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 | ||
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 | ||
1b894521 IP |
227 | /* In case of HW ROC, it is possible that the HW finished the |
228 | * ROC session before the actual requested time. In such a case | |
229 | * end the ROC session (disregarding the remaining time). | |
230 | */ | |
231 | if (roc->abort || roc->hw_begun || remaining <= 0) | |
aaa016cc JB |
232 | ieee80211_roc_notify_destroy(roc); |
233 | else | |
234 | remaining_dur_min = min(remaining_dur_min, remaining); | |
235 | } | |
236 | ||
237 | return remaining_dur_min; | |
238 | } | |
239 | ||
240 | static bool ieee80211_recalc_sw_work(struct ieee80211_local *local, | |
241 | unsigned long now) | |
242 | { | |
243 | long dur = ieee80211_end_finished_rocs(local, now); | |
244 | ||
245 | if (dur == LONG_MAX) | |
246 | return false; | |
247 | ||
248 | mod_delayed_work(local->workqueue, &local->roc_work, dur); | |
249 | return true; | |
250 | } | |
251 | ||
252 | static void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc, | |
253 | unsigned long start_time) | |
254 | { | |
aaa016cc | 255 | if (WARN_ON(roc->notified)) |
2eb278e0 JB |
256 | return; |
257 | ||
aaa016cc JB |
258 | roc->start_time = start_time; |
259 | roc->started = true; | |
aaa016cc | 260 | |
2eb278e0 JB |
261 | if (roc->mgmt_tx_cookie) { |
262 | if (!WARN_ON(!roc->frame)) { | |
55de908a JB |
263 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
264 | roc->chan->band); | |
2eb278e0 JB |
265 | roc->frame = NULL; |
266 | } | |
267 | } else { | |
50febf6a | 268 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
42d97a59 JB |
269 | roc->chan, roc->req_duration, |
270 | GFP_KERNEL); | |
2eb278e0 JB |
271 | } |
272 | ||
273 | roc->notified = true; | |
274 | } | |
275 | ||
21f83589 JB |
276 | static void ieee80211_hw_roc_start(struct work_struct *work) |
277 | { | |
278 | struct ieee80211_local *local = | |
279 | container_of(work, struct ieee80211_local, hw_roc_start); | |
aaa016cc | 280 | struct ieee80211_roc_work *roc; |
21f83589 JB |
281 | |
282 | mutex_lock(&local->mtx); | |
283 | ||
aaa016cc JB |
284 | list_for_each_entry(roc, &local->roc_list, list) { |
285 | if (!roc->started) | |
286 | break; | |
2eb278e0 | 287 | |
e6a8a3aa | 288 | roc->hw_begun = true; |
aaa016cc | 289 | ieee80211_handle_roc_started(roc, local->hw_roc_start_time); |
2eb278e0 | 290 | } |
aaa016cc | 291 | |
21f83589 JB |
292 | mutex_unlock(&local->mtx); |
293 | } | |
294 | ||
295 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
296 | { | |
297 | struct ieee80211_local *local = hw_to_local(hw); | |
298 | ||
2eb278e0 JB |
299 | local->hw_roc_start_time = jiffies; |
300 | ||
21f83589 JB |
301 | trace_api_ready_on_channel(local); |
302 | ||
303 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
306 | ||
aaa016cc | 307 | static void _ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 308 | { |
aaa016cc JB |
309 | struct ieee80211_roc_work *roc, *tmp; |
310 | enum ieee80211_roc_type type; | |
311 | u32 min_dur, max_dur; | |
21f83589 | 312 | |
2eb278e0 | 313 | lockdep_assert_held(&local->mtx); |
21f83589 | 314 | |
aaa016cc | 315 | if (WARN_ON(list_empty(&local->roc_list))) |
21f83589 | 316 | return; |
21f83589 | 317 | |
2eb278e0 JB |
318 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
319 | list); | |
71ecfa18 | 320 | |
aaa016cc | 321 | if (WARN_ON(roc->started)) |
0f6b3f59 JB |
