blob: 8c047fc8b3259456a6d052a635342d286d9601e6 [file] [log] [blame]
Jouni Malinenb203ffc2009-12-23 13:15:40 +01001/*
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 */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040015#include <linux/export.h>
Jouni Malinenb203ffc2009-12-23 13:15:40 +010016#include <net/mac80211.h>
17#include "ieee80211_i.h"
Johannes Berg2eb278e2012-06-05 14:28:42 +020018#include "driver-ops.h"
Jouni Malinenb203ffc2009-12-23 13:15:40 +010019
20/*
Ben Greearb23b0252011-02-04 11:54:17 -080021 * 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.
Jouni Malinenb203ffc2009-12-23 13:15:40 +010026 */
Rajkumar Manoharan559cef92012-06-18 19:03:52 +053027static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata)
Jouni Malinenb203ffc2009-12-23 13:15:40 +010028{
29 struct ieee80211_local *local = sdata->local;
Luis R. Rodriguez4730d592010-09-16 15:12:31 -040030 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
Jouni Malinenb203ffc2009-12-23 13:15:40 +010031
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);
Luis R. Rodriguez3bc3c0d2010-09-16 15:12:33 -040037 del_timer_sync(&ifmgd->bcn_mon_timer);
Luis R. Rodriguez4730d592010-09-16 15:12:31 -040038 del_timer_sync(&ifmgd->conn_mon_timer);
39
Jouni Malinenb203ffc2009-12-23 13:15:40 +010040 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
Rajkumar Manoharan559cef92012-06-18 19:03:52 +053048 if (!local->offchannel_ps_enabled ||
49 !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
Jouni Malinenb203ffc2009-12-23 13:15:40 +010050 /*
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 */
64static 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 */
Ben Greearb23b0252011-02-04 11:54:17 -080084 /* TODO: Only set hardware if CONF_PS changed?
85 * TODO: Should we set offchannel_ps_enabled to false?
86 */
Jouni Malinenb203ffc2009-12-23 13:15:40 +010087 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 }
Luis R. Rodriguez4730d592010-09-16 15:12:31 -0400100
Luis R. Rodriguez3bc3c0d2010-09-16 15:12:33 -0400101 ieee80211_sta_reset_beacon_monitor(sdata);
Luis R. Rodriguez4730d592010-09-16 15:12:31 -0400102 ieee80211_sta_reset_conn_monitor(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100103}
104
Ben Greearb23b0252011-02-04 11:54:17 -0800105void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
106 bool offchannel_ps_enable)
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100107{
108 struct ieee80211_sub_if_data *sdata;
109
110 /*
Ben Greearb23b0252011-02-04 11:54:17 -0800111 * notify the AP about us leaving the channel and stop all
112 * STA interfaces.
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100113 */
114 mutex_lock(&local->iflist_mtx);
115 list_for_each_entry(sdata, &local->interfaces, list) {
116 if (!ieee80211_sdata_running(sdata))
117 continue;
118
Ben Greearb23b0252011-02-04 11:54:17 -0800119 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Berg5b714c62010-08-27 13:45:28 +0200120 set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
Ben Greearb23b0252011-02-04 11:54:17 -0800121
122 /* Check to see if we should disable beaconing. */
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
129 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
John W. Linvillecfa6cb22010-01-06 17:22:54 -0500130 netif_tx_stop_all_queues(sdata->dev);
Ben Greearb23b0252011-02-04 11:54:17 -0800131 if (offchannel_ps_enable &&
132 (sdata->vif.type == NL80211_IFTYPE_STATION) &&
133 sdata->u.mgd.associated)
Rajkumar Manoharan559cef92012-06-18 19:03:52 +0530134 ieee80211_offchannel_ps_enable(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100135 }
136 }
137 mutex_unlock(&local->iflist_mtx);
138}
139
140void ieee80211_offchannel_return(struct ieee80211_local *local,
Ben Greearb23b0252011-02-04 11:54:17 -0800141 bool offchannel_ps_disable)
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100142{
143 struct ieee80211_sub_if_data *sdata;
144
145 mutex_lock(&local->iflist_mtx);
146 list_for_each_entry(sdata, &local->interfaces, list) {
Eliad Pellerf6e8cb72011-12-23 01:48:06 +0200147 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
148 clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
149
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100150 if (!ieee80211_sdata_running(sdata))
151 continue;
152
153 /* Tell AP we're back */
Ben Greearb23b0252011-02-04 11:54:17 -0800154 if (offchannel_ps_disable &&
155 sdata->vif.type == NL80211_IFTYPE_STATION) {
