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

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Date:	Tue, 25 Mar 2014 14:42:08 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
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

2014-03-25 14:26 GMT-07:00 Thomas Graf <tgraf@...g.ch>:
> 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.

The question is how you would imagine conveying these switch-specific
features that do not (yet) map into a general feature, shall we go for
a separate netlink family, just like what Felix did in OpenWrt with
swconfig, without much stability from one kernel release to another,
as we migrate what was once a switch specific feature into a general
Ethernet switch feature?
-- 
Florian
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