[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)
{
	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.
	 */

	ieee80211_stop_queues_by_reason(&local->hw,
					IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);

	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.bss_conf.enable_beacon) {
			set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
				&sdata->state);
			sdata->vif.bss_conf.enable_beacon = false;
			ieee80211_bss_info_change_notify(
				sdata, BSS_CHANGED_BEACON_ENABLED);
		}

		if (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)
{
	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 (sdata->vif.type == NL80211_IFTYPE_STATION &&
		    sdata->u.mgd.associated)
			ieee80211_offchannel_ps_disable(sdata);

		if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
				       &sdata->state)) {
			sdata->vif.bss_conf.enable_beacon = true;
			ieee80211_bss_info_change_notify(
				sdata, BSS_CHANGED_BEACON_ENABLED);
		}
	}
	mutex_unlock(&local->iflist_mtx);

	ieee80211_wake_queues_by_reason(&local->hw,
					IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);
}

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);
		}

		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
aacde9ee	105	void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local)
b203ffc3 JM	106	{
	107	struct ieee80211_sub_if_data *sdata;
	108
fe57d9f5 JB	109	if (WARN_ON(local->use_chanctx))
	110	return;
	111
b23b025f BG	112	/*
	113	* notify the AP about us leaving the channel and stop all
	114	* STA interfaces.
	115	*/
6c17b77b SF	116
	117	ieee80211_stop_queues_by_reason(&local->hw,
	118	IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);
	119
b203ffc3 JM	120	mutex_lock(&local->iflist_mtx);
	121	list_for_each_entry(sdata, &local->interfaces, list) {
	122	if (!ieee80211_sdata_running(sdata))
	123	continue;
	124
f142c6b9 JB	125	if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
	126	continue;
	127
b23b025f BG	128	if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
	129	set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
	130
	131	/* Check to see if we should disable beaconing. */
d6a83228 JB	132	if (sdata->vif.bss_conf.enable_beacon) {
	133	set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
	134	&sdata->state);
	135	sdata->vif.bss_conf.enable_beacon = false;
b203ffc3 JM	136	ieee80211_bss_info_change_notify(
b203ffc3 JM	137	sdata, BSS_CHANGED_BEACON_ENABLED);
d6a83228	138	}
b203ffc3	139
6c17b77b SF	140	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	141	sdata->u.mgd.associated)
	142	ieee80211_offchannel_ps_enable(sdata);
b203ffc3 JM	143	}
	144	mutex_unlock(&local->iflist_mtx);
	145	}
	146
aacde9ee	147	void ieee80211_offchannel_return(struct ieee80211_local *local)
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 */
aacde9ee SG	166	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	167	sdata->u.mgd.associated)
	168	ieee80211_offchannel_ps_disable(sdata);
b203ffc3	169
d6a83228 JB	170	if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
	171	&sdata->state)) {
	172	sdata->vif.bss_conf.enable_beacon = true;
b203ffc3 JM	173	ieee80211_bss_info_change_notify(
b203ffc3 JM	174	sdata, BSS_CHANGED_BEACON_ENABLED);
d6a83228	175	}
b203ffc3 JM	176	}
b203ffc3 JM	177	mutex_unlock(&local->iflist_mtx);
6c17b77b SF	178
	179	ieee80211_wake_queues_by_reason(&local->hw,
	180	IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);
b203ffc3	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)) {
55de908a JB	190	ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7,
55de908a JB	191	roc->chan->band);
2eb278e0 JB	192	roc->frame = NULL;
	193	}
	194	} else {
50febf6a	195	cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
42d97a59 JB	196	roc->chan, roc->req_duration,
42d97a59 JB	197	GFP_KERNEL);
2eb278e0 JB	198	}
	199
	200	roc->notified = true;
	201	}
	202
21f83589 JB	203	static void ieee80211_hw_roc_start(struct work_struct *work)
	204	{
	205	struct ieee80211_local *local =
	206	container_of(work, struct ieee80211_local, hw_roc_start);
2eb278e0	207	struct ieee80211_roc_work roc, dep, *tmp;
21f83589 JB	208
	209	mutex_lock(&local->mtx);
	210
2eb278e0 JB	211	if (list_empty(&local->roc_list))
2eb278e0 JB	212	goto out_unlock;
21f83589	213
2eb278e0 JB	214	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	215	list);
	216
	217	if (!roc->started)
	218	goto out_unlock;
	219
	220	roc->hw_begun = true;
	221	roc->hw_start_time = local->hw_roc_start_time;
90fc4b3a	222
2eb278e0 JB	223	ieee80211_handle_roc_started(roc);
	224	list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
