[ewg] bug 1918 - openmpi broken due to rdma-cm changes

[Steve Wise]

The more I think about this, the more I conclude the rdma-cm is just 
broken.  There's no way to determine an RDMA device from 127.0.0.1, so 
how can bind succeed?


Steve Wise wrote:
> I just opened 1918.  The latest ofed-1.5.1 rdma-cm is allowing binds to 
> 127.0.0.1.  This is no-no for devices that don't support hw loopback...
>
> OpenMPI uses rdma_bind_addr() to figure out which ip addresses are valid 
> for which IB devices.   This logic is now broken.  Regardless of whether 
> OpenMPI should use another method for determining which IP address 
> belong to which interfaces, we should probably rethink whether we're 
> breaking rdma-cm semantics in a bad way on a point release.
>
>
> Steve.
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