Soak: Do not allow negative loss

[csit.git] / resources / libraries / python / TrafficGenerator.py

diff --git a/resources/libraries/python/TrafficGenerator.py b/resources/libraries/python/TrafficGenerator.py
index 334e299..c5192e2 100644 (file)
--- a/resources/libraries/python/TrafficGenerator.py
+++ b/resources/libraries/python/TrafficGenerator.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.

 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:


@@ -13,31 +13,61 @@
 
 """Performance testing traffic generator library."""
 
 
 """Performance testing traffic generator library."""
 

+import time
+

 from robot.api import logger
 from robot.libraries.BuiltIn import BuiltIn
 
 from robot.api import logger
 from robot.libraries.BuiltIn import BuiltIn
 

-from .DropRateSearch import DropRateSearch

 from .Constants import Constants
 from .Constants import Constants

-from .ssh import SSH, exec_cmd_no_error
-from .topology import NodeType
-from .topology import NodeSubTypeTG
-from .topology import Topology
+from .CpuUtils import CpuUtils
+from .DropRateSearch import DropRateSearch

 from .MLRsearch.AbstractMeasurer import AbstractMeasurer
 from .MLRsearch.MultipleLossRatioSearch import MultipleLossRatioSearch
 from .MLRsearch.ReceiveRateMeasurement import ReceiveRateMeasurement
 from .PLRsearch.PLRsearch import PLRsearch
 from .MLRsearch.AbstractMeasurer import AbstractMeasurer
 from .MLRsearch.MultipleLossRatioSearch import MultipleLossRatioSearch
 from .MLRsearch.ReceiveRateMeasurement import ReceiveRateMeasurement
 from .PLRsearch.PLRsearch import PLRsearch

+from .OptionString import OptionString
+from .ssh import exec_cmd_no_error, exec_cmd
+from .topology import NodeType
+from .topology import NodeSubTypeTG
+from .topology import Topology
+
+__all__ = [u"TGDropRateSearchImpl", u"TrafficGenerator", u"OptimizedSearch"]

 
 

-__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(u"type") is None:
+        msg = u"Node type is not defined"
+    elif node['type'] != NodeType.TG:
+        msg = f"Node type is {node[u'type']!r}, not a TG"
+    elif node.get(u"subtype") is None:
+        msg = u"TG subtype is not defined"
+    elif node[u"subtype"] != NodeSubTypeTG.TREX:
+        msg = f"TG subtype {node[u'subtype']!r} is not supported"
+    else:
+        return NodeSubTypeTG.TREX
+    raise RuntimeError(msg)

 
 
 class TGDropRateSearchImpl(DropRateSearch):
     """Drop Rate Search implementation."""
 
 
 
 class TGDropRateSearchImpl(DropRateSearch):
     """Drop Rate Search implementation."""
 

-    def __init__(self):
-        super(TGDropRateSearchImpl, self).__init__()
+    # def __init__(self):
+    #     super(TGDropRateSearchImpl, self).__init__()

 
 

-    def measure_loss(self, rate, frame_size, loss_acceptance,
-                     loss_acceptance_type, traffic_profile, skip_warmup=False):
+    def measure_loss(
+            self, rate, frame_size, loss_acceptance, loss_acceptance_type,
+            traffic_profile, skip_warmup=False):

         """Runs the traffic and evaluate the measured results.
 
         :param rate: Offered traffic load.
         """Runs the traffic and evaluate the measured results.
 
         :param rate: Offered traffic load.


@@ -45,7 +75,7 @@ class TGDropRateSearchImpl(DropRateSearch):
         :param loss_acceptance: Permitted drop ratio or frames count.
         :param loss_acceptance_type: Type of permitted loss.
         :param traffic_profile: Module name as a traffic profile identifier.
         :param loss_acceptance: Permitted drop ratio or frames count.
         :param loss_acceptance_type: Type of permitted loss.
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
+            See GPL/traffic_profiles/trex for implemented modules.

