net: mscc: ocelot: Add support for MRP

Add basic support for MRP. The HW will just trap all MRP frames on the
ring ports to CPU and allow the SW to process them. In this way it is
possible to for this node to behave both as MRM and MRC.

Current limitations are:
- it doesn't support Interconnect roles.
- it supports only a single ring.
- the HW should be able to do forwarding of MRP Test frames so the SW
  will not need to do this. So it would be able to have the role MRC
  without SW support.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 1f2d90976564..425ff29d9389 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -112,6 +112,8 @@
 #define REG_RESERVED_ADDR		0xffffffff
 #define REG_RESERVED(reg)		REG(reg, REG_RESERVED_ADDR)
 
+#define OCELOT_MRP_CPUQ			7
+
 enum ocelot_target {
 	ANA = 1,
 	QS,
@@ -677,6 +679,12 @@ struct ocelot {
 	/* Protects the PTP clock */
 	spinlock_t			ptp_clock_lock;
 	struct ptp_pin_desc		ptp_pins[OCELOT_PTP_PINS_NUM];
+
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+	u16				mrp_ring_id;
+	struct net_device		*mrp_p_port;
+	struct net_device		*mrp_s_port;
+#endif
 };
 
 struct ocelot_policer {
@@ -874,4 +882,41 @@ int ocelot_sb_occ_tc_port_bind_get(struct ocelot *ocelot, int port,
 				   enum devlink_sb_pool_type pool_type,
 				   u32 *p_cur, u32 *p_max);
 
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+int ocelot_mrp_add(struct ocelot *ocelot, int port,
+		   const struct switchdev_obj_mrp *mrp);
+int ocelot_mrp_del(struct ocelot *ocelot, int port,
+		   const struct switchdev_obj_mrp *mrp);
+int ocelot_mrp_add_ring_role(struct ocelot *ocelot, int port,
+			     const struct switchdev_obj_ring_role_mrp *mrp);
+int ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
+			     const struct switchdev_obj_ring_role_mrp *mrp);
+#else
+static inline int ocelot_mrp_add(struct ocelot *ocelot, int port,
+				 const struct switchdev_obj_mrp *mrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int ocelot_mrp_del(struct ocelot *ocelot, int port,
+				 const struct switchdev_obj_mrp *mrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int
+ocelot_mrp_add_ring_role(struct ocelot *ocelot, int port,
+			 const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int
+ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
+			 const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 #endif