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> | |
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 | ||
849b7967 JB |
126 | static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
127 | enum ieee80211_back_parties initiator) | |
23e6a7ea | 128 | { |
849b7967 | 129 | struct ieee80211_local *local = sta->local; |
23e6a7ea JB |
130 | int ret; |
131 | u8 *state; | |
132 | ||
133 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
134 | ||
135 | if (local->hw.ampdu_queues) | |
136 | ieee80211_stop_queue(&local->hw, sta->tid_to_tx_q[tid]); | |
137 | ||
138 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | | |
139 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
140 | ||
141 | ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP, | |
142 | &sta->sta, tid, NULL); | |
143 | ||
144 | /* HW shall not deny going back to legacy */ | |
145 | if (WARN_ON(ret)) { | |
146 | *state = HT_AGG_STATE_OPERATIONAL; | |
147 | if (local->hw.ampdu_queues) | |
148 | ieee80211_wake_queue(&local->hw, sta->tid_to_tx_q[tid]); | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
b8695a8f JB |
154 | /* |
155 | * After sending add Block Ack request we activated a timer until | |
156 | * add Block Ack response will arrive from the recipient. | |
157 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
158 | */ | |
159 | static void sta_addba_resp_timer_expired(unsigned long data) | |
160 | { | |
161 | /* not an elegant detour, but there is no choice as the timer passes | |
162 | * only one argument, and both sta_info and TID are needed, so init | |
163 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
164 | * array gives the sta through container_of */ | |
165 | u16 tid = *(u8 *)data; | |
23e6a7ea | 166 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 167 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
168 | u8 *state; |
169 | ||
b8695a8f | 170 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 171 | |
b8695a8f JB |
172 | /* check if the TID waits for addBA response */ |
173 | spin_lock_bh(&sta->lock); | |
174 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
175 | spin_unlock_bh(&sta->lock); | |
176 | *state = HT_AGG_STATE_IDLE; | |
177 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
178 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
179 | "expecting addBA response there", tid); | |
180 | #endif | |
23e6a7ea | 181 | return; |
b8695a8f JB |
182 | } |
183 | ||
184 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
185 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
186 | #endif | |
187 | ||
849b7967 | 188 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 189 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
190 | } |
191 | ||
192 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
193 | { | |
194 | struct ieee80211_local *local = hw_to_local(hw); | |
195 | struct sta_info *sta; | |
196 | struct ieee80211_sub_if_data *sdata; | |
197 | u16 start_seq_num; | |
198 | u8 *state; | |
199 | int ret = 0; | |
200 | ||
23e6a7ea JB |
201 | if (WARN_ON(!local->ops->ampdu_action)) |
202 | return -EINVAL; | |
203 | ||
b8695a8f JB |
204 | if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) |
205 | return -EINVAL; | |
206 | ||
207 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
208 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
209 | ra, tid); | |
210 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
211 | ||
212 | rcu_read_lock(); | |
213 | ||
214 | sta = sta_info_get(local, ra); | |
215 | if (!sta) { | |
216 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
217 | printk(KERN_DEBUG "Could not find the station\n"); | |
218 | #endif | |
219 | ret = -ENOENT; | |
220 | goto exit; | |
221 | } | |
222 | ||
8abd3f9b JB |
223 | /* |
224 | * The aggregation code is not prepared to handle | |
225 | * anything but STA/AP due to the BSSID handling. | |
226 | * IBSS could work in the code but isn't supported | |
227 | * by drivers or the standard. | |
228 | */ | |
229 | if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && | |
230 | sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
231 | sta->sdata->vif.type != NL80211_IFTYPE_AP) { | |
232 | ret = -EINVAL; | |
233 | goto exit; | |
234 | } | |
235 | ||
b8695a8f JB |
236 | spin_lock_bh(&sta->lock); |
237 | ||
238 | /* we have tried too many times, receiver does not want A-MPDU */ | |
239 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
240 | ret = -EBUSY; | |
241 | goto err_unlock_sta; | |
242 | } | |
243 | ||
244 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
245 | /* check if the TID is not in aggregation flow already */ | |
246 | if (*state != HT_AGG_STATE_IDLE) { | |
247 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
