[PATCH net-next 2/2] net: dsa: mt7530: add support for bridge port isolation

[Matthias Schiffer]

Remove a pair of ports from the port matrix when both ports have the
isolated flag set.

Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
---
 drivers/net/dsa/mt7530.c | 21 ++++++++++++++++++---
 drivers/net/dsa/mt7530.h |  1 +
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index ecacaefdd694..44939379aba8 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1303,7 +1303,8 @@ mt7530_stp_state_set(struct dsa_switch *ds, int port, u8 state)
 }
 
 static void mt7530_update_port_member(struct mt7530_priv *priv, int port,
-				      const struct net_device *bridge_dev, bool join)
+				      const struct net_device *bridge_dev,
+				      bool join)
 	__must_hold(&priv->reg_mutex)
 {
 	struct dsa_port *dp = dsa_to_port(priv->ds, port), *other_dp;
@@ -1311,6 +1312,7 @@ static void mt7530_update_port_member(struct mt7530_priv *priv, int port,
 	struct dsa_port *cpu_dp = dp->cpu_dp;
 	u32 port_bitmap = BIT(cpu_dp->index);
 	int other_port;
+	bool isolated;
 
 	dsa_switch_for_each_user_port(other_dp, priv->ds) {
 		other_port = other_dp->index;
@@ -1327,7 +1329,9 @@ static void mt7530_update_port_member(struct mt7530_priv *priv, int port,
 		if (!dsa_port_offloads_bridge_dev(other_dp, bridge_dev))
 			continue;
 
-		if (join) {
+		isolated = p->isolated && other_p->isolated;
+
+		if (join && !isolated) {
 			other_p->pm |= PCR_MATRIX(BIT(port));
 			port_bitmap |= BIT(other_port);
 		} else {
@@ -1352,7 +1356,7 @@ mt7530_port_pre_bridge_flags(struct dsa_switch *ds, int port,
 			     struct netlink_ext_ack *extack)
 {
 	if (flags.mask & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
-			   BR_BCAST_FLOOD))
+			   BR_BCAST_FLOOD | BR_ISOLATED))
 		return -EINVAL;
 
 	return 0;
@@ -1381,6 +1385,17 @@ mt7530_port_bridge_flags(struct dsa_switch *ds, int port,
 		mt7530_rmw(priv, MT753X_MFC, BC_FFP(BIT(port)),
 			   flags.val & BR_BCAST_FLOOD ? BC_FFP(BIT(port)) : 0);
 
+	if (flags.mask & BR_ISOLATED) {
+		struct dsa_port *dp = dsa_to_port(ds, port);
+		struct net_device *bridge_dev = dsa_port_bridge_dev_get(dp);
+
+		priv->ports[port].isolated = !!(flags.val & BR_ISOLATED);
+
+		mutex_lock(&priv->reg_mutex);
+		mt7530_update_port_member(priv, port, bridge_dev, true);
+		mutex_unlock(&priv->reg_mutex);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 2ea4e24628c6..28592123070b 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -721,6 +721,7 @@ struct mt7530_fdb {
  */
 struct mt7530_port {
 	bool enable;
+	bool isolated;
 	u32 pm;
 	u16 pvid;
 	struct phylink_pcs *sgmii_pcs;
-- 
2.45.2