AM65_CPSW_DSCP_PRI_PER_REG
reg_ofs = (dscp / AM65_CPSW_DSCP_PRI_PER_REG) * 4;
bit_ofs = AM65_CPSW_DSCP_PRI_SIZE * (dscp % AM65_CPSW_DSCP_PRI_PER_REG);