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

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Date:	Tue, 11 Nov 2014 07:44:47 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>
CC:	Thomas Graf <tgraf@...g.ch>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com,
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	ben@...adent.org.uk, stephen@...workplumber.org,
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	john.ronciak@...el.com, 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

On 11/11/2014 07:41 AM, Roopa Prabhu wrote:
> On 11/11/14, 7:32 AM, Thomas Graf 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.
>>
>> Even now, multiple rocker instances would have the same ID.
> yep, that was my concern on the switch id namespace handling (on the
> other thread).

At least the devices I work with have a burnt in MAC which could
be used for this.


-- 
John Fastabend         Intel Corporation
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