Commit | Line | Data |
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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
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 | ||
86ab6c5a JB |
21 | /** |
22 | * DOC: TX aggregation | |
23 | * | |
24 | * Aggregation on the TX side requires setting the hardware flag | |
25 | * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues | |
26 | * hardware parameter to the number of hardware AMPDU queues. If there are no | |
27 | * hardware queues then the driver will (currently) have to do all frame | |
28 | * buffering. | |
29 | * | |
30 | * When TX aggregation is started by some subsystem (usually the rate control | |
31 | * algorithm would be appropriate) by calling the | |
32 | * ieee80211_start_tx_ba_session() function, the driver will be notified via | |
33 | * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. | |
34 | * | |
35 | * In response to that, the driver is later required to call the | |
36 | * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) | |
37 | * function, which will start the aggregation session. | |
38 | * | |
39 | * Similarly, when the aggregation session is stopped by | |
40 | * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will | |
41 | * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the | |
42 | * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() | |
43 | * (or ieee80211_stop_tx_ba_cb_irqsafe()). | |
44 | */ | |
45 | ||
b8695a8f JB |
46 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
47 | const u8 *da, u16 tid, | |
48 | u8 dialog_token, u16 start_seq_num, | |
49 | u16 agg_size, u16 timeout) | |
50 | { | |
51 | struct ieee80211_local *local = sdata->local; | |
52 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; | |
53 | struct sk_buff *skb; | |
54 | struct ieee80211_mgmt *mgmt; | |
55 | u16 capab; | |
56 | ||
57 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
58 | ||
59 | if (!skb) { | |
60 | printk(KERN_ERR "%s: failed to allocate buffer " | |
61 | "for addba request frame\n", sdata->dev->name); | |
62 | return; | |
63 | } | |
64 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
65 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
66 | memset(mgmt, 0, 24); | |
67 | memcpy(mgmt->da, da, ETH_ALEN); | |
68 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
69 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
70 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f JB |
71 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
72 | else | |
73 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); | |
74 | ||
75 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
76 | IEEE80211_STYPE_ACTION); | |
77 | ||
78 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
79 | ||
80 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
81 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
82 | ||
83 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
84 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
85 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
86 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
87 | ||
88 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
89 | ||
90 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
91 | mgmt->u.action.u.addba_req.start_seq_num = | |
92 | cpu_to_le16(start_seq_num << 4); | |
93 | ||
94 | ieee80211_tx_skb(sdata, skb, 1); | |
95 | } | |
96 | ||
97 | void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) | |
98 | { | |
99 | struct ieee80211_local *local = sdata->local; | |
100 | struct sk_buff *skb; | |
101 | struct ieee80211_bar *bar; | |
102 | u16 bar_control = 0; | |
103 | ||
104 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
105 | if (!skb) { | |
106 | printk(KERN_ERR "%s: failed to allocate buffer for " | |
107 | "bar frame\n", sdata->dev->name); | |
108 | return; | |
109 | } | |
110 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
111 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
112 | memset(bar, 0, sizeof(*bar)); | |
113 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
114 | IEEE80211_STYPE_BACK_REQ); | |
115 | memcpy(bar->ra, ra, ETH_ALEN); | |
116 | memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); | |
117 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; | |
118 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
119 | bar_control |= (u16)(tid << 12); | |
120 | bar->control = cpu_to_le16(bar_control); | |
121 | bar->start_seq_num = cpu_to_le16(ssn); | |
122 | ||
123 | ieee80211_tx_skb(sdata, skb, 0); | |
124 | } | |
125 | ||
126 | /* | |
127 | * After sending add Block Ack request we activated a timer until | |
