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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 | ||
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 | ||
96f5e66e JB |
135 | if (local->hw.ampdu_queues) { |
136 | if (initiator) { | |
137 | /* | |
138 | * Stop the AC queue to avoid issues where we send | |
139 | * unaggregated frames already before the delba. | |
140 | */ | |
141 | ieee80211_stop_queue_by_reason(&local->hw, | |
142 | local->hw.queues + sta->tid_to_tx_q[tid], | |
143 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
144 | } | |
23e6a7ea | 145 | |
96f5e66e JB |
146 | /* |
147 | * Pretend the driver woke the queue, just in case | |
148 | * it disabled it before the session was stopped. | |
149 | */ | |
150 | ieee80211_wake_queue( | |
151 | &local->hw, local->hw.queues + sta->tid_to_tx_q[tid]); | |
152 | } | |
23e6a7ea JB |
153 | *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
154 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
155 | ||
156 | ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP, | |
157 | &sta->sta, tid, NULL); | |
158 | ||
159 | /* HW shall not deny going back to legacy */ | |
160 | if (WARN_ON(ret)) { | |
161 | *state = HT_AGG_STATE_OPERATIONAL; | |
23e6a7ea JB |
162 | } |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
b8695a8f JB |
167 | /* |
168 | * After sending add Block Ack request we activated a timer until | |
169 | * add Block Ack response will arrive from the recipient. | |
170 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
171 | */ | |
172 | static void sta_addba_resp_timer_expired(unsigned long data) | |
173 | { | |
174 | /* not an elegant detour, but there is no choice as the timer passes | |
175 | * only one argument, and both sta_info and TID are needed, so init | |
176 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
177 | * array gives the sta through container_of */ | |
178 | u16 tid = *(u8 *)data; | |
23e6a7ea | 179 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 180 | struct sta_info, timer_to_tid[tid]); |
b8695a8f JB |
181 | u8 *state; |
182 | ||
b8695a8f | 183 | state = &sta->ampdu_mlme.tid_state_tx[tid]; |
23e6a7ea | 184 | |
b8695a8f JB |
185 | /* check if the TID waits for addBA response */ |
186 | spin_lock_bh(&sta->lock); | |
187 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
188 | spin_unlock_bh(&sta->lock); | |
189 | *state = HT_AGG_STATE_IDLE; | |
190 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
191 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
192 | "expecting addBA response there", tid); | |
193 | #endif | |
23e6a7ea | 194 | return; |
b8695a8f JB |
195 | } |
196 | ||
197 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
198 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
199 | #endif | |
200 | ||
849b7967 | 201 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 202 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
203 | } |
204 | ||
96f5e66e JB |
205 | static inline int ieee80211_ac_from_tid(int tid) |
206 | { | |
207 | return ieee802_1d_to_ac[tid & 7]; | |
208 | } | |
209 | ||
b8695a8f JB |
210 | int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
211 | { | |
212 | struct ieee80211_local *local = hw_to_local(hw); | |
213 | struct sta_info *sta; | |
214 | struct ieee80211_sub_if_data *sdata; | |
b8695a8f | 215 | u8 *state; |
96f5e66e JB |
216 | int i, qn = -1, ret = 0; |
217 | u16 start_seq_num; | |
b8695a8f | 218 | |
23e6a7ea JB |
219 | if (WARN_ON(!local->ops->ampdu_action)) |
220 | return -EINVAL; | |
221 | ||
b8695a8f JB |
222 | if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION)) |
223 | return -EINVAL; | |
224 | ||
225 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
226 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
227 | ra, tid); | |
228 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
229 | ||
96f5e66e JB |
230 | if (hw->ampdu_queues && ieee80211_ac_from_tid(tid) == 0) { |
231 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
232 | printk(KERN_DEBUG "rejecting on voice AC\n"); | |
233 | #endif | |
234 | return -EINVAL; | |
235 | } | |
236 | ||
b8695a8f JB |
237 | rcu_read_lock(); |
238 | ||
239 | sta = sta_info_get(local, ra); | |
240 | if (!sta) { | |
241 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