322 | return; |
323 | ||
aaa016cc JB |
324 | min_dur = roc->duration; |
325 | max_dur = roc->duration; | |
326 | type = roc->type; | |
71ecfa18 | 327 | |
aaa016cc JB |
328 | list_for_each_entry(tmp, &local->roc_list, list) { |
329 | if (tmp == roc) | |
330 | continue; | |
331 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
332 | break; | |
333 | max_dur = max(tmp->duration, max_dur); | |
334 | min_dur = min(tmp->duration, min_dur); | |
335 | type = max(tmp->type, type); | |
336 | } | |
2eb278e0 | 337 | |
aaa016cc JB |
338 | if (local->ops->remain_on_channel) { |
339 | int ret = drv_remain_on_channel(local, roc->sdata, roc->chan, | |
340 | max_dur, type); | |
2eb278e0 JB |
341 | |
342 | if (ret) { | |
343 | wiphy_warn(local->hw.wiphy, | |
344 | "failed to start next HW ROC (%d)\n", ret); | |
345 | /* | |
346 | * queue the work struct again to avoid recursion | |
347 | * when multiple failures occur | |
348 | */ | |
aaa016cc JB |
349 | list_for_each_entry(tmp, &local->roc_list, list) { |
350 | if (tmp->sdata != roc->sdata || | |
351 | tmp->chan != roc->chan) | |
352 | break; | |
353 | tmp->started = true; | |
354 | tmp->abort = true; | |
355 | } | |
356 | ieee80211_queue_work(&local->hw, &local->hw_roc_done); | |
357 | return; | |
2eb278e0 | 358 | } |
b4b177a5 | 359 | |
aaa016cc JB |
360 | /* we'll notify about the start once the HW calls back */ |
361 | list_for_each_entry(tmp, &local->roc_list, list) { | |
362 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
363 | break; | |
364 | tmp->started = true; | |
365 | } | |
366 | } else { | |
b4b177a5 JB |
367 | /* If actually operating on the desired channel (with at least |
368 | * 20 MHz channel width) don't stop all the operations but still | |
369 | * treat it as though the ROC operation started properly, so | |
370 | * other ROC operations won't interfere with this one. | |
371 | */ | |
372 | roc->on_channel = roc->chan == local->_oper_chandef.chan && | |
373 | local->_oper_chandef.width != NL80211_CHAN_WIDTH_5 && | |
374 | local->_oper_chandef.width != NL80211_CHAN_WIDTH_10; | |
21f83589 | 375 | |
b4b177a5 | 376 | /* start this ROC */ |
2eb278e0 JB |
377 | ieee80211_recalc_idle(local); |
378 | ||
b4b177a5 JB |
379 | if (!roc->on_channel) { |
380 | ieee80211_offchannel_stop_vifs(local); | |
381 | ||
382 | local->tmp_channel = roc->chan; | |
383 | ieee80211_hw_config(local, 0); | |
384 | } | |
2eb278e0 | 385 | |
aaa016cc JB |
386 | ieee80211_queue_delayed_work(&local->hw, &local->roc_work, |
387 | msecs_to_jiffies(min_dur)); | |
388 | ||
389 | /* tell userspace or send frame(s) */ | |
390 | list_for_each_entry(tmp, &local->roc_list, list) { | |
391 | if (tmp->sdata != roc->sdata || tmp->chan != roc->chan) | |
392 | break; | |
393 | ||
394 | tmp->on_channel = roc->on_channel; | |
395 | ieee80211_handle_roc_started(tmp, jiffies); | |
396 | } | |
397 | } | |
398 | } | |
399 | ||
400 | void ieee80211_start_next_roc(struct ieee80211_local *local) | |
401 | { | |
402 | struct ieee80211_roc_work *roc; | |
403 | ||
404 | lockdep_assert_held(&local->mtx); | |
405 | ||
406 | if (list_empty(&local->roc_list)) { | |
407 | ieee80211_run_deferred_scan(local); | |
408 | return; | |
409 | } | |
410 | ||
470f4d61 EP |
411 | /* defer roc if driver is not started (i.e. during reconfig) */ |
412 | if (local->in_reconfig) | |
413 | return; | |
414 | ||
aaa016cc JB |
415 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
