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" | |
21f83589 | 18 | #include "driver-trace.h" |
2eb278e0 | 19 | #include "driver-ops.h" |
b203ffc3 JM |
20 | |
21 | /* | |
b23b025f BG |
22 | * Tell our hardware to disable PS. |
23 | * Optionally inform AP that we will go to sleep so that it will buffer | |
24 | * the frames while we are doing off-channel work. This is optional | |
25 | * because we *may* be doing work on-operating channel, and want our | |
26 | * hardware unconditionally awake, but still let the AP send us normal frames. | |
b203ffc3 | 27 | */ |
559cef99 | 28 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) |
b203ffc3 JM |
29 | { |
30 | struct ieee80211_local *local = sdata->local; | |
4730d597 | 31 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
32 | |
33 | local->offchannel_ps_enabled = false; | |
34 | ||
35 | /* FIXME: what to do when local->pspolling is true? */ | |
36 | ||
37 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 38 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
39 | del_timer_sync(&ifmgd->conn_mon_timer); |
40 | ||
b203ffc3 JM |
41 | cancel_work_sync(&local->dynamic_ps_enable_work); |
42 | ||
43 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
44 | local->offchannel_ps_enabled = true; | |
45 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
46 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
47 | } | |
48 | ||
559cef99 RM |
49 | if (!local->offchannel_ps_enabled || |
50 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
b203ffc3 JM |
51 | /* |
52 | * If power save was enabled, no need to send a nullfunc | |
53 | * frame because AP knows that we are sleeping. But if the | |
54 | * hardware is creating the nullfunc frame for power save | |
55 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
56 | * enabled) and power save was enabled, the firmware just | |
57 | * sent a null frame with power save disabled. So we need | |
58 | * to send a new nullfunc frame to inform the AP that we | |
59 | * are again sleeping. | |
60 | */ | |
61 | ieee80211_send_nullfunc(local, sdata, 1); | |
62 | } | |
63 | ||
64 | /* inform AP that we are awake again, unless power save is enabled */ | |
65 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
66 | { | |
67 | struct ieee80211_local *local = sdata->local; | |
68 | ||
69 | if (!local->ps_sdata) | |
70 | ieee80211_send_nullfunc(local, sdata, 0); | |
71 | else if (local->offchannel_ps_enabled) { | |
72 | /* | |
73 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
74 | * will send a nullfunc frame with the powersave bit set | |
75 | * even though the AP already knows that we are sleeping. | |
76 | * This could be avoided by sending a null frame with power | |
77 | * save bit disabled before enabling the power save, but | |
78 | * this doesn't gain anything. | |
79 | * | |
80 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
81 | * to send a nullfunc frame because AP already knows that | |
82 | * we are sleeping, let's just enable power save mode in | |
83 | * hardware. | |
84 | */ | |
b23b025f BG |
85 | /* TODO: Only set hardware if CONF_PS changed? |
86 | * TODO: Should we set offchannel_ps_enabled to false? | |
87 | */ | |
b203ffc3 JM |
88 | local->hw.conf.flags |= IEEE80211_CONF_PS; |
89 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
90 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
91 | /* | |
92 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
93 | * had been running before leaving the operating channel, | |
94 | * restart the timer now and send a nullfunc frame to inform | |
95 | * the AP that we are awake. | |
96 | */ | |
97 | ieee80211_send_nullfunc(local, sdata, 0); | |
98 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
99 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
100 | } | |
4730d597 | 101 | |
3bc3c0d7 | 102 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 103 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
104 | } |
105 | ||
b23b025f BG |
106 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local, |
107 | bool offchannel_ps_enable) | |
