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Commit | Line | Data |
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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
b8695a8f JB |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
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 | 23 | /** |
73a72a81 | 24 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
25 | * |
26 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
27 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
28 | * packets with a flag indicating A-MPDU aggregation. The driver | |
29 | * or device is responsible for actually aggregating the frames, | |
30 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 31 | * |
73a72a81 JB |
32 | * When TX aggregation is started by some subsystem (usually the rate |
33 | * control algorithm would be appropriate) by calling the | |
34 | * ieee80211_start_tx_ba_session() function, the driver will be | |
35 | * notified via its @ampdu_action function, with the | |
36 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
37 | * |
38 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
39 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
40 | * start the aggregation session after the peer has also responded. | |
41 | * If the peer responds negatively, the session will be stopped | |
42 | * again right away. Note that it is possible for the aggregation | |
43 | * session to be stopped before the driver has indicated that it | |
44 | * is done setting it up, in which case it must not indicate the | |
45 | * setup completion. | |
86ab6c5a | 46 | * |
73a72a81 JB |
47 | * Also note that, since we also need to wait for a response from |
48 | * the peer, the driver is notified of the completion of the | |
49 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
50 | * @ampdu_action callback. | |
51 | * | |
52 | * Similarly, when the aggregation session is stopped by the peer | |
53 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
54 | * @ampdu_action function will be called with the action | |
55 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
56 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
86ab6c5a JB |
57 | */ |
58 | ||
b8695a8f JB |
59 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
60 | const u8 *da, u16 tid, | |
61 | u8 dialog_token, u16 start_seq_num, | |
62 | u16 agg_size, u16 timeout) | |
63 | { | |
64 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
65 | struct sk_buff *skb; |
66 | struct ieee80211_mgmt *mgmt; | |
67 | u16 capab; | |
68 | ||
69 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
70 | ||
71 | if (!skb) { | |
72 | printk(KERN_ERR "%s: failed to allocate buffer " | |
47846c9b | 73 | "for addba request frame\n", sdata->name); |
b8695a8f JB |
74 | return; |
75 | } | |
76 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
77 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
78 | memset(mgmt, 0, 24); | |
79 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 80 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
81 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
82 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
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 | ||
109 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
110 | { | |
111 | struct ieee80211_local *local = sdata->local; | |
112 | struct sk_buff *skb; | |
113 | struct ieee80211_bar *bar; | |
114 | u16 bar_control = 0; | |
115 | ||
116 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
117 | if (!skb) { | |
118 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
47846c9b | 119 | "bar frame\n", sdata->name); |
b8695a8f JB |
120 | return; |
121 | } | |
122 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
123 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
124 | memset(bar, 0, sizeof(*bar)); | |
125 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
126 | IEEE80211_STYPE_BACK_REQ); | |
127 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 128 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
129 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
130 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
131 | bar_control |= (u16)(tid << 12); | |
132 | bar->control = cpu_to_le16(bar_control); | |
133 | bar->start_seq_num = cpu_to_le16(ssn); | |
134 | ||
62ae67be JB |
135 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
136 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f JB |
137 | } |
138 | ||
a622ab72 JB |
139 | static void kfree_tid_tx(struct rcu_head *rcu_head) |
140 | { | |
141 | struct tid_ampdu_tx *tid_tx = | |
142 | container_of(rcu_head, struct tid_ampdu_tx, rcu_head); | |
143 | ||
144 | kfree(tid_tx); | |
145 | } | |
146 | ||
67c282c0 JB |
147 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
148 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 149 | { |
849b7967 | 150 | struct ieee80211_local *local = sta->local; |
