netdev - Re: [patch net-next v2 10/10] rocker: implement L2 bridge offloading

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Message-ID: <5460AF22.2040701@mojatatu.com>
Date:	Mon, 10 Nov 2014 07:27:14 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Scott Feldman <sfeldma@...il.com>
CC:	Jiri Pirko <jiri@...nulli.us>, Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, nhorman@...driver.com,
	Andy Gospodarek <andy@...yhouse.net>,
	Thomas Graf <tgraf@...g.ch>, dborkman@...hat.com,
	ogerlitz@...lanox.com, jesse@...ira.com, pshelar@...ira.com,
	azhou@...ira.com, ben@...adent.org.uk, stephen@...workplumber.org,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	vyasevic@...hat.com, xiyou.wangcong@...il.com,
	"Fastabend, John R" <john.r.fastabend@...el.com>,
	edumazet@...gle.com, Florian Fainelli <f.fainelli@...il.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	John Linville <linville@...driver.com>, jasowang@...hat.com,
	ebiederm@...ssion.com, nicolas.dichtel@...nd.com,
	ryazanov.s.a@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, nbd@...nwrt.org, alexei.starovoitov@...il.com,
	Neil.Jerram@...aswitch.com, ronye@...lanox.com,
	simon.horman@...ronome.com, alexander.h.duyck@...hat.com,
	"Ronciak, John" <john.ronciak@...el.com>, mleitner@...hat.com,
	Shrijeet Mukherjee <shrijeet@...il.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [patch net-next v2 10/10] rocker: implement L2 bridge offloading

On 11/10/14 03:46, Scott Feldman wrote:

>
> IFLA_BRPORT_LEARNING is u8 attr and we're only using lower bit to turn
> learning on/off.  Maybe we can use another bit to indicate learning to
> be done in sw or hw.  I don't think adding another bit would break
> existing iproute2.
>
> LEARNING_ENABLED    (1 << 0)
> LEARNING_HW              (1 << 1)
>
> Would this work?
>

Yes to making it a bit. But:
This is not *learning*. You are doing a *sync*.
Those are two different things.

Learning on/off exists today. It signals to the L2 whether you
should learn or not.
I like the way fdb_add/del work with a flag which says
it is the software and/or offloaded version. Please keep that
semantic.
What you are doing above is letting the hardware learn then
syncing to software. You need a different flag there. something
like:

SYNC_HW_FDB (1<<1)


cheers,
jamal
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