net: loopback: use NET_NAME_PREDICTABLE for name_assign_type

[ 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.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 1b65f0f975cfb2167faf741ba04dd45768f2ff12..f04f9a87840e9c3b68f8782e9939cf7724371eba 100644 (file)
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -194,7 +194,7 @@ static __net_init int loopback_net_init(struct net *net)
        int err;
 
        err = -ENOMEM;
-       dev = alloc_netdev(0, "lo", NET_NAME_UNKNOWN, loopback_setup);
+       dev = alloc_netdev(0, "lo", NET_NAME_PREDICTABLE, loopback_setup);
        if (!dev)
                goto out;