	225	ieee80211_handle_roc_started(dep);
	226
	227	if (dep->duration > roc->duration) {
	228	u32 dur = dep->duration;
	229	dep->duration = dur - roc->duration;
	230	roc->duration = dur;
a4ed5346	231	list_move(&dep->list, &roc->list);
2eb278e0 JB	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
49884568	274	ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
2eb278e0 JB	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) {
71bbc994	301	cfg80211_mgmt_tx_status(&roc->sdata->wdev,
2eb278e0 JB	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	308	if (!roc->mgmt_tx_cookie)
71bbc994	309	cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
50febf6a	310	roc->cookie, roc->chan,
42d97a59	311	GFP_KERNEL);
21f83589	312
2eb278e0 JB	313	list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
	314	ieee80211_roc_notify_destroy(dep);
	315
	316	kfree(roc);
	317	}
	318
	319	void ieee80211_sw_roc_work(struct work_struct *work)
	320	{
	321	struct ieee80211_roc_work *roc =
	322	container_of(work, struct ieee80211_roc_work, work.work);
	323	struct ieee80211_sub_if_data *sdata = roc->sdata;
	324	struct ieee80211_local *local = sdata->local;
4b4b8229	325	bool started;
2eb278e0 JB	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;
2eb278e0 JB	349	ieee80211_hw_config(local, 0);
	350
	351	/* tell userspace or send frame */
	352	ieee80211_handle_roc_started(roc);
	353	list_for_each_entry(dep, &roc->dependents, list)
	354	ieee80211_handle_roc_started(dep);
	355
	356	/* if it was pure TX, just finish right away */
	357	if (!roc->duration)
	358	goto finish;
	359
	360	roc->started = true;
	361	ieee80211_queue_delayed_work(&local->hw, &roc->work,
	362	msecs_to_jiffies(roc->duration));
	363	} else {
	364	/* finish this ROC */
	365	finish:
	366	list_del(&roc->list);
4b4b8229	367	started = roc->started;
2eb278e0 JB	368	ieee80211_roc_notify_destroy(roc);
2eb278e0 JB	369
4b4b8229	370	if (started) {
2eb278e0 JB	371	drv_flush(local, false);
	372
	373	local->tmp_channel = NULL;
	374	ieee80211_hw_config(local, 0);
	375
aacde9ee	376	ieee80211_offchannel_return(local);
2eb278e0 JB	377	}
	378
	379	ieee80211_recalc_idle(local);
	380
4b4b8229	381	if (started)
0f6b3f59	382	ieee80211_start_next_roc(local);
2eb278e0 JB	383	}
	384
	385	out_unlock:
	386	mutex_unlock(&local->mtx);
	387	}
	388
	389	static void ieee80211_hw_roc_done(struct work_struct *work)
	390	{
	391	struct ieee80211_local *local =
	392	container_of(work, struct ieee80211_local, hw_roc_done);
	393	struct ieee80211_roc_work *roc;
	394
	395	mutex_lock(&local->mtx);
	396
	397	if (list_empty(&local->roc_list))
	398	goto out_unlock;
	399
	400	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
	401	list);
	402
	403	if (!roc->started)
	404	goto out_unlock;
	405
	406	list_del(&roc->list);
	407
	408	ieee80211_roc_notify_destroy(roc);
	409
	410	/* if there's another roc, start it now */
	411	ieee80211_start_next_roc(local);
	412
2eb278e0	413	out_unlock:
21f83589 JB	414	mutex_unlock(&local->mtx);
	415	}
	416
	417	void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
	418	{
	419	struct ieee80211_local *local = hw_to_local(hw);
	420
	421	trace_api_remain_on_channel_expired(local);
	422
	423	ieee80211_queue_work(hw, &local->hw_roc_done);
	424	}
	425	EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
	426
2eb278e0	427	void ieee80211_roc_setup(struct ieee80211_local *local)
21f83589 JB	428	{
	429	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
	430	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
2eb278e0 JB	431	INIT_LIST_HEAD(&local->roc_list);
	432	}
	433
	434	void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
	435	{
	436	struct ieee80211_local *local = sdata->local;
	437	struct ieee80211_roc_work roc, tmp;
	438	LIST_HEAD(tmp_list);
	439
	440	mutex_lock(&local->mtx);
	441	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
	442	if (roc->sdata != sdata)
	443	continue;
	444
	445	if (roc->started && local->ops->remain_on_channel) {
	446	/* can race, so ignore return value */
	447	drv_cancel_remain_on_channel(local);
	448	}
	449
	450	list_move_tail(&roc->list, &tmp_list);
	451	roc->abort = true;
	452	}
2eb278e0 JB	453	mutex_unlock(&local->mtx);
	454
	455	list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
	456	if (local->ops->remain_on_channel) {
	457	list_del(&roc->list);
	458	ieee80211_roc_notify_destroy(roc);
	459	} else {
	460	ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
	461
	462	/* work will clean up etc */
	463	flush_delayed_work(&roc->work);
	464	}
	465	}
	466
	467	WARN_ON_ONCE(!list_empty(&tmp_list));
21f83589	468	}