[deliverable/linux.git] / net / mac80211 / offchannel.c

/*
 * Off-channel operation helpers
 *
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-trace.h"
#include "driver-ops.h"

/*
 * Tell our hardware to disable PS.
 * Optionally inform AP that we will go to sleep so that it will buffer
 * the frames while we are doing off-channel work.  This is optional
 * because we *may* be doing work on-operating channel, and want our
 * hardware unconditionally awake, but still let the AP send us normal frames.
 */
static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata,
					   bool tell_ap)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	local->offchannel_ps_enabled = false;

	/* FIXME: what to do when local->pspolling is true? */

	del_timer_sync(&local->dynamic_ps_timer);
	del_timer_sync(&ifmgd->bcn_mon_timer);
	del_timer_sync(&ifmgd->conn_mon_timer);

	cancel_work_sync(&local->dynamic_ps_enable_work);

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->offchannel_ps_enabled = true;
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}

	if (tell_ap && (!local->offchannel_ps_enabled ||
			!(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)))
		/*
		 * If power save was enabled, no need to send a nullfunc
		 * frame because AP knows that we are sleeping. But if the
		 * hardware is creating the nullfunc frame for power save
		 * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
		 * enabled) and power save was enabled, the firmware just
		 * sent a null frame with power save disabled. So we need
		 * to send a new nullfunc frame to inform the AP that we
		 * are again sleeping.
		 */
		ieee80211_send_nullfunc(local, sdata, 1);
}

/* inform AP that we are awake again, unless power save is enabled */
static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;

	if (!local->ps_sdata)
		ieee80211_send_nullfunc(local, sdata, 0);
	else if (local->offchannel_ps_enabled) {
		/*
		 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
		 * will send a nullfunc frame with the powersave bit set
		 * even though the AP already knows that we are sleeping.
		 * This could be avoided by sending a null frame with power
		 * save bit disabled before enabling the power save, but
		 * this doesn't gain anything.
		 *
		 * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
		 * to send a nullfunc frame because AP already knows that
		 * we are sleeping, let's just enable power save mode in
		 * hardware.
		 */
		/* TODO:  Only set hardware if CONF_PS changed?
		 * TODO:  Should we set offchannel_ps_enabled to false?
		 */
		local->hw.conf.flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	} else if (local->hw.conf.dynamic_ps_timeout > 0) {
		/*
		 * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
		 * had been running before leaving the operating channel,
		 * restart the timer now and send a nullfunc frame to inform
		 * the AP that we are awake.
		 */
		ieee80211_send_nullfunc(local, sdata, 0);
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
	}

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);
}

void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
				    bool offchannel_ps_enable)
{
	struct ieee80211_sub_if_data *sdata;

	/*
	 * notify the AP about us leaving the channel and stop all
	 * STA interfaces.
	 */
	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;

		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
			set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);

		/* Check to see if we should disable beaconing. */
		if (sdata->vif.type == NL80211_IFTYPE_AP ||
		    sdata->vif.type == NL80211_IFTYPE_ADHOC ||
		    sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
			ieee80211_bss_info_change_notify(
				sdata, BSS_CHANGED_BEACON_ENABLED);

		if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
			netif_tx_stop_all_queues(sdata->dev);
			if (offchannel_ps_enable &&
			    (sdata->vif.type == NL80211_IFTYPE_STATION) &&
			    sdata->u.mgd.associated)
				ieee80211_offchannel_ps_enable(sdata, true);
		}
	}
	mutex_unlock(&local->iflist_mtx);
}

void ieee80211_offchannel_return(struct ieee80211_local *local,
				 bool offchannel_ps_disable)
{
	struct ieee80211_sub_if_data *sdata;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
			clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);

		if (!ieee80211_sdata_running(sdata))
			continue;

