linux-kernel - Re: [RFC net-next] net: phy: at803x: add cable diagnostics support

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Date:   Tue, 5 May 2020 15:07:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [RFC net-next] net: phy: at803x: add cable diagnostics support

> +static int at803x_cable_test_get_status(struct phy_device *phydev,
> +					bool *finished)
> +{
> +	struct at803x_priv *priv = phydev->priv;
> +	static const int ethtool_pair[] = {
> +		ETHTOOL_A_CABLE_PAIR_0, ETHTOOL_A_CABLE_PAIR_1,
> +		ETHTOOL_A_CABLE_PAIR_2, ETHTOOL_A_CABLE_PAIR_3};

If you put one per line, you will keep the reverse christmas tree, and
David will be happy.

> +	int pair, val, ret;
> +	unsigned int delay_ms;

Well, David will be happy if you move this as well.

> +	*finished = false;
> +
> +	if (priv->cdt_start) {
> +		delay_ms = AT803X_CDT_DELAY_MS;
> +		delay_ms -= jiffies_delta_to_msecs(jiffies - priv->cdt_start);
> +		if (delay_ms > 0)
> +			msleep(delay_ms);
> +	}
> +
> +	for (pair = 0; pair < 4; pair++) {
> +		ret = at803x_cdt_start(phydev, pair);
> +		if (ret)
> +			return ret;
> +
> +		ret = at803x_cdt_wait_for_completion(phydev);
> +		if (ret)
> +			return ret;
> +
> +		val = phy_read(phydev, AT803X_CDT_STATUS);
> +		if (val < 0)
> +			return val;
> +
> +		ethnl_cable_test_result(phydev, ethtool_pair[pair],
> +					at803x_cdt_test_result(val));
> +
> +		if (at803x_cdt_fault_length_valid(val))
> +			continue;

The name is not very intuitive. It return false if it is valid?

Otherwise, this looks good.

    Andrew