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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 | ||
24f50a9d JB |
163 | /* if we're already stopping ignore any new requests to stop */ |
164 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
165 | spin_unlock_bh(&sta->lock); | |
166 | return -EALREADY; | |
167 | } | |
168 | ||
0ab33703 JB |
169 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
170 | /* not even started yet! */ | |
ec034b20 | 171 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 172 | spin_unlock_bh(&sta->lock); |
0744371a | 173 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
174 | return 0; |
175 | } | |
176 | ||
24f50a9d JB |
177 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
178 | ||
cfcdbde3 JB |
179 | spin_unlock_bh(&sta->lock); |
180 | ||
827d42c9 JB |
181 | #ifdef CONFIG_MAC80211_HT_DEBUG |
182 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
183 | sta->sta.addr, tid); | |
184 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
185 | ||
44271488 JB |
186 | del_timer_sync(&tid_tx->addba_resp_timer); |
187 | ||
a622ab72 JB |
188 | /* |
189 | * After this packets are no longer handed right through | |
190 | * to the driver but are put onto tid_tx->pending instead, | |
191 | * with locking to ensure proper access. | |
192 | */ | |
193 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 194 | |
a622ab72 | 195 | tid_tx->stop_initiator = initiator; |
53f73c09 | 196 | tid_tx->tx_stop = tx; |
23e6a7ea | 197 | |
12375ef9 | 198 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 199 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 200 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
201 | |
202 | /* HW shall not deny going back to legacy */ | |
203 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
204 | /* |
205 | * We may have pending packets get stuck in this case... | |
206 | * Not bothering with a workaround for now. | |
207 | */ | |
23e6a7ea JB |
208 | } |
209 | ||
210 | return ret; | |
211 | } | |
212 | ||
b8695a8f JB |
213 | /* |
214 | * After sending add Block Ack request we activated a timer until | |
215 | * add Block Ack response will arrive from the recipient. | |
216 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
217 | */ | |
218 | static void sta_addba_resp_timer_expired(unsigned long data) | |
219 | { | |
220 | /* not an elegant detour, but there is no choice as the timer passes | |
221 | * only one argument, and both sta_info and TID are needed, so init | |
222 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
223 | * array gives the sta through container_of */ | |
224 | u16 tid = *(u8 *)data; | |
23e6a7ea | 225 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 226 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 227 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 228 | |
b8695a8f | 229 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
230 | rcu_read_lock(); |
231 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
232 | if (!tid_tx || |
233 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 234 | rcu_read_unlock(); |
b8695a8f JB |
235 | #ifdef CONFIG_MAC80211_HT_DEBUG |
236 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 237 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 238 | tid); |
b8695a8f | 239 | #endif |
23e6a7ea | 240 | return; |
b8695a8f JB |
241 | } |
242 | ||
243 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
244 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
245 | #endif | |
246 | ||
83a5cbf7 JB |
247 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
248 | rcu_read_unlock(); | |
b8695a8f JB |
249 | } |
250 | ||
96f5e66e JB |
251 | static inline int ieee80211_ac_from_tid(int tid) |
252 | { | |
253 | return ieee802_1d_to_ac[tid & 7]; | |
254 | } | |
255 | ||
a6a67db2 JB |
256 | /* |
257 | * When multiple aggregation sessions on multiple stations | |
258 | * are being created/destroyed simultaneously, we need to | |
259 | * refcount the global queue stop caused by that in order | |
260 | * to not get into a situation where one of the aggregation | |
261 | * setup or teardown re-enables queues before the other is | |
262 | * ready to handle that. | |
263 | * | |
264 | * These two functions take care of this issue by keeping | |
265 | * a global "agg_queue_stop" refcount. | |
266 | */ | |
267 | static void __acquires(agg_queue) | |
268 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
269 | { | |
270 | int queue = ieee80211_ac_from_tid(tid); | |
271 | ||
272 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
273 | ieee80211_stop_queue_by_reason( | |
274 | &local->hw, queue, | |
275 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
276 | __acquire(agg_queue); | |
277 | } | |
278 | ||
279 | static void __releases(agg_queue) | |
280 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
281 | { | |
282 | int queue = ieee80211_ac_from_tid(tid); | |
283 | ||
284 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
