RDS Quality Of Service

RDS Quality Of Service

RDS QoS is an extension of IB QoS to provide clients the ability to
segregate traffic flows and define policy to regulate them.
Internally, each traffic flow is represented by a connection with all of its
independent resources like that of a normal connection, and is
differentiated by service type. In other words, there can be multiple
connections between an IP pair and each supports a unique service type.
Service type (TOS) is user-defined and can be configured to satisfy certain
traffic requirements. For example, one service type may be configured for
high-priority low-latency traffic, another for low-priority high-bandwidth
traffic, and so on.

TOS is socket based. Client can set TOS on a socket via an IOCTL and must
do so before initiating any traffic. Once set, the TOS can not be changed.

        ioctl(fd, RDS_IOC_SET_TOS=1, (uint8_t *)<TOS ptr>)

All out-going traffic from the socket will be associated with its TOS.

Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Bang Nguyen <bang.nguyen@oracle.com>