netdev - Re: [PATCH RFC 0/7] Generic UDP Encapsulation

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Date:	Sat, 4 Jan 2014 15:13:53 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Jerry Chu <hkchu@...gle.com>
Subject: Re: [PATCH RFC 0/7] Generic UDP Encapsulation

On Sat, Jan 4, 2014 at 2:33 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Thu, 2 Jan 2014 14:12:06 -0800 (PST)
> Tom Herbert <therbert@...gle.com> wrote:
>
>> This patch series implements Generic UDP Encapsulation (GUE).
>> Intelligently encapsulating packets in UDP leverages device
>> support for UDP flows. The 5-tuple hash can be computed for UDP
>> to provide good ECMP, RSS, or link aggregation port selection.
>>
>> Generic UDP encapsulation refers to encapsulating packets of
>> arbitray IP protocols in UDP packets. Two flavors of GUE
>> are implemented in these patches:
>>
>> 1) Direct protocol encapsulation
>> 2) Encapsualtion in generic UDP encapsulation
>
> Is this a new wire protocol, or a simplification of existing
> tunnel code? It seems to be VXLAN without the VNI header.

It is a new protocol. See
http://tools.ietf.org/html/draft-herbert-gue-00. GUE is different from
VXLAN in that it includes a protocol type (L2, L3, L4 packets can be
encapsulated), header length and more flag bits (for extensibility),
and is not specific to the virtualization use case.
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