285 | ieee80211_wake_queue_by_reason( | |
286 | &local->hw, queue, | |
287 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
288 | __release(agg_queue); | |
289 | } | |
290 | ||
67c282c0 | 291 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 292 | { |
40b275b6 | 293 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
294 | struct ieee80211_local *local = sta->local; |
295 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
296 | u16 start_seq_num; | |
297 | int ret; | |
298 | ||
40b275b6 | 299 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 300 | |
0ab33703 JB |
301 | /* |
302 | * While we're asking the driver about the aggregation, | |
303 | * stop the AC queue so that we don't have to worry | |
304 | * about frames that came in while we were doing that, | |
305 | * which would require us to put them to the AC pending | |
306 | * afterwards which just makes the code more complex. | |
307 | */ | |
308 | ieee80211_stop_queue_agg(local, tid); | |
309 | ||
310 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
311 | ||
312 | /* | |
cfcdbde3 JB |
313 | * make sure no packets are being processed to get |
314 | * valid starting sequence number | |
0ab33703 | 315 | */ |
cfcdbde3 JB |
316 | synchronize_net(); |
317 | ||
0ab33703 JB |
318 | start_seq_num = sta->tid_seq[tid] >> 4; |
319 | ||
320 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 321 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
322 | if (ret) { |
323 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
324 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
325 | " tid %d\n", tid); | |
326 | #endif | |
cfcdbde3 | 327 | spin_lock_bh(&sta->lock); |
ec034b20 | 328 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 JB |
329 | spin_unlock_bh(&sta->lock); |
330 | ||
0ab33703 | 331 | ieee80211_wake_queue_agg(local, tid); |
0744371a | 332 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
333 | return; |
334 | } | |
335 | ||
336 | /* we can take packets again now */ | |
337 | ieee80211_wake_queue_agg(local, tid); | |
338 | ||
339 | /* activate the timer for the recipient's addBA response */ | |
340 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
341 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
342 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
343 | #endif | |
344 | ||
cfcdbde3 | 345 | spin_lock_bh(&sta->lock); |
0ab33703 | 346 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 347 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
348 | |
349 | /* send AddBA request */ | |
350 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
351 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
352 | local->hw.max_tx_aggregation_subframes, |
353 | tid_tx->timeout); | |
0ab33703 JB |
354 | } |
355 | ||
bd2ce6e4 SM |
356 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
357 | u16 timeout) | |
b8695a8f | 358 | { |
c951ad35 JB |
359 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
360 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
361 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 362 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 363 | int ret = 0; |
b8695a8f | 364 | |
b5878a2d JB |
365 | trace_api_start_tx_ba_session(pubsta, tid); |
366 | ||
23e6a7ea JB |
367 | if (WARN_ON(!local->ops->ampdu_action)) |
368 | return -EINVAL; | |
369 | ||
c951ad35 | 370 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
371 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
372 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
373 | return -EINVAL; |
374 | ||
375 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
376 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 377 | pubsta->addr, tid); |
b8695a8f JB |
378 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
379 | ||
8abd3f9b JB |
380 | /* |
381 | * The aggregation code is not prepared to handle | |
382 | * anything but STA/AP due to the BSSID handling. | |
383 | * IBSS could work in the code but isn't supported | |
384 | * by drivers or the standard. | |
385 | */ | |
c951ad35 JB |
386 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
387 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
388 | sdata->vif.type != NL80211_IFTYPE_AP) | |
389 | return -EINVAL; | |
8abd3f9b | 390 | |
c2c98fde | 391 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 392 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 393 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
394 | "Denying BA session request\n"); |
395 | #endif | |
c951ad35 | 396 | return -EINVAL; |
722f069a S |
397 | } |
398 | ||
b8695a8f JB |
399 | spin_lock_bh(&sta->lock); |
400 | ||
401 | /* we have tried too many times, receiver does not want A-MPDU */ | |
402 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
403 | ret = -EBUSY; | |
404 | goto err_unlock_sta; | |
405 | } | |
406 | ||
40b275b6 | 407 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 408 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 409 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
