netdev - Re: [QUESTION] About IPv6 flowlabel in a TCP IPv6 Server

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Message-Id: <200906221145.40481.remi.denis-courmont@nokia.com>
Date:	Mon, 22 Jun 2009 11:45:40 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Kengo Sakai <kengo.sakai@....jp>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [QUESTION] About IPv6 flowlabel in a TCP IPv6 Server


	Hello Kengo-san,

On Tuesday 16 June 2009 04:37:21 ext Kengo Sakai wrote:
> 2) Can a flowlabel be set to a sending packet in a TCP IPv6 Server?

I don't understand your question. To me, you cannot send "packets", at least 
not directly, via TCP sockets in the first place. Userland pushes data to the 
kernel buffers, and those buffers are segmented in some opaque (from userland) 
way. There is certainly no 1:1 matching of send() calls to packets.

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki

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