Commit | Line | Data |
---|---|---|
b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
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> |
bc3b2d7f | 18 | #include <linux/export.h> |
b8695a8f JB |
19 | #include <net/mac80211.h> |
20 | #include "ieee80211_i.h" | |
24487981 | 21 | #include "driver-ops.h" |
b8695a8f JB |
22 | #include "wme.h" |
23 | ||
86ab6c5a | 24 | /** |
73a72a81 | 25 | * DOC: TX A-MPDU aggregation |
86ab6c5a JB |
26 | * |
27 | * Aggregation on the TX side requires setting the hardware flag | |
73a72a81 JB |
28 | * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
29 | * packets with a flag indicating A-MPDU aggregation. The driver | |
30 | * or device is responsible for actually aggregating the frames, | |
31 | * as well as deciding how many and which to aggregate. | |
86ab6c5a | 32 | * |
73a72a81 JB |
33 | * When TX aggregation is started by some subsystem (usually the rate |
34 | * control algorithm would be appropriate) by calling the | |
35 | * ieee80211_start_tx_ba_session() function, the driver will be | |
36 | * notified via its @ampdu_action function, with the | |
37 | * %IEEE80211_AMPDU_TX_START action. | |
86ab6c5a JB |
38 | * |
39 | * In response to that, the driver is later required to call the | |
73a72a81 JB |
40 | * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
41 | * start the aggregation session after the peer has also responded. | |
42 | * If the peer responds negatively, the session will be stopped | |
43 | * again right away. Note that it is possible for the aggregation | |
44 | * session to be stopped before the driver has indicated that it | |
45 | * is done setting it up, in which case it must not indicate the | |
46 | * setup completion. | |
86ab6c5a | 47 | * |
73a72a81 JB |
48 | * Also note that, since we also need to wait for a response from |
49 | * the peer, the driver is notified of the completion of the | |
50 | * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the | |
51 | * @ampdu_action callback. | |
52 | * | |
53 | * Similarly, when the aggregation session is stopped by the peer | |
54 | * or something calling ieee80211_stop_tx_ba_session(), the driver's | |
55 | * @ampdu_action function will be called with the action | |
56 | * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, | |
57 | * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). | |
86ab6c5a JB |
58 | */ |
59 | ||
b8695a8f JB |
60 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
61 | const u8 *da, u16 tid, | |
62 | u8 dialog_token, u16 start_seq_num, | |
63 | u16 agg_size, u16 timeout) | |
64 | { | |
65 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
66 | struct sk_buff *skb; |
67 | struct ieee80211_mgmt *mgmt; | |
68 | u16 capab; | |
69 | ||
70 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
71 | ||
d15b8459 | 72 | if (!skb) |
b8695a8f | 73 | return; |
d15b8459 | 74 | |
b8695a8f JB |
75 | skb_reserve(skb, local->hw.extra_tx_headroom); |
76 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
77 | memset(mgmt, 0, 24); | |
78 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
80 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
81 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 82 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
83 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
84 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
b8695a8f JB |
85 | |
86 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
87 | IEEE80211_STYPE_ACTION); | |
88 | ||
89 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
90 | ||
91 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
92 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
93 | ||
94 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
95 | capab = (u16)(1 << 1); /* bit 1 aggregation policy */ | |
96 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
97 | capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ | |
98 | ||
99 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
100 | ||
101 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
102 | mgmt->u.action.u.addba_req.start_seq_num = | |
103 | cpu_to_le16(start_seq_num << 4); | |
104 | ||
62ae67be | 105 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
106 | } |
107 | ||
8c771244 | 108 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 109 | { |
8c771244 | 110 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
111 | struct ieee80211_local *local = sdata->local; |
112 | struct sk_buff *skb; | |
113 | struct ieee80211_bar *bar; | |
114 | u16 bar_control = 0; | |
115 | ||
116 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 117 | if (!skb) |
b8695a8f | 118 | return; |
d15b8459 | 119 | |
b8695a8f JB |
120 | skb_reserve(skb, local->hw.extra_tx_headroom); |
121 | bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); | |
122 | memset(bar, 0, sizeof(*bar)); | |
123 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
124 | IEEE80211_STYPE_BACK_REQ); | |
125 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 126 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
127 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
