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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b8695a8f JB |
2 | /* |
3 | * HT handling | |
4 | * | |
5 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
6 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
7 | * Copyright 2005-2006, Devicescape Software, Inc. | |
8 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
9 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
cfcdbde3 | 10 | * Copyright 2007-2010, Intel Corporation |
7a7c0a64 | 11 | * Copyright(c) 2015-2017 Intel Deutschland GmbH |
a6bce782 | 12 | * Copyright (C) 2018 - 2022 Intel Corporation |
b8695a8f JB |
13 | */ |
14 | ||
15 | #include <linux/ieee80211.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
bc3b2d7f | 17 | #include <linux/export.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(). | |
42624d49 YAP |
57 | * Note that the sta can get destroyed before the BA tear down is |
58 | * complete. | |
86ab6c5a JB |
59 | */ |
60 | ||
b8695a8f JB |
61 | static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
62 | const u8 *da, u16 tid, | |
63 | u8 dialog_token, u16 start_seq_num, | |
64 | u16 agg_size, u16 timeout) | |
65 | { | |
66 | struct ieee80211_local *local = sdata->local; | |
b8695a8f JB |
67 | struct sk_buff *skb; |
68 | struct ieee80211_mgmt *mgmt; | |
69 | u16 capab; | |
70 | ||
71 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
72 | ||
d15b8459 | 73 | if (!skb) |
b8695a8f | 74 | return; |
d15b8459 | 75 | |
b8695a8f | 76 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 77 | mgmt = skb_put_zero(skb, 24); |
b8695a8f | 78 | memcpy(mgmt->da, da, ETH_ALEN); |
47846c9b | 79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 80 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
81 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
82 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 83 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 | 84 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f7ee3041 | 85 | memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); |
13c40c54 AS |
86 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
87 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); | |
b8695a8f JB |
88 | |
89 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
90 | IEEE80211_STYPE_ACTION); | |
91 | ||
92 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); | |
93 | ||
94 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
95 | mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; | |
96 | ||
97 | mgmt->u.action.u.addba_req.dialog_token = dialog_token; | |
db8ebd06 JB |
98 | capab = IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
99 | capab |= IEEE80211_ADDBA_PARAM_POLICY_MASK; | |
100 | capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); | |
101 | capab |= u16_encode_bits(agg_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); | |
b8695a8f JB |
102 | |
103 | mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); | |
104 | ||
105 | mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); | |
106 | mgmt->u.action.u.addba_req.start_seq_num = | |
107 | cpu_to_le16(start_seq_num << 4); | |
108 | ||
e1e68b14 | 109 | ieee80211_tx_skb_tid(sdata, skb, tid, -1); |
b8695a8f JB |
110 | } |
111 | ||
8c771244 | 112 | void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
b8695a8f | 113 | { |
8c771244 | 114 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
b8695a8f JB |
115 | struct ieee80211_local *local = sdata->local; |
116 | struct sk_buff *skb; | |
117 | struct ieee80211_bar *bar; | |
118 | u16 bar_control = 0; | |
119 | ||
120 | skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); | |
d15b8459 | 121 | if (!skb) |
b8695a8f | 122 | return; |
d15b8459 | 123 | |
b8695a8f | 124 | skb_reserve(skb, local->hw.extra_tx_headroom); |
b080db58 | 125 | bar = skb_put_zero(skb, sizeof(*bar)); |
b8695a8f JB |
126 | bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
127 | IEEE80211_STYPE_BACK_REQ); | |
128 | memcpy(bar->ra, ra, ETH_ALEN); | |
47846c9b | 129 | memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
b8695a8f JB |
130 | bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
131 | bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; | |
c1407b6c | 132 | bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
b8695a8f JB |
133 | bar->control = cpu_to_le16(bar_control); |
134 | bar->start_seq_num = cpu_to_le16(ssn); | |
135 | ||
2f7916f8 CL |
136 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
137 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
e1e68b14 | 138 | ieee80211_tx_skb_tid(sdata, skb, tid, -1); |
b8695a8f | 139 | } |
8c771244 | 140 | EXPORT_SYMBOL(ieee80211_send_bar); |
b8695a8f | 141 | |
ec034b20 JB |
142 | void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
143 | struct tid_ampdu_tx *tid_tx) | |
144 | { | |
145 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
146 | lockdep_assert_held(&sta->lock); | |
147 | rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); | |
148 | } | |
149 | ||
30bf5f1f JB |
150 | /* |
151 | * When multiple aggregation sessions on multiple stations | |
152 | * are being created/destroyed simultaneously, we need to | |
