mlxsw: reg: Add the Monitoring Port Analyzer register

The MPAR register is used to bind ports to a SPAN entry (which was
created using MPAT register) and thus mirror their traffic (ingress /
egress) to a different port.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -4675,6 +4675,16 @@ MLXSW_ITEM32(reg, mpat, e, 0x04, 31, 1);
  */
 MLXSW_ITEM32(reg, mpat, qos, 0x04, 26, 1);
 
+/* reg_mpat_be
+ * Best effort mode. Indicates mirroring traffic should not cause packet
+ * drop or back pressure, but will discard the mirrored packets. Mirrored
+ * packets will be forwarded on a best effort manner.
+ * 0: Do not discard mirrored packets
+ * 1: Discard mirrored packets if causing congestion
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, mpat, be, 0x04, 25, 1);
+
 static inline void mlxsw_reg_mpat_pack(char *payload, u8 pa_id,
 				       u16 system_port, bool e)
 {
@@ -4683,6 +4693,61 @@ static inline void mlxsw_reg_mpat_pack(char *payload, u8 pa_id,
 	mlxsw_reg_mpat_system_port_set(payload, system_port);
 	mlxsw_reg_mpat_e_set(payload, e);
 	mlxsw_reg_mpat_qos_set(payload, 1);
+	mlxsw_reg_mpat_be_set(payload, 1);
+}
+
+/* MPAR - Monitoring Port Analyzer Register
+ * ----------------------------------------
+ * MPAR register is used to query and configure the port analyzer port mirroring
+ * properties.
+ */
+#define MLXSW_REG_MPAR_ID 0x901B
+#define MLXSW_REG_MPAR_LEN 0x08
+
+static const struct mlxsw_reg_info mlxsw_reg_mpar = {
+	.id = MLXSW_REG_MPAR_ID,
+	.len = MLXSW_REG_MPAR_LEN,
+};
+
+/* reg_mpar_local_port
+ * The local port to mirror the packets from.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mpar, local_port, 0x00, 16, 8);
+
+enum mlxsw_reg_mpar_i_e {
+	MLXSW_REG_MPAR_TYPE_EGRESS,
+	MLXSW_REG_MPAR_TYPE_INGRESS,
+};
+
+/* reg_mpar_i_e
+ * Ingress/Egress
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mpar, i_e, 0x00, 0, 4);
+
+/* reg_mpar_enable
+ * Enable mirroring
+ * By default, port mirroring is disabled for all ports.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, mpar, enable, 0x04, 31, 1);
+
+/* reg_mpar_pa_id
+ * Port Analyzer ID.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, mpar, pa_id, 0x04, 0, 4);
+
+static inline void mlxsw_reg_mpar_pack(char *payload, u8 local_port,
+				       enum mlxsw_reg_mpar_i_e i_e,
+				       bool enable, u8 pa_id)
+{
+	MLXSW_REG_ZERO(mpar, payload);
+	mlxsw_reg_mpar_local_port_set(payload, local_port);
+	mlxsw_reg_mpar_enable_set(payload, enable);
+	mlxsw_reg_mpar_i_e_set(payload, i_e);
+	mlxsw_reg_mpar_pa_id_set(payload, pa_id);
 }
 
 /* MLCR - Management LED Control Register
@@ -5258,6 +5323,8 @@ static inline const char *mlxsw_reg_id_str(u16 reg_id)
 		return "MTCAP";
 	case MLXSW_REG_MPAT_ID:
 		return "MPAT";
+	case MLXSW_REG_MPAR_ID:
+		return "MPAR";
 	case MLXSW_REG_MTMP_ID:
 		return "MTMP";
 	case MLXSW_REG_MLCR_ID: