linux-kernel - Re: [PATCH net-next v4 4/9] net: dsa: microchip: ksz9477: add Wake on LAN support

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Message-ID: <20231017062535.GC3539182@pengutronix.de>
Date:   Tue, 17 Oct 2023 08:25:35 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v4 4/9] net: dsa: microchip: ksz9477: add Wake
 on LAN support

On Mon, Oct 16, 2023 at 04:59:24PM +0200, Andrew Lunn wrote:
> > +int ksz9477_set_wol(struct ksz_device *dev, int port,
> > +		    struct ethtool_wolinfo *wol)
> > +{
> > +	u8 pme_conf, pme_ctrl = 0;
> > +	int ret;
> > +
> > +	if (wol->wolopts & ~WAKE_PHY)
> > +		return -EINVAL;
> 
> EOPNOTSUPP might be better here. I'm assuming there is no other way
> WoL can be supported, since this is a combined MAC/PHY device. 

EOPNOTSUPP is typically returned when WoL isn’t supported at all. In
this instance, WoL is supported but an invalid option has been given.
Nonetheless, I don’t have a strong opinion on this matter currently, and
am ready to go with whichever option is recommended.

Regards,
Oleksij
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