Commit | Line | Data |
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b203ffc3 JM |
1 | /* |
2 | * Off-channel operation helpers | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
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 | */ | |
bc3b2d7f | 15 | #include <linux/export.h> |
b203ffc3 JM |
16 | #include <net/mac80211.h> |
17 | #include "ieee80211_i.h" | |
2eb278e0 | 18 | #include "driver-ops.h" |
b203ffc3 JM |
19 | |
20 | /* | |
b23b025f BG |
21 | * Tell our hardware to disable PS. |
22 | * Optionally inform AP that we will go to sleep so that it will buffer | |
23 | * the frames while we are doing off-channel work. This is optional | |
24 | * because we *may* be doing work on-operating channel, and want our | |
25 | * hardware unconditionally awake, but still let the AP send us normal frames. | |
b203ffc3 | 26 | */ |
559cef99 | 27 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) |
b203ffc3 JM |
28 | { |
29 | struct ieee80211_local *local = sdata->local; | |
4730d597 | 30 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
31 | |
32 | local->offchannel_ps_enabled = false; | |
33 | ||
34 | /* FIXME: what to do when local->pspolling is true? */ | |
35 | ||
36 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 37 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
38 | del_timer_sync(&ifmgd->conn_mon_timer); |
39 | ||
b203ffc3 JM |
40 | cancel_work_sync(&local->dynamic_ps_enable_work); |
41 | ||
42 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
43 | local->offchannel_ps_enabled = true; | |
44 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
45 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
46 | } | |
47 | ||
559cef99 | 48 | if (!local->offchannel_ps_enabled || |
30686bf7 | 49 | !ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) |
b203ffc3 JM |
50 | /* |
51 | * If power save was enabled, no need to send a nullfunc | |
52 | * frame because AP knows that we are sleeping. But if the | |
53 | * hardware is creating the nullfunc frame for power save | |
54 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
55 | * enabled) and power save was enabled, the firmware just | |
56 | * sent a null frame with power save disabled. So we need | |
57 | * to send a new nullfunc frame to inform the AP that we | |
58 | * are again sleeping. | |
59 | */ | |
076cdcb1 | 60 | ieee80211_send_nullfunc(local, sdata, true); |
b203ffc3 JM |
61 | } |
62 | ||
63 | /* inform AP that we are awake again, unless power save is enabled */ | |
64 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
65 | { | |
66 | struct ieee80211_local *local = sdata->local; | |
67 | ||
68 | if (!local->ps_sdata) | |
076cdcb1 | 69 | ieee80211_send_nullfunc(local, sdata, false); |
b203ffc3 JM |
70 | else if (local->offchannel_ps_enabled) { |
71 | /* | |
72 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
73 | * will send a nullfunc frame with the powersave bit set | |
74 | * even though the AP already knows that we are sleeping. | |
75 | * This could be avoided by sending a null frame with power | |
76 | * save bit disabled before enabling the power save, but | |
77 | * this doesn't gain anything. | |
78 | * | |
79 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
80 | * to send a nullfunc frame because AP already knows that | |
81 | * we are sleeping, let's just enable power save mode in | |
82 | * hardware. | |
83 | */ | |
b23b025f BG |
84 | /* TODO: Only set hardware if CONF_PS changed? |
85 | * TODO: Should we set offchannel_ps_enabled to false? | |
86 | */ | |
b203ffc3 JM |
87 | local->hw.conf.flags |= IEEE80211_CONF_PS; |
88 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
89 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
90 | /* | |
91 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
92 | * had been running before leaving the operating channel, | |
93 | * restart the timer now and send a nullfunc frame to inform | |
94 | * the AP that we are awake. | |
95 | */ | |
076cdcb1 | 96 | ieee80211_send_nullfunc(local, sdata, false); |
b203ffc3 JM |
97 | mod_timer(&local->dynamic_ps_timer, jiffies + |
98 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
99 | } | |
4730d597 | 100 | |
3bc3c0d7 | 101 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 102 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
103 | } |
104 | ||
aacde9ee | 105 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local) |
b203ffc3 JM |
106 | { |
107 | struct ieee80211_sub_if_data *sdata; | |