248 | printk(KERN_DEBUG "BA request denied - session is not " | |
249 | "idle on tid %u\n", tid); | |
250 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
251 | ret = -EAGAIN; | |
252 | goto err_unlock_sta; | |
253 | } | |
254 | ||
255 | /* prepare A-MPDU MLME for Tx aggregation */ | |
256 | sta->ampdu_mlme.tid_tx[tid] = | |
257 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
258 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
259 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
260 | if (net_ratelimit()) | |
261 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
262 | tid); | |
263 | #endif | |
264 | ret = -ENOMEM; | |
265 | goto err_unlock_sta; | |
266 | } | |
267 | /* Tx timer */ | |
268 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
269 | sta_addba_resp_timer_expired; | |
270 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
271 | (unsigned long)&sta->timer_to_tid[tid]; | |
272 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
273 | ||
274 | if (hw->ampdu_queues) { | |
275 | /* create a new queue for this aggregation */ | |
276 | ret = ieee80211_ht_agg_queue_add(local, sta, tid); | |
277 | ||
278 | /* case no queue is available to aggregation | |
279 | * don't switch to aggregation */ | |
280 | if (ret) { | |
281 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
282 | printk(KERN_DEBUG "BA request denied - " | |
283 | "queue unavailable for tid %d\n", tid); | |
284 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
285 | goto err_unlock_queue; | |
286 | } | |
287 | } | |
288 | sdata = sta->sdata; | |
289 | ||
290 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the | |
291 | * call back right away, it must see that the flow has begun */ | |
292 | *state |= HT_ADDBA_REQUESTED_MSK; | |
293 | ||
294 | /* This is slightly racy because the queue isn't stopped */ | |
295 | start_seq_num = sta->tid_seq[tid]; | |
296 | ||
23e6a7ea JB |
297 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, |
298 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
299 | |
300 | if (ret) { | |
301 | /* No need to requeue the packets in the agg queue, since we | |
302 | * held the tx lock: no packet could be enqueued to the newly | |
303 | * allocated queue */ | |
304 | if (hw->ampdu_queues) | |
305 | ieee80211_ht_agg_queue_remove(local, sta, tid, 0); | |
306 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
307 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
308 | " tid %d\n", tid); | |
309 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
310 | *state = HT_AGG_STATE_IDLE; | |
311 | goto err_unlock_queue; | |
312 | } | |
313 | ||
314 | /* Will put all the packets in the new SW queue */ | |
315 | if (hw->ampdu_queues) | |
316 | ieee80211_requeue(local, ieee802_1d_to_ac[tid]); | |
317 | spin_unlock_bh(&sta->lock); | |
318 | ||
319 | /* send an addBA request */ | |
320 | sta->ampdu_mlme.dialog_token_allocator++; | |
321 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
322 | sta->ampdu_mlme.dialog_token_allocator; | |
323 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
324 | ||
325 | ||
326 | ieee80211_send_addba_request(sta->sdata, ra, tid, | |
327 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, | |
328 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
329 | 0x40, 5000); | |
330 | /* activate the timer for the recipient's addBA response */ | |
331 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
332 | jiffies + ADDBA_RESP_INTERVAL; | |
333 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
334 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
335 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
336 | #endif | |
337 | goto exit; | |
338 | ||
339 | err_unlock_queue: | |
340 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
341 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
342 | ret = -EBUSY; | |
343 | err_unlock_sta: | |
344 | spin_unlock_bh(&sta->lock); | |
345 | exit: | |
346 | rcu_read_unlock(); | |
347 | return ret; | |
348 | } | |
349 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
350 | ||
351 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
352 | { | |
353 | struct ieee80211_local *local = hw_to_local(hw); | |
354 | struct sta_info *sta; | |
355 | u8 *state; | |
356 | ||
357 | if (tid >= STA_TID_NUM) { | |
358 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
359 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
360 | tid, STA_TID_NUM); | |
361 | #endif | |
362 | return; | |
363 | } | |
364 | ||
365 | rcu_read_lock(); | |
366 | sta = sta_info_get(local, ra); | |
367 | if (!sta) { | |
368 | rcu_read_unlock(); | |
369 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
