Commit | Line | Data |
---|---|---|
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 | ||
708d50ed AB |
131 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE || |
132 | sdata->vif.type == NL80211_IFTYPE_NAN) | |
f142c6b9 JB |
133 | continue; |
134 | ||
b23b025f BG |
135 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
136 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
137 | ||
138 | /* Check to see if we should disable beaconing. */ | |
d6a83228 JB |
139 | if (sdata->vif.bss_conf.enable_beacon) { |
140 | set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, | |
141 | &sdata->state); | |
142 | sdata->vif.bss_conf.enable_beacon = false; | |
b203ffc3 JM |
143 | ieee80211_bss_info_change_notify( |
144 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 145 | } |
b203ffc3 | 146 | |
6c17b77b SF |
147 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
148 | sdata->u.mgd.associated) | |
149 | ieee80211_offchannel_ps_enable(sdata); | |
b203ffc3 JM |
150 | } |
151 | mutex_unlock(&local->iflist_mtx); | |
152 | } | |
153 | ||
aacde9ee | 154 | void ieee80211_offchannel_return(struct ieee80211_local *local) |
b203ffc3 JM |
155 | { |
156 | struct ieee80211_sub_if_data *sdata; | |
157 | ||
fe57d9f5 JB |
158 | if (WARN_ON(local->use_chanctx)) |
159 | return; | |
160 | ||
b203ffc3 JM |
161 | mutex_lock(&local->iflist_mtx); |
162 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f142c6b9 JB |
163 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
164 | continue; | |
165 | ||
f6e8cb72 EP |
166 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
167 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
168 | ||
b203ffc3 JM |
169 | if (!ieee80211_sdata_running(sdata)) |
170 | continue; | |
171 | ||
172 | /* Tell AP we're back */ | |
aacde9ee SG |
173 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
174 | sdata->u.mgd.associated) | |
175 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 | 176 | |
d6a83228 JB |
177 | if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, |
178 | &sdata->state)) { | |
179 | sdata->vif.bss_conf.enable_beacon = true; | |
b203ffc3 JM |
180 | ieee80211_bss_info_change_notify( |
181 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 182 | } |
b203ffc3 JM |
183 | } |
184 | mutex_unlock(&local->iflist_mtx); | |
6c17b77b | 185 | |
445ea4e8 | 186 | ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, |
cca07b00 LC |
187 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL, |
188 | false); | |
b203ffc3 | 189 | } |
21f83589 | 190 | |
aaa016cc | 191 | static void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) |
2eb278e0 | 192 | { |
aaa016cc JB |
193 | /* was never transmitted */ |
194 | if (roc->frame) { | |
195 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, roc->mgmt_tx_cookie, | |
196 | roc->frame->data, roc->frame->len, | |
197 | false, GFP_KERNEL); | |
198 | ieee80211_free_txskb(&roc->sdata->local->hw, roc->frame); | |
199 | } | |
200 | ||
201 | if (!roc->mgmt_tx_cookie) | |
202 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, | |
203 | roc->cookie, roc->chan, | |
204 | GFP_KERNEL); | |
205 | ||
206 | list_del(&roc->list); | |
207 | kfree(roc); | |
208 | } | |
209 | ||
210 | static unsigned long ieee80211_end_finished_rocs(struct ieee80211_local *local, | |
211 | unsigned long now) | |
212 | { | |