a622ab72 | 151 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
23e6a7ea | 152 | int ret; |
a622ab72 | 153 | |
cfcdbde3 | 154 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 155 | |
cfcdbde3 | 156 | if (!tid_tx) |
a622ab72 | 157 | return -ENOENT; |
23e6a7ea | 158 | |
cfcdbde3 JB |
159 | spin_lock_bh(&sta->lock); |
160 | ||
0ab33703 JB |
161 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
162 | /* not even started yet! */ | |
163 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
cfcdbde3 | 164 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
165 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); |
166 | return 0; | |
167 | } | |
168 | ||
cfcdbde3 JB |
169 | spin_unlock_bh(&sta->lock); |
170 | ||
827d42c9 JB |
171 | #ifdef CONFIG_MAC80211_HT_DEBUG |
172 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
173 | sta->sta.addr, tid); | |
174 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
175 | ||
a622ab72 | 176 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 177 | |
44271488 JB |
178 | del_timer_sync(&tid_tx->addba_resp_timer); |
179 | ||
a622ab72 JB |
180 | /* |
181 | * After this packets are no longer handed right through | |
182 | * to the driver but are put onto tid_tx->pending instead, | |
183 | * with locking to ensure proper access. | |
184 | */ | |
185 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 186 | |
a622ab72 | 187 | tid_tx->stop_initiator = initiator; |
23e6a7ea | 188 | |
12375ef9 | 189 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 190 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 191 | &sta->sta, tid, NULL); |
23e6a7ea JB |
192 | |
193 | /* HW shall not deny going back to legacy */ | |
194 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
195 | /* |
196 | * We may have pending packets get stuck in this case... | |
197 | * Not bothering with a workaround for now. | |
198 | */ | |
23e6a7ea JB |
199 | } |
200 | ||
201 | return ret; | |
202 | } | |
203 | ||
b8695a8f JB |
204 | /* |
205 | * After sending add Block Ack request we activated a timer until | |
206 | * add Block Ack response will arrive from the recipient. | |
207 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
208 | */ | |
209 | static void sta_addba_resp_timer_expired(unsigned long data) | |
210 | { | |
211 | /* not an elegant detour, but there is no choice as the timer passes | |
212 | * only one argument, and both sta_info and TID are needed, so init | |
213 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
214 | * array gives the sta through container_of */ | |
215 | u16 tid = *(u8 *)data; | |
23e6a7ea | 216 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 217 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 218 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 219 | |
b8695a8f | 220 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
221 | rcu_read_lock(); |
222 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
223 | if (!tid_tx || |
224 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 225 | rcu_read_unlock(); |
b8695a8f JB |
226 | #ifdef CONFIG_MAC80211_HT_DEBUG |
227 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 228 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 229 | tid); |
b8695a8f | 230 | #endif |
23e6a7ea | 231 | return; |
b8695a8f JB |
232 | } |
233 | ||
234 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
235 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
236 | #endif | |
237 | ||
83a5cbf7 JB |
238 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
239 | rcu_read_unlock(); | |
b8695a8f JB |
240 | } |
241 | ||
96f5e66e JB |
242 | static inline int ieee80211_ac_from_tid(int tid) |
243 | { | |
244 | return ieee802_1d_to_ac[tid & 7]; | |
245 | } | |
246 | ||
a6a67db2 JB |
247 | /* |
248 | * When multiple aggregation sessions on multiple stations | |
249 | * are being created/destroyed simultaneously, we need to | |
250 | * refcount the global queue stop caused by that in order | |
251 | * to not get into a situation where one of the aggregation | |
252 | * setup or teardown re-enables queues before the other is | |
253 | * ready to handle that. | |
254 | * | |
255 | * These two functions take care of this issue by keeping | |
256 | * a global "agg_queue_stop" refcount. | |
257 | */ | |
258 | static void __acquires(agg_queue) | |
259 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
260 | { | |
261 | int queue = ieee80211_ac_from_tid(tid); | |
262 | ||
263 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
264 | ieee80211_stop_queue_by_reason( | |
265 | &local->hw, queue, | |
266 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
267 | __acquire(agg_queue); | |
268 | } | |
269 | ||
270 | static void __releases(agg_queue) | |
271 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
272 | { | |
273 | int queue = ieee80211_ac_from_tid(tid); | |
274 | ||
