Use the following option to provide QoS classification data:

IP_QOS_CLASSIFICATION (used with TCP applications)

This option enables the application to provide QoS classification data. It is a z/OS® Communications Server-specific ancillary data type, and is not associated with the IPv6 Advanced Socket API. It can be specified as ancillary data on sendmsg() for AF_INET and AF_INET6 sockets. For AF_INET sockets the level specified should be IPPROTO_IP; for AF_INET6 sockets the level specified should be IPPROTO_IPV6. For a detailed description of the function, see the programming interfaces in z/OS Communications Server: IP Programmer's Guide and Reference for providing classification data to be used in differentiated services policies.