1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
# Example showing how to define stream for latency measurement, and how to parse the latency information
import stl_path
from trex_stl_lib.api import *
import time
import pprint
def rx_example (tx_port, rx_port, burst_size, pps):
print("\nGoing to inject {0} packets on port {1} - checking RX stats on port {2}\n".format(burst_size, tx_port, rx_port))
# create client
c = STLClient()
passed = True
try:
pkt = STLPktBuilder(pkt = Ether()/IP(src="16.0.0.1",dst="48.0.0.1")/UDP(dport=12,sport=1025)/'at_least_16_bytes_payload_needed')
total_pkts = burst_size
s1 = STLStream(name = 'rx',
packet = pkt,
flow_stats = STLFlowLatencyStats(pg_id = 5),
mode = STLTXSingleBurst(total_pkts = total_pkts,
pps = pps))
# connect to server
c.connect()
# prepare our ports
c.reset(ports = [tx_port, rx_port])
# add both streams to ports
c.add_streams([s1], ports = [tx_port])
print("\nInjecting {0} packets on port {1}\n".format(total_pkts, tx_port))
rc = rx_iteration(c, tx_port, rx_port, total_pkts, pkt.get_pkt_len())
if not rc:
passed = False
except STLError as e:
passed = False
print(e)
finally:
c.disconnect()
if passed:
print("\nTest passed :-)\n")
else:
print("\nTest failed :-(\n")
# RX one iteration
def rx_iteration (c, tx_port, rx_port, total_pkts, pkt_len):
c.clear_stats()
c.start(ports = [tx_port])
c.wait_on_traffic(ports = [tx_port])
stats = c.get_stats()
flow_stats = stats['flow_stats'].get(5)
global_lat_stats = stats['latency']
lat_stats = global_lat_stats.get(5)
if not flow_stats:
print("no flow stats available")
return False
if not lat_stats:
print("no latency stats available")
return False
tx_pkts = flow_stats['tx_pkts'].get(tx_port, 0)
tx_bytes = flow_stats['tx_bytes'].get(tx_port, 0)
rx_pkts = flow_stats['rx_pkts'].get(rx_port, 0)
drops = lat_stats['err_cntrs']['dropped']
ooo = lat_stats['err_cntrs']['out_of_order']
dup = lat_stats['err_cntrs']['dup']
sth = lat_stats['err_cntrs']['seq_too_high']
stl = lat_stats['err_cntrs']['seq_too_low']
old_flow = global_lat_stats['global']['old_flow']
bad_hdr = global_lat_stats['global']['bad_hdr']
lat = lat_stats['latency']
jitter = lat['jitter']
avg = lat['average']
tot_max = lat['total_max']
tot_min = lat['total_min']
last_max = lat['last_max']
hist = lat ['histogram']
if c.get_warnings():
print("\n\n*** test had warnings ****\n\n")
for w in c.get_warnings():
print(w)
return False
print('Error counters: dropped:{0}, ooo:{1} dup:{2} seq too high:{3} seq too low:{4}'.format(drops, ooo, dup, sth, stl))
if old_flow:
print ('Packets arriving too late after flow stopped: {0}'.format(old_flow))
if bad_hdr:
print ('Latency packets with corrupted info: {0}'.format(bad_hdr))
print('Latency info:')
print(" Maximum latency(usec): {0}".format(tot_max))
print(" Minimum latency(usec): {0}".format(tot_min))
print(" Maximum latency in last sampling period (usec): {0}".format(last_max))
print(" Average latency(usec): {0}".format(avg))
print(" Jitter(usec): {0}".format(jitter))
print(" Latency distribution histogram:")
l = hist.keys()
l.sort()
for sample in l:
range_start = sample
if range_start == 0:
range_end = 10
else:
range_end = range_start + pow(10, (len(str(range_start))-1))
val = hist[sample]
print (" Packets with latency between {0} and {1}:{2} ".format(range_start, range_end, val))
if tx_pkts != total_pkts:
print("TX pkts mismatch - got: {0}, expected: {1}".format(tx_pkts, total_pkts))
pprint.pprint(flow_stats)
return False
else:
print("TX pkts match - {0}".format(tx_pkts))
if tx_bytes != (total_pkts * (pkt_len + 4)): # +4 for ethernet CRC
print("TX bytes mismatch - got: {0}, expected: {1}".format(tx_bytes, (total_pkts * pkt_len)))
pprint.pprint(flow_stats)
return False
else:
print("TX bytes match - {0}".format(tx_bytes))
if rx_pkts != total_pkts:
print("RX pkts mismatch - got: {0}, expected: {1}".format(rx_pkts, total_pkts))
pprint.pprint(flow_stats)
return False
else:
print("RX pkts match - {0}".format(rx_pkts))
return True
# run the tests
rx_example(tx_port = 0, rx_port = 1, burst_size = 1000, pps = 1000)
|
