# arg1: port ifname, ex: eth0
get_max_port_speed() {
	if [ -z "$1" ]; then
		echo 0
		return
	fi

	local ifname="$1"
	local phycap="$(ethtool $ifname | grep -A 10 "Supported link modes" | grep 00 | tail -n 1 | awk '{print$NF}')"
	local speed=1000

	case "$phycap" in
		10000*) speed=10000 ;;
		5000*) speed=5000 ;;
		2500*) speed=2500 ;;
		1000*) speed=1000 ;;
		100*) speed=100 ;;
		10*) speed=10 ;;
	esac

	echo $speed
}

# arg1: port ifname, ex: eth0
# arg2: port enabled, ex: 1
power_updown() {
	local ifname="$1"
	local enabled=$2

	local updown="up"
	[ $enabled -eq 0 ] && updown="down"
	ip link set dev $ifname $updown
}

# arg1: port ifname, ex: eth0
# arg2: port enabled, ex: 1
# arg3: port speed, ex: 1000
# arg4: port duplex, ex: full
# arg5: port autoneg, ex: on
# arg6: port eee, ex: 0
# arg7: port pause, ex: 0
set_port_settings() {
	local ifname="$1"
	local enabled=$2
	local speed="$3"
	local duplex=$4
	local autoneg=$5
	local eee=$6
	local pause=$7

	[ -d /sys/class/net/$ifname ] || return

	[ $autoneg -eq 1 ] && autoneg="on" || autoneg="off"
	ethtool --change $ifname speed $speed duplex $duplex autoneg $autoneg

	[ $eee -eq 1 ] && eee="on" || eee="off"
	ethtool --set-eee $ifname eee $eee 2>/dev/null

	case $pause in
		off|0)
			pause=0x0
			auto=off
			rx=off
			tx=off
		;;
		on|1)
			pause=0x2
			auto=off
			rx=on
			tx=on
		;;
		auto)
			pause=0x1
			auto=on
			rx=on
			tx=on
		;;
		tx)
			pause=0x3
			auto=off
			rx=off
			tx=on
		;;
		rx)
			pause=0x4
			auto=off
			rx=on
			tx=off
		;;
	esac

	ethtool --pause $ifname autoneg $auto rx $rx tx $tx 2>/dev/null

	power_updown $ifname $enabled
}