213 | struct ieee80211_roc_work *roc, *tmp; | |
214 | long remaining_dur_min = LONG_MAX; | |
215 | ||
216 | lockdep_assert_held(&local->mtx); | |
217 | ||
218 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
219 | long remaining; | |
220 | ||
221 | if (!roc->started) | |
222 | break; | |
223 | ||
224 | remaining = roc->start_time + | |
225 | msecs_to_jiffies(roc->duration) - | |
226 | now; | |
227 | ||
1b894521 IP |
228 | /* In case of HW ROC, it is possible that the HW finished the |
229 | * ROC session before the actual requested time. In such a case | |
230 | * end the ROC session (disregarding the remaining time). | |
231 | */ | |
232 | if (roc->abort || roc->hw_begun || remaining <= 0) | |
aaa016cc JB |
233 | ieee80211_roc_notify_destroy(roc); |
234 | else | |
235 | remaining_dur_min = min(remaining_dur_min, remaining); | |
236 | } | |
237 | ||
238 | return remaining_dur_min; | |
239 | } | |
240 | ||
241 | static bool ieee80211_recalc_sw_work(struct ieee80211_local *local, | |
242 | unsigned long now) | |
243 | { | |
244 | long dur = ieee80211_end_finished_rocs(local, now); | |
245 | ||
246 | if (dur == LONG_MAX) | |
247 | return false; | |
248 | ||
249 | mod_delayed_work(local->workqueue, &local->roc_work, dur); | |
250 | return true; | |
251 | } | |
252 | ||
253 | static void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc, | |
254 | unsigned long start_time) | |
255 | { | |
aaa016cc | 256 | if (WARN_ON(roc->notified)) |
2eb278e0 JB |
257 | return; |
258 | ||
aaa016cc JB |
259 | roc->start_time = start_time; |
260 | roc->started = true; | |
aaa016cc | 261 | |
2eb278e0 JB |
262 | if (roc->mgmt_tx_cookie) { |
263 | if (!WARN_ON(!roc->frame)) { | |
55de908a JB |
264 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
265 | roc->chan->band); | |
2eb278e0 JB |
266 | roc->frame = NULL; |
267 | } | |
268 | } else { | |
50febf6a | 269 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
42d97a59 JB |
270 | roc->chan, roc->req_duration, |
271 | GFP_KERNEL); | |
2eb278e0 JB |
272 | } |
273 | ||
274 | roc->notified = true; | |
275 | } | |
276 | ||
21f83589 JB |
277 | static void ieee80211_hw_roc_start(struct work_struct *work) |
278 | { | |
279 | struct ieee80211_local *local = | |
280 | container_of(work, struct ieee80211_local, hw_roc_start); | |
aaa016cc | 281 | struct ieee80211_roc_work *roc; |
21f83589 JB |
282 | |
283 | mutex_lock(&local->mtx); | |
284 | ||
aaa016cc JB |
285 | list_for_each_entry(roc, &local->roc_list, list) { |
286 | if (!roc->started) | |
287 | break; | |
2eb278e0 | 288 | |
e6a8a3aa | 289 | roc->hw_begun = true; |
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 | ||
470f4d61 EP |
412 | /* defer roc if driver is not started (i.e. during reconfig) */ |
413 | if (local->in_reconfig) | |
414 | return; | |
415 | ||
aaa016cc JB |
416 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
417 | list); | |
418 | ||
419 | if (WARN_ON_ONCE(roc->started)) | |
420 | return; | |
421 | ||
422 | if (local->ops->remain_on_channel) { | |
423 | _ieee80211_start_next_roc(local); | |
424 | } else { | |
425 | /* delay it a bit */ | |
426 | ieee80211_queue_delayed_work(&local->hw, &local->roc_work, | |
427 | round_jiffies_relative(HZ/2)); | |
428 | } | |
429 | } | |
430 | ||
431 | static void __ieee80211_roc_work(struct ieee80211_local *local) | |
432 | { | |
433 | struct ieee80211_roc_work *roc; | |
