"""Performance testing traffic generator library."""
+import time
+
from robot.api import logger
from robot.libraries.BuiltIn import BuiltIn
__all__ = ['TGDropRateSearchImpl', 'TrafficGenerator', 'OptimizedSearch']
+def check_subtype(node):
+ """Return supported subtype of given node, or raise an exception.
+
+ Currently only one subtype is supported,
+ but we want our code to be ready for other ones.
+
+ :param node: Topology node to check. Can be None.
+ :type node: dict or NoneType
+ :returns: Subtype detected.
+ :rtype: NodeSubTypeTG
+ :raises RuntimeError: If node is not supported, message explains how.
+ """
+ if node.get('type') is None:
+ raise RuntimeError('Node type is not defined')
+ elif node['type'] != NodeType.TG:
+ raise RuntimeError('Node type is {typ!r}, not a TG'.format(
+ typ=node['type']))
+ elif node.get('subtype') is None:
+ raise RuntimeError('TG subtype is not defined')
+ elif node['subtype'] == NodeSubTypeTG.TREX:
+ return NodeSubTypeTG.TREX
+ raise RuntimeError('TG subtype {sub!r} is not supported'.format(
+ sub=node['subtype']))
+
+
class TGDropRateSearchImpl(DropRateSearch):
"""Drop Rate Search implementation."""
# to be able to use trex_stl-*()
tg_instance = BuiltIn().get_library_instance(
'resources.libraries.python.TrafficGenerator')
-
- if tg_instance.node['subtype'] is None:
- raise RuntimeError('TG subtype not defined')
- elif tg_instance.node['subtype'] == NodeSubTypeTG.TREX:
+ subtype = check_subtype(tg_instance.node)
+ if subtype == NodeSubTypeTG.TREX:
unit_rate = str(rate) + self.get_rate_type_str()
if skip_warmup:
- tg_instance.trex_stl_start_remote_exec(self.get_duration(),
- unit_rate, frame_size,
- traffic_profile,
- warmup_time=0.0)
+ tg_instance.trex_stl_start_remote_exec(
+ self.get_duration(), unit_rate, frame_size, traffic_profile,
+ warmup_time=0.0)
else:
- tg_instance.trex_stl_start_remote_exec(self.get_duration(),
- unit_rate, frame_size,
- traffic_profile)
+ tg_instance.trex_stl_start_remote_exec(
+ self.get_duration(), unit_rate, frame_size, traffic_profile)
loss = tg_instance.get_loss()
sent = tg_instance.get_sent()
if self.loss_acceptance_type_is_percentage():
loss = (float(loss) / float(sent)) * 100
-
- logger.trace("comparing: {} < {} {}".format(loss,
- loss_acceptance,
- loss_acceptance_type))
- if float(loss) > float(loss_acceptance):
- return False
- else:
- return True
- else:
- raise NotImplementedError("TG subtype not supported")
+ logger.trace("comparing: {los} < {acc} {typ}".format(
+ los=loss, acc=loss_acceptance, typ=loss_acceptance_type))
+ return float(loss) <= float(loss_acceptance)
def get_latency(self):
"""Returns min/avg/max latency.
ROBOT_LIBRARY_SCOPE = 'TEST SUITE'
def __init__(self):
+ # TODO: Number of fields will be reduced with CSIT-1378.
+ self._node = None
+ # T-REX interface order mapping
+ self._ifaces_reordered = False
+ # Result holding fields, to be removed.
self._result = None
self._loss = None
self._sent = None
self._latency = None
self._received = None
- self._node = None
- # T-REX interface order mapping
- self._ifaces_reordered = False
- # Parameters not given by measure().
+ # Measurement input fields, needed for async stop result.
+ self._start_time = None
+ self._rate = None
+ # Other input parameters, not knowable from measure() signature.
self.frame_size = None
self.traffic_profile = None
self.warmup_time = None
:returns: nothing
:raises RuntimeError: In case of issue during initialization.
