netdev - Re: [systemd-devel] [PATCH] Use dev_port for the ID of a network device.

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Date:	Tue, 1 Jul 2014 14:59:09 +0200
From:	Kay Sievers <kay@...y.org>
To:	Tom Gundersen <teg@...m.no>
Cc:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [systemd-devel] [PATCH] Use dev_port for the ID of a network device.

On Tue, Jul 1, 2014 at 2:45 PM, Tom Gundersen <teg@...m.no> wrote:
> On Tue, Jul 1, 2014 at 2:32 PM, Thadeu Lima de Souza Cascardo
> <cascardo@...ux.vnet.ibm.com> wrote:
>> On Tue, Jul 01, 2014 at 02:33:19AM +0200, Kay Sievers wrote:
>>> On Mon, Jun 30, 2014 at 10:36 PM, Thadeu Lima de Souza Cascardo
>>> <cascardo@...ux.vnet.ibm.com> wrote:
>>> > For network devices on the same PCI function, dev_id should not be used,
>>> > since its purpose is for IPv6 support on interfaces with the same MAC
>>> > address.
>>> >
>>> > The new dev_port sysfs attribute should be used when it is found. When
>>> > it is not, using dev_id might work.
>>>
>>> I don't see a problem switching this over, but why would we keep using
>>> dev_id if it is not the right thing to use?
>>>
>>> Kay
>>>
>>
>> Because dev_port has only been introduced into Linux 3.15, and some
>> drivers used dev_id before Linux 3.10. It's not an ideal situation, so I
>> think it's important to keep some compatibility for the time being. Or
>> we could simply drop dev_id, and force everyone to do the right thing
>> and backport dev_port support and fix their drivers.
>
> If this fixes a real issue, I guess it would be nice to push the
> dev_port stuff to -stable. If it is accepted it would solve the
> backwards compatibility problem, and we could just drop dev_id from
> udev.

Let's drop it now and mention it in NEWS. That way, distros which
really care can add the compat hack to the code.

Kay
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