linux-kernel - Re: [E1000-devel] [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode

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Date:	Mon, 12 Nov 2007 10:01:49 -0800
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	'Dave Johnson' <djohnson+linux-kernel@...starentnetworks.com>,
	linux-kernel@...r.kernel.org, Joonwoo Park <joonwpark81@...il.com>,
	'David Miller' <davem@...emloft.net>
Subject: Re: [E1000-devel] [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel
 when promiscuous mode

Patrick McHardy wrote:
> Kok, Auke wrote:
>> Joonwoo Park wrote:
>>> IMHO even though netdevice is in the promiscuous mode, we should receive all of ingress packets.
>>> This disable the vlan filtering feature when a vlan hw accel configured e1000 device goes into promiscuous mode.
>>> This make packets visible to sniffers though it's not vlan id of itself.
>>> Any check, comments will be appreciated.
>> Actually I think this patch removes a choice from the user.
>>
>> Before this patch, the user can sniff all traffic by disabling vlans, or a
>> specific vlan only by leaving vlans on when going into promisc mode.
>>
>> After this patch, the user has no choice but to sniff all vlans at all times.
>>
>> I don't think that that is such a good improvement.
> 
> 
> Do you really consider that a realistic choice? Who is going to
> remove interfaces that are in use just to see traffic for other
> VLANs? Sniffing specific VLANs can always be done on the VLAN
> device itself.

right, I had not thought of that.

> IMO its more a question of what we want promiscous mode to mean,
> and I tend to agree with Joonwoo that it should receive all packets.

OK, Joonwoo: can you submit a patch against e1000e as well?

Auke
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