rfnoc: lib: introduce ctrl-port interface and BFM

Original-commit: 886cf97ad5d494b20c6fff0a53113f6096d458c7

lib/rfnoc/core/ctrlport_if.sv

@@ -0,0 +1,42 @@
+//
+// Copyright 2024 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// Interface: ctrlport_if
+//
+// Description:
+//
+//   Defines a SystemVerilog interface for the control-port bus.
+//
+
+interface ctrlport_if (
+  input logic clk,
+  input logic rst = 1'b0
+);
+
+  import ctrlport_pkg::*;
+
+  // Consisting of a request and a response moving in different directions.
+  ctrlport_request_t  req;
+  ctrlport_response_t resp;
+
+  // Master driving the request and consuming the response.
+  modport master (
+    input  clk,
+    input  rst,
+
+    output req,
+    input  resp
+  );
+
+  // Slave consuming the request and driving the response.
+  modport slave (
+    input  clk,
+    input  rst,
+
+    input  req,
+    output resp
+  );
+
+endinterface : ctrlport_if