370 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
371 | #endif | |
372 | return; | |
373 | } | |
374 | ||
375 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
376 | spin_lock_bh(&sta->lock); | |
377 | ||
378 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
379 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
380 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
381 | *state); | |
382 | #endif | |
383 | spin_unlock_bh(&sta->lock); | |
384 | rcu_read_unlock(); | |
385 | return; | |
386 | } | |
387 | ||
388 | WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); | |
389 | ||
390 | *state |= HT_ADDBA_DRV_READY_MSK; | |
391 | ||
392 | if (*state == HT_AGG_STATE_OPERATIONAL) { | |
393 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
394 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
395 | #endif | |
396 | if (hw->ampdu_queues) | |
397 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
398 | } | |
399 | spin_unlock_bh(&sta->lock); | |
400 | rcu_read_unlock(); | |
401 | } | |
402 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
403 | ||
86ab6c5a JB |
404 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
405 | const u8 *ra, u16 tid) | |
406 | { | |
407 | struct ieee80211_local *local = hw_to_local(hw); | |
408 | struct ieee80211_ra_tid *ra_tid; | |
409 | struct sk_buff *skb = dev_alloc_skb(0); | |
410 | ||
411 | if (unlikely(!skb)) { | |
412 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
413 | if (net_ratelimit()) | |
414 | printk(KERN_WARNING "%s: Not enough memory, " | |
415 | "dropping start BA session", skb->dev->name); | |
416 | #endif | |
417 | return; | |
418 | } | |
419 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
420 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
421 | ra_tid->tid = tid; | |
422 | ||
423 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
424 | skb_queue_tail(&local->skb_queue, skb); | |
425 | tasklet_schedule(&local->tasklet); | |
426 | } | |
427 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
428 | ||
849b7967 JB |
429 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
430 | enum ieee80211_back_parties initiator) | |
431 | { | |
432 | u8 *state; | |
433 | int ret; | |
434 | ||
435 | /* check if the TID is in aggregation */ | |
436 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
437 | spin_lock_bh(&sta->lock); | |
438 | ||
439 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
440 | ret = -ENOENT; | |
441 | goto unlock; | |
442 | } | |
443 | ||
444 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
445 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
446 | sta->sta.addr, tid); | |
447 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
448 | ||
449 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); | |
450 | ||
451 | unlock: | |
452 | spin_unlock_bh(&sta->lock); | |
453 | return ret; | |
454 | } | |
b8695a8f JB |
455 | |
456 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
457 | u8 *ra, u16 tid, | |
458 | enum ieee80211_back_parties initiator) | |
459 | { | |
460 | struct ieee80211_local *local = hw_to_local(hw); | |
461 | struct sta_info *sta; | |
b8695a8f JB |
462 | int ret = 0; |
463 | ||
23e6a7ea JB |
464 | if (WARN_ON(!local->ops->ampdu_action)) |
465 | return -EINVAL; | |
466 | ||
b8695a8f JB |
467 | if (tid >= STA_TID_NUM) |
468 | return -EINVAL; | |
469 | ||
470 | rcu_read_lock(); | |
471 | sta = sta_info_get(local, ra); | |
472 | if (!sta) { | |
473 | rcu_read_unlock(); | |
474 | return -ENOENT; | |
475 | } | |
476 | ||
849b7967 | 477 | ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
478 | rcu_read_unlock(); |
479 | return ret; | |
480 | } | |
481 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
482 | ||
483 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
484 | { | |
485 | struct ieee80211_local *local = hw_to_local(hw); | |
486 | struct sta_info *sta; | |
487 | u8 *state; | |
488 | int agg_queue; | |
489 | ||
490 | if (tid >= STA_TID_NUM) { | |
491 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
492 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
493 | tid, STA_TID_NUM); | |
494 | #endif | |
495 | return; | |
496 | } | |
497 | ||
498 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
499 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
500 | ra, tid); | |
501 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
502 | ||
503 | rcu_read_lock(); | |
504 | sta = sta_info_get(local, ra); | |
505 | if (!sta) { | |
506 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
507 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
508 | #endif | |
509 | rcu_read_unlock(); | |
510 | return; | |
511 | } | |
512 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
513 | ||
