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net: dsa: use NET_NAME_PREDICTABLE for user ports with name given in DT

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When a user port has a label in device tree, the corresponding
netdevice is, to quote include/uapi/linux/netdevice.h, "predictably
named by the kernel". This is also explicitly one of the intended use
cases for NET_NAME_PREDICTABLE, quoting 685343fc3b ("net: add
name_assign_type netdev attribute"):

  NET_NAME_PREDICTABLE:
    The ifname has been assigned by the kernel in a predictable way
    [...] Examples include [...] and names deduced from hardware
    properties (including being given explicitly by the firmware).

Expose that information properly for the benefit of userspace tools
that make decisions based on the name_assign_type attribute,
e.g. a systemd-udev rule with "kernel" in NamePolicy.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.faineli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Rasmus Villemoes 2022-11-16 11:52:03 +01:00 committed by Jakub Kicinski
parent 0171a1d22b
commit 6fdb038420
1 changed files with 1 additions and 1 deletions
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2
net/dsa/slave.c
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@ -2377,7 +2377,7 @@ int dsa_slave_create(struct dsa_port *port)
if (port->name) {
name = port->name;
assign_type = NET_NAME_UNKNOWN;
assign_type = NET_NAME_PREDICTABLE;
} else {
name = "eth%d";
assign_type = NET_NAME_UNKNOWN;