108 | ||
fe57d9f5 JB |
109 | if (WARN_ON(local->use_chanctx)) |
110 | return; | |
111 | ||
b23b025f BG |
112 | /* |
113 | * notify the AP about us leaving the channel and stop all | |
114 | * STA interfaces. | |
115 | */ | |
6c17b77b | 116 | |
9c35d7d2 SF |
117 | /* |
118 | * Stop queues and transmit all frames queued by the driver | |
119 | * before sending nullfunc to enable powersave at the AP. | |
120 | */ | |
445ea4e8 | 121 | ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, |
cca07b00 LC |
122 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL, |
123 | false); | |
3b24f4c6 | 124 | ieee80211_flush_queues(local, NULL, false); |
6c17b77b | 125 | |
b203ffc3 JM |
126 | mutex_lock(&local->iflist_mtx); |
127 | list_for_each_entry(sdata, &local->interfaces, list) { | |
128 | if (!ieee80211_sdata_running(sdata)) | |
129 | continue; | |
130 | ||
f142c6b9 JB |
131 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
132 | continue; | |
133 | ||
b23b025f BG |
134 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
135 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
136 | ||
137 | /* Check to see if we should disable beaconing. */ | |
d6a83228 JB |
138 | if (sdata->vif.bss_conf.enable_beacon) { |
139 | set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, | |
140 | &sdata->state); | |
141 | sdata->vif.bss_conf.enable_beacon = false; | |
b203ffc3 JM |
142 | ieee80211_bss_info_change_notify( |
143 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 144 | } |
b203ffc3 | 145 | |
6c17b77b SF |
146 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
147 | sdata->u.mgd.associated) | |
148 | ieee80211_offchannel_ps_enable(sdata); | |
b203ffc3 JM |
149 | } |
150 | mutex_unlock(&local->iflist_mtx); | |
151 | } | |
152 | ||
aacde9ee | 153 | void ieee80211_offchannel_return(struct ieee80211_local *local) |
b203ffc3 JM |
154 | { |
155 | struct ieee80211_sub_if_data *sdata; | |
156 | ||
fe57d9f5 JB |
157 | if (WARN_ON(local->use_chanctx)) |
158 | return; | |
159 | ||
b203ffc3 JM |
160 | mutex_lock(&local->iflist_mtx); |
161 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f142c6b9 JB |
162 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
163 | continue; | |
164 | ||
f6e8cb72 EP |
165 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
166 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
167 | ||
b203ffc3 JM |
168 | if (!ieee80211_sdata_running(sdata)) |
169 | continue; | |
170 | ||
171 | /* Tell AP we're back */ | |
aacde9ee SG |
172 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
173 | sdata->u.mgd.associated) | |
174 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 | 175 | |
d6a83228 JB |
176 | if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, |
177 | &sdata->state)) { | |
178 | sdata->vif.bss_conf.enable_beacon = true; | |
b203ffc3 JM |
179 | ieee80211_bss_info_change_notify( |
180 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 181 | } |
b203ffc3 JM |
182 | } |
183 | mutex_unlock(&local->iflist_mtx); | |
6c17b77b | 184 | |
445ea4e8 | 185 | ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, |
cca07b00 LC |
186 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL, |
187 | false); | |
b203ffc3 | 188 | } |
21f83589 | 189 | |
aaa016cc | 190 | static void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) |
2eb278e0 | 191 | { |
aaa016cc JB |
192 | /* was never transmitted */ |
193 | if (roc->frame) { | |
194 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, roc->mgmt_tx_cookie, | |
195 | roc->frame->data, roc->frame->len, | |
196 | false, GFP_KERNEL); | |
197 | ieee80211_free_txskb(&roc->sdata->local->hw, roc->frame); | |
198 | } | |
199 | ||
200 | if (!roc->mgmt_tx_cookie) | |
201 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, | |
202 | roc->cookie, roc->chan, | |
203 | GFP_KERNEL); | |
204 | ||
205 | list_del(&roc->list); | |
206 | kfree(roc); | |
207 | } | |
208 | ||
209 | static unsigned long ieee80211_end_finished_rocs(struct ieee80211_local *local, | |
210 | unsigned long now) | |
211 | { | |
212 | struct ieee80211_roc_work *roc, *tmp; | |
213 | long remaining_dur_min = LONG_MAX; | |
214 | ||
215 | lockdep_assert_held(&local->mtx); | |
216 | ||
217 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
218 | long remaining; | |
219 | ||
220 | if (!roc->started) | |
221 | break; | |
222 | ||
223 | remaining = roc->start_time + | |
224 | msecs_to_jiffies(roc->duration) - | |
225 | now; | |
226 | ||