153 | * refcount the global queue stop caused by that in order | |
154 | * to not get into a situation where one of the aggregation | |
155 | * setup or teardown re-enables queues before the other is | |
156 | * ready to handle that. | |
157 | * | |
158 | * These two functions take care of this issue by keeping | |
159 | * a global "agg_queue_stop" refcount. | |
160 | */ | |
161 | static void __acquires(agg_queue) | |
162 | ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
163 | { | |
164 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
165 | ||
cca07b00 LC |
166 | /* we do refcounting here, so don't use the queue reason refcounting */ |
167 | ||
30bf5f1f JB |
168 | if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
169 | ieee80211_stop_queue_by_reason( | |
170 | &sdata->local->hw, queue, | |
cca07b00 LC |
171 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
172 | false); | |
30bf5f1f JB |
173 | __acquire(agg_queue); |
174 | } | |
175 | ||
176 | static void __releases(agg_queue) | |
177 | ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) | |
178 | { | |
179 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
180 | ||
181 | if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) | |
182 | ieee80211_wake_queue_by_reason( | |
183 | &sdata->local->hw, queue, | |
cca07b00 LC |
184 | IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
185 | false); | |
30bf5f1f JB |
186 | __release(agg_queue); |
187 | } | |
188 | ||
ba8c3d6f FF |
189 | static void |
190 | ieee80211_agg_stop_txq(struct sta_info *sta, int tid) | |
191 | { | |
192 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
fa962b92 MK |
193 | struct ieee80211_sub_if_data *sdata; |
194 | struct fq *fq; | |
ba8c3d6f FF |
195 | struct txq_info *txqi; |
196 | ||
197 | if (!txq) | |
198 | return; | |
199 | ||
200 | txqi = to_txq_info(txq); | |
fa962b92 MK |
201 | sdata = vif_to_sdata(txq->vif); |
202 | fq = &sdata->local->fq; | |
ba8c3d6f FF |
203 | |
204 | /* Lock here to protect against further seqno updates on dequeue */ | |
fa962b92 | 205 | spin_lock_bh(&fq->lock); |
ba8c3d6f | 206 | set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
fa962b92 | 207 | spin_unlock_bh(&fq->lock); |
ba8c3d6f FF |
208 | } |
209 | ||
210 | static void | |
211 | ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) | |
212 | { | |
213 | struct ieee80211_txq *txq = sta->sta.txq[tid]; | |
214 | struct txq_info *txqi; | |
215 | ||
06c41bda JB |
216 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
217 | ||
ba8c3d6f FF |
218 | if (!txq) |
219 | return; | |
220 | ||
221 | txqi = to_txq_info(txq); | |
222 | ||
223 | if (enable) | |
224 | set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
225 | else | |
226 | clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); | |
227 | ||
228 | clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); | |
979e1f08 JB |
229 | local_bh_disable(); |
230 | rcu_read_lock(); | |
18667600 | 231 | schedule_and_wake_txq(sta->sdata->local, txqi); |
979e1f08 JB |
232 | rcu_read_unlock(); |
233 | local_bh_enable(); | |
ba8c3d6f FF |
234 | } |
235 | ||
30bf5f1f JB |
236 | /* |
237 | * splice packets from the STA's pending to the local pending, | |
238 | * requires a call to ieee80211_agg_splice_finish later | |
239 | */ | |
240 | static void __acquires(agg_queue) | |
241 | ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, | |
242 | struct tid_ampdu_tx *tid_tx, u16 tid) | |
243 | { | |
244 | struct ieee80211_local *local = sdata->local; | |
245 | int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; | |
246 | unsigned long flags; | |
247 | ||
248 | ieee80211_stop_queue_agg(sdata, tid); | |
249 | ||
250 | if (WARN(!tid_tx, | |
251 | "TID %d gone but expected when splicing aggregates from the pending queue\n", | |
252 | tid)) | |
253 | return; | |
254 | ||
255 | if (!skb_queue_empty(&tid_tx->pending)) { | |
256 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
257 | /* copy over remaining packets */ | |
258 | skb_queue_splice_tail_init(&tid_tx->pending, | |
259 | &local->pending[queue]); | |
260 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
261 | } | |
262 | } | |
263 | ||
264 | static void __releases(agg_queue) | |
265 | ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) | |
266 | { | |
267 | ieee80211_wake_queue_agg(sdata, tid); | |
268 | } | |
269 | ||
270 | static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) | |
271 | { | |
272 | struct tid_ampdu_tx *tid_tx; | |
273 | ||
274 | lockdep_assert_held(&sta->ampdu_mlme.mtx); | |
275 | lockdep_assert_held(&sta->lock); | |
276 | ||
277 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); | |
278 | ||
279 | /* | |
280 | * When we get here, the TX path will not be lockless any more wrt. | |
281 | * aggregation, since the OPERATIONAL bit has long been cleared. | |
282 | * Thus it will block on getting the lock, if it occurs. So if we | |
283 | * stop the queue now, we will not get any more packets, and any | |
284 | * that might be being processed will wait for us here, thereby | |
285 | * guaranteeing that no packets go to the tid_tx pending queue any | |
286 | * more. | |
