netdev - Re: [patch net-next v2 8/9] switchdev: introduce Netlink API

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Message-ID: <20140923071922.GA6944@casper.infradead.org>
Date:	Tue, 23 Sep 2014 08:19:22 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	John Fastabend <john.r.fastabend@...el.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jesse Gross <jesse@...ira.com>,
	Pravin Shelar <pshelar@...ira.com>,
	Andy Zhou <azhou@...ira.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Vladislav Yasevich <vyasevic@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Scott Feldman <sfeldma@...ulusnetworks.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	John Linville <linville@...driver.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	Jason Wang <jasowang@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	ryazanov.s.a@...il.com, Lennert Buytenhek <buytenh@...tstofly.org>,
	aviadr@...lanox.com, Felix Fietkau <nbd@...nwrt.org>,
	Neil Jerram <Neil.Jerram@...aswitch.com>, ronye@...lanox.com,
	simon.horman@...ronome.com,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [patch net-next v2 8/9] switchdev: introduce Netlink API

On 09/22/14 at 06:36pm, John Fastabend wrote:
> n-tuple has some deficiencies,
> 
> 	- its not possible to get the capabilities to learn what
> 	  fields are supported by the device, what actions, etc.
> 
> 	- its ioctl based so we have to poll the device
> 
> 	- only supports a single table, where we have devices with
> 	  multiple tables
> 
> 	- sort of the same as above but it doesn't allow creating new
> 	  tables or destroying old tables.

OK, I understand where Tom was going. Given we add feature detection
capabilities this could be used to identify the guest for fixed length
encap. I still assume HW won't be able to match on the inner header
for any variable lengh encap with metadata packet unless it can
actually parse the encap. I hope I didn't bring encap format to this
thread at this very moment ;-)
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