227 | if (roc->abort || remaining <= 0) | |
228 | ieee80211_roc_notify_destroy(roc); | |
229 | else | |
230 | remaining_dur_min = min(remaining_dur_min, remaining); | |
231 | } | |
232 | ||
233 | return remaining_dur_min; | |
234 | } | |
235 | ||
236 | static bool ieee80211_recalc_sw_work(struct ieee80211_local *local, | |
237 | unsigned long now) | |
238 | { | |
239 | long dur = ieee80211_end_finished_rocs(local, now); | |
240 | ||
241 | if (dur == LONG_MAX) | |
242 | return false; | |
243 | ||
244 | mod_delayed_work(local->workqueue, &local->roc_work, dur); | |
245 | return true; | |
246 | } | |
247 | ||
248 | static void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc, | |
249 | unsigned long start_time) | |
250 | { | |
251 | struct ieee80211_local *local = roc->sdata->local; | |
252 | ||
253 | if (WARN_ON(roc->notified)) | |
2eb278e0 JB |
254 | return; |
255 | ||
aaa016cc JB |
256 | roc->start_time = start_time; |
257 | roc->started = true; | |
258 | roc->hw_begun = true; | |
259 | ||
2eb278e0 JB |
260 | if (roc->mgmt_tx_cookie) { |
261 | if (!WARN_ON(!roc->frame)) { | |
55de908a JB |
262 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
263 | roc->chan->band); | |
2eb278e0 JB |
264 | roc->frame = NULL; |
265 | } | |
266 | } else { | |
50febf6a | 267 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
42d97a59 JB |
268 | roc->chan, roc->req_duration, |
269 | GFP_KERNEL); | |
2eb278e0 JB |
270 | } |
271 | ||
272 | roc->notified = true; | |
aaa016cc JB |
273 | |
274 | if (!local->ops->remain_on_channel) | |
275 | ieee80211_recalc_sw_work(local, start_time); | |
2eb278e0 JB |
276 | } |
277 | ||
21f83589 JB |
278 | static void ieee80211_hw_roc_start(struct work_struct *work) |
279 | { | |
280 | struct ieee80211_local *local = | |
281 | container_of(work, struct ieee80211_local, hw_roc_start); | |
aaa016cc | 282 | struct ieee80211_roc_work *roc; |
21f83589 JB |
283 | |
284 | mutex_lock(&local->mtx); | |
285 | ||
aaa016cc JB |
286 | list_for_each_entry(roc, &local->roc_list, list) { |
287 | if (!roc->started) | |
288 | break; | |
2eb278e0 | 289 | |
aaa016cc | 290 | ieee80211_handle_roc_started(roc, local->hw_roc_start_time); |
2eb278e0 | 291 | } |
aaa016cc | 292 | |
21f83589 JB |
293 | mutex_unlock(&local->mtx); |
294 | } | |
295 | ||
296 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
297 | { | |
298 | struct ieee80211_local *local = hw_to_local(hw); | |
299 | ||
2eb278e0 JB |
300 | local->hw_roc_start_time = jiffies; |
301 | ||
21f83589 JB |
302 | trace_api_ready_on_channel(local); |
303 | ||
304 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
305 | } | |
306 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
307 | ||
aaa016cc | 308 | static void _ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 309 | { |
aaa016cc JB |
310 | struct ieee80211_roc_work *roc, *tmp; |
311 | enum ieee80211_roc_type type; | |
312 | u32 min_dur, max_dur; | |
21f83589 | 313 | |
2eb278e0 | 314 | lockdep_assert_held(&local->mtx); |
21f83589 | 315 | |
aaa016cc | 316 | if (WARN_ON(list_empty(&local->roc_list))) |
21f83589 | 317 | return; |
21f83589 | 318 | |
2eb278e0 JB |
319 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
320 | list); | |
71ecfa18 | 321 | |
aaa016cc | 322 | if (WARN_ON(roc->started)) |
0f6b3f59 JB |
323 | return; |
324 | ||
aaa016cc JB |
325 | min_dur = roc->duration; |
326 | max_dur = roc->duration; | |
327 | type = roc->type; | |
71ecfa18 | 328 | |
aaa016cc JB |
329 | list_for_each_entry(tmp, &local->roc_list, list) { |
330 | if (tmp == roc) | |
331 | continue; | |
332 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
333 | break; | |
334 | max_dur = max(tmp->duration, max_dur); | |
335 | min_dur = min(tmp->duration, min_dur); | |
336 | type = max(tmp->type, type); | |
337 | } | |
2eb278e0 | 338 | |
aaa016cc JB |
339 | if (local->ops->remain_on_channel) { |
340 | int ret = drv_remain_on_channel(local, roc->sdata, roc->chan, | |
341 | max_dur, type); | |
2eb278e0 JB |
342 | |
343 | if (ret) { | |
344 | wiphy_warn(local->hw.wiphy, | |
345 | "failed to start next HW ROC (%d)\n", ret); | |
346 | /* | |
347 | * queue the work struct again to avoid recursion | |
348 | * when multiple failures occur | |
349 | */ | |
aaa016cc JB |
350 | list_for_each_entry(tmp, &local->roc_list, list) { |
351 | if (tmp->sdata != roc->sdata || | |
352 | tmp->chan != roc->chan) | |
353 | break; | |
354 | tmp->started = true; | |
355 | tmp->abort = true; | |
356 | } | |