287 | */ | |
288 | ||
289 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); | |
290 | ||
291 | /* future packets must not find the tid_tx struct any more */ | |
292 | ieee80211_assign_tid_tx(sta, tid, NULL); | |
293 | ||
294 | ieee80211_agg_splice_finish(sta->sdata, tid); | |
295 | ||
296 | kfree_rcu(tid_tx, rcu_head); | |
297 | } | |
298 | ||
67c282c0 | 299 | int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 300 | enum ieee80211_agg_stop_reason reason) |
23e6a7ea | 301 | { |
849b7967 | 302 | struct ieee80211_local *local = sta->local; |
40b275b6 | 303 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
304 | struct ieee80211_ampdu_params params = { |
305 | .sta = &sta->sta, | |
306 | .tid = tid, | |
307 | .buf_size = 0, | |
308 | .amsdu = false, | |
309 | .timeout = 0, | |
310 | .ssn = 0, | |
311 | }; | |
23e6a7ea | 312 | int ret; |
a622ab72 | 313 | |
cfcdbde3 | 314 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 315 | |
18b559d5 JB |
316 | switch (reason) { |
317 | case AGG_STOP_DECLINED: | |
318 | case AGG_STOP_LOCAL_REQUEST: | |
319 | case AGG_STOP_PEER_REQUEST: | |
50ea05ef | 320 | params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
18b559d5 JB |
321 | break; |
322 | case AGG_STOP_DESTROY_STA: | |
50ea05ef | 323 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
18b559d5 JB |
324 | break; |
325 | default: | |
326 | WARN_ON_ONCE(1); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
cfcdbde3 JB |
330 | spin_lock_bh(&sta->lock); |
331 | ||
33ddd81e JB |
332 | /* free struct pending for start, if present */ |
333 | tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; | |
334 | kfree(tid_tx); | |
335 | sta->ampdu_mlme.tid_start_tx[tid] = NULL; | |
336 | ||
40b275b6 JB |
337 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
338 | if (!tid_tx) { | |
339 | spin_unlock_bh(&sta->lock); | |
340 | return -ENOENT; | |
341 | } | |
342 | ||
18b559d5 JB |
343 | /* |
344 | * if we're already stopping ignore any new requests to stop | |
345 | * unless we're destroying it in which case notify the driver | |
346 | */ | |
24f50a9d JB |
347 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
348 | spin_unlock_bh(&sta->lock); | |
18b559d5 JB |
349 | if (reason != AGG_STOP_DESTROY_STA) |
350 | return -EALREADY; | |
50ea05ef SS |
351 | params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
352 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); | |
18b559d5 | 353 | WARN_ON_ONCE(ret); |
8147dc7f | 354 | return 0; |
24f50a9d JB |
355 | } |
356 | ||
0ab33703 JB |
357 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
358 | /* not even started yet! */ | |
ec034b20 | 359 | ieee80211_assign_tid_tx(sta, tid, NULL); |
cfcdbde3 | 360 | spin_unlock_bh(&sta->lock); |
0744371a | 361 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
362 | return 0; |
363 | } | |
364 | ||
24f50a9d JB |
365 | set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
366 | ||
6157ca0d IP |
367 | ieee80211_agg_stop_txq(sta, tid); |
368 | ||
cfcdbde3 JB |
369 | spin_unlock_bh(&sta->lock); |
370 | ||
bdcbd8e0 JB |
371 | ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
372 | sta->sta.addr, tid); | |
827d42c9 | 373 | |
44271488 | 374 | del_timer_sync(&tid_tx->addba_resp_timer); |
285fa695 | 375 | del_timer_sync(&tid_tx->session_timer); |
44271488 | 376 | |
a622ab72 JB |
377 | /* |
378 | * After this packets are no longer handed right through | |
379 | * to the driver but are put onto tid_tx->pending instead, | |
380 | * with locking to ensure proper access. | |
381 | */ | |
382 | clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); | |
736708bd | 383 | |
2a1e0fd1 EG |
384 | /* |
385 | * There might be a few packets being processed right now (on | |
386 | * another CPU) that have already gotten past the aggregation | |
387 | * check when it was still OPERATIONAL and consequently have | |
388 | * IEEE80211_TX_CTL_AMPDU set. In that case, this code might | |
389 | * call into the driver at the same time or even before the | |
390 | * TX paths calls into it, which could confuse the driver. | |
391 | * | |
392 | * Wait for all currently running TX paths to finish before | |
393 | * telling the driver. New packets will not go through since | |
394 | * the aggregation session is no longer OPERATIONAL. | |
395 | */ | |
2316380f SS |
396 | if (!local->in_reconfig) |
397 | synchronize_net(); | |
2a1e0fd1 | 398 | |
c82c4a80 JB |
399 | tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
400 | WLAN_BACK_RECIPIENT : | |
401 | WLAN_BACK_INITIATOR; | |
402 | tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; | |
23e6a7ea | 403 | |
50ea05ef | 404 | ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
23e6a7ea JB |
405 | |
406 | /* HW shall not deny going back to legacy */ | |
407 | if (WARN_ON(ret)) { | |
cd8ffc80 JB |
408 | /* |
409 | * We may have pending packets get stuck in this case... | |
410 | * Not bothering with a workaround for now. | |
411 | */ | |
23e6a7ea JB |
412 | } |
413 | ||
8147dc7f JB |
414 | /* |
415 | * In the case of AGG_STOP_DESTROY_STA, the driver won't | |
416 | * necessarily call ieee80211_stop_tx_ba_cb(), so this may | |