434 | bool on_channel; | |
435 | ||
436 | lockdep_assert_held(&local->mtx); | |
437 | ||
438 | if (WARN_ON(local->ops->remain_on_channel)) | |
439 | return; | |
2eb278e0 | 440 | |
aaa016cc JB |
441 | roc = list_first_entry_or_null(&local->roc_list, |
442 | struct ieee80211_roc_work, list); | |
443 | if (!roc) | |
444 | return; | |
2eb278e0 | 445 | |
aaa016cc JB |
446 | if (!roc->started) { |
447 | WARN_ON(local->use_chanctx); | |
448 | _ieee80211_start_next_roc(local); | |
2eb278e0 | 449 | } else { |
b4b177a5 | 450 | on_channel = roc->on_channel; |
aaa016cc JB |
451 | if (ieee80211_recalc_sw_work(local, jiffies)) |
452 | return; | |
2eb278e0 | 453 | |
aaa016cc JB |
454 | /* careful - roc pointer became invalid during recalc */ |
455 | ||
456 | if (!on_channel) { | |
3b24f4c6 | 457 | ieee80211_flush_queues(local, NULL, false); |
2eb278e0 JB |
458 | |
459 | local->tmp_channel = NULL; | |
460 | ieee80211_hw_config(local, 0); | |
461 | ||
aacde9ee | 462 | ieee80211_offchannel_return(local); |
2eb278e0 JB |
463 | } |
464 | ||
465 | ieee80211_recalc_idle(local); | |
aaa016cc | 466 | ieee80211_start_next_roc(local); |
2eb278e0 | 467 | } |
aaa016cc | 468 | } |
2eb278e0 | 469 | |
aaa016cc JB |
470 | static void ieee80211_roc_work(struct work_struct *work) |
471 | { | |
472 | struct ieee80211_local *local = | |
473 | container_of(work, struct ieee80211_local, roc_work.work); | |
474 | ||
475 | mutex_lock(&local->mtx); | |
476 | __ieee80211_roc_work(local); | |
2eb278e0 JB |
477 | mutex_unlock(&local->mtx); |
478 | } | |
479 | ||
480 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
481 | { | |
482 | struct ieee80211_local *local = | |
483 | container_of(work, struct ieee80211_local, hw_roc_done); | |
2eb278e0 JB |
484 | |
485 | mutex_lock(&local->mtx); | |
486 | ||
aaa016cc | 487 | ieee80211_end_finished_rocs(local, jiffies); |
2eb278e0 JB |
488 | |
489 | /* if there's another roc, start it now */ | |
490 | ieee80211_start_next_roc(local); | |
491 | ||
21f83589 JB |
492 | mutex_unlock(&local->mtx); |
493 | } | |
494 | ||
495 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
496 | { | |
497 | struct ieee80211_local *local = hw_to_local(hw); | |
498 | ||
499 | trace_api_remain_on_channel_expired(local); | |
500 | ||
501 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
502 | } | |
503 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
504 | ||
aaa016cc JB |
505 | static bool |
506 | ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local, | |
507 | struct ieee80211_roc_work *new_roc, | |
508 | struct ieee80211_roc_work *cur_roc) | |
a2fcfccb JB |
509 | { |
510 | unsigned long now = jiffies; | |
aaa016cc JB |
511 | unsigned long remaining; |
512 | ||
513 | if (WARN_ON(!cur_roc->started)) | |
514 | return false; | |
a2fcfccb | 515 | |
aaa016cc JB |
516 | /* if it was scheduled in the hardware, but not started yet, |
517 | * we can only combine if the older one had a longer duration | |
518 | */ | |
519 | if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration) | |
a2fcfccb JB |
520 | return false; |
521 | ||
aaa016cc JB |
522 | remaining = cur_roc->start_time + |
523 | msecs_to_jiffies(cur_roc->duration) - | |
524 | now; | |
525 | ||
a2fcfccb JB |
526 | /* if it doesn't fit entirely, schedule a new one */ |
527 | if (new_roc->duration > jiffies_to_msecs(remaining)) | |
