netdev - Re: [patch v4, kernel version 3.2.1] net/ipv4/ip

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Message-ID: <1327470810.14373.39.camel@edumazet-laptop>
Date:	Wed, 25 Jan 2012 06:53:30 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stefan 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 v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

Le mercredi 18 janvier 2012 à 00:33 +0100, Stefan Gula a écrit :
> From: Stefan Gula <steweg@...il.com>
> 
> This patch is an extension for current Ethernet over GRE
> implementation, which allows user to create virtual bridge (multipoint
> VPN) and forward traffic based on Ethernet MAC address information in
> it. It simulates the Bridge behavior learning mechanism, but instead
> of learning port ID from which given MAC address comes, it learns IP
> address of peer which encapsulated given packet. Multicast, Broadcast
> and unknown-multicast traffic is send over network as multicast
> encapsulated GRE packet, so one Ethernet multipoint GRE tunnel can be
> represented as one single virtual switch on logical level and be also
> represented as one multicast IPv4 address on network level.
> 
> Signed-off-by: Stefan Gula <steweg@...il.com>
> 
> ---
> 

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

I guess remaining performance point is to get a refcount less
ip_route_output_gre(), aka ip_route_output_gre_noref() :)



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