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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> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
b8695a8f JB |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
b8695a8f JB |
18 | #include <net/mac80211.h> |
19 | #include "ieee80211_i.h" | |
24487981 | 20 | #include "driver-ops.h" |
b8695a8f JB |
21 | #include "wme.h" |
22 | ||
86ab6c5a | 23 | /** |
73a72a81 | 24 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
25 | * |
26 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
27 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
28 | * packets with a flag indicating A-MPDU aggregation. The driver | |
29 | * or device is responsible for actually aggregating the frames, | |
30 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 31 | * |
73a72a81 JB |
32 | * When TX aggregation is started by some subsystem (usually the rate |
33 | * control algorithm would be appropriate) by calling the | |
34 | * ieee80211_start_tx_ba_session() function, the driver will be | |
35 | * notified via its @ampdu_action function, with the | |
36 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
37 | * |
38 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
39 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
40 | * start the aggregation session after the peer has also responded. | |
41 | * If the peer responds negatively, the session will be stopped | |
42 | * again right away. Note that it is possible for the aggregation | |
43 | * session to be stopped before the driver has indicated that it | |
44 | * is done setting it up, in which case it must not indicate the | |
45 | * setup completion. | |
86ab6c5a | 46 | * |
73a72a81 JB |
47 | * Also note that, since we also need to wait for a response from |
48 | * the peer, the driver is notified of the completion of the | |
49 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
50 | * @ampdu_action callback. | |
51 | * | |
52 | * Similarly, when the aggregation session is stopped by the peer | |
53 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
54 | * @ampdu_action function will be called with the action | |
55 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
56 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
86ab6c5a JB |
57 | */ |
58 | ||
b8695a8f JB |
59 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
60 | const u8 *da, u16 tid, | |
61 | u8 dialog_token, u16 start_seq_num, | |
62 | u16 agg_size, u16 timeout) | |
63 | { | |
64 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
65 | struct sk_buff *skb; |
66 | struct ieee80211_mgmt *mgmt; | |
67 | u16 capab; | |
68 | ||
69 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
70 | ||
d15b8459 | 71 | if (!skb) |
b8695a8f | 72 | return; |
d15b8459 | 73 | |
b8695a8f JB |
74 | skb_reserve(skb, local->hw.extra_tx_headroom); |
75 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
76 | memset(mgmt, 0, 24); | |
77 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 78 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
79 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
80 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 81 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
82 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
83 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
84 | |
85 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
86 | IEEE80211_STYPE_ACTION); | |
87 | ||
88 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
89 | ||
90 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
91 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
92 | ||
93 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
94 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
95 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
96 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
97 | ||
98 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
99 | ||
100 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
101 | mgmt->u.action.u.addba_req.start_seq_num = | |
102 | cpu_to_le16(start_seq_num << 4); | |
103 | ||
62ae67be | 104 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
105 | } |
106 | ||
8c771244 | 107 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 108 | { |
8c771244 | 109 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
110 | struct ieee80211_local *local = sdata->local; |
111 | struct sk_buff *skb; | |
112 | struct ieee80211_bar *bar; | |
113 | u16 bar_control = 0; | |
114 | ||
115 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 116 | if (!skb) |
b8695a8f | 117 | return; |
d15b8459 | 118 | |
b8695a8f JB |
119 | skb_reserve(skb, local->hw.extra_tx_headroom); |
120 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
121 | memset(bar, 0, sizeof(*bar)); | |
122 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
123 | IEEE80211_STYPE_BACK_REQ); | |
124 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 125 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
126 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
127 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 128 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
