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> | |
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 | ||
136 | static int ___ieee80211_stop_tx_ba_session( | |
137 | struct sta_info *sta, u16 tid, | |
138 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 139 | { |
849b7967 | 140 | struct ieee80211_local *local = sta->local; |
a622ab72 | 141 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
23e6a7ea | 142 | int ret; |
a622ab72 JB |
143 | |
144 | lockdep_assert_held(&sta->lock); | |
145 | ||
146 | if (WARN_ON(!tid_tx)) | |
147 | return -ENOENT; | |
23e6a7ea | 148 | |
0ab33703 JB |
149 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
150 | /* not even started yet! */ | |
151 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
152 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); | |
153 | return 0; | |
154 | } | |
155 | ||
827d42c9 JB |
156 | #ifdef CONFIG_MAC80211_HT_DEBUG |
157 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
158 | sta->sta.addr, tid); | |
159 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
160 | ||
a622ab72 | 161 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 162 | |
a622ab72 JB |
163 | /* |
164 | * After this packets are no longer handed right through | |
165 | * to the driver but are put onto tid_tx->pending instead, | |
166 | * with locking to ensure proper access. | |
167 | */ | |
168 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 169 | |
a622ab72 | 170 | tid_tx->stop_initiator = initiator; |
23e6a7ea | 171 | |
12375ef9 | 172 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 173 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 174 | &sta->sta, tid, NULL); |
23e6a7ea JB |
175 | |
176 | /* HW shall not deny going back to legacy */ | |
177 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
178 | /* |
179 | * We may have pending packets get stuck in this case... | |
180 | * Not bothering with a workaround for now. | |
181 | */ | |
23e6a7ea JB |
182 | } |
183 | ||
184 | return ret; | |
185 | } | |
186 | ||
b8695a8f JB |
187 | /* |
188 | * After sending add Block Ack request we activated a timer until | |
189 | * add Block Ack response will arrive from the recipient. | |
190 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
191 | */ | |
192 | static void sta_addba_resp_timer_expired(unsigned long data) | |
193 | { | |
194 | /* not an elegant detour, but there is no choice as the timer passes | |
195 | * only one argument, and both sta_info and TID are needed, so init | |
196 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
197 | * array gives the sta through container_of */ | |
198 | u16 tid = *(u8 *)data; | |
23e6a7ea | 199 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 200 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 201 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 202 | |
b8695a8f JB |
203 | /* check if the TID waits for addBA response */ |
204 | spin_lock_bh(&sta->lock); | |
a622ab72 JB |
205 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
206 | if (!tid_tx || | |
207 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
b8695a8f | 208 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
209 | #ifdef CONFIG_MAC80211_HT_DEBUG |
210 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 211 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 212 | tid); |
b8695a8f | 213 | #endif |
23e6a7ea | 214 | return; |
b8695a8f JB |
215 | } |
216 | ||
217 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
218 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
219 | #endif | |
220 | ||
849b7967 | 221 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 222 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
223 | } |
224 | ||
96f5e66e JB |
225 | static inline int ieee80211_ac_from_tid(int tid) |
226 | { | |
227 | return ieee802_1d_to_ac[tid & 7]; | |
228 | } | |
229 | ||
a6a67db2 JB |
230 | /* |
231 | * When multiple aggregation sessions on multiple stations | |
232 | * are being created/destroyed simultaneously, we need to | |
233 | * refcount the global queue stop caused by that in order | |
234 | * to not get into a situation where one of the aggregation | |
235 | * setup or teardown re-enables queues before the other is | |
236 | * ready to handle that. | |
237 | * | |
238 | * These two functions take care of this issue by keeping | |
239 | * a global "agg_queue_stop" refcount. | |
240 | */ | |
241 | static void __acquires(agg_queue) | |
242 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
243 | { | |
244 | int queue = ieee80211_ac_from_tid(tid); | |
245 | ||
246 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
247 | ieee80211_stop_queue_by_reason( | |
248 | &local->hw, queue, | |
249 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
250 | __acquire(agg_queue); | |
251 | } | |
252 | ||
253 | static void __releases(agg_queue) | |
