netdev - Re: [PATCH net-next v3] route: allow to route in a peer netns via lwt framework

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Message-ID: <1438183251.20182.93.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 29 Jul 2015 17:20:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	roopa@...ulusnetworks.com, tgraf@...g.ch,
	alexei.starovoitov@...il.com
Subject: Re: [PATCH net-next v3] route: allow to route in a peer netns via
 lwt framework

On Wed, 2015-07-29 at 15:16 +0200, Nicolas Dichtel wrote:
> This patch takes advantage of the newly added lwtunnel framework to
> allow the user to set routes that point to a peer netns.
> 
> Packets are injected to the peer netns via the loopback device. It works
> only when the output device is 'lo'.
> 
> Example:
> ip route add 40.1.1.1/32 encap netns nsid 5 via dev lo
> 
> The goal is to be scalable when the number of netns is high (10k or more).
> Which this patch, we can save two interfaces (veth) per netns, which helps
> to to reduce memory consumption and the time needed to create a netns.


Really this is a hack Nicolas.

get_net_ns_by_id() was not meant to be used in data (fast ???) path.

Same for get_net() and put_net()

Plumbing like that should not happen in lo start_xmit()


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