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

On Tue, 2016-10-11 at 11:42 -0600, Jason Gunthorpe wrote:

On Tue, Oct 11, 2016 at 07:37:32PM +0200, Paolo Abeni wrote:

quoted

On Tue, 2016-10-11 at 11:32 -0600, Jason Gunthorpe wrote:

quoted

On Tue, Oct 11, 2016 at 07:15:44PM +0200, Paolo Abeni wrote:

quoted

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.

It is more that PMTU, we have instructed all users that is the MTU
number needed to enable CM mode, so it appears in documentation,
scripts, etc.

AFAICS the max mtu is already underlying h/w dependent, how does such
differences are currently coped by ? (I'm sorry I lack some/a lot of IB
back-ground)

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