netdev - Re: [net-next RFC PATCH 6/6] net: phy: bcm7xxx: rework phy_driver table to new multiple PHY ID format

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Message-ID: <65d3cf74.5d0a0220.d09ba.de93@mx.google.com>
Date: Mon, 19 Feb 2024 23:00:19 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Robert Marko <robimarko@...il.com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>,
	Nipun Gupta <nipun.gupta@....com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Puneet Gupta <puneet.gupta@....com>,
	Abhijit Gangurde <abhijit.gangurde@....com>,
	Umang Jain <umang.jain@...asonboard.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC PATCH 6/6] net: phy: bcm7xxx: rework phy_driver
 table to new multiple PHY ID format

On Mon, Feb 19, 2024 at 12:15:14PM -0800, Florian Fainelli wrote:
> 
> 
> On 2/19/2024 8:41 AM, Christian Marangi wrote:
> > On Sun, Feb 18, 2024 at 08:26:29PM -0800, Florian Fainelli wrote:
> > > 
> > > 
> > > On 2/18/2024 11:00 AM, Christian Marangi wrote:
> > > > Rework bcm7xxx PHY driver table to new multiple PHY format
> > > > implementation to reduce code duplication and final size of the compiled
> > > > module.
> > > 
> > > I like the idea of sharing as much code as possible and creating a smaller
> > > module, however by changing the name, you are creating an user-space ABI
> > > change, we rely upon the exact PHY name being shown under
> > > /sys/class/mdio_bus/*/* and this change will break that.
> > > 
> > 
> > Thanks for putting this concern on the table but isn't that generated by
> > dev_set_name and PHY_ID_FMT? from bus->id and addr?
> > 
> > Can't find reference of the name entry in sysfs. Am I missing something?
> > The name seems to be used only by logging to print info/err/warn.
> 
> The name will appear under /sys/ like this:
> 
> ls -ls /sys/class/mdio_bus/unimac-mdio-0/unimac-mdio-0\:01/
> total 0
>      0 lrwxrwxrwx    1 root     root             0 Jan  4 21:27 attached_dev
> -> ../../../../net/eth0
>      0 lrwxrwxrwx    1 root     root             0 Jan  4 21:27 driver ->
> ../../../../../../../../bus/mdio_bus/drivers/Broadcom BCM7712
> 
> it might be OK to change the driver, but I can tell you this is going to be
> breaking a number of our scripts here...

Thanks for the command, yes I just notice the problem and yes it's
problematic... Starting to think that the only way to have this cleanup
is to detach ops from the phy_driver struct.

Not fiding a good way to handle the name problem...

-- 
	Ansuel