From: Roland Dreier <rol...@kernel.org>
Date: Mon, 6 Feb 2012 09:23:58 -0800

> IMHO the problem is in the IPoIB RFC: (4391) which makes
> a distinction between an "encapsulation header" and the "link
> layer address".  The LL address is what we put into ARP and
> ND packets, and so I think we are forced into exposing that
> to the network stack as our hardware address.

An address is not a hardware MAC header, we're only talking
about the length of the latter.

If the addressing is such that you need to put the GID
into the ARP/NDISC packets, and that's different from what
ends up in the final encapsulation header, I really don't
see what the problem is specificially with respect to the
MAC header size.
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