netdev - Re: [PATCH net-next v4 02/13] net: phy: Use an internal, searchable storage for the linkmodes

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Message-ID: <738bd67c-8688-4902-805f-4e35e6aaed4a@redhat.com>
Date: Thu, 6 Mar 2025 09:30:11 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>, davem@...emloft.net,
 Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Russell King <linux@...linux.org.uk>,
 Heiner Kallweit <hkallweit1@...il.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 thomas.petazzoni@...tlin.com, linux-arm-kernel@...ts.infradead.org,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>,
 Oleksij Rempel <o.rempel@...gutronix.de>, Simon Horman <horms@...nel.org>,
 Romain Gantois <romain.gantois@...tlin.com>
Subject: Re: [PATCH net-next v4 02/13] net: phy: Use an internal, searchable
 storage for the linkmodes

On 3/3/25 10:03 AM, Maxime Chevallier wrote:
[...]
> +static int speed_duplex_to_capa(int speed, unsigned int duplex)
> +{
> +	if (duplex == DUPLEX_UNKNOWN ||
> +	    (speed > SPEED_1000 && duplex != DUPLEX_FULL))
> +		return -EINVAL;
> +
> +	switch (speed) {
> +	case SPEED_10: return duplex == DUPLEX_FULL ?
> +			      LINK_CAPA_10FD : LINK_CAPA_10HD;
> +	case SPEED_100: return duplex == DUPLEX_FULL ?
> +			       LINK_CAPA_100FD : LINK_CAPA_100HD;
> +	case SPEED_1000: return duplex == DUPLEX_FULL ?
> +				LINK_CAPA_1000FD : LINK_CAPA_1000HD;
> +	case SPEED_2500: return LINK_CAPA_2500FD;
> +	case SPEED_5000: return LINK_CAPA_5000FD;
> +	case SPEED_10000: return LINK_CAPA_10000FD;
> +	case SPEED_20000: return LINK_CAPA_20000FD;
> +	case SPEED_25000: return LINK_CAPA_25000FD;
> +	case SPEED_40000: return LINK_CAPA_40000FD;
> +	case SPEED_50000: return LINK_CAPA_50000FD;
> +	case SPEED_56000: return LINK_CAPA_56000FD;
> +	case SPEED_100000: return LINK_CAPA_100000FD;
> +	case SPEED_200000: return LINK_CAPA_200000FD;
> +	case SPEED_400000: return LINK_CAPA_400000FD;
> +	case SPEED_800000: return LINK_CAPA_800000FD;
> +	}
> +

What about adding some code here to help future patch updating LINK_CAPA
definition as needed?

Something alike:

	pr_err_once("Unknown speed %d, please update LINK_CAPS\n", speed);


> +	return -EINVAL;
> +}
> +
> +/**
> + * phy_caps_init() - Initializes the link_caps array from the link_mode_params.
> + */
> +void phy_caps_init(void)
> +{
> +	const struct link_mode_info *linkmode;
> +	int i, capa;
> +
> +	/* Fill the caps array from net/ethtool/common.c */
> +	for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
> +		linkmode = &link_mode_params[i];
> +		capa = speed_duplex_to_capa(linkmode->speed, linkmode->duplex);
> +
> +		if (capa < 0)
> +			continue;

Or even error-out here.

/P