Commit 89766727 authored by Vasanthakumar Thiagarajan's avatar Vasanthakumar Thiagarajan Committed by Johannes Berg
Browse files

cfg80211: Share Channel DFS state across wiphys of same DFS domain 



Sharing DFS channel state across multiple wiphys (radios) could
be useful with multiple radios on the system. When one radio
completes CAC and markes the channel available another radio
can use this information and start beaconing without really doing
CAC.

Whenever there is a state change in dfs channel associated to
a particular wiphy the the same state change is propagated to
other wiphys having the same DFS reg domain configuration.
Also when a new wiphy is created the dfs channel state of
other existing wiphys of same DFS domain is copied.

Signed-off-by: default avatarVasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 34373d12

net/wireless/chan.c

+23 −7
Original line number Diff line number Diff line
@@ -531,16 +531,11 @@ bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 
	return active;

}



bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,

static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,

					struct ieee80211_channel *chan)

{

	struct wireless_dev *wdev;



	ASSERT_RTNL();



	if (!(chan->flags & IEEE80211_CHAN_RADAR))

		return false;



	list_for_each_entry(wdev, &wiphy->wdev_list, list) {

		wdev_lock(wdev);

		if (!cfg80211_beaconing_iface_active(wdev)) {
@@ -558,6 +553,27 @@ bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 
	return false;

}



bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,

				  struct ieee80211_channel *chan)

{

	struct cfg80211_registered_device *rdev;



	ASSERT_RTNL();



	if (!(chan->flags & IEEE80211_CHAN_RADAR))

		return false;



	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {

		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))

			continue;



		if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))

			return true;

	}



	return false;

}



static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,

					     u32 center_freq,

					     u32 bandwidth)

net/wireless/core.c

+37 −0
Original line number Diff line number Diff line
@@ -357,6 +357,38 @@ static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 
	rtnl_unlock();

}



static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)

{

	struct cfg80211_registered_device *rdev;



	rdev = container_of(work, struct cfg80211_registered_device,

			    propagate_radar_detect_wk);



	rtnl_lock();



	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,

				       NL80211_DFS_UNAVAILABLE,

				       NL80211_RADAR_DETECTED);



	rtnl_unlock();

}



static void cfg80211_propagate_cac_done_wk(struct work_struct *work)

{

	struct cfg80211_registered_device *rdev;



	rdev = container_of(work, struct cfg80211_registered_device,

			    propagate_cac_done_wk);



	rtnl_lock();



	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,

				       NL80211_DFS_AVAILABLE,

				       NL80211_RADAR_CAC_FINISHED);



	rtnl_unlock();

}



/* exported functions */



struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
@@ -456,6 +488,9 @@ use_default_name: 
	spin_lock_init(&rdev->destroy_list_lock);

	INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);

	INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);

	INIT_WORK(&rdev->propagate_radar_detect_wk,

		  cfg80211_propagate_radar_detect_wk);

	INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);



#ifdef CONFIG_CFG80211_DEFAULT_PS

	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
@@ -915,6 +950,8 @@ void wiphy_unregister(struct wiphy *wiphy) 
	flush_work(&rdev->destroy_work);

	flush_work(&rdev->sched_scan_stop_wk);

	flush_work(&rdev->mlme_unreg_wk);

	flush_work(&rdev->propagate_radar_detect_wk);

	flush_work(&rdev->propagate_cac_done_wk);



#ifdef CONFIG_PM

	if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)

net/wireless/core.h

+6 −0
Original line number Diff line number Diff line
@@ -97,6 +97,12 @@ struct cfg80211_registered_device { 


	struct work_struct sched_scan_stop_wk;



	struct cfg80211_chan_def radar_chandef;

	struct work_struct propagate_radar_detect_wk;



	struct cfg80211_chan_def cac_done_chandef;

	struct work_struct propagate_cac_done_wk;



	/* must be last because of the way we do wiphy_priv(),

	 * and it should at least be aligned to NETDEV_ALIGN */

	struct wiphy wiphy __aligned(NETDEV_ALIGN);

net/wireless/mlme.c

+10 −0
Original line number Diff line number Diff line
@@ -810,6 +810,10 @@ void cfg80211_dfs_channels_update_work(struct work_struct *work) 
				nl80211_radar_notify(rdev, &chandef,

						     radar_event, NULL,

						     GFP_ATOMIC);



				regulatory_propagate_dfs_state(wiphy, &chandef,

							       c->dfs_state,

							       radar_event);

				continue;

			}
@@ -846,6 +850,9 @@ void cfg80211_radar_event(struct wiphy *wiphy, 
	cfg80211_sched_dfs_chan_update(rdev);



	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);



	memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));

	queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);

}

EXPORT_SYMBOL(cfg80211_radar_event);
@@ -872,6 +879,9 @@ void cfg80211_cac_event(struct net_device *netdev, 
			  msecs_to_jiffies(wdev->cac_time_ms);

