netdev - Re: [patch v2, kernel version 3.2.1] net/ipv4/ip

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Message-ID: <20120116202907.GF1077372@jupiter.n2.diac24.net>
Date:	Mon, 16 Jan 2012 21:29:07 +0100
From:	David Lamparter <equinox@...c24.net>
To:	Štefan Gula <steweg@...t.sk>
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"David S. Miller" <davem@...emloft.net>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v2, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

At the risk of repeating myself, Linux GRE support already has
provisions for multipoint tunnels. And unlike your code, those reuse the
existing neighbor table infrastructure, including all of its user
interface and introspection capabilities.

It's actually slightly visible in your patch:

On Mon, Jan 16, 2012 at 08:45:14PM +0100, Štefan Gula wrote:
> +++ linux-3.2.1-my/net/ipv4/ip_gre.c	2012-01-16 20:42:03.000000000 +0100
> @@ -716,7 +942,19 @@ static netdev_tx_t ipgre_tunnel_xmit(str
[...]
>  		/* NBMA tunnel */
> 
>  		if (skb_dst(skb) == NULL) {


-David
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