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

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Date:	Fri, 29 Aug 2014 10:20:55 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Thomas Graf <tgraf@...g.ch>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Jiri Pirko <jiri@...nulli.us>,
	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 Gross <jesse@...ira.com>,
	Pravin Shelar <pshelar@...ira.com>,
	Andy Zhou <azhou@...ira.com>, ben@...adent.org.uk,
	Stephen Hemminger <stephen@...workplumber.org>,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	Cong Wang <xiyou.wangcong@...il.com>,
	john.r.fastabend@...el.com, Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	John Linville <linville@...driver.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>, jasowang@...hat.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	ryazanov.s.a@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, nbd@...nwrt.org, 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 16:54, Thomas Graf wrote:
> On 08/26/14 at 01:13pm, Alexei Starovoitov wrote:
>> I think it's important distinction. In-kernel OVS is not OF.
>> It's a networking function that has hard-coded packet parser,
>> N-tuple match and programmable actions.
>> There were times when HW vendors were using OF check-box
>> to sell more chips, but at the end there is not a single HW
>> that is fully OF compliant. OF brand is still around, but
>> OF 2.0 is not tcam+action anymore.
>> Imo trying to standardize HW offload interface based on OF 1.x
>> principles is strange.


I actually have no issues with whatever classifier someone decides
to use. To each their poison. But I do take issue mandating the
specified classifer it as THE CLASSIFIER as in this case,
is where i start taking issue. I have a few things that i offload
to hardware with speacilized classifiers such that i object strongly
to the approach this driver has taken.

cheers,
jamal
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