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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 RM |
48 | if (!local->offchannel_ps_enabled || |
49 | !(local->hw.flags & IEEE80211_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 | */ | |
60 | ieee80211_send_nullfunc(local, sdata, 1); | |
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) | |
69 | ieee80211_send_nullfunc(local, sdata, 0); | |
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 | */ | |
96 | ieee80211_send_nullfunc(local, sdata, 0); | |
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 | ||
b23b025f BG |
105 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local, |
106 | bool offchannel_ps_enable) | |
b203ffc3 JM |
107 | { |
108 | struct ieee80211_sub_if_data *sdata; | |
109 | ||
fe57d9f5 JB |
110 | if (WARN_ON(local->use_chanctx)) |
111 | return; | |
112 | ||
b23b025f BG |
113 | /* |
114 | * notify the AP about us leaving the channel and stop all | |
115 | * STA interfaces. | |
116 | */ | |
b203ffc3 JM |
117 | mutex_lock(&local->iflist_mtx); |
118 | list_for_each_entry(sdata, &local->interfaces, list) { | |
119 | if (!ieee80211_sdata_running(sdata)) | |
120 | continue; | |
121 | ||
f142c6b9 JB |
122 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
123 | continue; | |
124 | ||
b23b025f BG |
125 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
126 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
127 | ||
128 | /* Check to see if we should disable beaconing. */ | |
b203ffc3 JM |
129 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
130 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
131 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
132 | ieee80211_bss_info_change_notify( | |
133 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
134 | ||
b23b025f | 135 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
cfa6cb20 | 136 | netif_tx_stop_all_queues(sdata->dev); |
b23b025f BG |
137 | if (offchannel_ps_enable && |
138 | (sdata->vif.type == NL80211_IFTYPE_STATION) && | |
139 | sdata->u.mgd.associated) | |
559cef99 | 140 | ieee80211_offchannel_ps_enable(sdata); |
5b714c6a | 141 | } |
b203ffc3 JM |
142 | } |
143 | mutex_unlock(&local->iflist_mtx); | |
144 | } | |
145 | ||
b203ffc3 | 146 | void ieee80211_offchannel_return(struct ieee80211_local *local, |
b23b025f | 147 | bool offchannel_ps_disable) |
b203ffc3 JM |
148 | { |
149 | struct ieee80211_sub_if_data *sdata; | |
150 | ||
fe57d9f5 JB |
151 | if (WARN_ON(local->use_chanctx)) |
152 | return; | |
153 | ||
b203ffc3 JM |
154 | mutex_lock(&local->iflist_mtx); |
155 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f142c6b9 JB |
156 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
157 | continue; | |
158 | ||
f6e8cb72 EP |
159 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
160 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
161 | ||
b203ffc3 JM |
162 | if (!ieee80211_sdata_running(sdata)) |
163 | continue; | |
164 | ||
165 | /* Tell AP we're back */ | |
b23b025f BG |
166 | if (offchannel_ps_disable && |
167 | sdata->vif.type == NL80211_IFTYPE_STATION) { | |
b203ffc3 JM |
168 | if (sdata->u.mgd.associated) |
169 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
170 | } |
171 | ||
5b714c6a | 172 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
5b714c6a JB |
173 | /* |
174 | * This may wake up queues even though the driver | |
175 | * currently has them stopped. This is not very | |
176 | * likely, since the driver won't have gotten any | |
177 | * (or hardly any) new packets while we weren't | |
178 | * on the right channel, and even if it happens | |
179 | * it will at most lead to queueing up one more | |
180 | * packet per queue in mac80211 rather than on | |
181 | * the interface qdisc. | |
182 | */ | |
93895757 | 183 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 184 | } |
93895757 | 185 | |
e76aadc5 JB |
186 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
187 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
188 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
b203ffc3 JM |
189 | ieee80211_bss_info_change_notify( |
190 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
191 | } | |
192 | mutex_unlock(&local->iflist_mtx); | |
193 | } | |
21f83589 | 194 | |
2eb278e0 JB |
195 | void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc) |
196 | { | |
197 | if (roc->notified) | |
198 | return; | |
199 | ||
200 | if (roc->mgmt_tx_cookie) { | |
201 | if (!WARN_ON(!roc->frame)) { | |
55de908a JB |