528 | return false; | |
529 | ||
aaa016cc JB |
530 | /* add just after the current one so we combine their finish later */ |
531 | list_add(&new_roc->list, &cur_roc->list); | |
532 | ||
533 | /* if the existing one has already begun then let this one also | |
534 | * begin, otherwise they'll both be marked properly by the work | |
535 | * struct that runs once the driver notifies us of the beginning | |
536 | */ | |
e6a8a3aa JB |
537 | if (cur_roc->hw_begun) { |
538 | new_roc->hw_begun = true; | |
aaa016cc | 539 | ieee80211_handle_roc_started(new_roc, now); |
e6a8a3aa | 540 | } |
a2fcfccb | 541 | |
a2fcfccb JB |
542 | return true; |
543 | } | |
544 | ||
545 | static int ieee80211_start_roc_work(struct ieee80211_local *local, | |
546 | struct ieee80211_sub_if_data *sdata, | |
547 | struct ieee80211_channel *channel, | |
548 | unsigned int duration, u64 *cookie, | |
549 | struct sk_buff *txskb, | |
550 | enum ieee80211_roc_type type) | |
551 | { | |
552 | struct ieee80211_roc_work *roc, *tmp; | |
aaa016cc | 553 | bool queued = false, combine_started = true; |
a2fcfccb JB |
554 | int ret; |
555 | ||
556 | lockdep_assert_held(&local->mtx); | |
557 | ||
558 | if (local->use_chanctx && !local->ops->remain_on_channel) | |
559 | return -EOPNOTSUPP; | |
560 | ||
561 | roc = kzalloc(sizeof(*roc), GFP_KERNEL); | |
562 | if (!roc) | |
563 | return -ENOMEM; | |
564 | ||
565 | /* | |
566 | * If the duration is zero, then the driver | |
567 | * wouldn't actually do anything. Set it to | |
568 | * 10 for now. | |
569 | * | |
570 | * TODO: cancel the off-channel operation | |
571 | * when we get the SKB's TX status and | |
572 | * the wait time was zero before. | |
573 | */ | |
574 | if (!duration) | |
575 | duration = 10; | |
576 | ||
577 | roc->chan = channel; | |
578 | roc->duration = duration; | |
579 | roc->req_duration = duration; | |
580 | roc->frame = txskb; | |
581 | roc->type = type; | |
582 | roc->sdata = sdata; | |
a2fcfccb JB |
583 | |
584 | /* | |
585 | * cookie is either the roc cookie (for normal roc) | |
586 | * or the SKB (for mgmt TX) | |
587 | */ | |
588 | if (!txskb) { | |
589 | roc->cookie = ieee80211_mgmt_tx_cookie(local); | |
590 | *cookie = roc->cookie; | |
591 | } else { | |
592 | roc->mgmt_tx_cookie = *cookie; | |
593 | } | |
594 | ||
aaa016cc JB |
595 | /* if there's no need to queue, handle it immediately */ |
596 | if (list_empty(&local->roc_list) && | |
597 | !local->scanning && !ieee80211_is_radar_required(local)) { | |
598 | /* if not HW assist, just queue & schedule work */ | |
599 | if (!local->ops->remain_on_channel) { | |
600 | list_add_tail(&roc->list, &local->roc_list); | |
601 | ieee80211_queue_delayed_work(&local->hw, | |
602 | &local->roc_work, 0); | |
603 | } else { | |
604 | /* otherwise actually kick it off here | |
605 | * (for error handling) | |
606 | */ | |
607 | ret = drv_remain_on_channel(local, sdata, channel, | |
608 | duration, type); | |
609 | if (ret) { | |
610 | kfree(roc); | |
611 | return ret; | |
612 | } | |
613 | roc->started = true; | |
614 | list_add_tail(&roc->list, &local->roc_list); | |
615 | } | |
a2fcfccb | 616 | |
aaa016cc | 617 | return 0; |
a2fcfccb JB |
618 | } |
619 | ||
aaa016cc | 620 | /* otherwise handle queueing */ |
a2fcfccb | 621 | |
a2fcfccb JB |
622 | list_for_each_entry(tmp, &local->roc_list, list) { |