275 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
276 | ieee80211_wake_queue_by_reason( | |
277 | &local->hw, queue, | |
278 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
279 | __release(agg_queue); | |
280 | } | |
281 | ||
67c282c0 | 282 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 JB |
283 | { |
284 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
285 | struct ieee80211_local *local = sta->local; | |
286 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
287 | u16 start_seq_num; | |
288 | int ret; | |
289 | ||
cfcdbde3 JB |
290 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
291 | ||
0ab33703 JB |
292 | /* |
293 | * While we're asking the driver about the aggregation, | |
294 | * stop the AC queue so that we don't have to worry | |
295 | * about frames that came in while we were doing that, | |
296 | * which would require us to put them to the AC pending | |
297 | * afterwards which just makes the code more complex. | |
298 | */ | |
299 | ieee80211_stop_queue_agg(local, tid); | |
300 | ||
301 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
302 | ||
303 | /* | |
cfcdbde3 JB |
304 | * make sure no packets are being processed to get |
305 | * valid starting sequence number | |
0ab33703 | 306 | */ |
cfcdbde3 JB |
307 | synchronize_net(); |
308 | ||
0ab33703 JB |
309 | start_seq_num = sta->tid_seq[tid] >> 4; |
310 | ||
311 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
312 | &sta->sta, tid, &start_seq_num); | |
313 | if (ret) { | |
314 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
315 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
316 | " tid %d\n", tid); | |
317 | #endif | |
cfcdbde3 | 318 | spin_lock_bh(&sta->lock); |
0ab33703 | 319 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); |
cfcdbde3 JB |
320 | spin_unlock_bh(&sta->lock); |
321 | ||
0ab33703 JB |
322 | ieee80211_wake_queue_agg(local, tid); |
323 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); | |
324 | return; | |
325 | } | |
326 | ||
327 | /* we can take packets again now */ | |
328 | ieee80211_wake_queue_agg(local, tid); | |
329 | ||
330 | /* activate the timer for the recipient's addBA response */ | |
331 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
332 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
333 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
334 | #endif | |
335 | ||
cfcdbde3 | 336 | spin_lock_bh(&sta->lock); |
0ab33703 | 337 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 338 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
339 | |
340 | /* send AddBA request */ | |
341 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
342 | tid_tx->dialog_token, start_seq_num, | |
343 | 0x40, 5000); | |
344 | } | |
345 | ||
c951ad35 | 346 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 347 | { |
c951ad35 JB |
348 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
349 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
350 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 351 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 352 | int ret = 0; |
b8695a8f | 353 | |
b5878a2d JB |
354 | trace_api_start_tx_ba_session(pubsta, tid); |
355 | ||
23e6a7ea JB |
356 | if (WARN_ON(!local->ops->ampdu_action)) |
357 | return -EINVAL; | |
358 | ||
c951ad35 JB |
359 | if ((tid >= STA_TID_NUM) || |
360 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
361 | return -EINVAL; |
362 | ||
363 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
364 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 365 | pubsta->addr, tid); |
b8695a8f JB |
366 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
367 | ||
8abd3f9b JB |
368 | /* |
369 | * The aggregation code is not prepared to handle | |
370 | * anything but STA/AP due to the BSSID handling. | |
371 | * IBSS could work in the code but isn't supported | |
372 | * by drivers or the standard. | |
373 | */ | |
c951ad35 JB |
374 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
375 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
376 | sdata->vif.type != NL80211_IFTYPE_AP) | |
377 | return -EINVAL; | |
8abd3f9b | 378 | |
618f356b | 379 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 380 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 381 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
382 | "Denying BA session request\n"); |
383 | #endif | |
c951ad35 | 384 | return -EINVAL; |
722f069a S |
385 | } |
386 | ||
b8695a8f JB |
387 | spin_lock_bh(&sta->lock); |
388 | ||
389 | /* we have tried too many times, receiver does not want A-MPDU */ | |
390 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
391 | ret = -EBUSY; | |
392 | goto err_unlock_sta; | |
393 | } | |
394 | ||
a622ab72 | 395 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 396 | /* check if the TID is not in aggregation flow already */ |
a622ab72 | 397 | if (tid_tx) { |
b8695a8f JB |