242 | printk(KERN_DEBUG "Could not find the station\n"); | |
243 | #endif | |
244 | ret = -ENOENT; | |
96f5e66e | 245 | goto unlock; |
b8695a8f JB |
246 | } |
247 | ||
8abd3f9b JB |
248 | /* |
249 | * The aggregation code is not prepared to handle | |
250 | * anything but STA/AP due to the BSSID handling. | |
251 | * IBSS could work in the code but isn't supported | |
252 | * by drivers or the standard. | |
253 | */ | |
254 | if (sta->sdata->vif.type != NL80211_IFTYPE_STATION && | |
255 | sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
256 | sta->sdata->vif.type != NL80211_IFTYPE_AP) { | |
257 | ret = -EINVAL; | |
96f5e66e | 258 | goto unlock; |
8abd3f9b JB |
259 | } |
260 | ||
b8695a8f JB |
261 | spin_lock_bh(&sta->lock); |
262 | ||
96f5e66e JB |
263 | sdata = sta->sdata; |
264 | ||
b8695a8f JB |
265 | /* we have tried too many times, receiver does not want A-MPDU */ |
266 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
267 | ret = -EBUSY; | |
268 | goto err_unlock_sta; | |
269 | } | |
270 | ||
271 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
272 | /* check if the TID is not in aggregation flow already */ | |
273 | if (*state != HT_AGG_STATE_IDLE) { | |
274 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
275 | printk(KERN_DEBUG "BA request denied - session is not " | |
276 | "idle on tid %u\n", tid); | |
277 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
278 | ret = -EAGAIN; | |
279 | goto err_unlock_sta; | |
280 | } | |
281 | ||
96f5e66e JB |
282 | if (hw->ampdu_queues) { |
283 | spin_lock(&local->queue_stop_reason_lock); | |
284 | /* reserve a new queue for this session */ | |
285 | for (i = 0; i < local->hw.ampdu_queues; i++) { | |
286 | if (local->ampdu_ac_queue[i] < 0) { | |
287 | qn = i; | |
288 | local->ampdu_ac_queue[qn] = | |
289 | ieee80211_ac_from_tid(tid); | |
290 | break; | |
291 | } | |
292 | } | |
293 | spin_unlock(&local->queue_stop_reason_lock); | |
294 | ||
295 | if (qn < 0) { | |
296 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
297 | printk(KERN_DEBUG "BA request denied - " | |
298 | "queue unavailable for tid %d\n", tid); | |
299 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
300 | ret = -ENOSPC; | |
301 | goto err_unlock_sta; | |
302 | } | |
303 | ||
304 | /* | |
305 | * If we successfully allocate the session, we can't have | |
306 | * anything going on on the queue this TID maps into, so | |
307 | * stop it for now. This is a "virtual" stop using the same | |
308 | * mechanism that drivers will use. | |
309 | * | |
310 | * XXX: queue up frames for this session in the sta_info | |
311 | * struct instead to avoid hitting all other STAs. | |
312 | */ | |
313 | ieee80211_stop_queue_by_reason( | |
314 | &local->hw, hw->queues + qn, | |
315 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
316 | } | |
317 | ||
b8695a8f JB |
318 | /* prepare A-MPDU MLME for Tx aggregation */ |
319 | sta->ampdu_mlme.tid_tx[tid] = | |
320 | kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); | |
321 | if (!sta->ampdu_mlme.tid_tx[tid]) { | |
322 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
323 | if (net_ratelimit()) | |
324 | printk(KERN_ERR "allocate tx mlme to tid %d failed\n", | |
325 | tid); | |
326 | #endif | |
327 | ret = -ENOMEM; | |
96f5e66e | 328 | goto err_return_queue; |
b8695a8f | 329 | } |
96f5e66e | 330 | |
b8695a8f JB |
331 | /* Tx timer */ |
332 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = | |
333 | sta_addba_resp_timer_expired; | |
334 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = | |
335 | (unsigned long)&sta->timer_to_tid[tid]; | |
336 | init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
337 | ||
b8695a8f JB |
338 | /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
339 | * call back right away, it must see that the flow has begun */ | |
340 | *state |= HT_ADDBA_REQUESTED_MSK; | |
341 | ||
b8695a8f JB |
342 | start_seq_num = sta->tid_seq[tid]; |
343 | ||
23e6a7ea JB |
344 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, |
345 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
346 | |
347 | if (ret) { | |
b8695a8f JB |
348 | #ifdef CONFIG_MAC80211_HT_DEBUG |
349 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
350 | " tid %d\n", tid); | |
