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Message-Id: <20240302195306.3207716-5-o.rempel@pengutronix.de>
Date: Sat, 2 Mar 2024 20:53:03 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Wei Fang <wei.fang@....com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
Oleksij Rempel <o.rempel@...gutronix.de>,
kernel@...gutronix.de,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
Shenwei Wang <shenwei.wang@....com>,
Clark Wang <xiaoning.wang@....com>,
NXP Linux Team <linux-imx@....com>
Subject: [PATCH net-next v9 4/7] net: phy: Immediately call adjust_link if only tx_lpi_enabled changes
From: Andrew Lunn <andrew@...n.ch>
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 <andrew@...n.ch>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
v6: remove ' comment and parenthesis or return
v7: - add phy_link_down() before phy_link_up()
- rewrite comment for phy_ethtool_set_eee_noneg()
- add check for changed tx_lpi_timer
v8: update phydev->link value before phy_link_down/up
---
drivers/net/phy/phy-c45.c | 14 ++++++++++++--
drivers/net/phy/phy.c | 40 ++++++++++++++++++++++++++++++++++++---
2 files changed, 49 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 95c4ef5d4e97f..c3a0a5ee5f116 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;
@@ -1659,6 +1660,36 @@ 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(&phydev->eee_cfg, data);
+ phydev->enable_tx_lpi = eeecfg_mac_can_tx_lpi(&phydev->eee_cfg);
+ if (phydev->link) {
+ phydev->link = false;
+ phy_link_down(phydev);
+ phydev->link = true;
+ phy_link_up(phydev);
+ }
+ }
+}
+
/**
* phy_ethtool_set_eee - set EEE supported and status
* @phydev: target phy_device struct
@@ -1675,11 +1706,14 @@ 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(&phydev->eee_cfg, data);
+ }
mutex_unlock(&phydev->lock);
- return ret;
+ return ret < 0 ? ret : 0;
}
EXPORT_SYMBOL(phy_ethtool_set_eee);
--
2.39.2
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