netdev - Re: [PATCH v2 net] net: Always untag vlan-tagged traffic on input.

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Message-ID: <20140929130543.GB1839@nanopsycho.orion>
Date:	Mon, 29 Sep 2014 15:05:43 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	Vladislav Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	Nithin Nayak Sujir <nsujir@...adcom.com>,
	Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH v2 net] net: Always untag vlan-tagged traffic on input.

Mon, Sep 29, 2014 at 02:44:57PM CEST, nicolas.dichtel@...nd.com wrote:
>Le 08/08/2014 20:42, Vladislav Yasevich a écrit :
>[snip]
>>
>>The patch attempt to fix this another way.  It moves the vlan header
>>stipping code out of the vlan module and always builds it into the
>>kernel network core.  This way, even if vlan is not supported on
>>a virtualizatoin host, the virtual machines running on top of such
>>host will still work with VLANs enabled.
>After this patch (0d5501c1c828 ("net: Always untag vlan-tagged traffic on
>input.")), tcpdump will not be able to display the VLAN header on input path.
>Is this really intended?

I assume you are talking about the case when CONFIG_VLAN_8021Q is "n"
right? Because if it is "m" of "y" I see no change in the code.

In case of CONFIG_VLAN_8021Q is "n" the only change is that for
non-accelerated path, skb->vlan_tci is set and vlan header is stripped.
This makes the path same to accelerated path.

tcpdump should be able to cope with skb->vlan_tci

>
>
>Regards,
>Nicolas
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