wifi: mac80211: Adjust CQM handling for MLO

The CQM handling did not consider the MLO case and thus notified
a not-existing link with the CQM change. To fix this, propagate
the CQM notification to all the active links (handling both the
non-MLO and MLO cases).

TODO: this currently propagates the same configuration to all
links regardless of the band. This might not be the correct
approach as different links might need to be configured with
different values.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240228094753.bf6a3fefe553.Id738810b73e1087e01d5885508b70a3631707627@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -3290,33 +3290,57 @@ static int ieee80211_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
 	return 0;
 }
 
+static void ieee80211_set_cqm_rssi_link(struct ieee80211_sub_if_data *sdata,
+					struct ieee80211_link_data *link,
+					s32 rssi_thold, u32 rssi_hyst,
+					s32 rssi_low, s32 rssi_high)
+{
+	struct ieee80211_bss_conf *conf;
+
+	if (!link || !link->conf)
+		return;
+
+	conf = link->conf;
+
+	if (rssi_thold && rssi_hyst &&
+	    rssi_thold == conf->cqm_rssi_thold &&
+	    rssi_hyst == conf->cqm_rssi_hyst)
+		return;
+
+	conf->cqm_rssi_thold = rssi_thold;
+	conf->cqm_rssi_hyst = rssi_hyst;
+	conf->cqm_rssi_low = rssi_low;
+	conf->cqm_rssi_high = rssi_high;
+	link->u.mgd.last_cqm_event_signal = 0;
+
+	if (!ieee80211_vif_link_active(&sdata->vif, link->link_id))
+		return;
+
+	if (sdata->u.mgd.associated &&
+	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
+		ieee80211_link_info_change_notify(sdata, link, BSS_CHANGED_CQM);
+}
+
 static int ieee80211_set_cqm_rssi_config(struct wiphy *wiphy,
 					 struct net_device *dev,
 					 s32 rssi_thold, u32 rssi_hyst)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_vif *vif = &sdata->vif;
-	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
-
-	if (rssi_thold == bss_conf->cqm_rssi_thold &&
-	    rssi_hyst == bss_conf->cqm_rssi_hyst)
-		return 0;
+	int link_id;
 
-	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER &&
-	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
+	if (vif->driver_flags & IEEE80211_VIF_BEACON_FILTER &&
+	    !(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 		return -EOPNOTSUPP;
 
-	bss_conf->cqm_rssi_thold = rssi_thold;
-	bss_conf->cqm_rssi_hyst = rssi_hyst;
-	bss_conf->cqm_rssi_low = 0;
-	bss_conf->cqm_rssi_high = 0;
-	sdata->deflink.u.mgd.last_cqm_event_signal = 0;
+	/* For MLD, handle CQM change on all the active links */
+	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+		struct ieee80211_link_data *link =
+			sdata_dereference(sdata->link[link_id], sdata);
 
-	/* tell the driver upon association, unless already associated */
-	if (sdata->u.mgd.associated &&
-	    sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)
-		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
-						  BSS_CHANGED_CQM);
+		ieee80211_set_cqm_rssi_link(sdata, link, rssi_thold, rssi_hyst,
+					    0, 0);
+	}
 
 	return 0;
 }
@@ -3327,22 +3351,19 @@ static int ieee80211_set_cqm_rssi_range_config(struct wiphy *wiphy,
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_vif *vif = &sdata->vif;
-	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
+	int link_id;
 
-	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
+	if (vif->driver_flags & IEEE80211_VIF_BEACON_FILTER)
 		return -EOPNOTSUPP;
 
-	bss_conf->cqm_rssi_low = rssi_low;
-	bss_conf->cqm_rssi_high = rssi_high;
-	bss_conf->cqm_rssi_thold = 0;
-	bss_conf->cqm_rssi_hyst = 0;
-	sdata->deflink.u.mgd.last_cqm_event_signal = 0;
+	/* For MLD, handle CQM change on all the active links */
+	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+		struct ieee80211_link_data *link =
+			sdata_dereference(sdata->link[link_id], sdata);
 
-	/* tell the driver upon association, unless already associated */
-	if (sdata->u.mgd.associated &&
-	    sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)
-		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
-						  BSS_CHANGED_CQM);
+		ieee80211_set_cqm_rssi_link(sdata, link, 0, 0,
+					    rssi_low, rssi_high);
+	}
 
 	return 0;
 }