Re: [linux-rdma and rdma-core]: Unable to perform rdma_connect in loopbacked configuration

["Stephen Bates" <sbates-pv7U853sEMVWk0Htik3J/w@public.gmane.org>]

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>> Using a NAT approach discussed in [1] I can setup IPv4 addresses on
>> both HCAs such that I avoid a local loopback (the addresses I use
>> are a little different to the ones in that reference but the
>> approach is identical). This allows ping, iperf and other IP based
>> applications to work just fine. For example:

Thanks for the reply Jason

> The RDMA stuff ignores everything in iptables.

Can I ask why this is?

> IIRC, you need to make 'ip route get blah' not return lo. This is done
> with some combination of policy routing and sysfs tweaking.

OK I think what Parav sent me aligns to that. I will test it and see if it works.

> IMHO, it is also a bug if loopback roce doesn't just work out of the
> box, fully internally to the NIC. :\

OK. Note what I am trying to get working is a bit different. It’s not internal to one
NIC but across two NICs in the same server. Loopback inside one NIC works fine.



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