202 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
203 | roc->chan->band); | |
2eb278e0 JB |
204 | roc->frame = NULL; |
205 | } | |
206 | } else { | |
50febf6a | 207 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
42d97a59 JB |
208 | roc->chan, roc->req_duration, |
209 | GFP_KERNEL); | |
2eb278e0 JB |
210 | } |
211 | ||
212 | roc->notified = true; | |
213 | } | |
214 | ||
21f83589 JB |
215 | static void ieee80211_hw_roc_start(struct work_struct *work) |
216 | { | |
217 | struct ieee80211_local *local = | |
218 | container_of(work, struct ieee80211_local, hw_roc_start); | |
2eb278e0 | 219 | struct ieee80211_roc_work *roc, *dep, *tmp; |
21f83589 JB |
220 | |
221 | mutex_lock(&local->mtx); | |
222 | ||
2eb278e0 JB |
223 | if (list_empty(&local->roc_list)) |
224 | goto out_unlock; | |
21f83589 | 225 | |
2eb278e0 JB |
226 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
227 | list); | |
228 | ||
229 | if (!roc->started) | |
230 | goto out_unlock; | |
231 | ||
232 | roc->hw_begun = true; | |
233 | roc->hw_start_time = local->hw_roc_start_time; | |
90fc4b3a | 234 | |
2eb278e0 JB |
235 | ieee80211_handle_roc_started(roc); |
236 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) { | |
237 | ieee80211_handle_roc_started(dep); | |
238 | ||
239 | if (dep->duration > roc->duration) { | |
240 | u32 dur = dep->duration; | |
241 | dep->duration = dur - roc->duration; | |
242 | roc->duration = dur; | |
a4ed5346 | 243 | list_move(&dep->list, &roc->list); |
2eb278e0 JB |
244 | } |
245 | } | |
246 | out_unlock: | |
21f83589 JB |
247 | mutex_unlock(&local->mtx); |
248 | } | |
249 | ||
250 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
251 | { | |
252 | struct ieee80211_local *local = hw_to_local(hw); | |
253 | ||
2eb278e0 JB |
254 | local->hw_roc_start_time = jiffies; |
255 | ||
21f83589 JB |
256 | trace_api_ready_on_channel(local); |
257 | ||
258 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
261 | ||
2eb278e0 | 262 | void ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 263 | { |
2eb278e0 | 264 | struct ieee80211_roc_work *roc; |
21f83589 | 265 | |
2eb278e0 | 266 | lockdep_assert_held(&local->mtx); |
21f83589 | 267 | |
2eb278e0 JB |
268 | if (list_empty(&local->roc_list)) { |
269 | ieee80211_run_deferred_scan(local); | |
21f83589 JB |
270 | return; |
271 | } | |
272 | ||
2eb278e0 JB |
273 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
274 | list); | |
71ecfa18 | 275 | |
0f6b3f59 JB |
276 | if (WARN_ON_ONCE(roc->started)) |
277 | return; | |
278 | ||
2eb278e0 JB |
279 | if (local->ops->remain_on_channel) { |
280 | int ret, duration = roc->duration; | |
71ecfa18 | 281 | |
2eb278e0 JB |
282 | /* XXX: duplicated, see ieee80211_start_roc_work() */ |
283 | if (!duration) | |
284 | duration = 10; | |
71ecfa18 | 285 | |
49884568 | 286 | ret = drv_remain_on_channel(local, roc->sdata, roc->chan, |
2eb278e0 JB |
287 | duration); |
288 | ||
289 | roc->started = true; | |
290 | ||
291 | if (ret) { | |
292 | wiphy_warn(local->hw.wiphy, | |
293 | "failed to start next HW ROC (%d)\n", ret); | |
294 | /* | |
295 | * queue the work struct again to avoid recursion | |
296 | * when multiple failures occur | |
297 | */ | |
298 | ieee80211_remain_on_channel_expired(&local->hw); | |
299 | } | |
300 | } else { | |
301 | /* delay it a bit */ | |
302 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
303 | round_jiffies_relative(HZ/2)); | |
304 | } | |
305 | } | |
306 | ||
307 | void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) | |
308 | { | |
309 | struct ieee80211_roc_work *dep, *tmp; | |
310 | ||
311 | /* was never transmitted */ | |
312 | if (roc->frame) { | |
71bbc994 | 313 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, |
2eb278e0 JB |
314 | (unsigned long)roc->frame, |
315 | roc->frame->data, roc->frame->len, | |
316 | false, GFP_KERNEL); | |
317 | kfree_skb(roc->frame); | |
71ecfa18 JB |
318 | } |
319 | ||
2eb278e0 | 320 | if (!roc->mgmt_tx_cookie) |
71bbc994 | 321 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, |
50febf6a | 322 | roc->cookie, roc->chan, |
42d97a59 | 323 | GFP_KERNEL); |
21f83589 | 324 | |
2eb278e0 JB |
325 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) |
326 | ieee80211_roc_notify_destroy(dep); | |
327 | ||
328 | kfree(roc); | |
329 | } | |
330 | ||
331 | void ieee80211_sw_roc_work(struct work_struct *work) | |
332 | { | |
333 | struct ieee80211_roc_work *roc = | |
334 | container_of(work, struct ieee80211_roc_work, work.work); | |
335 | struct ieee80211_sub_if_data *sdata = roc->sdata; | |
