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 | |
827d42c9 JB |
149 | #ifdef CONFIG_MAC80211_HT_DEBUG |
150 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
151 | sta->sta.addr, tid); | |
152 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
153 | ||
a622ab72 | 154 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 155 | |
a622ab72 JB |
156 | /* |
157 | * After this packets are no longer handed right through | |
158 | * to the driver but are put onto tid_tx->pending instead, | |
159 | * with locking to ensure proper access. | |
160 | */ | |
161 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 162 | |
a622ab72 | 163 | tid_tx->stop_initiator = initiator; |
23e6a7ea | 164 | |
12375ef9 | 165 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 166 | IEEE80211_AMPDU_TX_STOP, |
24487981 | 167 | &sta->sta, tid, NULL); |
23e6a7ea JB |
168 | |
169 | /* HW shall not deny going back to legacy */ | |
170 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
171 | /* |
172 | * We may have pending packets get stuck in this case... | |
173 | * Not bothering with a workaround for now. | |
174 | */ | |
23e6a7ea JB |
175 | } |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
b8695a8f JB |
180 | /* |
181 | * After sending add Block Ack request we activated a timer until | |
182 | * add Block Ack response will arrive from the recipient. | |
183 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
184 | */ | |
185 | static void sta_addba_resp_timer_expired(unsigned long data) | |
186 | { | |
187 | /* not an elegant detour, but there is no choice as the timer passes | |
188 | * only one argument, and both sta_info and TID are needed, so init | |
189 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
190 | * array gives the sta through container_of */ | |
191 | u16 tid = *(u8 *)data; | |
23e6a7ea | 192 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 193 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 194 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 195 | |
b8695a8f JB |
196 | /* check if the TID waits for addBA response */ |
197 | spin_lock_bh(&sta->lock); | |
a622ab72 JB |
198 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
199 | if (!tid_tx || | |
200 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
b8695a8f | 201 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
202 | #ifdef CONFIG_MAC80211_HT_DEBUG |
203 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 204 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 205 | tid); |
b8695a8f | 206 | #endif |
23e6a7ea | 207 | return; |
b8695a8f JB |
208 | } |
209 | ||
210 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
211 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
212 | #endif | |
213 | ||
849b7967 | 214 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 215 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
216 | } |
217 | ||
96f5e66e JB |
218 | static inline int ieee80211_ac_from_tid(int tid) |
219 | { | |
220 | return ieee802_1d_to_ac[tid & 7]; | |
221 | } | |
222 | ||
a6a67db2 JB |
223 | /* |
224 | * When multiple aggregation sessions on multiple stations | |
225 | * are being created/destroyed simultaneously, we need to | |
226 | * refcount the global queue stop caused by that in order | |
227 | * to not get into a situation where one of the aggregation | |
228 | * setup or teardown re-enables queues before the other is | |
229 | * ready to handle that. | |
230 | * | |
231 | * These two functions take care of this issue by keeping | |
232 | * a global "agg_queue_stop" refcount. | |
233 | */ | |
234 | static void __acquires(agg_queue) | |
235 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
236 | { | |
237 | int queue = ieee80211_ac_from_tid(tid); | |
238 | ||
239 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
240 | ieee80211_stop_queue_by_reason( | |
241 | &local->hw, queue, | |
242 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
243 | __acquire(agg_queue); | |
244 | } | |
245 | ||
246 | static void __releases(agg_queue) | |
247 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
248 | { | |
249 | int queue = ieee80211_ac_from_tid(tid); | |
250 | ||
251 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
252 | ieee80211_wake_queue_by_reason( | |
253 | &local->hw, queue, | |
254 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
255 | __release(agg_queue); | |
256 | } | |
257 | ||
c951ad35 | 258 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 259 | { |