		WARN_ON(!time_after_eq(jiffies, timeout));

		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);

		memcpy(&rdev->cac_done_chandef, chandef,

		       sizeof(struct cfg80211_chan_def));

		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);

		cfg80211_sched_dfs_chan_update(rdev);

		break;

	case NL80211_RADAR_CAC_ABORTED:

net/wireless/reg.c

+120 −0
Original line number Diff line number Diff line
@@ -2067,6 +2067,88 @@ reg_process_hint_country_ie(struct wiphy *wiphy, 
	return REG_REQ_IGNORE;

}



bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)

{

	const struct ieee80211_regdomain *wiphy1_regd = NULL;

	const struct ieee80211_regdomain *wiphy2_regd = NULL;

	const struct ieee80211_regdomain *cfg80211_regd = NULL;

	bool dfs_domain_same;



	rcu_read_lock();



	cfg80211_regd = rcu_dereference(cfg80211_regdomain);

	wiphy1_regd = rcu_dereference(wiphy1->regd);

	if (!wiphy1_regd)

		wiphy1_regd = cfg80211_regd;



	wiphy2_regd = rcu_dereference(wiphy2->regd);

	if (!wiphy2_regd)

		wiphy2_regd = cfg80211_regd;



	dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;



	rcu_read_unlock();



	return dfs_domain_same;

}



static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,

				    struct ieee80211_channel *src_chan)

{

	if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||

	    !(src_chan->flags & IEEE80211_CHAN_RADAR))

		return;



	if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||

	    src_chan->flags & IEEE80211_CHAN_DISABLED)

		return;



	if (src_chan->center_freq == dst_chan->center_freq &&

	    dst_chan->dfs_state == NL80211_DFS_USABLE) {

		dst_chan->dfs_state = src_chan->dfs_state;

		dst_chan->dfs_state_entered = src_chan->dfs_state_entered;

	}

}



static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,

				       struct wiphy *src_wiphy)

{

	struct ieee80211_supported_band *src_sband, *dst_sband;

	struct ieee80211_channel *src_chan, *dst_chan;

	int i, j, band;



	if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))

		return;



	for (band = 0; band < NUM_NL80211_BANDS; band++) {

		dst_sband = dst_wiphy->bands[band];

		src_sband = src_wiphy->bands[band];

		if (!dst_sband || !src_sband)

			continue;



		for (i = 0; i < dst_sband->n_channels; i++) {

			dst_chan = &dst_sband->channels[i];

			for (j = 0; j < src_sband->n_channels; j++) {

				src_chan = &src_sband->channels[j];

				reg_copy_dfs_chan_state(dst_chan, src_chan);

			}

		}

	}

}



static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)

{

	struct cfg80211_registered_device *rdev;



	ASSERT_RTNL();



	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {

		if (wiphy == &rdev->wiphy)

			continue;

		wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);

	}

}



/* This processes *all* regulatory hints */

static void reg_process_hint(struct regulatory_request *reg_request)

{
@@ -2110,6 +2192,7 @@ static void reg_process_hint(struct regulatory_request *reg_request) 
	if (treatment == REG_REQ_ALREADY_SET && wiphy &&

	    wiphy->regulatory_flags & REGULATORY_STRICT_REG) {

		wiphy_update_regulatory(wiphy, reg_request->initiator);

		wiphy_all_share_dfs_chan_state(wiphy);

		reg_check_channels();

	}
@@ -3061,6 +3144,7 @@ void wiphy_regulatory_register(struct wiphy *wiphy) 


	lr = get_last_request();

	wiphy_update_regulatory(wiphy, lr->initiator);

	wiphy_all_share_dfs_chan_state(wiphy);

}



void wiphy_regulatory_deregister(struct wiphy *wiphy)
@@ -3148,6 +3232,42 @@ bool regulatory_pre_cac_allowed(struct wiphy *wiphy) 
	return pre_cac_allowed;

}



void regulatory_propagate_dfs_state(struct wiphy *wiphy,

				    struct cfg80211_chan_def *chandef,

				    enum nl80211_dfs_state dfs_state,

				    enum nl80211_radar_event event)

{

	struct cfg80211_registered_device *rdev;



	ASSERT_RTNL();



	if (WARN_ON(!cfg80211_chandef_valid(chandef)))

		return;



	if (WARN_ON(!(chandef->chan->flags & IEEE80211_CHAN_RADAR)))

		return;



	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {

		if (wiphy == &rdev->wiphy)

			continue;



		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))

			continue;



		if (!ieee80211_get_channel(&rdev->wiphy,

					   chandef->chan->center_freq))

			continue;



		cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);



		if (event == NL80211_RADAR_DETECTED ||

		    event == NL80211_RADAR_CAC_FINISHED)

			cfg80211_sched_dfs_chan_update(rdev);



		nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);

	}

}



int __init regulatory_init(void)

{

	int err = 0;

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