netdev - Re: [PATCH] ucc_geth: Add 8 bytes to max TX frame for VLANs

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Message-ID:  <m37ify1ipk.fsf@ursa.amorsen.dk>
Date:	Wed, 19 Mar 2008 22:56:23 +0100
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	netdev@...r.kernel.org
Subject:  Re: [PATCH] ucc_geth: Add 8 bytes to max TX frame for VLANs

Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se> writes:

> Creating a VLAN interface on top of ucc_geth adds 4 bytes
> to the frame and the HW controller is not prepared to
> TX a frame bigger than 1518 bytes which is 4 bytes too
> small for a full VLAN frame. Also add 4 extra bytes for future
> expansion.

What about QinQ -- the 4 extra bytes handle that? If the limit can be
raised so easily, why have a static limit at all?


/Benny


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