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

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Date:   Fri, 8 Dec 2023 07:58:04 +0100
From:   Marek Behún <kabel@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
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, 7 Dec 2023 18:11:29 +0100
Andrew Lunn <andrew@...n.ch> wrote:

> 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.

What if the netdev does not have a PHY? The MAC also has speed
information. Maybe create a function
  bool dev_supports_speed(netdev, speed)
?

Marek