mlxsw: Make EtherType configurable when pushing VLAN at ingress

Currently, when pushing a PVID at ingress, mlxsw always uses 802.1q
EtherType.

Make this EtherType configurable by extending mlxsw_sp_port_pvid_set()
with an EtherType argument.

This is a preparation for QinQ support, that needs to push a PVID with
802.1ad EtherType.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -851,11 +851,13 @@ MLXSW_ITEM32(reg, spvid, et_vlan, 0x04, 16, 2);
  */
 MLXSW_ITEM32(reg, spvid, pvid, 0x04, 0, 12);
 
-static inline void mlxsw_reg_spvid_pack(char *payload, u8 local_port, u16 pvid)
+static inline void mlxsw_reg_spvid_pack(char *payload, u8 local_port, u16 pvid,
+					u8 et_vlan)
 {
 	MLXSW_REG_ZERO(spvid, payload);
 	mlxsw_reg_spvid_local_port_set(payload, local_port);
 	mlxsw_reg_spvid_pvid_set(payload, pvid);
+	mlxsw_reg_spvid_et_vlan_set(payload, et_vlan);
 }
 
 /* SPVM - Switch Port VLAN Membership

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -384,13 +384,37 @@ int mlxsw_sp_port_vid_learning_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 	return err;
 }
 
+static int mlxsw_sp_ethtype_to_sver_type(u16 ethtype, u8 *p_sver_type)
+{
+	switch (ethtype) {
+	case ETH_P_8021Q:
+		*p_sver_type = 0;
+		break;
+	case ETH_P_8021AD:
+		*p_sver_type = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int __mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port,
-				    u16 vid)
+				    u16 vid, u16 ethtype)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 	char spvid_pl[MLXSW_REG_SPVID_LEN];
+	u8 sver_type;
+	int err;
+
+	err = mlxsw_sp_ethtype_to_sver_type(ethtype, &sver_type);
+	if (err)
+		return err;
+
+	mlxsw_reg_spvid_pack(spvid_pl, mlxsw_sp_port->local_port, vid,
+			     sver_type);
 
-	mlxsw_reg_spvid_pack(spvid_pl, mlxsw_sp_port->local_port, vid);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(spvid), spvid_pl);
 }
 
@@ -404,7 +428,8 @@ static int mlxsw_sp_port_allow_untagged_set(struct mlxsw_sp_port *mlxsw_sp_port,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(spaft), spaft_pl);
 }
 
-int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid)
+int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
+			   u16 ethtype)
 {
 	int err;
 
@@ -413,7 +438,7 @@ int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid)
 		if (err)
 			return err;
 	} else {
-		err = __mlxsw_sp_port_pvid_set(mlxsw_sp_port, vid);
+		err = __mlxsw_sp_port_pvid_set(mlxsw_sp_port, vid, ethtype);
 		if (err)
 			return err;
 		err = mlxsw_sp_port_allow_untagged_set(mlxsw_sp_port, true);
@@ -425,7 +450,7 @@ int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid)
 	return 0;
 
 err_port_allow_untagged_set:
-	__mlxsw_sp_port_pvid_set(mlxsw_sp_port, mlxsw_sp_port->pvid);
+	__mlxsw_sp_port_pvid_set(mlxsw_sp_port, mlxsw_sp_port->pvid, ethtype);
 	return err;
 }
 
@@ -1588,7 +1613,8 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 		goto err_port_nve_init;
 	}
 
-	err = mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID);
+	err = mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID,
+				     ETH_P_8021Q);
 	if (err) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to set PVID\n",
 			mlxsw_sp_port->local_port);
@@ -3644,7 +3670,8 @@ static void mlxsw_sp_port_lag_leave(struct mlxsw_sp_port *mlxsw_sp_port,
 	lag->ref_count--;
 