416 | list); | |
417 | ||
418 | if (WARN_ON_ONCE(roc->started)) | |
419 | return; | |
420 | ||
421 | if (local->ops->remain_on_channel) { | |
422 | _ieee80211_start_next_roc(local); | |
423 | } else { | |
424 | /* delay it a bit */ | |
425 | ieee80211_queue_delayed_work(&local->hw, &local->roc_work, | |
426 | round_jiffies_relative(HZ/2)); | |
427 | } | |
428 | } | |
429 | ||
430 | static void __ieee80211_roc_work(struct ieee80211_local *local) | |
431 | { | |
432 | struct ieee80211_roc_work *roc; | |
433 | bool on_channel; | |
434 | ||
435 | lockdep_assert_held(&local->mtx); | |
436 | ||
437 | if (WARN_ON(local->ops->remain_on_channel)) | |
438 | return; | |
2eb278e0 | 439 | |
aaa016cc JB |
440 | roc = list_first_entry_or_null(&local->roc_list, |
441 | struct ieee80211_roc_work, list); | |
442 | if (!roc) | |
443 | return; | |
2eb278e0 | 444 | |
aaa016cc JB |
445 | if (!roc->started) { |
446 | WARN_ON(local->use_chanctx); | |
447 | _ieee80211_start_next_roc(local); | |
2eb278e0 | 448 | } else { |
b4b177a5 | 449 | on_channel = roc->on_channel; |
aaa016cc JB |
450 | if (ieee80211_recalc_sw_work(local, jiffies)) |
451 | return; | |
2eb278e0 | 452 | |
aaa016cc JB |
453 | /* careful - roc pointer became invalid during recalc */ |
454 | ||
455 | if (!on_channel) { | |
3b24f4c6 | 456 | ieee80211_flush_queues(local, NULL, false); |
2eb278e0 JB |
457 | |
458 | local->tmp_channel = NULL; | |
459 | ieee80211_hw_config(local, 0); | |
460 | ||
aacde9ee | 461 | ieee80211_offchannel_return(local); |
2eb278e0 JB |
462 | } |
463 | ||
464 | ieee80211_recalc_idle(local); | |
aaa016cc | 465 | ieee80211_start_next_roc(local); |
2eb278e0 | 466 | } |
aaa016cc | 467 | } |
2eb278e0 | 468 | |
aaa016cc JB |
469 | static void ieee80211_roc_work(struct work_struct *work) |
470 | { | |
471 | struct ieee80211_local *local = | |
472 | container_of(work, struct ieee80211_local, roc_work.work); | |
473 | ||
474 | mutex_lock(&local->mtx); | |
475 | __ieee80211_roc_work(local); | |
2eb278e0 JB |
476 | mutex_unlock(&local->mtx); |
477 | } | |
478 | ||
479 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
480 | { | |
481 | struct ieee80211_local *local = | |
482 | container_of(work, struct ieee80211_local, hw_roc_done); | |
2eb278e0 JB |
483 | |
484 | mutex_lock(&local->mtx); | |
485 | ||
aaa016cc | 486 | ieee80211_end_finished_rocs(local, jiffies); |
2eb278e0 JB |
487 | |
488 | /* if there's another roc, start it now */ | |
489 | ieee80211_start_next_roc(local); | |
490 | ||
21f83589 JB |
491 | mutex_unlock(&local->mtx); |
492 | } | |
493 | ||
494 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
495 | { | |
496 | struct ieee80211_local *local = hw_to_local(hw); | |
497 | ||
498 | trace_api_remain_on_channel_expired(local); | |
499 | ||
500 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
503 | ||
aaa016cc JB |
504 | static bool |
505 | ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local, | |
506 | struct ieee80211_roc_work *new_roc, | |
507 | struct ieee80211_roc_work *cur_roc) | |
a2fcfccb JB |
508 | { |
509 | unsigned long now = jiffies; | |
aaa016cc JB |
510 | unsigned long remaining; |
511 | ||
512 | if (WARN_ON(!cur_roc->started)) | |
513 | return false; | |
a2fcfccb | 514 | |
aaa016cc JB |
515 | /* if it was scheduled in the hardware, but not started yet, |
516 | * we can only combine if the older one had a longer duration | |
517 | */ | |
