[PATCH 7/9] wifi: mac80211: handle DFS on per link

[Aditya Kumar Singh <quic_adisi@xxxxxxxxxxx>]

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@xxxxxxxxxxx>
---
 net/mac80211/cfg.c  | 28 ++++++++++++++++++++--------
 net/mac80211/util.c | 29 +++++++++++++++++++++++------
 2 files changed, 43 insertions(+), 14 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b2cd43d807ed..091508481f43 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3471,6 +3471,7 @@ 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);
@@ -3480,16 +3481,22 @@ static int ieee80211_start_radar_detection(struct wiphy *wiphy,
 		goto return_err;
 	}
 
+	link_data = sdata_dereference(sdata->link[link_id], sdata);
+	if (!link_data) {
+		err = -ENOLINK;
+		goto return_err;
+	}
+
 	/* 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)
 		goto 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_err:
@@ -3501,16 +3508,21 @@ 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/util.c b/net/mac80211/util.c
index 1dfb61082a9c..3d34e07f441b 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -3453,20 +3453,37 @@ 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_data;
+	struct ieee80211_bss_conf *link_conf;
+	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);
+		for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
+		     link_id++) {
+			link_data = sdata_dereference(sdata->link[link_id],
+						      sdata);
+			if (!link_data)
+				continue;
+
+			wiphy_delayed_work_cancel(local->hw.wiphy,
+						  &link_data->dfs_cac_timer_work);
+
+			if (!sdata->wdev.links[link_id].cac_started)
+				continue;
+
+			link_conf =
+				rcu_dereference(sdata->vif.link_conf[link_id]);
+			if (!link_conf)
+				continue;
 
-		if (sdata->wdev.links[0].cac_started) {
-			chandef = sdata->vif.bss_conf.chanreq.oper;
-			ieee80211_link_release_channel(&sdata->deflink);
+			chandef = link_conf->chanreq.oper;
+			ieee80211_link_release_channel(link_data);
 			cfg80211_cac_event(sdata->dev,
 					   &chandef,
 					   NL80211_RADAR_CAC_ABORTED,
-					   GFP_KERNEL, 0);
+					   GFP_KERNEL, link_id);
 		}
 	}
 }
-- 
2.34.1