		/* Tell AP we're back */
		if (offchannel_ps_disable &&
		    sdata->vif.type == NL80211_IFTYPE_STATION) {
			if (sdata->u.mgd.associated)
				ieee80211_offchannel_ps_disable(sdata);
		}

		if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
			/*
			 * This may wake up queues even though the driver
			 * currently has them stopped. This is not very
			 * likely, since the driver won't have gotten any
			 * (or hardly any) new packets while we weren't
			 * on the right channel, and even if it happens
			 * it will at most lead to queueing up one more
			 * packet per queue in mac80211 rather than on
			 * the interface qdisc.
			 */
			netif_tx_wake_all_queues(sdata->dev);
		}

		if (sdata->vif.type == NL80211_IFTYPE_AP ||
		    sdata->vif.type == NL80211_IFTYPE_ADHOC ||
		    sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
			ieee80211_bss_info_change_notify(
				sdata, BSS_CHANGED_BEACON_ENABLED);
	}
	mutex_unlock(&local->iflist_mtx);
}

void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc)
{
	if (roc->notified)
		return;

	if (roc->mgmt_tx_cookie) {
		if (!WARN_ON(!roc->frame)) {
			ieee80211_tx_skb(roc->sdata, roc->frame);
			roc->frame = NULL;
		}
	} else {
		cfg80211_ready_on_channel(roc->sdata->dev, (unsigned long)roc,
					  roc->chan, roc->chan_type,
					  roc->req_duration, GFP_KERNEL);
	}

	roc->notified = true;
}

static void ieee80211_hw_roc_start(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, hw_roc_start);
	struct ieee80211_roc_work *roc, *dep, *tmp;

	mutex_lock(&local->mtx);

	if (list_empty(&local->roc_list))
		goto out_unlock;

	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
			       list);

	if (!roc->started)
		goto out_unlock;

	roc->hw_begun = true;
	roc->hw_start_time = local->hw_roc_start_time;

	ieee80211_handle_roc_started(roc);
	list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
		ieee80211_handle_roc_started(dep);

		if (dep->duration > roc->duration) {
			u32 dur = dep->duration;
			dep->duration = dur - roc->duration;
			roc->duration = dur;
			list_del(&dep->list);
			list_add(&dep->list, &roc->list);
		}
	}
 out_unlock:
	mutex_unlock(&local->mtx);
}

void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	local->hw_roc_start_time = jiffies;

	trace_api_ready_on_channel(local);

	ieee80211_queue_work(hw, &local->hw_roc_start);
}
EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);

void ieee80211_start_next_roc(struct ieee80211_local *local)
{
	struct ieee80211_roc_work *roc;

	lockdep_assert_held(&local->mtx);

	if (list_empty(&local->roc_list)) {
		ieee80211_run_deferred_scan(local);
		return;
	}

	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
			       list);

	if (local->ops->remain_on_channel) {
		int ret, duration = roc->duration;

		/* XXX: duplicated, see ieee80211_start_roc_work() */
		if (!duration)
			duration = 10;

		ret = drv_remain_on_channel(local, roc->chan,
					    roc->chan_type,
					    duration);

		roc->started = true;

		if (ret) {
			wiphy_warn(local->hw.wiphy,
				   "failed to start next HW ROC (%d)\n", ret);
			/*
			 * queue the work struct again to avoid recursion
			 * when multiple failures occur
			 */
			ieee80211_remain_on_channel_expired(&local->hw);
		}
	} else {
		/* delay it a bit */
		ieee80211_queue_delayed_work(&local->hw, &roc->work,
					     round_jiffies_relative(HZ/2));
	}
}

void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
{
	struct ieee80211_roc_work *dep, *tmp;

