netdev - Re: [patch net-next RFC 10/12] openvswitch: add support for datapath hardware offload

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Message-ID: <20140826161956.GA15316@casper.infradead.org>
Date:	Tue, 26 Aug 2014 17:19:56 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	Jiri Pirko <jiri@...nulli.us>, Jamal Hadi Salim <jhs@...atatu.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	John Fastabend <john.fastabend@...il.com>,
	Scott Feldman <sfeldma@...ulusnetworks.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	dborkman <dborkman@...hat.com>, ogerlitz <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, f.fainelli@...il.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, Shrijeet Mukherjee <shm@...ulusnetworks.com>
Subject: Re: [patch net-next RFC 10/12] openvswitch: add support for datapath
 hardware offload

On 08/26/14 at 11:54am, Andy Gospodarek wrote:
> It is easy to *say* it could be added later, but connecting to software
> forwarding in the kernel outside of OVS (which is important to some)
> would take significant effort since this set only connects switch
> hardware to OVS.

Can you explain why that effort is more significant if a flow API
added first? I'm not saying it is easy to offload the existing
forwarding path, otherwise it would have been done already, but
I don't understand how the proposal makes this any more difficult.

> It may be that all software-based forwarding is done via OVS in the
> future, but it feels like we are long way from that future for those
> that do not want to use an external controller.

Wait... I don't want to use OpenFlow to configure my laptop ;-)

We should leave the controller out of this discussion though. A
controller is not required to run OVS at all. OpenStack Neutron
is a very good example for that. There are even applications which
use the OVS kernel datapath but not the OVS user space portion.
We have a wide set of APIs serving different purposes and need to
account for all of them. I'm as much interested in an offloaded
nftables and tc command as you.
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