417 | * seem like we can leave the tid_tx data pending forever. | |
418 | * This is true, in a way, but "forever" is only until the | |
419 | * station struct is actually destroyed. In the meantime, | |
420 | * leaving it around ensures that we don't transmit packets | |
421 | * to the driver on this TID which might confuse it. | |
422 | */ | |
18b559d5 JB |
423 | |
424 | return 0; | |
23e6a7ea JB |
425 | } |
426 | ||
b8695a8f JB |
427 | /* |
428 | * After sending add Block Ack request we activated a timer until | |
429 | * add Block Ack response will arrive from the recipient. | |
430 | * If this timer expires sta_addba_resp_timer_expired will be executed. | |
431 | */ | |
7cca2acd | 432 | static void sta_addba_resp_timer_expired(struct timer_list *t) |
b8695a8f | 433 | { |
d559e303 JB |
434 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer); |
435 | struct sta_info *sta = tid_tx->sta; | |
436 | u8 tid = tid_tx->tid; | |
23e6a7ea | 437 | |
b8695a8f | 438 | /* check if the TID waits for addBA response */ |
d559e303 | 439 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
bdcbd8e0 | 440 | ht_dbg(sta->sdata, |
d81b0fd0 | 441 | "timer expired on %pM tid %d not expecting addBA response\n", |
0a214d3f | 442 | sta->sta.addr, tid); |
23e6a7ea | 443 | return; |
b8695a8f JB |
444 | } |
445 | ||
0a214d3f JB |
446 | ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
447 | sta->sta.addr, tid); | |
b8695a8f | 448 | |
83a5cbf7 | 449 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
b8695a8f JB |
450 | } |
451 | ||
31d8bb4e MG |
452 | static void ieee80211_send_addba_with_timeout(struct sta_info *sta, |
453 | struct tid_ampdu_tx *tid_tx) | |
454 | { | |
455 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
456 | struct ieee80211_local *local = sta->local; | |
457 | u8 tid = tid_tx->tid; | |
458 | u16 buf_size; | |
459 | ||
460 | /* activate the timer for the recipient's addBA response */ | |
461 | mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); | |
462 | ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", | |
463 | sta->sta.addr, tid); | |
464 | ||
465 | spin_lock_bh(&sta->lock); | |
466 | sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; | |
467 | sta->ampdu_mlme.addba_req_num[tid]++; | |
468 | spin_unlock_bh(&sta->lock); | |
469 | ||
046d2e7c | 470 | if (sta->sta.deflink.he_cap.has_he) { |
31d8bb4e MG |
471 | buf_size = local->hw.max_tx_aggregation_subframes; |
472 | } else { | |
473 | /* | |
474 | * We really should use what the driver told us it will | |
475 | * transmit as the maximum, but certain APs (e.g. the | |
476 | * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012) | |
477 | * will crash when we use a lower number. | |
478 | */ | |
479 | buf_size = IEEE80211_MAX_AMPDU_BUF_HT; | |
480 | } | |
481 | ||
482 | /* send AddBA request */ | |
483 | ieee80211_send_addba_request(sdata, sta->sta.addr, tid, | |
73111efa | 484 | tid_tx->dialog_token, tid_tx->ssn, |
31d8bb4e | 485 | buf_size, tid_tx->timeout); |
0c197f16 MG |
486 | |
487 | WARN_ON(test_and_set_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)); | |
31d8bb4e MG |
488 | } |
489 | ||
67c282c0 | 490 | void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
0ab33703 | 491 | { |
40b275b6 | 492 | struct tid_ampdu_tx *tid_tx; |
0ab33703 | 493 | struct ieee80211_local *local = sta->local; |
69403bad | 494 | struct ieee80211_sub_if_data *sdata; |
50ea05ef SS |
495 | struct ieee80211_ampdu_params params = { |
496 | .sta = &sta->sta, | |
497 | .action = IEEE80211_AMPDU_TX_START, | |
498 | .tid = tid, | |
499 | .buf_size = 0, | |
500 | .amsdu = false, | |
501 | .timeout = 0, | |
502 | }; | |
0ab33703 JB |
503 | int ret; |
504 | ||
40b275b6 | 505 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
cfcdbde3 | 506 | |
0ab33703 | 507 | /* |
15062e6a JB |
508 | * Start queuing up packets for this aggregation session. |
509 | * We're going to release them once the driver is OK with | |
510 | * that. | |
0ab33703 | 511 | */ |
0ab33703 JB |
512 | clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
513 | ||
514 | /* | |
15062e6a JB |
515 | * Make sure no packets are being processed. This ensures that |
516 | * we have a valid starting sequence number and that in-flight | |
517 | * packets have been flushed out and no packets for this TID | |
518 | * will go into the driver during the ampdu_action call. | |
0ab33703 | 519 | */ |
cfcdbde3 JB |
520 | synchronize_net(); |
521 | ||
69403bad | 522 | sdata = sta->sdata; |
50ea05ef SS |
523 | params.ssn = sta->tid_seq[tid] >> 4; |
524 | ret = drv_ampdu_action(local, sdata, ¶ms); | |
73111efa | 525 | tid_tx->ssn = params.ssn; |
0c197f16 MG |
526 | if (ret == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) { |
527 | return; | |
528 | } else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) { | |
2ce113de JB |
529 | /* |
530 | * We didn't send the request yet, so don't need to check | |
531 | * here if we already got a response, just mark as driver | |
532 | * ready immediately. | |
533 | */ | |
534 | set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state); | |
535 | } else if (ret) { | |
69403bad AW |
536 | if (!sdata) |
537 | return; | |
538 | ||