	/* was never transmitted */
	if (roc->frame) {
		cfg80211_mgmt_tx_status(roc->sdata->dev,
					(unsigned long)roc->frame,
					roc->frame->data, roc->frame->len,
					false, GFP_KERNEL);
		kfree_skb(roc->frame);
	}

	if (!roc->mgmt_tx_cookie)
		cfg80211_remain_on_channel_expired(roc->sdata->dev,
						   (unsigned long)roc,
						   roc->chan, roc->chan_type,
						   GFP_KERNEL);

	list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
		ieee80211_roc_notify_destroy(dep);

	kfree(roc);
}

void ieee80211_sw_roc_work(struct work_struct *work)
{
	struct ieee80211_roc_work *roc =
		container_of(work, struct ieee80211_roc_work, work.work);
	struct ieee80211_sub_if_data *sdata = roc->sdata;
	struct ieee80211_local *local = sdata->local;

	mutex_lock(&local->mtx);

	if (roc->abort)
		goto finish;

	if (WARN_ON(list_empty(&local->roc_list)))
		goto out_unlock;

	if (WARN_ON(roc != list_first_entry(&local->roc_list,
					    struct ieee80211_roc_work,
					    list)))
		goto out_unlock;

	if (!roc->started) {
		struct ieee80211_roc_work *dep;

		/* start this ROC */

		/* switch channel etc */
		ieee80211_recalc_idle(local);

		local->tmp_channel = roc->chan;
		local->tmp_channel_type = roc->chan_type;
		ieee80211_hw_config(local, 0);

		/* tell userspace or send frame */
		ieee80211_handle_roc_started(roc);
		list_for_each_entry(dep, &roc->dependents, list)
			ieee80211_handle_roc_started(dep);

		/* if it was pure TX, just finish right away */
		if (!roc->duration)
			goto finish;

		roc->started = true;
		ieee80211_queue_delayed_work(&local->hw, &roc->work,
					     msecs_to_jiffies(roc->duration));
	} else {
		/* finish this ROC */
 finish:
		list_del(&roc->list);
		ieee80211_roc_notify_destroy(roc);

		if (roc->started) {
			drv_flush(local, false);

			local->tmp_channel = NULL;
			ieee80211_hw_config(local, 0);

			ieee80211_offchannel_return(local, true);
		}

		ieee80211_recalc_idle(local);

		ieee80211_start_next_roc(local);
	}

 out_unlock:
	mutex_unlock(&local->mtx);
}

static void ieee80211_hw_roc_done(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, hw_roc_done);
	struct ieee80211_roc_work *roc;

	mutex_lock(&local->mtx);

	if (list_empty(&local->roc_list))
		goto out_unlock;

	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
			       list);

	if (!roc->started)
		goto out_unlock;

	list_del(&roc->list);

	ieee80211_roc_notify_destroy(roc);

	/* if there's another roc, start it now */
	ieee80211_start_next_roc(local);

 out_unlock:
	mutex_unlock(&local->mtx);
}

void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	trace_api_remain_on_channel_expired(local);

	ieee80211_queue_work(hw, &local->hw_roc_done);
}
EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);

void ieee80211_roc_setup(struct ieee80211_local *local)
{
	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
	INIT_LIST_HEAD(&local->roc_list);
}

void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_roc_work *roc, *tmp;
	LIST_HEAD(tmp_list);

	mutex_lock(&local->mtx);
	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
		if (roc->sdata != sdata)
			continue;

		if (roc->started && local->ops->remain_on_channel) {
			/* can race, so ignore return value */
			drv_cancel_remain_on_channel(local);
		}

		list_move_tail(&roc->list, &tmp_list);
		roc->abort = true;
	}

	ieee80211_start_next_roc(local);
	mutex_unlock(&local->mtx);

	list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
		if (local->ops->remain_on_channel) {
			list_del(&roc->list);
			ieee80211_roc_notify_destroy(roc);
		} else {
			ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);

