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