mac80211: Add support for NL80211_STA_INFO_AIRTIME_LINK_METRIC

Add support for mesh airtime link metric attribute
NL80211_STA_INFO_AIRTIME_LINK_METRIC.
Signed-off-by: Narayanraddi Masti <team.nmasti@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -1327,6 +1327,7 @@ struct cfg80211_tid_stats {
  * @fcs_err_count: number of packets (MPDUs) received from this station with
  *	an FCS error. This counter should be incremented only when TA of the
  *	received packet with an FCS error matches the peer MAC address.
+ * @airtime_link_metric: mesh airtime link metric.
  */
 struct station_info {
 	u64 filled;
@@ -1381,6 +1382,8 @@ struct station_info {
 
 	u32 rx_mpdu_count;
 	u32 fcs_err_count;
+
+	u32 airtime_link_metric;
 };
 
 #if IS_ENABLED(CONFIG_CFG80211)

include/uapi/linux/nl80211.h

@@ -3139,6 +3139,7 @@ enum nl80211_sta_bss_param {
  * @NL80211_STA_INFO_TX_DURATION: aggregate PPDU duration for all frames
  *	sent to the station (u64, usec)
  * @NL80211_STA_INFO_AIRTIME_WEIGHT: current airtime weight for station (u16)
+ * @NL80211_STA_INFO_AIRTIME_LINK_METRIC: airtime link metric for mesh station
  * @__NL80211_STA_INFO_AFTER_LAST: internal
  * @NL80211_STA_INFO_MAX: highest possible station info attribute
  */
@@ -3184,6 +3185,7 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_CONNECTED_TO_GATE,
 	NL80211_STA_INFO_TX_DURATION,
 	NL80211_STA_INFO_AIRTIME_WEIGHT,
+	NL80211_STA_INFO_AIRTIME_LINK_METRIC,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,

net/mac80211/mesh.h

@@ -278,6 +278,8 @@ mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);
 int mesh_path_add_gate(struct mesh_path *mpath);
 int mesh_path_send_to_gates(struct mesh_path *mpath);
 int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
+u32 airtime_link_metric_get(struct ieee80211_local *local,
+			    struct sta_info *sta);
 
 /* Mesh plinks */
 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,

net/mac80211/mesh_hwmp.c

@@ -318,8 +318,8 @@ void ieee80211s_update_metric(struct ieee80211_local *local,
 				  cfg80211_calculate_bitrate(&rinfo));
 }
 
-static u32 airtime_link_metric_get(struct ieee80211_local *local,
-				   struct sta_info *sta)
+u32 airtime_link_metric_get(struct ieee80211_local *local,
+			    struct sta_info *sta)
 {
 	/* This should be adjusted for each device */
 	int device_constant = 1 << ARITH_SHIFT;

net/mac80211/sta_info.c

@@ -2373,6 +2373,12 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
 		sinfo->filled |=
 			BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG);
 	}
+
+	if (ieee80211_vif_is_mesh(&sdata->vif)) {
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_LINK_METRIC);
+		sinfo->airtime_link_metric =
+			airtime_link_metric_get(local, sta);
+	}
 }
 
 u32 sta_get_expected_throughput(struct sta_info *sta)

net/wireless/nl80211.c

@@ -4898,6 +4898,7 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
 	PUT_SINFO(TX_RETRIES, tx_retries, u32);
 	PUT_SINFO(TX_FAILED, tx_failed, u32);
 	PUT_SINFO(EXPECTED_THROUGHPUT, expected_throughput, u32);
+	PUT_SINFO(AIRTIME_LINK_METRIC, airtime_link_metric, u32);
 	PUT_SINFO(BEACON_LOSS, beacon_loss_count, u32);
 	PUT_SINFO(LOCAL_PM, local_pm, u32);
 	PUT_SINFO(PEER_PM, peer_pm, u32);