"""
- if tg_node['type'] != NodeType.TG:
- raise RuntimeError('Node type is not a TG')
- self._node = tg_node
+ subtype = check_subtype(tg_node)
+ if subtype == NodeSubTypeTG.TREX:
+ self._node = tg_node
- if self._node['subtype'] == NodeSubTypeTG.TREX:
ssh = SSH()
ssh.connect(self._node)
:type osi_layer: str
:raises RuntimeError: If node subtype is not a TREX or startup failed.
"""
- if self._node['subtype'] != NodeSubTypeTG.TREX:
- raise RuntimeError('Node subtype is not a TREX!')
-
+ # No need to check subtype, we know it is TREX.
for _ in range(0, 3):
# Kill TRex only if it is already running.
cmd = "sh -c 'pgrep t-rex && pkill t-rex && sleep 3 || true'"
:rtype: bool
:raises RuntimeError: If node type is not a TG.
"""
- if node['type'] != NodeType.TG:
- raise RuntimeError('Node type is not a TG')
+ # No need to check subtype, we know it is TREX.
ssh = SSH()
ssh.connect(node)
:raises RuntimeError: If node type is not a TG,
or if TRex teardown fails.
"""
- if node['type'] != NodeType.TG:
- raise RuntimeError('Node type is not a TG')
- if node['subtype'] == NodeSubTypeTG.TREX:
+ subtype = check_subtype(node)
+ if subtype == NodeSubTypeTG.TREX:
ssh = SSH()
ssh.connect(node)
(ret, _, _) = ssh.exec_command(
if int(ret) != 0:
raise RuntimeError('pkill t-rex failed')
- @staticmethod
- def trex_stl_stop_remote_exec(node):
+ def _parse_traffic_results(self, stdout):
+ """Parse stdout of scripts into fieds of self.
+
+ Block of code to reuse, by sync start, or stop after async.
+ TODO: Is the output TG subtype dependent?
+
+ :param stdout: Text containing the standard output.
+ :type stdout: str
+ """
+ # last line from console output
+ line = stdout.splitlines()[-1]
+ self._result = line
+ logger.info('TrafficGen result: {0}'.format(self._result))
+ self._received = self._result.split(', ')[1].split('=')[1]
+ self._sent = self._result.split(', ')[2].split('=')[1]
+ self._loss = self._result.split(', ')[3].split('=')[1]
+ self._latency = []
+ self._latency.append(self._result.split(', ')[4].split('=')[1])
+ self._latency.append(self._result.split(', ')[5].split('=')[1])
+
+ def trex_stl_stop_remote_exec(self, node):
"""Execute script on remote node over ssh to stop running traffic.
+ Internal state is updated with results.
+
:param node: TRex generator node.
:type node: dict
:returns: Nothing
:raises RuntimeError: If stop traffic script fails.
"""
+ # No need to check subtype, we know it is TREX.
ssh = SSH()
ssh.connect(node)
- (ret, _, _) = ssh.exec_command(
+ (ret, stdout, _) = ssh.exec_command(
"sh -c '{}/resources/tools/trex/"
"trex_stateless_stop.py'".format(Constants.REMOTE_FW_DIR))
if int(ret) != 0:
raise RuntimeError('TRex stateless runtime error')
+ self._parse_traffic_results(stdout)
+
def trex_stl_start_remote_exec(
self, duration, rate, frame_size, traffic_profile, async_call=False,
latency=True, warmup_time=5.0, unidirection=False, tx_port=0,
:type rx_port: int
:raises RuntimeError: In case of TG driver issue.