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100156 if (sdata->u.mgd.associated)
157 ieee80211_offchannel_ps_disable(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100158 }
159
Johannes Berg5b714c62010-08-27 13:45:28 +0200160 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
Johannes Berg5b714c62010-08-27 13:45:28 +0200161 /*
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 */
Benoit Papillault93895752010-01-14 23:20:31 +0100171 netif_tx_wake_all_queues(sdata->dev);
Johannes Berg5b714c62010-08-27 13:45:28 +0200172 }
Benoit Papillault93895752010-01-14 23:20:31 +0100173
Johannes Berge76aadc2011-11-29 10:20:02 +0100174 if (sdata->vif.type == NL80211_IFTYPE_AP ||
175 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
176 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100177 ieee80211_bss_info_change_notify(
178 sdata, BSS_CHANGED_BEACON_ENABLED);
179 }
180 mutex_unlock(&local->iflist_mtx);
181}
Johannes Berg21f83582010-12-18 17:20:47 +0100182
Johannes Berg2eb278e2012-06-05 14:28:42 +0200183void 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 {
Johannes Berg71bbc992012-06-15 15:30:18 +0200194 cfg80211_ready_on_channel(&roc->sdata->wdev, (unsigned long)roc,
Johannes Berg2eb278e2012-06-05 14:28:42 +0200195 roc->chan, roc->chan_type,
196 roc->req_duration, GFP_KERNEL);
197 }
198
199 roc->notified = true;
200}
201
Johannes Berg21f83582010-12-18 17:20:47 +0100202static 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);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200206 struct ieee80211_roc_work *roc, *dep, *tmp;
Johannes Berg21f83582010-12-18 17:20:47 +0100207
208 mutex_lock(&local->mtx);
209
Johannes Berg2eb278e2012-06-05 14:28:42 +0200210 if (list_empty(&local->roc_list))
211 goto out_unlock;
Johannes Berg21f83582010-12-18 17:20:47 +0100212
Johannes Berg2eb278e2012-06-05 14:28:42 +0200213 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
214 list);
Johannes Berg90fc4b32010-12-18 17:20:48 +0100215
Johannes Berg2eb278e2012-06-05 14:28:42 +0200216 if (!roc->started)
217 goto out_unlock;
218
219 roc->hw_begun = true;
220 roc->hw_start_time = local->hw_roc_start_time;
221
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:
Johannes Berg21f83582010-12-18 17:20:47 +0100235 mutex_unlock(&local->mtx);
236}
237
238void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
239{
240 struct ieee80211_local *local = hw_to_local(hw);
241
Johannes Berg2eb278e2012-06-05 14:28:42 +0200242 local->hw_roc_start_time = jiffies;
243
Johannes Berg21f83582010-12-18 17:20:47 +0100244 trace_api_ready_on_channel(local);
245
246 ieee80211_queue_work(hw, &local->hw_roc_start);
247}
248EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
249
Johannes Berg2eb278e2012-06-05 14:28:42 +0200250void ieee80211_start_next_roc(struct ieee80211_local *local)
251{
252 struct ieee80211_roc_work *roc;
253
254 lockdep_assert_held(&local->mtx);
255
256 if (list_empty(&local->roc_list)) {
257 ieee80211_run_deferred_scan(local);
258 return;
259 }
260
261 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
262 list);
263
Johannes Berg0f6b3f52012-06-20 20:11:33 +0200264 if (WARN_ON_ONCE(roc->started))
265 return;
266
Johannes Berg2eb278e2012-06-05 14:28:42 +0200267 if (local->ops->remain_on_channel) {
268 int ret, duration = roc->duration;
269
270 /* XXX: duplicated, see ieee80211_start_roc_work() */
271 if (!duration)
272 duration = 10;
273
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
296void 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) {
Johannes Berg71bbc992012-06-15 15:30:18 +0200302 cfg80211_mgmt_tx_status(&roc->sdata->wdev,
Johannes Berg2eb278e2012-06-05 14:28:42 +0200303 (unsigned long)roc->frame,
304 roc->frame->data, roc->frame->len,
305 false, GFP_KERNEL);
306 kfree_skb(roc->frame);
307 }
308
309 if (!roc->mgmt_tx_cookie)
Johannes Berg71bbc992012-06-15 15:30:18 +0200310 cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
Johannes Berg2eb278e2012-06-05 14:28:42 +0200311 (unsigned long)roc,
312 roc->chan, roc->chan_type,
313 GFP_KERNEL);
314
315 list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
316 ieee80211_roc_notify_destroy(dep);
317
318 kfree(roc);
319}
320
321void 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;
327
328 mutex_lock(&local->mtx);
329
330 if (roc->abort)
331 goto finish;
332
333 if (WARN_ON(list_empty(&local->roc_list)))
334 goto out_unlock;
335
336 if (WARN_ON(roc != list_first_entry(&local->roc_list,
