netdev - Re: [PATCH net-next RFC v2 1/3] lwt: infrastructure to support light weight tunnels

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Date:	Sun, 21 Jun 2015 22:40:44 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	roopa <roopa@...ulusnetworks.com>
Cc:	Robert Shearman <rshearma@...cade.com>, ebiederm@...ssion.com,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next RFC v2 1/3] lwt: infrastructure to support light
 weight tunnels

On 06/20/15 at 07:27am, roopa wrote:
> On 6/19/15, 11:39 AM, Robert Shearman wrote:
> >On 19/06/15 19:34, roopa wrote:
> >>On 6/19/15, 10:25 AM, Robert Shearman wrote:
> >>>n 19/06/15 16:14, roopa wrote:
> >>>
> >>In the netdevice case, this output function is not called atall. It
> >>should just follow the existing netdevice the route is pointing to.
> >
> >Sorry for not being clear, but I meant that there would have to be
> >lwtunnel_skb_lwstate functions for ipv4 and ipv6 to match the output
> >functions. So in the vxlan use case where it's using a netdevice, how
> >would it determine which one to call?
> 
> thanks for that clarification, and good point. I see some areas of the
> kernel checking for skb->protocol to do the conversion (something like
> below). I am guessing that is acceptable.
> if (skb->protocol == htons(ETH_P_IPV6))
>                 struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);

I'm not yet convinced that it makes sense to offer the no-netdevice
shortcut for VXLAN. I'm not convinced we need yet another VXLAN data
path. In fact, I'm trying to get rid of the OVS one for this specific
reason.

I have no objection though if somebody comes up with an architecture
that can't just pass the required metadata between the namespaces and
do the actual encapsulation in a single net_device in the root/host
namespace.

Either way, I thin it's fair to defer to this to a later point. We
don't need to solve this for the first iteration of MPLS and VXLAN
implementation.
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