linux-kernel - Re: [PATCH] vlan: set sysfs device

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Date:	Tue, 23 Oct 2012 16:03:31 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	David Miller <davem@...emloft.net>, cardoe@...doe.com,
	kaber@...sh.net, netdev@...r.kernel.org,
	systemd-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vlan: set sysfs device_type to 'vlan'

On 10/23/2012 03:52 PM, Ben Hutchings wrote:
> On Tue, 2012-10-23 at 09:14 -0700, Ben Greear wrote:
>> On 10/22/2012 11:36 PM, David Miller wrote:
>>> From: Doug Goldstein <cardoe@...doe.com>
>>> Date: Mon, 22 Oct 2012 00:53:57 -0500
>>>
>>>> Sets the sysfs device_type to 'vlan' for udev. This makes it easier for
>>>> applications that query network information via udev to identify vlans
>>>> instead of using strrchr().
>>>>
>>>> Signed-off-by: Doug Goldstein <cardoe@...doe.com>
>>>
>>> You're extremely misguided.  This change, in fact, makes it ten times
>>> harder for such applications to query such devices.
>>
>> If the application doesn't care, it can use the old way (which at least
>> for me, involves string-comparing the driver name ethtool returns, which
>> sucks at best).
>
> The 'old way' that has only worked since Linux 2.6.29 (3.5 years)?
>
> The 'right way' seems to be to query for VLAN information through
> netlink.  But that has only worked since Linux 2.6.23 (5 years ago).
> The real 'old way' is to use SIOCGIFVLAN. :-/

Oh, I have the SIOCGIFVLAN fallback in place too.

But none of this is easy from a shell script, where reading a sysfs
file is quite easy.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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