129 | bar->control = cpu_to_le16(bar_control); |
130 | bar->start_seq_num = cpu_to_le16(ssn); | |
131 | ||
62ae67be JB |
132 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
133 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f | 134 | } |
8c771244 | 135 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 136 | |
ec034b20 JB |
137 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
138 | struct tid_ampdu_tx *tid_tx) | |
139 | { | |
140 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
141 | lockdep_assert_held(&sta->lock); | |
142 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
143 | } | |
144 | ||
67c282c0 | 145 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
146 | enum ieee80211_back_parties initiator, |
147 | bool tx) | |
23e6a7ea | 148 | { |
849b7967 | 149 | struct ieee80211_local *local = sta->local; |
40b275b6 | 150 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 151 | int ret; |
a622ab72 | 152 | |
cfcdbde3 | 153 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 154 | |
cfcdbde3 JB |
155 | spin_lock_bh(&sta->lock); |
156 | ||
40b275b6 JB |
157 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
158 | if (!tid_tx) { | |
159 | spin_unlock_bh(&sta->lock); | |
160 | return -ENOENT; | |
161 | } | |
162 | ||
0ab33703 JB |
163 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
164 | /* not even started yet! */ | |
ec034b20 | 165 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 166 | spin_unlock_bh(&sta->lock); |
0744371a | 167 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
168 | return 0; |
169 | } | |
170 | ||
cfcdbde3 JB |
171 | spin_unlock_bh(&sta->lock); |
172 | ||
827d42c9 JB |
173 | #ifdef CONFIG_MAC80211_HT_DEBUG |
174 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
175 | sta->sta.addr, tid); | |
176 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
177 | ||
a622ab72 | 178 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 179 | |
44271488 JB |
180 | del_timer_sync(&tid_tx->addba_resp_timer); |
181 | ||
a622ab72 JB |
182 | /* |
183 | * After this packets are no longer handed right through | |
184 | * to the driver but are put onto tid_tx->pending instead, | |
185 | * with locking to ensure proper access. | |
186 | */ | |
187 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 188 | |
a622ab72 | 189 | tid_tx->stop_initiator = initiator; |
53f73c09 | 190 | tid_tx->tx_stop = tx; |
23e6a7ea | 191 | |
12375ef9 | 192 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 193 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 194 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
195 | |
196 | /* HW shall not deny going back to legacy */ | |
197 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
198 | /* |
199 | * We may have pending packets get stuck in this case... | |
200 | * Not bothering with a workaround for now. | |
201 | */ | |
23e6a7ea JB |
202 | } |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
b8695a8f JB |
207 | /* |
208 | * After sending add Block Ack request we activated a timer until | |
209 | * add Block Ack response will arrive from the recipient. | |
210 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
211 | */ | |
212 | static void sta_addba_resp_timer_expired(unsigned long data) | |
213 | { | |
214 | /* not an elegant detour, but there is no choice as the timer passes | |
215 | * only one argument, and both sta_info and TID are needed, so init | |
216 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
217 | * array gives the sta through container_of */ | |
218 | u16 tid = *(u8 *)data; | |
23e6a7ea | 219 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 220 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 221 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 222 | |
b8695a8f | 223 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
224 | rcu_read_lock(); |
225 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
226 | if (!tid_tx || |
227 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 228 | rcu_read_unlock(); |
b8695a8f JB |
229 | #ifdef CONFIG_MAC80211_HT_DEBUG |
230 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 231 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 232 | tid); |
b8695a8f | 233 | #endif |
23e6a7ea | 234 | return; |
b8695a8f JB |
235 | } |
236 | ||
237 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
238 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
239 | #endif | |
240 | ||
83a5cbf7 JB |
241 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
242 | rcu_read_unlock(); | |
b8695a8f JB |
243 | } |
244 | ||
96f5e66e JB |
245 | static inline int ieee80211_ac_from_tid(int tid) |
246 | { | |
247 | return ieee802_1d_to_ac[tid & 7]; | |
248 | } | |
249 | ||
a6a67db2 JB |
250 | /* |
251 | * When multiple aggregation sessions on multiple stations | |
252 | * are being created/destroyed simultaneously, we need to | |
253 | * refcount the global queue stop caused by that in order | |
254 | * to not get into a situation where one of the aggregation | |
255 | * setup or teardown re-enables queues before the other is | |
256 | * ready to handle that. | |
257 | * | |