			/* work will clean up etc */
			flush_delayed_work(&roc->work);
		}
	}

	WARN_ON_ONCE(!list_empty(&tmp_list));
}
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>
b203ffc3 JM	17	#include "ieee80211_i.h"
21f83589	18	#include "driver-trace.h"
2eb278e0	19	#include "driver-ops.h"
b203ffc3 JM	20
b203ffc3 JM	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	*/
b23b025f BG	28	static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata,
b23b025f BG	29	bool tell_ap)
b203ffc3 JM	30	{
b203ffc3 JM	31	struct ieee80211_local *local = sdata->local;
4730d597	32	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
b203ffc3 JM	33
	34	local->offchannel_ps_enabled = false;
	35
	36	/* FIXME: what to do when local->pspolling is true? */
	37
	38	del_timer_sync(&local->dynamic_ps_timer);
3bc3c0d7	39	del_timer_sync(&ifmgd->bcn_mon_timer);
4730d597 LR	40	del_timer_sync(&ifmgd->conn_mon_timer);
4730d597 LR	41
b203ffc3 JM	42	cancel_work_sync(&local->dynamic_ps_enable_work);
	43
	44	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
	45	local->offchannel_ps_enabled = true;
	46	local->hw.conf.flags &= ~IEEE80211_CONF_PS;
	47	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	48	}
	49
b23b025f BG	50	if (tell_ap && (!local->offchannel_ps_enabled \|\|
b23b025f BG	51	!(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)))
b203ffc3 JM	52	/*
	53	* If power save was enabled, no need to send a nullfunc
	54	* frame because AP knows that we are sleeping. But if the
	55	* hardware is creating the nullfunc frame for power save
	56	* status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
	57	* enabled) and power save was enabled, the firmware just
	58	* sent a null frame with power save disabled. So we need
	59	* to send a new nullfunc frame to inform the AP that we
	60	* are again sleeping.
	61	*/
	62	ieee80211_send_nullfunc(local, sdata, 1);
	63	}
	64
	65	/* inform AP that we are awake again, unless power save is enabled */
	66	static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
	67	{
	68	struct ieee80211_local *local = sdata->local;
	69
	70	if (!local->ps_sdata)
	71	ieee80211_send_nullfunc(local, sdata, 0);
	72	else if (local->offchannel_ps_enabled) {
	73	/*
	74	* In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
	75	* will send a nullfunc frame with the powersave bit set
	76	* even though the AP already knows that we are sleeping.
	77	* This could be avoided by sending a null frame with power
	78	* save bit disabled before enabling the power save, but
	79	* this doesn't gain anything.
	80	*
	81	* When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
	82	* to send a nullfunc frame because AP already knows that
	83	* we are sleeping, let's just enable power save mode in
	84	* hardware.
	85	*/
b23b025f BG	86	/* TODO: Only set hardware if CONF_PS changed?
	87	* TODO: Should we set offchannel_ps_enabled to false?
	88	*/
b203ffc3 JM	89	local->hw.conf.flags \|= IEEE80211_CONF_PS;
	90	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	91	} else if (local->hw.conf.dynamic_ps_timeout > 0) {
	92	/*
	93	* If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
	94	* had been running before leaving the operating channel,
	95	* restart the timer now and send a nullfunc frame to inform
	96	* the AP that we are awake.
	97	*/
	98	ieee80211_send_nullfunc(local, sdata, 0);
	99	mod_timer(&local->dynamic_ps_timer, jiffies +
	100	msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
	101	}
4730d597	102
3bc3c0d7	103	ieee80211_sta_reset_beacon_monitor(sdata);
4730d597	104	ieee80211_sta_reset_conn_monitor(sdata);
b203ffc3 JM	105	}
b203ffc3 JM	106
