95 lines
2.3 KiB
Python
95 lines
2.3 KiB
Python
#!/usr/bin/env python3
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import cocotb
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from cocotb.triggers import *
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from cocotb.result import *
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from cocotb.queue import Queue
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from cocotb_helpers import buffers
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import sys
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import threading
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import socket
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import time
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import os
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import asyncio
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import fcntl
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import zlib
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'''
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# Set up virtual device using
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sudo ip link add dev veth1 type veth peer name veth2
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sudo ip link set up veth1
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sudo ip link set up veth2
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sudo ip addr add 192.168.2.1/24 dev veth1
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sudo ip link set promisc on dev veth1
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'''
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class MacDevReceiver():
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def __init__(self, dut, eth_tx, eth_rx, dev):
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self.dut = dut
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self.eth_tx = eth_tx
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self.eth_rx = eth_rx
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self.dev = dev
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self.mac_rx_ev = Event()
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ETH_P_ALL=3
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self.macdev=socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_P_ALL))
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self.macdev.bind((dev, 0))
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fcntl.fcntl(self.macdev, fcntl.F_SETFL, os.O_NONBLOCK) # Not the best way to poll, but I couldn't get asyncio to play nicely with threading...
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def eth_fcs(self, data):
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crc = zlib.crc32(data) & 0xFFFF_FFFF
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return crc.to_bytes(4, byteorder='little')
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async def main(self):
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ETH_HEAD = b'\x55\x55\x55\x55\xD5'
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while True:
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try:
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r = self.macdev.recv(2000)
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if len(r) < 60:
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r += b'\x00' * (60 - len(r))
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r += self.eth_fcs(r)
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self.dut._log.debug("DUT RX: " + str(r))
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await self.eth_tx.send(ETH_HEAD + r);
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except:
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await Timer(1, "us")
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pass
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async def main_rx(self):
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while True:
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frame = await self.eth_rx.queue.get()
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try:
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while (frame[0] != 0xD5):
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frame = frame[1:]
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frame = frame[1:]
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except:
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self.dut._log.debug("NLP / Invalid frame")
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continue
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self.dut._log.debug("DUT TX: " + str(frame))
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self.macdev.send(frame)
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async def start(self):
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await cocotb.start(self.main())
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await cocotb.start(self.main_rx())
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@cocotb.test()
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async def hwitl(dut):
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"""Real-Ethernet-hardware in the loop test"""
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# Start verification components
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eth_tx = buffers.tx_buffer(dut, "cocovc_eth_inst.cocotb_tx_")
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await eth_tx.start()
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eth_rx = buffers.rx_buffer(dut, "cocovc_eth_inst.cocotb_rx_")
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await eth_rx.start()
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# Start local monitors
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macdev_receiver = MacDevReceiver(dut, eth_tx, eth_rx, "veth2")
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# Wait for VHDL part to be ready
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await Edge(dut.bench_ready)
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print("beep")
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await macdev_receiver.start()
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print("Press Ctrl+C to stop the test.")
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await Timer(100, "sec")
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