351 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
352 | *state = HT_AGG_STATE_IDLE; | |
96f5e66e | 353 | goto err_free; |
b8695a8f | 354 | } |
96f5e66e | 355 | sta->tid_to_tx_q[tid] = qn; |
b8695a8f | 356 | |
b8695a8f JB |
357 | spin_unlock_bh(&sta->lock); |
358 | ||
359 | /* send an addBA request */ | |
360 | sta->ampdu_mlme.dialog_token_allocator++; | |
361 | sta->ampdu_mlme.tid_tx[tid]->dialog_token = | |
362 | sta->ampdu_mlme.dialog_token_allocator; | |
363 | sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; | |
364 | ||
b8695a8f JB |
365 | ieee80211_send_addba_request(sta->sdata, ra, tid, |
366 | sta->ampdu_mlme.tid_tx[tid]->dialog_token, | |
367 | sta->ampdu_mlme.tid_tx[tid]->ssn, | |
368 | 0x40, 5000); | |
369 | /* activate the timer for the recipient's addBA response */ | |
370 | sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = | |
371 | jiffies + ADDBA_RESP_INTERVAL; | |
372 | add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
373 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
374 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
375 | #endif | |
96f5e66e | 376 | goto unlock; |
b8695a8f | 377 | |
96f5e66e | 378 | err_free: |
b8695a8f JB |
379 | kfree(sta->ampdu_mlme.tid_tx[tid]); |
380 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
96f5e66e JB |
381 | err_return_queue: |
382 | if (qn >= 0) { | |
383 | /* We failed, so start queue again right away. */ | |
384 | ieee80211_wake_queue_by_reason(hw, hw->queues + qn, | |
385 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
386 | /* give queue back to pool */ | |
387 | spin_lock(&local->queue_stop_reason_lock); | |
388 | local->ampdu_ac_queue[qn] = -1; | |
389 | spin_unlock(&local->queue_stop_reason_lock); | |
390 | } | |
391 | err_unlock_sta: | |
b8695a8f | 392 | spin_unlock_bh(&sta->lock); |
96f5e66e | 393 | unlock: |
b8695a8f JB |
394 | rcu_read_unlock(); |
395 | return ret; | |
396 | } | |
397 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
398 | ||
399 | void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) | |
400 | { | |
401 | struct ieee80211_local *local = hw_to_local(hw); | |
402 | struct sta_info *sta; | |
403 | u8 *state; | |
404 | ||
405 | if (tid >= STA_TID_NUM) { | |
406 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
407 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
408 | tid, STA_TID_NUM); | |
409 | #endif | |
410 | return; | |
411 | } | |
412 | ||
413 | rcu_read_lock(); | |
414 | sta = sta_info_get(local, ra); | |
415 | if (!sta) { | |
416 | rcu_read_unlock(); | |
417 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
418 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
419 | #endif | |
420 | return; | |
421 | } | |
422 | ||
423 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
424 | spin_lock_bh(&sta->lock); | |
425 | ||
96f5e66e | 426 | if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
b8695a8f JB |
427 | #ifdef CONFIG_MAC80211_HT_DEBUG |
428 | printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", | |
429 | *state); | |
430 | #endif | |
431 | spin_unlock_bh(&sta->lock); | |
432 | rcu_read_unlock(); | |
433 | return; | |
434 | } | |
435 | ||
96f5e66e JB |
436 | if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
437 | goto out; | |
b8695a8f JB |
438 | |
439 | *state |= HT_ADDBA_DRV_READY_MSK; | |
440 | ||
441 | if (*state == HT_AGG_STATE_OPERATIONAL) { | |
442 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
443 | printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); | |
444 | #endif | |
96f5e66e JB |
445 | if (hw->ampdu_queues) { |
446 | /* | |
447 | * Wake up this queue, we stopped it earlier, | |
448 | * this will in turn wake the entire AC. | |
449 | */ | |
450 | ieee80211_wake_queue_by_reason(hw, | |
451 | hw->queues + sta->tid_to_tx_q[tid], | |
452 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
453 | } | |
b8695a8f | 454 | } |
96f5e66e JB |
455 | |
456 | out: | |
b8695a8f JB |
457 | spin_unlock_bh(&sta->lock); |
458 | rcu_read_unlock(); | |
459 | } | |
460 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); | |
461 | ||
86ab6c5a JB |
462 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
463 | const u8 *ra, u16 tid) | |
464 | { | |
465 | struct ieee80211_local *local = hw_to_local(hw); | |