357 | ieee80211_queue_work(&local->hw, &local->hw_roc_done); | |
358 | return; | |
2eb278e0 | 359 | } |
b4b177a5 | 360 | |
aaa016cc JB |
361 | /* we'll notify about the start once the HW calls back */ |
362 | list_for_each_entry(tmp, &local->roc_list, list) { | |
363 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
364 | break; | |
365 | tmp->started = true; | |
366 | } | |
367 | } else { | |
b4b177a5 JB |
368 | /* If actually operating on the desired channel (with at least |
369 | * 20 MHz channel width) don't stop all the operations but still | |
370 | * treat it as though the ROC operation started properly, so | |
371 | * other ROC operations won't interfere with this one. | |
372 | */ | |
373 | roc->on_channel = roc->chan == local->_oper_chandef.chan && | |
374 | local->_oper_chandef.width != NL80211_CHAN_WIDTH_5 && | |
375 | local->_oper_chandef.width != NL80211_CHAN_WIDTH_10; | |
21f83589 | 376 | |
b4b177a5 | 377 | /* start this ROC */ |
2eb278e0 JB |
378 | ieee80211_recalc_idle(local); |
379 | ||
b4b177a5 JB |
380 | if (!roc->on_channel) { |
381 | ieee80211_offchannel_stop_vifs(local); | |
382 | ||
383 | local->tmp_channel = roc->chan; | |
384 | ieee80211_hw_config(local, 0); | |
385 | } | |
2eb278e0 | 386 | |
aaa016cc JB |
387 | ieee80211_queue_delayed_work(&local->hw, &local->roc_work, |
388 | msecs_to_jiffies(min_dur)); | |
389 | ||
390 | /* tell userspace or send frame(s) */ | |
391 | list_for_each_entry(tmp, &local->roc_list, list) { | |
392 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
393 | break; | |
394 | ||
395 | tmp->on_channel = roc->on_channel; | |
396 | ieee80211_handle_roc_started(tmp, jiffies); | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | void ieee80211_start_next_roc(struct ieee80211_local *local) | |
402 | { | |
403 | struct ieee80211_roc_work *roc; | |
404 | ||
405 | lockdep_assert_held(&local->mtx); | |
406 | ||
407 | if (list_empty(&local->roc_list)) { | |
408 | ieee80211_run_deferred_scan(local); | |
409 | return; | |
410 | } | |
411 | ||
412 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, | |
413 | list); | |
414 | ||
415 | if (WARN_ON_ONCE(roc->started)) | |
416 | return; | |
417 | ||
418 | if (local->ops->remain_on_channel) { | |
419 | _ieee80211_start_next_roc(local); | |
420 | } else { | |
421 | /* delay it a bit */ | |
422 | ieee80211_queue_delayed_work(&local->hw, &local->roc_work, | |
423 | round_jiffies_relative(HZ/2)); | |
424 | } | |
425 | } | |
426 | ||
427 | static void __ieee80211_roc_work(struct ieee80211_local *local) | |
428 | { | |
429 | struct ieee80211_roc_work *roc; | |
430 | bool on_channel; | |
431 | ||
432 | lockdep_assert_held(&local->mtx); | |
433 | ||
434 | if (WARN_ON(local->ops->remain_on_channel)) | |
435 | return; | |
2eb278e0 | 436 | |
aaa016cc JB |
437 | roc = list_first_entry_or_null(&local->roc_list, |
438 | struct ieee80211_roc_work, list); | |
439 | if (!roc) | |
440 | return; | |
2eb278e0 | 441 | |
aaa016cc JB |
442 | if (!roc->started) { |
443 | WARN_ON(local->use_chanctx); | |
444 | _ieee80211_start_next_roc(local); | |
2eb278e0 | 445 | } else { |
b4b177a5 | 446 | on_channel = roc->on_channel; |
aaa016cc JB |
447 | if (ieee80211_recalc_sw_work(local, jiffies)) |
448 | return; | |
2eb278e0 | 449 | |
aaa016cc JB |
450 | /* careful - roc pointer became invalid during recalc */ |
451 | ||
452 | if (!on_channel) { | |
3b24f4c6 | 453 | ieee80211_flush_queues(local, NULL, false); |
2eb278e0 JB |
454 | |
455 | local->tmp_channel = NULL; | |
456 | ieee80211_hw_config(local, 0); | |
457 | ||
aacde9ee | 458 | ieee80211_offchannel_return(local); |
2eb278e0 JB |
459 | } |
460 | ||
461 | ieee80211_recalc_idle(local); | |
aaa016cc | 462 | ieee80211_start_next_roc(local); |
2eb278e0 | 463 | } |
aaa016cc | 464 | } |
2eb278e0 | 465 | |
aaa016cc JB |
466 | static void ieee80211_roc_work(struct work_struct *work) |
467 | { | |
468 | struct ieee80211_local *local = | |
469 | container_of(work, struct ieee80211_local, roc_work.work); | |
470 | ||
471 | mutex_lock(&local->mtx); | |
472 | __ieee80211_roc_work(local); | |
2eb278e0 JB |
473 | mutex_unlock(&local->mtx); |
474 | } | |
475 | ||
476 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
477 | { | |
478 | struct ieee80211_local *local = | |
479 | container_of(work, struct ieee80211_local, hw_roc_done); | |
2eb278e0 JB |
480 | |
481 | mutex_lock(&local->mtx); | |
482 | ||
aaa016cc | 483 | ieee80211_end_finished_rocs(local, jiffies); |
2eb278e0 JB |
484 | |
