netdev - Re: [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath

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Message-Id: <3C265410-A9DF-489F-BC55-05B231564D12@cumulusnetworks.com>
Date:	Wed, 2 Apr 2014 12:54:50 -0700
From:	Scott Feldman <sfeldma@...ulusnetworks.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Andy Gospodarek <andy@...yhouse.net>,
	Jiri Pirko <jiri@...nulli.us>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Thomas Graf <tgraf@...g.ch>, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	dborkman <dborkman@...hat.com>, ogerlitz <ogerlitz@...lanox.com>,
	jesse <jesse@...ira.com>, pshelar <pshelar@...ira.com>,
	azhou <azhou@...ira.com>, Ben Hutchings <ben@...adent.org.uk>,
	Stephen Hemminger <stephen@...workplumber.org>,
	jeffrey.t.kirsher@...el.com, vyasevic <vyasevic@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Shrijeet Mukherjee <shm@...ulusnetworks.com>
Subject: Re: [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath


On Apr 2, 2014, at 12:29 PM, John W. Linville <linville@...driver.com> wrote:

> Cool!  I'm glad we agree.  Now we just need some switch hardware
> drivers that fit the general model outlined above...

Why wait?  Let’s create a switch device in qemu and then write the model/sample driver to that.  Put a PCI front end on the qemu device which is mapped to kernel, and define a register set to represent all the switch-like ops we want to offload, in a generic way.  Throw in some DMA for CPU-bound I/O (ctrl traffic).  On the qemu device back end, expose the ports as taps or whatever so we can wire to real-world link partners on the host side.

> I would be happy to maintain a kernel.org git tree as a nursery for
> such drivers as they develop and mature, and I'm sure my daytime
> employer would be happy to support me on that.  I wonder if we can
> get any switch people from Intel, Mellanox, Broadcom, or elsewhere
> to play along?

My gut tells me this is a build-it-and-they-will-come situation.

-scott--
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