128 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 129 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
130 | bar->control = cpu_to_le16(bar_control); |
131 | bar->start_seq_num = cpu_to_le16(ssn); | |
132 | ||
62ae67be JB |
133 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
134 | ieee80211_tx_skb(sdata, skb); | |
b8695a8f | 135 | } |
8c771244 | 136 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 137 | |
ec034b20 JB |
138 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
139 | struct tid_ampdu_tx *tid_tx) | |
140 | { | |
141 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
142 | lockdep_assert_held(&sta->lock); | |
143 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
144 | } | |
145 | ||
67c282c0 | 146 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
147 | enum ieee80211_back_parties initiator, |
148 | bool tx) | |
23e6a7ea | 149 | { |
849b7967 | 150 | struct ieee80211_local *local = sta->local; |
40b275b6 | 151 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 152 | int ret; |
a622ab72 | 153 | |
cfcdbde3 | 154 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 155 | |
cfcdbde3 JB |
156 | spin_lock_bh(&sta->lock); |
157 | ||
40b275b6 JB |
158 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
159 | if (!tid_tx) { | |
160 | spin_unlock_bh(&sta->lock); | |
161 | return -ENOENT; | |
162 | } | |
163 | ||
0ab33703 JB |
164 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
165 | /* not even started yet! */ | |
ec034b20 | 166 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 167 | spin_unlock_bh(&sta->lock); |
0744371a | 168 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
169 | return 0; |
170 | } | |
171 | ||
cfcdbde3 JB |
172 | spin_unlock_bh(&sta->lock); |
173 | ||
827d42c9 JB |
174 | #ifdef CONFIG_MAC80211_HT_DEBUG |
175 | printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", | |
176 | sta->sta.addr, tid); | |
177 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
178 | ||
a622ab72 | 179 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
23e6a7ea | 180 | |
44271488 JB |
181 | del_timer_sync(&tid_tx->addba_resp_timer); |
182 | ||
a622ab72 JB |
183 | /* |
184 | * After this packets are no longer handed right through | |
185 | * to the driver but are put onto tid_tx->pending instead, | |
186 | * with locking to ensure proper access. | |
187 | */ | |
188 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 189 | |
a622ab72 | 190 | tid_tx->stop_initiator = initiator; |
53f73c09 | 191 | tid_tx->tx_stop = tx; |
23e6a7ea | 192 | |
12375ef9 | 193 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 194 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 195 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
196 | |
197 | /* HW shall not deny going back to legacy */ | |
198 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
199 | /* |
200 | * We may have pending packets get stuck in this case... | |
201 | * Not bothering with a workaround for now. | |
202 | */ | |
23e6a7ea JB |
203 | } |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
b8695a8f JB |
208 | /* |
209 | * After sending add Block Ack request we activated a timer until | |
210 | * add Block Ack response will arrive from the recipient. | |
211 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
212 | */ | |
213 | static void sta_addba_resp_timer_expired(unsigned long data) | |
214 | { | |
215 | /* not an elegant detour, but there is no choice as the timer passes | |
216 | * only one argument, and both sta_info and TID are needed, so init | |
217 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
218 | * array gives the sta through container_of */ | |
219 | u16 tid = *(u8 *)data; | |
23e6a7ea | 220 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 221 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 222 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 223 | |
b8695a8f | 224 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
225 | rcu_read_lock(); |
226 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
227 | if (!tid_tx || |
228 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 229 | rcu_read_unlock(); |
b8695a8f JB |
230 | #ifdef CONFIG_MAC80211_HT_DEBUG |
231 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 232 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 233 | tid); |
b8695a8f | 234 | #endif |
23e6a7ea | 235 | return; |
b8695a8f JB |
236 | } |
237 | ||
238 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
239 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
240 | #endif | |
241 | ||
83a5cbf7 JB |
242 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
243 | rcu_read_unlock(); | |
b8695a8f JB |
244 | } |
245 | ||
96f5e66e JB |
246 | static inline int ieee80211_ac_from_tid(int tid) |
247 | { | |
248 | return ieee802_1d_to_ac[tid & 7]; | |
249 | } | |
250 | ||
a6a67db2 JB |
251 | /* |
252 | * When multiple aggregation sessions on multiple stations | |
253 | * are being created/destroyed simultaneously, we need to | |
254 | * refcount the global queue stop caused by that in order | |
255 | * to not get into a situation where one of the aggregation | |
256 | * setup or teardown re-enables queues before the other is | |
