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 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 | ||
b23b025f BG |
110 | /* |
111 | * notify the AP about us leaving the channel and stop all | |
112 | * STA interfaces. | |
113 | */ | |
b203ffc3 JM |
114 | mutex_lock(&local->iflist_mtx); |
115 | list_for_each_entry(sdata, &local->interfaces, list) { | |
116 | if (!ieee80211_sdata_running(sdata)) | |
117 | continue; | |
118 | ||
b23b025f BG |
119 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
120 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
121 | ||
122 | /* Check to see if we should disable beaconing. */ | |
b203ffc3 JM |
123 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
124 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
125 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
126 | ieee80211_bss_info_change_notify( | |
127 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
128 | ||
b23b025f | 129 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
cfa6cb20 | 130 | netif_tx_stop_all_queues(sdata->dev); |
b23b025f BG |
131 | if (offchannel_ps_enable && |
132 | (sdata->vif.type == NL80211_IFTYPE_STATION) && | |
133 | sdata->u.mgd.associated) | |
559cef99 | 134 | ieee80211_offchannel_ps_enable(sdata); |
5b714c6a | 135 | } |
b203ffc3 JM |
136 | } |
137 | mutex_unlock(&local->iflist_mtx); | |
138 | } | |
139 | ||
b203ffc3 | 140 | void ieee80211_offchannel_return(struct ieee80211_local *local, |
b23b025f | 141 | bool offchannel_ps_disable) |
b203ffc3 JM |
142 | { |
143 | struct ieee80211_sub_if_data *sdata; | |
144 | ||
145 | mutex_lock(&local->iflist_mtx); | |
146 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f6e8cb72 EP |
147 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
148 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
149 | ||
b203ffc3 JM |
150 | if (!ieee80211_sdata_running(sdata)) |
151 | continue; | |
152 | ||
153 | /* Tell AP we're back */ | |
b23b025f BG |
154 | if (offchannel_ps_disable && |
155 | sdata->vif.type == NL80211_IFTYPE_STATION) { | |
b203ffc3 JM |
156 | if (sdata->u.mgd.associated) |
157 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
158 | } |
159 | ||
5b714c6a | 160 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
5b714c6a JB |
161 | /* |
162 | * This may wake up queues even though the driver | |
163 | * currently has them stopped. This is not very | |
164 | * likely, since the driver won't have gotten any | |
165 | * (or hardly any) new packets while we weren't | |
166 | * on the right channel, and even if it happens | |
167 | * it will at most lead to queueing up one more | |
168 | * packet per queue in mac80211 rather than on | |
169 | * the interface qdisc. | |
170 | */ | |
93895757 | 171 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 172 | } |
93895757 | 173 | |
e76aadc5 JB |
174 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
175 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
176 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
b203ffc3 JM |
177 | ieee80211_bss_info_change_notify( |
178 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
179 | } | |
180 | mutex_unlock(&local->iflist_mtx); | |
181 | } | |
21f83589 | 182 | |
2eb278e0 JB |
183 | void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc) |
184 | { | |
185 | if (roc->notified) | |
186 | return; | |
187 | ||
188 | if (roc->mgmt_tx_cookie) { | |
189 | if (!WARN_ON(!roc->frame)) { | |
190 | ieee80211_tx_skb(roc->sdata, roc->frame); | |
191 | roc->frame = NULL; | |
192 | } | |
193 | } else { | |
71bbc994 | 194 | cfg80211_ready_on_channel(&roc->sdata->wdev, (unsigned long)roc, |
2eb278e0 JB |
195 | roc->chan, roc->chan_type, |
196 | roc->req_duration, GFP_KERNEL); | |
197 | } | |
198 | ||
199 | roc->notified = true; | |
200 | } | |
201 | ||
21f83589 JB |
202 | static void ieee80211_hw_roc_start(struct work_struct *work) |
203 | { | |
204 | struct ieee80211_local *local = | |
205 | container_of(work, struct ieee80211_local, hw_roc_start); | |
2eb278e0 | 206 | struct ieee80211_roc_work *roc, *dep, *tmp; |
21f83589 JB |
207 | |
208 | mutex_lock(&local->mtx); | |
209 | ||
2eb278e0 JB |
210 | if (list_empty(&local->roc_list)) |
211 | goto out_unlock; | |
