net: dsa: mv88e6xxx: factorize VTU access

Add a MV88E6XXX_FLAG_VTU flag to indentify switch models with a VLAN
Table Unit.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6123.c

@@ -136,6 +136,11 @@ struct dsa_switch_driver mv88e6123_switch_driver = {
 	.port_bridge_join	= mv88e6xxx_port_bridge_join,
 	.port_bridge_leave	= mv88e6xxx_port_bridge_leave,
 	.port_stp_state_set	= mv88e6xxx_port_stp_state_set,
+	.port_vlan_filtering	= mv88e6xxx_port_vlan_filtering,
+	.port_vlan_prepare	= mv88e6xxx_port_vlan_prepare,
+	.port_vlan_add		= mv88e6xxx_port_vlan_add,
+	.port_vlan_del		= mv88e6xxx_port_vlan_del,
+	.port_vlan_dump		= mv88e6xxx_port_vlan_dump,
 };
 
 MODULE_ALIAS("platform:mv88e6123");

drivers/net/dsa/mv88e6xxx.c

@@ -1596,6 +1596,9 @@ int mv88e6xxx_port_vlan_dump(struct dsa_switch *ds, int port,
 	u16 pvid;
 	int err;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VTU))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&ps->smi_mutex);
 
 	err = _mv88e6xxx_port_pvid_get(ps, port, &pvid);
@@ -2019,6 +2022,9 @@ int mv88e6xxx_port_vlan_filtering(struct dsa_switch *ds, int port,
 		PORT_CONTROL_2_8021Q_DISABLED;
 	int ret;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VTU))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&ps->smi_mutex);
 
 	ret = _mv88e6xxx_reg_read(ps, REG_PORT(port), PORT_CONTROL_2);
@@ -2052,8 +2058,12 @@ int mv88e6xxx_port_vlan_prepare(struct dsa_switch *ds, int port,
 				const struct switchdev_obj_port_vlan *vlan,
 				struct switchdev_trans *trans)
 {
+	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int err;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VTU))
+		return -EOPNOTSUPP;
+
 	/* If the requested port doesn't belong to the same bridge as the VLAN
 	 * members, do not support it (yet) and fallback to software VLAN.
 	 */
@@ -2094,6 +2104,9 @@ void mv88e6xxx_port_vlan_add(struct dsa_switch *ds, int port,
 	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 	u16 vid;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VTU))
+		return;
+
 	mutex_lock(&ps->smi_mutex);
 
 	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid)
@@ -2151,6 +2164,9 @@ int mv88e6xxx_port_vlan_del(struct dsa_switch *ds, int port,
 	u16 pvid, vid;
 	int err = 0;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VTU))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&ps->smi_mutex);
 
 	err = _mv88e6xxx_port_pvid_get(ps, port, &pvid);

drivers/net/dsa/mv88e6xxx.h

@@ -394,6 +394,11 @@ enum mv88e6xxx_cap {
 	 * the output (or egress) ports to which it is allowed to send frames.
 	 */
 	MV88E6XXX_CAP_VLANTABLE,
+
+	/* VLAN Table Unit.
+	 * The VTU is used to program 802.1Q VLANs. See GLOBAL_VTU_OP.
+	 */
+	MV88E6XXX_CAP_VTU,
 };
 
 /* Bitmask of capabilities */
@@ -406,14 +411,17 @@ enum mv88e6xxx_cap {
 #define MV88E6XXX_FLAG_TEMP		BIT(MV88E6XXX_CAP_TEMP)
 #define MV88E6XXX_FLAG_TEMP_LIMIT	BIT(MV88E6XXX_CAP_TEMP_LIMIT)
 #define MV88E6XXX_FLAG_VLANTABLE	BIT(MV88E6XXX_CAP_VLANTABLE)
+#define MV88E6XXX_FLAG_VTU		BIT(MV88E6XXX_CAP_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6095	\
 	(MV88E6XXX_FLAG_PPU |		\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6097	\
 	(MV88E6XXX_FLAG_PPU |		\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6165	\
 	(MV88E6XXX_FLAG_SWITCH_MAC |	\
@@ -421,7 +429,8 @@ enum mv88e6xxx_cap {
 
 #define MV88E6XXX_FLAGS_FAMILY_6185	\
 	(MV88E6XXX_FLAG_PPU |		\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6320	\
 	(MV88E6XXX_FLAG_EEE |		\
@@ -431,14 +440,16 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAG_SWITCH_MAC |	\
 	 MV88E6XXX_FLAG_TEMP |		\
 	 MV88E6XXX_FLAG_TEMP_LIMIT |	\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6351	\
 	(MV88E6XXX_FLAG_PORTSTATE |	\
 	 MV88E6XXX_FLAG_SMI_PHY |	\
 	 MV88E6XXX_FLAG_SWITCH_MAC |	\
 	 MV88E6XXX_FLAG_TEMP |		\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6352	\
 	(MV88E6XXX_FLAG_EEE |		\
@@ -448,7 +459,8 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAG_SWITCH_MAC |	\
 	 MV88E6XXX_FLAG_TEMP |		\
 	 MV88E6XXX_FLAG_TEMP_LIMIT |	\
-	 MV88E6XXX_FLAG_VLANTABLE)
+	 MV88E6XXX_FLAG_VLANTABLE |	\
+	 MV88E6XXX_FLAG_VTU)
 
 struct mv88e6xxx_info {
 	enum mv88e6xxx_family family;