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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2007-2009, Intel Corporation | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
17 | #include <net/mac80211.h> | |
18 | #include "ieee80211_i.h" | |
19 | #include "wme.h" | |
20 | ||
21 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, | |
22 | const u8 *da, u16 tid, | |
23 | u8 dialog_token, u16 start_seq_num, | |
24 | u16 agg_size, u16 timeout) | |
25 | { | |
26 | struct ieee80211_local *local = sdata->local; | |
27 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; | |
28 | struct sk_buff *skb; | |
29 | struct ieee80211_mgmt *mgmt; | |
30 | u16 capab; | |
31 | ||
32 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
33 | ||
34 | if (!skb) { | |
35 | printk(KERN_ERR "%s: failed to allocate buffer " | |
36 | "for addba request frame\n", sdata->dev->name); | |
37 | return; | |
38 | } | |
39 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
40 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
41 | memset(mgmt, 0, 24); | |
42 | memcpy(mgmt->da, da, ETH_ALEN); | |
43 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
44 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
45 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f JB |
46 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
47 | else | |
48 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); | |
49 | ||
50 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
51 | IEEE80211_STYPE_ACTION); | |
52 | ||
53 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
54 | ||
55 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
56 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
57 | ||
58 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
59 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
60 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
61 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
62 | ||
63 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
64 | ||
65 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
66 | mgmt->u.action.u.addba_req.start_seq_num = | |
67 | cpu_to_le16(start_seq_num << 4); | |
68 | ||
69 | ieee80211_tx_skb(sdata, skb, 1); | |
70 | } | |
71 | ||
72 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
73 | { | |
74 | struct ieee80211_local *local = sdata->local; | |
75 | struct sk_buff *skb; | |
76 | struct ieee80211_bar *bar; | |
77 | u16 bar_control = 0; | |
78 | ||
79 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
80 | if (!skb) { | |
81 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
82 | "bar frame\n", sdata->dev->name); | |
83 | return; | |
84 | } | |
85 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
86 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
87 | memset(bar, 0, sizeof(*bar)); | |
88 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
89 | IEEE80211_STYPE_BACK_REQ); | |
90 | memcpy(bar->ra, ra, ETH_ALEN); | |
91 | memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); | |
92 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; | |
93 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
94 | bar_control |= (u16)(tid << 12); | |
95 | bar->control = cpu_to_le16(bar_control); | |
96 | bar->start_seq_num = cpu_to_le16(ssn); | |
97 | ||
98 | ieee80211_tx_skb(sdata, skb, 0); | |
99 | } | |
100 | ||
101 | /* | |
102 | * After sending add Block Ack request we activated a timer until | |
103 | * add Block Ack response will arrive from the recipient. | |
104 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
105 | */ | |
106 | static void sta_addba_resp_timer_expired(unsigned long data) | |
107 | { | |
108 | /* not an elegant detour, but there is no choice as the timer passes | |
109 | * only one argument, and both sta_info and TID are needed, so init | |
110 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
111 | * array gives the sta through container_of */ | |
112 | u16 tid = *(u8 *)data; | |
113 | struct sta_info *temp_sta = container_of((void *)data, | |
114 | struct sta_info, timer_to_tid[tid]); | |
115 | ||
116 | struct ieee80211_local *local = temp_sta->local; | |
117 | struct ieee80211_hw *hw = &local->hw; | |
118 | struct sta_info *sta; | |
119 | u8 *state; | |
120 | ||
121 | rcu_read_lock(); | |
122 | ||
123 | sta = sta_info_get(local, temp_sta->sta.addr); | |
124 | if (!sta) { | |
125 | rcu_read_unlock(); | |
126 | return; | |
127 | } | |
128 | ||
129 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
130 | /* check if the TID waits for addBA response */ | |
131 | spin_lock_bh(&sta->lock); | |
132 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
133 | spin_unlock_bh(&sta->lock); | |
134 | *state = HT_AGG_STATE_IDLE; | |
135 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
136 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
137 | "expecting addBA response there", tid); | |
138 | #endif | |
139 | goto timer_expired_exit; | |
140 | } | |
141 | ||
142 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
143 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
144 | #endif | |
145 | ||
146 | /* go through the state check in stop_BA_session */ | |
147 | *state = HT_AGG_STATE_OPERATIONAL; | |
148 | spin_unlock_bh(&sta->lock); | |
149 | ieee80211_stop_tx_ba_session(hw, temp_sta->sta.addr, tid, | |
150 | WLAN_BACK_INITIATOR); | |
151 | ||
152 | timer_expired_exit: | |
153 | rcu_read_unlock(); | |
154 | } | |
155 | ||