         :param skip_warmup: Start TRex without warmup traffic if true.
         :type rate: float
         :type frame_size: str
         :param skip_warmup: Start TRex without warmup traffic if true.
         :type rate: float
         :type frame_size: str


@@ -61,35 +91,29 @@ class TGDropRateSearchImpl(DropRateSearch):
         # we need instance of TrafficGenerator instantiated by Robot Framework
         # to be able to use trex_stl-*()
         tg_instance = BuiltIn().get_library_instance(
         # we need instance of TrafficGenerator instantiated by Robot Framework
         # 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:
+            u"resources.libraries.python.TrafficGenerator"
+        )
+        subtype = check_subtype(tg_instance.node)
+        if subtype == NodeSubTypeTG.TREX:

             unit_rate = str(rate) + self.get_rate_type_str()
             if skip_warmup:
             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:
             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
             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(
+                f"comparing: {loss} < {loss_acceptance} {loss_acceptance_type}"
+            )
+            return float(loss) <= float(loss_acceptance)
+        return False

 
     def get_latency(self):
         """Returns min/avg/max latency.
 
     def get_latency(self):
         """Returns min/avg/max latency.


@@ -98,10 +122,13 @@ class TGDropRateSearchImpl(DropRateSearch):
         :rtype: list
         """
         tg_instance = BuiltIn().get_library_instance(
         :rtype: list
         """
         tg_instance = BuiltIn().get_library_instance(

-            'resources.libraries.python.TrafficGenerator')
+            u"resources.libraries.python.TrafficGenerator"
+        )

         return tg_instance.get_latency_int()
 
 
         return tg_instance.get_latency_int()
 
 

+# TODO: Pylint says too-many-instance-attributes.
+# A fix is developed in https://gerrit.fd.io/r/c/csit/+/22221

 class TrafficGenerator(AbstractMeasurer):
     """Traffic Generator.
 
 class TrafficGenerator(AbstractMeasurer):
     """Traffic Generator.
 


@@ -111,21 +138,33 @@ class TrafficGenerator(AbstractMeasurer):
     # TODO: Remove "trex" from lines which could work with other TGs.
 
     # Use one instance of TrafficGenerator for all tests in test suite
     # TODO: Remove "trex" from lines which could work with other TGs.
 
     # Use one instance of TrafficGenerator for all tests in test suite

-    ROBOT_LIBRARY_SCOPE = 'TEST SUITE'
+    ROBOT_LIBRARY_SCOPE = u"TEST SUITE"

 
     def __init__(self):
 
     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._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().
+        self._approximated_rate = None
+        self._approximated_duration = None
+        # 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
         self.frame_size = None
         self.traffic_profile = None
         self.warmup_time = None

+        self.traffic_directions = None
+        self.negative_loss = None
+        # Transient data needed for async measurements.
+        self._xstats = (None, None)
+        # TODO: Rename "xstats" to something opaque, so TRex is not privileged?

 
     @property
     def node(self):
 
     @property
     def node(self):


@@ -168,6 +207,17 @@ class TrafficGenerator(AbstractMeasurer):
         """
         return self._latency
 
         """
         return self._latency
 

+    def get_approximated_rate(self):
+        """Return approximated rate computed as ratio of transmited packets over
+        duration of trial.
+
+        :returns: Approximated rate.
+        :rtype: str
+        """
+        return self._approximated_rate
+
+    # TODO: pylint says disable=too-many-locals.
+    # A fix is developed in https://gerrit.fd.io/r/c/csit/+/22221

     def initialize_traffic_generator(
             self, tg_node, tg_if1, tg_if2, tg_if1_adj_node, tg_if1_adj_if,
             tg_if2_adj_node, tg_if2_adj_if, osi_layer, tg_if1_dst_mac=None,
     def initialize_traffic_generator(
             self, tg_node, tg_if1, tg_if2, tg_if1_adj_node, tg_if1_adj_if,
             tg_if2_adj_node, tg_if2_adj_if, osi_layer, tg_if1_dst_mac=None,