b203ffc3 JM |
108 | { |
109 | struct ieee80211_sub_if_data *sdata; | |
110 | ||
b23b025f BG |
111 | /* |
112 | * notify the AP about us leaving the channel and stop all | |
113 | * STA interfaces. | |
114 | */ | |
b203ffc3 JM |
115 | mutex_lock(&local->iflist_mtx); |
116 | list_for_each_entry(sdata, &local->interfaces, list) { | |
117 | if (!ieee80211_sdata_running(sdata)) | |
118 | continue; | |
119 | ||
b23b025f BG |
120 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
121 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
122 | ||
123 | /* Check to see if we should disable beaconing. */ | |
b203ffc3 JM |
124 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
125 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
126 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
127 | ieee80211_bss_info_change_notify( | |
128 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
129 | ||
b23b025f | 130 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
cfa6cb20 | 131 | netif_tx_stop_all_queues(sdata->dev); |
b23b025f BG |
132 | if (offchannel_ps_enable && |
133 | (sdata->vif.type == NL80211_IFTYPE_STATION) && | |
134 | sdata->u.mgd.associated) | |
559cef99 | 135 | ieee80211_offchannel_ps_enable(sdata); |
5b714c6a | 136 | } |
b203ffc3 JM |
137 | } |
138 | mutex_unlock(&local->iflist_mtx); | |
139 | } | |
140 | ||
b203ffc3 | 141 | void ieee80211_offchannel_return(struct ieee80211_local *local, |
b23b025f | 142 | bool offchannel_ps_disable) |
b203ffc3 JM |
143 | { |
144 | struct ieee80211_sub_if_data *sdata; | |
145 | ||
146 | mutex_lock(&local->iflist_mtx); | |
147 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f6e8cb72 EP |
148 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
149 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
150 | ||
b203ffc3 JM |
151 | if (!ieee80211_sdata_running(sdata)) |
152 | continue; | |
153 | ||
154 | /* Tell AP we're back */ | |
b23b025f BG |
155 | if (offchannel_ps_disable && |
156 | sdata->vif.type == NL80211_IFTYPE_STATION) { | |
b203ffc3 JM |
157 | if (sdata->u.mgd.associated) |
158 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
159 | } |
160 | ||
5b714c6a | 161 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
5b714c6a JB |
162 | /* |
163 | * This may wake up queues even though the driver | |
164 | * currently has them stopped. This is not very | |
165 | * likely, since the driver won't have gotten any | |
166 | * (or hardly any) new packets while we weren't | |
167 | * on the right channel, and even if it happens | |
168 | * it will at most lead to queueing up one more | |
169 | * packet per queue in mac80211 rather than on | |
170 | * the interface qdisc. | |
171 | */ | |
93895757 | 172 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 173 | } |
93895757 | 174 | |
e76aadc5 JB |
175 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
176 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
177 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
b203ffc3 JM |
178 | ieee80211_bss_info_change_notify( |
179 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
180 | } | |
181 | mutex_unlock(&local->iflist_mtx); | |
182 | } | |
21f83589 | 183 | |
2eb278e0 JB |
184 | void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc) |
185 | { | |
186 | if (roc->notified) | |
187 | return; | |
188 | ||
189 | if (roc->mgmt_tx_cookie) { | |
190 | if (!WARN_ON(!roc->frame)) { | |
191 | ieee80211_tx_skb(roc->sdata, roc->frame); | |
192 | roc->frame = NULL; | |
193 | } | |
194 | } else { | |
195 | cfg80211_ready_on_channel(roc->sdata->dev, (unsigned long)roc, | |
196 | roc->chan, roc->chan_type, | |
197 | roc->req_duration, GFP_KERNEL); | |
198 | } | |
199 | ||
200 | roc->notified = true; | |
201 | } | |
202 | ||
21f83589 JB |
203 | static void ieee80211_hw_roc_start(struct work_struct *work) |
204 | { | |
205 | struct ieee80211_local *local = | |
206 | container_of(work, struct ieee80211_local, hw_roc_start); | |
2eb278e0 | 207 | struct ieee80211_roc_work *roc, *dep, *tmp; |
21f83589 JB |
208 | |
209 | mutex_lock(&local->mtx); | |
