2 * Off-channel operation helpers
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>
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.
15 #include <linux/export.h>
16 #include <net/mac80211.h>
17 #include "ieee80211_i.h"
18 #include "driver-ops.h"
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.
27 static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data
*sdata
)
29 struct ieee80211_local
*local
= sdata
->local
;
30 struct ieee80211_if_managed
*ifmgd
= &sdata
->u
.mgd
;
32 local
->offchannel_ps_enabled
= false;
34 /* FIXME: what to do when local->pspolling is true? */
36 del_timer_sync(&local
->dynamic_ps_timer
);
37 del_timer_sync(&ifmgd
->bcn_mon_timer
);
38 del_timer_sync(&ifmgd
->conn_mon_timer
);
40 cancel_work_sync(&local
->dynamic_ps_enable_work
);
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
);
48 if (!local
->offchannel_ps_enabled
||
49 !(local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
))
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
60 ieee80211_send_nullfunc(local
, sdata
, 1);
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
)
66 struct ieee80211_local
*local
= sdata
->local
;
69 ieee80211_send_nullfunc(local
, sdata
, 0);
70 else if (local
->offchannel_ps_enabled
) {
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.
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
84 /* TODO: Only set hardware if CONF_PS changed?
85 * TODO: Should we set offchannel_ps_enabled to false?
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) {
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.
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
));
101 ieee80211_sta_reset_beacon_monitor(sdata
);
102 ieee80211_sta_reset_conn_monitor(sdata
);
105 void ieee80211_offchannel_stop_vifs(struct ieee80211_local
*local
,
106 bool offchannel_ps_enable
)
108 struct ieee80211_sub_if_data
*sdata
;
110 if (WARN_ON(local
->use_chanctx
))
114 * notify the AP about us leaving the channel and stop all
117 mutex_lock(&local
->iflist_mtx
);
118 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
119 if (!ieee80211_sdata_running(sdata
))
122 if (sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
)
125 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
126 set_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
);
128 /* Check to see if we should disable beaconing. */
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
);
135 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
) {
136 netif_tx_stop_all_queues(sdata
->dev
);
137 if (offchannel_ps_enable
&&
138 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) &&
139 sdata
->u
.mgd
.associated
)
140 ieee80211_offchannel_ps_enable(sdata
);
143 mutex_unlock(&local
->iflist_mtx
);
146 void ieee80211_offchannel_return(struct ieee80211_local
*local
,
147 bool offchannel_ps_disable
)
149 struct ieee80211_sub_if_data
*sdata
;
151 if (WARN_ON(local
->use_chanctx
))
154 mutex_lock(&local
->iflist_mtx
);
155 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
156 if (sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
)
159 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
160 clear_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
);
162 if (!ieee80211_sdata_running(sdata
))
165 /* Tell AP we're back */
166 if (offchannel_ps_disable
&&
167 sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
168 if (sdata
->u
.mgd
.associated
)
169 ieee80211_offchannel_ps_disable(sdata
);
172 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
) {
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.
183 netif_tx_wake_all_queues(sdata
->dev
);
186 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
187 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
188 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
189 ieee80211_bss_info_change_notify(
190 sdata
, BSS_CHANGED_BEACON_ENABLED
);
192 mutex_unlock(&local
->iflist_mtx
);
195 void ieee80211_handle_roc_started(struct ieee80211_roc_work
*roc
)
200 if (roc
->mgmt_tx_cookie
) {
201 if (!WARN_ON(!roc
->frame
)) {
202 ieee80211_tx_skb_tid_band(roc
->sdata
, roc
->frame
, 7,
207 cfg80211_ready_on_channel(&roc
->sdata
->wdev
, roc
->cookie
,
208 roc
->chan
, roc
->req_duration
,
212 roc
->notified
= true;
215 static void ieee80211_hw_roc_start(struct work_struct
*work
)
217 struct ieee80211_local
*local
=
218 container_of(work
, struct ieee80211_local
, hw_roc_start
);
219 struct ieee80211_roc_work
*roc
, *dep
, *tmp
;
221 mutex_lock(&local
->mtx
);
223 if (list_empty(&local
->roc_list
))
226 roc
= list_first_entry(&local
->roc_list
, struct ieee80211_roc_work
,
232 roc
->hw_begun
= true;
233 roc
->hw_start_time
= local
->hw_roc_start_time
;
235 ieee80211_handle_roc_started(roc
);
236 list_for_each_entry_safe(dep
, tmp
, &roc
->dependents
, list
) {
237 ieee80211_handle_roc_started(dep
);
239 if (dep
->duration
> roc
