linux-kernel - Re: [PATCH net-next v2 5/8] net: phy: introduce optional polling interface for PHY statistics

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Message-ID: <Z2Qgv-AqKJONvJWu@pengutronix.de>
Date: Thu, 19 Dec 2024 14:33:51 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Jonathan Corbet <corbet@....net>
Cc: kernel@...gutronix.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/8] net: phy: introduce optional polling
 interface for PHY statistics

On Thu, Dec 19, 2024 at 02:25:31PM +0100, Oleksij Rempel wrote:
> Add an optional polling interface for PHY statistics to simplify driver
> implementation. Drivers can request the PHYlib to handle the polling
> task by explicitly setting the `PHY_POLL_STATS` flag in their driver
> configuration.

The commit message is out of date. PHY_POLL_STATS should be removed.

> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
> changes v2:
> - drop PHY_POLL_STATS
> - add function comments
> ---
>  drivers/net/phy/phy.c | 20 ++++++++++++++++++++
>  include/linux/phy.h   | 21 +++++++++++++++++++++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index 107a35f402b3..7f6d304105f5 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -1442,6 +1442,23 @@ static int phy_enable_interrupts(struct phy_device *phydev)
>  	return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
>  }
>  
> +/**
> + * phy_update_stats - Update PHY device statistics if supported.
> + * @phydev: Pointer to the PHY device structure.
> + *
> + * If the PHY driver provides an update_stats callback, this function
> + * invokes it to update the PHY statistics. If not, it returns 0.
> + *
> + * Return: 0 on success, or a negative error code if the callback fails.
> + */
> +static int phy_update_stats(struct phy_device *phydev)
> +{
> +	if (!phydev->drv->update_stats)
> +		return 0;
> +
> +	return phydev->drv->update_stats(phydev);
> +}
> +
>  /**
>   * phy_request_interrupt - request and enable interrupt for a PHY device
>   * @phydev: target phy_device struct
> @@ -1511,6 +1528,9 @@ static enum phy_state_work _phy_state_machine(struct phy_device *phydev)
>  	case PHY_RUNNING:
>  		err = phy_check_link_status(phydev);
>  		func = &phy_check_link_status;
> +
> +		if (!err)
> +			err = phy_update_stats(phydev);
>  		break;
>  	case PHY_CABLETEST:
>  		err = phydev->drv->cable_test_get_status(phydev, &finished);
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index e1554ac16ce2..b3e4a164bfb7 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -1180,6 +1180,24 @@ struct phy_driver {
>  	 */
>  	void (*get_link_stats)(struct phy_device *dev,
>  			       struct ethtool_link_ext_stats *link_stats);
> +
> +	/**
> +	 * update_stats - Trigger periodic statistics updates.
> +	 * @dev: The PHY device for which statistics updates are triggered.
> +	 *
> +	 * Periodically gathers statistics from the PHY device to update locally
> +	 * maintained 64-bit counters. This is necessary for PHYs that implement
> +	 * reduced-width counters (e.g., 16-bit or 32-bit) which can overflow
> +	 * more frequently compared to 64-bit counters. By invoking this
> +	 * callback, drivers can fetch the current counter values, handle
> +	 * overflow detection, and accumulate the results into local 64-bit
> +	 * counters for accurate reporting through the `get_phy_stats` and
> +	 * `get_link_stats` interfaces.
> +	 *
> +	 * Return: 0 on success or a negative error code on failure.
> +	 */
> +	int (*update_stats)(struct phy_device *dev);
> +
>  	/** @get_sset_count: Number of statistic counters */
>  	int (*get_sset_count)(struct phy_device *dev);
>  	/** @get_strings: Names of the statistic counters */
> @@ -1670,6 +1688,9 @@ static inline bool phy_polling_mode(struct phy_device *phydev)
>  		if (phydev->drv->flags & PHY_POLL_CABLE_TEST)
>  			return true;
>  
> +	if (phydev->drv->update_stats)
> +		return true;
> +
>  	return phydev->irq == PHY_POLL;
>  }
>  
> -- 
> 2.39.5
> 
> 

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