257 | * ready to handle that. | |
258 | * | |
259 | * These two functions take care of this issue by keeping | |
260 | * a global "agg_queue_stop" refcount. | |
261 | */ | |
262 | static void __acquires(agg_queue) | |
263 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
264 | { | |
265 | int queue = ieee80211_ac_from_tid(tid); | |
266 | ||
267 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
268 | ieee80211_stop_queue_by_reason( | |
269 | &local->hw, queue, | |
270 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
271 | __acquire(agg_queue); | |
272 | } | |
273 | ||
274 | static void __releases(agg_queue) | |
275 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
276 | { | |
277 | int queue = ieee80211_ac_from_tid(tid); | |
278 | ||
279 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
280 | ieee80211_wake_queue_by_reason( | |
281 | &local->hw, queue, | |
282 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
283 | __release(agg_queue); | |
284 | } | |
285 | ||
67c282c0 | 286 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 287 | { |
40b275b6 | 288 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
289 | struct ieee80211_local *local = sta->local; |
290 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
291 | u16 start_seq_num; | |
292 | int ret; | |
293 | ||
40b275b6 | 294 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 295 | |
0ab33703 JB |
296 | /* |
297 | * While we're asking the driver about the aggregation, | |
298 | * stop the AC queue so that we don't have to worry | |
299 | * about frames that came in while we were doing that, | |
300 | * which would require us to put them to the AC pending | |
301 | * afterwards which just makes the code more complex. | |
302 | */ | |
303 | ieee80211_stop_queue_agg(local, tid); | |
304 | ||
305 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
306 | ||
307 | /* | |
cfcdbde3 JB |
308 | * make sure no packets are being processed to get |
309 | * valid starting sequence number | |
0ab33703 | 310 | */ |
cfcdbde3 JB |
311 | synchronize_net(); |
312 | ||
0ab33703 JB |
313 | start_seq_num = sta->tid_seq[tid] >> 4; |
314 | ||
315 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 316 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
317 | if (ret) { |
318 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
319 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
320 | " tid %d\n", tid); | |
321 | #endif | |
cfcdbde3 | 322 | spin_lock_bh(&sta->lock); |
ec034b20 | 323 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 JB |
324 | spin_unlock_bh(&sta->lock); |
325 | ||
0ab33703 | 326 | ieee80211_wake_queue_agg(local, tid); |
0744371a | 327 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
328 | return; |
329 | } | |
330 | ||
331 | /* we can take packets again now */ | |
332 | ieee80211_wake_queue_agg(local, tid); | |
333 | ||
334 | /* activate the timer for the recipient's addBA response */ | |
335 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
336 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
337 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
338 | #endif | |
339 | ||
cfcdbde3 | 340 | spin_lock_bh(&sta->lock); |
0ab33703 | 341 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 342 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
343 | |
344 | /* send AddBA request */ | |
345 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
346 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
347 | local->hw.max_tx_aggregation_subframes, |
348 | tid_tx->timeout); | |
0ab33703 JB |
349 | } |
350 | ||
bd2ce6e4 SM |
351 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
352 | u16 timeout) | |
b8695a8f | 353 | { |
c951ad35 JB |
354 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
355 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
356 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 357 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 358 | int ret = 0; |
b8695a8f | 359 | |
b5878a2d JB |
360 | trace_api_start_tx_ba_session(pubsta, tid); |
361 | ||
23e6a7ea JB |
362 | if (WARN_ON(!local->ops->ampdu_action)) |
363 | return -EINVAL; | |
364 | ||
c951ad35 | 365 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
366 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
367 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
368 | return -EINVAL; |
369 | ||
370 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
371 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 372 | pubsta->addr, tid); |
b8695a8f JB |
373 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
374 | ||
8abd3f9b JB |
375 | /* |
376 | * The aggregation code is not prepared to handle | |
377 | * anything but STA/AP due to the BSSID handling. | |
378 | * IBSS could work in the code but isn't supported | |
379 | * by drivers or the standard. | |
380 | */ | |
c951ad35 JB |
381 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
382 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
383 | sdata->vif.type != NL80211_IFTYPE_AP) | |
384 | return -EINVAL; | |
8abd3f9b | 385 | |