->duration
) {
240 u32 dur
= dep
->duration
;
241 dep
->duration
= dur
- roc
->duration
;
243 list_move(&dep
->list
, &roc
->list
);
247 mutex_unlock(&local
->mtx
);
250 void ieee80211_ready_on_channel(struct ieee80211_hw
*hw
)
252 struct ieee80211_local
*local
= hw_to_local(hw
);
254 local
->hw_roc_start_time
= jiffies
;
256 trace_api_ready_on_channel(local
);
258 ieee80211_queue_work(hw
, &local
->hw_roc_start
);
260 EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel
);
262 void ieee80211_start_next_roc(struct ieee80211_local
*local
)
264 struct ieee80211_roc_work
*roc
;
266 lockdep_assert_held(&local
->mtx
);
268 if (list_empty(&local
->roc_list
)) {
269 ieee80211_run_deferred_scan(local
);
273 roc
= list_first_entry(&local
->roc_list
, struct ieee80211_roc_work
,
276 if (WARN_ON_ONCE(roc
->started
))
279 if (local
->ops
->remain_on_channel
) {
280 int ret
, duration
= roc
->duration
;
282 /* XXX: duplicated, see ieee80211_start_roc_work() */
286 ret
= drv_remain_on_channel(local
, roc
->sdata
, roc
->chan
,
292 wiphy_warn(local
->hw
.wiphy
,
293 "failed to start next HW ROC (%d)\n", ret
);
295 * queue the work struct again to avoid recursion
296 * when multiple failures occur
298 ieee80211_remain_on_channel_expired(&local
->hw
);
302 ieee80211_queue_delayed_work(&local
->hw
, &roc
->work
,
303 round_jiffies_relative(HZ
/2));
307 void ieee80211_roc_notify_destroy(struct ieee80211_roc_work
*roc
)
309 struct ieee80211_roc_work
*dep
, *tmp
;
311 /* was never transmitted */
313 cfg80211_mgmt_tx_status(&roc
->sdata
->wdev
,
314 (unsigned long)roc
->frame
,
315 roc
->frame
->data
, roc
->frame
->len
,
317 kfree_skb(roc
->frame
);
320 if (!roc
->mgmt_tx_cookie
)
321 cfg80211_remain_on_channel_expired(&roc
->sdata
->wdev
,
322 roc
->cookie
, roc
->chan
,
325 list_for_each_entry_safe(dep
, tmp
, &roc
->dependents
, list
)
326 ieee80211_roc_notify_destroy(dep
);
331 void ieee80211_sw_roc_work(struct work_struct
*work
)
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
;
339 mutex_lock(&local
->mtx
);
344 if (WARN_ON(list_empty(&local
->roc_list
)))
347 if (WARN_ON(roc
!= list_first_entry(&local
->roc_list
,
348 struct ieee80211_roc_work
,
353 struct ieee80211_roc_work
*dep
;
357 /* switch channel etc */
358 ieee80211_recalc_idle(local
);
360 local
->tmp_channel
= roc
->chan
;
361 ieee80211_hw_config(local
, 0);
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
);
368 /* if it was pure TX, just finish right away */
373 ieee80211_queue_delayed_work(&local
->hw
, &roc
->work
,
374 msecs_to_jiffies(roc
->duration
));
376 /* finish this ROC */
378 list_del(&roc
->list
);
379 started
= roc
->started
;
380 ieee80211_roc_notify_destroy(roc
);
383 drv_flush(local
, false);
385 local
->tmp_channel
= NULL
;
386 ieee80211_hw_config(local
, 0);
388 ieee80211_offchannel_return(local
, true);
391 ieee80211_recalc_idle(local
);
394 ieee80211_start_next_roc(local
);
398 mutex_unlock(&local
->mtx
);
401 static void ieee80211_hw_roc_done(struct work_struct
*work
)
403 struct ieee80211_local
*local
=
404 container_of(work
, struct ieee80211_local
, hw_roc_done
);
405 struct ieee80211_roc_work
*roc
;
407 mutex_lock(&local
->mtx
);
409 if (list_empty(&local
->roc_list
))
412 roc
= list_first_entry(&local
->roc_list
, struct ieee80211_roc_work
,
418 list_del(&roc
->list
);
420 ieee80211_roc_notify_destroy(roc
);
422 /* if there's another roc, start it now */
423 ieee80211_start_next_roc(local
);
426 mutex_unlock(&local
->mtx
);
429 void ieee80211_remain_on_channel_expired(struct ieee80211_hw
*hw
)
431 struct ieee80211_local
*local
= hw_to_local(hw
);
433 trace_api_remain_on_channel_expired(local
);
435 ieee80211_queue_work(hw
, &local
->hw_roc_done
);
437 EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired
);
439 void ieee80211_roc_setup(struct ieee80211_local
*local
)
441 INIT_WORK(&local
->hw_roc_start
, ieee80211_hw_roc_start
);
442 INIT_WORK(&local
->hw_roc_done
, ieee80211_hw_roc_done
);
443 INIT_LIST_HEAD(&local
->roc_list
);
446 void ieee80211_roc_purge(struct ieee80211_sub_if_data
*sdata
)
448 struct ieee80211_local
*local
= sdata
->local
;
449 struct ieee80211_roc_work
*roc
, *tmp
;
452 mutex_lock(&local
->mtx
);
453 list_for_each_entry_safe(roc
, tmp
, &local
->roc_list
, list
) {
454 if (roc
->sdata
!= sdata
)
457 if (roc
->started
&& local
->ops
->remain_on_channel
) {
458 /* can race, so ignore return value */
459 drv_cancel_remain_on_channel(local
);
462 list_move_tail(&roc
->list
, &tmp_list
);
465 mutex_unlock(&local
->mtx
);
467 list_for_each_entry_safe(roc
, tmp
, &tmp_list
, list
) {
468 if (local
->ops
->remain_on_channel
) {
469 list_del(&roc
->list
);
470 ieee80211_roc_notify_destroy(roc
);
472 ieee80211_queue_delayed_work(&local
->hw
, &roc
->work
, 0);
474 /* work will clean up etc */
475 flush_delayed_work(&roc
->work
);
479 WARN_ON_ONCE(!list_empty(&tmp_list
));