netdev - Re: Increasing skb->mark size

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Message-ID: <1448398614.14854.39.camel@mattb-dl>
Date:	Tue, 24 Nov 2015 20:56:54 +0000
From:	Matt Bennett <Matt.Bennett@...iedtelesis.co.nz>
To:	"fw@...len.de" <fw@...len.de>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Luuk Paulussen <Luuk.Paulussen@...iedtelesis.co.nz>,
	Kyeong Yoo <Kyeong.Yoo@...iedtelesis.co.nz>
Subject: Re: Increasing skb->mark size

On Tue, 2015-11-24 at 21:36 +0100, Florian Westphal wrote:
> Matt Bennett <Matt.Bennett@...iedtelesis.co.nz> wrote:
> > I'm emailing this list for feedback on the feasibility of increasing
> > skb->mark or adding a new field for marking. Perhaps this extension
> > could be done under a new CONFIG option. Perhaps there are other ways we
> > could achieve the desired behaviour?
> 
> Well I pointed you towards connlabels which provide 128 bit of space
> in the conntrack extension area but you did not tell me why you cannot
> use it.
Sorry, I moved the discussion to this list to hopefully gather some new
ideas/opinions.

While connlabels provide 128bits of space skb->mark is still only 32
bits. Since we are using connection tracking to simply restore skb->mark
the use of connlabels by itself doesn't solve the problem I outlined
above. skb->mark would still needs to be increased in size.
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