337 struct ieee80211_roc_work,
338 list)))
339 goto out_unlock;
340
341 if (!roc->started) {
342 struct ieee80211_roc_work *dep;
343
344 /* start this ROC */
345
346 /* switch channel etc */
347 ieee80211_recalc_idle(local);
348
349 local->tmp_channel = roc->chan;
350 local->tmp_channel_type = roc->chan_type;
351 ieee80211_hw_config(local, 0);
352
353 /* tell userspace or send frame */
354 ieee80211_handle_roc_started(roc);
355 list_for_each_entry(dep, &roc->dependents, list)
356 ieee80211_handle_roc_started(dep);
357
358 /* if it was pure TX, just finish right away */
359 if (!roc->duration)
360 goto finish;
361
362 roc->started = true;
363 ieee80211_queue_delayed_work(&local->hw, &roc->work,
364 msecs_to_jiffies(roc->duration));
365 } else {
366 /* finish this ROC */
367 finish:
368 list_del(&roc->list);
369 ieee80211_roc_notify_destroy(roc);
370
371 if (roc->started) {
372 drv_flush(local, false);
373
374 local->tmp_channel = NULL;
375 ieee80211_hw_config(local, 0);
376
377 ieee80211_offchannel_return(local, true);
378 }
379
380 ieee80211_recalc_idle(local);
381
Johannes Berg0f6b3f52012-06-20 20:11:33 +0200382 if (roc->started)
383 ieee80211_start_next_roc(local);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200384 }
385
386 out_unlock:
387 mutex_unlock(&local->mtx);
388}
389
Johannes Berg21f83582010-12-18 17:20:47 +0100390static void ieee80211_hw_roc_done(struct work_struct *work)
391{
392 struct ieee80211_local *local =
393 container_of(work, struct ieee80211_local, hw_roc_done);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200394 struct ieee80211_roc_work *roc;
Johannes Berg21f83582010-12-18 17:20:47 +0100395
396 mutex_lock(&local->mtx);
397
Johannes Berg2eb278e2012-06-05 14:28:42 +0200398 if (list_empty(&local->roc_list))
399 goto out_unlock;
Johannes Berg21f83582010-12-18 17:20:47 +0100400
Johannes Berg2eb278e2012-06-05 14:28:42 +0200401 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
402 list);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200403
Johannes Berg2eb278e2012-06-05 14:28:42 +0200404 if (!roc->started)
405 goto out_unlock;
Johannes Berg71ecfa12012-05-31 15:09:27 +0200406
Johannes Berg2eb278e2012-06-05 14:28:42 +0200407 list_del(&roc->list);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200408
Johannes Berg2eb278e2012-06-05 14:28:42 +0200409 ieee80211_roc_notify_destroy(roc);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200410
Johannes Berg2eb278e2012-06-05 14:28:42 +0200411 /* if there's another roc, start it now */
412 ieee80211_start_next_roc(local);
Johannes Berg21f83582010-12-18 17:20:47 +0100413
Johannes Berg2eb278e2012-06-05 14:28:42 +0200414 out_unlock:
Johannes Berg21f83582010-12-18 17:20:47 +0100415 mutex_unlock(&local->mtx);
416}
417
418void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
419{
420 struct ieee80211_local *local = hw_to_local(hw);
421
422 trace_api_remain_on_channel_expired(local);
423
424 ieee80211_queue_work(hw, &local->hw_roc_done);
425}
426EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
427
Johannes Berg2eb278e2012-06-05 14:28:42 +0200428void ieee80211_roc_setup(struct ieee80211_local *local)
Johannes Berg21f83582010-12-18 17:20:47 +0100429{
430 INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
431 INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200432 INIT_LIST_HEAD(&local->roc_list);
433}
434
435void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
436{
437 struct ieee80211_local *local = sdata->local;
438 struct ieee80211_roc_work *roc, *tmp;
439 LIST_HEAD(tmp_list);
440
441 mutex_lock(&local->mtx);
442 list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
443 if (roc->sdata != sdata)
444 continue;
445
446 if (roc->started && local->ops->remain_on_channel) {
447 /* can race, so ignore return value */
448 drv_cancel_remain_on_channel(local);
449 }
450
451 list_move_tail(&roc->list, &tmp_list);
452 roc->abort = true;
453 }
454
455 ieee80211_start_next_roc(local);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200456 mutex_unlock(&local->mtx);
457
458 list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
459 if (local->ops->remain_on_channel) {
460 list_del(&roc->list);
461 ieee80211_roc_notify_destroy(roc);
462 } else {
463 ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
464
465 /* work will clean up etc */
466 flush_delayed_work(&roc->work);
467 }
468 }
469
470 WARN_ON_ONCE(!list_empty(&tmp_list));
Johannes Berg21f83582010-12-18 17:20:47 +0100471}