623 | if (tmp->chan != channel || tmp->sdata != sdata) | |
624 | continue; | |
625 | ||
626 | /* | |
aaa016cc JB |
627 | * Extend this ROC if possible: If it hasn't started, add |
628 | * just after the new one to combine. | |
a2fcfccb JB |
629 | */ |
630 | if (!tmp->started) { | |
aaa016cc | 631 | list_add(&roc->list, &tmp->list); |
a2fcfccb JB |
632 | queued = true; |
633 | break; | |
634 | } | |
635 | ||
aaa016cc JB |
636 | if (!combine_started) |
637 | continue; | |
a2fcfccb | 638 | |
aaa016cc JB |
639 | if (!local->ops->remain_on_channel) { |
640 | /* If there's no hardware remain-on-channel, and | |
641 | * doing so won't push us over the maximum r-o-c | |
642 | * we allow, then we can just add the new one to | |
643 | * the list and mark it as having started now. | |
644 | * If it would push over the limit, don't try to | |
645 | * combine with other started ones (that haven't | |
646 | * been running as long) but potentially sort it | |
647 | * with others that had the same fate. | |
a2fcfccb | 648 | */ |
aaa016cc JB |
649 | unsigned long now = jiffies; |
650 | u32 elapsed = jiffies_to_msecs(now - tmp->start_time); | |
651 | struct wiphy *wiphy = local->hw.wiphy; | |
652 | u32 max_roc = wiphy->max_remain_on_channel_duration; | |
a2fcfccb | 653 | |
aaa016cc JB |
654 | if (elapsed + roc->duration > max_roc) { |
655 | combine_started = false; | |
656 | continue; | |
657 | } | |
a2fcfccb | 658 | |
aaa016cc JB |
659 | list_add(&roc->list, &tmp->list); |
660 | queued = true; | |
661 | roc->on_channel = tmp->on_channel; | |
662 | ieee80211_handle_roc_started(roc, now); | |
e9db4557 | 663 | ieee80211_recalc_sw_work(local, now); |
aaa016cc | 664 | break; |
a2fcfccb | 665 | } |
aaa016cc JB |
666 | |
667 | queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp); | |
668 | if (queued) | |
669 | break; | |
670 | /* if it wasn't queued, perhaps it can be combined with | |
671 | * another that also couldn't get combined previously, | |
672 | * but no need to check for already started ones, since | |
673 | * that can't work. | |
674 | */ | |
675 | combine_started = false; | |
a2fcfccb JB |
676 | } |
677 | ||
a2fcfccb JB |
678 | if (!queued) |
679 | list_add_tail(&roc->list, &local->roc_list); | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev, | |
685 | struct ieee80211_channel *chan, | |
686 | unsigned int duration, u64 *cookie) | |
687 | { | |
688 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
689 | struct ieee80211_local *local = sdata->local; | |
690 | int ret; | |
691 | ||
692 | mutex_lock(&local->mtx); | |
693 | ret = ieee80211_start_roc_work(local, sdata, chan, | |
694 | duration, cookie, NULL, | |
695 | IEEE80211_ROC_TYPE_NORMAL); | |
696 | mutex_unlock(&local->mtx); | |
697 | ||
698 | return ret; | |
699 | } | |
700 | ||
701 | static int ieee80211_cancel_roc(struct ieee80211_local *local, | |
702 | u64 cookie, bool mgmt_tx) | |
703 | { | |
704 | struct ieee80211_roc_work *roc, *tmp, *found = NULL; | |
705 | int ret; | |
706 | ||
7d37fcd4 JB |
707 | if (!cookie) |
708 | return -ENOENT; | |
709 | ||
a2fcfccb JB |
710 | mutex_lock(&local->mtx); |
711 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
a2fcfccb JB |
712 | if (!mgmt_tx && roc->cookie != cookie) |
713 | continue; | |
714 | else if (mgmt_tx && roc->mgmt_tx_cookie != cookie) | |
715 | continue; | |
716 | ||
717 | found = roc; | |
718 | break; | |
