netdev - Re: Increasing skb->mark size

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Date:	Tue, 1 Dec 2015 21:42:45 -0800
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Daniel Borkmann <daniel@...earbox.net>
Cc:	Lorenzo Colitti <lorenzo@...gle.com>,
	Matt Bennett <Matt.Bennett@...iedtelesis.co.nz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Luuk Paulussen <Luuk.Paulussen@...iedtelesis.co.nz>,
	davem@...emloft.net
Subject: Re: Increasing skb->mark size

On 12/1/15 6:58 PM, Andi Kleen wrote:
>>> - skb_iff is either skb->dev->iff or 0. so it could be replaced with a
>>> single bit flag for the 0 case.
>>
>> ... and that one wouldn't work on ingress.
>
> Please explain.

skb->dev is dropped fairly early in the Rx path. skb_iif is needed for 
example for IP_CMSG_PKTINFO.

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