210 | ||
2eb278e0 JB |
211 | if (list_empty(&local->roc_list)) |
212 | goto out_unlock; | |
21f83589 | 213 | |
2eb278e0 JB |
214 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
215 | list); | |
216 | ||
217 | if (!roc->started) | |
218 | goto out_unlock; | |
219 | ||
220 | roc->hw_begun = true; | |
221 | roc->hw_start_time = local->hw_roc_start_time; | |
90fc4b3a | 222 | |
2eb278e0 JB |
223 | ieee80211_handle_roc_started(roc); |
224 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) { | |
225 | ieee80211_handle_roc_started(dep); | |
226 | ||
227 | if (dep->duration > roc->duration) { | |
228 | u32 dur = dep->duration; | |
229 | dep->duration = dur - roc->duration; | |
230 | roc->duration = dur; | |
231 | list_del(&dep->list); | |
232 | list_add(&dep->list, &roc->list); | |
233 | } | |
234 | } | |
235 | out_unlock: | |
21f83589 JB |
236 | mutex_unlock(&local->mtx); |
237 | } | |
238 | ||
239 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
240 | { | |
241 | struct ieee80211_local *local = hw_to_local(hw); | |
242 | ||
2eb278e0 JB |
243 | local->hw_roc_start_time = jiffies; |
244 | ||
21f83589 JB |
245 | trace_api_ready_on_channel(local); |
246 | ||
247 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
250 | ||
2eb278e0 | 251 | void ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 252 | { |
2eb278e0 | 253 | struct ieee80211_roc_work *roc; |
21f83589 | 254 | |
2eb278e0 | 255 | lockdep_assert_held(&local->mtx); |
21f83589 | 256 | |
2eb278e0 JB |
257 | if (list_empty(&local->roc_list)) { |
258 | ieee80211_run_deferred_scan(local); | |
21f83589 JB |
259 | return; |
260 | } | |
261 | ||
2eb278e0 JB |
262 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
263 | list); | |
71ecfa18 | 264 | |
2eb278e0 JB |
265 | if (local->ops->remain_on_channel) { |
266 | int ret, duration = roc->duration; | |
71ecfa18 | 267 | |
2eb278e0 JB |
268 | /* XXX: duplicated, see ieee80211_start_roc_work() */ |
269 | if (!duration) | |
270 | duration = 10; | |
71ecfa18 | 271 | |
2eb278e0 JB |
272 | ret = drv_remain_on_channel(local, roc->chan, |
273 | roc->chan_type, | |
274 | duration); | |
275 | ||
276 | roc->started = true; | |
277 | ||
278 | if (ret) { | |
279 | wiphy_warn(local->hw.wiphy, | |
280 | "failed to start next HW ROC (%d)\n", ret); | |
281 | /* | |
282 | * queue the work struct again to avoid recursion | |
283 | * when multiple failures occur | |
284 | */ | |
285 | ieee80211_remain_on_channel_expired(&local->hw); | |
286 | } | |
287 | } else { | |
288 | /* delay it a bit */ | |
289 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
290 | round_jiffies_relative(HZ/2)); | |
291 | } | |
292 | } | |
293 | ||
294 | void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) | |
295 | { | |
296 | struct ieee80211_roc_work *dep, *tmp; | |
297 | ||
298 | /* was never transmitted */ | |
299 | if (roc->frame) { | |
300 | cfg80211_mgmt_tx_status(roc->sdata->dev, | |
301 | (unsigned long)roc->frame, | |
302 | roc->frame->data, roc->frame->len, | |
303 | false, GFP_KERNEL); | |
304 | kfree_skb(roc->frame); | |
71ecfa18 JB |
305 | } |
306 | ||
2eb278e0 JB |
307 | if (!roc->mgmt_tx_cookie) |
308 | cfg80211_remain_on_channel_expired(roc->sdata->dev, | |
309 | (unsigned long)roc, | |
310 | roc->chan, roc->chan_type, | |
90fc4b3a | 311 | GFP_KERNEL); |
21f83589 | 312 | |
2eb278e0 JB |
313 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) |
314 | ieee80211_roc_notify_destroy(dep); | |
315 | ||
316 | kfree(roc); | |
317 | } | |
318 | ||
319 | void ieee80211_sw_roc_work(struct work_struct *work) | |
320 | { | |
321 | struct ieee80211_roc_work *roc = | |
322 | container_of(work, struct ieee80211_roc_work, work.work); | |
323 | struct ieee80211_sub_if_data *sdata = roc->sdata; | |
324 | struct ieee80211_local *local = sdata->local; | |
325 | ||
326 | mutex_lock(&local->mtx); | |
327 | ||
328 | if (roc->abort) | |
329 | goto finish; | |
330 | ||
331 | if (WARN_ON(list_empty(&local->roc_list))) | |
332 | goto out_unlock; | |
333 | ||
334 | if (WARN_ON(roc != list_first_entry(&local->roc_list, | |