719 | } | |
720 | ||
721 | if (!found) { | |
722 | mutex_unlock(&local->mtx); | |
723 | return -ENOENT; | |
724 | } | |
725 | ||
aaa016cc JB |
726 | if (!found->started) { |
727 | ieee80211_roc_notify_destroy(found); | |
728 | goto out_unlock; | |
729 | } | |
a2fcfccb JB |
730 | |
731 | if (local->ops->remain_on_channel) { | |
aaa016cc JB |
732 | ret = drv_cancel_remain_on_channel(local); |
733 | if (WARN_ON_ONCE(ret)) { | |
734 | mutex_unlock(&local->mtx); | |
735 | return ret; | |
a2fcfccb JB |
736 | } |
737 | ||
aaa016cc JB |
738 | /* TODO: |
739 | * if multiple items were combined here then we really shouldn't | |
740 | * cancel them all - we should wait for as much time as needed | |
741 | * for the longest remaining one, and only then cancel ... | |
742 | */ | |
743 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
744 | if (!roc->started) | |
745 | break; | |
746 | if (roc == found) | |
747 | found = NULL; | |
748 | ieee80211_roc_notify_destroy(roc); | |
749 | } | |
a2fcfccb | 750 | |
aaa016cc JB |
751 | /* that really must not happen - it was started */ |
752 | WARN_ON(found); | |
a2fcfccb | 753 | |
aaa016cc | 754 | ieee80211_start_next_roc(local); |
a2fcfccb | 755 | } else { |
aaa016cc | 756 | /* go through work struct to return to the operating channel */ |
a2fcfccb | 757 | found->abort = true; |
aaa016cc | 758 | mod_delayed_work(local->workqueue, &local->roc_work, 0); |
a2fcfccb JB |
759 | } |
760 | ||
aaa016cc JB |
761 | out_unlock: |
762 | mutex_unlock(&local->mtx); | |
763 | ||
a2fcfccb JB |
764 | return 0; |
765 | } | |
766 | ||
767 | int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy, | |
768 | struct wireless_dev *wdev, u64 cookie) | |
769 | { | |
770 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
771 | struct ieee80211_local *local = sdata->local; | |
772 | ||
773 | return ieee80211_cancel_roc(local, cookie, false); | |
774 | } | |
775 | ||
776 | int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev, | |
777 | struct cfg80211_mgmt_tx_params *params, u64 *cookie) | |
778 | { | |
779 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
780 | struct ieee80211_local *local = sdata->local; | |
5ee00dbd | 781 | struct sk_buff *skb; |
a2fcfccb JB |
782 | struct sta_info *sta; |
783 | const struct ieee80211_mgmt *mgmt = (void *)params->buf; | |
784 | bool need_offchan = false; | |
785 | u32 flags; | |
786 | int ret; | |
787 | u8 *data; | |
788 | ||
789 | if (params->dont_wait_for_ack) | |
790 | flags = IEEE80211_TX_CTL_NO_ACK; | |
791 | else | |
792 | flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX | | |
793 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
794 | ||
795 | if (params->no_cck) | |
796 | flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
797 | ||
798 | switch (sdata->vif.type) { | |
799 | case NL80211_IFTYPE_ADHOC: | |
800 | if (!sdata->vif.bss_conf.ibss_joined) | |
801 | need_offchan = true; | |
802 | /* fall through */ | |
803 | #ifdef CONFIG_MAC80211_MESH | |
804 | case NL80211_IFTYPE_MESH_POINT: | |
805 | if (ieee80211_vif_is_mesh(&sdata->vif) && | |
806 | !sdata->u.mesh.mesh_id_len) | |
807 | need_offchan = true; | |
808 | /* fall through */ | |
809 | #endif | |
810 | case NL80211_IFTYPE_AP: | |
811 | case NL80211_IFTYPE_AP_VLAN: | |
812 | case NL80211_IFTYPE_P2P_GO: | |
813 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