254 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
255 | { | |
256 | int queue = ieee80211_ac_from_tid(tid); | |
257 | ||
258 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
259 | ieee80211_wake_queue_by_reason( | |
260 | &local->hw, queue, | |
261 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
262 | __release(agg_queue); | |
263 | } | |
264 | ||
0ab33703 JB |
265 | static void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
266 | { | |
267 | struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
268 | struct ieee80211_local *local = sta->local; | |
269 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
270 | u16 start_seq_num; | |
271 | int ret; | |
272 | ||
273 | /* | |
274 | * While we're asking the driver about the aggregation, | |
275 | * stop the AC queue so that we don't have to worry | |
276 | * about frames that came in while we were doing that, | |
277 | * which would require us to put them to the AC pending | |
278 | * afterwards which just makes the code more complex. | |
279 | */ | |
280 | ieee80211_stop_queue_agg(local, tid); | |
281 | ||
282 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
283 | ||
284 | /* | |
285 | * This might be off by one due to a race that we can't | |
286 | * really prevent here without synchronize_net() which | |
287 | * can't be called now. | |
288 | */ | |
289 | start_seq_num = sta->tid_seq[tid] >> 4; | |
290 | ||
291 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
292 | &sta->sta, tid, &start_seq_num); | |
293 | if (ret) { | |
294 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
295 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
296 | " tid %d\n", tid); | |
297 | #endif | |
298 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
299 | ieee80211_wake_queue_agg(local, tid); | |
300 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); | |
301 | return; | |
302 | } | |
303 | ||
304 | /* we can take packets again now */ | |
305 | ieee80211_wake_queue_agg(local, tid); | |
306 | ||
307 | /* activate the timer for the recipient's addBA response */ | |
308 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
309 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
310 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
311 | #endif | |
312 | ||
313 | sta->ampdu_mlme.addba_req_num[tid]++; | |
314 | ||
315 | /* send AddBA request */ | |
316 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
317 | tid_tx->dialog_token, start_seq_num, | |
318 | 0x40, 5000); | |
319 | } | |
320 | ||
321 | void ieee80211_tx_ba_session_work(struct work_struct *work) | |
322 | { | |
323 | struct sta_info *sta = | |
324 | container_of(work, struct sta_info, ampdu_mlme.work); | |
325 | struct tid_ampdu_tx *tid_tx; | |
326 | int tid; | |
327 | ||
328 | /* | |
329 | * When this flag is set, new sessions should be | |
330 | * blocked, and existing sessions will be torn | |
331 | * down by the code that set the flag, so this | |
332 | * need not run. | |
333 | */ | |
334 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) | |
335 | return; | |
336 | ||
337 | spin_lock_bh(&sta->lock); | |
338 | for (tid = 0; tid < STA_TID_NUM; tid++) { | |
339 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
340 | if (!tid_tx) | |
341 | continue; | |
342 | ||
343 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) | |
344 | ieee80211_tx_ba_session_handle_start(sta, tid); | |
345 | else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, | |
346 | &tid_tx->state)) | |
347 | ___ieee80211_stop_tx_ba_session(sta, tid, | |
348 | WLAN_BACK_INITIATOR); | |
349 | } | |
350 | spin_unlock_bh(&sta->lock); | |
351 | } | |
352 | ||
c951ad35 | 353 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 354 | { |
c951ad35 JB |
355 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
356 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
357 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 358 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 359 | int ret = 0; |
b8695a8f | 360 | |
b5878a2d JB |
361 | trace_api_start_tx_ba_session(pubsta, tid); |
362 | ||
23e6a7ea JB |
363 | if (WARN_ON(!local->ops->ampdu_action)) |
364 | return -EINVAL; | |
365 | ||
c951ad35 JB |
366 | if ((tid >= STA_TID_NUM) || |
367 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
368 | return -EINVAL; |
369 | ||
370 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
371 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 372 | pubsta->addr, tid); |
b8695a8f JB |
373 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
374 | ||
8abd3f9b JB |
375 | /* |
376 | * The aggregation code is not prepared to handle | |
377 | * anything but STA/AP due to the BSSID handling. | |
378 | * IBSS could work in the code but isn't supported | |
379 | * by drivers or the standard. | |
380 | */ | |
c951ad35 JB |
381 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