@@ -199,44 +249,36 @@ class TrafficGenerator(AbstractMeasurer):
         :returns: nothing
         :raises RuntimeError: In case of issue during initialization.
         """
         :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
-
-        if self._node['subtype'] == NodeSubTypeTG.TREX:
-            ssh = SSH()
-            ssh.connect(self._node)
-
-            (ret, _, _) = ssh.exec_command(
-                "sudo -E sh -c '{0}/resources/tools/trex/"
-                "trex_installer.sh {1}'".format(Constants.REMOTE_FW_DIR,
-                                                Constants.TREX_INSTALL_VERSION),
-                timeout=1800)
-            if int(ret) != 0:
-                raise RuntimeError('TRex installation failed.')
+        subtype = check_subtype(tg_node)
+        if subtype == NodeSubTypeTG.TREX:
+            self._node = tg_node

 
             if1_pci = Topology().get_interface_pci_addr(self._node, tg_if1)
             if2_pci = Topology().get_interface_pci_addr(self._node, tg_if2)
             if1_addr = Topology().get_interface_mac(self._node, tg_if1)
             if2_addr = Topology().get_interface_mac(self._node, tg_if2)
 
 
             if1_pci = Topology().get_interface_pci_addr(self._node, tg_if1)
             if2_pci = Topology().get_interface_pci_addr(self._node, tg_if2)
             if1_addr = Topology().get_interface_mac(self._node, tg_if1)
             if2_addr = Topology().get_interface_mac(self._node, tg_if2)
 

-            if osi_layer == 'L2':
+            if osi_layer == u"L2":

                 if1_adj_addr = if2_addr
                 if2_adj_addr = if1_addr
                 if1_adj_addr = if2_addr
                 if2_adj_addr = if1_addr

-            elif osi_layer == 'L3':
-                if1_adj_addr = Topology().get_interface_mac(tg_if1_adj_node,
-                                                            tg_if1_adj_if)
-                if2_adj_addr = Topology().get_interface_mac(tg_if2_adj_node,
-                                                            tg_if2_adj_if)
-            elif osi_layer == 'L7':
+            elif osi_layer == u"L3":
+                if1_adj_addr = Topology().get_interface_mac(
+                    tg_if1_adj_node, tg_if1_adj_if
+                )
+                if2_adj_addr = Topology().get_interface_mac(
+                    tg_if2_adj_node, tg_if2_adj_if
+                )
+            elif osi_layer == u"L7":

                 if1_addr = Topology().get_interface_ip4(self._node, tg_if1)
                 if2_addr = Topology().get_interface_ip4(self._node, tg_if2)
                 if1_addr = Topology().get_interface_ip4(self._node, tg_if1)
                 if2_addr = Topology().get_interface_ip4(self._node, tg_if2)

-                if1_adj_addr = Topology().get_interface_ip4(tg_if1_adj_node,
-                                                            tg_if1_adj_if)
-                if2_adj_addr = Topology().get_interface_ip4(tg_if2_adj_node,
-                                                            tg_if2_adj_if)
+                if1_adj_addr = Topology().get_interface_ip4(
+                    tg_if1_adj_node, tg_if1_adj_if
+                )
+                if2_adj_addr = Topology().get_interface_ip4(
+                    tg_if2_adj_node, tg_if2_adj_if
+                )

             else:
             else:

-                raise ValueError("Unknown Test Type")
+                raise ValueError(u"Unknown Test Type")

 
             # in case of switched environment we can override MAC addresses
             if tg_if1_dst_mac is not None and tg_if2_dst_mac is not None:
 
             # in case of switched environment we can override MAC addresses
             if tg_if1_dst_mac is not None and tg_if2_dst_mac is not None:


@@ -249,103 +291,138 @@ class TrafficGenerator(AbstractMeasurer):
                 if1_adj_addr, if2_adj_addr = if2_adj_addr, if1_adj_addr
                 self._ifaces_reordered = True
 
                 if1_adj_addr, if2_adj_addr = if2_adj_addr, if1_adj_addr
                 self._ifaces_reordered = True
 