518 | if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration) | |
a2fcfccb JB |
519 | return false; |
520 | ||
aaa016cc JB |
521 | remaining = cur_roc->start_time + |
522 | msecs_to_jiffies(cur_roc->duration) - | |
523 | now; | |
524 | ||
a2fcfccb JB |
525 | /* if it doesn't fit entirely, schedule a new one */ |
526 | if (new_roc->duration > jiffies_to_msecs(remaining)) | |
527 | return false; | |
528 | ||
aaa016cc JB |
529 | /* add just after the current one so we combine their finish later */ |
530 | list_add(&new_roc->list, &cur_roc->list); | |
531 | ||
532 | /* if the existing one has already begun then let this one also | |
533 | * begin, otherwise they'll both be marked properly by the work | |
534 | * struct that runs once the driver notifies us of the beginning | |
535 | */ | |
e6a8a3aa JB |
536 | if (cur_roc->hw_begun) { |
537 | new_roc->hw_begun = true; | |
aaa016cc | 538 | ieee80211_handle_roc_started(new_roc, now); |
e6a8a3aa | 539 | } |
a2fcfccb | 540 | |
a2fcfccb JB |
541 | return true; |
542 | } | |
543 | ||
544 | static int ieee80211_start_roc_work(struct ieee80211_local *local, | |
545 | struct ieee80211_sub_if_data *sdata, | |
546 | struct ieee80211_channel *channel, | |
547 | unsigned int duration, u64 *cookie, | |
548 | struct sk_buff *txskb, | |
549 | enum ieee80211_roc_type type) | |
550 | { | |
551 | struct ieee80211_roc_work *roc, *tmp; | |
aaa016cc | 552 | bool queued = false, combine_started = true; |
a2fcfccb JB |
553 | int ret; |
554 | ||
555 | lockdep_assert_held(&local->mtx); | |
556 | ||
557 | if (local->use_chanctx && !local->ops->remain_on_channel) | |
558 | return -EOPNOTSUPP; | |
559 | ||
560 | roc = kzalloc(sizeof(*roc), GFP_KERNEL); | |
561 | if (!roc) | |
562 | return -ENOMEM; | |
563 | ||
564 | /* | |
565 | * If the duration is zero, then the driver | |
566 | * wouldn't actually do anything. Set it to | |
567 | * 10 for now. | |
568 | * | |
569 | * TODO: cancel the off-channel operation | |
570 | * when we get the SKB's TX status and | |
571 | * the wait time was zero before. | |
572 | */ | |
573 | if (!duration) | |
574 | duration = 10; | |
575 | ||
576 | roc->chan = channel; | |
577 | roc->duration = duration; | |
578 | roc->req_duration = duration; | |
579 | roc->frame = txskb; | |
580 | roc->type = type; | |
581 | roc->sdata = sdata; | |
a2fcfccb JB |
582 | |
583 | /* | |
584 | * cookie is either the roc cookie (for normal roc) | |
585 | * or the SKB (for mgmt TX) | |
586 | */ | |
587 | if (!txskb) { | |
588 | roc->cookie = ieee80211_mgmt_tx_cookie(local); | |
589 | *cookie = roc->cookie; | |
590 | } else { | |
591 | roc->mgmt_tx_cookie = *cookie; | |
592 | } | |
593 | ||
aaa016cc JB |
594 | /* if there's no need to queue, handle it immediately */ |
595 | if (list_empty(&local->roc_list) && | |
596 | !local->scanning && !ieee80211_is_radar_required(local)) { | |
597 | /* if not HW assist, just queue & schedule work */ | |
598 | if (!local->ops->remain_on_channel) { | |
599 | list_add_tail(&roc->list, &local->roc_list); | |
600 | ieee80211_queue_delayed_work(&local->hw, | |
601 | &local->roc_work, 0); | |
602 | } else { | |
603 | /* otherwise actually kick it off here | |
604 | * (for error handling) | |
605 | */ | |
606 | ret = drv_remain_on_channel(local, sdata, channel, | |
607 | duration, type); | |
608 | if (ret) { | |
609 | kfree(roc); | |
610 | return ret; | |
611 | } | |
612 | roc->started = true; | |
