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The commit message is out of date.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@pengutronix.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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