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> |
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 | |
2a1e0fd1 EG |
195 | /* |
196 | * There might be a few packets being processed right now (on | |
197 | * another CPU) that have already gotten past the aggregation | |
198 | * check when it was still OPERATIONAL and consequently have | |
199 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
200 | * call into the driver at the same time or even before the | |
201 | * TX paths calls into it, which could confuse the driver. | |
202 | * | |
203 | * Wait for all currently running TX paths to finish before | |
204 | * telling the driver. New packets will not go through since | |
205 | * the aggregation session is no longer OPERATIONAL. | |
206 | */ | |
207 | synchronize_net(); | |
208 | ||
a622ab72 | 209 | tid_tx->stop_initiator = initiator; |
53f73c09 | 210 | tid_tx->tx_stop = tx; |
23e6a7ea | 211 | |
12375ef9 | 212 | ret = drv_ampdu_action(local, sta->sdata, |
c951ad35 | 213 | IEEE80211_AMPDU_TX_STOP, |
0b01f030 | 214 | &sta->sta, tid, NULL, 0); |
23e6a7ea JB |
215 | |
216 | /* HW shall not deny going back to legacy */ | |
217 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
218 | /* |
219 | * We may have pending packets get stuck in this case... | |
220 | * Not bothering with a workaround for now. | |
221 | */ | |
23e6a7ea JB |
222 | } |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
b8695a8f JB |
227 | /* |
228 | * After sending add Block Ack request we activated a timer until | |
229 | * add Block Ack response will arrive from the recipient. | |
230 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
231 | */ | |
232 | static void sta_addba_resp_timer_expired(unsigned long data) | |
233 | { | |
234 | /* not an elegant detour, but there is no choice as the timer passes | |
235 | * only one argument, and both sta_info and TID are needed, so init | |
236 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
237 | * array gives the sta through container_of */ | |
238 | u16 tid = *(u8 *)data; | |
23e6a7ea | 239 | struct sta_info *sta = container_of((void *)data, |
b8695a8f | 240 | struct sta_info, timer_to_tid[tid]); |
a622ab72 | 241 | struct tid_ampdu_tx *tid_tx; |
23e6a7ea | 242 | |
b8695a8f | 243 | /* check if the TID waits for addBA response */ |
83a5cbf7 JB |
244 | rcu_read_lock(); |
245 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
a622ab72 JB |
246 | if (!tid_tx || |
247 | test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { | |
83a5cbf7 | 248 | rcu_read_unlock(); |
b8695a8f JB |
249 | #ifdef CONFIG_MAC80211_HT_DEBUG |
250 | printk(KERN_DEBUG "timer expired on tid %d but we are not " | |
67e0f392 | 251 | "(or no longer) expecting addBA response there\n", |
8ade0082 | 252 | tid); |
b8695a8f | 253 | #endif |
23e6a7ea | 254 | return; |
b8695a8f JB |
255 | } |
256 | ||
257 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
258 | printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); | |
259 | #endif | |
260 | ||
83a5cbf7 JB |
261 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
262 | rcu_read_unlock(); | |
b8695a8f JB |
263 | } |
264 | ||
96f5e66e JB |
265 | static inline int ieee80211_ac_from_tid(int tid) |
266 | { | |
267 | return ieee802_1d_to_ac[tid & 7]; | |
268 | } | |
269 | ||
a6a67db2 JB |
270 | /* |
271 | * When multiple aggregation sessions on multiple stations | |
272 | * are being created/destroyed simultaneously, we need to | |
273 | * refcount the global queue stop caused by that in order | |
274 | * to not get into a situation where one of the aggregation | |
275 | * setup or teardown re-enables queues before the other is | |
276 | * ready to handle that. | |
277 | * | |
278 | * These two functions take care of this issue by keeping | |
279 | * a global "agg_queue_stop" refcount. | |
280 | */ | |
281 | static void __acquires(agg_queue) | |
282 | ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) | |
283 | { | |
284 | int queue = ieee80211_ac_from_tid(tid); | |
285 | ||
286 | if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) | |
287 | ieee80211_stop_queue_by_reason( | |
288 | &local->hw, queue, | |
289 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
290 | __acquire(agg_queue); | |