156 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
157 | { | |
158 | struct ieee80211_local *local = hw_to_local(hw); | |
159 | struct sta_info *sta; | |
160 | struct ieee80211_sub_if_data *sdata; | |
161 | u16 start_seq_num; | |
162 | u8 *state; | |
163 | int ret = 0; | |
164 | ||
165 | if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
166 | return -EINVAL; | |
167 | ||
168 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
169 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
170 | ra, tid); | |
171 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
172 | ||
173 | rcu_read_lock(); | |
174 | ||
175 | sta = sta_info_get(local, ra); | |
176 | if (!sta) { | |
177 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
178 | printk(KERN_DEBUG "Could not find the station\n"); | |
179 | #endif | |
180 | ret = -ENOENT; | |
181 | goto exit; | |
182 | } | |
183 | ||
8abd3f9b JB |
184 | /* |
185 | * The aggregation code is not prepared to handle | |
186 | * anything but STA/AP due to the BSSID handling. | |
187 | * IBSS could work in the code but isn't supported | |
188 | * by drivers or the standard. | |
189 | */ | |
190 | if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && | |
191 | sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
192 | sta->sdata->vif.type != NL80211_IFTYPE_AP) { | |
193 | ret = -EINVAL; | |
194 | goto exit; | |
195 | } | |
196 | ||
b8695a8f JB |
197 | spin_lock_bh(&sta->lock); |
198 | ||
199 | /* we have tried too many times, receiver does not want A-MPDU */ | |
200 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
201 | ret = -EBUSY; | |
202 | goto err_unlock_sta; | |
203 | } | |
204 | ||
205 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
206 | /* check if the TID is not in aggregation flow already */ | |
207 | if (*state != HT_AGG_STATE_IDLE) { | |
208 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
209 | printk(KERN_DEBUG "BA request denied - session is not " | |
210 | "idle on tid %u\n", tid); | |
211 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
212 | ret = -EAGAIN; | |
213 | goto err_unlock_sta; | |
214 | } | |
215 | ||
216 | /* prepare A-MPDU MLME for Tx aggregation */ | |
217 | sta->ampdu_mlme.tid_tx[tid] = | |
218 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
219 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
220 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
221 | if (net_ratelimit()) | |
222 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
223 | tid); | |
224 | #endif | |
225 | ret = -ENOMEM; | |
226 | goto err_unlock_sta; | |
227 | } | |
228 | /* Tx timer */ | |
229 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
230 | sta_addba_resp_timer_expired; | |
231 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
232 | (unsigned long)&sta->timer_to_tid[tid]; | |
233 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
234 | ||
235 | if (hw->ampdu_queues) { | |
236 | /* create a new queue for this aggregation */ | |
237 | ret = ieee80211_ht_agg_queue_add(local, sta, tid); | |
238 | ||
239 | /* case no queue is available to aggregation | |
240 | * don't switch to aggregation */ | |
241 | if (ret) { | |
242 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
243 | printk(KERN_DEBUG "BA request denied - " | |
244 | "queue unavailable for tid %d\n", tid); | |
245 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
246 | goto err_unlock_queue; | |
247 | } | |
248 | } | |
249 | sdata = sta->sdata; | |
250 | ||
251 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the | |
252 | * call back right away, it must see that the flow has begun */ | |
253 | *state |= HT_ADDBA_REQUESTED_MSK; | |
254 | ||
255 | /* This is slightly racy because the queue isn't stopped */ | |
256 | start_seq_num = sta->tid_seq[tid]; | |
257 | ||
258 | if (local->ops->ampdu_action) | |
259 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, | |
260 | &sta->sta, tid, &start_seq_num); | |
261 | ||
262 | if (ret) { | |
263 | /* No need to requeue the packets in the agg queue, since we | |
264 | * held the tx lock: no packet could be enqueued to the newly | |
265 | * allocated queue */ | |
266 | if (hw->ampdu_queues) | |
267 | ieee80211_ht_agg_queue_remove(local, sta, tid, 0); | |
268 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
269 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
270 | " tid %d\n", tid); | |
271 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
272 | *state = HT_AGG_STATE_IDLE; | |
273 | goto err_unlock_queue; | |
274 | } | |
275 | ||
276 | /* Will put all the packets in the new SW queue */ | |
277 | if (hw->ampdu_queues) | |
278 | ieee80211_requeue(local, ieee802_1d_to_ac[tid]); | |
279 | spin_unlock_bh(&sta->lock); | |
280 | ||
281 | /* send an addBA request */ | |
282 | sta->ampdu_mlme.dialog_token_allocator++; | |
283 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
284 | sta->ampdu_mlme.dialog_token_allocator; | |
285 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
286 | ||
287 | ||
288 | ieee80211_send_addba_request(sta->sdata, ra, tid, | |
289 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, | |
290 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
291 | 0x40, 5000); | |
292 | /* activate the timer for the recipient's addBA response */ | |
293 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
294 | jiffies + ADDBA_RESP_INTERVAL; | |
295 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