485 | /* if there's another roc, start it now */ | |
486 | ieee80211_start_next_roc(local); | |
487 | ||
21f83589 JB |
488 | mutex_unlock(&local->mtx); |
489 | } | |
490 | ||
491 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
492 | { | |
493 | struct ieee80211_local *local = hw_to_local(hw); | |
494 | ||
495 | trace_api_remain_on_channel_expired(local); | |
496 | ||
497 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
500 | ||
aaa016cc JB |
501 | static bool |
502 | ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local, | |
503 | struct ieee80211_roc_work *new_roc, | |
504 | struct ieee80211_roc_work *cur_roc) | |
a2fcfccb JB |
505 | { |
506 | unsigned long now = jiffies; | |
aaa016cc JB |
507 | unsigned long remaining; |
508 | ||
509 | if (WARN_ON(!cur_roc->started)) | |
510 | return false; | |
a2fcfccb | 511 | |
aaa016cc JB |
512 | /* if it was scheduled in the hardware, but not started yet, |
513 | * we can only combine if the older one had a longer duration | |
514 | */ | |
515 | if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration) | |
a2fcfccb JB |
516 | return false; |
517 | ||
aaa016cc JB |
518 | remaining = cur_roc->start_time + |
519 | msecs_to_jiffies(cur_roc->duration) - | |
520 | now; | |
521 | ||
a2fcfccb JB |
522 | /* if it doesn't fit entirely, schedule a new one */ |
523 | if (new_roc->duration > jiffies_to_msecs(remaining)) | |
524 | return false; | |
525 | ||
aaa016cc JB |
526 | /* add just after the current one so we combine their finish later */ |
527 | list_add(&new_roc->list, &cur_roc->list); | |
528 | ||
529 | /* if the existing one has already begun then let this one also | |
530 | * begin, otherwise they'll both be marked properly by the work | |
531 | * struct that runs once the driver notifies us of the beginning | |
532 | */ | |
533 | if (cur_roc->hw_begun) | |
534 | ieee80211_handle_roc_started(new_roc, now); | |
a2fcfccb | 535 | |
a2fcfccb JB |
536 | return true; |
537 | } | |
538 | ||
539 | static int ieee80211_start_roc_work(struct ieee80211_local *local, | |
540 | struct ieee80211_sub_if_data *sdata, | |
541 | struct ieee80211_channel *channel, | |
542 | unsigned int duration, u64 *cookie, | |
543 | struct sk_buff *txskb, | |
544 | enum ieee80211_roc_type type) | |
545 | { | |
546 | struct ieee80211_roc_work *roc, *tmp; | |
aaa016cc | 547 | bool queued = false, combine_started = true; |
a2fcfccb JB |
548 | int ret; |
549 | ||
550 | lockdep_assert_held(&local->mtx); | |
551 | ||
552 | if (local->use_chanctx && !local->ops->remain_on_channel) | |
553 | return -EOPNOTSUPP; | |
554 | ||
555 | roc = kzalloc(sizeof(*roc), GFP_KERNEL); | |
556 | if (!roc) | |
557 | return -ENOMEM; | |
558 | ||
559 | /* | |
560 | * If the duration is zero, then the driver | |
561 | * wouldn't actually do anything. Set it to | |
562 | * 10 for now. | |
563 | * | |
564 | * TODO: cancel the off-channel operation | |
565 | * when we get the SKB's TX status and | |
566 | * the wait time was zero before. | |
567 | */ | |
568 | if (!duration) | |
569 | duration = 10; | |
570 | ||
571 | roc->chan = channel; | |
572 | roc->duration = duration; | |
573 | roc->req_duration = duration; | |
574 | roc->frame = txskb; | |
575 | roc->type = type; | |
576 | roc->sdata = sdata; | |
a2fcfccb JB |
577 | |
578 | /* | |
579 | * cookie is either the roc cookie (for normal roc) | |
580 | * or the SKB (for mgmt TX) | |
581 | */ | |
582 | if (!txskb) { | |
583 | roc->cookie = ieee80211_mgmt_tx_cookie(local); | |
584 | *cookie = roc->cookie; | |
585 | } else { | |
586 | roc->mgmt_tx_cookie = *cookie; | |
587 | } | |
588 | ||
aaa016cc JB |
589 | /* if there's no need to queue, handle it immediately */ |
590 | if (list_empty(&local->roc_list) && | |
591 | !local->scanning && !ieee80211_is_radar_required(local)) { | |
592 | /* if not HW assist, just queue & schedule work */ | |
593 | if (!local->ops->remain_on_channel) { | |
594 | list_add_tail(&roc->list, &local->roc_list); | |
595 | ieee80211_queue_delayed_work(&local->hw, | |
596 | &local->roc_work, 0); | |
597 | } else { | |
598 | /* otherwise actually kick it off here | |
599 | * (for error handling) | |
600 | */ | |
601 | ret = drv_remain_on_channel(local, sdata, channel, | |
602 | duration, type); | |
603 | if (ret) { | |
604 | kfree(roc); | |
605 | return ret; | |
606 | } | |
607 | roc->started = true; | |
608 | list_add_tail(&roc->list, &local->roc_list); | |
609 | } | |
a2fcfccb | 610 | |
aaa016cc | 611 | return 0; |