291 | } | |
292 | ||
293 | static void __releases(agg_queue) | |
294 | ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) | |
295 | { | |
296 | int queue = ieee80211_ac_from_tid(tid); | |
297 | ||
298 | if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) | |
299 | ieee80211_wake_queue_by_reason( | |
300 | &local->hw, queue, | |
301 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION); | |
302 | __release(agg_queue); | |
303 | } | |
304 | ||
67c282c0 | 305 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 306 | { |
40b275b6 | 307 | struct tid_ampdu_tx *tid_tx; |
0ab33703 JB |
308 | struct ieee80211_local *local = sta->local; |
309 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
310 | u16 start_seq_num; | |
311 | int ret; | |
312 | ||
40b275b6 | 313 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 314 | |
0ab33703 JB |
315 | /* |
316 | * While we're asking the driver about the aggregation, | |
317 | * stop the AC queue so that we don't have to worry | |
318 | * about frames that came in while we were doing that, | |
319 | * which would require us to put them to the AC pending | |
320 | * afterwards which just makes the code more complex. | |
321 | */ | |
322 | ieee80211_stop_queue_agg(local, tid); | |
323 | ||
324 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); | |
325 | ||
326 | /* | |
cfcdbde3 JB |
327 | * make sure no packets are being processed to get |
328 | * valid starting sequence number | |
0ab33703 | 329 | */ |
cfcdbde3 JB |
330 | synchronize_net(); |
331 | ||
0ab33703 JB |
332 | start_seq_num = sta->tid_seq[tid] >> 4; |
333 | ||
334 | ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START, | |
0b01f030 | 335 | &sta->sta, tid, &start_seq_num, 0); |
0ab33703 JB |
336 | if (ret) { |
337 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
338 | printk(KERN_DEBUG "BA request denied - HW unavailable for" | |
339 | " tid %d\n", tid); | |
340 | #endif | |
cfcdbde3 | 341 | spin_lock_bh(&sta->lock); |
ec034b20 | 342 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 JB |
343 | spin_unlock_bh(&sta->lock); |
344 | ||
0ab33703 | 345 | ieee80211_wake_queue_agg(local, tid); |
0744371a | 346 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
347 | return; |
348 | } | |
349 | ||
350 | /* we can take packets again now */ | |
351 | ieee80211_wake_queue_agg(local, tid); | |
352 | ||
353 | /* activate the timer for the recipient's addBA response */ | |
354 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
355 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
356 | printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); | |
357 | #endif | |
358 | ||
cfcdbde3 | 359 | spin_lock_bh(&sta->lock); |
0ab33703 | 360 | sta->ampdu_mlme.addba_req_num[tid]++; |
cfcdbde3 | 361 | spin_unlock_bh(&sta->lock); |
0ab33703 JB |
362 | |
363 | /* send AddBA request */ | |
364 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
365 | tid_tx->dialog_token, start_seq_num, | |
5dd36bc9 JB |
366 | local->hw.max_tx_aggregation_subframes, |
367 | tid_tx->timeout); | |
0ab33703 JB |
368 | } |
369 | ||
bd2ce6e4 SM |
370 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
371 | u16 timeout) | |
b8695a8f | 372 | { |
c951ad35 JB |
373 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
374 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
375 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 376 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 377 | int ret = 0; |
b8695a8f | 378 | |
b5878a2d JB |
379 | trace_api_start_tx_ba_session(pubsta, tid); |
380 | ||
23e6a7ea JB |
381 | if (WARN_ON(!local->ops->ampdu_action)) |
382 | return -EINVAL; | |
383 | ||
c951ad35 | 384 | if ((tid >= STA_TID_NUM) || |
edf6b784 AN |
385 | !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
386 | (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
387 | return -EINVAL; |
388 | ||
389 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
390 | printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", | |
c951ad35 | 391 | pubsta->addr, tid); |
b8695a8f JB |
392 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
393 | ||
8abd3f9b JB |
394 | /* |
395 | * The aggregation code is not prepared to handle | |
396 | * anything but STA/AP due to the BSSID handling. | |