410 | #ifdef CONFIG_MAC80211_HT_DEBUG |
411 | printk(KERN_DEBUG "BA request denied - session is not " | |
412 | "idle on tid %u\n", tid); | |
413 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
414 | ret = -EAGAIN; | |
415 | goto err_unlock_sta; | |
416 | } | |
417 | ||
418 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
419 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
420 | if (!tid_tx) { | |
b8695a8f | 421 | ret = -ENOMEM; |
0ab33703 | 422 | goto err_unlock_sta; |
b8695a8f | 423 | } |
96f5e66e | 424 | |
a622ab72 | 425 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 426 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 427 | |
bd2ce6e4 SM |
428 | tid_tx->timeout = timeout; |
429 | ||
b8695a8f | 430 | /* Tx timer */ |
a622ab72 JB |
431 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
432 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
433 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 434 | |
0ab33703 | 435 | /* assign a dialog token */ |
b8695a8f | 436 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 437 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 438 | |
ec034b20 JB |
439 | /* |
440 | * Finally, assign it to the start array; the work item will | |
441 | * collect it and move it to the normal array. | |
442 | */ | |
443 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 444 | |
0ab33703 | 445 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 446 | |
0ab33703 | 447 | /* this flow continues off the work */ |
96f5e66e | 448 | err_unlock_sta: |
b8695a8f | 449 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
450 | return ret; |
451 | } | |
452 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
453 | ||
cd8ffc80 JB |
454 | /* |
455 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 456 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 457 | */ |
a6a67db2 JB |
458 | static void __acquires(agg_queue) |
459 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
460 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 461 | { |
a6a67db2 | 462 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 463 | unsigned long flags; |
cd8ffc80 | 464 | |
a6a67db2 | 465 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 466 | |
a622ab72 JB |
467 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
468 | " from the pending queue\n", tid)) | |
416fbdff LR |
469 | return; |
470 | ||
a622ab72 | 471 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 472 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 473 | /* copy over remaining packets */ |
a622ab72 JB |
474 | skb_queue_splice_tail_init(&tid_tx->pending, |
475 | &local->pending[queue]); | |
cd8ffc80 JB |
476 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
477 | } | |
478 | } | |
479 | ||
a6a67db2 JB |
480 | static void __releases(agg_queue) |
481 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 482 | { |
a6a67db2 | 483 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
484 | } |
485 | ||
b1720231 JB |
486 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
487 | struct sta_info *sta, u16 tid) | |
488 | { | |
40b275b6 JB |
489 | struct tid_ampdu_tx *tid_tx; |
490 | ||
cfcdbde3 | 491 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 492 | |
40b275b6 JB |
493 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
494 | ||
b1720231 | 495 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 496 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
497 | #endif |
498 | ||
cfcdbde3 JB |
499 | drv_ampdu_action(local, sta->sdata, |
500 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 501 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
502 | |
503 | /* | |
504 | * synchronize with TX path, while splicing the TX path | |
505 | * should block so it won't put more packets onto pending. | |
506 | */ | |
507 | spin_lock_bh(&sta->lock); | |
508 | ||
40b275b6 | 509 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 510 | /* |
a622ab72 JB |
511 | * Now mark as operational. This will be visible |
512 | * in the TX path, and lets it go lock-free in | |
513 | * the common case. | |
cd8ffc80 | 514 | */ |
40b275b6 | 515 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 516 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 517 | |
cfcdbde3 | 518 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
519 | } |
520 | ||
c951ad35 | 521 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 522 | { |
c951ad35 JB |
523 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
524 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 525 | struct sta_info *sta; |
a622ab72 | 526 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 527 | |
b5878a2d JB |
528 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
529 | ||
b8695a8f JB |
530 | if (tid >= STA_TID_NUM) { |
531 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
532 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
