wifi: mac80211: handle DFS per link

In order to support DFS with MLO, handle the link ID now passed from
cfg80211, adjust the code to do everything per link and call the
notifications to cfg80211 correctly.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://patch.msgid.link/20240906064426.2101315-7-quic_adisi@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 47 insertions, 17 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 67dd780530fb..57e66c671e2e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3467,6 +3467,7 @@ static int ieee80211_start_radar_detection(struct wiphy *wiphy,
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_chan_req chanreq = { .oper = *chandef };
 	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_link_data *link_data;
 	int err;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
@@ -3474,16 +3475,20 @@ static int ieee80211_start_radar_detection(struct wiphy *wiphy,
 	if (!list_empty(&local->roc_list) || local->scanning)
 		return -EBUSY;
 
+	link_data = sdata_dereference(sdata->link[link_id], sdata);
+	if (!link_data)
+		return -ENOLINK;
+
 	/* whatever, but channel contexts should not complain about that one */
-	sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
-	sdata->deflink.needed_rx_chains = local->rx_chains;
+	link_data->smps_mode = IEEE80211_SMPS_OFF;
+	link_data->needed_rx_chains = local->rx_chains;
 
-	err = ieee80211_link_use_channel(&sdata->deflink, &chanreq,
+	err = ieee80211_link_use_channel(link_data, &chanreq,
 					 IEEE80211_CHANCTX_SHARED);
 	if (err)
 		return err;
 
-	wiphy_delayed_work_queue(wiphy, &sdata->deflink.dfs_cac_timer_work,
+	wiphy_delayed_work_queue(wiphy, &link_data->dfs_cac_timer_work,
 				 msecs_to_jiffies(cac_time_ms));
 
 	return 0;
@@ -3494,16 +3499,21 @@ static void ieee80211_end_cac(struct wiphy *wiphy,
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_link_data *link_data;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
 	list_for_each_entry(sdata, &local->interfaces, list) {
+		link_data = sdata_dereference(sdata->link[link_id], sdata);
+		if (!link_data)
+			continue;
+
 		wiphy_delayed_work_cancel(wiphy,
-					  &sdata->deflink.dfs_cac_timer_work);
+					  &link_data->dfs_cac_timer_work);
 
-		if (sdata->wdev.links[0].cac_started) {
-			ieee80211_link_release_channel(&sdata->deflink);
-			sdata->wdev.links[0].cac_started = false;
+		if (sdata->wdev.links[link_id].cac_started) {
+			ieee80211_link_release_channel(link_data);
+			sdata->wdev.links[link_id].cac_started = false;
 		}
 	}
 }
diff --git a/net/mac80211/link.c b/net/mac80211/link.c
index b4378969cbf1..0bbac64d5fa0 100644
--- a/net/mac80211/link.c
+++ b/net/mac80211/link.c
@@ -77,6 +77,16 @@ void ieee80211_link_stop(struct ieee80211_link_data *link)
 			  &link->color_change_finalize_work);
 	wiphy_work_cancel(link->sdata->local->hw.wiphy,
 			  &link->csa.finalize_work);
+
+	if (link->sdata->wdev.links[link->link_id].cac_started) {
+		wiphy_delayed_work_cancel(link->sdata->local->hw.wiphy,
+					  &link->dfs_cac_timer_work);
+		cfg80211_cac_event(link->sdata->dev,
+				   &link->conf->chanreq.oper,
+				   NL80211_RADAR_CAC_ABORTED,
+				   GFP_KERNEL, link->link_id);
+	}
+
 	ieee80211_link_release_channel(link);
 }
 
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index c4fd60fbcfd4..2e37d2639074 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -3471,20 +3471,30 @@ void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
 {
 	struct ieee80211_sub_if_data *sdata;
 	struct cfg80211_chan_def chandef;
+	struct ieee80211_link_data *link;
+	unsigned int link_id;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
 	list_for_each_entry(sdata, &local->interfaces, list) {
-		wiphy_delayed_work_cancel(local->hw.wiphy,
-					  &sdata->deflink.dfs_cac_timer_work);
-
-		if (sdata->wdev.links[0].cac_started) {
-			chandef = sdata->vif.bss_conf.chanreq.oper;
-			ieee80211_link_release_channel(&sdata->deflink);
-			cfg80211_cac_event(sdata->dev,
-					   &chandef,
+		for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
+		     link_id++) {
+			link = sdata_dereference(sdata->link[link_id],
+						 sdata);
+			if (!link)
+				continue;
+
+			wiphy_delayed_work_cancel(local->hw.wiphy,
+						  &link->dfs_cac_timer_work);
+
+			if (!sdata->wdev.links[link_id].cac_started)
+				continue;
+
+			chandef = link->conf->chanreq.oper;
+			ieee80211_link_release_channel(link);
+			cfg80211_cac_event(sdata->dev, &chandef,
 					   NL80211_RADAR_CAC_ABORTED,
-					   GFP_KERNEL, 0);
+					   GFP_KERNEL, link_id);
 		}
 	}
 }