[linux-2.6-block.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;

	if (WARN_ON(local->use_chanctx))
		return;

	/*
	 * 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_P2P_DEVICE)
			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;

	if (WARN_ON(local->use_chanctx))
		return;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
			continue;

		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_tid_band(roc->sdata, roc->frame, 7,
						  roc->chan->band);
			roc->frame = NULL;
		}
	} else {
		cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
					  roc->chan, 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_move(&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->sdata, roc->chan,
					    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->wdev,
					(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->wdev,
						   roc->cookie, roc->chan,
						   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;
	bool started;

	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;
		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);
		started = roc->started;
		ieee80211_roc_notify_destroy(roc);

		if (started) {
			drv_flush(local, false);

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

			ieee80211_offchannel_return(local, true);
		}

		ieee80211_recalc_idle(local);

		if (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;
	}
	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
fe57d9f5 JB	110	if (WARN_ON(local->use_chanctx))
	111	return;
	112
b23b025f BG	113	/*
	114	* notify the AP about us leaving the channel and stop all
	115	* STA interfaces.
	116	*/
b203ffc3 JM	117	mutex_lock(&local->iflist_mtx);
	118	list_for_each_entry(sdata, &local->interfaces, list) {
	119	if (!ieee80211_sdata_running(sdata))
	120	continue;
	121
f142c6b9 JB	122	if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
	123	continue;
	124
b23b025f BG	125	if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
	126	set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
	127
	128	/* Check to see if we should disable beaconing. */
b203ffc3 JM	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);
	134
b23b025f	135	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
cfa6cb20	136	netif_tx_stop_all_queues(sdata->dev);
b23b025f BG	137	if (offchannel_ps_enable &&
	138	(sdata->vif.type == NL80211_IFTYPE_STATION) &&
	139	sdata->u.mgd.associated)
559cef99	140	ieee80211_offchannel_ps_enable(sdata);
5b714c6a	141	}
b203ffc3 JM	142	}
	143	mutex_unlock(&local->iflist_mtx);
	144	}
	145
b203ffc3	146	void ieee80211_offchannel_return(struct ieee80211_local *local,
b23b025f	147	bool offchannel_ps_disable)
b203ffc3 JM	148	{
	149	struct ieee80211_sub_if_data *sdata;
	150
fe57d9f5 JB	151	if (WARN_ON(local->use_chanctx))
	152	return;
	153
b203ffc3 JM	154	mutex_lock(&local->iflist_mtx);
b203ffc3 JM	155	list_for_each_entry(sdata, &local->interfaces, list) {
f142c6b9 JB	156	if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
	157	continue;
	158
f6e8cb72 EP	159	if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
	160	clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
	161
b203ffc3 JM	162	if (!ieee80211_sdata_running(sdata))
	163	continue;
	164
	165	/* Tell AP we're back */
b23b025f BG	166	if (offchannel_ps_disable &&
b23b025f BG	167	sdata->vif.type == NL80211_IFTYPE_STATION) {
b203ffc3 JM	168	if (sdata->u.mgd.associated)
b203ffc3 JM	169	ieee80211_offchannel_ps_disable(sdata);
b203ffc3 JM	170	}
b203ffc3 JM	171
5b714c6a	172	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
5b714c6a JB	173	/*
	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.
	182	*/
93895757	183	netif_tx_wake_all_queues(sdata->dev);
5b714c6a	184	}
93895757	185
e76aadc5 JB	186	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
	187	sdata->vif.type == NL80211_IFTYPE_ADHOC \|\|
	188	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
b203ffc3 JM	189	ieee80211_bss_info_change_notify(