533 | tid, STA_TID_NUM); | |
534 | #endif | |
535 | return; | |
536 | } | |
537 | ||
cfcdbde3 | 538 | mutex_lock(&local->sta_mtx); |
abe60632 | 539 | sta = sta_info_get(sdata, ra); |
b8695a8f | 540 | if (!sta) { |
cfcdbde3 | 541 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
542 | #ifdef CONFIG_MAC80211_HT_DEBUG |
543 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
544 | #endif | |
545 | return; | |
546 | } | |
547 | ||
cfcdbde3 | 548 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 549 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 550 | |
a622ab72 | 551 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 552 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 553 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 554 | #endif |
cfcdbde3 | 555 | goto unlock; |
b8695a8f JB |
556 | } |
557 | ||
a622ab72 | 558 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 559 | goto unlock; |
b8695a8f | 560 | |
a622ab72 | 561 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 562 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 563 | |
cfcdbde3 JB |
564 | unlock: |
565 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
566 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 567 | } |
b8695a8f | 568 | |
c951ad35 | 569 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
570 | const u8 *ra, u16 tid) |
571 | { | |
c951ad35 JB |
572 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
573 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
574 | struct ieee80211_ra_tid *ra_tid; |
575 | struct sk_buff *skb = dev_alloc_skb(0); | |
576 | ||
d15b8459 | 577 | if (unlikely(!skb)) |
86ab6c5a | 578 | return; |
d15b8459 | 579 | |
86ab6c5a JB |
580 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
581 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
582 | ra_tid->tid = tid; | |
583 | ||
c1475ca9 JB |
584 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
585 | skb_queue_tail(&sdata->skb_queue, skb); | |
586 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
587 | } |
588 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
589 | ||
849b7967 | 590 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
591 | enum ieee80211_back_parties initiator, |
592 | bool tx) | |
849b7967 | 593 | { |
849b7967 JB |
594 | int ret; |
595 | ||
cfcdbde3 | 596 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 597 | |
53f73c09 | 598 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 599 | |
cfcdbde3 JB |
600 | mutex_unlock(&sta->ampdu_mlme.mtx); |
601 | ||
849b7967 JB |
602 | return ret; |
603 | } | |
b8695a8f | 604 | |
6a8579d0 | 605 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 606 | { |
c951ad35 JB |
607 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
608 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
609 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
610 | struct tid_ampdu_tx *tid_tx; |
611 | int ret = 0; | |
b8695a8f | 612 | |
6a8579d0 | 613 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 614 | |
4253119a | 615 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
616 | return -EINVAL; |
617 | ||
b8695a8f JB |
618 | if (tid >= STA_TID_NUM) |
619 | return -EINVAL; | |
620 | ||
0ab33703 | 621 | spin_lock_bh(&sta->lock); |
40b275b6 | 622 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
623 | |
624 | if (!tid_tx) { | |
625 | ret = -ENOENT; | |
626 | goto unlock; | |
627 | } | |
628 | ||
629 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
630 | /* already in progress stopping it */ | |
631 | ret = 0; | |
632 | goto unlock; | |
633 | } | |
634 | ||
635 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
636 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
637 | ||
638 | unlock: | |
639 | spin_unlock_bh(&sta->lock); | |
640 | return ret; | |
b8695a8f JB |
641 | } |
642 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
643 | ||
c951ad35 | 644 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 645 | { |
c951ad35 JB |
646 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
647 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 648 | struct sta_info *sta; |
a622ab72 | 649 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 650 | |
b5878a2d JB |
651 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
652 | ||
b8695a8f JB |
653 | if (tid >= STA_TID_NUM) { |
654 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
655 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
656 | tid, STA_TID_NUM); | |
657 | #endif | |
658 | return; | |
659 | } | |
660 | ||
661 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
662 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
663 | ra, tid); | |
664 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
665 | ||
cfcdbde3 JB |
666 | mutex_lock(&local->sta_mtx); |
667 | ||
abe60632 | 668 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
669 | if (!sta) { |
670 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