-            if osi_layer == 'L2' or osi_layer == 'L3':
-                (ret, _, _) = ssh.exec_command(
-                    "sudo sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
-                    "- version: 2\n"
-                    "  interfaces: [\"{0}\",\"{1}\"]\n"
-                    "  port_info:\n"
-                    "      - dest_mac: [{2}]\n"
-                    "        src_mac: [{3}]\n"
-                    "      - dest_mac: [{4}]\n"
-                    "        src_mac: [{5}]\n"
-                    "EOF'"\
-                    .format(if1_pci, if2_pci,
-                            "0x"+if1_adj_addr.replace(":", ",0x"),
-                            "0x"+if1_addr.replace(":", ",0x"),
-                            "0x"+if2_adj_addr.replace(":", ",0x"),
-                            "0x"+if2_addr.replace(":", ",0x")))
-            elif osi_layer == 'L7':
-                (ret, _, _) = ssh.exec_command(
-                    "sudo sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
-                    "- version: 2\n"
-                    "  interfaces: [\"{0}\",\"{1}\"]\n"
-                    "  port_info:\n"
-                    "      - ip: [{2}]\n"
-                    "        default_gw: [{3}]\n"
-                    "      - ip: [{4}]\n"
-                    "        default_gw: [{5}]\n"
-                    "EOF'"\
-                    .format(if1_pci, if2_pci,
-                            if1_addr, if1_adj_addr,
-                            if2_addr, if2_adj_addr))
+            master_thread_id, latency_thread_id, socket, threads = \
+                CpuUtils.get_affinity_trex(
+                    self._node, tg_if1, tg_if2,
+                    tg_dtc=Constants.TREX_CORE_COUNT)
+
+            if osi_layer in (u"L2", u"L3"):
+                dst_mac0 = f"0x{if1_adj_addr.replace(u':', u',0x')}"
+                src_mac0 = f"0x{if1_addr.replace(u':', u',0x')}"
+                dst_mac1 = f"0x{if2_adj_addr.replace(u':', u',0x')}"
+                src_mac1 = f"0x{if2_addr.replace(u':', u',0x')}"
+                exec_cmd_no_error(
+                    self._node,
+                    f"sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
+                    f"- version: 2\n"
+                    f"  c: {len(threads)}\n"
+                    f"  limit_memory: {Constants.TREX_LIMIT_MEMORY}\n"
+                    f"  interfaces: [\"{if1_pci}\",\"{if2_pci}\"]\n"
+                    f"  port_info:\n"
+                    f"      - dest_mac: [{dst_mac0}]\n"
+                    f"        src_mac: [{src_mac0}]\n"
+                    f"      - dest_mac: [{dst_mac1}]\n"
+                    f"        src_mac: [{src_mac1}]\n"
+                    f"  platform :\n"
+                    f"      master_thread_id: {master_thread_id}\n"
+                    f"      latency_thread_id: {latency_thread_id}\n"
+                    f"      dual_if:\n"
+                    f"          - socket: {socket}\n"
+                    f"            threads: {threads}\n"
+                    f"EOF'",
+                    sudo=True, message=u"TRex config generation!"
+                )
+            elif osi_layer == u"L7":
+                exec_cmd_no_error(
+                    self._node,
+                    f"sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
+                    f"- version: 2\n"
+                    f"  c: {len(threads)}\n"
+                    f"  limit_memory: {Constants.TREX_LIMIT_MEMORY}\n"
+                    f"  interfaces: [\"{if1_pci}\",\"{if2_pci}\"]\n"
+                    f"  port_info:\n"
+                    f"      - ip: [{if1_addr}]\n"
+                    f"        default_gw: [{if1_adj_addr}]\n"
+                    f"      - ip: [{if2_addr}]\n"
+                    f"        default_gw: [{if2_adj_addr}]\n"
+                    f"  platform :\n"
+                    f"      master_thread_id: {master_thread_id}\n"
+                    f"      latency_thread_id: {latency_thread_id}\n"
+                    f"      dual_if:\n"
+                    f"          - socket: {socket}\n"
+                    f"            threads: {threads}\n"
+                    f"EOF'",
+                    sudo=True, message=u"TRex config generation!"
+                )

             else:
             else:

-                raise ValueError("Unknown Test Type")
-            if int(ret) != 0:
-                raise RuntimeError('TRex config generation error')
+                raise ValueError(u"Unknown Test Type!")

