linux-kernel - Re: [PATCH v3 1/2] leds: trigger: netdev: extend speeds up to 10G

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Message-ID: <cdcab57e-ef73-436d-8dac-f92219e4cbf9@lunn.ch>
Date:   Thu, 7 Dec 2023 18:11:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behún <kabel@...nel.org>
Cc:     Daniel Golle <daniel@...rotopia.org>, Lee Jones <lee@...nel.org>,
        Pavel Machek <pavel@....cz>, Jakub Kicinski <kuba@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Li Zetao <lizetao1@...wei.com>, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 1/2] leds: trigger: netdev: extend speeds up to 10G

On Thu, Dec 07, 2023 at 05:29:23PM +0100, Marek Behún wrote:
> On Tue, 28 Nov 2023 04:00:10 +0000
> Daniel Golle <daniel@...rotopia.org> wrote:
> 
> > Add 2.5G, 5G and 10G as available speeds to the netdev LED trigger.
> > 
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > Reviewed-by: Andrew Lunn <andrew@...n.ch>
> 
> So what will happen when there are more speeds? Will we create a
> separate file for each speed?
> 
> Will we have a separate sysfs file for 10, 100, 1000, 2500, 5000,
> 10000, 20000, 25000, 40000, 50000, 56000, 100000, 200000, 400000,
> 800000 ?
> 
> These are all speeds from include/uapi/linux/ethtool.h.
> 
> Maybe we should have reused ethtool link mode bits, or something...

That gets pretty ugly. The bits are not in any logical order, since
they just get appended onto the end as needed.

> Also, the files should only be present if the requested speed is
> supported by the net device. So if 2500 mbps is not supported, there
> should no be link_2500.

Yes, this would be nice. We have the information in the phy_setting
settings[] table in phy-core.c.

	 Andrew