def __run_traffic(api, config, data_flow_names, all_flow_names, exp_dur_sec):
"""
Run traffic and dump per-flow statistics
Args:
api (obj): IXIA session
config (obj): experiment config (testbed config + flow config)
data_flow_names (list): list of names of data (test and background) flows
all_flow_names (list): list of names of all the flows
exp_dur_sec (int): experiment duration in second
Returns:
per-flow statistics (list)
"""
api.set_state(State(ConfigState(config=config, state='set')))
api.set_state(State(FlowTransmitState(state='start')))
time.sleep(exp_dur_sec)
while True:
rows = api.get_flow_results(FlowRequest(flow_names=data_flow_names))
""" If all the data flows have stopped """
transmit_states = [row['transmit'] for row in rows]
if len(rows) == len(data_flow_names) and\
list(set(transmit_states)) == ['stopped']:
time.sleep(IXIA_POLL_DELAY_SEC)
break
else:
time.sleep(1)
""" Dump per-flow statistics """
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
api.set_state(State(FlowTransmitState(state='stop')))
return rows
def __run_traffic(api,
config,
all_flow_names,
exp_dur_sec,
capture_port_name,
pcap_file_name):
"""
Run traffic and capture packets
Args:
api (obj): IXIA session
config (obj): experiment config
all_flow_names (list): names of all the flows
capture_port_name (str): name of the port to capture packets
pcap_file_name (str): name of the pcap file to store captured packets
Returns:
N/A
"""
api.set_state(State(ConfigState(config=config, state='set')))
api.set_state(State(PortCaptureState(port_names=[capture_port_name],
state='start')))
api.set_state(State(FlowTransmitState(state='start')))
time.sleep(exp_dur_sec)
attempts = 0
max_attempts = 20
while attempts < max_attempts:
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
""" If all the flows have stopped """
transmit_states = [row['transmit'] for row in rows]
if len(rows) == len(all_flow_names) and\
list(set(transmit_states)) == ['stopped']:
time.sleep(IXIA_POLL_DELAY_SEC)
break
else:
time.sleep(1)
attempts += 1
""" Dump captured packets """
pcap_bytes = api.get_capture_results(CaptureRequest(port_name=capture_port_name))
with open(pcap_file_name, 'wb') as fid:
fid.write(pcap_bytes)
""" Stop all the flows """
api.set_state(State(FlowTransmitState(state='stop')))
def __run_traffic(api, config, duthost, all_flow_names, pfcwd_start_delay_sec,
exp_dur_sec):
"""
Start traffic at time 0 and enable PFC watchdog at pfcwd_start_delay_sec
Args:
api (obj): IXIA session
config (obj): experiment config (testbed config + flow config)
duthost (Ansible host instance): device under test
all_flow_names (list): list of names of all the flows
pfcwd_start_delay_sec (int): PFC watchdog start delay in second
exp_dur_sec (int): experiment duration in second
Returns:
per-flow statistics (list)
"""
api.set_state(State(ConfigState(config=config, state='set')))
api.set_state(State(FlowTransmitState(state='start')))
time.sleep(pfcwd_start_delay_sec)
start_pfcwd(duthost)
time.sleep(exp_dur_sec - pfcwd_start_delay_sec)
attempts = 0
max_attempts = 20
while attempts < max_attempts:
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
""" If all the flows have stopped """
transmit_states = [row['transmit'] for row in rows]
if len(rows) == len(all_flow_names) and\
list(set(transmit_states)) == ['stopped']:
time.sleep(IXIA_POLL_DELAY_SEC)
break
else:
time.sleep(1)
attempts += 1
pytest_assert(attempts < max_attempts,
"Flows do not stop in {} seconds".format(max_attempts))
""" Dump per-flow statistics """
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
api.set_state(State(FlowTransmitState(state='stop')))
return rows
def __run_traffic(api, config, all_flow_names, exp_dur_sec):
"""
Run traffic and dump per-flow statistics
Args:
api (obj): IXIA session
config (obj): experiment config (testbed config + flow config)
all_flow_names (list): list of names of all the flows
exp_dur_sec (float): experiment duration in second
Returns:
per-flow statistics (list)
"""
api.set_state(State(ConfigState(config=config, state='set')))
api.set_state(State(FlowTransmitState(state='start')))
time.sleep(exp_dur_sec)
attempts = 0
max_attempts = 20