 
 

-            self._startup_trex(osi_layer)
+            TrafficGenerator.startup_trex(
+                self._node, osi_layer, subtype=subtype
+            )

 
 

-    def _startup_trex(self, osi_layer):
+    @staticmethod
+    def startup_trex(tg_node, osi_layer, subtype=None):

         """Startup sequence for the TRex traffic generator.
 
         """Startup sequence for the TRex traffic generator.
 

+        :param tg_node: Traffic generator node.

         :param osi_layer: 'L2', 'L3' or 'L7' - OSI Layer testing type.
         :param osi_layer: 'L2', 'L3' or 'L7' - OSI Layer testing type.

+        :param subtype: Traffic generator sub-type.
+        :type tg_node: dict

         :type osi_layer: str
         :type osi_layer: str

+        :type subtype: NodeSubTypeTG

         :raises RuntimeError: If node subtype is not a TREX or startup failed.
         """
         :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!')
-
-        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'"
-            exec_cmd_no_error(
-                self._node, cmd, sudo=True, message='Kill TRex failed!')
-
-            # Configure TRex.
-            ports = ''
-            for port in self._node['interfaces'].values():
-                ports += ' {pci}'.format(pci=port.get('pci_address'))
+        if not subtype:
+            subtype = check_subtype(tg_node)
+        if subtype == NodeSubTypeTG.TREX:
+            for _ in range(0, 3):
+                # Kill TRex only if it is already running.
+                cmd = u"sh -c \"pgrep t-rex && pkill t-rex && sleep 3 || true\""
+                exec_cmd_no_error(
+                    tg_node, cmd, sudo=True, message=u"Kill TRex failed!"
+                )

 
 

-            cmd = ("sh -c 'cd {dir}/scripts/ && "
-                   "./dpdk_nic_bind.py -u {ports} || true'"
-                   .format(dir=Constants.TREX_INSTALL_DIR, ports=ports))
-            exec_cmd_no_error(
-                self._node, cmd, sudo=True,
-                message='Unbind PCI ports from driver failed!')
+                # Configure TRex.
+                ports = ''
+                for port in tg_node[u"interfaces"].values():
+                    ports += f" {port.get(u'pci_address')}"

 
 

-            cmd = ("sh -c 'cd {dir}/scripts/ && ./trex-cfg'"
-                   .format(dir=Constants.TREX_INSTALL_DIR))
-            exec_cmd_no_error(
-                self._node, cmd, sudo=True, message='Config TRex failed!')
-
-            # Start TRex.
-            cmd = ("sh -c 'cd {dir}/scripts/ && "
-                   "nohup ./t-rex-64 {mode} -i -c 7 > "
-                   "/tmp/trex.log 2>&1 &' > /dev/null"
-                   .format(dir=Constants.TREX_INSTALL_DIR,
-                           mode='--astf' if osi_layer == 'L7' else ''))
-            try:
-                exec_cmd_no_error(self._node, cmd, sudo=True)
-            except RuntimeError:
-                cmd = "sh -c 'cat /tmp/trex.log'"
-                exec_cmd_no_error(self._node, cmd, sudo=True,
-                                  message='Get TRex logs failed!')
-                raise RuntimeError('Start TRex failed!')
-
-            # Test if TRex starts successfuly.
-            cmd = ("sh -c '{dir}/resources/tools/trex/trex_server_info.py'"
-                   .format(dir=Constants.REMOTE_FW_DIR))
-            try:
+                cmd = f"sh -c \"cd {Constants.TREX_INSTALL_DIR}/scripts/ && " \
+                    f"./dpdk_nic_bind.py -u {ports} || true\""

