BMCR_LOOPBACK      83 include/uapi/linux/mdio.h #define MDIO_PCS_CTRL1_LOOPBACK		BMCR_LOOPBACK
BMCR_LOOPBACK      84 include/uapi/linux/mdio.h #define MDIO_PHYXS_CTRL1_LOOPBACK	BMCR_LOOPBACK