"""
+ # No need to check subtype, we know it is TREX.
ssh = SSH()
ssh.connect(self._node)
reorder = self._ifaces_reordered # Just to make the next line fit.
raise RuntimeError('TRex stateless runtime error')
elif async_call:
#no result
+ self._start_time = time.time()
+ self._rate = float(rate[:-3]) if "pps" in rate else rate
self._received = None
self._sent = None
self._loss = None
self._latency = None
else:
- # last line from console output
- line = stdout.splitlines()[-1]
- self._result = line
- logger.info('TrafficGen result: {0}'.format(self._result))
- self._received = self._result.split(', ')[1].split('=')[1]
- self._sent = self._result.split(', ')[2].split('=')[1]
- self._loss = self._result.split(', ')[3].split('=')[1]
- self._latency = []
- self._latency.append(self._result.split(', ')[4].split('=')[1])
- self._latency.append(self._result.split(', ')[5].split('=')[1])
+ self._parse_traffic_results(stdout)
+ self._start_time = None
+ self._rate = None
def stop_traffic_on_tg(self):
"""Stop all traffic on TG.
:returns: Nothing
:raises RuntimeError: If TG is not set.
"""
- if self._node is None:
- raise RuntimeError("TG is not set")
- if self._node['subtype'] == NodeSubTypeTG.TREX:
+ subtype = check_subtype(self._node)
+ if subtype == NodeSubTypeTG.TREX:
self.trex_stl_stop_remote_exec(self._node)
def send_traffic_on_tg(
or if subtype is not specified.
:raises NotImplementedError: If TG is not supported.
"""
-
- node = self._node
- if node is None:
- raise RuntimeError("TG is not set")
-
- if node['type'] != NodeType.TG:
- raise RuntimeError('Node type is not a TG')
-
- if node['subtype'] is None:
- raise RuntimeError('TG subtype not defined')
- elif node['subtype'] == NodeSubTypeTG.TREX:
+ subtype = check_subtype(self._node)
+ if subtype == NodeSubTypeTG.TREX:
self.trex_stl_start_remote_exec(
duration, rate, frame_size, traffic_profile, async_call,
latency, warmup_time, unidirection, tx_port, rx_port)
- else:
- raise NotImplementedError("TG subtype not supported")
return self._result
self.traffic_profile = str(traffic_profile)
self.warmup_time = float(warmup_time)
+ def get_measurement_result(self, duration=None, transmit_rate=None):
+ """Return the result of last measurement as ReceiveRateMeasurement.
+
+ Separate function, as measurements can end either by time
+ or by explicit call, this is the common block at the end.
+
+ TODO: Fail on running or already reported measurement.
+
+ :param duration: Measurement duration [s] if known beforehand.
+ For explicitly stopped measurement it is estimated.
+ :param transmit_rate: Target aggregate transmit rate [pps].
+ If not given, computed assuming it was bidirectional.
+ :type duration: float or NoneType
+ :type transmit_rate: float or NoneType
+ :returns: Structure containing the result of the measurement.
+ :rtype: ReceiveRateMeasurement
+ """
+ if duration is None:
+ duration = time.time() - self._start_time
+ self._start_time = None
+ if transmit_rate is None:
+ # Assuming bi-directional traffic here.
+ transmit_rate = self._rate * 2.0
+ transmit_count = int(self.get_sent())
+ loss_count = int(self.get_loss())
+ measurement = ReceiveRateMeasurement(
+ duration, transmit_rate, transmit_count, loss_count)
+ measurement.latency = self.get_latency_int()
+ return measurement
+
def measure(self, duration, transmit_rate):
"""Run bi-directional measurement, parse and return results.
"""
duration = float(duration)
transmit_rate = float(transmit_rate)
- # Trex needs target Tr per stream, but reports aggregate Tx and Dx.
+ # TG needs target Tr per stream, but reports aggregate Tx and Dx.
unit_rate = str(transmit_rate / 2.0) + "pps"
self.send_traffic_on_tg(
duration, unit_rate, self.frame_size, self.traffic_profile,
warmup_time=self.warmup_time, latency=True)
- transmit_count = int(self.get_sent())
- loss_count = int(self.get_loss())
- measurement = ReceiveRateMeasurement(
- duration, transmit_rate, transmit_count, loss_count)
- measurement.latency = self.get_latency_int()
- return measurement
+ return self.get_measurement_result(duration, transmit_rate)
class OptimizedSearch(object):
Code Review / csit.git / blobdiff