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

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Date:	Sun, 22 May 2011 11:37:59 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>, Jesse Gross <jesse@...ira.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, ebiederm@...ssion.com
Subject: Re: [patch net-next-2.6 v2] net: vlan: make non-hw-accel rx path
 similar to hw-accel

Sun, May 22, 2011 at 10:38:45AM CEST, xiaosuo@...il.com wrote:
>On Sun, May 22, 2011 at 2:29 PM, Jiri Pirko <jpirko@...hat.com> wrote:
>> 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.
>>
>
>For a transparent bridge with ports: eth0 and eth1, the vlan tags
>need to be preserved.

Yet they are - in skb->vlan_tci. I see no problem here. It's the same as
if the NIC does hw-untagging itself.

Jirka
>
>-- 
>Regards,
>Changli Gao(xiaosuo@...il.com)
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