21f83589 | 212 | |
2eb278e0 JB |
213 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
214 | list); | |
215 | ||
216 | if (!roc->started) | |
217 | goto out_unlock; | |
218 | ||
219 | roc->hw_begun = true; | |
220 | roc->hw_start_time = local->hw_roc_start_time; | |
90fc4b3a | 221 | |
2eb278e0 JB |
222 | ieee80211_handle_roc_started(roc); |
223 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) { | |
224 | ieee80211_handle_roc_started(dep); | |
225 | ||
226 | if (dep->duration > roc->duration) { | |
227 | u32 dur = dep->duration; | |
228 | dep->duration = dur - roc->duration; | |
229 | roc->duration = dur; | |
230 | list_del(&dep->list); | |
231 | list_add(&dep->list, &roc->list); | |
232 | } | |
233 | } | |
234 | out_unlock: | |
21f83589 JB |
235 | mutex_unlock(&local->mtx); |
236 | } | |
237 | ||
238 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
239 | { | |
240 | struct ieee80211_local *local = hw_to_local(hw); | |
241 | ||
2eb278e0 JB |
242 | local->hw_roc_start_time = jiffies; |
243 | ||
21f83589 JB |
244 | trace_api_ready_on_channel(local); |
245 | ||
246 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
247 | } | |
248 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
249 | ||
2eb278e0 | 250 | void ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 251 | { |
2eb278e0 | 252 | struct ieee80211_roc_work *roc; |
21f83589 | 253 | |
2eb278e0 | 254 | lockdep_assert_held(&local->mtx); |
21f83589 | 255 | |
2eb278e0 JB |
256 | if (list_empty(&local->roc_list)) { |
257 | ieee80211_run_deferred_scan(local); | |
21f83589 JB |
258 | return; |
259 | } | |
260 | ||
2eb278e0 JB |
261 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
262 | list); | |
71ecfa18 | 263 | |
0f6b3f59 JB |
264 | if (WARN_ON_ONCE(roc->started)) |
265 | return; | |
266 | ||
2eb278e0 JB |
267 | if (local->ops->remain_on_channel) { |
268 | int ret, duration = roc->duration; | |
71ecfa18 | 269 | |
2eb278e0 JB |
270 | /* XXX: duplicated, see ieee80211_start_roc_work() */ |
271 | if (!duration) | |
272 | duration = 10; | |
71ecfa18 | 273 | |
2eb278e0 JB |
274 | ret = drv_remain_on_channel(local, roc->chan, |
275 | roc->chan_type, | |
276 | duration); | |
277 | ||
278 | roc->started = true; | |
279 | ||
280 | if (ret) { | |
281 | wiphy_warn(local->hw.wiphy, | |
282 | "failed to start next HW ROC (%d)\n", ret); | |
283 | /* | |
284 | * queue the work struct again to avoid recursion | |
285 | * when multiple failures occur | |
286 | */ | |
287 | ieee80211_remain_on_channel_expired(&local->hw); | |
288 | } | |
289 | } else { | |
290 | /* delay it a bit */ | |
291 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
292 | round_jiffies_relative(HZ/2)); | |
293 | } | |
294 | } | |
295 | ||
296 | void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) | |
297 | { | |
298 | struct ieee80211_roc_work *dep, *tmp; | |
299 | ||
300 | /* was never transmitted */ | |
301 | if (roc->frame) { | |
71bbc994 | 302 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, |
2eb278e0 JB |
303 | (unsigned long)roc->frame, |
304 | roc->frame->data, roc->frame->len, | |
305 | false, GFP_KERNEL); | |
306 | kfree_skb(roc->frame); | |
71ecfa18 JB |
307 | } |
308 | ||
2eb278e0 | 309 | if (!roc->mgmt_tx_cookie) |
71bbc994 | 310 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, |
2eb278e0 JB |
311 | (unsigned long)roc, |
312 | roc->chan, roc->chan_type, | |
90fc4b3a | 313 | GFP_KERNEL); |
21f83589 | 314 | |
2eb278e0 JB |
315 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) |
316 | ieee80211_roc_notify_destroy(dep); | |
317 | ||
318 | kfree(roc); | |
319 | } | |
320 | ||
321 | void ieee80211_sw_roc_work(struct work_struct *work) | |
322 | { | |
323 | struct ieee80211_roc_work *roc = | |
324 | container_of(work, struct ieee80211_roc_work, work.work); | |
325 | struct ieee80211_sub_if_data *sdata = roc->sdata; | |
326 | struct ieee80211_local *local = sdata->local; | |
4b4b8229 | 327 | bool started; |
2eb278e0 JB |
328 | |
329 | mutex_lock(&local->mtx); | |
330 | ||
331 | if (roc->abort) | |
332 | goto finish; | |
333 | ||
334 | if (WARN_ON(list_empty(&local->roc_list))) | |
335 | goto out_unlock; | |
336 | ||
337 | if (WARN_ON(roc != list_first_entry(&local->roc_list, | |