382 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
383 | sdata->vif.type != NL80211_IFTYPE_AP) | |
384 | return -EINVAL; | |
8abd3f9b | 385 | |
618f356b | 386 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 387 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 388 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
389 | "Denying BA session request\n"); |
390 | #endif | |
c951ad35 | 391 | return -EINVAL; |
722f069a S |
392 | } |
393 | ||
b8695a8f JB |
394 | spin_lock_bh(&sta->lock); |
395 | ||
396 | /* we have tried too many times, receiver does not want A-MPDU */ | |
397 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
398 | ret = -EBUSY; | |
399 | goto err_unlock_sta; | |
400 | } | |
401 | ||
a622ab72 | 402 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 403 | /* check if the TID is not in aggregation flow already */ |
a622ab72 | 404 | if (tid_tx) { |
b8695a8f JB |
405 | #ifdef CONFIG_MAC80211_HT_DEBUG |
406 | printk(KERN_DEBUG "BA request denied - session is not " | |
407 | "idle on tid %u\n", tid); | |
408 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
409 | ret = -EAGAIN; | |
410 | goto err_unlock_sta; | |
411 | } | |
412 | ||
413 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
414 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
415 | if (!tid_tx) { | |
b8695a8f JB |
416 | #ifdef CONFIG_MAC80211_HT_DEBUG |
417 | if (net_ratelimit()) | |
418 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
419 | tid); | |
420 | #endif | |
421 | ret = -ENOMEM; | |
0ab33703 | 422 | goto err_unlock_sta; |
b8695a8f | 423 | } |
96f5e66e | 424 | |
a622ab72 | 425 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 426 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 427 | |
b8695a8f | 428 | /* Tx timer */ |
a622ab72 JB |
429 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
430 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
431 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 432 | |
0ab33703 | 433 | /* assign a dialog token */ |
b8695a8f | 434 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 435 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 436 | |
0ab33703 JB |
437 | /* finally, assign it to the array */ |
438 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
51a0d38d | 439 | |
0ab33703 | 440 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 441 | |
0ab33703 | 442 | /* this flow continues off the work */ |
96f5e66e | 443 | err_unlock_sta: |
b8695a8f | 444 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
445 | return ret; |
446 | } | |
447 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
448 | ||
cd8ffc80 JB |
449 | /* |
450 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 451 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 452 | */ |
a6a67db2 JB |
453 | static void __acquires(agg_queue) |
454 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
455 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 456 | { |
a6a67db2 | 457 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 458 | unsigned long flags; |
cd8ffc80 | 459 | |
a6a67db2 | 460 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 461 | |
a622ab72 JB |
462 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
463 | " from the pending queue\n", tid)) | |
416fbdff LR |
464 | return; |
465 | ||
a622ab72 | 466 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 467 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 468 | /* copy over remaining packets */ |
a622ab72 JB |
469 | skb_queue_splice_tail_init(&tid_tx->pending, |
470 | &local->pending[queue]); | |
cd8ffc80 JB |
471 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
472 | } | |
473 | } | |
474 | ||
a6a67db2 JB |
475 | static void __releases(agg_queue) |
476 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 477 | { |
a6a67db2 | 478 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
479 | } |
480 | ||
481 | /* caller must hold sta->lock */ | |
b1720231 JB |
482 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
483 | struct sta_info *sta, u16 tid) | |
484 | { | |
a622ab72 JB |
485 | lockdep_assert_held(&sta->lock); |
486 | ||
b1720231 | 487 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 488 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
489 | #endif |
490 | ||
a622ab72 | 491 | ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid); |
cd8ffc80 | 492 | /* |
a622ab72 JB |
493 | * Now mark as operational. This will be visible |
494 | * in the TX path, and lets it go lock-free in | |
495 | * the common case. | |
cd8ffc80 | 496 | */ |
a622ab72 JB |
497 | set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state); |
498 | ieee80211_agg_splice_finish(local, tid); | |
b1720231 | 499 | |
12375ef9 | 500 | drv_ampdu_action(local, sta->sdata, |
c951ad35 | 501 | IEEE80211_AMPDU_TX_OPERATIONAL, |