613 | list_add_tail(&roc->list, &local->roc_list); | |
614 | } | |
a2fcfccb | 615 | |
aaa016cc | 616 | return 0; |
a2fcfccb JB |
617 | } |
618 | ||
aaa016cc | 619 | /* otherwise handle queueing */ |
a2fcfccb | 620 | |
a2fcfccb JB |
621 | list_for_each_entry(tmp, &local->roc_list, list) { |
622 | if (tmp->chan != channel || tmp->sdata != sdata) | |
623 | continue; | |
624 | ||
625 | /* | |
aaa016cc JB |
626 | * Extend this ROC if possible: If it hasn't started, add |
627 | * just after the new one to combine. | |
a2fcfccb JB |
628 | */ |
629 | if (!tmp->started) { | |
aaa016cc | 630 | list_add(&roc->list, &tmp->list); |
a2fcfccb JB |
631 | queued = true; |
632 | break; | |
633 | } | |
634 | ||
aaa016cc JB |
635 | if (!combine_started) |
636 | continue; | |
a2fcfccb | 637 | |
aaa016cc JB |
638 | if (!local->ops->remain_on_channel) { |
639 | /* If there's no hardware remain-on-channel, and | |
640 | * doing so won't push us over the maximum r-o-c | |
641 | * we allow, then we can just add the new one to | |
642 | * the list and mark it as having started now. | |
643 | * If it would push over the limit, don't try to | |
644 | * combine with other started ones (that haven't | |
645 | * been running as long) but potentially sort it | |
646 | * with others that had the same fate. | |
a2fcfccb | 647 | */ |
aaa016cc JB |
648 | unsigned long now = jiffies; |
649 | u32 elapsed = jiffies_to_msecs(now - tmp->start_time); | |
650 | struct wiphy *wiphy = local->hw.wiphy; | |
651 | u32 max_roc = wiphy->max_remain_on_channel_duration; | |
a2fcfccb | 652 | |
aaa016cc JB |
653 | if (elapsed + roc->duration > max_roc) { |
654 | combine_started = false; | |
655 | continue; | |
656 | } | |
a2fcfccb | 657 | |
aaa016cc JB |
658 | list_add(&roc->list, &tmp->list); |
659 | queued = true; | |
660 | roc->on_channel = tmp->on_channel; | |
661 | ieee80211_handle_roc_started(roc, now); | |
e9db4557 | 662 | ieee80211_recalc_sw_work(local, now); |
aaa016cc | 663 | break; |
a2fcfccb | 664 | } |
aaa016cc JB |
665 | |
666 | queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp); | |
667 | if (queued) | |
668 | break; | |
669 | /* if it wasn't queued, perhaps it can be combined with | |
670 | * another that also couldn't get combined previously, | |
671 | * but no need to check for already started ones, since | |
672 | * that can't work. | |
673 | */ | |
674 | combine_started = false; | |
a2fcfccb JB |
675 | } |
676 | ||
a2fcfccb JB |
677 | if (!queued) |
678 | list_add_tail(&roc->list, &local->roc_list); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev, | |
684 | struct ieee80211_channel *chan, | |
685 | unsigned int duration, u64 *cookie) | |
686 | { | |
687 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
688 | struct ieee80211_local *local = sdata->local; | |
689 | int ret; | |
690 | ||
691 | mutex_lock(&local->mtx); | |
692 | ret = ieee80211_start_roc_work(local, sdata, chan, | |
693 | duration, cookie, NULL, | |
694 | IEEE80211_ROC_TYPE_NORMAL); | |
695 | mutex_unlock(&local->mtx); | |
696 | ||
697 | return ret; | |
698 | } | |
699 | ||
700 | static int ieee80211_cancel_roc(struct ieee80211_local *local, | |
701 | u64 cookie, bool mgmt_tx) | |
702 | { | |
703 | struct ieee80211_roc_work *roc, *tmp, *found = NULL; | |
704 | int ret; | |
705 | ||
7d37fcd4 JB |
706 | if (!cookie) |
707 | return -ENOENT; | |
708 | ||
a2fcfccb JB |
709 | mutex_lock(&local->mtx); |