a2fcfccb JB |
612 | } |
613 | ||
aaa016cc | 614 | /* otherwise handle queueing */ |
a2fcfccb | 615 | |
a2fcfccb JB |
616 | list_for_each_entry(tmp, &local->roc_list, list) { |
617 | if (tmp->chan != channel || tmp->sdata != sdata) | |
618 | continue; | |
619 | ||
620 | /* | |
aaa016cc JB |
621 | * Extend this ROC if possible: If it hasn't started, add |
622 | * just after the new one to combine. | |
a2fcfccb JB |
623 | */ |
624 | if (!tmp->started) { | |
aaa016cc | 625 | list_add(&roc->list, &tmp->list); |
a2fcfccb JB |
626 | queued = true; |
627 | break; | |
628 | } | |
629 | ||
aaa016cc JB |
630 | if (!combine_started) |
631 | continue; | |
a2fcfccb | 632 | |
aaa016cc JB |
633 | if (!local->ops->remain_on_channel) { |
634 | /* If there's no hardware remain-on-channel, and | |
635 | * doing so won't push us over the maximum r-o-c | |
636 | * we allow, then we can just add the new one to | |
637 | * the list and mark it as having started now. | |
638 | * If it would push over the limit, don't try to | |
639 | * combine with other started ones (that haven't | |
640 | * been running as long) but potentially sort it | |
641 | * with others that had the same fate. | |
a2fcfccb | 642 | */ |
aaa016cc JB |
643 | unsigned long now = jiffies; |
644 | u32 elapsed = jiffies_to_msecs(now - tmp->start_time); | |
645 | struct wiphy *wiphy = local->hw.wiphy; | |
646 | u32 max_roc = wiphy->max_remain_on_channel_duration; | |
a2fcfccb | 647 | |
aaa016cc JB |
648 | if (elapsed + roc->duration > max_roc) { |
649 | combine_started = false; | |
650 | continue; | |
651 | } | |
a2fcfccb | 652 | |
aaa016cc JB |
653 | list_add(&roc->list, &tmp->list); |
654 | queued = true; | |
655 | roc->on_channel = tmp->on_channel; | |
656 | ieee80211_handle_roc_started(roc, now); | |
657 | break; | |
a2fcfccb | 658 | } |
aaa016cc JB |
659 | |
660 | queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp); | |
661 | if (queued) | |
662 | break; | |
663 | /* if it wasn't queued, perhaps it can be combined with | |
664 | * another that also couldn't get combined previously, | |
665 | * but no need to check for already started ones, since | |
666 | * that can't work. | |
667 | */ | |
668 | combine_started = false; | |
a2fcfccb JB |
669 | } |
670 | ||
a2fcfccb JB |
671 | if (!queued) |
672 | list_add_tail(&roc->list, &local->roc_list); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev, | |
678 | struct ieee80211_channel *chan, | |
679 | unsigned int duration, u64 *cookie) | |
680 | { | |
681 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
682 | struct ieee80211_local *local = sdata->local; | |
683 | int ret; | |
684 | ||
685 | mutex_lock(&local->mtx); | |
686 | ret = ieee80211_start_roc_work(local, sdata, chan, | |
687 | duration, cookie, NULL, | |
688 | IEEE80211_ROC_TYPE_NORMAL); | |
689 | mutex_unlock(&local->mtx); | |
690 | ||
691 | return ret; | |
692 | } | |
693 | ||
694 | static int ieee80211_cancel_roc(struct ieee80211_local *local, | |
695 | u64 cookie, bool mgmt_tx) | |
696 | { | |
697 | struct ieee80211_roc_work *roc, *tmp, *found = NULL; | |
698 | int ret; | |
699 | ||
700 | mutex_lock(&local->mtx); | |
701 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
a2fcfccb JB |
702 | if (!mgmt_tx && roc->cookie != cookie) |
703 | continue; | |
704 | else if (mgmt_tx && roc->mgmt_tx_cookie != cookie) | |
705 | continue; | |
706 | ||
707 | found = roc; | |
708 | break; | |
709 | } | |
710 | ||
711 | if (!found) { | |
712 | mutex_unlock(&local->mtx); | |
713 | return -ENOENT; | |
714 | } | |
715 | ||
aaa016cc JB |
716 | if (!found->started) { |
717 | ieee80211_roc_notify_destroy(found); | |
718 | goto out_unlock; | |
719 | } | |
a2fcfccb JB |
720 | |
721 | if (local->ops->remain_on_channel) { | |
aaa016cc JB |
722 | ret = drv_cancel_remain_on_channel(local); |
723 | if (WARN_ON_ONCE(ret)) { | |
724 | mutex_unlock(&local->mtx); | |
725 | return ret; | |
a2fcfccb JB |
726 | } |
727 | ||
aaa016cc JB |
728 | /* TODO: |
729 | * if multiple items were combined here then we really shouldn't | |
730 | * cancel them all - we should wait for as much time as needed | |
731 | * for the longest remaining one, and only then cancel ... | |
732 | */ | |
733 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
734 | if (!roc->started) | |
735 | break; | |
736 | if (roc == found) | |
737 | found = NULL; | |
738 | ieee80211_roc_notify_destroy(roc); | |
739 | } | |
a2fcfccb | 740 | |
aaa016cc JB |