c951ad35 JB |
260 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
261 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
262 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 263 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 264 | int ret = 0; |
96f5e66e | 265 | u16 start_seq_num; |
b8695a8f | 266 | |
b5878a2d JB |
267 | trace_api_start_tx_ba_session(pubsta, tid); |
268 | ||
23e6a7ea JB |
269 | if (WARN_ON(!local->ops->ampdu_action)) |
270 | return -EINVAL; | |
271 | ||
c951ad35 JB |
272 | if ((tid >= STA_TID_NUM) || |
273 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
b8695a8f JB |
274 | return -EINVAL; |
275 | ||
276 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
277 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 278 | pubsta->addr, tid); |
b8695a8f JB |
279 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
280 | ||
8abd3f9b JB |
281 | /* |
282 | * The aggregation code is not prepared to handle | |
283 | * anything but STA/AP due to the BSSID handling. | |
284 | * IBSS could work in the code but isn't supported | |
285 | * by drivers or the standard. | |
286 | */ | |
c951ad35 JB |
287 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
288 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
289 | sdata->vif.type != NL80211_IFTYPE_AP) | |
290 | return -EINVAL; | |
8abd3f9b | 291 | |
618f356b | 292 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 293 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 294 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
295 | "Denying BA session request\n"); |
296 | #endif | |
c951ad35 | 297 | return -EINVAL; |
722f069a S |
298 | } |
299 | ||
b8695a8f JB |
300 | spin_lock_bh(&sta->lock); |
301 | ||
302 | /* we have tried too many times, receiver does not want A-MPDU */ | |
303 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
304 | ret = -EBUSY; | |
305 | goto err_unlock_sta; | |
306 | } | |
307 | ||
a622ab72 | 308 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 309 | /* check if the TID is not in aggregation flow already */ |
a622ab72 | 310 | if (tid_tx) { |
b8695a8f JB |
311 | #ifdef CONFIG_MAC80211_HT_DEBUG |
312 | printk(KERN_DEBUG "BA request denied - session is not " | |
313 | "idle on tid %u\n", tid); | |
314 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
315 | ret = -EAGAIN; | |
316 | goto err_unlock_sta; | |
317 | } | |
318 | ||
cd8ffc80 JB |
319 | /* |
320 | * While we're asking the driver about the aggregation, | |
321 | * stop the AC queue so that we don't have to worry | |
322 | * about frames that came in while we were doing that, | |
323 | * which would require us to put them to the AC pending | |
324 | * afterwards which just makes the code more complex. | |
325 | */ | |
a6a67db2 | 326 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 327 | |
b8695a8f | 328 | /* prepare A-MPDU MLME for Tx aggregation */ |
a622ab72 JB |
329 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
330 | if (!tid_tx) { | |
b8695a8f JB |
331 | #ifdef CONFIG_MAC80211_HT_DEBUG |
332 | if (net_ratelimit()) | |
333 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
334 | tid); | |
335 | #endif | |
336 | ret = -ENOMEM; | |
e4e72fb4 | 337 | goto err_wake_queue; |
b8695a8f | 338 | } |
96f5e66e | 339 | |
a622ab72 | 340 | skb_queue_head_init(&tid_tx->pending); |
cd8ffc80 | 341 | |
b8695a8f | 342 | /* Tx timer */ |
a622ab72 JB |
343 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
344 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
345 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 346 | |
f3f66b69 | 347 | start_seq_num = sta->tid_seq[tid] >> 4; |
b8695a8f | 348 | |
12375ef9 | 349 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, |
c951ad35 | 350 | pubsta, tid, &start_seq_num); |
b8695a8f | 351 | if (ret) { |
b8695a8f JB |
352 | #ifdef CONFIG_MAC80211_HT_DEBUG |
353 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
354 | " tid %d\n", tid); | |
355 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
96f5e66e | 356 | goto err_free; |
b8695a8f JB |
357 | } |
358 | ||
a622ab72 JB |
359 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
360 | ||
cd8ffc80 | 361 | /* Driver vetoed or OKed, but we can take packets again now */ |
a6a67db2 | 362 | ieee80211_wake_queue_agg(local, tid); |
b8695a8f | 363 | |
a622ab72 JB |
364 | /* activate the timer for the recipient's addBA response */ |
365 | tid_tx->addba_resp_timer.expires = jiffies + ADDBA_RESP_INTERVAL; | |