466 | struct ieee80211_ra_tid *ra_tid; | |
467 | struct sk_buff *skb = dev_alloc_skb(0); | |
468 | ||
469 | if (unlikely(!skb)) { | |
470 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
471 | if (net_ratelimit()) | |
472 | printk(KERN_WARNING "%s: Not enough memory, " | |
473 | "dropping start BA session", skb->dev->name); | |
474 | #endif | |
475 | return; | |
476 | } | |
477 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
478 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
479 | ra_tid->tid = tid; | |
480 | ||
481 | skb->pkt_type = IEEE80211_ADDBA_MSG; | |
482 | skb_queue_tail(&local->skb_queue, skb); | |
483 | tasklet_schedule(&local->tasklet); | |
484 | } | |
485 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
486 | ||
849b7967 JB |
487 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
488 | enum ieee80211_back_parties initiator) | |
489 | { | |
490 | u8 *state; | |
491 | int ret; | |
492 | ||
493 | /* check if the TID is in aggregation */ | |
494 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
495 | spin_lock_bh(&sta->lock); | |
496 | ||
497 | if (*state != HT_AGG_STATE_OPERATIONAL) { | |
498 | ret = -ENOENT; | |
499 | goto unlock; | |
500 | } | |
501 | ||
502 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
503 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
504 | sta->sta.addr, tid); | |
505 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
506 | ||
507 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); | |
508 | ||
509 | unlock: | |
510 | spin_unlock_bh(&sta->lock); | |
511 | return ret; | |
512 | } | |
b8695a8f JB |
513 | |
514 | int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, | |
515 | u8 *ra, u16 tid, | |
516 | enum ieee80211_back_parties initiator) | |
517 | { | |
518 | struct ieee80211_local *local = hw_to_local(hw); | |
519 | struct sta_info *sta; | |
b8695a8f JB |
520 | int ret = 0; |
521 | ||
23e6a7ea JB |
522 | if (WARN_ON(!local->ops->ampdu_action)) |
523 | return -EINVAL; | |
524 | ||
b8695a8f JB |
525 | if (tid >= STA_TID_NUM) |
526 | return -EINVAL; | |
527 | ||
528 | rcu_read_lock(); | |
529 | sta = sta_info_get(local, ra); | |
530 | if (!sta) { | |
531 | rcu_read_unlock(); | |
532 | return -ENOENT; | |
533 | } | |
534 | ||
849b7967 | 535 | ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
b8695a8f JB |
536 | rcu_read_unlock(); |
537 | return ret; | |
538 | } | |
539 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
540 | ||
541 | void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) | |
542 | { | |
543 | struct ieee80211_local *local = hw_to_local(hw); | |
544 | struct sta_info *sta; | |
545 | u8 *state; | |
b8695a8f JB |
546 | |
547 | if (tid >= STA_TID_NUM) { | |
548 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
549 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
550 | tid, STA_TID_NUM); | |
551 | #endif | |
552 | return; | |
553 | } | |
554 | ||
555 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
556 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
557 | ra, tid); | |
558 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
559 | ||
560 | rcu_read_lock(); | |
561 | sta = sta_info_get(local, ra); | |
562 | if (!sta) { | |
563 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
564 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
565 | #endif | |
566 | rcu_read_unlock(); | |
567 | return; | |
568 | } | |
569 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
570 | ||
571 | /* NOTE: no need to use sta->lock in this state check, as | |
572 | * ieee80211_stop_tx_ba_session will let only one stop call to | |
573 | * pass through per sta/tid | |
574 | */ | |
575 | if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { | |
576 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
577 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
578 | #endif | |
579 | rcu_read_unlock(); | |
580 | return; | |
581 | } | |
582 | ||
583 | if (*state & HT_AGG_STATE_INITIATOR_MSK) | |
584 | ieee80211_send_delba(sta->sdata, ra, tid, | |
585 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
586 | ||
96f5e66e | 587 | spin_lock_bh(&sta->lock); |
b8695a8f | 588 | |
96f5e66e JB |
589 | if (*state & HT_AGG_STATE_INITIATOR_MSK && |
590 | hw->ampdu_queues) { | |
