>
> Thanks for the reply Jason
>
> > > The RDMA stuff ignores everything in iptables.
> >
> > Can I ask why this is?
>
> roce is an incomplete emulation of the netstack with hardware
> offload. everything iptables is part of the incompleteness..
OK thanks
>> > 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'ss
>> not internal to one NIC but across two NICs in the same
>> server. Loopback inside one NIC works fine.
>
> I got that, but it makes no difference to my statement. Out of the box
> the kernel should select one of the two NICs and do internal loopback.
>
> That is consistent with the netstack semantic that the IP address is a
> property of the host not the netdev.
OK I see what you are saying. I do see this working on my setup in the sense that if I don’t use Parav’s loopback script I see rdma_cm based connections loopback back internally off one of the HCAs.
Stephen
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