bdcbd8e0 | 539 | ht_dbg(sdata, |
0a214d3f JB |
540 | "BA request denied - HW unavailable for %pM tid %d\n", |
541 | sta->sta.addr, tid); | |
cfcdbde3 | 542 | spin_lock_bh(&sta->lock); |
3a25a8c8 | 543 | ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
ec034b20 | 544 | ieee80211_assign_tid_tx(sta, tid, NULL); |
3a25a8c8 | 545 | ieee80211_agg_splice_finish(sdata, tid); |
cfcdbde3 JB |
546 | spin_unlock_bh(&sta->lock); |
547 | ||
ba8c3d6f FF |
548 | ieee80211_agg_start_txq(sta, tid, false); |
549 | ||
0744371a | 550 | kfree_rcu(tid_tx, rcu_head); |
0ab33703 JB |
551 | return; |
552 | } | |
553 | ||
31d8bb4e | 554 | ieee80211_send_addba_with_timeout(sta, tid_tx); |
0ab33703 JB |
555 | } |
556 | ||
285fa695 NM |
557 | /* |
558 | * After accepting the AddBA Response we activated a timer, | |
559 | * resetting it after each frame that we send. | |
560 | */ | |
7cca2acd | 561 | static void sta_tx_agg_session_timer_expired(struct timer_list *t) |
285fa695 | 562 | { |
d559e303 JB |
563 | struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer); |
564 | struct sta_info *sta = tid_tx->sta; | |
565 | u8 tid = tid_tx->tid; | |
12d3952f FF |
566 | unsigned long timeout; |
567 | ||
d559e303 | 568 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
12d3952f | 569 | return; |
9e73dee7 | 570 | } |
12d3952f FF |
571 | |
572 | timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); | |
573 | if (time_is_after_jiffies(timeout)) { | |
574 | mod_timer(&tid_tx->session_timer, timeout); | |
575 | return; | |
576 | } | |
285fa695 | 577 | |
0a214d3f | 578 | ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
7cca2acd | 579 | sta->sta.addr, tid); |
285fa695 | 580 | |
7cca2acd | 581 | ieee80211_stop_tx_ba_session(&sta->sta, tid); |
285fa695 NM |
582 | } |
583 | ||
bd2ce6e4 SM |
584 | int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
585 | u16 timeout) | |
b8695a8f | 586 | { |
c951ad35 JB |
587 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
588 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
589 | struct ieee80211_local *local = sdata->local; | |
a622ab72 | 590 | struct tid_ampdu_tx *tid_tx; |
e4e72fb4 | 591 | int ret = 0; |
b8695a8f | 592 | |
8f9c77fc JB |
593 | trace_api_start_tx_ba_session(pubsta, tid); |
594 | ||
b6da911b LK |
595 | if (WARN(sta->reserved_tid == tid, |
596 | "Requested to start BA session on reserved tid=%d", tid)) | |
597 | return -EINVAL; | |
598 | ||
046d2e7c | 599 | if (!pubsta->deflink.ht_cap.ht_supported && |
93382a0d | 600 | sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ) |
8f9c77fc | 601 | return -EINVAL; |
b5878a2d | 602 | |
50c16e22 | 603 | if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
23e6a7ea JB |
604 | return -EINVAL; |
605 | ||
5a306f58 | 606 | if ((tid >= IEEE80211_NUM_TIDS) || |
30686bf7 JB |
607 | !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
608 | ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) | |
b8695a8f JB |
609 | return -EINVAL; |
610 | ||
85d5313e JB |
611 | if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
612 | return -EINVAL; | |
613 | ||
bdcbd8e0 JB |
614 | ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
615 | pubsta->addr, tid); | |
b8695a8f | 616 | |
c951ad35 | 617 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 618 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
c951ad35 | 619 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
620 | sdata->vif.type != NL80211_IFTYPE_AP && |
621 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
c951ad35 | 622 | return -EINVAL; |
8abd3f9b | 623 | |
c2c98fde | 624 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
bdcbd8e0 | 625 | ht_dbg(sdata, |
0a214d3f JB |
626 | "BA sessions blocked - Denying BA session request %pM tid %d\n", |
627 | sta->sta.addr, tid); | |
c951ad35 | 628 | return -EINVAL; |
722f069a S |
629 | } |
630 | ||
a6bce782 JB |
631 | if (test_sta_flag(sta, WLAN_STA_MFP) && |
632 | !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { | |
633 | ht_dbg(sdata, | |
634 | "MFP STA not authorized - deny BA session request %pM tid %d\n", | |
635 | sta->sta.addr, tid); | |
636 | return -EINVAL; | |
637 | } | |
638 | ||
ff3cc5f4 SW |
639 | /* |
640 | * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a | |
641 | * member of an IBSS, and has no other existing Block Ack agreement | |
642 | * with the recipient STA, then the initiating STA shall transmit a | |
643 | * Probe Request frame to the recipient STA and shall not transmit an | |
644 | * ADDBA Request frame unless it receives a Probe Response frame | |
645 | * from the recipient within dot11ADDBAFailureTimeout. | |
646 | * | |
647 | * The probe request mechanism for ADDBA is currently not implemented, | |
648 | * but we only build up Block Ack session with HT STAs. This information | |
649 | * is set when we receive a bss info from a probe response or a beacon. | |
650 | */ | |
651 | if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
046d2e7c | 652 | !sta->sta.deflink.ht_cap.ht_supported) { |
bdcbd8e0 JB |
653 | ht_dbg(sdata, |
654 | "BA request denied - IBSS STA %pM does not advertise HT support\n", | |
655 | pubsta->addr); | |
ff3cc5f4 SW |