128 | * add Block Ack response will arrive from the recipient. | |
129 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
130 | */ | |
131 | static void sta_addba_resp_timer_expired(unsigned long data) | |
132 | { | |
133 | /* not an elegant detour, but there is no choice as the timer passes | |
134 | * only one argument, and both sta_info and TID are needed, so init | |
135 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
136 | * array gives the sta through container_of */ | |
137 | u16 tid = *(u8 *)data; | |
138 | struct sta_info *temp_sta = container_of((void *)data, | |
139 | struct sta_info, timer_to_tid[tid]); | |
140 | ||
141 | struct ieee80211_local *local = temp_sta->local; | |
142 | struct ieee80211_hw *hw = &local->hw; | |
143 | struct sta_info *sta; | |
144 | u8 *state; | |
145 | ||
146 | rcu_read_lock(); | |
147 | ||
148 | sta = sta_info_get(local, temp_sta->sta.addr); | |
149 | if (!sta) { | |
150 | rcu_read_unlock(); | |
151 | return; | |
152 | } | |
153 | ||
154 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
155 | /* check if the TID waits for addBA response */ | |
156 | spin_lock_bh(&sta->lock); | |
157 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
158 | spin_unlock_bh(&sta->lock); | |
159 | *state = HT_AGG_STATE_IDLE; | |
160 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
161 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
162 | "expecting addBA response there", tid); | |
163 | #endif | |
164 | goto timer_expired_exit; | |
165 | } | |
166 | ||
167 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
168 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
169 | #endif | |
170 | ||
171 | /* go through the state check in stop_BA_session */ | |
172 | *state = HT_AGG_STATE_OPERATIONAL; | |
173 | spin_unlock_bh(&sta->lock); | |
174 | ieee80211_stop_tx_ba_session(hw, temp_sta->sta.addr, tid, | |
175 | WLAN_BACK_INITIATOR); | |
176 | ||
177 | timer_expired_exit: | |
178 | rcu_read_unlock(); | |
179 | } | |
180 | ||
181 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
182 | { | |
183 | struct ieee80211_local *local = hw_to_local(hw); | |
184 | struct sta_info *sta; | |
185 | struct ieee80211_sub_if_data *sdata; | |
186 | u16 start_seq_num; | |
187 | u8 *state; | |
188 | int ret = 0; | |
189 | ||
190 | if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) | |
191 | return -EINVAL; | |
192 | ||
193 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
194 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
195 | ra, tid); | |
196 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
197 | ||
198 | rcu_read_lock(); | |
199 | ||
200 | sta = sta_info_get(local, ra); | |
201 | if (!sta) { | |
202 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
203 | printk(KERN_DEBUG "Could not find the station\n"); | |
204 | #endif | |
205 | ret = -ENOENT; | |
206 | goto exit; | |
207 | } | |
208 | ||
8abd3f9b JB |
209 | /* |
210 | * The aggregation code is not prepared to handle | |
211 | * anything but STA/AP due to the BSSID handling. | |
212 | * IBSS could work in the code but isn't supported | |
213 | * by drivers or the standard. | |
214 | */ | |
215 | if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && | |
216 | sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
217 | sta->sdata->vif.type != NL80211_IFTYPE_AP) { | |
218 | ret = -EINVAL; | |
219 | goto exit; | |
220 | } | |
221 | ||
b8695a8f JB |
222 | spin_lock_bh(&sta->lock); |
223 | ||
224 | /* we have tried too many times, receiver does not want A-MPDU */ | |
225 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
226 | ret = -EBUSY; | |
227 | goto err_unlock_sta; | |
228 | } | |
229 | ||
230 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
231 | /* check if the TID is not in aggregation flow already */ | |
232 | if (*state != HT_AGG_STATE_IDLE) { | |
233 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
234 | printk(KERN_DEBUG "BA request denied - session is not " | |
235 | "idle on tid %u\n", tid); | |
236 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
237 | ret = -EAGAIN; | |
238 | goto err_unlock_sta; | |
239 | } | |
240 | ||
241 | /* prepare A-MPDU MLME for Tx aggregation */ | |
242 | sta->ampdu_mlme.tid_tx[tid] = | |
243 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
244 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
245 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
246 | if (net_ratelimit()) | |
247 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
248 | tid); | |
249 | #endif | |
250 | ret = -ENOMEM; | |
251 | goto err_unlock_sta; | |
