autocore: maximize ring buffer size for Intel IGC ethernet

Signed-off-by: Nicholas Sun <nicholas-sun@outlook.com>
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

package/emortal/autocore/files/autocore

@@ -22,7 +22,7 @@ start() {
 	uci set network.@globals[0].packet_steering="1"
 	uci commit network
 
-	for i in $(ip address | awk -F ': ' '/eth[0-9]+/ {print $2}' | xargs)
+	for i in $(ip address | awk -F ': ' '/eth[0-9]+/ {print $2}' | grep -v '@' | xargs)
 	do
 		{
 			ethtool -K "$i" rx-checksum on
@@ -34,6 +34,11 @@ start() {
 			ethtool -K "$i" gso on
 			ethtool -K "$i" tso on
 			ethtool -K "$i" ufo on
+
+			if ethtool -i "$i" | grep -q "driver: igc"; then
+				ethtool -G "$i" rx "$(ethtool -g "$i" | awk '/^RX:/ {print $2; exit}')"
+				ethtool -G "$i" tx "$(ethtool -g "$i" | awk '/^TX:/ {print $2; exit}')"
+			fi
 		}
 	done
 } >"/dev/null" 2>&1