mac80211: move beacon_loss_count into ifmgd

There's little point in keeping (and even sending to userspace)
the beacon_loss_count value per station, since it can only apply
to the AP on a managed-mode connection. Move the value to ifmgd,
advertise it only in managed mode, and remove it from ethtool as
it's available through better interfaces.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ethtool.c

@@ -40,7 +40,7 @@ static const char ieee80211_gstrings_sta_stats[][ETH_GSTRING_LEN] = {
 	"rx_duplicates", "rx_fragments", "rx_dropped",
 	"tx_packets", "tx_bytes",
 	"tx_filtered", "tx_retry_failed", "tx_retries",
-	"beacon_loss", "sta_state", "txrate", "rxrate", "signal",
+	"sta_state", "txrate", "rxrate", "signal",
 	"channel", "noise", "ch_time", "ch_time_busy",
 	"ch_time_ext_busy", "ch_time_rx", "ch_time_tx"
 };
@@ -90,7 +90,6 @@ static void ieee80211_get_stats(struct net_device *dev,
 		data[i++] += sta->tx_filtered_count;	\
 		data[i++] += sta->tx_retry_failed;	\
 		data[i++] += sta->tx_retry_count;	\
-		data[i++] += sta->beacon_loss_count;	\
 	} while (0)
 
 	/* For Managed stations, find the single station based on BSSID

net/mac80211/ieee80211_i.h

@@ -503,6 +503,9 @@ struct ieee80211_if_managed {
 	 */
 	unsigned int count_beacon_signal;
 
+	/* Number of times beacon loss was invoked. */
+	unsigned int beacon_loss_count;
+
 	/*
 	 * Last Beacon frame signal strength average (ave_beacon_signal / 16)
 	 * that triggered a cqm event. 0 indicates that no event has been

net/mac80211/mlme.c

@@ -2420,15 +2420,9 @@ static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 		container_of(work, struct ieee80211_sub_if_data,
 			     u.mgd.beacon_connection_loss_work);
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
-	struct sta_info *sta;
 
-	if (ifmgd->associated) {
-		rcu_read_lock();
-		sta = sta_info_get(sdata, ifmgd->bssid);
-		if (sta)
-			sta->beacon_loss_count++;
-		rcu_read_unlock();
-	}
+	if (ifmgd->associated)
+		ifmgd->beacon_loss_count++;
 
 	if (ifmgd->connection_loss) {
 		sdata_info(sdata, "Connection to AP %pM lost\n",

net/mac80211/sta_info.c

@@ -1871,8 +1871,12 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 			 BIT(NL80211_STA_INFO_STA_FLAGS) |
 			 BIT(NL80211_STA_INFO_BSS_PARAM) |
 			 BIT(NL80211_STA_INFO_CONNECTED_TIME) |
-			 BIT(NL80211_STA_INFO_RX_DROP_MISC) |
-			 BIT(NL80211_STA_INFO_BEACON_LOSS);
+			 BIT(NL80211_STA_INFO_RX_DROP_MISC);
+
+	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+		sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
+		sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
+	}
 
 	sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
 	sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
@@ -1914,7 +1918,6 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 	}
 
 	sinfo->rx_dropped_misc = sta->rx_dropped;
-	sinfo->beacon_loss_count = sta->beacon_loss_count;
 
 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 	    !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {

net/mac80211/sta_info.h

@@ -508,7 +508,6 @@ struct sta_info {
 	enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
 
 	unsigned int lost_packets;
-	unsigned int beacon_loss_count;
 
 	enum ieee80211_smps_mode known_smps_mode;
 	const struct ieee80211_cipher_scheme *cipher_scheme;