710 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
a2fcfccb JB |
711 | if (!mgmt_tx && roc->cookie != cookie) |
712 | continue; | |
713 | else if (mgmt_tx && roc->mgmt_tx_cookie != cookie) | |
714 | continue; | |
715 | ||
716 | found = roc; | |
717 | break; | |
718 | } | |
719 | ||
720 | if (!found) { | |
721 | mutex_unlock(&local->mtx); | |
722 | return -ENOENT; | |
723 | } | |
724 | ||
aaa016cc JB |
725 | if (!found->started) { |
726 | ieee80211_roc_notify_destroy(found); | |
727 | goto out_unlock; | |
728 | } | |
a2fcfccb JB |
729 | |
730 | if (local->ops->remain_on_channel) { | |
aaa016cc JB |
731 | ret = drv_cancel_remain_on_channel(local); |
732 | if (WARN_ON_ONCE(ret)) { | |
733 | mutex_unlock(&local->mtx); | |
734 | return ret; | |
a2fcfccb JB |
735 | } |
736 | ||
aaa016cc JB |
737 | /* TODO: |
738 | * if multiple items were combined here then we really shouldn't | |
739 | * cancel them all - we should wait for as much time as needed | |
740 | * for the longest remaining one, and only then cancel ... | |
741 | */ | |
742 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
743 | if (!roc->started) | |
744 | break; | |
745 | if (roc == found) | |
746 | found = NULL; | |
747 | ieee80211_roc_notify_destroy(roc); | |
748 | } | |
a2fcfccb | 749 | |
aaa016cc JB |
750 | /* that really must not happen - it was started */ |
751 | WARN_ON(found); | |
a2fcfccb | 752 | |
aaa016cc | 753 | ieee80211_start_next_roc(local); |
a2fcfccb | 754 | } else { |
aaa016cc | 755 | /* go through work struct to return to the operating channel */ |
a2fcfccb | 756 | found->abort = true; |
aaa016cc | 757 | mod_delayed_work(local->workqueue, &local->roc_work, 0); |
a2fcfccb JB |
758 | } |
759 | ||
aaa016cc JB |
760 | out_unlock: |
761 | mutex_unlock(&local->mtx); | |
762 | ||
a2fcfccb JB |
763 | return 0; |
764 | } | |
765 | ||
766 | int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy, | |
767 | struct wireless_dev *wdev, u64 cookie) | |
768 | { | |
769 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
770 | struct ieee80211_local *local = sdata->local; | |
771 | ||
772 | return ieee80211_cancel_roc(local, cookie, false); | |
773 | } | |
774 | ||
775 | int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev, | |
776 | struct cfg80211_mgmt_tx_params *params, u64 *cookie) | |
777 | { | |
778 | struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); | |
779 | struct ieee80211_local *local = sdata->local; | |
5ee00dbd | 780 | struct sk_buff *skb; |
a2fcfccb JB |
781 | struct sta_info *sta; |
782 | const struct ieee80211_mgmt *mgmt = (void *)params->buf; | |
783 | bool need_offchan = false; | |
784 | u32 flags; | |
785 | int ret; | |
786 | u8 *data; | |
787 | ||
788 | if (params->dont_wait_for_ack) | |
789 | flags = IEEE80211_TX_CTL_NO_ACK; | |
790 | else | |
791 | flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX | | |
792 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
793 | ||
794 | if (params->no_cck) | |
795 | flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
796 | ||
797 | switch (sdata->vif.type) { | |
798 | case NL80211_IFTYPE_ADHOC: | |
799 | if (!sdata->vif.bss_conf.ibss_joined) | |
800 | need_offchan = true; | |
801 | /* fall through */ | |
802 | #ifdef CONFIG_MAC80211_MESH | |
803 | case NL80211_IFTYPE_MESH_POINT: | |
804 | if (ieee80211_vif_is_mesh(&sdata->vif) && | |
805 | !sdata->u.mesh.mesh_id_len) | |
806 | need_offchan = true; | |