338 | struct ieee80211_roc_work, | |
339 | list))) | |
340 | goto out_unlock; | |
341 | ||
342 | if (!roc->started) { | |
343 | struct ieee80211_roc_work *dep; | |
344 | ||
345 | /* start this ROC */ | |
21f83589 | 346 | |
2eb278e0 JB |
347 | /* switch channel etc */ |
348 | ieee80211_recalc_idle(local); | |
349 | ||
350 | local->tmp_channel = roc->chan; | |
351 | local->tmp_channel_type = roc->chan_type; | |
352 | ieee80211_hw_config(local, 0); | |
353 | ||
354 | /* tell userspace or send frame */ | |
355 | ieee80211_handle_roc_started(roc); | |
356 | list_for_each_entry(dep, &roc->dependents, list) | |
357 | ieee80211_handle_roc_started(dep); | |
358 | ||
359 | /* if it was pure TX, just finish right away */ | |
360 | if (!roc->duration) | |
361 | goto finish; | |
362 | ||
363 | roc->started = true; | |
364 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
365 | msecs_to_jiffies(roc->duration)); | |
366 | } else { | |
367 | /* finish this ROC */ | |
368 | finish: | |
369 | list_del(&roc->list); | |
4b4b8229 | 370 | started = roc->started; |
2eb278e0 JB |
371 | ieee80211_roc_notify_destroy(roc); |
372 | ||
4b4b8229 | 373 | if (started) { |
2eb278e0 JB |
374 | drv_flush(local, false); |
375 | ||
376 | local->tmp_channel = NULL; | |
377 | ieee80211_hw_config(local, 0); | |
378 | ||
379 | ieee80211_offchannel_return(local, true); | |
380 | } | |
381 | ||
382 | ieee80211_recalc_idle(local); | |
383 | ||
4b4b8229 | 384 | if (started) |
0f6b3f59 | 385 | ieee80211_start_next_roc(local); |
2eb278e0 JB |
386 | } |
387 | ||
388 | out_unlock: | |
389 | mutex_unlock(&local->mtx); | |
390 | } | |
391 | ||
392 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
393 | { | |
394 | struct ieee80211_local *local = | |
395 | container_of(work, struct ieee80211_local, hw_roc_done); | |
396 | struct ieee80211_roc_work *roc; | |
397 | ||
398 | mutex_lock(&local->mtx); | |
399 | ||
400 | if (list_empty(&local->roc_list)) | |
401 | goto out_unlock; | |
402 | ||
403 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, | |
404 | list); | |
405 | ||
406 | if (!roc->started) | |
407 | goto out_unlock; | |
408 | ||
409 | list_del(&roc->list); | |
410 | ||
411 | ieee80211_roc_notify_destroy(roc); | |
412 | ||
413 | /* if there's another roc, start it now */ | |
414 | ieee80211_start_next_roc(local); | |
415 | ||
2eb278e0 | 416 | out_unlock: |
21f83589 JB |
417 | mutex_unlock(&local->mtx); |
418 | } | |
419 | ||
420 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
421 | { | |
422 | struct ieee80211_local *local = hw_to_local(hw); | |
423 | ||
424 | trace_api_remain_on_channel_expired(local); | |
425 | ||
426 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
429 | ||
2eb278e0 | 430 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
431 | { |
432 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
433 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
2eb278e0 JB |
434 | INIT_LIST_HEAD(&local->roc_list); |
435 | } | |
436 | ||
437 | void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata) | |
438 | { | |
439 | struct ieee80211_local *local = sdata->local; | |
440 | struct ieee80211_roc_work *roc, *tmp; | |
441 | LIST_HEAD(tmp_list); | |
442 | ||
443 | mutex_lock(&local->mtx); | |
444 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
445 | if (roc->sdata != sdata) | |
446 | continue; | |
447 | ||
448 | if (roc->started && local->ops->remain_on_channel) { | |
449 | /* can race, so ignore return value */ | |
450 | drv_cancel_remain_on_channel(local); | |
451 | } | |
452 | ||
453 | list_move_tail(&roc->list, &tmp_list); | |
454 | roc->abort = true; | |
455 | } | |
456 | ||
457 | ieee80211_start_next_roc(local); | |
2eb278e0 JB |
458 | mutex_unlock(&local->mtx); |
459 | ||
460 | list_for_each_entry_safe(roc, tmp, &tmp_list, list) { | |
461 | if (local->ops->remain_on_channel) { | |
462 | list_del(&roc->list); | |
463 | ieee80211_roc_notify_destroy(roc); | |
464 | } else { | |
465 | ieee80211_queue_delayed_work(&local->hw, &roc->work, 0); | |
466 | ||
467 | /* work will clean up etc */ | |
468 | flush_delayed_work(&roc->work); | |
469 | } | |
470 | } | |
471 | ||
472 | WARN_ON_ONCE(!list_empty(&tmp_list)); | |
21f83589 | 473 | } |