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

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Message-ID: <20140325212632.GD15723@casper.infradead.org>
Date:	Tue, 25 Mar 2014 21:26:32 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Jiri Pirko <jiri@...nulli.us>, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Andy Gospodarek <andy@...yhouse.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>,
	Scott Feldman <sfeldma@...ulusnetworks.com>,
	Lennert Buytenhek <buytenh@...tstofly.org>
Subject: Re: [patch net-next RFC 0/4] introduce infrastructure for support of
 switch chip datapath

On 03/25/14 at 01:11pm, Florian Fainelli wrote:
> 2014-03-25 12:35 GMT-07:00 Neil Horman <nhorman@...driver.com>:
> > On Tue, Mar 25, 2014 at 06:00:09PM +0000, Thomas Graf wrote:
> >> On top of that, like for VFs, we provide extended nested attributes or
> >> alternate control paths such as via OVS that provide the additional
> >> flexibility and control required by the more advanced devices.
> > I'm sorry, I don't understand the relevance here.  Are you suggesting that to
> > make this modification, we would need to augment more than a single set of
> > netlink control paths?
> 
> Not sure if I got this right, but there might be additional control
> knobs required for specific Ethernet switch features that do not map
> nicely, if at all with existing interfaces provided by ip/tc,
> ethtool... although I guess one would say, well, then go add these
> APIs instead of creating "extended" ones?

Exactly. Some of the logic and configuration structure will not
fit the existing model and is too switch specific to justify
extending the generic link model. It also seems likely that some
knobs will be switch specific. Not an issue as long as they are
tunneled through the standard API and any effort is undertaken
to generalize where it makes sense.
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