	190	sdata, BSS_CHANGED_BEACON_ENABLED);
	191	}
	192	mutex_unlock(&local->iflist_mtx);
	193	}
21f83589	194
2eb278e0 JB	195	void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc)
	196	{
	197	if (roc->notified)
	198	return;
	199
	200	if (roc->mgmt_tx_cookie) {
	201	if (!WARN_ON(!roc->frame)) {
55de908a JB	202	ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7,
55de908a JB	203	roc->chan->band);
2eb278e0 JB	204	roc->frame = NULL;
	205	}
	206	} else {
50febf6a	207	cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
42d97a59 JB	208	roc->chan, roc->req_duration,
42d97a59 JB	209	GFP_KERNEL);
2eb278e0 JB	210	}
	211
	212	roc->notified = true;
	213	}
	214
21f83589 JB	215	static void ieee80211_hw_roc_start(struct work_struct *work)
	216	{
	217	struct ieee80211_local *local =
	218	container_of(work, struct ieee80211_local, hw_roc_start);
2eb278e0	219	struct ieee80211_roc_work roc, dep, *tmp;
21f83589 JB	220
	221	mutex_lock(&local->mtx);
	222
2eb278e0 JB	223	if (list_empty(&local->roc_list))
2eb278e0 JB	224	goto out_unlock;
21f83589	225
2eb278e0 JB	226	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	227	list);
	228
	229	if (!roc->started)
	230	goto out_unlock;
	231
	232	roc->hw_begun = true;
	233	roc->hw_start_time = local->hw_roc_start_time;
90fc4b3a	234
2eb278e0 JB	235	ieee80211_handle_roc_started(roc);
	236	list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
	237	ieee80211_handle_roc_started(dep);
	238
	239	if (dep->duration > roc->duration) {
	240	u32 dur = dep->duration;
	241	dep->duration = dur - roc->duration;
	242	roc->duration = dur;
a4ed5346	243	list_move(&dep->list, &roc->list);
2eb278e0 JB	244	}
	245	}
	246	out_unlock:
21f83589 JB	247	mutex_unlock(&local->mtx);
	248	}
	249
	250	void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
	251	{
	252	struct ieee80211_local *local = hw_to_local(hw);
	253
2eb278e0 JB	254	local->hw_roc_start_time = jiffies;
2eb278e0 JB	255
21f83589 JB	256	trace_api_ready_on_channel(local);
	257
	258	ieee80211_queue_work(hw, &local->hw_roc_start);
	259	}
	260	EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
	261
2eb278e0	262	void ieee80211_start_next_roc(struct ieee80211_local *local)
21f83589	263	{
2eb278e0	264	struct ieee80211_roc_work *roc;
21f83589	265
2eb278e0	266	lockdep_assert_held(&local->mtx);
21f83589	267
2eb278e0 JB	268	if (list_empty(&local->roc_list)) {
2eb278e0 JB	269	ieee80211_run_deferred_scan(local);
21f83589 JB	270	return;
	271	}
	272
2eb278e0 JB	273	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
2eb278e0 JB	274	list);
71ecfa18	275
0f6b3f59 JB	276	if (WARN_ON_ONCE(roc->started))
	277	return;
	278
2eb278e0 JB	279	if (local->ops->remain_on_channel) {
2eb278e0 JB	280	int ret, duration = roc->duration;
71ecfa18	281
2eb278e0 JB	282	/* XXX: duplicated, see ieee80211_start_roc_work() */
	283	if (!duration)
	284	duration = 10;
71ecfa18	285
49884568	286	ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
2eb278e0 JB	287	duration);
	288
	289	roc->started = true;
	290
	291	if (ret) {
	292	wiphy_warn(local->hw.wiphy,
	293	"failed to start next HW ROC (%d)\n", ret);
	294	/*
	295	* queue the work struct again to avoid recursion
	296	* when multiple failures occur
	297	*/
	298	ieee80211_remain_on_channel_expired(&local->hw);
	299	}
	300	} else {
	301	/* delay it a bit */
	302	ieee80211_queue_delayed_work(&local->hw, &roc->work,
	303	round_jiffies_relative(HZ/2));
	304	}
	305	}
	306
	307	void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
	308	{
	309	struct ieee80211_roc_work dep, tmp;
	310
	311	/* was never transmitted */
	312	if (roc->frame) {
71bbc994	313	cfg80211_mgmt_tx_status(&roc->sdata->wdev,
2eb278e0 JB	314	(unsigned long)roc->frame,
	315	roc->frame->data, roc->frame->len,
	316	false, GFP_KERNEL);
	317	kfree_skb(roc->frame);
71ecfa18 JB	318	}
71ecfa18 JB	319
2eb278e0	320	if (!roc->mgmt_tx_cookie)
71bbc994	321	cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
50febf6a	322	roc->cookie, roc->chan,