397 | * IBSS could work in the code but isn't supported | |
398 | * by drivers or the standard. | |
399 | */ | |
c951ad35 JB |
400 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
401 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
402 | sdata->vif.type != NL80211_IFTYPE_AP) | |
403 | return -EINVAL; | |
8abd3f9b | 404 | |
c2c98fde | 405 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
722f069a | 406 | #ifdef CONFIG_MAC80211_HT_DEBUG |
2a419056 | 407 | printk(KERN_DEBUG "BA sessions blocked. " |
722f069a S |
408 | "Denying BA session request\n"); |
409 | #endif | |
c951ad35 | 410 | return -EINVAL; |
722f069a S |
411 | } |
412 | ||
b8695a8f JB |
413 | spin_lock_bh(&sta->lock); |
414 | ||
415 | /* we have tried too many times, receiver does not want A-MPDU */ | |
416 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
417 | ret = -EBUSY; | |
418 | goto err_unlock_sta; | |
419 | } | |
420 | ||
40b275b6 | 421 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 422 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 423 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
b8695a8f JB |
424 | #ifdef CONFIG_MAC80211_HT_DEBUG |
425 | printk(KERN_DEBUG "BA request denied - session is not " | |
426 | "idle on tid %u\n", tid); | |
427 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
428 | ret = -EAGAIN; | |
429 | goto err_unlock_sta; | |
430 | } | |
431 | ||
432 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
433 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
434 | if (!tid_tx) { | |
b8695a8f | 435 | ret = -ENOMEM; |
0ab33703 | 436 | goto err_unlock_sta; |
b8695a8f | 437 | } |
96f5e66e | 438 | |
a622ab72 | 439 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 440 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 441 | |
bd2ce6e4 SM |
442 | tid_tx->timeout = timeout; |
443 | ||
b8695a8f | 444 | /* Tx timer */ |
a622ab72 JB |
445 | tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
446 | tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
447 | init_timer(&tid_tx->addba_resp_timer); | |
b8695a8f | 448 | |
0ab33703 | 449 | /* assign a dialog token */ |
b8695a8f | 450 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 451 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 452 | |
ec034b20 JB |
453 | /* |
454 | * Finally, assign it to the start array; the work item will | |
455 | * collect it and move it to the normal array. | |
456 | */ | |
457 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 458 | |
0ab33703 | 459 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 460 | |
0ab33703 | 461 | /* this flow continues off the work */ |
96f5e66e | 462 | err_unlock_sta: |
b8695a8f | 463 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
464 | return ret; |
465 | } | |
466 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
467 | ||
cd8ffc80 JB |
468 | /* |
469 | * splice packets from the STA's pending to the local pending, | |
a6a67db2 | 470 | * requires a call to ieee80211_agg_splice_finish later |
cd8ffc80 | 471 | */ |
a6a67db2 JB |
472 | static void __acquires(agg_queue) |
473 | ieee80211_agg_splice_packets(struct ieee80211_local *local, | |
474 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
cd8ffc80 | 475 | { |
a6a67db2 | 476 | int queue = ieee80211_ac_from_tid(tid); |
cd8ffc80 | 477 | unsigned long flags; |
cd8ffc80 | 478 | |
a6a67db2 | 479 | ieee80211_stop_queue_agg(local, tid); |
cd8ffc80 | 480 | |
a622ab72 JB |
481 | if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
482 | " from the pending queue\n", tid)) | |
416fbdff LR |
483 | return; |
484 | ||
a622ab72 | 485 | if (!skb_queue_empty(&tid_tx->pending)) { |
cd8ffc80 | 486 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
cd8ffc80 | 487 | /* copy over remaining packets */ |
a622ab72 JB |
488 | skb_queue_splice_tail_init(&tid_tx->pending, |
489 | &local->pending[queue]); | |
cd8ffc80 JB |
490 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
491 | } | |
492 | } | |
493 | ||
a6a67db2 JB |
494 | static void __releases(agg_queue) |
495 | ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) | |
cd8ffc80 | 496 | { |
a6a67db2 | 497 | ieee80211_wake_queue_agg(local, tid); |
cd8ffc80 JB |
498 | } |
499 | ||
b1720231 JB |
