E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP
extcnf_ctrl |= E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP;
if (extcnf_ctrl & E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP)
E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP;