Re: failure to get gid with rdma_bind_addr with >= 3.10 kernels

[Yann Droneaud <ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org>]

Le jeudi 02 janvier 2014 à 16:33 +0000, Hefty, Sean a écrit :
> > After reading quickly the thread, I still believe that's sound like a
> > kernel regression which broke existing userspace applications.
> > 
> > So a patch must be applied on the kernel to fix that regression.
> 
> When AF_IB was added to the kernel, corresponding changes were added to the librdmacm.
> Those changes to the librdmacm are the cause of the issue.
> 

I was missing this part, the original message was misleading for me.

So it's the combination of librdmacm >= 1.0.17 and kernel >= 3.10+ which
is affected by the problem reported.

> The kernel rdma cm previously supported a single 'query' call. 
> With AF_IB, it supports the original call, plus 3 additional calls.
> The problem is the librdmacm using the newer query calls.
>  
> > Introducing AF_IB must not have changed the behavor for existing
> > applications. Existing applications must not need a new librdmacm when
> > they don't use newer kernel extensions.
> 
> An older version of the librdmacm that does NOT support AF_IB should work fine.
> 

Thanks for clarifying this for me.

Regards.

-- 
Yann Droneaud
OPTEYA


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