netdev - Re: [patch net-next 00/13] introduce rocker switch driver with openvswitch hardware accelerated datapath

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Date:	Tue, 16 Sep 2014 17:58:32 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com,
	jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com,
	ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, dev@...nvswitch.org, jasowang@...hat.com,
	ebiederm@...ssion.com, nicolas.dichtel@...nd.com,
	ryazanov.s.a@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, nbd@...nwrt.org, alexei.starovoitov@...il.com,
	Neil.Jerram@...aswitch.com, ronye@...lanox.com
Subject: Re: [patch net-next 00/13] introduce rocker switch driver with
 openvswitch hardware accelerated datapath

Mon, Sep 08, 2014 at 03:54:13PM CEST, tgraf@...g.ch wrote:
>On 09/03/14 at 11:24am, Jiri Pirko wrote:
>> This patchset can be divided into 3 main sections:
>> - introduce switchdev api for implementing switch drivers
>> - add hardware acceleration bits into openvswitch datapath, This uses
>>   previously mentioned switchdev api
>> - introduce rocker switch driver which implements switchdev api
>
>Jiri, Scott,
>
>Enclosed is the GOOG doc which outlines some details on my particular
>interests [0]. It includes several diagrams which might help to
>understand the overall arch. It is highly related to John's work as
>well. Please let me know if something does not align with the model
>you have in mind.


Hi Thomas.

Sorry for late answer, I returned from vacation yesterday.
I went over your document, I did not find anything which would not align
with our approach. Looks good to me.

>
>Summary:
>The full virtual tunnel endpoint flow offload attempts to offload full
>flows to the hardware and utilize the embedded switch on the host NIC
>to empower the eSwitch with the required flexibility of the software
>driven network. In this model, the guest (VM or LXC) attaches through a
>SR-IOV VF which serves as the primary path. A slow path / software path
>is provided via the CPU which can route packets back into the VF by
>tagging packets with forwarding metadata and sending the frame back to
>the NIC.
>
>[0] https://docs.google.com/document/d/195waUliu7G5YYVuXHmLmHgJ38DFSte321WPq0oaFhyU/edit?usp=sharing
>(Publicly accessible and open for comments)
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