mac80211: count started vifs

count the started roles by simply counting the non-idle vifs.
(Based on Arik's patch from R5)

Signed-off-by: Eyal Shapira <eyal@wizery.com>

include/net/mac80211.h

@@ -4035,4 +4035,5 @@ void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif);
  */
 int ieee80211_ave_rssi(struct ieee80211_vif *vif);
 
+int ieee80211_started_vifs_count(struct ieee80211_hw *hw);
 #endif /* MAC80211_H */

net/mac80211/util.c

@@ -1990,3 +1990,28 @@ u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
 		return 2;
 	return 1;
 }
+
+int ieee80211_started_vifs_count(struct ieee80211_hw *hw)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct ieee80211_sub_if_data *sdata;
+	int count = 0;
+
+	rcu_read_lock();
+
+	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		if (!ieee80211_sdata_running(sdata))
+			continue;
+
+		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
+		    sdata->vif.type == NL80211_IFTYPE_MONITOR)
+			continue;
+
+		if (!sdata->vif.bss_conf.idle)
+			count++;
+	}
+
+	rcu_read_unlock();
+	return count;
+}
+EXPORT_SYMBOL(ieee80211_started_vifs_count);