[ewg] [PATCH] [for-2.6.33] rdma/cm: disallow loopback address for iwarp devices

[Sean Hefty]

>IMO 127.0.0.1 should be for SW loopback, not HW RDMA loopback.

I disagree, but what does it matter?  So, we add a 'software' loopback that uses
127.0.0.1.  Openmpi still wouldn't work.

>I will commit to get the fix in openmpi asap.

If we don't care if the fix is in the kernel or user space, then we could add an
a 'disable-loopback-support' build option to librdmacm, which can fail any
attempt to bind to a loopback address.