                 exec_cmd_no_error(
                 exec_cmd_no_error(

-                    self._node, cmd, sudo=True, message='Test TRex failed!',
-                    retries=20)
-            except RuntimeError:
-                continue
-            return
-        # After max retries TRex is still not responding to API critical error
-        # occurred.
-        raise RuntimeError('Start TRex failed after multiple retries!')
+                    tg_node, cmd, sudo=True,
+                    message=u"Unbind PCI ports from driver failed!"
+                )
+
+                # Start TRex.
+                cd_cmd = f"cd '{Constants.TREX_INSTALL_DIR}/scripts/'"
+                trex_cmd = OptionString([u"nohup", u"./t-rex-64"])
+                trex_cmd.add(u"-i")
+                trex_cmd.add(u"--prefix $(hostname)")
+                trex_cmd.add(u"--hdrh")
+                trex_cmd.add(u"--no-scapy-server")
+                trex_cmd.add_if(u"--astf", osi_layer == u"L7")
+                # OptionString does not create double space if extra is empty.
+                trex_cmd.add(f"{Constants.TREX_EXTRA_CMDLINE}")
+                inner_command = f"{cd_cmd} && {trex_cmd} > /tmp/trex.log 2>&1 &"
+                cmd = f"sh -c \"{inner_command}\" > /dev/null"
+                try:
+                    exec_cmd_no_error(tg_node, cmd, sudo=True)
+                except RuntimeError:
+                    cmd = u"sh -c \"cat /tmp/trex.log\""
+                    exec_cmd_no_error(
+                        tg_node, cmd, sudo=True,
+                        message=u"Get TRex logs failed!"
+                    )
+                    raise RuntimeError(u"Start TRex failed!")
+
+                # Test if TRex starts successfuly.
+                command_line = OptionString().add(u"python3")
+                dirname = f"{Constants.REMOTE_FW_DIR}/GPL/tools/trex"
+                command_line.add(f"'{dirname}/trex_server_info.py'")
+                try:
+                    exec_cmd_no_error(
+                        tg_node, command_line, sudo=True,
+                        message=u"Test TRex failed!", retries=20
+                    )
+                except RuntimeError:
+                    continue
+                return
+            # After max retries TRex is still not responding to API critical
+            # error occurred.
+            exec_cmd(tg_node, u"cat /tmp/trex.log", sudo=True)
+            raise RuntimeError(u"Start TRex failed after multiple retries!")

 
     @staticmethod
     def is_trex_running(node):
 
     @staticmethod
     def is_trex_running(node):


@@ -357,12 +434,7 @@ class TrafficGenerator(AbstractMeasurer):
         :rtype: bool
         :raises RuntimeError: If node type is not a TG.
         """
         :rtype: bool
         :raises RuntimeError: If node type is not a TG.
         """

-        if node['type'] != NodeType.TG:
-            raise RuntimeError('Node type is not a TG')
-
-        ssh = SSH()
-        ssh.connect(node)
-        ret, _, _ = ssh.exec_command_sudo("pidof t-rex")
+        ret, _, _ = exec_cmd(node, u"pgrep t-rex", sudo=True)

         return bool(int(ret) == 0)
 
     @staticmethod
         return bool(int(ret) == 0)
 
     @staticmethod


@@ -375,50 +447,81 @@ class TrafficGenerator(AbstractMeasurer):
         :raises RuntimeError: If node type is not a TG,
             or if TRex teardown fails.
         """
         :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:
-            ssh = SSH()
-            ssh.connect(node)
-            (ret, _, _) = ssh.exec_command(
-                "sh -c 'sudo pkill t-rex && sleep 3'")
-            if int(ret) != 0:
-                raise RuntimeError('pkill t-rex failed')
+        subtype = check_subtype(node)
+        if subtype == NodeSubTypeTG.TREX:
+            exec_cmd_no_error(
+                node,
+                u"sh -c "
+                u"\"if pgrep t-rex; then sudo pkill t-rex && sleep 3; fi\"",
+                sudo=False,
+                message=u"pkill t-rex failed"
+            )

 
 

-    @staticmethod
-    def trex_stl_stop_remote_exec(node):
+    def _parse_traffic_results(self, stdout):
+        """Parse stdout of scripts into fields 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(f"TrafficGen result: {self._result}")
+        self._received = self._result.split(u", ")[1].split(u"=", 1)[1]
+        self._sent = self._result.split(u", ")[2].split(u"=", 1)[1]
+        self._loss = self._result.split(u", ")[3].split(u"=", 1)[1]
+        self._approximated_duration = \
+            self._result.split(u", ")[5].split(u"=", 1)[1]
+        self._approximated_rate = self._result.split(u", ")[6].split(u"=", 1)[1]
+        self._latency = list()
+        self._latency.append(self._result.split(u", ")[7].split(u"=", 1)[1])
+        self._latency.append(self._result.split(u", ")[8].split(u"=", 1)[1])
+
+    def trex_stl_stop_remote_exec(self, node):

         """Execute script on remote node over ssh to stop running traffic.
 
