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Message-ID: <ZClwVbl8HeCxcHXa@corigine.com>
Date: Sun, 2 Apr 2023 14:08:53 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>,
Russell King - ARM Linux <linux@...linux.org.uk>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 6/7] net: phy: smsc: add edpd tunable support
On Sun, Apr 02, 2023 at 11:47:34AM +0200, Heiner Kallweit wrote:
> This adds support for the EDPD PHY tunable.
> Per default EDPD is disabled in interrupt mode, the tunable can be used
> to override this, e.g. if the link partner doesn't use EDPD.
> The interval to check for energy can be chosen between 1000ms and
> 2000ms. Note that this value consists of the 1000ms phylib interval
> for state machine runs plus the time to wait for energy being detected.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
> drivers/net/phy/smsc.c | 82 +++++++++++++++++++++++++++++++++++++++++
> include/linux/smscphy.h | 4 ++
> 2 files changed, 86 insertions(+)
>
> diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
> index 0cd433f01..cca5bf46f 100644
> --- a/drivers/net/phy/smsc.c
> +++ b/drivers/net/phy/smsc.c
> @@ -34,6 +34,8 @@
> #define SPECIAL_CTRL_STS_AMDIX_STATE_ 0x2000
>
> #define EDPD_MAX_WAIT_DFLT 640
nit: Maybe this could be EDPD_MAX_WAIT_DFLT_MS for consistency
with PHY_STATE_MACH_MS.
> +/* interval between phylib state machine runs in ms */
> +#define PHY_STATE_MACH_MS 1000
>
> struct smsc_hw_stat {
> const char *string;
> @@ -295,6 +297,86 @@ static void smsc_get_stats(struct phy_device *phydev,
> data[i] = smsc_get_stat(phydev, i);
> }
>
> +static int smsc_phy_get_edpd(struct phy_device *phydev, u16 *edpd)
> +{
> + struct smsc_phy_priv *priv = phydev->priv;
> +
> + if (!priv)
> + return -EOPNOTSUPP;
> +
> + if (!priv->edpd_enable)
> + *edpd = ETHTOOL_PHY_EDPD_DISABLE;
> + else if (!priv->edpd_max_wait_ms)
> + *edpd = ETHTOOL_PHY_EDPD_NO_TX;
> + else
> + *edpd = PHY_STATE_MACH_MS + priv->edpd_max_wait_ms;
> +
> + return 0;
> +}
> +
> +static int smsc_phy_set_edpd(struct phy_device *phydev, u16 edpd)
> +{
> + struct smsc_phy_priv *priv = phydev->priv;
> + int ret;
> +
> + if (!priv)
> + return -EOPNOTSUPP;
> +
> + mutex_lock(&phydev->lock);
I am a little confused by this as by my reasoning this code is called via
the first arm of the following in set_phy_tunable(), and phydev->lock is
already held.
if (phy_drv_tunable) {
mutex_lock(&phydev->lock);
ret = phydev->drv->set_tunable(phydev, &tuna, data);
mutex_unlock(&phydev->lock);
} else {
ret = dev->ethtool_ops->set_phy_tunable(dev, &tuna, data);
}
> +
> + switch (edpd) {
> + case ETHTOOL_PHY_EDPD_DISABLE:
> + priv->edpd_enable = false;
> + break;
> + case ETHTOOL_PHY_EDPD_NO_TX:
> + priv->edpd_enable = true;
> + priv->edpd_max_wait_ms = 0;
> + break;
> + case ETHTOOL_PHY_EDPD_DFLT_TX_MSECS:
> + edpd = PHY_STATE_MACH_MS + EDPD_MAX_WAIT_DFLT;
> + fallthrough;
> + default:
> + if (phydev->irq != PHY_POLL)
> + return -EOPNOTSUPP;
This returns without releasing phydev->lock.
Is that intended?
> + if (edpd < PHY_STATE_MACH_MS || edpd > PHY_STATE_MACH_MS + 1000)
> + return -EINVAL;
Ditto.
> + priv->edpd_enable = true;
> + priv->edpd_max_wait_ms = edpd - PHY_STATE_MACH_MS;
> + }
> +
> + priv->edpd_mode_set_by_user = true;
> +
> + ret = smsc_phy_config_edpd(phydev);
> +
> + mutex_unlock(&phydev->lock);
> +
> + return ret;
> +}
> +
> +int smsc_phy_get_tunable(struct phy_device *phydev,
> + struct ethtool_tunable *tuna, void *data)
> +{
> + switch (tuna->id) {
> + case ETHTOOL_PHY_EDPD:
> + return smsc_phy_get_edpd(phydev, data);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +EXPORT_SYMBOL_GPL(smsc_phy_get_tunable);
> +
> +int smsc_phy_set_tunable(struct phy_device *phydev,
> + struct ethtool_tunable *tuna, const void *data)
> +{
> + switch (tuna->id) {
> + case ETHTOOL_PHY_EDPD:
> + return smsc_phy_set_edpd(phydev, *(u16 *)data);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +EXPORT_SYMBOL_GPL(smsc_phy_set_tunable);
> +
> int smsc_phy_probe(struct phy_device *phydev)
> {
> struct device *dev = &phydev->mdio.dev;
> diff --git a/include/linux/smscphy.h b/include/linux/smscphy.h
> index 80f37c1db..e1c886277 100644
> --- a/include/linux/smscphy.h
> +++ b/include/linux/smscphy.h
> @@ -32,6 +32,10 @@ int smsc_phy_config_intr(struct phy_device *phydev);
> irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev);
> int smsc_phy_config_init(struct phy_device *phydev);
> int lan87xx_read_status(struct phy_device *phydev);
> +int smsc_phy_get_tunable(struct phy_device *phydev,
> + struct ethtool_tunable *tuna, void *data);
> +int smsc_phy_set_tunable(struct phy_device *phydev,
> + struct ethtool_tunable *tuna, const void *data);
> int smsc_phy_probe(struct phy_device *phydev);
>
> #endif /* __LINUX_SMSCPHY_H__ */
> --
> 2.40.0
>
>
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