24487981 | 502 | &sta->sta, tid, NULL); |
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 | ||
522 | rcu_read_lock(); | |
abe60632 | 523 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
524 | if (!sta) { |
525 | rcu_read_unlock(); | |
526 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
527 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
528 | #endif | |
529 | return; | |
530 | } | |
531 | ||
b8695a8f | 532 | spin_lock_bh(&sta->lock); |
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 JB |
538 | #endif |
539 | spin_unlock_bh(&sta->lock); | |
540 | rcu_read_unlock(); | |
541 | return; | |
542 | } | |
543 | ||
a622ab72 | 544 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
96f5e66e | 545 | goto out; |
b8695a8f | 546 | |
a622ab72 | 547 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 548 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e JB |
549 | |
550 | out: | |
b8695a8f JB |
551 | spin_unlock_bh(&sta->lock); |
552 | rcu_read_unlock(); | |
553 | } | |
b8695a8f | 554 | |
c951ad35 | 555 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
556 | const u8 *ra, u16 tid) |
557 | { | |
c951ad35 JB |
558 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
559 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
560 | struct ieee80211_ra_tid *ra_tid; |
561 | struct sk_buff *skb = dev_alloc_skb(0); | |
562 | ||
563 | if (unlikely(!skb)) { | |
564 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
565 | if (net_ratelimit()) | |
566 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 567 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
568 | #endif |
569 | return; | |
570 | } | |
571 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
572 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
573 | ra_tid->tid = tid; | |
574 | ||
c1475ca9 JB |
575 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
576 | skb_queue_tail(&sdata->skb_queue, skb); | |
577 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
578 | } |
579 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
580 | ||
849b7967 JB |
581 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
582 | enum ieee80211_back_parties initiator) | |
583 | { | |
a622ab72 | 584 | struct tid_ampdu_tx *tid_tx; |
849b7967 JB |
585 | int ret; |
586 | ||
849b7967 | 587 | spin_lock_bh(&sta->lock); |
a622ab72 | 588 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
849b7967 | 589 | |
0ab33703 | 590 | if (!tid_tx) { |
849b7967 JB |
591 | ret = -ENOENT; |
592 | goto unlock; | |
593 | } | |
594 | ||
849b7967 JB |
595 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
596 | ||
597 | unlock: | |
598 | spin_unlock_bh(&sta->lock); | |
599 | return ret; | |
600 | } | |
b8695a8f | 601 | |
6a8579d0 | 602 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 603 | { |
c951ad35 JB |
604 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
605 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
606 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
607 | struct tid_ampdu_tx *tid_tx; |
608 | int ret = 0; | |
b8695a8f | 609 | |
6a8579d0 | 610 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 611 | |
4253119a | 612 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
613 | return -EINVAL; |
614 | ||
b8695a8f JB |
615 | if (tid >= STA_TID_NUM) |
616 | return -EINVAL; | |
617 | ||
0ab33703 JB |
618 | spin_lock_bh(&sta->lock); |
619 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
620 | ||
621 | if (!tid_tx) { | |
622 | ret = -ENOENT; | |
623 | goto unlock; | |
624 | } | |
625 | ||
626 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
627 | /* already in progress stopping it */ | |
628 | ret = 0; | |
629 | goto unlock; | |
630 | } | |
631 | ||
632 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
633 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
634 | ||
635 | unlock: | |
636 | spin_unlock_bh(&sta->lock); | |
637 | return ret; | |
b8695a8f JB |
638 | } |
639 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
640 | ||
c951ad35 | 641 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 642 | { |
c951ad35 JB |
643 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
644 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 645 | struct sta_info *sta; |
a622ab72 | 646 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 647 | |
b5878a2d JB |
648 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
649 | ||
b8695a8f JB |
650 | if (tid >= STA_TID_NUM) { |
651 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
652 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
653 | tid, STA_TID_NUM); | |
654 | #endif | |
655 | return; | |
656 | } | |
657 | ||
658 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
659 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
660 | ra, tid); | |
661 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
662 | ||
663 | rcu_read_lock(); | |