while attempts < max_attempts:
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
""" If all the flows have stopped """
transmit_states = [row['transmit'] for row in rows]
if len(rows) == len(all_flow_names) and\
list(set(transmit_states)) == ['stopped']:
time.sleep(IXIA_POLL_DELAY_SEC)
break
else:
time.sleep(1)
attempts += 1
pytest_assert(attempts < max_attempts,
"Flows do not stop in {} seconds".format(max_attempts))
""" Dump per-flow statistics """
rows = api.get_flow_results(FlowRequest(flow_names=all_flow_names))
api.set_state(State(FlowTransmitState(state='stop')))
return rows
def test_pfc_pause_config(api, tx_port, rx_port):
"""Configure only a pfc pause frame
"""
tx_rx_map = PortTxRx(tx_port_name=tx_port.name,
rx_port_names=[rx_port.name])
pause = PfcPause()
flow = Flow(name='Pause',
tx_rx=TxRx(tx_rx_map),
packet=[Header(pause)],
size=Size(64),
rate=Rate('pps', value=1000000),
duration=Duration(
FixedPackets(packets=1024,
delay=120,
delay_unit='nanoseconds')))
config = Config(ports=[tx_port, rx_port], flows=[flow])
api.set_state(State(ConfigState(config=config, state='set')))
def test_tgen(traffic_config, ixia_api):
config = traffic_config
flow_name = config.flows[0].name
pkt_size = config.flows[0].size.fixed
rate_percent = config.flows[0].rate.value
duration_sec = config.flows[0].duration.seconds.seconds
port_speed = config.layer1[0].speed
words = port_speed.split('_')
pytest_assert(
len(words) == 3 and words[1].isdigit(),
'Fail to get port speed from {}'.format(port_speed))
port_speed_gbps = int(words[1])
""" Apply configuration """
ixia_api.set_state(State(ConfigState(config=config, state='set')))
""" Start traffic """
ixia_api.set_state(State(FlowTransmitState(state='start')))
""" Wait for traffic to finish """
time.sleep(duration_sec)
while True:
rows = ixia_api.get_flow_results(FlowRequest(flow_names=[flow_name]))
if len(rows) == 1 and \
rows[0]['name'] == flow_name and \
rows[0]['transmit'] == 'stopped':
""" Wait for counters to fully propagate """
time.sleep(2)
break
else:
time.sleep(1)
""" Dump per-flow statistics """
rows = ixia_api.get_flow_results(FlowRequest(flow_names=[flow_name]))
""" Stop traffic """
ixia_api.set_state(State(FlowTransmitState(state='stop')))
""" Analyze traffic results """
pytest_assert(
len(rows) == 1 and rows[0]['name'] == flow_name,
'Fail to get results of flow {}'.format(flow_name))
row = rows[0]
rx_frames = row['frames_rx']
tx_frames = row['frames_tx']
pytest_assert(
rx_frames == tx_frames,
'Unexpected packet losses (Tx: {}, Rx: {})'.format(
tx_frames, rx_frames))
tput_bps = port_speed_gbps * 1e9 * rate_percent / 100.0
exp_rx_frames = tput_bps * duration_sec / 8 / pkt_size
deviation_thresh = 0.05
ratio = float(exp_rx_frames) / rx_frames
deviation = abs(ratio - 1)
pytest_assert(
deviation <= deviation_thresh,
'Expected / Actual # of pkts: {} / {}'.format(exp_rx_frames,
rx_frames))
def test_tgen(conn_graph_facts, fanout_graph_facts, ixia_api, ixia_testbed,
enum_dut_portname_oper_up):
"""
Test if we can use Tgen API generate traffic in a testbed
Args:
conn_graph_facts (pytest fixture): connection graph
fanout_graph_facts (pytest fixture): fanout graph
ixia_api (pytest fixture): IXIA session
ixia_testbed (pytest fixture): L2/L3 config of a T0 testbed
enum_dut_portname_oper_up (str): name of port to test, e.g., 's6100-1|Ethernet0'
Returns:
None
"""
words = enum_dut_portname_oper_up.split('|')
pytest_require(len(words) == 2, "Fail to parse port name")
dut_hostname = words[0]
dut_port = words[1]
config = ixia_testbed
config.flows = __gen_traffic(testbed_config=config,
dut_hostname=dut_hostname,
dut_port=dut_port,
conn_data=conn_graph_facts,
fanout_data=fanout_graph_facts)
flow_name = config.flows[0].name
pkt_size = config.flows[0].size.fixed
rate_percent = config.flows[0].rate.value
duration_sec = config.flows[0].duration.seconds.seconds
port_speed = config.layer1[0].speed
words = port_speed.split('_')
pytest_assert(
len(words) == 3 and words[1].isdigit(),
'Fail to get port speed from {}'.format(port_speed))
port_speed_gbps = int(words[1])
""" Apply configuration """
ixia_api.set_state(State(ConfigState(config=config, state='set')))
