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Date:	Sat, 16 Jul 2016 20:16:19 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH net] vlan: use a valid default mtu value for vlan over

From: Paolo Abeni <>
Date: Thu, 14 Jul 2016 18:00:10 +0200

> macsec can't cope with mtu frames which need vlan tag insertion, and
> vlan device set the default mtu equal to the underlying dev's one.
> By default vlan over macsec devices use invalid mtu, dropping
> all the large packets.
> This patch adds a netif helper to check if an upper vlan device
> needs mtu reduction. The helper is used during vlan devices
> initialization to set a valid default and during mtu updating to
> forbid invalid, too bit, mtu values.
> The helper currently only check if the lower dev is a macsec device,
> if we get more users, we need to update only the helper (possibly
> reserving an additional IFF bit).
> Signed-off-by: Paolo Abeni <>

Applied and queued up for -stable.

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