814 | !ieee80211_vif_is_mesh(&sdata->vif) && | |
815 | !rcu_access_pointer(sdata->bss->beacon)) | |
816 | need_offchan = true; | |
817 | if (!ieee80211_is_action(mgmt->frame_control) || | |
818 | mgmt->u.action.category == WLAN_CATEGORY_PUBLIC || | |
819 | mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED || | |
820 | mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) | |
821 | break; | |
822 | rcu_read_lock(); | |
1d4de2e2 | 823 | sta = sta_info_get_bss(sdata, mgmt->da); |
a2fcfccb JB |
824 | rcu_read_unlock(); |
825 | if (!sta) | |
826 | return -ENOLINK; | |
827 | break; | |
828 | case NL80211_IFTYPE_STATION: | |
829 | case NL80211_IFTYPE_P2P_CLIENT: | |
830 | sdata_lock(sdata); | |
831 | if (!sdata->u.mgd.associated || | |
832 | (params->offchan && params->wait && | |
833 | local->ops->remain_on_channel && | |
834 | memcmp(sdata->u.mgd.associated->bssid, | |
835 | mgmt->bssid, ETH_ALEN))) | |
836 | need_offchan = true; | |
837 | sdata_unlock(sdata); | |
838 | break; | |
839 | case NL80211_IFTYPE_P2P_DEVICE: | |
840 | need_offchan = true; | |
841 | break; | |
cb3b7d87 | 842 | case NL80211_IFTYPE_NAN: |
a2fcfccb JB |
843 | default: |
844 | return -EOPNOTSUPP; | |
845 | } | |
846 | ||
847 | /* configurations requiring offchan cannot work if no channel has been | |
848 | * specified | |
849 | */ | |
850 | if (need_offchan && !params->chan) | |
851 | return -EINVAL; | |
852 | ||
853 | mutex_lock(&local->mtx); | |
854 | ||
855 | /* Check if the operating channel is the requested channel */ | |
856 | if (!need_offchan) { | |
857 | struct ieee80211_chanctx_conf *chanctx_conf; | |
858 | ||
859 | rcu_read_lock(); | |
860 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
861 | ||
862 | if (chanctx_conf) { | |
863 | need_offchan = params->chan && | |
864 | (params->chan != | |
865 | chanctx_conf->def.chan); | |
866 | } else if (!params->chan) { | |
867 | ret = -EINVAL; | |
868 | rcu_read_unlock(); | |
869 | goto out_unlock; | |
870 | } else { | |
871 | need_offchan = true; | |
872 | } | |
873 | rcu_read_unlock(); | |
874 | } | |
875 | ||
876 | if (need_offchan && !params->offchan) { | |
877 | ret = -EBUSY; | |
878 | goto out_unlock; | |
879 | } | |
880 | ||
881 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len); | |
882 | if (!skb) { | |
883 | ret = -ENOMEM; | |
884 | goto out_unlock; | |
885 | } | |
886 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
887 | ||
59ae1d12 | 888 | data = skb_put_data(skb, params->buf, params->len); |
a2fcfccb JB |
889 | |
890 | /* Update CSA counters */ | |
891 | if (sdata->vif.csa_active && | |
892 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
893 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT || | |
894 | sdata->vif.type == NL80211_IFTYPE_ADHOC) && | |
895 | params->n_csa_offsets) { | |
896 | int i; | |
897 | struct beacon_data *beacon = NULL; | |
898 | ||
899 | rcu_read_lock(); | |
900 | ||
901 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
902 | beacon = rcu_dereference(sdata->u.ap.beacon); | |
903 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) | |
904 | beacon = rcu_dereference(sdata->u.ibss.presp); | |
905 | else if (ieee80211_vif_is_mesh(&sdata->vif)) | |
906 | beacon = rcu_dereference(sdata->u.mesh.beacon); | |
907 | ||
908 | if (beacon) | |
909 | for (i = 0; i < params->n_csa_offsets; i++) | |