807 | /* fall through */ | |
808 | #endif | |
809 | case NL80211_IFTYPE_AP: | |
810 | case NL80211_IFTYPE_AP_VLAN: | |
811 | case NL80211_IFTYPE_P2P_GO: | |
812 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
813 | !ieee80211_vif_is_mesh(&sdata->vif) && | |
814 | !rcu_access_pointer(sdata->bss->beacon)) | |
815 | need_offchan = true; | |
816 | if (!ieee80211_is_action(mgmt->frame_control) || | |
817 | mgmt->u.action.category == WLAN_CATEGORY_PUBLIC || | |
818 | mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED || | |
819 | mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) | |
820 | break; | |
821 | rcu_read_lock(); | |
822 | sta = sta_info_get(sdata, mgmt->da); | |
823 | rcu_read_unlock(); | |
824 | if (!sta) | |
825 | return -ENOLINK; | |
826 | break; | |
827 | case NL80211_IFTYPE_STATION: | |
828 | case NL80211_IFTYPE_P2P_CLIENT: | |
829 | sdata_lock(sdata); | |
830 | if (!sdata->u.mgd.associated || | |
831 | (params->offchan && params->wait && | |
832 | local->ops->remain_on_channel && | |
833 | memcmp(sdata->u.mgd.associated->bssid, | |
834 | mgmt->bssid, ETH_ALEN))) | |
835 | need_offchan = true; | |
836 | sdata_unlock(sdata); | |
837 | break; | |
838 | case NL80211_IFTYPE_P2P_DEVICE: | |
839 | need_offchan = true; | |
840 | break; | |
841 | default: | |
842 | return -EOPNOTSUPP; | |
843 | } | |
844 | ||
845 | /* configurations requiring offchan cannot work if no channel has been | |
846 | * specified | |
847 | */ | |
848 | if (need_offchan && !params->chan) | |
849 | return -EINVAL; | |
850 | ||
851 | mutex_lock(&local->mtx); | |
852 | ||
853 | /* Check if the operating channel is the requested channel */ | |
854 | if (!need_offchan) { | |
855 | struct ieee80211_chanctx_conf *chanctx_conf; | |
856 | ||
857 | rcu_read_lock(); | |
858 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
859 | ||
860 | if (chanctx_conf) { | |
861 | need_offchan = params->chan && | |
862 | (params->chan != | |
863 | chanctx_conf->def.chan); | |
864 | } else if (!params->chan) { | |
865 | ret = -EINVAL; | |
866 | rcu_read_unlock(); | |
867 | goto out_unlock; | |
868 | } else { | |
869 | need_offchan = true; | |
870 | } | |
871 | rcu_read_unlock(); | |
872 | } | |
873 | ||
874 | if (need_offchan && !params->offchan) { | |
875 | ret = -EBUSY; | |
876 | goto out_unlock; | |
877 | } | |
878 | ||
879 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len); | |
880 | if (!skb) { | |
881 | ret = -ENOMEM; | |
882 | goto out_unlock; | |
883 | } | |
884 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
885 | ||
886 | data = skb_put(skb, params->len); | |
887 | memcpy(data, params->buf, params->len); | |
888 | ||
889 | /* Update CSA counters */ | |
890 | if (sdata->vif.csa_active && | |
891 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
892 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT || | |
893 | sdata->vif.type == NL80211_IFTYPE_ADHOC) && | |
894 | params->n_csa_offsets) { | |
895 | int i; | |
896 | struct beacon_data *beacon = NULL; | |
897 | ||
898 | rcu_read_lock(); | |
899 | ||
900 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
901 | beacon = rcu_dereference(sdata->u.ap.beacon); | |
902 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) | |
903 | beacon = rcu_dereference(sdata->u.ibss.presp); | |
904 | else if (ieee80211_vif_is_mesh(&sdata->vif)) | |
905 | beacon = rcu_dereference(sdata->u.mesh.beacon); | |
906 | ||