656 | return -EINVAL; |
657 | } | |
658 | ||
b8695a8f JB |
659 | spin_lock_bh(&sta->lock); |
660 | ||
661 | /* we have tried too many times, receiver does not want A-MPDU */ | |
662 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { | |
663 | ret = -EBUSY; | |
84381b4e NM |
664 | goto err_unlock_sta; |
665 | } | |
666 | ||
667 | /* | |
668 | * if we have tried more than HT_AGG_BURST_RETRIES times we | |
669 | * will spread our requests in time to avoid stalling connection | |
670 | * for too long | |
671 | */ | |
672 | if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && | |
673 | time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + | |
674 | HT_AGG_RETRIES_PERIOD)) { | |
bdcbd8e0 | 675 | ht_dbg(sdata, |
d81b0fd0 | 676 | "BA request denied - %d failed requests on %pM tid %u\n", |
0a214d3f | 677 | sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); |
84381b4e | 678 | ret = -EBUSY; |
b8695a8f JB |
679 | goto err_unlock_sta; |
680 | } | |
681 | ||
40b275b6 | 682 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
b8695a8f | 683 | /* check if the TID is not in aggregation flow already */ |
ec034b20 | 684 | if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
bdcbd8e0 | 685 | ht_dbg(sdata, |
0a214d3f JB |
686 | "BA request denied - session is not idle on %pM tid %u\n", |
687 | sta->sta.addr, tid); | |
b8695a8f JB |
688 | ret = -EAGAIN; |
689 | goto err_unlock_sta; | |
690 | } | |
691 | ||
692 | /* prepare A-MPDU MLME for Tx aggregation */ | |
a622ab72 JB |
693 | tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
694 | if (!tid_tx) { | |
b8695a8f | 695 | ret = -ENOMEM; |
0ab33703 | 696 | goto err_unlock_sta; |
b8695a8f | 697 | } |
96f5e66e | 698 | |
a622ab72 | 699 | skb_queue_head_init(&tid_tx->pending); |
0ab33703 | 700 | __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
cd8ffc80 | 701 | |
bd2ce6e4 | 702 | tid_tx->timeout = timeout; |
7cca2acd KC |
703 | tid_tx->sta = sta; |
704 | tid_tx->tid = tid; | |
bd2ce6e4 | 705 | |
285fa695 | 706 | /* response timer */ |
7cca2acd | 707 | timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0); |
b8695a8f | 708 | |
285fa695 | 709 | /* tx timer */ |
7cca2acd KC |
710 | timer_setup(&tid_tx->session_timer, |
711 | sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE); | |
285fa695 | 712 | |
0ab33703 | 713 | /* assign a dialog token */ |
b8695a8f | 714 | sta->ampdu_mlme.dialog_token_allocator++; |
a622ab72 | 715 | tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
b8695a8f | 716 | |
ec034b20 JB |
717 | /* |
718 | * Finally, assign it to the start array; the work item will | |
719 | * collect it and move it to the normal array. | |
720 | */ | |
721 | sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; | |
51a0d38d | 722 | |
0ab33703 | 723 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
b8695a8f | 724 | |
0ab33703 | 725 | /* this flow continues off the work */ |
96f5e66e | 726 | err_unlock_sta: |
b8695a8f | 727 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
728 | return ret; |
729 | } | |
730 | EXPORT_SYMBOL(ieee80211_start_tx_ba_session); | |
731 | ||
b1720231 JB |
732 | static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
733 | struct sta_info *sta, u16 tid) | |
734 | { | |
40b275b6 | 735 | struct tid_ampdu_tx *tid_tx; |
50ea05ef SS |
736 | struct ieee80211_ampdu_params params = { |
737 | .sta = &sta->sta, | |
738 | .action = IEEE80211_AMPDU_TX_OPERATIONAL, | |
739 | .tid = tid, | |
740 | .timeout = 0, | |
741 | .ssn = 0, | |
742 | }; | |
40b275b6 | 743 | |
cfcdbde3 | 744 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
a622ab72 | 745 | |
40b275b6 | 746 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
50ea05ef SS |
747 | params.buf_size = tid_tx->buf_size; |
748 | params.amsdu = tid_tx->amsdu; | |
40b275b6 | 749 | |
0a214d3f JB |
750 | ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
751 | sta->sta.addr, tid); | |
b1720231 | 752 | |
50ea05ef | 753 | drv_ampdu_action(local, sta->sdata, ¶ms); |
cfcdbde3 JB |
754 | |
755 | /* | |
756 | * synchronize with TX path, while splicing the TX path | |
757 | * should block so it won't put more packets onto pending. | |
758 | */ | |
759 | spin_lock_bh(&sta->lock); | |
760 | ||
3a25a8c8 | 761 | ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
cd8ffc80 | 762 | /* |
a622ab72 JB |
763 | * Now mark as operational. This will be visible |
764 | * in the TX path, and lets it go lock-free in | |
765 | * the common case. | |
cd8ffc80 | 766 | */ |
40b275b6 | 767 | set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
3a25a8c8 | 768 | ieee80211_agg_splice_finish(sta->sdata, tid); |
b1720231 | 769 | |
cfcdbde3 | 770 | spin_unlock_bh(&sta->lock); |
ba8c3d6f FF |
771 | |
772 | ieee80211_agg_start_txq(sta, tid, true); | |
b1720231 JB |
773 | } |
774 | ||
7a7c0a64 JB |
775 | void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, |
776 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 777 | { |
7a7c0a64 | 778 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
c951ad35 | 779 | struct ieee80211_local *local = sdata->local; |
b8695a8f | 780 | |
7a7c0a64 JB |
781 | if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