42d97a59	323	GFP_KERNEL);
21f83589	324
2eb278e0 JB	325	list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
	326	ieee80211_roc_notify_destroy(dep);
	327
	328	kfree(roc);
	329	}
	330
	331	void ieee80211_sw_roc_work(struct work_struct *work)
	332	{
	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;
4b4b8229	337	bool started;
2eb278e0 JB	338
	339	mutex_lock(&local->mtx);
	340
	341	if (roc->abort)
	342	goto finish;
	343
	344	if (WARN_ON(list_empty(&local->roc_list)))
	345	goto out_unlock;
	346
	347	if (WARN_ON(roc != list_first_entry(&local->roc_list,
	348	struct ieee80211_roc_work,
	349	list)))
	350	goto out_unlock;
	351
	352	if (!roc->started) {
	353	struct ieee80211_roc_work *dep;
	354
	355	/* start this ROC */
21f83589	356
2eb278e0 JB	357	/* switch channel etc */
	358	ieee80211_recalc_idle(local);
	359
	360	local->tmp_channel = roc->chan;
2eb278e0 JB	361	ieee80211_hw_config(local, 0);
	362
	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);
	367
	368	/* if it was pure TX, just finish right away */
	369	if (!roc->duration)
	370	goto finish;
	371
	372	roc->started = true;
	373	ieee80211_queue_delayed_work(&local->hw, &roc->work,
	374	msecs_to_jiffies(roc->duration));
	375	} else {
	376	/* finish this ROC */
	377	finish:
	378	list_del(&roc->list);
4b4b8229	379	started = roc->started;
2eb278e0 JB	380	ieee80211_roc_notify_destroy(roc);
2eb278e0 JB	381
4b4b8229	382	if (started) {
2eb278e0 JB	383	drv_flush(local, false);
	384
	385	local->tmp_channel = NULL;
	386	ieee80211_hw_config(local, 0);
	387
	388	ieee80211_offchannel_return(local, true);
	389	}
	390
	391	ieee80211_recalc_idle(local);
	392
4b4b8229	393	if (started)
0f6b3f59	394	ieee80211_start_next_roc(local);
2eb278e0 JB	395	}
	396
	397	out_unlock:
	398	mutex_unlock(&local->mtx);
	399	}
	400
	401	static void ieee80211_hw_roc_done(struct work_struct *work)
	402	{
	403	struct ieee80211_local *local =
	404	container_of(work, struct ieee80211_local, hw_roc_done);
	405	struct ieee80211_roc_work *roc;
	406
	407	mutex_lock(&local->mtx);
	408
	409	if (list_empty(&local->roc_list))
	410	goto out_unlock;
	411
	412	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	413	list);
	414
	415	if (!roc->started)
	416	goto out_unlock;
	417
	418	list_del(&roc->list);
	419
	420	ieee80211_roc_notify_destroy(roc);
	421
	422	/* if there's another roc, start it now */
	423	ieee80211_start_next_roc(local);
	424
2eb278e0	425	out_unlock:
21f83589 JB	426	mutex_unlock(&local->mtx);
	427	}
	428
	429	void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
	430	{
	431	struct ieee80211_local *local = hw_to_local(hw);
	432
	433	trace_api_remain_on_channel_expired(local);
	434
	435	ieee80211_queue_work(hw, &local->hw_roc_done);
	436	}
	437	EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
	438
2eb278e0	439	void ieee80211_roc_setup(struct ieee80211_local *local)
21f83589 JB	440	{
	441	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
	442	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
2eb278e0 JB	443	INIT_LIST_HEAD(&local->roc_list);
	444	}
	445
	446	void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
	447	{
	448	struct ieee80211_local *local = sdata->local;
	449	struct ieee80211_roc_work roc, tmp;
	450	LIST_HEAD(tmp_list);
	451
	452	mutex_lock(&local->mtx);
	453	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
	454	if (roc->sdata != sdata)
	455	continue;
	456
	457	if (roc->started && local->ops->remain_on_channel) {
	458	/* can race, so ignore return value */
	459	drv_cancel_remain_on_channel(local);
	460	}
	461
	462	list_move_tail(&roc->list, &tmp_list);
	463	roc->abort = true;
	464	}
2eb278e0 JB	465	mutex_unlock(&local->mtx);
	466
	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);
	471	} else {
	472	ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
	473
	474	/* work will clean up etc */
	475	flush_delayed_work(&roc->work);
	476	}
	477	}
	478
	479	WARN_ON_ONCE(!list_empty(&tmp_list));
21f83589	480	}