[openib-general] IB mcast question

[Hal Rosenstock]

On Tue, 2006-08-15 at 14:18, Sean Hefty wrote:
> >> A potential fix I see for this is to use the same qkey for all UD QPs and
> >> multicast groups created by the RDMA CM.  Otherwise we restrict UD QPs to
> >using
> >> a single destination (remote UD QP or multicast group.)
> >
> >Doesn't the QKey need to be the same as the one used for the IPoIB
> >broadcast group (for the partition in question) per IPoIB RFC ? It
> >should also be the one returned in the SA MCMemberRecord response.
> 
> It shouldn't.  The RDMA CM multicast groups are separate from those used by
> ipoib.

Is the IP address only used locally to construct the MGID ? What does
the MGID look like ? What signature does it use if any ?

-- Hal

> - Sean