[openib-general] [Fwd: RE: IB mcast question]

[Roland Dreier]

 > This is what I was referring to.  I'm really not familiar with IP multicast
 > beyond what I read in a book while coding the RDMA CM.  It sounds like we might
 > be able to use the QKey as the port number for the QP to mimic the behavior.

I don't see how this could work-- to mimic IP, an app has to be able
to multicast a datagram to multiple destination ports using the same
multicast group.  Since IB multicast groups have a Q_Key associated,
the only way this could work is if all QPs and MCGs share one Q_Key.