296 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
297 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
298 | #endif | |
299 | goto exit; | |
300 | ||
301 | err_unlock_queue: | |
302 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
303 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
304 | ret = -EBUSY; | |
305 | err_unlock_sta: | |
306 | spin_unlock_bh(&sta->lock); | |
307 | exit: | |
308 | rcu_read_unlock(); | |
309 | return ret; | |
310 | } | |
311 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
312 | ||
313 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
314 | { | |
315 | struct ieee80211_local *local = hw_to_local(hw); | |
316 | struct sta_info *sta; | |
317 | u8 *state; | |
318 | ||
319 | if (tid >= STA_TID_NUM) { | |
320 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
321 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
322 | tid, STA_TID_NUM); | |
323 | #endif | |
324 | return; | |
325 | } | |
326 | ||
327 | rcu_read_lock(); | |
328 | sta = sta_info_get(local, ra); | |
329 | if (!sta) { | |
330 | rcu_read_unlock(); | |
331 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
332 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
333 | #endif | |
334 | return; | |
335 | } | |
336 | ||
337 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
338 | spin_lock_bh(&sta->lock); | |
339 | ||
340 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
341 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
342 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
343 | *state); | |
344 | #endif | |
345 | spin_unlock_bh(&sta->lock); | |
346 | rcu_read_unlock(); | |
347 | return; | |
348 | } | |
349 | ||
350 | WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); | |
351 | ||
352 | *state |= HT_ADDBA_DRV_READY_MSK; | |
353 | ||
354 | if (*state == HT_AGG_STATE_OPERATIONAL) { | |
355 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
356 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
357 | #endif | |
358 | if (hw->ampdu_queues) | |
359 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
360 | } | |
361 | spin_unlock_bh(&sta->lock); | |
362 | rcu_read_unlock(); | |
363 | } | |
364 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
365 | ||
366 | ||
367 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
368 | u8 *ra, u16 tid, | |
369 | enum ieee80211_back_parties initiator) | |
370 | { | |
371 | struct ieee80211_local *local = hw_to_local(hw); | |
372 | struct sta_info *sta; | |
373 | u8 *state; | |
374 | int ret = 0; | |
375 | ||
376 | if (tid >= STA_TID_NUM) | |
377 | return -EINVAL; | |
378 | ||
379 | rcu_read_lock(); | |
380 | sta = sta_info_get(local, ra); | |
381 | if (!sta) { | |
382 | rcu_read_unlock(); | |
383 | return -ENOENT; | |
384 | } | |
385 | ||
386 | /* check if the TID is in aggregation */ | |
387 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
388 | spin_lock_bh(&sta->lock); | |
389 | ||
390 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
391 | ret = -ENOENT; | |
392 | goto stop_BA_exit; | |
393 | } | |
394 | ||
395 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
396 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
397 | ra, tid); | |
398 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
399 | ||
400 | if (hw->ampdu_queues) | |
401 | ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); | |
402 | ||
403 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | | |
404 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
405 | ||
406 | if (local->ops->ampdu_action) | |
407 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, | |
408 | &sta->sta, tid, NULL); | |
409 | ||
955d3fe3 JB |
410 | /* HW shall not deny going back to legacy */ |
411 | if (WARN_ON(ret)) { | |
b8695a8f JB |
412 | *state = HT_AGG_STATE_OPERATIONAL; |
413 | if (hw->ampdu_queues) | |
414 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
415 | goto stop_BA_exit; | |
416 | } | |
417 | ||
418 | stop_BA_exit: | |
419 | spin_unlock_bh(&sta->lock); | |
420 | rcu_read_unlock(); | |
421 | return ret; | |
422 | } | |
423 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
424 | ||
425 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
426 | { | |
427 | struct ieee80211_local *local = hw_to_local(hw); | |
428 | struct sta_info *sta; | |
429 | u8 *state; | |
430 | int agg_queue; | |
431 | ||
432 | if (tid >= STA_TID_NUM) { | |
433 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
434 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
435 | tid, STA_TID_NUM); | |
436 | #endif | |
437 | return; | |
438 | } | |
439 | ||
440 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
441 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
442 | ra, tid); | |
443 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
444 | ||
445 | rcu_read_lock(); | |
446 | sta = sta_info_get(local, ra); | |
447 | if (!sta) { | |
448 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
449 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
450 | #endif | |
451 | rcu_read_unlock(); | |
452 | return; | |
453 | } | |
454 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
455 | ||
456 | /* NOTE: no need to use sta->lock in this state check, as | |
457 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
458 | * pass through per sta/tid | |
459 | */ | |
460 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
461 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
462 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