abe60632 | 664 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
665 | if (!sta) { |
666 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
667 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
668 | #endif | |
669 | rcu_read_unlock(); | |
670 | return; | |
671 | } | |
b8695a8f | 672 | |
a622ab72 JB |
673 | spin_lock_bh(&sta->lock); |
674 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
675 | ||
676 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
677 | #ifdef CONFIG_MAC80211_HT_DEBUG |
678 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
679 | #endif | |
a622ab72 | 680 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
681 | rcu_read_unlock(); |
682 | return; | |
683 | } | |
684 | ||
a622ab72 | 685 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR) |
b8695a8f JB |
686 | ieee80211_send_delba(sta->sdata, ra, tid, |
687 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
688 | ||
a622ab72 JB |
689 | /* |
690 | * When we get here, the TX path will not be lockless any more wrt. | |
691 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
692 | * Thus it will block on getting the lock, if it occurs. So if we | |
693 | * stop the queue now, we will not get any more packets, and any | |
694 | * that might be being processed will wait for us here, thereby | |
695 | * guaranteeing that no packets go to the tid_tx pending queue any | |
696 | * more. | |
697 | */ | |
b8695a8f | 698 | |
a622ab72 | 699 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 700 | |
a622ab72 JB |
701 | /* future packets must not find the tid_tx struct any more */ |
702 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
cd8ffc80 | 703 | |
a622ab72 | 704 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 705 | |
a622ab72 | 706 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); |
b8695a8f | 707 | |
a622ab72 | 708 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
709 | rcu_read_unlock(); |
710 | } | |
b8695a8f | 711 | |
c951ad35 | 712 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
713 | const u8 *ra, u16 tid) |
714 | { | |
c951ad35 JB |
715 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
716 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
717 | struct ieee80211_ra_tid *ra_tid; |
718 | struct sk_buff *skb = dev_alloc_skb(0); | |
719 | ||
720 | if (unlikely(!skb)) { | |
721 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
722 | if (net_ratelimit()) | |
723 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 724 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
725 | #endif |
726 | return; | |
727 | } | |
728 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
729 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
730 | ra_tid->tid = tid; | |
731 | ||
c1475ca9 JB |
732 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
733 | skb_queue_tail(&sdata->skb_queue, skb); | |
734 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
735 | } |
736 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
737 | ||
86ab6c5a | 738 | |
b8695a8f JB |
739 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
740 | struct sta_info *sta, | |
741 | struct ieee80211_mgmt *mgmt, | |
742 | size_t len) | |
743 | { | |
a622ab72 | 744 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 745 | u16 capab, tid; |
b8695a8f JB |
746 | |
747 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
748 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
749 | ||
b8695a8f JB |
750 | spin_lock_bh(&sta->lock); |
751 | ||
a622ab72 JB |
752 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
753 | ||
754 | if (!tid_tx) | |
8ade0082 | 755 | goto out; |
b8695a8f | 756 | |
a622ab72 | 757 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
758 | #ifdef CONFIG_MAC80211_HT_DEBUG |
759 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 760 | #endif |
8ade0082 | 761 | goto out; |
b8695a8f JB |
762 | } |
763 | ||
a622ab72 | 764 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 765 | |
b8695a8f | 766 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 767 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 768 | #endif |
2171abc5 | 769 | |
b8695a8f JB |
770 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
771 | == WLAN_STATUS_SUCCESS) { | |
a622ab72 JB |
772 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
773 | &tid_tx->state)) { | |
774 | /* ignore duplicate response */ | |
775 | goto out; | |
776 | } | |
b8695a8f | 777 | |
a622ab72 | 778 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 779 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 780 | |
b1720231 | 781 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 782 | } else { |
849b7967 | 783 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 784 | } |
2171abc5 | 785 | |
2171abc5 | 786 | out: |
849b7967 | 787 | spin_unlock_bh(&sta->lock); |
b8695a8f | 788 | } |