netdev - Re: [patch net-next v2 06/10] bridge: introduce fdb offloading via switchdev

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Date:	Mon, 10 Nov 2014 13:51:00 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org,
	davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net,
	dborkman@...hat.com, ogerlitz@...lanox.com, jesse@...ira.com,
	pshelar@...ira.com, azhou@...ira.com, ben@...adent.org.uk,
	stephen@...workplumber.org, jeffrey.t.kirsher@...el.com,
	vyasevic@...hat.com, xiyou.wangcong@...il.com,
	john.r.fastabend@...el.com, edumazet@...gle.com, sfeldma@...il.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	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, john.ronciak@...el.com,
	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org
Subject: Re: [patch net-next v2 06/10] bridge: introduce fdb offloading via
 switchdev

On 11/10/14 at 09:15am, Jiri Pirko wrote:
> There are few problems in re-using this. It is netlink based so for calling
> it from bridge code, we would have to construct netlink message. But
> that could be probably changed.
> As you can see from the list of parameters, this is no longer about fdb (addr,
> vlanid) but this has been extended to something else. See vxlan code for
> what this is used for. I believe that fdb_add/del should be renamed to
> something else, perhaps l2neigh_add/del or something like that.
> The other problem is that fdb_add/del is currently used by various
> drivers for different purpose (adding macs to unicast list).

Can you elaborate a bit on the intended semantic differences between
the existing ndo_fdb_add() and ndo_sw_port_fdb_add()? I'm not sure we
need the sw_ prefix for this specific ndo.

I completely agree that relying on Netlink is wrong because we'll have
in-kernel users of the API but I believe that existing ndo_fdb_add()
implementations in i40e, ixgbe, qlcnic and macvlan could use the new
API you propose.

How about we rename the existing ndo_fdb_add() to ndo_neigh_add() as
you propose and convert vxlan over to it and have all others which don't
even depend on the Netlink attributes being passed in (i40e, ixgbe,
qlcnic, macvlan) use ndo_fdb_add() which would have the behaviour of your
proposed ndo_sw_port_fdb_add()?
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