258 | * These two functions take care of this issue by keeping | |
259 | * a global "agg_queue_stop" refcount. | |
260 | */ | |
261 | static void __acquires(agg_queue) | |
262 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
263 | { | |
264 | int queue = ieee80211_ac_from_tid(tid); | |
265 | ||
266 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
267 | ieee80211_stop_queue_by_reason( | |
268 | &local->hw, queue, | |
269 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
270 | __acquire(agg_queue); | |
271 | } | |
272 | ||
273 | static void __releases(agg_queue) | |
274 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
275 | { | |
276 | int queue = ieee80211_ac_from_tid(tid); | |
277 | ||
278 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
279 | ieee80211_wake_queue_by_reason( | |
280 | &local->hw, queue, | |
281 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
282 | __release(agg_queue); | |
283 | } | |
284 | ||
67c282c0 | 285 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 286 | { |
40b275b6 | 287 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
288 | struct ieee80211_local *local = sta->local; |
289 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
290 | u16 start_seq_num; | |
291 | int ret; | |
292 | ||
40b275b6 | 293 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 294 | |
0ab33703 JB |
295 | /* |
296 | * While we're asking the driver about the aggregation, | |
297 | * stop the AC queue so that we don't have to worry | |
298 | * about frames that came in while we were doing that, | |
299 | * which would require us to put them to the AC pending | |
300 | * afterwards which just makes the code more complex. | |
301 | */ | |
302 | ieee80211_stop_queue_agg(local, tid); | |
303 | ||
304 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
305 | ||
306 | /* | |
cfcdbde3 JB |
307 | * make sure no packets are being processed to get |
308 | * valid starting sequence number | |
0ab33703 | 309 | */ |
cfcdbde3 JB |
310 | synchronize_net(); |
311 | ||
0ab33703 JB |
312 | start_seq_num = sta->tid_seq[tid] >> 4; |
313 | ||
314 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 315 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
316 | if (ret) { |
317 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
318 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
319 | " tid %d\n", tid); | |
320 | #endif | |
cfcdbde3 | 321 | spin_lock_bh(&sta->lock); |
ec034b20 | 322 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 JB |
323 | spin_unlock_bh(&sta->lock); |
324 | ||
0ab33703 | 325 | ieee80211_wake_queue_agg(local, tid); |
0744371a | 326 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
327 | return; |
328 | } | |
329 | ||
330 | /* we can take packets again now */ | |
331 | ieee80211_wake_queue_agg(local, tid); | |
332 | ||
333 | /* activate the timer for the recipient's addBA response */ | |
334 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
335 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
336 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
337 | #endif | |
338 | ||
cfcdbde3 | 339 | spin_lock_bh(&sta->lock); |
0ab33703 | 340 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 341 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
342 | |
343 | /* send AddBA request */ | |
344 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
345 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
346 | local->hw.max_tx_aggregation_subframes, |
347 | tid_tx->timeout); | |
0ab33703 JB |
348 | } |
349 | ||
bd2ce6e4 SM |
350 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
351 | u16 timeout) | |
b8695a8f | 352 | { |
c951ad35 JB |
353 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
354 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
355 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 356 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 357 | int ret = 0; |
b8695a8f | 358 | |
b5878a2d JB |
359 | trace_api_start_tx_ba_session(pubsta, tid); |
360 | ||
23e6a7ea JB |
361 | if (WARN_ON(!local->ops->ampdu_action)) |
362 | return -EINVAL; | |
363 | ||
c951ad35 | 364 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
365 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
366 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
367 | return -EINVAL; |
368 | ||
369 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
370 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 371 | pubsta->addr, tid); |
b8695a8f JB |
372 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
373 | ||
8abd3f9b JB |
374 | /* |
375 | * The aggregation code is not prepared to handle | |
376 | * anything but STA/AP due to the BSSID handling. | |
377 | * IBSS could work in the code but isn't supported | |
378 | * by drivers or the standard. | |
379 | */ | |
c951ad35 JB |
380 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
381 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
382 | sdata->vif.type != NL80211_IFTYPE_AP) | |
383 | return -EINVAL; | |
8abd3f9b | 384 | |
c2c98fde | 385 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 386 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 387 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
