hostapd: Add last_ack_rssi into ctrl iface cmd STA

This allows external application to get last ACK signal strength of the
last transmitted frame if the driver makes this information
(NL80211_STA_INFO_ACK_SIGNAL) available.

Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>

src/ap/ctrl_iface_ap.c

@@ -153,6 +153,13 @@ static int hostapd_get_sta_tx_rx(struct hostapd_data *hapd,
 						   supported_mcs_set);
 	}
 
+	if (data.flags & STA_DRV_DATA_LAST_ACK_RSSI) {
+		ret = os_snprintf(buf + len, buflen - len,
+				  "last_ack_signal=%d\n", data.last_ack_rssi);
+		if (!os_snprintf_error(buflen - len, ret))
+			len += ret;
+	}
+
 	return len;
 }
 

src/drivers/driver.h

@@ -1694,6 +1694,7 @@ struct hostapd_data;
 #define STA_DRV_DATA_RX_VHT_NSS BIT(5)
 #define STA_DRV_DATA_TX_SHORT_GI BIT(6)
 #define STA_DRV_DATA_RX_SHORT_GI BIT(7)
+#define STA_DRV_DATA_LAST_ACK_RSSI BIT(8)
 
 struct hostap_sta_driver_data {
 	unsigned long rx_packets, tx_packets;
@@ -1706,8 +1707,7 @@ struct hostap_sta_driver_data {
 	unsigned long num_ps_buf_frames;
 	unsigned long tx_retry_failed;
 	unsigned long tx_retry_count;
-	int last_rssi;
-	int last_ack_rssi;
+	s8 last_ack_rssi;
 	s8 signal;
 	u8 rx_vhtmcs;
 	u8 tx_vhtmcs;

src/drivers/driver_nl80211.c

@@ -6049,6 +6049,7 @@ static int get_sta_handler(struct nl_msg *msg, void *arg)
 		[NL80211_STA_INFO_RX_BYTES64] = { .type = NLA_U64 },
 		[NL80211_STA_INFO_TX_BYTES64] = { .type = NLA_U64 },
 		[NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
+		[NL80211_STA_INFO_ACK_SIGNAL] = { .type = NLA_U8 },
 	};
 	struct nlattr *rate[NL80211_RATE_INFO_MAX + 1];
 	static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
@@ -6111,6 +6112,11 @@ static int get_sta_handler(struct nl_msg *msg, void *arg)
 			nla_get_u32(stats[NL80211_STA_INFO_TX_FAILED]);
 	if (stats[NL80211_STA_INFO_SIGNAL])
 		data->signal = nla_get_u8(stats[NL80211_STA_INFO_SIGNAL]);
+	if (stats[NL80211_STA_INFO_ACK_SIGNAL]) {
+		data->last_ack_rssi =
+			nla_get_u8(stats[NL80211_STA_INFO_ACK_SIGNAL]);
+		data->flags |= STA_DRV_DATA_LAST_ACK_RSSI;
+	}
 
 	if (stats[NL80211_STA_INFO_TX_BITRATE] &&
 	    nla_parse_nested(rate, NL80211_RATE_INFO_MAX,