b23b025f BG	107	void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
b23b025f BG	108	bool offchannel_ps_enable)
b203ffc3 JM	109	{
	110	struct ieee80211_sub_if_data *sdata;
	111
b23b025f BG	112	/*
	113	* notify the AP about us leaving the channel and stop all
	114	* STA interfaces.
	115	*/
b203ffc3 JM	116	mutex_lock(&local->iflist_mtx);
	117	list_for_each_entry(sdata, &local->interfaces, list) {
	118	if (!ieee80211_sdata_running(sdata))
	119	continue;
	120
b23b025f BG	121	if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
	122	set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
	123
	124	/* Check to see if we should disable beaconing. */
b203ffc3 JM	125	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
	126	sdata->vif.type == NL80211_IFTYPE_ADHOC \|\|
	127	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
	128	ieee80211_bss_info_change_notify(
	129	sdata, BSS_CHANGED_BEACON_ENABLED);
	130
b23b025f	131	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
cfa6cb20	132	netif_tx_stop_all_queues(sdata->dev);
b23b025f BG	133	if (offchannel_ps_enable &&
	134	(sdata->vif.type == NL80211_IFTYPE_STATION) &&
	135	sdata->u.mgd.associated)
	136	ieee80211_offchannel_ps_enable(sdata, true);
5b714c6a	137	}
b203ffc3 JM	138	}
	139	mutex_unlock(&local->iflist_mtx);
	140	}
	141
b203ffc3	142	void ieee80211_offchannel_return(struct ieee80211_local *local,
b23b025f	143	bool offchannel_ps_disable)
b203ffc3 JM	144	{
	145	struct ieee80211_sub_if_data *sdata;
	146
	147	mutex_lock(&local->iflist_mtx);
	148	list_for_each_entry(sdata, &local->interfaces, list) {
f6e8cb72 EP	149	if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
	150	clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
	151
b203ffc3 JM	152	if (!ieee80211_sdata_running(sdata))
	153	continue;
	154
	155	/* Tell AP we're back */
b23b025f BG	156	if (offchannel_ps_disable &&
b23b025f BG	157	sdata->vif.type == NL80211_IFTYPE_STATION) {
b203ffc3 JM	158	if (sdata->u.mgd.associated)
b203ffc3 JM	159	ieee80211_offchannel_ps_disable(sdata);
b203ffc3 JM	160	}
b203ffc3 JM	161
5b714c6a	162	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
5b714c6a JB	163	/*
	164	* This may wake up queues even though the driver
	165	* currently has them stopped. This is not very
	166	* likely, since the driver won't have gotten any
	167	* (or hardly any) new packets while we weren't
	168	* on the right channel, and even if it happens
	169	* it will at most lead to queueing up one more
	170	* packet per queue in mac80211 rather than on
	171	* the interface qdisc.
	172	*/
93895757	173	netif_tx_wake_all_queues(sdata->dev);
5b714c6a	174	}
93895757	175
e76aadc5 JB	176	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
	177	sdata->vif.type == NL80211_IFTYPE_ADHOC \|\|
	178	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
b203ffc3 JM	179	ieee80211_bss_info_change_notify(
	180	sdata, BSS_CHANGED_BEACON_ENABLED);
	181	}
	182	mutex_unlock(&local->iflist_mtx);
	183	}
21f83589	184
2eb278e0 JB	185	void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc)
	186	{
	187	if (roc->notified)
	188	return;
	189
	190	if (roc->mgmt_tx_cookie) {
	191	if (!WARN_ON(!roc->frame)) {
	192	ieee80211_tx_skb(roc->sdata, roc->frame);
	193	roc->frame = NULL;
	194	}
	195	} else {
	196	cfg80211_ready_on_channel(roc->sdata->dev, (unsigned long)roc,
	197	roc->chan, roc->chan_type,
	198	roc->req_duration, GFP_KERNEL);
	199	}
	200
	201	roc->notified = true;
	202	}
	203
21f83589 JB	204	static void ieee80211_hw_roc_start(struct work_struct *work)
	205	{
	206	struct ieee80211_local *local =
	207	container_of(work, struct ieee80211_local, hw_roc_start);
2eb278e0	208	struct ieee80211_roc_work roc, dep, *tmp;
