netdev - Re: Request for Comment: LED device naming for netdev LEDs

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Date:   Mon, 28 Sep 2020 17:52:09 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Alexander Dahl <ada@...rsis.com>
Cc:     linux-leds@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        Alexander Dahl <post@...pocky.de>
Subject: Re: Request for Comment: LED device naming for netdev LEDs

On Mon, 28 Sep 2020 15:04:10 +0200
Alexander Dahl <ada@...rsis.com> wrote:

> Hei Marek,
> 
> Am Sonntag, 27. September 2020, 02:52:58 CEST schrieb Marek Behun:
> > On Sun, 27 Sep 2020 00:40:25 +0200
> > 
> > Marek Behun <marek.behun@....cz> wrote:  
> > > What I am wondering is how should we select a name for the device part
> > > of the LED for network devices, when network namespaces are enabled.
> > > 
> > > a) We could just use the interface name (eth0:yellow:activity). The
> > > 
> > >    problem is what should happen when the interface is renamed, or
> > >    moved to another network namespace.
> > >    Pavel doesn't want to complicate the LED subsystem with LED device
> > >    renaming, nor, I think, with namespace mechanism. I, for my part, am
> > >    not opposed to LED renaming, but do not know what should happen when
> > >    the interface is moved to another namespace.
> > > 
> > > b) We could use the device name, as in struct device *. But these names
> > > 
> > >    are often too long and may contain characters that we do not want in
> > >    LED name (':', or '/', for example).
> > > 
> > > c) We could create a new naming mechanism, something like
> > > 
> > >    device_pretty_name(dev), which some classes may implement somehow.
> > > 
> > > What are your ideas about this problem?
> > > 
> > > Marek  
> > 
> > BTW option b) and c) can be usable if we create a new utility, ledtool,
> > to report infromation about LEDs and configure LEDs.
> > 
> > In that case it does not matter if the LED is named
> >   ethernet-adapter0:red:activity
> > or
> >   ethernet-phy0:red:activity
> > because this new ledtool utility could just look deeper into sysfs to
> > find out that the LED corresponds to eth0, whatever it name is.  
> 
> I like the idea to have such a tool.  What do you have in mind?  Sounds for me 
> like it would be somehow similar to libgpiod with gpio* for GPIO devices or 
> like libevdev for input devices or like mtd-utils …
> 
As Pavel said, we have ethtool, maybe we could have ledtool.

> Especially a userspace library could be helpful to avoid reinventing the wheel 
> on userspace developer side?

If such a need arises, than yes. For most embedded systems though I
think ledtool would be enough, since mostly LEDs can be controlled from
shell scripts.

> Does anyone else know prior work for linux leds sysfs interface from 
> userspace?

I am not aware of that, everyone just uses sysfs now.

Marek