252 | } | |
253 | /* Tx timer */ | |
254 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
255 | sta_addba_resp_timer_expired; | |
256 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
257 | (unsigned long)&sta->timer_to_tid[tid]; | |
258 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
259 | ||
260 | if (hw->ampdu_queues) { | |
261 | /* create a new queue for this aggregation */ | |
262 | ret = ieee80211_ht_agg_queue_add(local, sta, tid); | |
263 | ||
264 | /* case no queue is available to aggregation | |
265 | * don't switch to aggregation */ | |
266 | if (ret) { | |
267 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
268 | printk(KERN_DEBUG "BA request denied - " | |
269 | "queue unavailable for tid %d\n", tid); | |
270 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
271 | goto err_unlock_queue; | |
272 | } | |
273 | } | |
274 | sdata = sta->sdata; | |
275 | ||
276 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the | |
277 | * call back right away, it must see that the flow has begun */ | |
278 | *state |= HT_ADDBA_REQUESTED_MSK; | |
279 | ||
280 | /* This is slightly racy because the queue isn't stopped */ | |
281 | start_seq_num = sta->tid_seq[tid]; | |
282 | ||
283 | if (local->ops->ampdu_action) | |
284 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, | |
285 | &sta->sta, tid, &start_seq_num); | |
286 | ||
287 | if (ret) { | |
288 | /* No need to requeue the packets in the agg queue, since we | |
289 | * held the tx lock: no packet could be enqueued to the newly | |
290 | * allocated queue */ | |
291 | if (hw->ampdu_queues) | |
292 | ieee80211_ht_agg_queue_remove(local, sta, tid, 0); | |
293 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
294 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
295 | " tid %d\n", tid); | |
296 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
297 | *state = HT_AGG_STATE_IDLE; | |
298 | goto err_unlock_queue; | |
299 | } | |
300 | ||
301 | /* Will put all the packets in the new SW queue */ | |
302 | if (hw->ampdu_queues) | |
303 | ieee80211_requeue(local, ieee802_1d_to_ac[tid]); | |
304 | spin_unlock_bh(&sta->lock); | |
305 | ||
306 | /* send an addBA request */ | |
307 | sta->ampdu_mlme.dialog_token_allocator++; | |
308 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
309 | sta->ampdu_mlme.dialog_token_allocator; | |
310 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
311 | ||
312 | ||
313 | ieee80211_send_addba_request(sta->sdata, ra, tid, | |
314 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, | |
315 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
316 | 0x40, 5000); | |
317 | /* activate the timer for the recipient's addBA response */ | |
318 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
319 | jiffies + ADDBA_RESP_INTERVAL; | |
320 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
321 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
322 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
323 | #endif | |
324 | goto exit; | |
325 | ||
326 | err_unlock_queue: | |
327 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
328 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
329 | ret = -EBUSY; | |
330 | err_unlock_sta: | |
331 | spin_unlock_bh(&sta->lock); | |
332 | exit: | |
333 | rcu_read_unlock(); | |
334 | return ret; | |
335 | } | |
336 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
337 | ||
338 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
339 | { | |
340 | struct ieee80211_local *local = hw_to_local(hw); | |
341 | struct sta_info *sta; | |
342 | u8 *state; | |
343 | ||
344 | if (tid >= STA_TID_NUM) { | |
345 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
346 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
347 | tid, STA_TID_NUM); | |
348 | #endif | |
349 | return; | |
350 | } | |
351 | ||
352 | rcu_read_lock(); | |
353 | sta = sta_info_get(local, ra); | |
354 | if (!sta) { | |
355 | rcu_read_unlock(); | |
356 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
357 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
358 | #endif | |
359 | return; | |
360 | } | |
361 | ||
362 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
363 | spin_lock_bh(&sta->lock); | |
364 | ||
365 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
366 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
367 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
368 | *state); | |
369 | #endif | |
370 | spin_unlock_bh(&sta->lock); | |
371 | rcu_read_unlock(); | |
372 | return; | |
373 | } | |
374 | ||
375 | WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); | |