c2c98fde | 386 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 387 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 388 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
389 | "Denying BA session request\n"); |
390 | #endif | |
c951ad35 | 391 | return -EINVAL; |
722f069a S |
392 | } |
393 | ||
b8695a8f JB |
394 | spin_lock_bh(&sta->lock); |
395 | ||
396 | /* we have tried too many times, receiver does not want A-MPDU */ | |
397 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
398 | ret = -EBUSY; | |
399 | goto err_unlock_sta; | |
400 | } | |
401 | ||
40b275b6 | 402 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 403 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 404 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
405 | #ifdef CONFIG_MAC80211_HT_DEBUG |
406 | printk(KERN_DEBUG "BA request denied - session is not " | |
407 | "idle on tid %u\n", tid); | |
408 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
409 | ret = -EAGAIN; | |
410 | goto err_unlock_sta; | |
411 | } | |
412 | ||
413 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
414 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
415 | if (!tid_tx) { | |
b8695a8f | 416 | ret = -ENOMEM; |
0ab33703 | 417 | goto err_unlock_sta; |
b8695a8f | 418 | } |
96f5e66e | 419 | |
a622ab72 | 420 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 421 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 422 | |
bd2ce6e4 SM |
423 | tid_tx->timeout = timeout; |
424 | ||
b8695a8f | 425 | /* Tx timer */ |
a622ab72 JB |
426 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
427 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
428 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 429 | |
0ab33703 | 430 | /* assign a dialog token */ |
b8695a8f | 431 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 432 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 433 | |
ec034b20 JB |
434 | /* |
435 | * Finally, assign it to the start array; the work item will | |
436 | * collect it and move it to the normal array. | |
437 | */ | |
438 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 439 | |
0ab33703 | 440 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 441 | |
0ab33703 | 442 | /* this flow continues off the work */ |
96f5e66e | 443 | err_unlock_sta: |
b8695a8f | 444 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
445 | return ret; |
446 | } | |
447 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
448 | ||
cd8ffc80 JB |
449 | /* |
450 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 451 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 452 | */ |
a6a67db2 JB |
453 | static void __acquires(agg_queue) |
454 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
455 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 456 | { |
a6a67db2 | 457 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 458 | unsigned long flags; |
cd8ffc80 | 459 | |
a6a67db2 | 460 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 461 | |
a622ab72 JB |
462 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
463 | " from the pending queue\n", tid)) | |
416fbdff LR |
464 | return; |
465 | ||
a622ab72 | 466 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 467 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 468 | /* copy over remaining packets */ |
a622ab72 JB |
469 | skb_queue_splice_tail_init(&tid_tx->pending, |
470 | &local->pending[queue]); | |
cd8ffc80 JB |
471 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
472 | } | |
473 | } | |
474 | ||
a6a67db2 JB |
475 | static void __releases(agg_queue) |
476 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 477 | { |
a6a67db2 | 478 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
479 | } |
480 | ||
b1720231 JB |
481 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
482 | struct sta_info *sta, u16 tid) | |
483 | { | |
40b275b6 JB |
484 | struct tid_ampdu_tx *tid_tx; |
485 | ||
cfcdbde3 | 486 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 487 | |
40b275b6 JB |
488 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
489 | ||
b1720231 | 490 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 491 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
492 | #endif |
493 | ||
cfcdbde3 JB |
494 | drv_ampdu_action(local, sta->sdata, |
495 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 496 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
497 | |
498 | /* | |
499 | * synchronize with TX path, while splicing the TX path | |
500 | * should block so it won't put more packets onto pending. | |
501 | */ | |
502 | spin_lock_bh(&sta->lock); | |
503 | ||
40b275b6 | 504 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 505 | /* |
a622ab72 JB |
506 | * Now mark as operational. This will be visible |
507 | * in the TX path, and lets it go lock-free in | |
508 | * the common case. | |
cd8ffc80 | 509 | */ |
40b275b6 | 510 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 511 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 512 | |
cfcdbde3 | 513 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
514 | } |
515 | ||
c951ad35 | 516 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 517 | { |
c951ad35 JB |
518 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
