netdev - Re: [patch net-next 2/3] rtnl: export physical port id via RT netlink

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Date:	Fri, 19 Jul 2013 19:13:03 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	stephen@...workplumber.org, Narendra_K@...l.com,
	john.r.fastabend@...el.com
Subject: Re: [patch net-next 2/3] rtnl: export physical port id via RT netlink

Fri, Jul 19, 2013 at 06:07:10PM CEST, bhutchings@...arflare.com wrote:
>On Fri, 2013-07-19 at 15:55 +0200, Jiri Pirko wrote:
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  include/uapi/linux/if_link.h |  1 +
>>  net/core/rtnetlink.c         | 25 ++++++++++++++++++++++++-
>>  2 files changed, 25 insertions(+), 1 deletion(-)
>> 
>> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>> index 03f6170..04c0e7a 100644
>> --- a/include/uapi/linux/if_link.h
>> +++ b/include/uapi/linux/if_link.h
>[...]
>> @@ -846,6 +847,24 @@ static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
>>  	return 0;
>>  }
>>  
>> +static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
>> +{
>> +	int err;
>> +	struct netdev_phys_port_id ppid;
>> +
>> +	if (!dev->netdev_ops->ndo_get_phys_port_id)
>> +		return 0;
>> +
>> +	err = dev->netdev_ops->ndo_get_phys_port_id(dev, &ppid);
>> +	if (err)
>> +		return err;
>[...]
>
>I can imagine a driver only sometimes being able to get the physical
>port ID, depending on hardware variant or firmware version.  That
>shouldn't require defining another instance of net_device_ops.  So if
>the error is -EOPNOTSUPP this should return 0, same as if the function
>pointer is NULL.  

Makes sense. I will adjust this. Thanks Ben.

>
>Ben.
>
>-- 
>Ben Hutchings, Staff Engineer, Solarflare
>Not speaking for my employer; that's the marketing department's job.
>They asked us to note that Solarflare product names are trademarked.
>
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