eth_sgl_or_raw_data
union eth_sgl_or_raw_data sgl_or_raw_data /* union for sgl and raw data. */;
union eth_sgl_or_raw_data sgl_or_raw_data /* union for sgl and raw data. */;
union eth_sgl_or_raw_data sgl_or_raw_data; // currently used by OOO_CID. upper layer should handle endianity!