398 | #ifdef CONFIG_MAC80211_HT_DEBUG |
399 | printk(KERN_DEBUG "BA request denied - session is not " | |
400 | "idle on tid %u\n", tid); | |
401 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
402 | ret = -EAGAIN; | |
403 | goto err_unlock_sta; | |
404 | } | |
405 | ||
406 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
407 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
408 | if (!tid_tx) { | |
b8695a8f JB |
409 | #ifdef CONFIG_MAC80211_HT_DEBUG |
410 | if (net_ratelimit()) | |
411 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
412 | tid); | |
413 | #endif | |
414 | ret = -ENOMEM; | |
0ab33703 | 415 | goto err_unlock_sta; |
b8695a8f | 416 | } |
96f5e66e | 417 | |
a622ab72 | 418 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 419 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 420 | |
b8695a8f | 421 | /* Tx timer */ |
a622ab72 JB |
422 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
423 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
424 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 425 | |
0ab33703 | 426 | /* assign a dialog token */ |
b8695a8f | 427 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 428 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 429 | |
0ab33703 JB |
430 | /* finally, assign it to the array */ |
431 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
51a0d38d | 432 | |
0ab33703 | 433 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 434 | |
0ab33703 | 435 | /* this flow continues off the work */ |
96f5e66e | 436 | err_unlock_sta: |
b8695a8f | 437 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
438 | return ret; |
439 | } | |
440 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
441 | ||
cd8ffc80 JB |
442 | /* |
443 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 444 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 445 | */ |
a6a67db2 JB |
446 | static void __acquires(agg_queue) |
447 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
448 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 449 | { |
a6a67db2 | 450 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 451 | unsigned long flags; |
cd8ffc80 | 452 | |
a6a67db2 | 453 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 454 | |
a622ab72 JB |
455 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
456 | " from the pending queue\n", tid)) | |
416fbdff LR |
457 | return; |
458 | ||
a622ab72 | 459 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 460 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 461 | /* copy over remaining packets */ |
a622ab72 JB |
462 | skb_queue_splice_tail_init(&tid_tx->pending, |
463 | &local->pending[queue]); | |
cd8ffc80 JB |
464 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
465 | } | |
466 | } | |
467 | ||
a6a67db2 JB |
468 | static void __releases(agg_queue) |
469 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 470 | { |
a6a67db2 | 471 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
472 | } |
473 | ||
b1720231 JB |
474 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
475 | struct sta_info *sta, u16 tid) | |
476 | { | |
cfcdbde3 | 477 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 478 | |
b1720231 | 479 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 480 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
481 | #endif |
482 | ||
cfcdbde3 JB |
483 | drv_ampdu_action(local, sta->sdata, |
484 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
485 | &sta->sta, tid, NULL); | |
486 | ||
487 | /* | |
488 | * synchronize with TX path, while splicing the TX path | |
489 | * should block so it won't put more packets onto pending. | |
490 | */ | |
491 | spin_lock_bh(&sta->lock); | |
492 | ||
a622ab72 | 493 | ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid); |
cd8ffc80 | 494 | /* |
a622ab72 JB |
495 | * Now mark as operational. This will be visible |
496 | * in the TX path, and lets it go lock-free in | |
497 | * the common case. | |
cd8ffc80 | 498 | */ |
a622ab72 JB |
499 | set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state); |
500 | ieee80211_agg_splice_finish(local, tid); | |
b1720231 | 501 | |
cfcdbde3 | 502 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
503 | } |
504 | ||
c951ad35 | 505 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 506 | { |
c951ad35 JB |
507 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
508 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 509 | struct sta_info *sta; |
a622ab72 | 510 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 511 | |
b5878a2d JB |
512 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
513 | ||
b8695a8f JB |
514 | if (tid >= STA_TID_NUM) { |
515 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
516 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
517 | tid, STA_TID_NUM); | |
518 | #endif | |
519 | return; | |
520 | } | |
521 | ||
cfcdbde3 | 522 | mutex_lock(&local->sta_mtx); |
