linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with phy_*

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Date: Mon, 22 Jan 2024 15:30:20 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Tim Menninger <tmenninger@...estorage.com>, f.fainelli@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with
 phy_*_c45 callbacks

On Mon, Jan 22, 2024 at 02:33:49PM +0200, Vladimir Oltean wrote:
> On Tue, Jan 16, 2024 at 05:51:13PM -0800, Tim Menninger wrote:
> > My impression is still that the read_c45 function should agree with the
> > phy_read_c45 function, but that isn't a hill I care to die on if you still
> > think otherwise. Thoughts?
> 
> FWIW, Tim's approach is consistent with what drivers/net/mdio/mdio-mux.c does.
> 
> 		if (parent_bus->read)
> 			cb->mii_bus->read = mdio_mux_read;
> 		if (parent_bus->write)
> 			cb->mii_bus->write = mdio_mux_write;
> 		if (parent_bus->read_c45)
> 			cb->mii_bus->read_c45 = mdio_mux_read_c45;
> 		if (parent_bus->write_c45)
> 			cb->mii_bus->write_c45 = mdio_mux_write_c45;
> 
> My only objection to his patch (apart from the commit message which
> should indeed be more detailed) is that I would have preferred the same
> "if" syntax rather than the use of a ternary operator with NULL.

I agree it could be fixed this way. But what i don't like about the
current code is how C22 and C45 do different things with error
codes. Since the current code is trying to use an error code, i would
prefer to fix that error code handling, rather than swap to a
different way to indicate its not supported.

	  Andrew