[PATCH net-next v2] net: dsa: mt7530: add support for changing DSA master

[Richard van Schagen]

Add support for changing the master of a port on the MT7530 DSA subdriver.


Tested-by: Arınç ÜNAL <arinc.unal at arinc9.com>
Signed-off-by: Richard van Schagen <richard at routerhints.com>
Signed-off-by: Arınç ÜNAL <arinc.unal at arinc9.com>
---
 drivers/net/dsa/mt7530.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index b5ad4b4fc00c..2374166c4858 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1072,6 +1072,35 @@ mt7530_port_disable(struct dsa_switch *ds, int port)
 	mutex_unlock(&priv->reg_mutex);
 }
 
+static int
+mt7530_port_change_master(struct dsa_switch *ds, int port,
+			  struct net_device *master,
+			  struct netlink_ext_ack *extack)
+{
+	struct mt7530_priv *priv = ds->priv;
+	struct dsa_port *dp = dsa_to_port(ds, port);
+	struct dsa_port *cpu_dp = master->dsa_ptr;
+
+	if (netif_is_lag_master(master)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "LAG DSA master not supported");
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&priv->reg_mutex);
+
+	/* Move old to new cpu on User port */
+	priv->ports[port].pm &= ~PCR_MATRIX(BIT(dp->cpu_dp->index));
+	priv->ports[port].pm |= PCR_MATRIX(BIT(cpu_dp->index));
+
+	mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK,
+		   priv->ports[port].pm);
+
+	mutex_unlock(&priv->reg_mutex);
+
+	return 0;
+}
+
 static int
 mt7530_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
 {
@@ -3157,6 +3186,7 @@ static const struct dsa_switch_ops mt7530_switch_ops = {
 	.set_ageing_time	= mt7530_set_ageing_time,
 	.port_enable		= mt7530_port_enable,
 	.port_disable		= mt7530_port_disable,
+	.port_change_master	= mt7530_port_change_master,
 	.port_change_mtu	= mt7530_port_change_mtu,
 	.port_max_mtu		= mt7530_port_max_mtu,
 	.port_stp_state_set	= mt7530_stp_state_set,
-- 
2.30.2