388 | "Denying BA session request\n"); |
389 | #endif | |
c951ad35 | 390 | return -EINVAL; |
722f069a S |
391 | } |
392 | ||
b8695a8f JB |
393 | spin_lock_bh(&sta->lock); |
394 | ||
395 | /* we have tried too many times, receiver does not want A-MPDU */ | |
396 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
397 | ret = -EBUSY; | |
398 | goto err_unlock_sta; | |
399 | } | |
400 | ||
40b275b6 | 401 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 402 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 403 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
404 | #ifdef CONFIG_MAC80211_HT_DEBUG |
405 | printk(KERN_DEBUG "BA request denied - session is not " | |
406 | "idle on tid %u\n", tid); | |
407 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
408 | ret = -EAGAIN; | |
409 | goto err_unlock_sta; | |
410 | } | |
411 | ||
412 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
413 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
414 | if (!tid_tx) { | |
b8695a8f | 415 | ret = -ENOMEM; |
0ab33703 | 416 | goto err_unlock_sta; |
b8695a8f | 417 | } |
96f5e66e | 418 | |
a622ab72 | 419 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 420 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 421 | |
bd2ce6e4 SM |
422 | tid_tx->timeout = timeout; |
423 | ||
b8695a8f | 424 | /* Tx timer */ |
a622ab72 JB |
425 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
426 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
427 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 428 | |
0ab33703 | 429 | /* assign a dialog token */ |
b8695a8f | 430 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 431 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 432 | |
ec034b20 JB |
433 | /* |
434 | * Finally, assign it to the start array; the work item will | |
435 | * collect it and move it to the normal array. | |
436 | */ | |
437 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 438 | |
0ab33703 | 439 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 440 | |
0ab33703 | 441 | /* this flow continues off the work */ |
96f5e66e | 442 | err_unlock_sta: |
b8695a8f | 443 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
444 | return ret; |
445 | } | |
446 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
447 | ||
cd8ffc80 JB |
448 | /* |
449 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 450 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 451 | */ |
a6a67db2 JB |
452 | static void __acquires(agg_queue) |
453 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
454 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 455 | { |
a6a67db2 | 456 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 457 | unsigned long flags; |
cd8ffc80 | 458 | |
a6a67db2 | 459 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 460 | |
a622ab72 JB |
461 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
462 | " from the pending queue\n", tid)) | |
416fbdff LR |
463 | return; |
464 | ||
a622ab72 | 465 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 466 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 467 | /* copy over remaining packets */ |
a622ab72 JB |
468 | skb_queue_splice_tail_init(&tid_tx->pending, |
469 | &local->pending[queue]); | |
cd8ffc80 JB |
470 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
471 | } | |
472 | } | |
473 | ||
a6a67db2 JB |
474 | static void __releases(agg_queue) |
475 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 476 | { |
a6a67db2 | 477 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
478 | } |
479 | ||
b1720231 JB |
480 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
481 | struct sta_info *sta, u16 tid) | |
482 | { | |
40b275b6 JB |
483 | struct tid_ampdu_tx *tid_tx; |
484 | ||
cfcdbde3 | 485 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 486 | |
40b275b6 JB |
487 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
488 | ||
b1720231 | 489 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 490 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
491 | #endif |
492 | ||
cfcdbde3 JB |
493 | drv_ampdu_action(local, sta->sdata, |
494 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 495 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
496 | |
497 | /* | |
498 | * synchronize with TX path, while splicing the TX path | |
499 | * should block so it won't put more packets onto pending. | |
500 | */ | |
501 | spin_lock_bh(&sta->lock); | |
502 | ||
40b275b6 | 503 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 504 | /* |
a622ab72 JB |
505 | * Now mark as operational. This will be visible |
506 | * in the TX path, and lets it go lock-free in | |
507 | * the common case. | |
cd8ffc80 | 508 | */ |
40b275b6 | 509 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 510 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 511 | |
cfcdbde3 | 512 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
513 | } |
514 | ||
c951ad35 | 515 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 516 | { |
c951ad35 JB |
517 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
