netdev - Re: [RFC PATCH net-next v2 05/10] net: ethtool: Allow passing a phy index for some commands

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Date: Tue, 21 Nov 2023 02:08:37 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [RFC PATCH net-next v2 05/10] net: ethtool: Allow passing a phy
 index for some commands

> +	if (dev) {
> +		if (tb[ETHTOOL_A_HEADER_PHY_INDEX]) {
> +			u32 phy_index = nla_get_u32(tb[ETHTOOL_A_HEADER_PHY_INDEX]);
> +
> +			phydev = link_topo_get_phy(&dev->link_topo, phy_index);

struct phy_device *link_topo_get_phy(struct link_topology *lt, int phyindex)

We have u32 vs int here for phyindex. It would be good to have the
same type everywhere.


> +			if (!phydev) {
> +				NL_SET_ERR_MSG_ATTR(extack, header, "no phy matches phy index");
> +				return -EINVAL;
> +			}
> +		} else {
> +			/* If we need a PHY but no phy index is specified, fallback
> +			 * to dev->phydev
> +			 */
> +			phydev = dev->phydev;
> +		}
> +	}
> +
> +	req_info->phydev = phydev;

Don't forget to update Documentation/networking/ethtool-netlink.rst.

      Andrew