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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L3416: 	ETHTOOL_LINK_EXT_SUBSTATE_AN_ACK_NOT_RECEIVED                           = 0x2