500 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
501 | struct sta_info *sta, u16 tid) | |
502 | { | |
40b275b6 JB |
503 | struct tid_ampdu_tx *tid_tx; |
504 | ||
cfcdbde3 | 505 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 506 | |
40b275b6 JB |
507 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
508 | ||
b1720231 | 509 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 510 | printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
b1720231 JB |
511 | #endif |
512 | ||
cfcdbde3 JB |
513 | drv_ampdu_action(local, sta->sdata, |
514 | IEEE80211_AMPDU_TX_OPERATIONAL, | |
40b275b6 | 515 | &sta->sta, tid, NULL, tid_tx->buf_size); |
cfcdbde3 JB |
516 | |
517 | /* | |
518 | * synchronize with TX path, while splicing the TX path | |
519 | * should block so it won't put more packets onto pending. | |
520 | */ | |
521 | spin_lock_bh(&sta->lock); | |
522 | ||
40b275b6 | 523 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
cd8ffc80 | 524 | /* |
a622ab72 JB |
525 | * Now mark as operational. This will be visible |
526 | * in the TX path, and lets it go lock-free in | |
527 | * the common case. | |
cd8ffc80 | 528 | */ |
40b275b6 | 529 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
a622ab72 | 530 | ieee80211_agg_splice_finish(local, tid); |
b1720231 | 531 | |
cfcdbde3 | 532 | spin_unlock_bh(&sta->lock); |
b1720231 JB |
533 | } |
534 | ||
c951ad35 | 535 | void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
b8695a8f | 536 | { |
c951ad35 JB |
537 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
538 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 539 | struct sta_info *sta; |
a622ab72 | 540 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 541 | |
b5878a2d JB |
542 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
543 | ||
b8695a8f JB |
544 | if (tid >= STA_TID_NUM) { |
545 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
546 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
547 | tid, STA_TID_NUM); | |
548 | #endif | |
549 | return; | |
550 | } | |
551 | ||
cfcdbde3 | 552 | mutex_lock(&local->sta_mtx); |
abe60632 | 553 | sta = sta_info_get(sdata, ra); |
b8695a8f | 554 | if (!sta) { |
cfcdbde3 | 555 | mutex_unlock(&local->sta_mtx); |
b8695a8f JB |
556 | #ifdef CONFIG_MAC80211_HT_DEBUG |
557 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
558 | #endif | |
559 | return; | |
560 | } | |
561 | ||
cfcdbde3 | 562 | mutex_lock(&sta->ampdu_mlme.mtx); |
40b275b6 | 563 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 564 | |
a622ab72 | 565 | if (WARN_ON(!tid_tx)) { |
b8695a8f | 566 | #ifdef CONFIG_MAC80211_HT_DEBUG |
a622ab72 | 567 | printk(KERN_DEBUG "addBA was not requested!\n"); |
b8695a8f | 568 | #endif |
cfcdbde3 | 569 | goto unlock; |
b8695a8f JB |
570 | } |
571 | ||
a622ab72 | 572 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
cfcdbde3 | 573 | goto unlock; |
b8695a8f | 574 | |
a622ab72 | 575 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
b1720231 | 576 | ieee80211_agg_tx_operational(local, sta, tid); |
96f5e66e | 577 | |
cfcdbde3 JB |
578 | unlock: |
579 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
580 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 581 | } |
b8695a8f | 582 | |
c951ad35 | 583 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
584 | const u8 *ra, u16 tid) |
585 | { | |
c951ad35 JB |
586 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
587 | struct ieee80211_local *local = sdata->local; | |
86ab6c5a JB |
588 | struct ieee80211_ra_tid *ra_tid; |
589 | struct sk_buff *skb = dev_alloc_skb(0); | |
590 | ||
d15b8459 | 591 | if (unlikely(!skb)) |
86ab6c5a | 592 | return; |
d15b8459 | 593 | |
86ab6c5a JB |
594 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
595 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
596 | ra_tid->tid = tid; | |
597 | ||
c1475ca9 JB |
598 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
599 | skb_queue_tail(&sdata->skb_queue, skb); | |
600 | ieee80211_queue_work(&local->hw, &sdata->work); | |
86ab6c5a JB |
601 | } |
602 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
603 | ||
849b7967 | 604 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
53f73c09 JB |
605 | enum ieee80211_back_parties initiator, |