366 | add_timer(&tid_tx->addba_resp_timer); | |
367 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
368 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
369 | #endif | |
370 | ||
51a0d38d | 371 | /* prepare tid data */ |
b8695a8f | 372 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 JB |
373 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
374 | tid_tx->ssn = start_seq_num; | |
375 | ||
376 | sta->ampdu_mlme.addba_req_num[tid]++; | |
b8695a8f | 377 | |
51a0d38d JB |
378 | spin_unlock_bh(&sta->lock); |
379 | ||
380 | /* send AddBA request */ | |
c951ad35 | 381 | ieee80211_send_addba_request(sdata, pubsta->addr, tid, |
a622ab72 | 382 | tid_tx->dialog_token, tid_tx->ssn, |
b8695a8f | 383 | 0x40, 5000); |
c951ad35 | 384 | return 0; |
b8695a8f | 385 | |
96f5e66e | 386 | err_free: |
a622ab72 | 387 | kfree(tid_tx); |
e4e72fb4 | 388 | err_wake_queue: |
a6a67db2 | 389 | ieee80211_wake_queue_agg(local, tid); |
96f5e66e | 390 | err_unlock_sta: |
b8695a8f | 391 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
392 | return ret; |
393 | } | |
394 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
395 | ||
cd8ffc80 JB |
396 | /* |
397 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 398 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 399 | */ |
a6a67db2 JB |
400 | static void __acquires(agg_queue) |
401 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
402 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 403 | { |
a6a67db2 | 404 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 405 | unsigned long flags; |
cd8ffc80 | 406 | |
a6a67db2 | 407 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 408 | |
a622ab72 JB |
409 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
410 | " from the pending queue\n", tid)) | |
416fbdff LR |
411 | return; |
412 | ||
a622ab72 | 413 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 414 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 415 | /* copy over remaining packets */ |
a622ab72 JB |
416 | skb_queue_splice_tail_init(&tid_tx->pending, |
417 | &local->pending[queue]); | |
cd8ffc80 JB |
418 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
419 | } | |
420 | } | |
421 | ||
a6a67db2 JB |
422 | static void __releases(agg_queue) |
423 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 424 | { |
a6a67db2 | 425 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
426 | } |
427 | ||
428 | /* caller must hold sta->lock */ | |
b1720231 JB |
429 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
430 | struct sta_info *sta, u16 tid) | |
431 | { | |
a622ab72 JB |
432 | lockdep_assert_held(&sta->lock); |
433 | ||
b1720231 | 434 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 435 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
436 | #endif |
437 | ||
a622ab72 | 438 | ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid); |
cd8ffc80 | 439 | /* |
a622ab72 JB |
440 | * Now mark as operational. This will be visible |
441 | * in the TX path, and lets it go lock-free in | |
442 | * the common case. | |
cd8ffc80 | 443 | */ |
a622ab72 JB |
444 | set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state); |
445 | ieee80211_agg_splice_finish(local, tid); | |
b1720231 | 446 | |
12375ef9 | 447 | drv_ampdu_action(local, sta->sdata, |
c951ad35 | 448 | IEEE80211_AMPDU_TX_OPERATIONAL, |
24487981 | 449 | &sta->sta, tid, NULL); |
b1720231 JB |
450 | } |
451 | ||
c951ad35 | 452 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 453 | { |
c951ad35 JB |
454 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
455 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 456 | struct sta_info *sta; |
a622ab72 | 457 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 458 | |
b5878a2d JB |
459 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
460 | ||
b8695a8f JB |
461 | if (tid >= STA_TID_NUM) { |
462 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
463 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
464 | tid, STA_TID_NUM); | |
465 | #endif | |
466 | return; | |
467 | } | |
468 | ||
469 | rcu_read_lock(); | |
abe60632 | 470 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
471 | if (!sta) { |
472 | rcu_read_unlock(); | |
473 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
474 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
475 | #endif | |
476 | return; | |
477 | } | |
478 | ||
b8695a8f | 479 | spin_lock_bh(&sta->lock); |
a622ab72 | 480 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