518 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 519 | struct sta_info *sta; |
a622ab72 | 520 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 521 | |
b5878a2d JB |
522 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
523 | ||
b8695a8f JB |
524 | if (tid >= STA_TID_NUM) { |
525 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
526 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
527 | tid, STA_TID_NUM); | |
528 | #endif | |
529 | return; | |
530 | } | |
531 | ||
cfcdbde3 | 532 | mutex_lock(&local->sta_mtx); |
abe60632 | 533 | sta = sta_info_get(sdata, ra); |
b8695a8f | 534 | if (!sta) { |
cfcdbde3 | 535 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
536 | #ifdef CONFIG_MAC80211_HT_DEBUG |
537 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
538 | #endif | |
539 | return; | |
540 | } | |
541 | ||
cfcdbde3 | 542 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 543 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 544 | |
a622ab72 | 545 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 546 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 547 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 548 | #endif |
cfcdbde3 | 549 | goto unlock; |
b8695a8f JB |
550 | } |
551 | ||
a622ab72 | 552 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 553 | goto unlock; |
b8695a8f | 554 | |
a622ab72 | 555 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 556 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 557 | |
cfcdbde3 JB |
558 | unlock: |
559 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
560 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 561 | } |
b8695a8f | 562 | |
c951ad35 | 563 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
564 | const u8 *ra, u16 tid) |
565 | { | |
c951ad35 JB |
566 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
567 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
568 | struct ieee80211_ra_tid *ra_tid; |
569 | struct sk_buff *skb = dev_alloc_skb(0); | |
570 | ||
d15b8459 | 571 | if (unlikely(!skb)) |
86ab6c5a | 572 | return; |
d15b8459 | 573 | |
86ab6c5a JB |
574 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
575 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
576 | ra_tid->tid = tid; | |
577 | ||
c1475ca9 JB |
578 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
579 | skb_queue_tail(&sdata->skb_queue, skb); | |
580 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
581 | } |
582 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
583 | ||
849b7967 | 584 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
585 | enum ieee80211_back_parties initiator, |
586 | bool tx) | |
849b7967 | 587 | { |
849b7967 JB |
588 | int ret; |
589 | ||
cfcdbde3 | 590 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 591 | |
53f73c09 | 592 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 593 | |
cfcdbde3 JB |
594 | mutex_unlock(&sta->ampdu_mlme.mtx); |
595 | ||
849b7967 JB |
596 | return ret; |
597 | } | |
b8695a8f | 598 | |
6a8579d0 | 599 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 600 | { |
c951ad35 JB |
601 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
602 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
603 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
604 | struct tid_ampdu_tx *tid_tx; |
605 | int ret = 0; | |
b8695a8f | 606 | |
6a8579d0 | 607 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 608 | |
4253119a | 609 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
610 | return -EINVAL; |
611 | ||
b8695a8f JB |
612 | if (tid >= STA_TID_NUM) |
613 | return -EINVAL; | |
614 | ||
0ab33703 | 615 | spin_lock_bh(&sta->lock); |
40b275b6 | 616 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
617 | |
618 | if (!tid_tx) { | |
619 | ret = -ENOENT; | |
620 | goto unlock; | |
621 | } | |
622 | ||
623 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
624 | /* already in progress stopping it */ | |
625 | ret = 0; | |
626 | goto unlock; | |
627 | } | |
628 | ||
629 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
630 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
631 | ||
632 | unlock: | |
633 | spin_unlock_bh(&sta->lock); | |
634 | return ret; | |
b8695a8f JB |
635 | } |
636 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
637 | ||
c951ad35 | 638 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 639 | { |
c951ad35 JB |
640 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
641 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 642 | struct sta_info *sta; |
a622ab72 | 643 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 644 | |
b5878a2d JB |
645 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
646 | ||
b8695a8f JB |
647 | if (tid >= STA_TID_NUM) { |
648 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
649 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
650 | tid, STA_TID_NUM); | |
651 | #endif | |
652 | return; | |
653 | } | |
654 | ||
655 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
656 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
657 | ra, tid); | |
658 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
659 | ||
cfcdbde3 JB |
660 | mutex_lock(&local->sta_mtx); |
