netdev - Re: [PATCH net-next RFC v2 2/3] ipv4: add support for light weight tunnel encap attributes

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Date:	Fri, 19 Jun 2015 16:19:13 +0100
From:	Robert Shearman <rshearma@...cade.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>, <ebiederm@...ssion.com>,
	<tgraf@...g.ch>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next RFC v2 2/3] ipv4: add support for light weight
 tunnel encap attributes

On 19/06/15 05:49, Roopa Prabhu wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> Introduces two netlink attributes RTA_ENCAP_TYPE and
> RTA_ENCAP to support attaching encap information to ipv4 routes.

Surely RTA_ENCAP_TYPE should be part of RTA_ENCAP, since the type 
doesn't make sense without the data and vice versa?

>
> RTA_ENCAP is a nested attribute as suggested by Thomas
> (and also as Robert had it in his series). RTA_ENCAP
> netlink policy is declared by the light weight tunnel
> drivers that support this encap type.
>
> fib code calls the following for each nexthop:
> 	- new route handler:
> 		lwt build state (that parses RTA_ENCAP and returns
> 	  	lwt state that lives in every fib_nh)
> 	- del dump hanlder:
> 		lwt release handler to release lwt state data
> 	- route dump hanlder:
> 		lwt dump encap to fill RTA_ENCAP data
> 	- during input route lookup
> 		sets dst->output to lwtunnel_output which
> 		in turn calls the corresponding lwt tunnel
> 		output function which applies the required
> 		encap and xmits the packet
>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>

Thanks,
Rob
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