linux-kernel - Re: [PATCH net-next v1 1/2] ethtool: provide UAPI for PHY Signal Quality Index (SQI)

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Message-ID: <20200519132630.GH610998@lunn.ch>
Date:   Tue, 19 May 2020 15:26:30 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Kubecek <mkubecek@...e.cz>,
        David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>, mkl@...gutronix.de,
        Marek Vasut <marex@...x.de>,
        Christian Herber <christian.herber@....com>
Subject: Re: [PATCH net-next v1 1/2] ethtool: provide UAPI for PHY Signal
 Quality Index (SQI)

On Tue, May 19, 2020 at 09:51:59AM +0200, Oleksij Rempel wrote:
> Signal Quality Index is a mandatory value required by "OPEN Alliance
> SIG" for the 100Base-T1 PHYs [1]. This indicator can be used for cable
> integrity diagnostic and investigating other noise sources and
> implement by at least two vendors: NXP[2] and TI[3].

Hi Oleksij

With a multi part patch set, please always include a cover note,
describing what the patchset as a whole does.

> +int __ethtool_get_sqi(struct net_device *dev)
> +{
> +	struct phy_device *phydev = dev->phydev;
> +
> +	if (!phydev->drv->get_sqi)
> +		return -EOPNOTSUPP;
> +
> +	return phydev->drv->get_sqi(phydev);
> +}

You are not doing any locking here, which you should. Due to modules
vs built in, it can be a bit tricky getting this right. Take a look at
how ethtool ioctl.c uses phy_ethtool_get_stats() and that inline
function itself.

    Andrew