741 | /* that really must not happen - it was started */ |
742 | WARN_ON(found); | |
a2fcfccb | 743 | |
aaa016cc | 744 | ieee80211_start_next_roc(local); |
a2fcfccb | 745 | } else { |
aaa016cc | 746 | /* go through work struct to return to the operating channel */ |
a2fcfccb | 747 | found->abort = true; |
aaa016cc | 748 | mod_delayed_work(local->workqueue, &local->roc_work, 0); |
a2fcfccb JB |
749 | } |
750 | ||
aaa016cc JB |
751 | out_unlock: |
752 | mutex_unlock(&local->mtx); | |
753 | ||
a2fcfccb JB |
754 | return 0; |
755 | } | |
756 | ||
757 | int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy, | |
758 | struct wireless_dev *wdev, u64 cookie) | |
759 | { | |
760 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
761 | struct ieee80211_local *local = sdata->local; | |
762 | ||
763 | return ieee80211_cancel_roc(local, cookie, false); | |
764 | } | |
765 | ||
766 | int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev, | |
767 | struct cfg80211_mgmt_tx_params *params, u64 *cookie) | |
768 | { | |
769 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
770 | struct ieee80211_local *local = sdata->local; | |
5ee00dbd | 771 | struct sk_buff *skb; |
a2fcfccb JB |
772 | struct sta_info *sta; |
773 | const struct ieee80211_mgmt *mgmt = (void *)params->buf; | |
774 | bool need_offchan = false; | |
775 | u32 flags; | |
776 | int ret; | |
777 | u8 *data; | |
778 | ||
779 | if (params->dont_wait_for_ack) | |
780 | flags = IEEE80211_TX_CTL_NO_ACK; | |
781 | else | |
782 | flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX | | |
783 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
784 | ||
785 | if (params->no_cck) | |
786 | flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
787 | ||
788 | switch (sdata->vif.type) { | |
789 | case NL80211_IFTYPE_ADHOC: | |
790 | if (!sdata->vif.bss_conf.ibss_joined) | |
791 | need_offchan = true; | |
792 | /* fall through */ | |
793 | #ifdef CONFIG_MAC80211_MESH | |
794 | case NL80211_IFTYPE_MESH_POINT: | |
795 | if (ieee80211_vif_is_mesh(&sdata->vif) && | |
796 | !sdata->u.mesh.mesh_id_len) | |
797 | need_offchan = true; | |
798 | /* fall through */ | |
799 | #endif | |
800 | case NL80211_IFTYPE_AP: | |
801 | case NL80211_IFTYPE_AP_VLAN: | |
802 | case NL80211_IFTYPE_P2P_GO: | |
803 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
804 | !ieee80211_vif_is_mesh(&sdata->vif) && | |
805 | !rcu_access_pointer(sdata->bss->beacon)) | |
806 | need_offchan = true; | |
807 | if (!ieee80211_is_action(mgmt->frame_control) || | |
808 | mgmt->u.action.category == WLAN_CATEGORY_PUBLIC || | |
809 | mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED || | |
810 | mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) | |
811 | break; | |
812 | rcu_read_lock(); | |
813 | sta = sta_info_get(sdata, mgmt->da); | |
814 | rcu_read_unlock(); | |
815 | if (!sta) | |
816 | return -ENOLINK; | |
817 | break; | |
818 | case NL80211_IFTYPE_STATION: | |
819 | case NL80211_IFTYPE_P2P_CLIENT: | |
820 | sdata_lock(sdata); | |
821 | if (!sdata->u.mgd.associated || | |
822 | (params->offchan && params->wait && | |
823 | local->ops->remain_on_channel && | |
824 | memcmp(sdata->u.mgd.associated->bssid, | |
825 | mgmt->bssid, ETH_ALEN))) | |
826 | need_offchan = true; | |
827 | sdata_unlock(sdata); | |
828 | break; | |
829 | case NL80211_IFTYPE_P2P_DEVICE: | |
830 | need_offchan = true; | |
831 | break; | |
832 | default: | |
833 | return -EOPNOTSUPP; | |
834 | } | |
835 | ||
836 | /* configurations requiring offchan cannot work if no channel has been | |
837 | * specified | |
838 | */ | |
839 | if (need_offchan && !params->chan) | |
840 | return -EINVAL; | |
841 | ||
842 | mutex_lock(&local->mtx); | |
843 | ||
844 | /* Check if the operating channel is the requested channel */ | |
845 | if (!need_offchan) { | |
846 | struct ieee80211_chanctx_conf *chanctx_conf; | |
847 | ||
848 | rcu_read_lock(); | |
849 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
850 | ||
851 | if (chanctx_conf) { | |
852 | need_offchan = params->chan && | |
853 | (params->chan != | |
854 | chanctx_conf->def.chan); | |
855 | } else if (!params->chan) { | |
856 | ret = -EINVAL; | |
857 | rcu_read_unlock(); | |
858 | goto out_unlock; | |
859 | } else { | |
860 | need_offchan = true; | |
861 | } | |
862 | rcu_read_unlock(); | |
863 | } | |
864 | ||
865 | if (need_offchan && !params->offchan) { | |
866 | ret = -EBUSY; | |
867 | goto out_unlock; | |
868 | } | |
869 | ||
