netdev - Re: [RFC net-next 3/3] mpls: new ipmpls device for encapsulating IP packets as mpls

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Message-ID: <87vbf5g0e1.fsf@x220.int.ebiederm.org>
Date:	Tue, 02 Jun 2015 18:23:50 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Robert Shearman <rshearma@...cade.com>, netdev@...r.kernel.org,
	roopa <roopa@...ulusnetworks.com>
Subject: Re: [RFC net-next 3/3] mpls: new ipmpls device for encapsulating IP packets as mpls

Thomas Graf <tgraf@...g.ch> writes:

> On 06/02/15 at 01:26pm, Eric W. Biederman wrote:
>> What we really want here is xfrm-lite.  By lite I mean the tunnel
>> selection criteria is simple enough that it fits into the normal
>> routing table instead of having to do weird flow based magic that
>> is rarely needed.
>> 
>> I believe what we want are the xfrm stacking of dst entries.
>
> I assume you are referring to reusing the selector and stacked
> dst. I considered that for the transmit side.
>
> Can you elaborate on this some more? How would this look like
> for the specific case of VXLAN? Any thoughts on the receive
> side? You also mention that you dislike the net_device approach.
> What do you suggest instead? The encapsulation is often postponed
> to after the packet is fully constructed. Where should it get
> hooked into?

Thomas I may have misunderstood what you are trying to do.

Is what you were aiming for roughly the existing RTA_FLOW so you can
transmit packets out one network device and have enough information to
know which of a set of tunnels of a given type you want the packets go
into?

Eric



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