mlxsw: reg: Add Management DownStream Device Tunneling Register

The MDDT register allows to deliver query and request messages (PRM
registers, commands) to a DownStream device.
Signed-off-by: Jiri Pirko <jiri@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

@@ -11364,6 +11364,95 @@ mlxsw_reg_mbct_unpack(const char *payload, u8 *p_slot_index,
 		*p_fsm_state = mlxsw_reg_mbct_fsm_state_get(payload);
 }
 
+/* MDDT - Management DownStream Device Tunneling Register
+ * ------------------------------------------------------
+ * This register allows to deliver query and request messages (PRM registers,
+ * commands) to a DownStream device.
+ */
+#define MLXSW_REG_MDDT_ID 0x9160
+#define MLXSW_REG_MDDT_LEN 0x110
+
+MLXSW_REG_DEFINE(mddt, MLXSW_REG_MDDT_ID, MLXSW_REG_MDDT_LEN);
+
+/* reg_mddt_slot_index
+ * Slot index.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mddt, slot_index, 0x00, 8, 4);
+
+/* reg_mddt_device_index
+ * Device index.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mddt, device_index, 0x00, 0, 8);
+
+/* reg_mddt_read_size
+ * Read size in D-Words.
+ * Access: OP
+ */
+MLXSW_ITEM32(reg, mddt, read_size, 0x04, 24, 8);
+
+/* reg_mddt_write_size
+ * Write size in D-Words.
+ * Access: OP
+ */
+MLXSW_ITEM32(reg, mddt, write_size, 0x04, 16, 8);
+
+enum mlxsw_reg_mddt_status {
+	MLXSW_REG_MDDT_STATUS_OK,
+};
+
+/* reg_mddt_status
+ * Return code of the Downstream Device to the register that was sent.
+ * Access: RO
+ */
+MLXSW_ITEM32(reg, mddt, status, 0x0C, 24, 8);
+
+enum mlxsw_reg_mddt_method {
+	MLXSW_REG_MDDT_METHOD_QUERY,
+	MLXSW_REG_MDDT_METHOD_WRITE,
+};
+
+/* reg_mddt_method
+ * Access: OP
+ */
+MLXSW_ITEM32(reg, mddt, method, 0x0C, 22, 2);
+
+/* reg_mddt_register_id
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mddt, register_id, 0x0C, 0, 16);
+
+#define MLXSW_REG_MDDT_PAYLOAD_OFFSET 0x0C
+#define MLXSW_REG_MDDT_PRM_REGISTER_HEADER_LEN 4
+
+static inline char *mlxsw_reg_mddt_inner_payload(char *payload)
+{
+	return payload + MLXSW_REG_MDDT_PAYLOAD_OFFSET +
+	       MLXSW_REG_MDDT_PRM_REGISTER_HEADER_LEN;
+}
+
+static inline void mlxsw_reg_mddt_pack(char *payload, u8 slot_index,
+				       u8 device_index,
+				       enum mlxsw_reg_mddt_method method,
+				       const struct mlxsw_reg_info *reg,
+				       char **inner_payload)
+{
+	int len = reg->len + MLXSW_REG_MDDT_PRM_REGISTER_HEADER_LEN;
+
+	if (WARN_ON(len + MLXSW_REG_MDDT_PAYLOAD_OFFSET > MLXSW_REG_MDDT_LEN))
+		len = MLXSW_REG_MDDT_LEN - MLXSW_REG_MDDT_PAYLOAD_OFFSET;
+
+	MLXSW_REG_ZERO(mddt, payload);
+	mlxsw_reg_mddt_slot_index_set(payload, slot_index);
+	mlxsw_reg_mddt_device_index_set(payload, device_index);
+	mlxsw_reg_mddt_method_set(payload, method);
+	mlxsw_reg_mddt_register_id_set(payload, reg->id);
+	mlxsw_reg_mddt_read_size_set(payload, len / 4);
+	mlxsw_reg_mddt_write_size_set(payload, len / 4);
+	*inner_payload = mlxsw_reg_mddt_inner_payload(payload);
+}
+
 /* MDDQ - Management DownStream Device Query Register
  * --------------------------------------------------
  * This register allows to query the DownStream device properties. The desired
@@ -12943,6 +13032,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(mfgd),
 	MLXSW_REG(mgpir),
 	MLXSW_REG(mbct),
+	MLXSW_REG(mddt),
 	MLXSW_REG(mddq),
 	MLXSW_REG(mddc),
 	MLXSW_REG(mfde),