netdev - Re: [PATCH net-next 00/22 v2] Lightweight & flow based encapsulation

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Message-Id: <20150721.103944.1416365175440789268.davem@davemloft.net>
Date:	Tue, 21 Jul 2015 10:39:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...g.ch
Cc:	roopa@...ulusnetworks.com, rshearma@...cade.com,
	ebiederm@...ssion.com, hannes@...essinduktion.org,
	pshelar@...ira.com, jesse@...ira.com, daniel@...earbox.net,
	tom@...bertland.com, edumazet@...gle.com, jiri@...nulli.us,
	marcelo.leitner@...il.com, stephen@...workplumber.org,
	jpettit@...ira.com, kaber@...sh.net, simon.horman@...ronome.com,
	joestringer@...ira.com, ja@....bg, ast@...mgrid.com,
	weichunc@...mgrid.com, netdev@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [PATCH net-next 00/22 v2] Lightweight & flow based
 encapsulation

From: Thomas Graf <tgraf@...g.ch>
Date: Tue, 21 Jul 2015 10:43:44 +0200

> This series combines the work previously posted by Roopa, Robert and
> myself. It's according to what we discussed at NFWS. The motivation
> of this series is to:
> 
>  * Consolidate code between OVS and the rest of the kernel and get
>    rid of OVS vports and instead represent them as pure net_devices.
>  * Introduce a lightweight tunneling mechanism which enables flow
>    based encapsulation to improve scalability on both RX and TX.
>  * Do the above in an encapsulation unspecific way so that the
>    encapsulation type is eventually abstracted away from the user.
>  * Use the same forwarding decision for both native forwarding and
>    encapsulation thus allowing to switch between native IPv6 and
>    UDP encapsulation based on endpoint without requiring additional
>    logic
> 
> The fundamental changes introduces in this series are:
>  * A new RTA_ENCAP Netlink attribute for routes carrying encapsulation
>    instructions. Depending on the specified type, the instructions
>    apply to UDP encapsulations, MPLS and possible other in the future.
>  * Depending on the encapsulation type, the output function of the
>    dst is directly overwritten or the dst merely attaches metadata and
>    relies on a subsequent net_device to apply it to the packet. The
>    latter is typically used if an inner and outer IP header exist which
>    require two subsequent routing lookups to be performed.
>  * A new metadata_dst structure which can be attached to skbs to
>    carry metadata in between subsystems. This new metadata transport
>    is used to provide a single interface for VXLAN, routing and OVS
>    to communicate through metadata.

Series applied, but please take Alexei's endianness feedback into
consideration.

Thanks!
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