376 | ||
377 | *state |= HT_ADDBA_DRV_READY_MSK; | |
378 | ||
379 | if (*state == HT_AGG_STATE_OPERATIONAL) { | |
380 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
381 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
382 | #endif | |
383 | if (hw->ampdu_queues) | |
384 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
385 | } | |
386 | spin_unlock_bh(&sta->lock); | |
387 | rcu_read_unlock(); | |
388 | } | |
389 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
390 | ||
86ab6c5a JB |
391 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
392 | const u8 *ra, u16 tid) | |
393 | { | |
394 | struct ieee80211_local *local = hw_to_local(hw); | |
395 | struct ieee80211_ra_tid *ra_tid; | |
396 | struct sk_buff *skb = dev_alloc_skb(0); | |
397 | ||
398 | if (unlikely(!skb)) { | |
399 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
400 | if (net_ratelimit()) | |
401 | printk(KERN_WARNING "%s: Not enough memory, " | |
402 | "dropping start BA session", skb->dev->name); | |
403 | #endif | |
404 | return; | |
405 | } | |
406 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
407 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
408 | ra_tid->tid = tid; | |
409 | ||
410 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
411 | skb_queue_tail(&local->skb_queue, skb); | |
412 | tasklet_schedule(&local->tasklet); | |
413 | } | |
414 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
415 | ||
b8695a8f JB |
416 | |
417 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
418 | u8 *ra, u16 tid, | |
419 | enum ieee80211_back_parties initiator) | |
420 | { | |
421 | struct ieee80211_local *local = hw_to_local(hw); | |
422 | struct sta_info *sta; | |
423 | u8 *state; | |
424 | int ret = 0; | |
425 | ||
426 | if (tid >= STA_TID_NUM) | |
427 | return -EINVAL; | |
428 | ||
429 | rcu_read_lock(); | |
430 | sta = sta_info_get(local, ra); | |
431 | if (!sta) { | |
432 | rcu_read_unlock(); | |
433 | return -ENOENT; | |
434 | } | |
435 | ||
436 | /* check if the TID is in aggregation */ | |
437 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
438 | spin_lock_bh(&sta->lock); | |
439 | ||
440 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
441 | ret = -ENOENT; | |
442 | goto stop_BA_exit; | |
443 | } | |
444 | ||
445 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
446 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
447 | ra, tid); | |
448 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
449 | ||
450 | if (hw->ampdu_queues) | |
451 | ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); | |
452 | ||
453 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | | |
454 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
455 | ||
456 | if (local->ops->ampdu_action) | |
457 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, | |
458 | &sta->sta, tid, NULL); | |
459 | ||
955d3fe3 JB |
460 | /* HW shall not deny going back to legacy */ |
461 | if (WARN_ON(ret)) { | |
b8695a8f JB |
462 | *state = HT_AGG_STATE_OPERATIONAL; |
463 | if (hw->ampdu_queues) | |
464 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
465 | goto stop_BA_exit; | |
466 | } | |
467 | ||
468 | stop_BA_exit: | |
469 | spin_unlock_bh(&sta->lock); | |
470 | rcu_read_unlock(); | |
471 | return ret; | |
472 | } | |
473 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
474 | ||
475 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
476 | { | |
477 | struct ieee80211_local *local = hw_to_local(hw); | |
478 | struct sta_info *sta; | |
479 | u8 *state; | |
480 | int agg_queue; | |
481 | ||
482 | if (tid >= STA_TID_NUM) { | |
483 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
484 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
485 | tid, STA_TID_NUM); | |
486 | #endif | |
487 | return; | |
488 | } | |
489 | ||
490 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
491 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
492 | ra, tid); | |
493 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
494 | ||
495 | rcu_read_lock(); | |
496 | sta = sta_info_get(local, ra); | |
497 | if (!sta) { | |
498 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
499 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
500 | #endif | |
501 | rcu_read_unlock(); | |
502 | return; | |
503 | } | |
504 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
505 | ||
506 | /* NOTE: no need to use sta->lock in this state check, as | |
507 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
508 | * pass through per sta/tid | |
509 | */ | |
510 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
