netdev - Re: [PATCH net-next 5/5] igc: Export LEDs

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Date:   Wed, 21 Jul 2021 16:35:27 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Pavel Machek <pavel@....cz>,
        Tony Nguyen <anthony.l.nguyen@...el.com>, davem@...emloft.net,
        kuba@...nel.org, Kurt Kanzenbach <kurt@...utronix.de>,
        netdev@...r.kernel.org, sasha.neftin@...el.com,
        vitaly.lifshits@...el.com, vinicius.gomes@...el.com,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>
Subject: Re: [PATCH net-next 5/5] igc: Export LEDs

> Thanks for the hint, Andrew. If I make &netdev->dev the parent,
> then I get:
> 
> ll /sys/class/leds/
> total 0
> lrwxrwxrwx 1 root root 0 Jul 20 21:37 led0 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/led0
> lrwxrwxrwx 1 root root 0 Jul 20 21:37 led1 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/led1
> lrwxrwxrwx 1 root root 0 Jul 20 21:37 led2 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/led2
> 
> Now the (linked) LED devices are under /sys/class/net/<ifname>, but still
> the primary LED devices are under /sys/class/leds and their names have
> to be unique therefore. The LED subsystem takes care of unique names,
> but in case of a second network interface the LED device name suddenly
> would be led0_1 (IIRC). So the names wouldn't be predictable, and I think
> that's not what we want.

We need input from the LED maintainers, but do we actually need the
symbolic links in /sys/class/leds/? For this specific use case, not
generally. Allow an LED to opt out of the /sys/class/leds symlink.

If we could drop those, we can relax the naming requirements so that
the names is unique to a parent device, not globally unique.

    Andrew