const golang.org/x/sys/unix.ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L3508: 	ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT                        = 0x40