abe60632 | 523 | sta = sta_info_get(sdata, ra); |
b8695a8f | 524 | if (!sta) { |
cfcdbde3 | 525 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
526 | #ifdef CONFIG_MAC80211_HT_DEBUG |
527 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
528 | #endif | |
529 | return; | |
530 | } | |
531 | ||
cfcdbde3 | 532 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 533 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 534 | |
a622ab72 | 535 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 536 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 537 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 538 | #endif |
cfcdbde3 | 539 | goto unlock; |
b8695a8f JB |
540 | } |
541 | ||
a622ab72 | 542 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 543 | goto unlock; |
b8695a8f | 544 | |
a622ab72 | 545 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 546 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 547 | |
cfcdbde3 JB |
548 | unlock: |
549 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
550 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 551 | } |
b8695a8f | 552 | |
c951ad35 | 553 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
554 | const u8 *ra, u16 tid) |
555 | { | |
c951ad35 JB |
556 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
557 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
558 | struct ieee80211_ra_tid *ra_tid; |
559 | struct sk_buff *skb = dev_alloc_skb(0); | |
560 | ||
561 | if (unlikely(!skb)) { | |
562 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
563 | if (net_ratelimit()) | |
564 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 565 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
566 | #endif |
567 | return; | |
568 | } | |
569 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
570 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
571 | ra_tid->tid = tid; | |
572 | ||
c1475ca9 JB |
573 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
574 | skb_queue_tail(&sdata->skb_queue, skb); | |
575 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
576 | } |
577 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
578 | ||
849b7967 JB |
579 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
580 | enum ieee80211_back_parties initiator) | |
581 | { | |
849b7967 JB |
582 | int ret; |
583 | ||
cfcdbde3 | 584 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 585 | |
849b7967 JB |
586 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
587 | ||
cfcdbde3 JB |
588 | mutex_unlock(&sta->ampdu_mlme.mtx); |
589 | ||
849b7967 JB |
590 | return ret; |
591 | } | |
b8695a8f | 592 | |
6a8579d0 | 593 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 594 | { |
c951ad35 JB |
595 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
596 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
597 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
598 | struct tid_ampdu_tx *tid_tx; |
599 | int ret = 0; | |
b8695a8f | 600 | |
6a8579d0 | 601 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 602 | |
4253119a | 603 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
604 | return -EINVAL; |
605 | ||
b8695a8f JB |
606 | if (tid >= STA_TID_NUM) |
607 | return -EINVAL; | |
608 | ||
0ab33703 JB |
609 | spin_lock_bh(&sta->lock); |
610 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
611 | ||
612 | if (!tid_tx) { | |
613 | ret = -ENOENT; | |
614 | goto unlock; | |
615 | } | |
616 | ||
617 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
618 | /* already in progress stopping it */ | |
619 | ret = 0; | |
620 | goto unlock; | |
621 | } | |
622 | ||
623 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
624 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
625 | ||
626 | unlock: | |
627 | spin_unlock_bh(&sta->lock); | |
628 | return ret; | |
b8695a8f JB |
629 | } |
630 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
631 | ||
c951ad35 | 632 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 633 | { |
c951ad35 JB |
634 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
635 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 636 | struct sta_info *sta; |
a622ab72 | 637 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 638 | |
b5878a2d JB |
639 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
640 | ||
b8695a8f JB |
641 | if (tid >= STA_TID_NUM) { |
642 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
643 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
644 | tid, STA_TID_NUM); | |
645 | #endif | |
646 | return; | |
647 | } | |
648 | ||
649 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
650 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
651 | ra, tid); | |
652 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
653 | ||
cfcdbde3 JB |
654 | mutex_lock(&local->sta_mtx); |
655 | ||
abe60632 | 656 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
657 | if (!sta) { |