463 | #endif | |
464 | rcu_read_unlock(); | |
465 | return; | |
466 | } | |
467 | ||
468 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
469 | ieee80211_send_delba(sta->sdata, ra, tid, | |
470 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
471 | ||
472 | if (hw->ampdu_queues) { | |
473 | agg_queue = sta->tid_to_tx_q[tid]; | |
474 | ieee80211_ht_agg_queue_remove(local, sta, tid, 1); | |
475 | ||
476 | /* We just requeued the all the frames that were in the | |
477 | * removed queue, and since we might miss a softirq we do | |
478 | * netif_schedule_queue. ieee80211_wake_queue is not used | |
479 | * here as this queue is not necessarily stopped | |
480 | */ | |
481 | netif_schedule_queue(netdev_get_tx_queue(local->mdev, | |
482 | agg_queue)); | |
483 | } | |
484 | spin_lock_bh(&sta->lock); | |
485 | *state = HT_AGG_STATE_IDLE; | |
486 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
487 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
488 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
489 | spin_unlock_bh(&sta->lock); | |
490 | ||
491 | rcu_read_unlock(); | |
492 | } | |
493 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
494 | ||
495 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, | |
496 | const u8 *ra, u16 tid) | |
497 | { | |
498 | struct ieee80211_local *local = hw_to_local(hw); | |
499 | struct ieee80211_ra_tid *ra_tid; | |
500 | struct sk_buff *skb = dev_alloc_skb(0); | |
501 | ||
502 | if (unlikely(!skb)) { | |
503 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
504 | if (net_ratelimit()) | |
505 | printk(KERN_WARNING "%s: Not enough memory, " | |
506 | "dropping start BA session", skb->dev->name); | |
507 | #endif | |
508 | return; | |
509 | } | |
510 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
511 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
512 | ra_tid->tid = tid; | |
513 | ||
514 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
515 | skb_queue_tail(&local->skb_queue, skb); | |
516 | tasklet_schedule(&local->tasklet); | |
517 | } | |
518 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
519 | ||
520 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, | |
521 | const u8 *ra, u16 tid) | |
522 | { | |
523 | struct ieee80211_local *local = hw_to_local(hw); | |
524 | struct ieee80211_ra_tid *ra_tid; | |
525 | struct sk_buff *skb = dev_alloc_skb(0); | |
526 | ||
527 | if (unlikely(!skb)) { | |
528 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
529 | if (net_ratelimit()) | |
530 | printk(KERN_WARNING "%s: Not enough memory, " | |
531 | "dropping stop BA session", skb->dev->name); | |
532 | #endif | |
533 | return; | |
534 | } | |
535 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
536 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
537 | ra_tid->tid = tid; | |
538 | ||
539 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
540 | skb_queue_tail(&local->skb_queue, skb); | |
541 | tasklet_schedule(&local->tasklet); | |
542 | } | |
543 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
544 | ||
545 | void ieee80211_process_addba_resp(struct ieee80211_local *local, | |
546 | struct sta_info *sta, | |
547 | struct ieee80211_mgmt *mgmt, | |
548 | size_t len) | |
549 | { | |
550 | struct ieee80211_hw *hw = &local->hw; | |
551 | u16 capab; | |
552 | u16 tid, start_seq_num; | |
553 | u8 *state; | |
554 | ||
555 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
556 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
557 | ||
558 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
559 | ||
560 | spin_lock_bh(&sta->lock); | |
561 | ||
562 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
563 | spin_unlock_bh(&sta->lock); | |
564 | return; | |
565 | } | |
566 | ||
567 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
568 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
569 | spin_unlock_bh(&sta->lock); | |
570 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
571 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
572 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
573 | return; | |
574 | } | |
575 | ||
576 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
577 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
578 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
579 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
580 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
581 | == WLAN_STATUS_SUCCESS) { | |
582 | *state |= HT_ADDBA_RECEIVED_MSK; | |
583 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
584 | ||
585 | if (*state == HT_AGG_STATE_OPERATIONAL && | |
586 | local->hw.ampdu_queues) | |
587 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
588 | ||
589 | if (local->ops->ampdu_action) { | |
590 | (void)local->ops->ampdu_action(hw, | |
591 | IEEE80211_AMPDU_TX_RESUME, | |
592 | &sta->sta, tid, &start_seq_num); | |
593 | } | |
594 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
595 | printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid); | |
596 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
597 | spin_unlock_bh(&sta->lock); | |
598 | } else { | |
599 | sta->ampdu_mlme.addba_req_num[tid]++; | |
600 | /* this will allow the state check in stop_BA_session */ | |
601 | *state = HT_AGG_STATE_OPERATIONAL; | |
602 | spin_unlock_bh(&sta->lock); | |
603 | ieee80211_stop_tx_ba_session(hw, sta->sta.addr, tid, | |
604 | WLAN_BACK_INITIATOR); | |
605 | } | |
606 | } |