Re: rules for interface naming for on-board cards

From: Gadre Nayan <gadrenayan@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
Subject: Re: rules for interface naming for on-board cards
Date: Tue, 03 May 2016 04:28:30 +0000	[thread overview]
Message-ID: <CAKJ7aR47Y7EQ_C9mOiSnceeygwTixxUSwj4upqtJKqM4r4sj3w@mail.gmail.com> (raw)
In-Reply-To: <CAC+QLdTcFSqump4hD4mP67zWJSqcNVJR0aL+aDx0MqL_conCqw@mail.gmail.com>

Hi,

Thanks. I see that in my system for onboard devices I get a sysfs
attribute "acpi_index", which is not available for removable cards.

So currently existence and non existence of this file will be
sufficient to detect.

Thanks.

On Mon, May 2, 2016 at 10:22 PM, Mandeep Sandhu
<mandeepsandhu.chd@gmail.com> wrote:
>>
>> If the name contains a %d format string, the first available device
>> name with the given base is used; assigned numbers start at zero.
>>
>> On my base machine, I have 1 NIC card which is onboard, rest I can
>> remove and plug.
>> For the onboard card I get the interfaces as em1-4, while all the
>> other cards I get names as p1p2, p3p4 etc.
>
> This looks like systemd's way of naming network interfaces (aka
> predictable network interface names). Are you running a systemd
> enabled system?
>
> If so, look at this systemd guide for the naming convention:
>
> https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
>
> HTH,
> -mandeep
>
>
>>
>> Does Udev know the difference.
>>
>> How are these names given, definitely there must be some configuration
>> which is used to distinguish on-board card vs removable.
>>
>> Thanks.
>>
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