21f83589 JB	209
	210	mutex_lock(&local->mtx);
	211
2eb278e0 JB	212	if (list_empty(&local->roc_list))
2eb278e0 JB	213	goto out_unlock;
21f83589	214
2eb278e0 JB	215	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	216	list);
	217
	218	if (!roc->started)
	219	goto out_unlock;
	220
	221	roc->hw_begun = true;
	222	roc->hw_start_time = local->hw_roc_start_time;
90fc4b3a	223
2eb278e0 JB	224	ieee80211_handle_roc_started(roc);
	225	list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
	226	ieee80211_handle_roc_started(dep);
	227
	228	if (dep->duration > roc->duration) {
	229	u32 dur = dep->duration;
	230	dep->duration = dur - roc->duration;
	231	roc->duration = dur;
	232	list_del(&dep->list);
	233	list_add(&dep->list, &roc->list);
	234	}
	235	}
	236	out_unlock:
21f83589 JB	237	mutex_unlock(&local->mtx);
	238	}
	239
	240	void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
	241	{
	242	struct ieee80211_local *local = hw_to_local(hw);
	243
2eb278e0 JB	244	local->hw_roc_start_time = jiffies;
2eb278e0 JB	245
21f83589 JB	246	trace_api_ready_on_channel(local);
	247
	248	ieee80211_queue_work(hw, &local->hw_roc_start);
	249	}
	250	EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
	251
2eb278e0	252	void ieee80211_start_next_roc(struct ieee80211_local *local)
21f83589	253	{
2eb278e0	254	struct ieee80211_roc_work *roc;
21f83589	255
2eb278e0	256	lockdep_assert_held(&local->mtx);
21f83589	257
2eb278e0 JB	258	if (list_empty(&local->roc_list)) {
2eb278e0 JB	259	ieee80211_run_deferred_scan(local);
21f83589 JB	260	return;
	261	}
	262
2eb278e0 JB	263	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
2eb278e0 JB	264	list);
71ecfa18	265
2eb278e0 JB	266	if (local->ops->remain_on_channel) {
2eb278e0 JB	267	int ret, duration = roc->duration;
71ecfa18	268
2eb278e0 JB	269	/* XXX: duplicated, see ieee80211_start_roc_work() */
	270	if (!duration)
	271	duration = 10;
71ecfa18	272
2eb278e0 JB	273	ret = drv_remain_on_channel(local, roc->chan,
	274	roc->chan_type,
	275	duration);
	276
	277	roc->started = true;
	278
	279	if (ret) {
	280	wiphy_warn(local->hw.wiphy,
	281	"failed to start next HW ROC (%d)\n", ret);
	282	/*
	283	* queue the work struct again to avoid recursion
	284	* when multiple failures occur
	285	*/
	286	ieee80211_remain_on_channel_expired(&local->hw);
	287	}
	288	} else {
	289	/* delay it a bit */
	290	ieee80211_queue_delayed_work(&local->hw, &roc->work,
	291	round_jiffies_relative(HZ/2));
	292	}
	293	}
	294
	295	void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
	296	{
	297	struct ieee80211_roc_work dep, tmp;
	298
	299	/* was never transmitted */
	300	if (roc->frame) {
	301	cfg80211_mgmt_tx_status(roc->sdata->dev,
	302	(unsigned long)roc->frame,
	303	roc->frame->data, roc->frame->len,
	304	false, GFP_KERNEL);
	305	kfree_skb(roc->frame);
71ecfa18 JB	306	}
71ecfa18 JB	307
2eb278e0 JB	308	if (!roc->mgmt_tx_cookie)
	309	cfg80211_remain_on_channel_expired(roc->sdata->dev,
	310	(unsigned long)roc,
	311	roc->chan, roc->chan_type,
90fc4b3a	312	GFP_KERNEL);
21f83589	313
2eb278e0 JB	314	list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
	315	ieee80211_roc_notify_destroy(dep);
	316
	317	kfree(roc);
	318	}
	319
	320	void ieee80211_sw_roc_work(struct work_struct *work)
	321	{
	322	struct ieee80211_roc_work *roc =
	323	container_of(work, struct ieee80211_roc_work, work.work);
	324	struct ieee80211_sub_if_data *sdata = roc->sdata;
	325	struct ieee80211_local *local = sdata->local;
	326
	327	mutex_lock(&local->mtx);
	328
	329	if (roc->abort)
	330	goto finish;
	331
	332	if (WARN_ON(list_empty(&local->roc_list)))
	333	goto out_unlock;
	334
