Two Non-IBA Service Types
General
In addition to the four IBA service types (RC, UC, RD, and UD), there are two non-IBA service classes and their respective QP types:
Raw IPv6 (Internet Protocol Version 6) Datagram.
Raw EtherType Datagram.
They are referred to as encapsulation services because they permit a non-IBA packet (e.g., Ethernet or an IP packet) to be encapsulated in (i.e., placed within) an IBA packet so it can be tunneled through the IBA fabric towards its destination. Note that either encapsulation method may be used to transport IPv6 datagrams.
Raw datagrams are similar to UD except that the source QP doesn't know the identity of the QP that will receive the message (i.e., the request packet does not contain a DestQP field).
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