606 | bool tx) | |
849b7967 | 607 | { |
849b7967 JB |
608 | int ret; |
609 | ||
cfcdbde3 | 610 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 611 | |
53f73c09 | 612 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
849b7967 | 613 | |
cfcdbde3 JB |
614 | mutex_unlock(&sta->ampdu_mlme.mtx); |
615 | ||
849b7967 JB |
616 | return ret; |
617 | } | |
b8695a8f | 618 | |
6a8579d0 | 619 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 620 | { |
c951ad35 JB |
621 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
622 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
623 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
624 | struct tid_ampdu_tx *tid_tx; |
625 | int ret = 0; | |
b8695a8f | 626 | |
6a8579d0 | 627 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 628 | |
4253119a | 629 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
630 | return -EINVAL; |
631 | ||
b8695a8f JB |
632 | if (tid >= STA_TID_NUM) |
633 | return -EINVAL; | |
634 | ||
0ab33703 | 635 | spin_lock_bh(&sta->lock); |
40b275b6 | 636 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
637 | |
638 | if (!tid_tx) { | |
639 | ret = -ENOENT; | |
640 | goto unlock; | |
641 | } | |
642 | ||
643 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
644 | /* already in progress stopping it */ | |
645 | ret = 0; | |
646 | goto unlock; | |
647 | } | |
648 | ||
649 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
650 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
651 | ||
652 | unlock: | |
653 | spin_unlock_bh(&sta->lock); | |
654 | return ret; | |
b8695a8f JB |
655 | } |
656 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
657 | ||
c951ad35 | 658 | void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
b8695a8f | 659 | { |
c951ad35 JB |
660 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
661 | struct ieee80211_local *local = sdata->local; | |
b8695a8f | 662 | struct sta_info *sta; |
a622ab72 | 663 | struct tid_ampdu_tx *tid_tx; |
b8695a8f | 664 | |
b5878a2d JB |
665 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
666 | ||
b8695a8f JB |
667 | if (tid >= STA_TID_NUM) { |
668 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
669 | printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", | |
670 | tid, STA_TID_NUM); | |
671 | #endif | |
672 | return; | |
673 | } | |
674 | ||
675 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
676 | printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", | |
677 | ra, tid); | |
678 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
679 | ||
cfcdbde3 JB |
680 | mutex_lock(&local->sta_mtx); |
681 | ||
abe60632 | 682 | sta = sta_info_get(sdata, ra); |
b8695a8f JB |
683 | if (!sta) { |
684 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
685 | printk(KERN_DEBUG "Could not find station: %pM\n", ra); | |
686 | #endif | |
cfcdbde3 | 687 | goto unlock; |
b8695a8f | 688 | } |
b8695a8f | 689 | |
cfcdbde3 | 690 | mutex_lock(&sta->ampdu_mlme.mtx); |
a622ab72 | 691 | spin_lock_bh(&sta->lock); |
40b275b6 | 692 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 JB |
693 | |
694 | if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
b8695a8f JB |
695 | #ifdef CONFIG_MAC80211_HT_DEBUG |
696 | printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); | |
697 | #endif | |
cfcdbde3 | 698 | goto unlock_sta; |
b8695a8f JB |
699 | } |
700 | ||
53f73c09 | 701 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
b8695a8f JB |
702 | ieee80211_send_delba(sta->sdata, ra, tid, |
703 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); | |
704 | ||
a622ab72 JB |
705 | /* |
706 | * When we get here, the TX path will not be lockless any more wrt. | |
707 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
708 | * Thus it will block on getting the lock, if it occurs. So if we | |
709 | * stop the queue now, we will not get any more packets, and any | |
710 | * that might be being processed will wait for us here, thereby | |
711 | * guaranteeing that no packets go to the tid_tx pending queue any | |
712 | * more. | |
713 | */ | |
b8695a8f | 714 | |
a622ab72 | 715 | ieee80211_agg_splice_packets(local, tid_tx, tid); |
96f5e66e | 716 | |
a622ab72 | 717 | /* future packets must not find the tid_tx struct any more */ |