 	/* Make sure untagged frames are allowed to ingress */
-	mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID);
+	mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID,
+			       ETH_P_8021Q);
 }
 
 static int mlxsw_sp_lag_dist_port_add(struct mlxsw_sp_port *mlxsw_sp_port,

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -580,7 +580,8 @@ int mlxsw_sp_port_vid_stp_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 int mlxsw_sp_port_vp_mode_set(struct mlxsw_sp_port *mlxsw_sp_port, bool enable);
 int mlxsw_sp_port_vid_learning_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 				   bool learn_enable);
-int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid);
+int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
+			   u16 ethtype);
 struct mlxsw_sp_port_vlan *
 mlxsw_sp_port_vlan_create(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid);
 void mlxsw_sp_port_vlan_destroy(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan);

drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c

@@ -1129,6 +1129,7 @@ mlxsw_sp_bridge_port_vlan_add(struct mlxsw_sp_port *mlxsw_sp_port,
 	u16 pvid = mlxsw_sp_port_pvid_determine(mlxsw_sp_port, vid, is_pvid);
 	struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan;
 	u16 old_pvid = mlxsw_sp_port->pvid;
+	u16 proto;
 	int err;
 
 	/* The only valid scenario in which a port-vlan already exists, is if
@@ -1152,7 +1153,8 @@ mlxsw_sp_bridge_port_vlan_add(struct mlxsw_sp_port *mlxsw_sp_port,
 	if (err)
 		goto err_port_vlan_set;
 
-	err = mlxsw_sp_port_pvid_set(mlxsw_sp_port, pvid);
+	br_vlan_get_proto(bridge_port->bridge_device->dev, &proto);
+	err = mlxsw_sp_port_pvid_set(mlxsw_sp_port, pvid, proto);
 	if (err)
 		goto err_port_pvid_set;
 
@@ -1164,7 +1166,7 @@ mlxsw_sp_bridge_port_vlan_add(struct mlxsw_sp_port *mlxsw_sp_port,
 	return 0;
 
 err_port_vlan_bridge_join:
-	mlxsw_sp_port_pvid_set(mlxsw_sp_port, old_pvid);
+	mlxsw_sp_port_pvid_set(mlxsw_sp_port, old_pvid, proto);
 err_port_pvid_set:
 	mlxsw_sp_port_vlan_set(mlxsw_sp_port, vid, vid, false, false);
 err_port_vlan_set:
@@ -1821,13 +1823,15 @@ mlxsw_sp_bridge_port_vlan_del(struct mlxsw_sp_port *mlxsw_sp_port,
 {
 	u16 pvid = mlxsw_sp_port->pvid == vid ? 0 : mlxsw_sp_port->pvid;
 	struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan;
+	u16 proto;
 
 	mlxsw_sp_port_vlan = mlxsw_sp_port_vlan_find_by_vid(mlxsw_sp_port, vid);
 	if (WARN_ON(!mlxsw_sp_port_vlan))
 		return;
 
 	mlxsw_sp_port_vlan_bridge_leave(mlxsw_sp_port_vlan);
-	mlxsw_sp_port_pvid_set(mlxsw_sp_port, pvid);
+	br_vlan_get_proto(bridge_port->bridge_device->dev, &proto);
+	mlxsw_sp_port_pvid_set(mlxsw_sp_port, pvid, proto);
 	mlxsw_sp_port_vlan_set(mlxsw_sp_port, vid, vid, false, false);
 	mlxsw_sp_port_vlan_destroy(mlxsw_sp_port_vlan);
 }
@@ -1998,7 +2002,8 @@ mlxsw_sp_bridge_8021q_port_leave(struct mlxsw_sp_bridge_device *bridge_device,
 				 struct mlxsw_sp_port *mlxsw_sp_port)
 {
 	/* Make sure untagged frames are allowed to ingress */
-	mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID);
+	mlxsw_sp_port_pvid_set(mlxsw_sp_port, MLXSW_SP_DEFAULT_VID,
+			       ETH_P_8021Q);
 }
 
 static int