RB_ENA_OP_MD
skge_write8(hw, RB_ADDR(q, RB_CTRL), RB_ENA_OP_MD);
sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_ENA_OP_MD);
sky2_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);