ec034b20 | 718 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cd8ffc80 | 719 | |
a622ab72 | 720 | ieee80211_agg_splice_finish(local, tid); |
cd8ffc80 | 721 | |
0744371a | 722 | kfree_rcu(tid_tx, rcu_head); |
b8695a8f | 723 | |
cfcdbde3 | 724 | unlock_sta: |
a622ab72 | 725 | spin_unlock_bh(&sta->lock); |
cfcdbde3 JB |
726 | mutex_unlock(&sta->ampdu_mlme.mtx); |
727 | unlock: | |
728 | mutex_unlock(&local->sta_mtx); | |
b8695a8f | 729 | } |
b8695a8f | 730 | |
c951ad35 | 731 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
732 | const u8 *ra, u16 tid) |
733 | { | |
c951ad35 JB |
734 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
735 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
736 | struct ieee80211_ra_tid *ra_tid; |
737 | struct sk_buff *skb = dev_alloc_skb(0); | |
738 | ||
d15b8459 | 739 | if (unlikely(!skb)) |
b8695a8f | 740 | return; |
d15b8459 | 741 | |
b8695a8f JB |
742 | ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
743 | memcpy(&ra_tid->ra, ra, ETH_ALEN); | |
744 | ra_tid->tid = tid; | |
745 | ||
c1475ca9 JB |
746 | skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
747 | skb_queue_tail(&sdata->skb_queue, skb); | |
748 | ieee80211_queue_work(&local->hw, &sdata->work); | |
b8695a8f JB |
749 | } |
750 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
751 | ||
86ab6c5a | 752 | |
b8695a8f JB |
753 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
754 | struct sta_info *sta, | |
755 | struct ieee80211_mgmt *mgmt, | |
756 | size_t len) | |
757 | { | |
a622ab72 | 758 | struct tid_ampdu_tx *tid_tx; |
b1720231 | 759 | u16 capab, tid; |
0b01f030 | 760 | u8 buf_size; |
b8695a8f JB |
761 | |
762 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
763 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
0b01f030 | 764 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
b8695a8f | 765 | |
cfcdbde3 | 766 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 767 | |
40b275b6 | 768 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 769 | if (!tid_tx) |
8ade0082 | 770 | goto out; |
b8695a8f | 771 | |
a622ab72 | 772 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
b8695a8f JB |
773 | #ifdef CONFIG_MAC80211_HT_DEBUG |
774 | printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); | |
a622ab72 | 775 | #endif |
8ade0082 | 776 | goto out; |
b8695a8f JB |
777 | } |
778 | ||
d305a655 | 779 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 780 | |
b8695a8f | 781 | #ifdef CONFIG_MAC80211_HT_DEBUG |
55f98938 | 782 | printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
a622ab72 | 783 | #endif |
d305a655 NM |
784 | |
785 | /* | |
786 | * addba_resp_timer may have fired before we got here, and | |
787 | * caused WANT_STOP to be set. If the stop then was already | |
788 | * processed further, STOPPING might be set. | |
789 | */ | |
790 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
791 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
792 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
793 | printk(KERN_DEBUG | |
794 | "got addBA resp for tid %d but we already gave up\n", | |
795 | tid); | |
796 | #endif | |
797 | goto out; | |
798 | } | |
799 | ||
3ca97880 HS |
800 | /* |
801 | * IEEE 802.11-2007 7.3.1.14: | |
802 | * In an ADDBA Response frame, when the Status Code field | |
803 | * is set to 0, the Buffer Size subfield is set to a value | |
804 | * of at least 1. | |
805 | */ | |
b8695a8f | 806 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 807 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
808 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
809 | &tid_tx->state)) { | |
810 | /* ignore duplicate response */ | |
811 | goto out; | |
812 | } | |
b8695a8f | 813 | |
0b01f030 JB |
814 | tid_tx->buf_size = buf_size; |
815 | ||
a622ab72 | 816 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 817 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 818 | |
b1720231 | 819 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
b8695a8f | 820 | } else { |
53f73c09 JB |
821 | ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
822 | true); | |
b8695a8f | 823 | } |
2171abc5 | 824 | |
2171abc5 | 825 | out: |
cfcdbde3 | 826 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 827 | } |