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From: Heiner Kallweit <hkallweit1@gmail.com>
To: "Marek Behún" <kabel@kernel.org>, "Michael Walle" <michael@walle.cc>
Cc: andrew@lunn.ch, anthony.l.nguyen@intel.com,
	bigeasy@linutronix.de, davem@davemloft.net,
	dvorax.fuxbrumer@linux.intel.com, f.fainelli@gmail.com,
	jacek.anaszewski@gmail.com, kuba@kernel.org, kurt@linutronix.de,
	linux-leds@vger.kernel.org, netdev@vger.kernel.org, pavel@ucw.cz,
	sasha.neftin@intel.com, vinicius.gomes@intel.com,
	vitaly.lifshits@intel.com
Subject: Re: [PATCH net-next 5/5] igc: Export LEDs
Date: Wed, 28 Jul 2021 22:43:30 +0200	[thread overview]
Message-ID: <25d3e798-09f5-56b5-5764-c60435109dd2@gmail.com> (raw)
In-Reply-To: <20210727183213.73f34141@thinkpad>

On 27.07.2021 18:32, Marek Behún wrote:
> Hi,
> 
> On Tue, 27 Jul 2021 17:53:58 +0200
> Michael Walle <michael@walle.cc> wrote:
> 
>>> If we used the devicename as you are suggesting, then for the two LEDs
>>> the devicename part would be the same:
>>>   ledA -> macA -> ethernet0
>>>   ledB -> phyB -> ethernet0
>>> although they are clearly on different MACs.  
>>
>> Why is that the case? Why can't both the MAC and the PHY request a 
>> unique name from the same namespace?
> 
> So all the network related devices should request a unique network
> relate device ID? Should also wireless PHY devices do this? WWAN modems?
> And all these should have the same template for devicename part withing
> /sys/class/leds? What should be the template for the devicename, if
> wireless PHYs and WWAN modems could also be part of this? It cannot be
> "ethernet" anymore.
> 
> It seems a better idea to me to just some nice identifier for the LED
> controller.
> 
>> As Andrew pointed out, the names in
>> /sys/class/leds don't really matter. Ok, it will still depend on the
>> probe order which might not be the case if you split it between ethmac
>> and ethphy.
> 
> Yes, the LED name does not matter. But the LED subsystem requires names
> in a specific format, this is already decided and documented, we are
> not going to be changing this. The only reasonable thing we can do now
> is to choose a sane devicename.
> 
>> Sorry, if I may ask stupid questions here. I don't want to cause much
>> trouble, here. I was just wondering why we have to make up two different
>> (totally unrelated names to the network interface names) instead of just
>> one (again totally unrelated to the interface name and index).
> 
> It seems more logical to me from kernel's point of view.
> 
>> But I was actually referring to your "you see the leds in /sys/ of all
>> the network adapters". That problem still persists, right?
> 
> Yes, this still persists. But we really do not want to start
> introducing namespaces to the LED subsystem.
> 
> Marek
> 

Did we come to any conclusion?

My preliminary r8169 implementation now creates the following LED names:

lrwxrwxrwx 1 root root 0 Jul 26 22:50 r8169-led0-0300 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/r8169-led0-0300
lrwxrwxrwx 1 root root 0 Jul 26 22:50 r8169-led1-0300 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/r8169-led1-0300
lrwxrwxrwx 1 root root 0 Jul 26 22:50 r8169-led2-0300 -> ../../devices/pci0000:00/0000:00:1d.0/0000:03:00.0/net/enp3s0/r8169-led2-0300

I understood that LEDs should at least be renamed to r8169-0300::link-0
to link-2 Is this correct? Or do we have to wait with any network LED support
for a name discussion outcome?

For the different LED modes I defined private hw triggers (using trigger_type
to make the triggers usable with r8169 LEDs only). The trigger attribute now
looks like this:

[none] link_10_100 link_1000 link_10_100_1000 link_ACT link_10_100_ACT link_1000_ACT link_10_100_1000_ACT

Nice, or? Issue is just that these trigger names really should be made a
standard for all network LEDs. I don't care about the exact naming, important
is just that trigger names are the same, no matter whether it's about a r8169-
or igc- or whatever network chip controlled LEDs.