b8695a8f | 481 | |
a622ab72 | 482 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 483 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 484 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f JB |
485 | #endif |
486 | spin_unlock_bh(&sta->lock); | |
487 | rcu_read_unlock(); | |
488 | return; | |
489 | } | |
490 | ||
a622ab72 | 491 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
96f5e66e | 492 | goto out; |
b8695a8f | 493 | |
a622ab72 | 494 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 495 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e JB |
496 | |
497 | out: | |
b8695a8f JB |
498 | spin_unlock_bh(&sta->lock); |
499 | rcu_read_unlock(); | |
500 | } | |
b8695a8f | 501 | |
c951ad35 | 502 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
503 | const u8 *ra, u16 tid) |
504 | { | |
c951ad35 JB |
505 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
506 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
507 | struct ieee80211_ra_tid *ra_tid; |
508 | struct sk_buff *skb = dev_alloc_skb(0); | |
509 | ||
510 | if (unlikely(!skb)) { | |
511 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
512 | if (net_ratelimit()) | |
513 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 514 | "dropping start BA session", sdata->name); |
86ab6c5a JB |
515 | #endif |
516 | return; | |
517 | } | |
518 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
519 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
520 | ra_tid->tid = tid; | |
521 | ||
c1475ca9 JB |
522 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
523 | skb_queue_tail(&sdata->skb_queue, skb); | |
524 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
525 | } |
526 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
527 | ||
849b7967 JB |
528 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
529 | enum ieee80211_back_parties initiator) | |
530 | { | |
a622ab72 | 531 | struct tid_ampdu_tx *tid_tx; |
849b7967 JB |
532 | int ret; |
533 | ||
849b7967 | 534 | spin_lock_bh(&sta->lock); |
a622ab72 | 535 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
849b7967 | 536 | |
a622ab72 JB |
537 | /* check if the TID is in aggregation */ |
538 | if (!tid_tx || !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
849b7967 JB |
539 | ret = -ENOENT; |
540 | goto unlock; | |
541 | } | |
542 | ||
849b7967 JB |
543 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
544 | ||
545 | unlock: | |
546 | spin_unlock_bh(&sta->lock); | |
547 | return ret; | |
548 | } | |
b8695a8f | 549 | |
6a8579d0 | 550 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 551 | { |
c951ad35 JB |
552 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
553 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
554 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 555 | |
6a8579d0 | 556 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 557 | |
4253119a | 558 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
559 | return -EINVAL; |
560 | ||
b8695a8f JB |
561 | if (tid >= STA_TID_NUM) |
562 | return -EINVAL; | |
563 | ||
6a8579d0 | 564 | return __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f JB |
565 | } |
566 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
567 | ||
c951ad35 | 568 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 569 | { |
c951ad35 JB |
570 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
571 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 572 | struct sta_info *sta; |
a622ab72 | 573 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 574 | |
b5878a2d JB |
575 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
576 | ||
b8695a8f JB |
577 | if (tid >= STA_TID_NUM) { |
578 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
579 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
580 | tid, STA_TID_NUM); | |
581 | #endif | |
582 | return; | |
583 | } | |
584 | ||
585 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
586 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
587 | ra, tid); | |
588 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
589 | ||
590 | rcu_read_lock(); | |
abe60632 | 591 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
592 | if (!sta) { |
593 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
594 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
595 | #endif | |
596 | rcu_read_unlock(); | |
597 | return; | |
598 | } | |
b8695a8f | 599 | |
a622ab72 JB |
600 | spin_lock_bh(&sta->lock); |
601 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; | |