910 | data[params->csa_offsets[i]] = | |
911 | beacon->csa_current_counter; | |
912 | ||
913 | rcu_read_unlock(); | |
914 | } | |
915 | ||
916 | IEEE80211_SKB_CB(skb)->flags = flags; | |
917 | ||
918 | skb->dev = sdata->dev; | |
919 | ||
920 | if (!params->dont_wait_for_ack) { | |
921 | /* make a copy to preserve the frame contents | |
922 | * in case of encryption. | |
923 | */ | |
5ee00dbd JB |
924 | ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL); |
925 | if (ret) { | |
a2fcfccb JB |
926 | kfree_skb(skb); |
927 | goto out_unlock; | |
928 | } | |
929 | } else { | |
930 | /* Assign a dummy non-zero cookie, it's not sent to | |
931 | * userspace in this case but we rely on its value | |
932 | * internally in the need_offchan case to distinguish | |
933 | * mgmt-tx from remain-on-channel. | |
934 | */ | |
935 | *cookie = 0xffffffff; | |
936 | } | |
937 | ||
938 | if (!need_offchan) { | |
939 | ieee80211_tx_skb(sdata, skb); | |
940 | ret = 0; | |
941 | goto out_unlock; | |
942 | } | |
943 | ||
944 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN | | |
945 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
946 | if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) | |
947 | IEEE80211_SKB_CB(skb)->hw_queue = | |
948 | local->hw.offchannel_tx_hw_queue; | |
949 | ||
950 | /* This will handle all kinds of coalescing and immediate TX */ | |
951 | ret = ieee80211_start_roc_work(local, sdata, params->chan, | |
952 | params->wait, cookie, skb, | |
953 | IEEE80211_ROC_TYPE_MGMT_TX); | |
954 | if (ret) | |
955 | ieee80211_free_txskb(&local->hw, skb); | |
956 | out_unlock: | |
957 | mutex_unlock(&local->mtx); | |
958 | return ret; | |
959 | } | |
960 | ||
961 | int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy, | |
962 | struct wireless_dev *wdev, u64 cookie) | |
963 | { | |
964 | struct ieee80211_local *local = wiphy_priv(wiphy); | |
965 | ||
966 | return ieee80211_cancel_roc(local, cookie, true); | |
967 | } | |
968 | ||
2eb278e0 | 969 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
970 | { |
971 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
972 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
aaa016cc | 973 | INIT_DELAYED_WORK(&local->roc_work, ieee80211_roc_work); |
2eb278e0 JB |
974 | INIT_LIST_HEAD(&local->roc_list); |
975 | } | |
976 | ||
c8f994ee JB |
977 | void ieee80211_roc_purge(struct ieee80211_local *local, |
978 | struct ieee80211_sub_if_data *sdata) | |
2eb278e0 | 979 | { |
2eb278e0 | 980 | struct ieee80211_roc_work *roc, *tmp; |
aaa016cc | 981 | bool work_to_do = false; |
2eb278e0 JB |
982 | |
983 | mutex_lock(&local->mtx); | |
984 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
c8f994ee | 985 | if (sdata && roc->sdata != sdata) |
2eb278e0 JB |
986 | continue; |
987 | ||
aaa016cc JB |
988 | if (roc->started) { |
989 | if (local->ops->remain_on_channel) { | |
990 | /* can race, so ignore return value */ | |
991 | drv_cancel_remain_on_channel(local); | |
992 | ieee80211_roc_notify_destroy(roc); | |
993 | } else { | |
994 | roc->abort = true; | |
995 | work_to_do = true; | |
996 | } | |
2eb278e0 | 997 | } else { |
aaa016cc | 998 | ieee80211_roc_notify_destroy(roc); |
2eb278e0 JB |
999 | } |
1000 | } | |
aaa016cc JB |
1001 | if (work_to_do) |
1002 | __ieee80211_roc_work(local); | |
1003 | mutex_unlock(&local->mtx); | |
21f83589 | 1004 | } |