netdev - Re: [patch net-next-2.6 v2] net: vlan: make non-hw-accel rx path similar to hw-accel

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Message-ID: <BANLkTi=4JJa-J-p_JbY1PfooT75KfSB4uA@mail.gmail.com>
Date:	Sun, 22 May 2011 09:11:01 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jiri Pirko <jpirko@...hat.com>,
	Nicolas de Pesloüan <nicolas.2p.debian@...il.com>,
	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	shemminger@...ux-foundation.org, kaber@...sh.net, fubar@...ibm.com,
	eric.dumazet@...il.com, andy@...yhouse.net
Subject: Re: [patch net-next-2.6 v2] net: vlan: make non-hw-accel rx path
 similar to hw-accel

On Sat, May 21, 2011 at 11:34 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Jiri Pirko <jpirko@...hat.com> writes:
>
>> Sun, May 22, 2011 at 04:59:49AM CEST, nicolas.2p.debian@...il.com wrote:
>>
>> <snip>
>>>
>>>And because some setups may still require the skb not to be untagged,
>>>may be we need the ability to re-tag the skb in some situations...
>>>When a protocol handler or rx_handler is explicitly registered on a
>>>net_device which expect to receive tagged skb, we should deliver
>>>tagged skb to it... Arguably, this may sound incredible for the
>>>general case, but may be required for not-so-special cases like
>>>bridge or protocol analyzer.
>>
>> Wait, what setups/code require the skb not to be untagged? If there's
>> such, it should be fixed.
>
> tcpdump on the non-vlan interface for one.

There are some drivers still using the old vlan model that will drop
tags or packets when no vlan group is configured but that's a driver
problem, not one with networking core or tcpdump.
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