From owner-freebsd-net@FreeBSD.ORG  Wed Oct 19 14:36:38 2011
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Date: Wed, 19 Oct 2011 10:36:36 -0400
Message-ID: <CAFMmRNxoJafz9kz66sQXVYcsvd-tr8wqkh_-BbfhHD8RqRygKA@mail.gmail.com>
From: Ryan Stone <rysto32@gmail.com>
To: Rozhuk.IM@gmail.com
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Cc: freebsd-net <freebsd-net@freebsd.org>
Subject: Re: ether_demux does not handle frames with embedded vlan tags
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2011/10/19  <rozhuk.im@gmail.com>:
> This may be a wrong configuration or QinQ: packet may have M_VLAN tag is
> set and still vlan-tagged (ether_type = VLAN)

It is not QinQ in my case.  The interface that the upper hook exports
is that you send it a valid ethernet frame and it passes that frame up
the stack.  A vlan-tagged frame is a valid frame so I don't see why it
should not be handled correctly.