nl80211/mac80211: Add retry and failed transmission count to station info

This information is already available in mac80211, we just need to export it
via cfg80211 and nl80211.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/nl80211.h

@@ -1137,6 +1137,8 @@ enum nl80211_rate_info {
  * @NL80211_STA_INFO_RX_PACKETS: total received packet (u32, from this station)
  * @NL80211_STA_INFO_TX_PACKETS: total transmitted packets (u32, to this
  *	station)
+ * @NL80211_STA_INFO_TX_RETRIES: total retries (u32, to this station)
+ * @NL80211_STA_INFO_TX_FAILED: total failed packets (u32, to this station)
  */
 enum nl80211_sta_info {
 	__NL80211_STA_INFO_INVALID,
@@ -1150,6 +1152,8 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_TX_BITRATE,
 	NL80211_STA_INFO_RX_PACKETS,
 	NL80211_STA_INFO_TX_PACKETS,
+	NL80211_STA_INFO_TX_RETRIES,
+	NL80211_STA_INFO_TX_FAILED,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,

include/net/cfg80211.h

@@ -401,6 +401,8 @@ struct station_parameters {
  *  (tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
  * @STATION_INFO_RX_PACKETS: @rx_packets filled
  * @STATION_INFO_TX_PACKETS: @tx_packets filled
+ * @STATION_INFO_TX_RETRIES: @tx_retries filled
+ * @STATION_INFO_TX_FAILED: @tx_failed filled
  */
 enum station_info_flags {
 	STATION_INFO_INACTIVE_TIME	= 1<<0,
@@ -413,6 +415,8 @@ enum station_info_flags {
 	STATION_INFO_TX_BITRATE		= 1<<7,
 	STATION_INFO_RX_PACKETS		= 1<<8,
 	STATION_INFO_TX_PACKETS		= 1<<9,
+	STATION_INFO_TX_RETRIES		= 1<<10,
+	STATION_INFO_TX_FAILED		= 1<<11,
 };
 
 /**
@@ -462,6 +466,8 @@ struct rate_info {
  * @txrate: current unicast bitrate to this station
  * @rx_packets: packets received from this station
  * @tx_packets: packets transmitted to this station
+ * @tx_retries: cumulative retry counts
+ * @tx_failed: number of failed transmissions (retries exceeded, no ACK)
  * @generation: generation number for nl80211 dumps.
  *	This number should increase every time the list of stations
  *	changes, i.e. when a station is added or removed, so that
@@ -479,6 +485,8 @@ struct station_info {
 	struct rate_info txrate;
 	u32 rx_packets;
 	u32 tx_packets;
+	u32 tx_retries;
+	u32 tx_failed;
 
 	int generation;
 };

net/mac80211/cfg.c

@@ -327,6 +327,8 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 			STATION_INFO_TX_BYTES |
 			STATION_INFO_RX_PACKETS |
 			STATION_INFO_TX_PACKETS |
+			STATION_INFO_TX_RETRIES |
+			STATION_INFO_TX_FAILED |
 			STATION_INFO_TX_BITRATE;
 
 	sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
@@ -334,6 +336,8 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 	sinfo->tx_bytes = sta->tx_bytes;
 	sinfo->rx_packets = sta->rx_packets;
 	sinfo->tx_packets = sta->tx_packets;
+	sinfo->tx_retries = sta->tx_retry_count;
+	sinfo->tx_failed = sta->tx_retry_failed;
 
 	if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||
 	    (sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {

net/wireless/nl80211.c

@@ -1890,6 +1890,12 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
 	if (sinfo->filled & STATION_INFO_TX_PACKETS)
 		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_PACKETS,
 			    sinfo->tx_packets);
+	if (sinfo->filled & STATION_INFO_TX_RETRIES)
+		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_RETRIES,
+			    sinfo->tx_retries);
+	if (sinfo->filled & STATION_INFO_TX_FAILED)
+		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_FAILED,
+			    sinfo->tx_failed);
 	nla_nest_end(msg, sinfoattr);
 
 	return genlmsg_end(msg, hdr);