netdev - Re: [PATCH 1/3] vlan: Do not support clearing VLAN_FLAG_REORDER

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Message-Id: <20110524.011942.393855175233217324.davem@davemloft.net>
Date:	Tue, 24 May 2011 01:19:42 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	shemminger@...ux-foundation.org, greearb@...delatech.com,
	nicolas.2p.debian@...il.com, jpirko@...hat.com, xiaosuo@...il.com,
	netdev@...r.kernel.org, kaber@...sh.net, fubar@...ibm.com,
	eric.dumazet@...il.com, andy@...yhouse.net, jesse@...ira.com
Subject: Re: [PATCH 1/3] vlan: Do not support clearing VLAN_FLAG_REORDER_HDR

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Mon, 23 May 2011 15:05:54 -0700

> 3) What do we do with pf_packet and vlan hardware acceleration when
>    dumping not the vlan interface but the interface below the vlan
>    interface?
> 
>    Do we provide an option to keep the vlan header?  Should that option
>    be on by default?
> 

The vlan_tci in the V2 pf_packet auxdata was intended for this
purpose.

So no matter what variant of behavior is occurring, apps can properly
reconstitute the VLAN header if they inspect the vlan_tci in the
auxdata.

The only thing that seems to be missing is an indication that a VLAN
tag was present at all, ie. vlan_tx_tag_present(), in this manner an
application could then differentiate between no VLAN header and a VLAN
tag of zero.
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