[mirror_ubuntu-artful-kernel.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-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)
{
	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 (!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);
		}
	}
	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 (WARN_ON_ONCE(roc->started))
		return;

	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);

		if (roc->started)
			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"
2eb278e0	18	#include "driver-ops.h"
b203ffc3 JM	19
b203ffc3 JM	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	{
b203ffc3 JM	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);
4730d597 LR	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 \|\|
559cef99 RM	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	}
b203ffc3 JM	104
b23b025f BG	105	void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
b23b025f BG	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 &&
b23b025f BG	155	sdata->vif.type == NL80211_IFTYPE_STATION) {
b203ffc3 JM	156	if (sdata->u.mgd.associated)
b203ffc3 JM	157	ieee80211_offchannel_ps_disable(sdata);
b203ffc3 JM	158	}
b203ffc3 JM	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 {
	194	cfg80211_ready_on_channel(roc->sdata->dev, (unsigned long)roc,
	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))
2eb278e0 JB	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;
2eb278e0 JB	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)) {
2eb278e0 JB	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,
2eb278e0 JB	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) {
2eb278e0 JB	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) {
	302	cfg80211_mgmt_tx_status(roc->sdata->dev,
	303	(unsigned long)roc->frame,
	304	roc->frame->data, roc->frame->len,
	305	false, GFP_KERNEL);
	306	kfree_skb(roc->frame);
71ecfa18 JB	307	}
71ecfa18 JB	308
2eb278e0 JB	309	if (!roc->mgmt_tx_cookie)
	310	cfg80211_remain_on_channel_expired(roc->sdata->dev,
	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;
	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 */
21f83589	345
2eb278e0 JB	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
0f6b3f59 JB	382	if (roc->started)
0f6b3f59 JB	383	ieee80211_start_next_roc(local);
2eb278e0 JB	384	}
	385
	386	out_unlock:
	387	mutex_unlock(&local->mtx);
	388	}
	389
	390	static 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);
	394	struct ieee80211_roc_work *roc;
	395
	396	mutex_lock(&local->mtx);
	397
	398	if (list_empty(&local->roc_list))
	399	goto out_unlock;
	400
	401	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	402	list);
	403
	404	if (!roc->started)
	405	goto out_unlock;
	406
	407	list_del(&roc->list);
	408
	409	ieee80211_roc_notify_destroy(roc);
	410
	411	/* if there's another roc, start it now */
	412	ieee80211_start_next_roc(local);
	413
2eb278e0	414	out_unlock:
21f83589 JB	415	mutex_unlock(&local->mtx);
	416	}
	417
	418	void 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	}
	426	EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
	427
2eb278e0	428	void ieee80211_roc_setup(struct ieee80211_local *local)
21f83589 JB	429	{
	430	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
	431	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
2eb278e0 JB	432	INIT_LIST_HEAD(&local->roc_list);
	433	}
	434
	435	void 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);
2eb278e0 JB	456	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));
21f83589	471	}