519 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 520 | struct sta_info *sta; |
a622ab72 | 521 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 522 | |
b5878a2d JB |
523 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
524 | ||
b8695a8f JB |
525 | if (tid >= STA_TID_NUM) { |
526 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
527 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
528 | tid, STA_TID_NUM); | |
529 | #endif | |
530 | return; | |
531 | } | |
532 | ||
cfcdbde3 | 533 | mutex_lock(&local->sta_mtx); |
abe60632 | 534 | sta = sta_info_get(sdata, ra); |
b8695a8f | 535 | if (!sta) { |
cfcdbde3 | 536 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
537 | #ifdef CONFIG_MAC80211_HT_DEBUG |
538 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
539 | #endif | |
540 | return; | |
541 | } | |
542 | ||
cfcdbde3 | 543 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 544 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 545 | |
a622ab72 | 546 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 547 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 548 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 549 | #endif |
cfcdbde3 | 550 | goto unlock; |
b8695a8f JB |
551 | } |
552 | ||
a622ab72 | 553 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 554 | goto unlock; |
b8695a8f | 555 | |
a622ab72 | 556 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 557 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 558 | |
cfcdbde3 JB |
559 | unlock: |
560 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
561 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 562 | } |
b8695a8f | 563 | |
c951ad35 | 564 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
565 | const u8 *ra, u16 tid) |
566 | { | |
c951ad35 JB |
567 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
568 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
569 | struct ieee80211_ra_tid *ra_tid; |
570 | struct sk_buff *skb = dev_alloc_skb(0); | |
571 | ||
d15b8459 | 572 | if (unlikely(!skb)) |
86ab6c5a | 573 | return; |
d15b8459 | 574 | |
86ab6c5a JB |
575 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
576 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
577 | ra_tid->tid = tid; | |
578 | ||
c1475ca9 JB |
579 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
580 | skb_queue_tail(&sdata->skb_queue, skb); | |
581 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
582 | } |
583 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
584 | ||
849b7967 | 585 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
586 | enum ieee80211_back_parties initiator, |
587 | bool tx) | |
849b7967 | 588 | { |
849b7967 JB |
589 | int ret; |
590 | ||
cfcdbde3 | 591 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 592 | |
53f73c09 | 593 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 594 | |
cfcdbde3 JB |
595 | mutex_unlock(&sta->ampdu_mlme.mtx); |
596 | ||
849b7967 JB |
597 | return ret; |
598 | } | |
b8695a8f | 599 | |
6a8579d0 | 600 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 601 | { |
c951ad35 JB |
602 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
603 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
604 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
605 | struct tid_ampdu_tx *tid_tx; |
606 | int ret = 0; | |
b8695a8f | 607 | |
6a8579d0 | 608 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 609 | |
4253119a | 610 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
611 | return -EINVAL; |
612 | ||
b8695a8f JB |
613 | if (tid >= STA_TID_NUM) |
614 | return -EINVAL; | |
615 | ||
0ab33703 | 616 | spin_lock_bh(&sta->lock); |
40b275b6 | 617 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
618 | |
619 | if (!tid_tx) { | |
620 | ret = -ENOENT; | |
621 | goto unlock; | |
622 | } | |
623 | ||
624 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
625 | /* already in progress stopping it */ | |
626 | ret = 0; | |
627 | goto unlock; | |
628 | } | |
629 | ||
630 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
631 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
632 | ||
633 | unlock: | |
634 | spin_unlock_bh(&sta->lock); | |
635 | return ret; | |
b8695a8f JB |
636 | } |
637 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
638 | ||
c951ad35 | 639 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 640 | { |
c951ad35 JB |
641 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
642 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 643 | struct sta_info *sta; |
a622ab72 | 644 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 645 | |
b5878a2d JB |
646 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
647 | ||
b8695a8f JB |
648 | if (tid >= STA_TID_NUM) { |
649 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
650 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
651 | tid, STA_TID_NUM); | |
652 | #endif | |
653 | return; | |
654 | } | |
655 | ||
656 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
657 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
658 | ra, tid); | |
659 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
660 | ||
cfcdbde3 JB |