661 | ||
abe60632 | 662 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
663 | if (!sta) { |
664 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
665 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
666 | #endif | |
cfcdbde3 | 667 | goto unlock; |
b8695a8f | 668 | } |
b8695a8f | 669 | |
cfcdbde3 | 670 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 671 | spin_lock_bh(&sta->lock); |
40b275b6 | 672 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
673 | |
674 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
675 | #ifdef CONFIG_MAC80211_HT_DEBUG |
676 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
677 | #endif | |
cfcdbde3 | 678 | goto unlock_sta; |
b8695a8f JB |
679 | } |
680 | ||
53f73c09 | 681 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
682 | ieee80211_send_delba(sta->sdata, ra, tid, |
683 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
684 | ||
a622ab72 JB |
685 | /* |
686 | * When we get here, the TX path will not be lockless any more wrt. | |
687 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
688 | * Thus it will block on getting the lock, if it occurs. So if we | |
689 | * stop the queue now, we will not get any more packets, and any | |
690 | * that might be being processed will wait for us here, thereby | |
691 | * guaranteeing that no packets go to the tid_tx pending queue any | |
692 | * more. | |
693 | */ | |
b8695a8f | 694 | |
a622ab72 | 695 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 696 | |
a622ab72 | 697 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 698 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 699 | |
a622ab72 | 700 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 701 | |
0744371a | 702 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 703 | |
cfcdbde3 | 704 | unlock_sta: |
a622ab72 | 705 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
706 | mutex_unlock(&sta->ampdu_mlme.mtx); |
707 | unlock: | |
708 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 709 | } |
b8695a8f | 710 | |
c951ad35 | 711 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
712 | const u8 *ra, u16 tid) |
713 | { | |
c951ad35 JB |
714 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
715 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
716 | struct ieee80211_ra_tid *ra_tid; |
717 | struct sk_buff *skb = dev_alloc_skb(0); | |
718 | ||
d15b8459 | 719 | if (unlikely(!skb)) |
b8695a8f | 720 | return; |
d15b8459 | 721 | |
b8695a8f JB |
722 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
723 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
724 | ra_tid->tid = tid; | |
725 | ||
c1475ca9 JB |
726 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
727 | skb_queue_tail(&sdata->skb_queue, skb); | |
728 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
729 | } |
730 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
731 | ||
86ab6c5a | 732 | |
b8695a8f JB |
733 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
734 | struct sta_info *sta, | |
735 | struct ieee80211_mgmt *mgmt, | |
736 | size_t len) | |
737 | { | |
a622ab72 | 738 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 739 | u16 capab, tid; |
0b01f030 | 740 | u8 buf_size; |
b8695a8f JB |
741 | |
742 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
743 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 744 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 745 | |
cfcdbde3 | 746 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 747 | |
40b275b6 | 748 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 749 | if (!tid_tx) |
8ade0082 | 750 | goto out; |
b8695a8f | 751 | |
a622ab72 | 752 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
753 | #ifdef CONFIG_MAC80211_HT_DEBUG |
754 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 755 | #endif |
8ade0082 | 756 | goto out; |
b8695a8f JB |
757 | } |
758 | ||
a622ab72 | 759 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 760 | |
b8695a8f | 761 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 762 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 763 | #endif |
3ca97880 HS |
764 | /* |
765 | * IEEE 802.11-2007 7.3.1.14: | |
766 | * In an ADDBA Response frame, when the Status Code field | |
767 | * is set to 0, the Buffer Size subfield is set to a value | |
768 | * of at least 1. | |
769 | */ | |
b8695a8f | 770 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 771 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
772 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
773 | &tid_tx->state)) { | |
774 | /* ignore duplicate response */ | |
775 | goto out; | |
776 | } | |
b8695a8f | 777 | |
0b01f030 JB |
778 | tid_tx->buf_size = buf_size; |
779 | ||
a622ab72 | 780 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 781 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 782 | |
b1720231 | 783 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 784 | } else { |
53f73c09 JB |
785 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
786 | true); | |
b8695a8f | 787 | } |
2171abc5 | 788 | |
2171abc5 | 789 | out: |
cfcdbde3 | 790 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 791 | } |