netdev - Re: [patch net-next v2 05/10] rocker: introduce rocker switch driver

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Message-ID: <20141111154017.GH1825@nanopsycho.lan>
Date:	Tue, 11 Nov 2014 16:40:17 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	John Fastabend <john.fastabend@...il.com>, netdev@...r.kernel.org,
	davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net,
	dborkman@...hat.com, ogerlitz@...lanox.com, jesse@...ira.com,
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	stephen@...workplumber.org, jeffrey.t.kirsher@...el.com,
	vyasevic@...hat.com, xiyou.wangcong@...il.com,
	john.r.fastabend@...el.com, edumazet@...gle.com, jhs@...atatu.com,
	sfeldma@...il.com, f.fainelli@...il.com, roopa@...ulusnetworks.com,
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	buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org,
	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
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	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org
Subject: Re: [patch net-next v2 05/10] rocker: introduce rocker switch driver

Tue, Nov 11, 2014 at 04:32:32PM CET, tgraf@...g.ch wrote:
>On 11/11/14 at 04:19pm, Jiri Pirko wrote:
>> Tue, Nov 11, 2014 at 03:29:46PM CET, tgraf@...g.ch wrote:
>> >On 11/10/14 at 02:04pm, John Fastabend wrote:
>> >> On 11/09/2014 02:51 AM, Jiri Pirko wrote:
>> >> >+static int rocker_port_sw_parent_id_get(struct net_device *dev,
>> >> >+					struct netdev_phys_item_id *psid)
>> >> >+{
>> >> >+	struct rocker_port *rocker_port = netdev_priv(dev);
>> >> >+	struct rocker *rocker = rocker_port->rocker;
>> >> >+
>> >> 
>> >> hmm looks like you read this out of a magic switch register :) but
>> >> my switch doesn't have this magic reg. I suposse the switch MAC address
>> >> should work.
>> >
>> >This needs more work afterwards. Either we define that the switch ID
>> >is only unique in combination with the parent ifindex or we need to
>> >introduce a notation of uniquness into the switch ID itself.
>> 
>> This is something similar to physical port id. Each driver should take
>> care of generating that id.
>
>If the ID is only unique within a driver, then the user space cannot
>rely on using the ID to group switch ports. Multiple drivers might
>come up with the same ID.

Well, as I said, it is the same as for physical port id. But if needed,
there can be added some simple mechanism for the id registration
ensuring their uniqueness.

>
>Even now, multiple rocker instances would have the same ID.

It depends on what hw returns to driver.
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