591 | /* | |
592 | * Wake up this queue, we stopped it earlier, | |
593 | * this will in turn wake the entire AC. | |
b8695a8f | 594 | */ |
96f5e66e JB |
595 | ieee80211_wake_queue_by_reason(hw, |
596 | hw->queues + sta->tid_to_tx_q[tid], | |
597 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
b8695a8f | 598 | } |
96f5e66e | 599 | |
b8695a8f JB |
600 | *state = HT_AGG_STATE_IDLE; |
601 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
602 | kfree(sta->ampdu_mlme.tid_tx[tid]); | |
603 | sta->ampdu_mlme.tid_tx[tid] = NULL; | |
604 | spin_unlock_bh(&sta->lock); | |
605 | ||
606 | rcu_read_unlock(); | |
607 | } | |
608 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); | |
609 | ||
b8695a8f JB |
610 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
611 | const u8 *ra, u16 tid) | |
612 | { | |
613 | struct ieee80211_local *local = hw_to_local(hw); | |
614 | struct ieee80211_ra_tid *ra_tid; | |
615 | struct sk_buff *skb = dev_alloc_skb(0); | |
616 | ||
617 | if (unlikely(!skb)) { | |
618 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
619 | if (net_ratelimit()) | |
620 | printk(KERN_WARNING "%s: Not enough memory, " | |
621 | "dropping stop BA session", skb->dev->name); | |
622 | #endif | |
623 | return; | |
624 | } | |
625 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; | |
626 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
627 | ra_tid->tid = tid; | |
628 | ||
629 | skb->pkt_type = IEEE80211_DELBA_MSG; | |
630 | skb_queue_tail(&local->skb_queue, skb); | |
631 | tasklet_schedule(&local->tasklet); | |
632 | } | |
633 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
634 | ||
86ab6c5a | 635 | |
b8695a8f JB |
636 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
637 | struct sta_info *sta, | |
638 | struct ieee80211_mgmt *mgmt, | |
639 | size_t len) | |
640 | { | |
641 | struct ieee80211_hw *hw = &local->hw; | |
642 | u16 capab; | |
643 | u16 tid, start_seq_num; | |
644 | u8 *state; | |
645 | ||
646 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
647 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
648 | ||
649 | state = &sta->ampdu_mlme.tid_state_tx[tid]; | |
650 | ||
651 | spin_lock_bh(&sta->lock); | |
652 | ||
653 | if (!(*state & HT_ADDBA_REQUESTED_MSK)) { | |
654 | spin_unlock_bh(&sta->lock); | |
655 | return; | |
656 | } | |
657 | ||
658 | if (mgmt->u.action.u.addba_resp.dialog_token != | |
659 | sta->ampdu_mlme.tid_tx[tid]->dialog_token) { | |
660 | spin_unlock_bh(&sta->lock); | |
661 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
662 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
663 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
664 | return; | |
665 | } | |
666 | ||
667 | del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); | |
668 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
669 | printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); | |
670 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
671 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) | |
672 | == WLAN_STATUS_SUCCESS) { | |
96f5e66e JB |
673 | u8 curstate = *state; |
674 | ||
b8695a8f | 675 | *state |= HT_ADDBA_RECEIVED_MSK; |
b8695a8f | 676 | |
96f5e66e JB |
677 | if (hw->ampdu_queues && *state != curstate && |
678 | *state == HT_AGG_STATE_OPERATIONAL) { | |
679 | /* | |
680 | * Wake up this queue, we stopped it earlier, | |
681 | * this will in turn wake the entire AC. | |
682 | */ | |
683 | ieee80211_wake_queue_by_reason(hw, | |
684 | hw->queues + sta->tid_to_tx_q[tid], | |
685 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
686 | } | |
687 | sta->ampdu_mlme.addba_req_num[tid] = 0; | |
b8695a8f JB |
688 | |
689 | if (local->ops->ampdu_action) { | |
690 | (void)local->ops->ampdu_action(hw, | |
691 | IEEE80211_AMPDU_TX_RESUME, | |
692 | &sta->sta, tid, &start_seq_num); | |
693 | } | |
694 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
695 | printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid); | |
696 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
b8695a8f JB |
697 | } else { |
698 | sta->ampdu_mlme.addba_req_num[tid]++; | |
849b7967 | 699 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); |
b8695a8f | 700 | } |
849b7967 | 701 | spin_unlock_bh(&sta->lock); |
b8695a8f | 702 | } |