linux-kernel - Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode

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Date:	Tue, 13 Nov 2007 03:36:11 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	kaber@...sh.net, joonwpark81@...il.com, w@....eu,
	cfriesen@...tel.com, auke-jan.h.kok@...el.com,
	netdev@...r.kernel.org,
	djohnson+linux-kernel@...starentnetworks.com,
	linux-kernel@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when
 promiscuous mode

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 13 Nov 2007 19:09:23 +0800

> I agree.  People doing a tcpdump don't have to turn on promiscuous
> mode, that's what the -p option is for.  In other words, having
> promiscuous mode disable VLAN filtering does not take away the
> user's options at all.
> 
> In fact, the very definition of promiscuous is to turn off hardware
> filtering, albeit the filtering of MAC addresses rather than VLAN
> tags.  So it would seem logical to have it turn off VLAN filtering
> too.

Ok.

The performance implications can be pretty severe however.
I wish we could address this somehow.

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