linux-kernel - Re: [PATCH] [RFC] tcp: add ability to set a timestamp offset (v2)

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Date:	Wed, 23 Jan 2013 20:20:25 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	netdev@...r.kernel.org, criu@...nvz.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Dave Jones <davej@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH] [RFC] tcp: add ability to set a timestamp offset (v2)

Hello!

On Wed, Jan 23, 2013 at 07:01:52PM +0400, Andrey Vagin wrote:
> -#define tcp_time_stamp         ((__u32)(jiffies))
> +#define tcp_time_stamp(tp)     ((__u32)(jiffies) + tp->tsoffset)

This implies that you always have some tp in hands. AFAIK this is not true,
so that I am puzzled how you were able to make something compilable with this definition.

At least in tcp_v4_send_ack() you obviously use some invalid tp, there is
no socket in hands there. The thing which is called "sk" is dummy.

With container migration I used per-container offset. When you have no container,
you have to do something a little bit smarter.

Alexey
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