netdev - Re: [net PATCH] ip_vti/ip6_vti: Clear skb->mark when resetting skb->dev in receive path

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Message-ID: <20150518085908.GA18381@gondor.apana.org.au>
Date:	Mon, 18 May 2015 16:59:08 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	David Miller <davem@...emloft.net>, alexander.duyck@...il.com,
	alexander.h.duyck@...hat.com, netdev@...r.kernel.org, tgraf@...g.ch
Subject: Re: [net PATCH] ip_vti/ip6_vti: Clear skb->mark when resetting
 skb->dev in receive path

On Mon, May 18, 2015 at 10:38:44AM +0200, Steffen Klassert wrote:
> 
> Yes, that's possible. We just did not restore it because it 
> was cleared with skb_scrub_packet() right after the lookup.

OK I think we can still salvage this if we do the following:

1) Restore the mark after the lookup so the effect is minimised.
2) Create new flow lookup field for this.
3) Create tunnel flag that indicates new field should be used.
4) Deprecate the use of skb->mark by vti.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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