661 | mutex_lock(&local->sta_mtx); |
662 | ||
abe60632 | 663 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
664 | if (!sta) { |
665 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
666 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
667 | #endif | |
cfcdbde3 | 668 | goto unlock; |
b8695a8f | 669 | } |
b8695a8f | 670 | |
cfcdbde3 | 671 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 672 | spin_lock_bh(&sta->lock); |
40b275b6 | 673 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
674 | |
675 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
676 | #ifdef CONFIG_MAC80211_HT_DEBUG |
677 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
678 | #endif | |
cfcdbde3 | 679 | goto unlock_sta; |
b8695a8f JB |
680 | } |
681 | ||
53f73c09 | 682 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
683 | ieee80211_send_delba(sta->sdata, ra, tid, |
684 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
685 | ||
a622ab72 JB |
686 | /* |
687 | * When we get here, the TX path will not be lockless any more wrt. | |
688 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
689 | * Thus it will block on getting the lock, if it occurs. So if we | |
690 | * stop the queue now, we will not get any more packets, and any | |
691 | * that might be being processed will wait for us here, thereby | |
692 | * guaranteeing that no packets go to the tid_tx pending queue any | |
693 | * more. | |
694 | */ | |
b8695a8f | 695 | |
a622ab72 | 696 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 697 | |
a622ab72 | 698 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 699 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 700 | |
a622ab72 | 701 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 702 | |
0744371a | 703 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 704 | |
cfcdbde3 | 705 | unlock_sta: |
a622ab72 | 706 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
707 | mutex_unlock(&sta->ampdu_mlme.mtx); |
708 | unlock: | |
709 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 710 | } |
b8695a8f | 711 | |
c951ad35 | 712 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
713 | const u8 *ra, u16 tid) |
714 | { | |
c951ad35 JB |
715 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
716 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
717 | struct ieee80211_ra_tid *ra_tid; |
718 | struct sk_buff *skb = dev_alloc_skb(0); | |
719 | ||
d15b8459 | 720 | if (unlikely(!skb)) |
b8695a8f | 721 | return; |
d15b8459 | 722 | |
b8695a8f JB |
723 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
724 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
725 | ra_tid->tid = tid; | |
726 | ||
c1475ca9 JB |
727 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
728 | skb_queue_tail(&sdata->skb_queue, skb); | |
729 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
730 | } |
731 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
732 | ||
86ab6c5a | 733 | |
b8695a8f JB |
734 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
735 | struct sta_info *sta, | |
736 | struct ieee80211_mgmt *mgmt, | |
737 | size_t len) | |
738 | { | |
a622ab72 | 739 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 740 | u16 capab, tid; |
0b01f030 | 741 | u8 buf_size; |
b8695a8f JB |
742 | |
743 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
744 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 745 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 746 | |
cfcdbde3 | 747 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 748 | |
40b275b6 | 749 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 750 | if (!tid_tx) |
8ade0082 | 751 | goto out; |
b8695a8f | 752 | |
a622ab72 | 753 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
754 | #ifdef CONFIG_MAC80211_HT_DEBUG |
755 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 756 | #endif |
8ade0082 | 757 | goto out; |
b8695a8f JB |
758 | } |
759 | ||
a622ab72 | 760 | del_timer(&tid_tx->addba_resp_timer); |
8ade0082 | 761 | |
b8695a8f | 762 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 763 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 764 | #endif |
3ca97880 HS |
765 | /* |
766 | * IEEE 802.11-2007 7.3.1.14: | |
767 | * In an ADDBA Response frame, when the Status Code field | |
768 | * is set to 0, the Buffer Size subfield is set to a value | |
769 | * of at least 1. | |
770 | */ | |
b8695a8f | 771 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 772 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
773 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
774 | &tid_tx->state)) { | |
775 | /* ignore duplicate response */ | |
776 | goto out; | |
777 | } | |
b8695a8f | 778 | |
0b01f030 JB |
779 | tid_tx->buf_size = buf_size; |
780 | ||
a622ab72 | 781 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 782 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 783 | |
b1720231 | 784 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 785 | } else { |
53f73c09 JB |
786 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
787 | true); | |
b8695a8f | 788 | } |
2171abc5 | 789 | |
2171abc5 | 790 | out: |
cfcdbde3 | 791 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 792 | } |