870 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len); | |
871 | if (!skb) { | |
872 | ret = -ENOMEM; | |
873 | goto out_unlock; | |
874 | } | |
875 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
876 | ||
877 | data = skb_put(skb, params->len); | |
878 | memcpy(data, params->buf, params->len); | |
879 | ||
880 | /* Update CSA counters */ | |
881 | if (sdata->vif.csa_active && | |
882 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
883 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT || | |
884 | sdata->vif.type == NL80211_IFTYPE_ADHOC) && | |
885 | params->n_csa_offsets) { | |
886 | int i; | |
887 | struct beacon_data *beacon = NULL; | |
888 | ||
889 | rcu_read_lock(); | |
890 | ||
891 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
892 | beacon = rcu_dereference(sdata->u.ap.beacon); | |
893 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) | |
894 | beacon = rcu_dereference(sdata->u.ibss.presp); | |
895 | else if (ieee80211_vif_is_mesh(&sdata->vif)) | |
896 | beacon = rcu_dereference(sdata->u.mesh.beacon); | |
897 | ||
898 | if (beacon) | |
899 | for (i = 0; i < params->n_csa_offsets; i++) | |
900 | data[params->csa_offsets[i]] = | |
901 | beacon->csa_current_counter; | |
902 | ||
903 | rcu_read_unlock(); | |
904 | } | |
905 | ||
906 | IEEE80211_SKB_CB(skb)->flags = flags; | |
907 | ||
908 | skb->dev = sdata->dev; | |
909 | ||
910 | if (!params->dont_wait_for_ack) { | |
911 | /* make a copy to preserve the frame contents | |
912 | * in case of encryption. | |
913 | */ | |
5ee00dbd JB |
914 | ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL); |
915 | if (ret) { | |
a2fcfccb JB |
916 | kfree_skb(skb); |
917 | goto out_unlock; | |
918 | } | |
919 | } else { | |
920 | /* Assign a dummy non-zero cookie, it's not sent to | |
921 | * userspace in this case but we rely on its value | |
922 | * internally in the need_offchan case to distinguish | |
923 | * mgmt-tx from remain-on-channel. | |
924 | */ | |
925 | *cookie = 0xffffffff; | |
926 | } | |
927 | ||
928 | if (!need_offchan) { | |
929 | ieee80211_tx_skb(sdata, skb); | |
930 | ret = 0; | |
931 | goto out_unlock; | |
932 | } | |
933 | ||
934 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN | | |
935 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
936 | if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) | |
937 | IEEE80211_SKB_CB(skb)->hw_queue = | |
938 | local->hw.offchannel_tx_hw_queue; | |
939 | ||
940 | /* This will handle all kinds of coalescing and immediate TX */ | |
941 | ret = ieee80211_start_roc_work(local, sdata, params->chan, | |
942 | params->wait, cookie, skb, | |
943 | IEEE80211_ROC_TYPE_MGMT_TX); | |
944 | if (ret) | |
945 | ieee80211_free_txskb(&local->hw, skb); | |
946 | out_unlock: | |
947 | mutex_unlock(&local->mtx); | |
948 | return ret; | |
949 | } | |
950 | ||
951 | int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy, | |
952 | struct wireless_dev *wdev, u64 cookie) | |
953 | { | |
954 | struct ieee80211_local *local = wiphy_priv(wiphy); | |
955 | ||
956 | return ieee80211_cancel_roc(local, cookie, true); | |
957 | } | |
958 | ||
2eb278e0 | 959 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
960 | { |
961 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
962 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
aaa016cc | 963 | INIT_DELAYED_WORK(&local->roc_work, ieee80211_roc_work); |
2eb278e0 JB |
964 | INIT_LIST_HEAD(&local->roc_list); |
965 | } | |
966 | ||
c8f994ee JB |
967 | void ieee80211_roc_purge(struct ieee80211_local *local, |
968 | struct ieee80211_sub_if_data *sdata) | |
2eb278e0 | 969 | { |
2eb278e0 | 970 | struct ieee80211_roc_work *roc, *tmp; |
aaa016cc | 971 | bool work_to_do = false; |
2eb278e0 JB |
972 | |
973 | mutex_lock(&local->mtx); | |
974 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
c8f994ee | 975 | if (sdata && roc->sdata != sdata) |
2eb278e0 JB |
976 | continue; |
977 | ||
aaa016cc JB |
978 | if (roc->started) { |
979 | if (local->ops->remain_on_channel) { | |
980 | /* can race, so ignore return value */ | |
981 | drv_cancel_remain_on_channel(local); | |
982 | ieee80211_roc_notify_destroy(roc); | |
983 | } else { | |
984 | roc->abort = true; | |
985 | work_to_do = true; | |
986 | } | |
2eb278e0 | 987 | } else { |
aaa016cc | 988 | ieee80211_roc_notify_destroy(roc); |
2eb278e0 JB |
989 | } |
990 | } | |
aaa016cc JB |
991 | if (work_to_do) |
992 | __ieee80211_roc_work(local); | |
993 | mutex_unlock(&local->mtx); | |
21f83589 | 994 | } |