netdev - Re: [patch net-next v3 04/17] net: introduce generic switch devices support

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Date:	Tue, 25 Nov 2014 22:33:36 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	Jiri Pirko <jiri@...nulli.us>, 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, sfeldma@...il.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, 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, simon.horman@...ronome.com,
	alexander.h.duyck@...hat.com, john.ronciak@...el.com,
	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org
Subject: Re: [patch net-next v3 04/17] net: introduce generic switch devices
 support

On 11/25/14 16:54, Thomas Graf wrote:
> On 11/25/14 at 12:08pm, Jamal Hadi Salim wrote:

> It would definitely help if you could expose some more details on the
> "some network processor" you have. We're all very eager ;-)
>

Well, this thing doesnt run ovs ;-> (/me runs). If you come
to netdev i may let you play with it ;-> Its a humongous device
(think multi 100G ports).

On a serious note: Even if you took what Simon/Netronome has
(yes, I know they use ovs;->) - there is really no need for a switch
abstraction *at all* if all you want to is hang a packet
processing graph that ingresses at a port and egress at another port.
As you know, Linux supports it just fine with tc.

> I'm with Jiri but I agree it's not a perfect fit. I doubt there is but
> if you can come up with something that fits better I'm open to it.
>
> I considered "dataplane" or "dp" for a bit but it's quite generic as
> well.
>

The purpose is to offload. I think any name would be better than
mapping it to a specific abstraction called "switch". Especially
if it is hanging off a port and there is no switch in the pipeline.

cheers,
jamal
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