514 | /* NOTE: no need to use sta->lock in this state check, as | |
515 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
516 | * pass through per sta/tid | |
517 | */ | |
518 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
519 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
520 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
521 | #endif | |
522 | rcu_read_unlock(); | |
523 | return; | |
524 | } | |
525 | ||
526 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
527 | ieee80211_send_delba(sta->sdata, ra, tid, | |
528 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
529 | ||
530 | if (hw->ampdu_queues) { | |
531 | agg_queue = sta->tid_to_tx_q[tid]; | |
532 | ieee80211_ht_agg_queue_remove(local, sta, tid, 1); | |
533 | ||
534 | /* We just requeued the all the frames that were in the | |
535 | * removed queue, and since we might miss a softirq we do | |
536 | * netif_schedule_queue. ieee80211_wake_queue is not used | |
537 | * here as this queue is not necessarily stopped | |
538 | */ | |
539 | netif_schedule_queue(netdev_get_tx_queue(local->mdev, | |
540 | agg_queue)); | |
541 | } | |
542 | spin_lock_bh(&sta->lock); | |
543 | *state = HT_AGG_STATE_IDLE; | |
544 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
545 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
546 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
547 | spin_unlock_bh(&sta->lock); | |
548 | ||
549 | rcu_read_unlock(); | |
550 | } | |
551 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
552 | ||
b8695a8f JB |
553 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
554 | const u8 *ra, u16 tid) | |
555 | { | |
556 | struct ieee80211_local *local = hw_to_local(hw); | |
557 | struct ieee80211_ra_tid *ra_tid; | |
558 | struct sk_buff *skb = dev_alloc_skb(0); | |
559 | ||
560 | if (unlikely(!skb)) { | |
561 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
562 | if (net_ratelimit()) | |
563 | printk(KERN_WARNING "%s: Not enough memory, " | |
564 | "dropping stop BA session", skb->dev->name); | |
565 | #endif | |
566 | return; | |
567 | } | |
568 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
569 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
570 | ra_tid->tid = tid; | |
571 | ||
572 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
573 | skb_queue_tail(&local->skb_queue, skb); | |
574 | tasklet_schedule(&local->tasklet); | |
575 | } | |
576 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
577 | ||
86ab6c5a | 578 | |
b8695a8f JB |
579 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
580 | struct sta_info *sta, | |
581 | struct ieee80211_mgmt *mgmt, | |
582 | size_t len) | |
583 | { | |
584 | struct ieee80211_hw *hw = &local->hw; | |
585 | u16 capab; | |
586 | u16 tid, start_seq_num; | |
587 | u8 *state; | |
588 | ||
589 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
590 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
591 | ||
592 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
593 | ||
594 | spin_lock_bh(&sta->lock); | |
595 | ||
596 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
597 | spin_unlock_bh(&sta->lock); | |
598 | return; | |
599 | } | |
600 | ||
601 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
602 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
603 | spin_unlock_bh(&sta->lock); | |
604 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
605 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
606 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
607 | return; | |
608 | } | |
609 | ||
610 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
611 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
612 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
613 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
614 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
615 | == WLAN_STATUS_SUCCESS) { | |
616 | *state |= HT_ADDBA_RECEIVED_MSK; | |
617 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
618 | ||
619 | if (*state == HT_AGG_STATE_OPERATIONAL && | |
620 | local->hw.ampdu_queues) | |
621 | ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); | |
622 | ||
623 | if (local->ops->ampdu_action) { | |
624 | (void)local->ops->ampdu_action(hw, | |
625 | IEEE80211_AMPDU_TX_RESUME, | |
626 | &sta->sta, tid, &start_seq_num); | |
627 | } | |
628 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
629 | printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid); | |
630 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
b8695a8f JB |
631 | } else { |
632 | sta->ampdu_mlme.addba_req_num[tid]++; | |
849b7967 | 633 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 634 | } |
849b7967 | 635 | spin_unlock_bh(&sta->lock); |
b8695a8f | 636 | } |