[openib-general] RFC multicast support

[Steve Wise]

>
> The CMA API came as reasonably close as I could make it to providing 
> socket-like
> semantics.  One of the intents here is to provide an API that feels 
> familiar to
> what people are used to using.  I was trying to allow applications to 
> define
> multicast groups using IP addresses, as opposed to GIDs directly.  My
> understanding is that MPI will use both connected and multicast QPs 
> for
> communication; I wanted to provide a somewhat consistent addressing 
> model.
>

IMO this is a good reason to do the work.