907 | if (beacon) | |
908 | for (i = 0; i < params->n_csa_offsets; i++) | |
909 | data[params->csa_offsets[i]] = | |
910 | beacon->csa_current_counter; | |
911 | ||
912 | rcu_read_unlock(); | |
913 | } | |
914 | ||
915 | IEEE80211_SKB_CB(skb)->flags = flags; | |
916 | ||
917 | skb->dev = sdata->dev; | |
918 | ||
919 | if (!params->dont_wait_for_ack) { | |
920 | /* make a copy to preserve the frame contents | |
921 | * in case of encryption. | |
922 | */ | |
5ee00dbd JB |
923 | ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL); |
924 | if (ret) { | |
a2fcfccb JB |
925 | kfree_skb(skb); |
926 | goto out_unlock; | |
927 | } | |
928 | } else { | |
929 | /* Assign a dummy non-zero cookie, it's not sent to | |
930 | * userspace in this case but we rely on its value | |
931 | * internally in the need_offchan case to distinguish | |
932 | * mgmt-tx from remain-on-channel. | |
933 | */ | |
934 | *cookie = 0xffffffff; | |
935 | } | |
936 | ||
937 | if (!need_offchan) { | |
938 | ieee80211_tx_skb(sdata, skb); | |
939 | ret = 0; | |
940 | goto out_unlock; | |
941 | } | |
942 | ||
943 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN | | |
944 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
945 | if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) | |
946 | IEEE80211_SKB_CB(skb)->hw_queue = | |
947 | local->hw.offchannel_tx_hw_queue; | |
948 | ||
949 | /* This will handle all kinds of coalescing and immediate TX */ | |
950 | ret = ieee80211_start_roc_work(local, sdata, params->chan, | |
951 | params->wait, cookie, skb, | |
952 | IEEE80211_ROC_TYPE_MGMT_TX); | |
953 | if (ret) | |
954 | ieee80211_free_txskb(&local->hw, skb); | |
955 | out_unlock: | |
956 | mutex_unlock(&local->mtx); | |
957 | return ret; | |
958 | } | |
959 | ||
960 | int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy, | |
961 | struct wireless_dev *wdev, u64 cookie) | |
962 | { | |
963 | struct ieee80211_local *local = wiphy_priv(wiphy); | |
964 | ||
965 | return ieee80211_cancel_roc(local, cookie, true); | |
966 | } | |
967 | ||
2eb278e0 | 968 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
969 | { |
970 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
971 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
aaa016cc | 972 | INIT_DELAYED_WORK(&local->roc_work, ieee80211_roc_work); |
2eb278e0 JB |
973 | INIT_LIST_HEAD(&local->roc_list); |
974 | } | |
975 | ||
c8f994ee JB |
976 | void ieee80211_roc_purge(struct ieee80211_local *local, |
977 | struct ieee80211_sub_if_data *sdata) | |
2eb278e0 | 978 | { |
2eb278e0 | 979 | struct ieee80211_roc_work *roc, *tmp; |
aaa016cc | 980 | bool work_to_do = false; |
2eb278e0 JB |
981 | |
982 | mutex_lock(&local->mtx); | |
983 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
c8f994ee | 984 | if (sdata && roc->sdata != sdata) |
2eb278e0 JB |
985 | continue; |
986 | ||
aaa016cc JB |
987 | if (roc->started) { |
988 | if (local->ops->remain_on_channel) { | |
989 | /* can race, so ignore return value */ | |
990 | drv_cancel_remain_on_channel(local); | |
991 | ieee80211_roc_notify_destroy(roc); | |
992 | } else { | |
993 | roc->abort = true; | |
994 | work_to_do = true; | |
995 | } | |
2eb278e0 | 996 | } else { |
aaa016cc | 997 | ieee80211_roc_notify_destroy(roc); |
2eb278e0 JB |
998 | } |
999 | } | |
aaa016cc JB |
1000 | if (work_to_do) |
1001 | __ieee80211_roc_work(local); | |
1002 | mutex_unlock(&local->mtx); | |
21f83589 | 1003 | } |