linux-kernel - Re: [PATCH v3 2/3] net: dsa: use NET_NAME_PREDICTABLE for user ports with name given in DT

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Message-ID: <Y3TojrwSOlDxl3Gc@lunn.ch>
Date:   Wed, 16 Nov 2022 14:41:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] net: dsa: use NET_NAME_PREDICTABLE for user ports
 with name given in DT

On Wed, Nov 16, 2022 at 11:52:03AM +0100, Rasmus Villemoes wrote:
> 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 685343fc3ba6 ("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@...musvillemoes.dk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew