netdev - Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header

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Date:   Tue, 11 Oct 2016 19:37:32 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard
 header

On Tue, 2016-10-11 at 11:32 -0600, Jason Gunthorpe wrote:
> On Tue, Oct 11, 2016 at 07:15:44PM +0200, Paolo Abeni wrote:
> 
> > Also the connected mode maximum mtu is reduced by 16 bytes to
> > cope with the increased hard header len.
> 
> Changing the MTU is going to cause annoying interop problems, can you
> avoid this?

I don't like changing the maximum MTU value, too, but I was unable to
find an alternative solution. The PMTU detection should protect against
such issues.