bench: Add hardware-in-the-loop test

cocotb/Makefile

@@ -1,7 +1,9 @@
 # defaults
+
 SIM ?= ghdl
 TOPLEVEL_LANG ?= vhdl
 BASE = $(PWD)/..
+BENCHTOP ?= cocotb_top_mac_test
 
 COMPILE_ARGS=--std=08
 SIM_ARGS ?= --wave=wave.ghw
@@ -11,7 +13,7 @@ VHDL_SOURCES_design += $(BASE)/design/*.vhd
 VHDL_SOURCES_design += $(BASE)/bench/pll0.vhd
 VHDL_SOURCES += $(BASE)/cocotb/*.vhd
 
-TOPLEVEL = cocotb_top_mac_test
+TOPLEVEL ?= $(BENCHTOP)
-MODULE = cocotb_top_mac_test
+MODULE ?= $(BENCHTOP)
 
 include $(shell cocotb-config --makefiles)/Makefile.sim

cocotb/hw_itl.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+
+import cocotb
+from cocotb.triggers import *
+from cocotb.result import *
+from cocotb.queue import Queue
+from cocotb_helpers import buffers
+
+import sys
+import threading
+import socket
+import time
+import os
+import asyncio
+import fcntl
+
+class MacDevReceiver():
+	def __init__(self, dut, eth_tx, eth_rx, dev):
+		self.dut = dut
+		self.eth_tx = eth_tx
+		self.eth_rx = eth_rx
+		self.dev = dev
+		self.mac_rx_ev = Event()
+
+		print("Setting IF to promisc mode...")
+		os.system("ip link set promisc on dev {}".format(dev))
+
+		ETH_P_ALL=3
+		self.macdev=socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_P_ALL))
+		self.macdev.bind((dev, 0))
+		fcntl.fcntl(self.macdev, fcntl.F_SETFL, os.O_NONBLOCK)
+
+	async def main(self):
+		ETH_HEAD = b'\x55\x55\x55\x55\xD5'
+		while True:
+			try:
+				r = self.macdev.recv(2000)
+				await self.eth_tx.send(ETH_HEAD + r);
+			except:
+				await Timer(1, "us")
+				pass
+	async def main_rx(self):
+		while True:
+			frame = await self.eth_rx.queue.get()
+			self.dut._log.info("RX Frame: " + str(frame))
+			self.macdev.send(frame)
+
+	async def start(self):
+		await cocotb.start(self.main())
+		await cocotb.start(self.main_rx())
+
+@cocotb.test()
+async def hwitl(dut):
+	"""Real-Ethernet-hardware in the loop test"""
+
+	# Start verification components
+	eth_tx = buffers.tx_buffer(dut, "cocovc_eth_inst.cocotb_tx_")
+	await eth_tx.start()
+	eth_rx = buffers.rx_buffer(dut, "cocovc_eth_inst.cocotb_rx_")
+	await eth_rx.start()
+
+	# Start local monitors
+	macdev_receiver = MacDevReceiver(dut, eth_tx, eth_rx, "virt0")
+
+	# Wait for VHDL part to be ready
+	await Edge(dut.bench_ready)
+
+	print("beep")
+	await macdev_receiver.start()
+
+	print("Press Ctrl+C to stop the test.")
+	await Timer(100, "sec")

cocotb/hw_itl.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo Hardware in the loop test
+
+make TOPLEVEL=cocotb_top_mac_test MODULE=hw_itl