336 | struct ieee80211_local *local = sdata->local; | |
4b4b8229 | 337 | bool started; |
2eb278e0 JB |
338 | |
339 | mutex_lock(&local->mtx); | |
340 | ||
341 | if (roc->abort) | |
342 | goto finish; | |
343 | ||
344 | if (WARN_ON(list_empty(&local->roc_list))) | |
345 | goto out_unlock; | |
346 | ||
347 | if (WARN_ON(roc != list_first_entry(&local->roc_list, | |
348 | struct ieee80211_roc_work, | |
349 | list))) | |
350 | goto out_unlock; | |
351 | ||
352 | if (!roc->started) { | |
353 | struct ieee80211_roc_work *dep; | |
354 | ||
355 | /* start this ROC */ | |
21f83589 | 356 | |
2eb278e0 JB |
357 | /* switch channel etc */ |
358 | ieee80211_recalc_idle(local); | |
359 | ||
360 | local->tmp_channel = roc->chan; | |
2eb278e0 JB |
361 | ieee80211_hw_config(local, 0); |
362 | ||
363 | /* tell userspace or send frame */ | |
364 | ieee80211_handle_roc_started(roc); | |
365 | list_for_each_entry(dep, &roc->dependents, list) | |
366 | ieee80211_handle_roc_started(dep); | |
367 | ||
368 | /* if it was pure TX, just finish right away */ | |
369 | if (!roc->duration) | |
370 | goto finish; | |
371 | ||
372 | roc->started = true; | |
373 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
374 | msecs_to_jiffies(roc->duration)); | |
375 | } else { | |
376 | /* finish this ROC */ | |
377 | finish: | |
378 | list_del(&roc->list); | |
4b4b8229 | 379 | started = roc->started; |
2eb278e0 JB |
380 | ieee80211_roc_notify_destroy(roc); |
381 | ||
4b4b8229 | 382 | if (started) { |
2eb278e0 JB |
383 | drv_flush(local, false); |
384 | ||
385 | local->tmp_channel = NULL; | |
386 | ieee80211_hw_config(local, 0); | |
387 | ||
388 | ieee80211_offchannel_return(local, true); | |
389 | } | |
390 | ||
391 | ieee80211_recalc_idle(local); | |
392 | ||
4b4b8229 | 393 | if (started) |
0f6b3f59 | 394 | ieee80211_start_next_roc(local); |
2eb278e0 JB |
395 | } |
396 | ||
397 | out_unlock: | |
398 | mutex_unlock(&local->mtx); | |
399 | } | |
400 | ||
401 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
402 | { | |
403 | struct ieee80211_local *local = | |
404 | container_of(work, struct ieee80211_local, hw_roc_done); | |
405 | struct ieee80211_roc_work *roc; | |
406 | ||
407 | mutex_lock(&local->mtx); | |
408 | ||
409 | if (list_empty(&local->roc_list)) | |
410 | goto out_unlock; | |
411 | ||
412 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, | |
413 | list); | |
414 | ||
415 | if (!roc->started) | |
416 | goto out_unlock; | |
417 | ||
418 | list_del(&roc->list); | |
419 | ||
420 | ieee80211_roc_notify_destroy(roc); | |
421 | ||
422 | /* if there's another roc, start it now */ | |
423 | ieee80211_start_next_roc(local); | |
424 | ||
2eb278e0 | 425 | out_unlock: |
21f83589 JB |
426 | mutex_unlock(&local->mtx); |
427 | } | |
428 | ||
429 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
430 | { | |
431 | struct ieee80211_local *local = hw_to_local(hw); | |
432 | ||
433 | trace_api_remain_on_channel_expired(local); | |
434 | ||
435 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
438 | ||
2eb278e0 | 439 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
440 | { |
441 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
442 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
2eb278e0 JB |
443 | INIT_LIST_HEAD(&local->roc_list); |
444 | } | |
445 | ||
446 | void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata) | |
447 | { | |
448 | struct ieee80211_local *local = sdata->local; | |
449 | struct ieee80211_roc_work *roc, *tmp; | |
450 | LIST_HEAD(tmp_list); | |
451 | ||
452 | mutex_lock(&local->mtx); | |
453 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
454 | if (roc->sdata != sdata) | |
455 | continue; | |
456 | ||
457 | if (roc->started && local->ops->remain_on_channel) { | |
458 | /* can race, so ignore return value */ | |
459 | drv_cancel_remain_on_channel(local); | |
460 | } | |
461 | ||
462 | list_move_tail(&roc->list, &tmp_list); | |
463 | roc->abort = true; | |
464 | } | |
465 | ||
466 | ieee80211_start_next_roc(local); | |
2eb278e0 JB |
467 | mutex_unlock(&local->mtx); |
468 | ||
469 | list_for_each_entry_safe(roc, tmp, &tmp_list, list) { | |
470 | if (local->ops->remain_on_channel) { | |
471 | list_del(&roc->list); | |
472 | ieee80211_roc_notify_destroy(roc); | |
473 | } else { | |
474 | ieee80211_queue_delayed_work(&local->hw, &roc->work, 0); | |
475 | ||
476 | /* work will clean up etc */ | |
477 | flush_delayed_work(&roc->work); | |
478 | } | |
479 | } | |
480 | ||
481 | WARN_ON_ONCE(!list_empty(&tmp_list)); | |
21f83589 | 482 | } |