658 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
659 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
660 | #endif | |
cfcdbde3 | 661 | goto unlock; |
b8695a8f | 662 | } |
b8695a8f | 663 | |
cfcdbde3 | 664 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 JB |
665 | spin_lock_bh(&sta->lock); |
666 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
667 | ||
668 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
669 | #ifdef CONFIG_MAC80211_HT_DEBUG |
670 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
671 | #endif | |
cfcdbde3 | 672 | goto unlock_sta; |
b8695a8f JB |
673 | } |
674 | ||
a622ab72 | 675 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR) |
b8695a8f JB |
676 | ieee80211_send_delba(sta->sdata, ra, tid, |
677 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
678 | ||
a622ab72 JB |
679 | /* |
680 | * When we get here, the TX path will not be lockless any more wrt. | |
681 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
682 | * Thus it will block on getting the lock, if it occurs. So if we | |
683 | * stop the queue now, we will not get any more packets, and any | |
684 | * that might be being processed will wait for us here, thereby | |
685 | * guaranteeing that no packets go to the tid_tx pending queue any | |
686 | * more. | |
687 | */ | |
b8695a8f | 688 | |
a622ab72 | 689 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 690 | |
a622ab72 JB |
691 | /* future packets must not find the tid_tx struct any more */ |
692 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
cd8ffc80 | 693 | |
a622ab72 | 694 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 695 | |
a622ab72 | 696 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); |
b8695a8f | 697 | |
cfcdbde3 | 698 | unlock_sta: |
a622ab72 | 699 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
700 | mutex_unlock(&sta->ampdu_mlme.mtx); |
701 | unlock: | |
702 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 703 | } |
b8695a8f | 704 | |
c951ad35 | 705 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
706 | const u8 *ra, u16 tid) |
707 | { | |
c951ad35 JB |
708 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
709 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
710 | struct ieee80211_ra_tid *ra_tid; |
711 | struct sk_buff *skb = dev_alloc_skb(0); | |
712 | ||
713 | if (unlikely(!skb)) { | |
714 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
715 | if (net_ratelimit()) | |
716 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 717 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
718 | #endif |
719 | return; | |
720 | } | |
721 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
722 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
723 | ra_tid->tid = tid; | |
724 | ||
c1475ca9 JB |
725 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
726 | skb_queue_tail(&sdata->skb_queue, skb); | |
727 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
728 | } |
729 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
730 | ||
86ab6c5a | 731 | |
b8695a8f JB |
732 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
733 | struct sta_info *sta, | |
734 | struct ieee80211_mgmt *mgmt, | |
735 | size_t len) | |
736 | { | |
a622ab72 | 737 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 738 | u16 capab, tid; |
b8695a8f JB |
739 | |
740 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
741 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
742 | ||
cfcdbde3 | 743 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 744 | |
a622ab72 | 745 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
a622ab72 | 746 | if (!tid_tx) |
8ade0082 | 747 | goto out; |
b8695a8f | 748 | |
a622ab72 | 749 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
750 | #ifdef CONFIG_MAC80211_HT_DEBUG |
751 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 752 | #endif |
8ade0082 | 753 | goto out; |
b8695a8f JB |
754 | } |
755 | ||
a622ab72 | 756 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 757 | |
b8695a8f | 758 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 759 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 760 | #endif |
2171abc5 | 761 | |
b8695a8f JB |
762 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
763 | == WLAN_STATUS_SUCCESS) { | |
a622ab72 JB |
764 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
765 | &tid_tx->state)) { | |
766 | /* ignore duplicate response */ | |
767 | goto out; | |
768 | } | |
b8695a8f | 769 | |
a622ab72 | 770 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 771 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 772 | |
b1720231 | 773 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 774 | } else { |
849b7967 | 775 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 776 | } |
2171abc5 | 777 | |
2171abc5 | 778 | out: |
cfcdbde3 | 779 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 780 | } |