit()) | |
690 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 691 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
692 | #endif |
693 | return; | |
694 | } | |
695 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
696 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
697 | ra_tid->tid = tid; | |
698 | ||
c1475ca9 JB |
699 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
700 | skb_queue_tail(&sdata->skb_queue, skb); | |
701 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
702 | } |
703 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
704 | ||
86ab6c5a | 705 | |
b8695a8f JB |
706 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
707 | struct sta_info *sta, | |
708 | struct ieee80211_mgmt *mgmt, | |
709 | size_t len) | |
710 | { | |
a622ab72 | 711 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 712 | u16 capab, tid; |
b8695a8f JB |
713 | |
714 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
715 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
716 | ||
b8695a8f JB |
717 | spin_lock_bh(&sta->lock); |
718 | ||
a622ab72 JB |
719 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
720 | ||
721 | if (!tid_tx) | |
8ade0082 | 722 | goto out; |
b8695a8f | 723 | |
a622ab72 | 724 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
725 | #ifdef CONFIG_MAC80211_HT_DEBUG |
726 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 727 | #endif |
8ade0082 | 728 | goto out; |
b8695a8f JB |
729 | } |
730 | ||
a622ab72 | 731 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 732 | |
b8695a8f | 733 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 734 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 735 | #endif |
2171abc5 | 736 | |
b8695a8f JB |
737 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
738 | == WLAN_STATUS_SUCCESS) { | |
a622ab72 JB |
739 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
740 | &tid_tx->state)) { | |
741 | /* ignore duplicate response */ | |
742 | goto out; | |
743 | } | |
b8695a8f | 744 | |
a622ab72 | 745 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 746 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 747 | |
b1720231 | 748 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 749 | } else { |
849b7967 | 750 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 751 | } |
2171abc5 | 752 | |
2171abc5 | 753 | out: |
849b7967 | 754 | spin_unlock_bh(&sta->lock); |
b8695a8f | 755 | } |