netdev - Re: [RFC net-next] ipv6: Use destination address determined by IPVS

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Date:	Tue, 15 Oct 2013 19:40:59 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	YOSHIFUJI Hideaki /
	 吉藤英明 
	<yoshfuji@...ux-ipv6.org>, lvs-devel@...r.kernel.org,
	netdev@...r.kernel.org, Julian Anastasov <ja@....bg>,
	Mark Brooks <mark@...dbalancer.org>
Subject: Re: [RFC net-next] ipv6: Use destination address determined by IPVS

On Wed, 2013-10-16 at 11:13 +0900, Simon Horman wrote:

> That does seem very promising but while implementing it
> I hit a problem.
> 
> struct tcp_skb_cb includes a field of type struct inet6_skb_parm.  And
> expanding struct inet6_skb_parm by 16 bytes means that struct tcp_skb_cb is
> now larger than 48 bytes and no longer fits in skb->cb.
> 
> Is it appropriate to grow skb->cb as the comment above struct tcp_skb_cb
> suggests?

Ah well...

No, its not appropriate to grow sk_buff by 16 bytes, sorry.

You could not change struct inet6_skb_parm, but define IP6CB as
a compound 

struct ip6cb {
   struct inet6_skb_parm foo;
   struct in6_addr       bar;
};



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