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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
#!/usr/bin/env python
# Start an iPerf connection stream between two Linux namespaces ##
import subprocess
import os
import sys
class VppIperf:
""" "Create an iPerf connection stream between two namespaces.
Usage:
iperf = VppIperf() # Create the iPerf Object
iperf.client_ns = 'ns1' # Client Namespace
iperf.server_ns = 'ns2' # Server Namespace
iperf.server_ip = '10.0.0.102' # Server IP Address
iperf.start() # Start the connection stream
Optional:
iperf.duration = 15 # Time to transmit for in seconds (Default=10)
## Optionally set any iperf client & server args
Example:
# Run 4 parallel streams, write to logfile & bind to port 5202
iperf.client_args='-P 4 --logfile /tmp/vpp-vm-tests/vpp_iperf.log -p 5202'
iperf.server_args='-p 5202'
"""
def __init__(self, server_ns=None, client_ns=None, server_ip=None, logger=None):
self.server_ns = server_ns
self.client_ns = client_ns
self.server_ip = server_ip
self.duration = 10
self.client_args = ""
self.server_args = ""
self.logger = logger
# Set the iperf executable
self.iperf = self.get_iperf()
def ensure_init(self):
if self.server_ns and self.client_ns and self.server_ip:
return True
else:
raise Exception(
"Error: Cannot Start." "iPerf object has not been initialized"
)
def get_iperf(self):
"""Return the iperf executable for running tests.
Look for the iperf executable in the following order
1. ${TEST_DATA_DIR}/usr/bin/iperf # running tests inside the VM
2. /usr/bin/iperf3 # running tests on the host
"""
vm_test_dir = os.getenv("TEST_DATA_DIR", "/tmp/vpp-vm-tests")
if os.path.isdir(vm_test_dir):
iperf = os.path.join(vm_test_dir, "/usr/bin/iperf")
else:
iperf = "/usr/bin/iperf3"
if os.path.exists(iperf):
return iperf
else:
self.logger.error(f"Could not find an iperf executable for running tests")
sys.exit(1)
def start_iperf_server(self):
"""Starts the iperf server and returns the process cmdline args."""
args = [
"ip",
"netns",
"exec",
self.server_ns,
self.iperf,
"-s",
"-D",
]
args.extend(self.server_args.split())
cmd = " ".join(args)
self.logger.debug(f"Starting iperf server: {cmd}")
try:
subprocess.run(
cmd,
timeout=self.duration + 5,
encoding="utf-8",
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
except subprocess.TimeoutExpired as e:
raise Exception("Error: Timeout expired for iPerf", e.output)
return args[4:]
def start_iperf_client(self):
args = [
"ip",
"netns",
"exec",
self.client_ns,
self.iperf,
"-c",
self.server_ip,
"-t",
str(self.duration),
]
args.extend(self.client_args.split())
args = " ".join(args)
try:
return subprocess.run(
args,
timeout=self.duration + 5,
encoding="utf-8",
capture_output=True,
shell=True,
)
except subprocess.TimeoutExpired as e:
raise Exception("Error: Timeout expired for iPerf", e.output)
def start(self, server_only=False, client_only=False):
"""Runs iPerf.
Starts the iperf server daemon & runs the iperf client.
arguments:-
server_only -- start the iperf server daemon only
client_only -- run the iperf client only
Return True if we have no errors in iPerf client, else False.
"""
self.ensure_init()
if not client_only:
return self.start_iperf_server()
if not server_only:
result = self.start_iperf_client()
self.logger.debug(f"Iperf client args: {result.args}")
self.logger.debug(result.stdout)
if result.stderr:
self.logger.error(
f"Error starting Iperf Client in Namespace: {self.client_ns}"
)
self.logger.error(f"Iperf client args: {result.args}")
self.logger.error(f"Iperf client has errors: {result.stderr}")
return False
else:
return True
## Functions to start and stop iPerf using the iPerf object
def start_iperf(
ip_version,
client_ns="iprf_client_ns",
server_ns="iprf_server_ns",
server_ipv4_address="10.0.0.102",
server_ipv6_address="2001:1::2",
client_args="",
server_args="",
duration=10,
server_only=False,
client_only=False,
logger=None,
):
"""Start an iperf connection stream using the iPerf object.
Starts iPerf an connection stream between an iPerf client in the
client namespace (client_ns) and a server in another
namespace (server_ns).
Parameters:
ip_version - 4 or 6
client_ns - iPerf client namespace
server_ns - iPerf server namespace
server_ipv4_address - ipv4 address of the server, if ip_version=4
server_ipv6_address - ipv6 address of the server, if ip_version=6
client_args - Additonal iperf control arguments to be passed
to the iperf client from the test (str)
server_args - Additonal iperf control arguments to be passed
to the iperf server from the test (str)
duration - Iperf duration in seconds
server_only - start iperf server only
client_only - start the iperf client only
logger - test logger
"""
if ip_version == 4:
iperf_server_ip = server_ipv4_address
elif ip_version == 6:
iperf_server_ip = server_ipv6_address
client_args = "-V" + " " + client_args
server_args = "-V" + " " + server_args
iperf = VppIperf()
iperf.client_ns = client_ns
iperf.server_ns = server_ns
iperf.server_ip = iperf_server_ip
iperf.client_args = client_args
iperf.server_args = server_args
iperf.duration = duration
iperf.logger = logger
return iperf.start(server_only=server_only, client_only=client_only)
def stop_iperf(iperf_cmd):
"""Stop the iperf process matching the iperf_cmd string."""
args = ["pgrep", "-x", "-f", iperf_cmd]
p = subprocess.Popen(
args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8"
)
stdout, _ = p.communicate()
for pid in stdout.split():
try:
subprocess.run(
f"kill -9 {pid}",
encoding="utf-8",
shell=True,
)
except Exception:
pass
if __name__ == "__main__":
# Run iPerf using default settings
iperf = VppIperf()
iperf.client_ns = "ns1"
iperf.server_ns = "ns2"
iperf.server_ip = "10.0.0.102"
iperf.duration = 20
iperf.start()
|