782 | return; | |
783 | ||
0c197f16 MG |
784 | if (!test_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)) { |
785 | ieee80211_send_addba_with_timeout(sta, tid_tx); | |
786 | /* RESPONSE_RECEIVED state whould trigger the flow again */ | |
787 | return; | |
788 | } | |
789 | ||
7a7c0a64 JB |
790 | if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
791 | ieee80211_agg_tx_operational(local, sta, tid); | |
792 | } | |
793 | ||
794 | static struct tid_ampdu_tx * | |
795 | ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata, | |
796 | const u8 *ra, u16 tid, struct sta_info **sta) | |
797 | { | |
798 | struct tid_ampdu_tx *tid_tx; | |
b5878a2d | 799 | |
5a306f58 | 800 | if (tid >= IEEE80211_NUM_TIDS) { |
bdcbd8e0 | 801 | ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
5a306f58 | 802 | tid, IEEE80211_NUM_TIDS); |
7a7c0a64 | 803 | return NULL; |
b8695a8f JB |
804 | } |
805 | ||
7a7c0a64 JB |
806 | *sta = sta_info_get_bss(sdata, ra); |
807 | if (!*sta) { | |
bdcbd8e0 | 808 | ht_dbg(sdata, "Could not find station: %pM\n", ra); |
7a7c0a64 | 809 | return NULL; |
b8695a8f JB |
810 | } |
811 | ||
7a7c0a64 | 812 | tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]); |
b8695a8f | 813 | |
7a7c0a64 | 814 | if (WARN_ON(!tid_tx)) |
bdcbd8e0 | 815 | ht_dbg(sdata, "addBA was not requested!\n"); |
96f5e66e | 816 | |
7a7c0a64 | 817 | return tid_tx; |
b8695a8f | 818 | } |
b8695a8f | 819 | |
c951ad35 | 820 | void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
86ab6c5a JB |
821 | const u8 *ra, u16 tid) |
822 | { | |
c951ad35 JB |
823 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
824 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
825 | struct sta_info *sta; |
826 | struct tid_ampdu_tx *tid_tx; | |
86ab6c5a | 827 | |
7a7c0a64 | 828 | trace_api_start_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 829 | |
7a7c0a64 JB |
830 | rcu_read_lock(); |
831 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
832 | if (!tid_tx) | |
833 | goto out; | |
86ab6c5a | 834 | |
7a7c0a64 JB |
835 | set_bit(HT_AGG_STATE_START_CB, &tid_tx->state); |
836 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
837 | out: | |
838 | rcu_read_unlock(); | |
86ab6c5a JB |
839 | } |
840 | EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); | |
841 | ||
849b7967 | 842 | int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
c82c4a80 | 843 | enum ieee80211_agg_stop_reason reason) |
849b7967 | 844 | { |
849b7967 JB |
845 | int ret; |
846 | ||
cfcdbde3 | 847 | mutex_lock(&sta->ampdu_mlme.mtx); |
849b7967 | 848 | |
c82c4a80 | 849 | ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
849b7967 | 850 | |
cfcdbde3 JB |
851 | mutex_unlock(&sta->ampdu_mlme.mtx); |
852 | ||
849b7967 JB |
853 | return ret; |
854 | } | |
b8695a8f | 855 | |
6a8579d0 | 856 | int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
b8695a8f | 857 | { |
c951ad35 JB |
858 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
859 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
860 | struct ieee80211_local *local = sdata->local; | |
0ab33703 JB |
861 | struct tid_ampdu_tx *tid_tx; |
862 | int ret = 0; | |
b8695a8f | 863 | |
6a8579d0 | 864 | trace_api_stop_tx_ba_session(pubsta, tid); |
b5878a2d | 865 | |
4253119a | 866 | if (!local->ops->ampdu_action) |
23e6a7ea JB |
867 | return -EINVAL; |
868 | ||
5a306f58 | 869 | if (tid >= IEEE80211_NUM_TIDS) |
b8695a8f JB |
870 | return -EINVAL; |
871 | ||
0ab33703 | 872 | spin_lock_bh(&sta->lock); |
40b275b6 | 873 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
0ab33703 JB |
874 | |
875 | if (!tid_tx) { | |
876 | ret = -ENOENT; | |
877 | goto unlock; | |
878 | } | |
879 | ||
b6da911b LK |
880 | WARN(sta->reserved_tid == tid, |
881 | "Requested to stop BA session on reserved tid=%d", tid); | |
882 | ||
0ab33703 JB |
883 | if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
884 | /* already in progress stopping it */ | |
885 | ret = 0; | |
886 | goto unlock; | |
887 | } | |
888 | ||
889 | set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); | |
890 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
891 | ||
892 | unlock: | |
893 | spin_unlock_bh(&sta->lock); | |
894 | return ret; | |
b8695a8f JB |
895 | } |
896 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); | |
897 | ||
7a7c0a64 JB |
898 | void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, |
899 | struct tid_ampdu_tx *tid_tx) | |
b8695a8f | 900 | { |
7a7c0a64 | 901 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
2c158887 | 902 | bool send_delba = false; |
06c41bda | 903 | bool start_txq = false; |
b8695a8f | 904 | |
7a7c0a64 JB |
905 | ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", |
906 | sta->sta.addr, tid); | |
b8695a8f | 907 | |
a622ab72 | 908 | spin_lock_bh(&sta->lock); |
a622ab72 | 909 | |
7a7c0a64 | 910 | if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
0a214d3f JB |
911 | ht_dbg(sdata, |
912 | "unexpected callback to A-MPDU stop for %pM tid %d\n", | |
913 | sta->sta.addr, tid); | |
cfcdbde3 | 914 | goto unlock_sta; |
b8695a8f JB |
915 | } |
916 | ||
53f73c09 | 917 | if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
2c158887 | 918 | send_delba = true; |
