RX_MFF_CTRL2
skge_write8(hw, SK_REG(port, RX_MFF_CTRL2), MFF_RST_CLR);
skge_write8(hw, SK_REG(port, RX_MFF_CTRL2), MFF_ENA_OP_MD);
skge_write8(hw, SK_REG(port, RX_MFF_CTRL2), MFF_RST_SET);
skge_write16(hw, RX_MFF_CTRL2, MFF_CLR_INSTAT);