Symbol: MII_CR_LOOPBACK
usr/src/uts/common/io/e1000g/e1000g_main.c
5759
(void) e1000_write_phy_reg(hw, PHY_CONTROL, phy_ctrl | MII_CR_LOOPBACK);
usr/src/uts/common/io/igb/igb_main.c
3996
phy_ctrl = MII_CR_FULL_DUPLEX | MII_CR_SPEED_1000 | MII_CR_LOOPBACK;