671 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
672 | #endif | |
cfcdbde3 | 673 | goto unlock; |
b8695a8f | 674 | } |
b8695a8f | 675 | |
cfcdbde3 | 676 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 677 | spin_lock_bh(&sta->lock); |
40b275b6 | 678 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
679 | |
680 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
681 | #ifdef CONFIG_MAC80211_HT_DEBUG |
682 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
683 | #endif | |
cfcdbde3 | 684 | goto unlock_sta; |
b8695a8f JB |
685 | } |
686 | ||
53f73c09 | 687 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
688 | ieee80211_send_delba(sta->sdata, ra, tid, |
689 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
690 | ||
a622ab72 JB |
691 | /* |
692 | * When we get here, the TX path will not be lockless any more wrt. | |
693 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
694 | * Thus it will block on getting the lock, if it occurs. So if we | |
695 | * stop the queue now, we will not get any more packets, and any | |
696 | * that might be being processed will wait for us here, thereby | |
697 | * guaranteeing that no packets go to the tid_tx pending queue any | |
698 | * more. | |
699 | */ | |
b8695a8f | 700 | |
a622ab72 | 701 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 702 | |
a622ab72 | 703 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 704 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 705 | |
a622ab72 | 706 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 707 | |
0744371a | 708 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 709 | |
cfcdbde3 | 710 | unlock_sta: |
a622ab72 | 711 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
712 | mutex_unlock(&sta->ampdu_mlme.mtx); |
713 | unlock: | |
714 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 715 | } |
b8695a8f | 716 | |
c951ad35 | 717 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
718 | const u8 *ra, u16 tid) |
719 | { | |
c951ad35 JB |
720 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
721 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
722 | struct ieee80211_ra_tid *ra_tid; |
723 | struct sk_buff *skb = dev_alloc_skb(0); | |
724 | ||
d15b8459 | 725 | if (unlikely(!skb)) |
b8695a8f | 726 | return; |
d15b8459 | 727 | |
b8695a8f JB |
728 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
729 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
730 | ra_tid->tid = tid; | |
731 | ||
c1475ca9 JB |
732 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
733 | skb_queue_tail(&sdata->skb_queue, skb); | |
734 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
735 | } |
736 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
737 | ||
86ab6c5a | 738 | |
b8695a8f JB |
739 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
740 | struct sta_info *sta, | |
741 | struct ieee80211_mgmt *mgmt, | |
742 | size_t len) | |
743 | { | |
a622ab72 | 744 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 745 | u16 capab, tid; |
0b01f030 | 746 | u8 buf_size; |
b8695a8f JB |
747 | |
748 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
749 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 750 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 751 | |
cfcdbde3 | 752 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 753 | |
40b275b6 | 754 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 755 | if (!tid_tx) |
8ade0082 | 756 | goto out; |
b8695a8f | 757 | |
a622ab72 | 758 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
759 | #ifdef CONFIG_MAC80211_HT_DEBUG |
760 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 761 | #endif |
8ade0082 | 762 | goto out; |
b8695a8f JB |
763 | } |
764 | ||
a622ab72 | 765 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 766 | |
b8695a8f | 767 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 768 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 769 | #endif |
3ca97880 HS |
770 | /* |
771 | * IEEE 802.11-2007 7.3.1.14: | |
772 | * In an ADDBA Response frame, when the Status Code field | |
773 | * is set to 0, the Buffer Size subfield is set to a value | |
774 | * of at least 1. | |
775 | */ | |
b8695a8f | 776 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 777 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
778 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
779 | &tid_tx->state)) { | |
780 | /* ignore duplicate response */ | |
781 | goto out; | |
782 | } | |
b8695a8f | 783 | |
0b01f030 JB |
784 | tid_tx->buf_size = buf_size; |
785 | ||
a622ab72 | 786 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 787 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 788 | |
b1720231 | 789 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 790 | } else { |
53f73c09 JB |
791 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
792 | true); | |
b8695a8f | 793 | } |
2171abc5 | 794 | |
2171abc5 | 795 | out: |
cfcdbde3 | 796 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 797 | } |