""" Start traffic """
ixia_api.set_state(State(FlowTransmitState(state='start')))
""" Wait for traffic to finish """
time.sleep(duration_sec)
while True:
rows = ixia_api.get_flow_results(FlowRequest(flow_names=[flow_name]))
if len(rows) == 1 and \
rows[0]['name'] == flow_name and \
rows[0]['transmit'] == 'stopped':
""" Wait for counters to fully propagate """
time.sleep(2)
break
else:
time.sleep(1)
""" Dump per-flow statistics """
rows = ixia_api.get_flow_results(FlowRequest(flow_names=[flow_name]))
""" Stop traffic """
ixia_api.set_state(State(FlowTransmitState(state='stop')))
""" Analyze traffic results """
pytest_assert(
len(rows) == 1 and rows[0]['name'] == flow_name,
'Fail to get results of flow {}'.format(flow_name))
row = rows[0]
rx_frames = row['frames_rx']
tx_frames = row['frames_tx']
pytest_assert(
rx_frames == tx_frames,
'Unexpected packet losses (Tx: {}, Rx: {})'.format(
tx_frames, rx_frames))
tput_bps = port_speed_gbps * 1e9 * rate_percent / 100.0
exp_rx_frames = tput_bps * duration_sec / 8 / pkt_size
deviation_thresh = 0.05
ratio = float(exp_rx_frames) / rx_frames
deviation = abs(ratio - 1)
pytest_assert(
deviation <= deviation_thresh,
'Expected / Actual # of pkts: {} / {}'.format(exp_rx_frames,
rx_frames))
def test_tgen(ixia_api,
ixia_testbed_config,
conn_graph_facts,
fanout_graph_facts,
rand_one_dut_lossless_prio,
prio_dscp_map):
"""
Test if we can use Tgen API generate traffic in a testbed
Args:
ixia_api (pytest fixture): IXIA session
ixia_testbed_config (pytest fixture): testbed configuration information
conn_graph_facts (pytest fixture): connection graph
fanout_graph_facts (pytest fixture): fanout graph
rand_one_dut_lossless_prio (str): name of lossless priority to test
prio_dscp_map (pytest fixture): priority vs. DSCP map (key = priority)
Returns:
N/A
"""
testbed_config, port_config_list = ixia_testbed_config
dut_hostname, lossless_prio = rand_one_dut_lossless_prio.split('|')
pytest_require(len(port_config_list) >= 2, "This test requires at least 2 ports")
config = testbed_config
config.flows = __gen_all_to_all_traffic(testbed_config=testbed_config,
port_config_list=port_config_list,
dut_hostname=dut_hostname,
conn_data=conn_graph_facts,
fanout_data=fanout_graph_facts,
priority=int(lossless_prio),
prio_dscp_map=prio_dscp_map)
pkt_size = config.flows[0].size.fixed
rate_percent = config.flows[0].rate.value
duration_sec = config.flows[0].duration.seconds.seconds
port_speed = config.layer1[0].speed
words = port_speed.split('_')
pytest_assert(len(words) == 3 and words[1].isdigit(),
'Fail to get port speed from {}'.format(port_speed))
port_speed_gbps = int(words[1])
""" Apply configuration """
ixia_api.set_state(State(ConfigState(config=config, state='set')))
""" Start traffic """
ixia_api.set_state(State(FlowTransmitState(state='start')))
""" Wait for traffic to finish """
time.sleep(duration_sec)
attempts = 0
max_attempts = 20
all_flow_names = [flow.name for flow in config.flows]
while attempts < max_attempts:
rows = ixia_api.get_flow_results(FlowRequest(flow_names=all_flow_names))
""" If all the data flows have stopped """
transmit_states = [row['transmit'] for row in rows]
if len(rows) == len(all_flow_names) and\
list(set(transmit_states)) == ['stopped']:
time.sleep(2)
break
else:
time.sleep(1)
attempts += 1
pytest_assert(attempts < max_attempts,
"Flows do not stop in {} seconds".format(max_attempts))
""" Dump per-flow statistics """
rows = ixia_api.get_flow_results(FlowRequest(flow_names=all_flow_names))
ixia_api.set_state(State(FlowTransmitState(state='stop')))
""" Analyze traffic results """
for row in rows:
flow_name = row['name']
rx_frames = row['frames_rx']
tx_frames = row['frames_tx']
pytest_assert(rx_frames == tx_frames,
'packet losses for {} (Tx: {}, Rx: {})'.\
format(flow_name, tx_frames, rx_frames))
tput_bps = port_speed_gbps * 1e9 * rate_percent / 100.0
exp_rx_frames = tput_bps * duration_sec / 8 / pkt_size
deviation_thresh = 0.05
ratio = float(exp_rx_frames) / rx_frames
deviation = abs(ratio - 1)
pytest_assert(deviation <= deviation_thresh,
'Expected / Actual # of pkts for flow {}: {} / {}'.\
format(flow_name, exp_rx_frames, rx_frames))
