From: Andrew Lunn <[email protected]>
The MAC driver changes its EEE hardware configuration in its
adjust_link callback. This is called when auto-neg
completes. Disabling EEE via eee_enabled false will trigger an
autoneg, and as a result the adjust_link callback will be called with
phydev->enable_tx_lpi set to false. Similarly, eee_enabled set to true
and with a change of advertised link modes will result in a new
autoneg, and a call the adjust_link call.
If set_eee is called with only a change to tx_lpi_enabled which does
not trigger an auto-neg, it is necessary to call the adjust_link
callback so that the MAC is reconfigured to take this change into
account.
When setting phydev->enable_tx_lpi, take both eee_enabled and
tx_lpi_enabled into account, so the MAC drivers just needs to act on
phydev->enable_tx_lpi and not the whole EEE configuration.
The same check should be done for tx_lpi_timer too.
Signed-off-by: Andrew Lunn <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Oleksij Rempel <[email protected]>
---
v7: remove ' comment and parenthesis or return
v8: - add phy_link_down() before phy_link_up()
- rewrite comment for phy_ethtool_set_eee_noneg()
- add check for changed tx_lpi_timer
---
drivers/net/phy/phy-c45.c | 14 ++++++++++++--
drivers/net/phy/phy.c | 38 +++++++++++++++++++++++++++++++++++---
2 files changed, 47 insertions(+), 5 deletions(-)
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 3e95b8a15f442..5695935fdce97 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -1550,6 +1550,8 @@ EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);
* advertised, but the previously advertised link modes are
* retained. This allows EEE to be enabled/disabled in a
* non-destructive way.
+ * Returns either error code, 0 if there was no change, or positive
+ * value if there was a change which triggered auto-neg.
*/
int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
struct ethtool_keee *data)
@@ -1576,8 +1578,16 @@ int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
phydev->eee_enabled = data->eee_enabled;
ret = genphy_c45_an_config_eee_aneg(phydev);
- if (ret > 0)
- return phy_restart_aneg(phydev);
+ if (ret > 0) {
+ ret = phy_restart_aneg(phydev);
+ if (ret < 0)
+ return ret;
+
+ /* explicitly return 1, otherwise (ret > 0) value will be
+ * overwritten by phy_restart_aneg().
+ */
+ return 1;
+ }
return ret;
}
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index f0ed07c74a36e..8216061ff0e34 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -988,7 +988,8 @@ static int phy_check_link_status(struct phy_device *phydev)
if (err < 0)
phydev->enable_tx_lpi = false;
else
- phydev->enable_tx_lpi = !!err;
+ phydev->enable_tx_lpi = (err & phydev->eee_cfg.tx_lpi_enabled);
+
phy_link_up(phydev);
} else if (!phydev->link && phydev->state != PHY_NOLINK) {
phydev->state = PHY_NOLINK;
@@ -1679,6 +1680,34 @@ int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_keee *data)
}
EXPORT_SYMBOL(phy_ethtool_get_eee);
+/**
+ * phy_ethtool_set_eee_noneg - Adjusts MAC LPI configuration without PHY
+ * renegotiation
+ * @phydev: pointer to the target PHY device structure
+ * @data: pointer to the ethtool_keee structure containing the new EEE settings
+ *
+ * This function updates the Energy Efficient Ethernet (EEE) configuration
+ * for cases where only the MAC's Low Power Idle (LPI) configuration changes,
+ * without triggering PHY renegotiation. It ensures that the MAC is properly
+ * informed of the new LPI settings by cycling the link down and up, which
+ * is necessary for the MAC to adopt the new configuration. This adjustment
+ * is done only if there is a change in the tx_lpi_enabled or tx_lpi_timer
+ * configuration.
+ */
+static void phy_ethtool_set_eee_noneg(struct phy_device *phydev,
+ struct ethtool_keee *data)
+{
+ if (phydev->eee_cfg.tx_lpi_enabled != data->tx_lpi_enabled ||
+ phydev->eee_cfg.tx_lpi_timer != data->tx_lpi_timer) {
+ eee_to_eeecfg(data, &phydev->eee_cfg);
+ phydev->enable_tx_lpi = eeecfg_mac_can_tx_lpi(&phydev->eee_cfg);
+ if (phydev->link) {
+ phy_link_down(phydev);
+ phy_link_up(phydev);
+ }
+ }
+}
+
/**
* phy_ethtool_set_eee - set EEE supported and status
* @phydev: target phy_device struct
@@ -1695,11 +1724,14 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_keee *data)
mutex_lock(&phydev->lock);
ret = genphy_c45_ethtool_set_eee(phydev, data);
- if (!ret)
+ if (ret >= 0) {
+ if (ret == 0)
+ phy_ethtool_set_eee_noneg(phydev, data);
eee_to_eeecfg(data, &phydev->eee_cfg);
+ }
mutex_unlock(&phydev->lock);
- return ret;
+ return ret < 0 ? ret : 0;
}
EXPORT_SYMBOL(phy_ethtool_set_eee);
--
2.39.2
On Thu, Feb 29, 2024 at 03:07:57PM +0100, Oleksij Rempel wrote:
> +static void phy_ethtool_set_eee_noneg(struct phy_device *phydev,
> + struct ethtool_keee *data)
> +{
> + if (phydev->eee_cfg.tx_lpi_enabled != data->tx_lpi_enabled ||
> + phydev->eee_cfg.tx_lpi_timer != data->tx_lpi_timer) {
> + eee_to_eeecfg(data, &phydev->eee_cfg);
> + phydev->enable_tx_lpi = eeecfg_mac_can_tx_lpi(&phydev->eee_cfg);
> + if (phydev->link) {
> + phy_link_down(phydev);
> + phy_link_up(phydev);
Unfortunately, this isn't sufficient in all cases. Phylink will be fine
with this though.
If we take a look at fec_enet_adjust_link(), then we can see it tests
phydev->link directly (which it has to, because there's nothing else
to determine whether the link is up or down. FEC will cope with its
fec_enet_adjust_link() being called with no changes however.
In order to properly resolve this, I think we need:
if (phydev->link) {
phydev->link = false;
phy_link_down(phydev);
phydev->link = true;
phy_link_up(phydev);
to properly avoid the issue I've referred to.
--
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