improve test_udp (add random data and check)

test/test_udp.py

@@ -1,23 +1,71 @@
 import socket
 import time
 import threading
+import copy
+
+KB = 1024
+MB = 1024*KB
+GB = 1024*MB
+
+def seed_to_data(seed, random=True):
+	if random:
+		return (seed * 0x31415979 + 1) & 0xffffffff
+	else:
+		return seed
+
+def check(p1, p2):
+	p1 = copy.deepcopy(p1)
+	p2 = copy.deepcopy(p2)
+	if isinstance(p1, int):
+		return 0, 1, int(p1 != p2)
+	else:
+		if len(p1) >= len(p2):
+			ref, res = p1, p2
+		else:
+			ref, res = p2, p1
+		shift = 0
+		while((ref[0] != res[0]) and (len(res)>1)):
+			res.pop(0)
+			shift += 1
+		length = min(len(ref), len(res))
+		errors = 0
+		for i in range(length):
+			if ref.pop(0) != res.pop(0):
+				errors += 1
+		return shift, length, errors
+
+def generate_packet(seed, length):
+	r = []
+	for i in range(length):
+		r.append(seed_to_data(seed, True)%0xff) # XXX FIXME
+		seed += 1
+	return r, seed
 
 FPGA_IP = "192.168.1.40"
 HOST_IP = "192.168.1.12"
-UDP_PORT = 5010
+UDP_PORT = 6000
 MESSAGE = bytes("LiteEth UDP Loopback test", "utf-8")
 tx_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 rx_sock  = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 rx_sock.bind(("", UDP_PORT))
 
 def receive():
-    while True:
+	rx_seed = 0
+	while rx_seed < 1*MB:
 		data, addr = rx_sock.recvfrom(1024)
-      print(data)
+		rx_packet = []
+		for byte in data:
+			rx_packet.append(int(byte))
+		rx_reference_packet, rx_seed = generate_packet(rx_seed, 512)
+		s, l, e = check(rx_reference_packet, rx_packet)
+		print("shift "+ str(s) + " / length " + str(l) + " / errors " + str(e))
+	done = True
 
 def send():
-  while True:
+	tx_seed = 0
-    tx_sock.sendto(MESSAGE, (FPGA_IP, UDP_PORT))
+	while tx_seed < 1*MB:
+		tx_packet, tx_seed = generate_packet(tx_seed, 512)
+		tx_sock.sendto(bytes(tx_packet), (FPGA_IP, UDP_PORT))
 		time.sleep(0.01)
 
 receive_thread = threading.Thread(target=receive, daemon=True)