Re: [PATCH AUTOSEL 6.0 09/13] net: loopback: use NET_NAME_PREDICTABLE for name_assign_type

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On Tue, Dec 06, 2022 at 11:49:56AM -0800, Jakub Kicinski wrote:
On Tue,  6 Dec 2022 04:49:12 -0500 Sasha Levin wrote:
From: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>

[ 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.

Yeah... we should have applied it to -next, I think backporting it is
a good idea but I wish it had more time in the -next tree since it's
a "uAPI alignment" :(

Oh, well, very unlikely it will break anything, tho, so let's do it.

Want me to push it back a week to the next batch? It'll give it two
weeks instead of the usual week.

--
Thanks,
Sasha



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