	335	if (WARN_ON(roc != list_first_entry(&local->roc_list,
	336	struct ieee80211_roc_work,
	337	list)))
	338	goto out_unlock;
	339
	340	if (!roc->started) {
	341	struct ieee80211_roc_work *dep;
	342
	343	/* start this ROC */
21f83589	344
2eb278e0 JB	345	/* switch channel etc */
	346	ieee80211_recalc_idle(local);
	347
	348	local->tmp_channel = roc->chan;
	349	local->tmp_channel_type = roc->chan_type;
	350	ieee80211_hw_config(local, 0);
	351
	352	/* tell userspace or send frame */
	353	ieee80211_handle_roc_started(roc);
	354	list_for_each_entry(dep, &roc->dependents, list)
	355	ieee80211_handle_roc_started(dep);
	356
	357	/* if it was pure TX, just finish right away */
	358	if (!roc->duration)
	359	goto finish;
	360
	361	roc->started = true;
	362	ieee80211_queue_delayed_work(&local->hw, &roc->work,
	363	msecs_to_jiffies(roc->duration));
	364	} else {
	365	/* finish this ROC */
	366	finish:
	367	list_del(&roc->list);
	368	ieee80211_roc_notify_destroy(roc);
	369
	370	if (roc->started) {
	371	drv_flush(local, false);
	372
	373	local->tmp_channel = NULL;
	374	ieee80211_hw_config(local, 0);
	375
	376	ieee80211_offchannel_return(local, true);
	377	}
	378
	379	ieee80211_recalc_idle(local);
	380
	381	ieee80211_start_next_roc(local);
2eb278e0 JB	382	}
	383
	384	out_unlock:
	385	mutex_unlock(&local->mtx);
	386	}
	387
	388	static void ieee80211_hw_roc_done(struct work_struct *work)
	389	{
	390	struct ieee80211_local *local =
	391	container_of(work, struct ieee80211_local, hw_roc_done);
	392	struct ieee80211_roc_work *roc;
	393
	394	mutex_lock(&local->mtx);
	395
	396	if (list_empty(&local->roc_list))
	397	goto out_unlock;
	398
	399	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	400	list);
	401
	402	if (!roc->started)
	403	goto out_unlock;
	404
	405	list_del(&roc->list);
	406
	407	ieee80211_roc_notify_destroy(roc);
	408
	409	/* if there's another roc, start it now */
	410	ieee80211_start_next_roc(local);
	411
2eb278e0	412	out_unlock:
21f83589 JB	413	mutex_unlock(&local->mtx);
	414	}
	415
	416	void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
	417	{
	418	struct ieee80211_local *local = hw_to_local(hw);
	419
	420	trace_api_remain_on_channel_expired(local);
	421
	422	ieee80211_queue_work(hw, &local->hw_roc_done);
	423	}
	424	EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
	425
2eb278e0	426	void ieee80211_roc_setup(struct ieee80211_local *local)
21f83589 JB	427	{
	428	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
	429	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
2eb278e0 JB	430	INIT_LIST_HEAD(&local->roc_list);
	431	}
	432
	433	void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
	434	{
	435	struct ieee80211_local *local = sdata->local;
	436	struct ieee80211_roc_work roc, tmp;
	437	LIST_HEAD(tmp_list);
	438
	439	mutex_lock(&local->mtx);
	440	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
	441	if (roc->sdata != sdata)
	442	continue;
	443
	444	if (roc->started && local->ops->remain_on_channel) {
	445	/* can race, so ignore return value */
	446	drv_cancel_remain_on_channel(local);
	447	}
	448
	449	list_move_tail(&roc->list, &tmp_list);
	450	roc->abort = true;
	451	}
	452
	453	ieee80211_start_next_roc(local);
2eb278e0 JB	454	mutex_unlock(&local->mtx);
	455
	456	list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
	457	if (local->ops->remain_on_channel) {
	458	list_del(&roc->list);
	459	ieee80211_roc_notify_destroy(roc);
	460	} else {
	461	ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
	462
	463	/* work will clean up etc */
	464	flush_delayed_work(&roc->work);
	465	}
	466	}
	467
	468	WARN_ON_ONCE(!list_empty(&tmp_list));
21f83589	469	}