[openib-general] [RFC][PATCH] rdma_cm: allow joins to return a unique address

[Andrew Friedley]

Sean Hefty wrote:
> Modify rdma_join_multicast to allow the user to specify that
> they want the underlying transport to assign them a unique
> multicast address.  This is done by specifying an IP address
> of 0, which will translate into an IB MGID of 0.
> 
> To allow others to join this group, we need a way to determine
> if additional join requests are for a specific MGID, or require
> IP to MGID mapping.  This is done by comparing the requested
> join address against SA assigned MGIDs.

Still not understanding this part -- this means that I'm not able to get 
some sort of portable handle for the group on the process that initially 
joins the group, and pass it to other processes who would then use that 
to join the group?

Andrew