b8695a8f | 919 | |
faec12ee | 920 | ieee80211_remove_tid_tx(sta, tid); |
06c41bda | 921 | start_txq = true; |
b8695a8f | 922 | |
cfcdbde3 | 923 | unlock_sta: |
a622ab72 | 924 | spin_unlock_bh(&sta->lock); |
2c158887 | 925 | |
06c41bda JB |
926 | if (start_txq) |
927 | ieee80211_agg_start_txq(sta, tid, false); | |
928 | ||
2c158887 | 929 | if (send_delba) |
7a7c0a64 | 930 | ieee80211_send_delba(sdata, sta->sta.addr, tid, |
2c158887 | 931 | WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
b8695a8f | 932 | } |
b8695a8f | 933 | |
c951ad35 | 934 | void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
b8695a8f JB |
935 | const u8 *ra, u16 tid) |
936 | { | |
c951ad35 JB |
937 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
938 | struct ieee80211_local *local = sdata->local; | |
7a7c0a64 JB |
939 | struct sta_info *sta; |
940 | struct tid_ampdu_tx *tid_tx; | |
b8695a8f | 941 | |
7a7c0a64 | 942 | trace_api_stop_tx_ba_cb(sdata, ra, tid); |
d15b8459 | 943 | |
7a7c0a64 JB |
944 | rcu_read_lock(); |
945 | tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); | |
946 | if (!tid_tx) | |
947 | goto out; | |
b8695a8f | 948 | |
7a7c0a64 JB |
949 | set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state); |
950 | ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); | |
951 | out: | |
952 | rcu_read_unlock(); | |
b8695a8f JB |
953 | } |
954 | EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); | |
955 | ||
86ab6c5a | 956 | |
b8695a8f JB |
957 | void ieee80211_process_addba_resp(struct ieee80211_local *local, |
958 | struct sta_info *sta, | |
959 | struct ieee80211_mgmt *mgmt, | |
960 | size_t len) | |
961 | { | |
a622ab72 | 962 | struct tid_ampdu_tx *tid_tx; |
6e0456b5 | 963 | struct ieee80211_txq *txq; |
41cbb0f5 | 964 | u16 capab, tid, buf_size; |
e3abc8ff | 965 | bool amsdu; |
b8695a8f JB |
966 | |
967 | capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); | |
e3abc8ff | 968 | amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
db8ebd06 JB |
969 | tid = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_TID_MASK); |
970 | buf_size = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); | |
ac062197 | 971 | buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
b8695a8f | 972 | |
6e0456b5 FF |
973 | txq = sta->sta.txq[tid]; |
974 | if (!amsdu && txq) | |
975 | set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); | |
976 | ||
cfcdbde3 | 977 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 978 | |
40b275b6 | 979 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
a622ab72 | 980 | if (!tid_tx) |
8ade0082 | 981 | goto out; |
b8695a8f | 982 | |
a622ab72 | 983 | if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
0a214d3f JB |
984 | ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
985 | sta->sta.addr, tid); | |
8ade0082 | 986 | goto out; |
b8695a8f JB |
987 | } |
988 | ||
d305a655 | 989 | del_timer_sync(&tid_tx->addba_resp_timer); |
8ade0082 | 990 | |
0a214d3f JB |
991 | ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
992 | sta->sta.addr, tid); | |
d305a655 NM |
993 | |
994 | /* | |
995 | * addba_resp_timer may have fired before we got here, and | |
996 | * caused WANT_STOP to be set. If the stop then was already | |
997 | * processed further, STOPPING might be set. | |
998 | */ | |
999 | if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || | |
1000 | test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { | |
bdcbd8e0 | 1001 | ht_dbg(sta->sdata, |
0a214d3f JB |
1002 | "got addBA resp for %pM tid %d but we already gave up\n", |
1003 | sta->sta.addr, tid); | |
d305a655 NM |
1004 | goto out; |
1005 | } | |
1006 | ||
3ca97880 HS |
1007 | /* |
1008 | * IEEE 802.11-2007 7.3.1.14: | |
1009 | * In an ADDBA Response frame, when the Status Code field | |
1010 | * is set to 0, the Buffer Size subfield is set to a value | |
1011 | * of at least 1. | |
1012 | */ | |
b8695a8f | 1013 | if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
3ca97880 | 1014 | == WLAN_STATUS_SUCCESS && buf_size) { |
a622ab72 JB |
1015 | if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
1016 | &tid_tx->state)) { | |
1017 | /* ignore duplicate response */ | |
1018 | goto out; | |
1019 | } | |
b8695a8f | 1020 | |
0b01f030 | 1021 | tid_tx->buf_size = buf_size; |
e3abc8ff | 1022 | tid_tx->amsdu = amsdu; |
0b01f030 | 1023 | |
a622ab72 | 1024 | if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
b1720231 | 1025 | ieee80211_agg_tx_operational(local, sta, tid); |
b8695a8f | 1026 | |
b1720231 | 1027 | sta->ampdu_mlme.addba_req_num[tid] = 0; |
285fa695 | 1028 | |
914eac24 SS |
1029 | tid_tx->timeout = |
1030 | le16_to_cpu(mgmt->u.action.u.addba_resp.timeout); | |
1031 | ||
12d3952f | 1032 | if (tid_tx->timeout) { |
285fa695 NM |
1033 | mod_timer(&tid_tx->session_timer, |
1034 | TU_TO_EXP_TIME(tid_tx->timeout)); | |
12d3952f FF |
1035 | tid_tx->last_tx = jiffies; |
1036 | } | |
285fa695 | 1037 | |
b8695a8f | 1038 | } else { |
c82c4a80 | 1039 | ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
b8695a8f | 1040 | } |
2171abc5 | 1041 | |
2171abc5 | 1042 | out: |
cfcdbde3 | 1043 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f | 1044 | } |