DS_SNMP_MINOR_SHIFT
if (sp->req_id == (((uint64_t)1 << DS_SNMP_MINOR_SHIFT) - 1))
hdr.seq_num = ((uint64_t)minor << DS_SNMP_MINOR_SHIFT) | sp->req_id;
minor = (int)(hdr.seq_num >> DS_SNMP_MINOR_SHIFT);