[openib-general] mapping between IP address and device name

[Roland Dreier]

    Thomas> As I said - I am not attached to ATS. I would welcome an
    Thomas> alternative.

Sure, understood.  I'm suggesting a slight tweak to the IB wire
protocol.  I don't think there's a difference in the security
provided, and carrying the peer address in the CM private data avoids
a lot of the conceptual and implementation difficulties of ATS.

    Thomas> But in the absence of one, I like what we have. Also, I do
    Thomas> not want to saddle the NFS/RDMA transport with carrying an
    Thomas> IP address purely for the benefit of a missing transport
    Thomas> facility. After all NFS/RDMA works on iWARP too.

I'm not sure I understand this objection.  We wouldn't be saddling the
transport with anything -- simply specifying in the binding of
NFS/RDMA to IB that certain information is carried in the private data
fields of the CM messages used to establish a connection.  Clearly
iWARP would use its own mechanism for providing the peer address.

This would be exactly analogous to the situation for SDP -- obviously
SDP running on iWARP does not use the IB CM to exchange IP address
information in the same way the SDP over IB does.

 - R.