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

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Date:   Mon, 28 Sep 2020 19:10:05 +0200
From:   Alexander Dahl <post@...pocky.de>
To:     Marek Behun <marek.behun@....cz>
Cc:     Alexander Dahl <ada@...rsis.com>, 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

Hei hei,

On Mon, Sep 28, 2020 at 05:52:09PM +0200, Marek Behun wrote:
> 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.

Yes.  IIRC ethtool uses libmnl for communicating with the kernel
through the netlink interface.

> > 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.

I saw proprietary embedded C++ applications building on top of
proprietary C libraries interacting with the sysfs leds interface …
O:-)

> > Does anyone else know prior work for linux leds sysfs interface from 
> > userspace?
> 
> I am not aware of that, everyone just uses sysfs now.

Sorry, that was maybe misleading.  What I wanted to know was if there
already is some free library/tool using that sysfs interface?  I
suppose not, otherwise "ledtool" would not be needed?  IIRC there are
generic libs for abstracting sysfs access, but I did not like them.
;-)

Long story short, I would be interested in helping on a ledtool /
libledtool in C in my spare time.  (No time to learn Rust at the
moment though.)

Greets
Alex

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