netdev - Re: [PATCH net-next v2 1/6] net: dsa: add support for phylink mac_select

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Date:   Sat, 19 Feb 2022 23:22:24 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     Ansuel Smith <ansuelsmth@...il.com>, Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next v2 1/6] net: dsa: add support for phylink
 mac_select_pcs()

On Sat, Feb 19, 2022 at 11:12:41PM +0200, Vladimir Oltean wrote:
> >  static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
> >  	.validate = dsa_port_phylink_validate,
> > +	.mac_select_pcs = dsa_port_phylink_mac_select_pcs,
> 
> This patch breaks probing on DSA switch drivers that weren't converted
> to supported_interfaces, due to this check in phylink_create():

And this is only the most superficial layer of breakage. Everywhere in
phylink.c where pl->mac_ops->mac_select_pcs() is used, its presence is
checked and non-zero return codes from it are treated as hard errors,
even -EOPNOTSUPP, even if this particular error code is probably
intended to behave identically as the absence of the function pointer,
for compatibility.