linux-kernel - Re: [PATCH V2] net: phy: Add sysfs attribute for PHY c45 identifiers.

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Message-ID: <612d5964-6034-4188-8da5-53f3f38a25e4@lunn.ch>
Date:   Tue, 13 Jun 2023 18:18:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jianhui Zhao <zhaojh329@...il.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] net: phy: Add sysfs attribute for PHY c45 identifiers.

> +#define DEVICE_ATTR_C45_ID(i) \
> +static ssize_t \
> +phy_c45_id##i##_show(struct device *dev, \
> +	struct device_attribute *attr, char *buf) \
> +{ \
> +	struct phy_device *phydev = to_phy_device(dev); \
> +\
> +	if (!phydev->is_c45) \
> +		return 0; \
> +\
> +	return sprintf(buf, "0x%.8lx\n", \
> +		(unsigned long)phydev->c45_ids.device_ids[i]); \
> +} \

That is not the most efficient implementation.

You can have one generic

static ssize_t phy_c45_id_show(struct device *dev, char *buf, int i)
{
	struct phy_device *phydev = to_phy_device(dev);

	if (!phydev->is_c45)
		return 0;

	return sprintf(buf, "0x%.8lx\n",
		      (unsigned long)phydev->c45_ids.device_ids[i]);
}

And then your macros becomes

#define DEVICE_ATTR_C45_ID(i)			  \
static ssize_t					  \
phy_c45_id##i##_show(struct device *dev,	  \
	struct device_attribute *attr, char *buf) \
{						  \
	return phy_c45_id_show(dev, buf, i);	  \
}

	Andrew

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