QETH_HDR_EXT_CSUM_TRANSP_REQ
*flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ;
is_cso = hdr->hdr.l2.flags[1] & QETH_HDR_EXT_CSUM_TRANSP_REQ;
is_cso = hdr->hdr.l3.ext_flags & QETH_HDR_EXT_CSUM_TRANSP_REQ;