linux-kernel - [PATCH net-next v6 1/9] net: dsa: microchip: enable EEE support

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Date:   Wed,  8 Feb 2023 11:32:03 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Wei Fang <wei.fang@....com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com
Subject: [PATCH net-next v6 1/9] net: dsa: microchip: enable EEE support

Some of KSZ9477 family switches provides EEE support. To enable it, we
just need to register set_mac_eee/set_mac_eee handlers and validate
supported chip version and port.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/dsa/microchip/ksz_common.c | 65 ++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 46becc0382d6..0a2d78253d17 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2673,6 +2673,69 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
 	return -EOPNOTSUPP;
 }
 
+static int ksz_validate_eee(struct dsa_switch *ds, int port)
+{
+	struct ksz_device *dev = ds->priv;
+
+	if (!dev->info->internal_phy[port])
+		return -EOPNOTSUPP;
+
+	switch (dev->chip_id) {
+	case KSZ8563_CHIP_ID:
+	case KSZ9477_CHIP_ID:
+	case KSZ9563_CHIP_ID:
+	case KSZ9567_CHIP_ID:
+	case KSZ9893_CHIP_ID:
+	case KSZ9896_CHIP_ID:
+	case KSZ9897_CHIP_ID:
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
+			   struct ethtool_eee *e)
+{
+	int ret;
+
+	ret = ksz_validate_eee(ds, port);
+	if (ret)
+		return ret;
+
+	/* There is no documented control of Tx LPI configuration. */
+	e->tx_lpi_enabled = true;
+	/* There is no documented control of Tx LPI timer. According to tests
+	 * Tx LPI timer seems to be set by default to minimal value.
+	 */
+	e->tx_lpi_timer = 0;
+
+	return 0;
+}
+
+static int ksz_set_mac_eee(struct dsa_switch *ds, int port,
+			   struct ethtool_eee *e)
+{
+	struct ksz_device *dev = ds->priv;
+	int ret;
+
+	ret = ksz_validate_eee(ds, port);
+	if (ret)
+		return ret;
+
+	if (!e->tx_lpi_enabled) {
+		dev_err(dev->dev, "Disabling EEE Tx LPI is not supported\n");
+		return -EINVAL;
+	}
+
+	if (e->tx_lpi_timer) {
+		dev_err(dev->dev, "Setting EEE Tx LPI timer is not supported\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static void ksz_set_xmii(struct ksz_device *dev, int port,
 			 phy_interface_t interface)
 {
@@ -3130,6 +3193,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
 	.port_txtstamp		= ksz_port_txtstamp,
 	.port_rxtstamp		= ksz_port_rxtstamp,
 	.port_setup_tc		= ksz_setup_tc,
+	.get_mac_eee		= ksz_get_mac_eee,
+	.set_mac_eee		= ksz_set_mac_eee,
 };
 
 struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
-- 
2.30.2