335 | struct ieee80211_roc_work, | |
336 | list))) | |
337 | goto out_unlock; | |
338 | ||
339 | if (!roc->started) { | |
340 | struct ieee80211_roc_work *dep; | |
341 | ||
342 | /* start this ROC */ | |
21f83589 | 343 | |
2eb278e0 JB |
344 | /* switch channel etc */ |
345 | ieee80211_recalc_idle(local); | |
346 | ||
347 | local->tmp_channel = roc->chan; | |
348 | local->tmp_channel_type = roc->chan_type; | |
349 | ieee80211_hw_config(local, 0); | |
350 | ||
351 | /* tell userspace or send frame */ | |
352 | ieee80211_handle_roc_started(roc); | |
353 | list_for_each_entry(dep, &roc->dependents, list) | |
354 | ieee80211_handle_roc_started(dep); | |
355 | ||
356 | /* if it was pure TX, just finish right away */ | |
357 | if (!roc->duration) | |
358 | goto finish; | |
359 | ||
360 | roc->started = true; | |
361 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
362 | msecs_to_jiffies(roc->duration)); | |
363 | } else { | |
364 | /* finish this ROC */ | |
365 | finish: | |
366 | list_del(&roc->list); | |
367 | ieee80211_roc_notify_destroy(roc); | |
368 | ||
369 | if (roc->started) { | |
370 | drv_flush(local, false); | |
371 | ||
372 | local->tmp_channel = NULL; | |
373 | ieee80211_hw_config(local, 0); | |
374 | ||
375 | ieee80211_offchannel_return(local, true); | |
376 | } | |
377 | ||
378 | ieee80211_recalc_idle(local); | |
379 | ||
380 | ieee80211_start_next_roc(local); | |
2eb278e0 JB |
381 | } |
382 | ||
383 | out_unlock: | |
384 | mutex_unlock(&local->mtx); | |
385 | } | |
386 | ||
387 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
388 | { | |
389 | struct ieee80211_local *local = | |
390 | container_of(work, struct ieee80211_local, hw_roc_done); | |
391 | struct ieee80211_roc_work *roc; | |
392 | ||
393 | mutex_lock(&local->mtx); | |
394 | ||
395 | if (list_empty(&local->roc_list)) | |
396 | goto out_unlock; | |
397 | ||
398 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, | |
399 | list); | |
400 | ||
401 | if (!roc->started) | |
402 | goto out_unlock; | |
403 | ||
404 | list_del(&roc->list); | |
405 | ||
406 | ieee80211_roc_notify_destroy(roc); | |
407 | ||
408 | /* if there's another roc, start it now */ | |
409 | ieee80211_start_next_roc(local); | |
410 | ||
2eb278e0 | 411 | out_unlock: |
21f83589 JB |
412 | mutex_unlock(&local->mtx); |
413 | } | |
414 | ||
415 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
416 | { | |
417 | struct ieee80211_local *local = hw_to_local(hw); | |
418 | ||
419 | trace_api_remain_on_channel_expired(local); | |
420 | ||
421 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
424 | ||
2eb278e0 | 425 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
426 | { |
427 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
428 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
2eb278e0 JB |
429 | INIT_LIST_HEAD(&local->roc_list); |
430 | } | |
431 | ||
432 | void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata) | |
433 | { | |
434 | struct ieee80211_local *local = sdata->local; | |
435 | struct ieee80211_roc_work *roc, *tmp; | |
436 | LIST_HEAD(tmp_list); | |
437 | ||
438 | mutex_lock(&local->mtx); | |
439 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
440 | if (roc->sdata != sdata) | |
441 | continue; | |
442 | ||
443 | if (roc->started && local->ops->remain_on_channel) { | |
444 | /* can race, so ignore return value */ | |
445 | drv_cancel_remain_on_channel(local); | |
446 | } | |
447 | ||
448 | list_move_tail(&roc->list, &tmp_list); | |
449 | roc->abort = true; | |
450 | } | |
451 | ||
452 | ieee80211_start_next_roc(local); | |
2eb278e0 JB |
453 | mutex_unlock(&local->mtx); |
454 | ||
455 | list_for_each_entry_safe(roc, tmp, &tmp_list, list) { | |
456 | if (local->ops->remain_on_channel) { | |
457 | list_del(&roc->list); | |
458 | ieee80211_roc_notify_destroy(roc); | |
459 | } else { | |
460 | ieee80211_queue_delayed_work(&local->hw, &roc->work, 0); | |
461 | ||
462 | /* work will clean up etc */ | |
463 | flush_delayed_work(&roc->work); | |
464 | } | |
465 | } | |
466 | ||
467 | WARN_ON_ONCE(!list_empty(&tmp_list)); | |
21f83589 | 468 | } |