netdev - Re: [PATCH AUTOSEL 4.9 2/2] net: loopback: use NET_NAME_PREDICTABLE for name_assign

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Date:   Thu, 15 Dec 2022 13:09:21 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Pavel Machek <pavel@....cz>, Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jacob Keller <jacob.e.keller@...el.com>,
        "David S . Miller" <davem@...emloft.net>, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.9 2/2] net: loopback: use NET_NAME_PREDICTABLE
 for name_assign_type

On 15/12/2022 11.59, Pavel Machek wrote:
> Hi!
> 
>> From: Rasmus Villemoes <linux@...musvillemoes.dk>
>>
>> [ Upstream commit 31d929de5a112ee1b977a89c57de74710894bbbf ]
>>
>> When the name_assign_type attribute was introduced (commit
>> 685343fc3ba6, "net: add name_assign_type netdev attribute"), the
>> loopback device was explicitly mentioned as one which would make use
>> of NET_NAME_PREDICTABLE:
>>
>>     The name_assign_type attribute gives hints where the interface name of a
>>     given net-device comes from. These values are currently defined:
>> ...
>>       NET_NAME_PREDICTABLE:
>>         The ifname has been assigned by the kernel in a predictable way
>>         that is guaranteed to avoid reuse and always be the same for a
>>         given device. Examples include statically created devices like
>>         the loopback device [...]
>>
>> Switch to that so that reading /sys/class/net/lo/name_assign_type
>> produces something sensible instead of returning -EINVAL.
> 
> This was already part of the previous autosel:

Yup, but it was punted for a week:

https://lore.kernel.org/lkml/Y5AO7TrYsdeVqyI6@sashalap/