netdev - [PATCH 3/4] net: dsa: mv88e6xxx: Implement .port_change_mtu/.port_max

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Date:   Thu, 23 Jul 2020 15:59:41 +1200
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH 3/4] net: dsa: mv88e6xxx: Implement .port_change_mtu/.port_max_mtu

Add implementations for the mv88e6xxx switches to connect with the
generic dsa operations for configuring the port MTU.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index c2a4ac99545d..04e4a7291d14 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2841,6 +2841,30 @@ static int mv88e6xxx_devlink_param_set(struct dsa_switch *ds, u32 id,
 	return err;
 }
 
+static int mv88e6xxx_port_change_mtu(struct dsa_switch *ds, int port,
+				     int new_mtu)
+{
+	struct mv88e6xxx_chip *chip = ds->priv;
+	int err = -EOPNOTSUPP;
+
+	mv88e6xxx_reg_lock(chip);
+	if (chip->info->ops->port_set_jumbo_size)
+		err = chip->info->ops->port_set_jumbo_size(chip, port, new_mtu);
+	mv88e6xxx_reg_unlock(chip);
+
+	return err;
+}
+
+static int mv88e6xxx_port_max_mtu(struct dsa_switch *ds, int port)
+{
+	struct mv88e6xxx_chip *chip = ds->priv;
+
+	if (chip->info->ops->port_set_jumbo_size)
+		return 10240;
+
+	return 1518;
+}
+
 static const struct devlink_param mv88e6xxx_devlink_params[] = {
 	DSA_DEVLINK_PARAM_DRIVER(MV88E6XXX_DEVLINK_PARAM_ID_ATU_HASH,
 				 "ATU_hash", DEVLINK_PARAM_TYPE_U8,
@@ -5562,6 +5586,8 @@ static const struct dsa_switch_ops mv88e6xxx_switch_ops = {
 	.get_ts_info		= mv88e6xxx_get_ts_info,
 	.devlink_param_get	= mv88e6xxx_devlink_param_get,
 	.devlink_param_set	= mv88e6xxx_devlink_param_set,
+	.port_change_mtu	= mv88e6xxx_port_change_mtu,
+	.port_max_mtu		= mv88e6xxx_port_max_mtu,
 };
 
 static int mv88e6xxx_register_switch(struct mv88e6xxx_chip *chip)
-- 
2.27.0