511 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
512 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
513 | #endif | |
514 | rcu_read_unlock(); | |
515 | return; | |
516 | } | |
517 | ||
518 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
519 | ieee80211_send_delba(sta->sdata, ra, tid, | |
520 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
521 | ||
522 | if (hw->ampdu_queues) { | |
523 | agg_queue = sta->tid_to_tx_q[tid]; | |
524 | ieee80211_ht_agg_queue_remove(local, sta, tid, 1); | |
525 | ||
526 | /* We just requeued the all the frames that were in the | |
527 | * removed queue, and since we might miss a softirq we do | |
528 | * netif_schedule_queue. ieee80211_wake_queue is not used | |
529 | * here as this queue is not necessarily stopped | |
530 | */ | |
531 | netif_schedule_queue(netdev_get_tx_queue(local->mdev, | |
532 | agg_queue)); | |
533 | } | |
534 | spin_lock_bh(&sta->lock); | |
535 | *state = HT_AGG_STATE_IDLE; | |
536 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
537 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
538 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
539 | spin_unlock_bh(&sta->lock); | |
540 | ||
541 | rcu_read_unlock(); | |
542 | } | |
543 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
544 | ||
b8695a8f JB |
545 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
546 | const u8 *ra, u16 tid) | |
547 | { | |
548 | struct ieee80211_local *local = hw_to_local(hw); | |
549 | struct ieee80211_ra_tid *ra_tid; | |
550 | struct sk_buff *skb = dev_alloc_skb(0); | |
551 | ||
552 | if (unlikely(!skb)) { | |
553 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
554 | if (net_ratelimit()) | |
555 | printk(KERN_WARNING "%s: Not enough memory, " | |
556 | "dropping stop BA session", skb->dev->name); | |
557 | #endif | |
558 | return; | |
559 | } | |
560 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
561 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
562 | ra_tid->tid = tid; | |
563 | ||
564 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
565 | skb_queue_tail(&local->skb_queue, skb); | |
566 | tasklet_schedule(&local->tasklet); | |
567 | } | |
568 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
569 | ||
86ab6c5a | 570 | |
b8695a8f JB |
571 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
572 | struct sta_info *sta, | |
573 | struct ieee80211_mgmt *mgmt, | |
574 | size_t len) | |
575 | { | |
576 | struct ieee80211_hw *hw = &local->hw; | |
577 | u16 capab; | |
578 | u16 tid, start_seq_num; | |
579 | u8 *state; | |
580 | ||
581 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
582 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
583 | ||
584 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
585 | ||
586 | spin_lock_bh(&sta->lock); | |
587 | ||
588 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
589 | spin_unlock_bh(&sta->lock); | |
590 | return; | |
591 | } | |
592 | ||
593 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
594 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
595 | spin_unlock_bh(&sta->lock); | |
596 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
597 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
598 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
599 | return; | |
600 | } | |
601 | ||
602 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
603 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
604 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
605 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
606 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
607 | == WLAN_STATUS_SUCCESS) { | |
608 | *state |= HT_ADDBA_RECEIVED_MSK; | |
609 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
610 | ||
611 | if (*state == HT_AGG_STATE_OPERATIONAL && | |
612 | local->hw.ampdu_queues) | |
613 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
614 | ||
615 | if (local->ops->ampdu_action) { | |
616 | (void)local->ops->ampdu_action(hw, | |
617 | IEEE80211_AMPDU_TX_RESUME, | |
618 | &sta->sta, tid, &start_seq_num); | |
619 | } | |
620 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
621 | printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid); | |
622 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
623 | spin_unlock_bh(&sta->lock); | |
624 | } else { | |
625 | sta->ampdu_mlme.addba_req_num[tid]++; | |
626 | /* this will allow the state check in stop_BA_session */ | |
627 | *state = HT_AGG_STATE_OPERATIONAL; | |
628 | spin_unlock_bh(&sta->lock); | |
629 | ieee80211_stop_tx_ba_session(hw, sta->sta.addr, tid, | |
630 | WLAN_BACK_INITIATOR); | |
631 | } | |
632 | } |