602 | ||
603 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
604 | #ifdef CONFIG_MAC80211_HT_DEBUG |
605 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
606 | #endif | |
a622ab72 | 607 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
608 | rcu_read_unlock(); |
609 | return; | |
610 | } | |
611 | ||
a622ab72 | 612 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR) |
b8695a8f JB |
613 | ieee80211_send_delba(sta->sdata, ra, tid, |
614 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
615 | ||
a622ab72 JB |
616 | /* |
617 | * When we get here, the TX path will not be lockless any more wrt. | |
618 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
619 | * Thus it will block on getting the lock, if it occurs. So if we | |
620 | * stop the queue now, we will not get any more packets, and any | |
621 | * that might be being processed will wait for us here, thereby | |
622 | * guaranteeing that no packets go to the tid_tx pending queue any | |
623 | * more. | |
624 | */ | |
b8695a8f | 625 | |
a622ab72 | 626 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 627 | |
a622ab72 JB |
628 | /* future packets must not find the tid_tx struct any more */ |
629 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); | |
cd8ffc80 | 630 | |
a622ab72 | 631 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 632 | |
a622ab72 | 633 | call_rcu(&tid_tx->rcu_head, kfree_tid_tx); |
b8695a8f | 634 | |
a622ab72 | 635 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
636 | rcu_read_unlock(); |
637 | } | |
b8695a8f | 638 | |
c951ad35 | 639 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
640 | const u8 *ra, u16 tid) |
641 | { | |
c951ad35 JB |
642 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
643 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
644 | struct ieee80211_ra_tid *ra_tid; |
645 | struct sk_buff *skb = dev_alloc_skb(0); | |
646 | ||
647 | if (unlikely(!skb)) { | |
648 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
649 | if (net_ratelimit()) | |
650 | printk(KERN_WARNING "%s: Not enough memory, " | |
47846c9b | 651 | "dropping stop BA session", sdata->name); |
b8695a8f JB |
652 | #endif |
653 | return; | |
654 | } | |
655 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
656 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
657 | ra_tid->tid = tid; | |
658 | ||
c1475ca9 JB |
659 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
660 | skb_queue_tail(&sdata->skb_queue, skb); | |
661 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
662 | } |
663 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
664 | ||
86ab6c5a | 665 | |
b8695a8f JB |
666 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
667 | struct sta_info *sta, | |
668 | struct ieee80211_mgmt *mgmt, | |
669 | size_t len) | |
670 | { | |
a622ab72 | 671 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 672 | u16 capab, tid; |
b8695a8f JB |
673 | |
674 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
675 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
676 | ||
b8695a8f JB |
677 | spin_lock_bh(&sta->lock); |
678 | ||
a622ab72 JB |
679 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
680 | ||
681 | if (!tid_tx) | |
8ade0082 | 682 | goto out; |
b8695a8f | 683 | |
a622ab72 | 684 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
685 | #ifdef CONFIG_MAC80211_HT_DEBUG |
686 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 687 | #endif |
8ade0082 | 688 | goto out; |
b8695a8f JB |
689 | } |
690 | ||
a622ab72 | 691 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 692 | |
b8695a8f | 693 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 694 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 695 | #endif |
2171abc5 | 696 | |
b8695a8f JB |
697 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
698 | == WLAN_STATUS_SUCCESS) { | |
a622ab72 JB |
699 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
700 | &tid_tx->state)) { | |
701 | /* ignore duplicate response */ | |
702 | goto out; | |
703 | } | |
b8695a8f | 704 | |
a622ab72 | 705 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 706 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 707 | |
b1720231 | 708 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 709 | } else { |
849b7967 | 710 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 711 | } |
2171abc5 | 712 | |
2171abc5 | 713 | out: |
849b7967 | 714 | spin_unlock_bh(&sta->lock); |
b8695a8f | 715 | } |