netdev - Re: VLAN packets silently dropped in promiscuous mode

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Message-ID: <AANLkTi=QAoVH9KU8FAH6iscWt_mKnZpU3P9QqgFRLqXM@mail.gmail.com>
Date:	Wed, 29 Sep 2010 10:44:26 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Roger Luethi <rl@...lgate.ch>
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>
Subject: Re: VLAN packets silently dropped in promiscuous mode

On Wed, Sep 29, 2010 at 4:37 AM, Roger Luethi <rl@...lgate.ch> wrote:
> I noticed packets for unknown VLANs getting silently dropped even in
> promiscuous mode (this is true only for the hardware accelerated path).
> netif_nit_deliver was introduced specifically to prevent that, but the
> function gets called only _after_ packets from unknown VLANs have been
> dropped.

Some drivers are fixing this on a case by case basis by disabling
hardware accelerated VLAN stripping when in promiscuous mode, i.e.:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5f6c01819979afbfec7e0b15fe52371b8eed87e8

However, at this point it is more or less random which drivers do
this.  It would obviously be much better if it were consistent.
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