And I don't have a good solution for initialization yet. LED mode is whatever
BIOS sets, but initial trigger value is "none". I would have to read the
initial LED control register values, iterate over the triggers to find the
matching one, and call led_trigger_set() to properly set this trigger as
current trigger. Most likely this would need some LED core extensions:
- enable iterating over all triggers with a particular trigger_type
- enable triggers to have private data
Quite some hassle for a small functionality.

  parent reply	other threads:[~2021-07-28 20:43 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16 21:24 [PATCH net-next 0/5][pull request] 1GbE Intel Wired LAN Driver Updates 2021-07-16 Tony Nguyen
2021-07-16 21:24 ` [PATCH net-next 1/5] igc: Add possibility to add flex filter Tony Nguyen
2021-07-16 21:24 ` [PATCH net-next 2/5] igc: Integrate flex filter into ethtool ops Tony Nguyen
2021-07-16 21:24 ` [PATCH net-next 3/5] igc: Allow for Flex Filters to be installed Tony Nguyen
2021-07-16 21:24 ` [PATCH net-next 4/5] igc: Make flex filter more flexible Tony Nguyen
2021-07-16 21:24 ` [PATCH net-next 5/5] igc: Export LEDs Tony Nguyen
2021-07-16 21:56   ` Andrew Lunn
2021-07-18 22:10     ` Heiner Kallweit
2021-07-18 22:33       ` Andrew Lunn
2021-07-19  6:17         ` Kurt Kanzenbach
2021-07-19  9:46           ` Jakub Kicinski
2021-07-19  6:06     ` Kurt Kanzenbach
2021-07-19 13:15       ` Andrew Lunn
2021-07-20  8:54         ` Kurt Kanzenbach
2021-07-21 19:18         ` Marek Behún
2021-07-18 22:19   ` Heiner Kallweit
2021-07-19  0:40     ` Andrew Lunn
2021-07-20 15:00       ` Heiner Kallweit
2021-07-20 15:42         ` Andrew Lunn
2021-07-20 20:29           ` Heiner Kallweit
2021-07-21 14:35             ` Andrew Lunn
2021-07-21 16:02               ` Heiner Kallweit
2021-07-21 18:23               ` Pavel Machek
2021-07-21 18:25                 ` Pavel Machek
2021-07-21 18:45             ` Marek Behún
2021-07-21 19:50               ` Andrew Lunn
2021-07-21 20:07                 ` Marek Behún
2021-07-21 20:54                   ` Andrew Lunn
2021-07-21 21:31                     ` Marek Behún
2021-07-21 22:45                     ` Pavel Machek
2021-07-22  1:45                       ` Andrew Lunn
2021-07-22  2:19                         ` Marek Behún
2021-07-21 22:34                   ` Pavel Machek
2021-07-22  3:52                   ` Florian Fainelli
2021-07-26 17:42                   ` Jacek Anaszewski
2021-07-26 18:44                     ` Marek Behún
2021-07-26 20:59                     ` Heiner Kallweit
2021-07-27  0:06                       ` Marek Behún
2021-07-27  1:57                         ` Andrew Lunn
2021-07-27  8:15                           ` Michael Walle
2021-07-27 14:56                             ` Marek Behún
2021-07-27 15:03                               ` Michael Walle
2021-07-27 15:24                                 ` Andrew Lunn
2021-07-27 15:28                                 ` Marek Behún
2021-07-27 15:53                                   ` Michael Walle
2021-07-27 16:23                                     ` Andrew Lunn
2021-07-27 16:32                                     ` Marek Behún
2021-07-27 16:42                                       ` Andrew Lunn
2021-07-27 19:42                                       ` Michael Walle
2021-07-28 20:43                                       ` Heiner Kallweit [this message]
2021-07-29  6:39                                         ` Kurt Kanzenbach
2021-07-29  8:59                                         ` Marek Behún
2021-07-29 21:54                                           ` Heiner Kallweit
2021-08-10 17:29                                         ` Pavel Machek
2021-08-10 17:55                                           ` Marek Behún
2021-08-10 19:53                                             ` Pavel Machek
2021-08-10 20:53                                               ` Marek Behún
2021-08-17 19:02                                                 ` Pavel Machek
2021-08-25 15:26                                                   ` Marek Behún
2021-08-26 12:45                                                     ` Pavel Machek
2021-08-10 20:46                                           ` Heiner Kallweit
2021-08-10 21:21                                             ` Andrew Lunn
2021-07-27 13:55                           ` Marek Behún
2021-08-10 17:22                             ` Documentation for naming LEDs was " Pavel Machek
2021-07-19 21:48   ` Jesse Brandeburg
2021-07-20 13:31     ` Kurt Kanzenbach
2021-07-17  0:30 ` [PATCH net-next 0/5][pull request] 1GbE Intel Wired LAN Driver Updates 2021-07-16 patchwork-bot+netdevbpf
2021-07-17 17:36   ` Andrew Lunn

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