[openib-general] IB mcast question

[Hal Rosenstock]

On Tue, 2006-08-15 at 12:58, Sean Hefty wrote:
> >The qkeys used by the RDMA CM sound like they may be the problem.  I'll verify
> >this and see how to fix it if so.
> 
> If I set the qkeys for the QPs and MCMemberRecord to 0, I can get this to work
> now.  The RDMA CM uses a qkey = port number for UD QPs, and a qkey = IPv4
> address for MCMemberRecords.
> 
> 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.

-- Hal

> 
> - Sean
> 
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