         """Execute script on remote node over ssh to stop running traffic.
 

+        Internal state is updated with measurement results.
+

         :param node: TRex generator node.
         :type node: dict
         :param node: TRex generator node.
         :type node: dict

-        :returns: Nothing

         :raises RuntimeError: If stop traffic script fails.
         """
         :raises RuntimeError: If stop traffic script fails.
         """

-        ssh = SSH()
-        ssh.connect(node)
-
-        (ret, _, _) = 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')
+        # No need to check subtype, we know it is TREX.
+        command_line = OptionString().add(u"python3")
+        dirname = f"{Constants.REMOTE_FW_DIR}/GPL/tools/trex"
+        command_line.add(f"'{dirname}/trex_stateless_stop.py'")
+        command_line.change_prefix(u"--")
+        for index, value in enumerate(self._xstats):
+            if value is not None:
+                value = value.replace(u"'", u"\"")
+                command_line.add_equals(f"xstat{index}", f"'{value}'")
+        stdout, _ = exec_cmd_no_error(
+            node, command_line, message=u"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,
 
     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,
+            latency=True, warmup_time=5.0, traffic_directions=2, tx_port=0,

             rx_port=1):
         """Execute script on remote node over ssh to start traffic.
 
             rx_port=1):
         """Execute script on remote node over ssh to start traffic.
 

+        In sync mode, measurement results are stored internally.
+        In async mode, initial data including xstats are stored internally.
+

         :param duration: Time expresed in seconds for how long to send traffic.
         :param rate: Traffic rate expressed with units (pps, %)
         :param frame_size: L2 frame size to send (without padding and IPG).
         :param traffic_profile: Module name as a traffic profile identifier.
         :param duration: Time expresed in seconds for how long to send traffic.
         :param rate: Traffic rate expressed with units (pps, %)
         :param frame_size: L2 frame size to send (without padding and IPG).
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
+            See GPL/traffic_profiles/trex for implemented modules.

         :param async_call: If enabled then don't wait for all incomming trafic.
         :param latency: With latency measurement.
         :param warmup_time: Warmup time period.
         :param async_call: If enabled then don't wait for all incomming trafic.
         :param latency: With latency measurement.
         :param warmup_time: Warmup time period.

-        :param unidirection: Traffic is unidirectional. Default: False
+        :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
+            Default: 2

         :param tx_port: Traffic generator transmit port for first flow.
             Default: 0
         :param rx_port: Traffic generator receive port for first flow.
         :param tx_port: Traffic generator transmit port for first flow.
             Default: 0
         :param rx_port: Traffic generator receive port for first flow.


@@ -430,80 +533,88 @@ class TrafficGenerator(AbstractMeasurer):
         :type async_call: bool
         :type latency: bool
         :type warmup_time: float
         :type async_call: bool
         :type latency: bool
         :type warmup_time: float

-        :type unidirection: bool
+        :type traffic_directions: int

         :type tx_port: int
         :type rx_port: int
         :raises RuntimeError: In case of TG driver issue.
         """
         :type tx_port: int
         :type rx_port: int
         :raises RuntimeError: In case of TG driver issue.
         """

-        ssh = SSH()
-        ssh.connect(self._node)
+        # No need to check subtype, we know it is TREX.

         reorder = self._ifaces_reordered  # Just to make the next line fit.
         p_0, p_1 = (rx_port, tx_port) if reorder else (tx_port, rx_port)
         reorder = self._ifaces_reordered  # Just to make the next line fit.
         p_0, p_1 = (rx_port, tx_port) if reorder else (tx_port, rx_port)

-        # Values from Robot can introduce type unicode,
-        # we need to encode them, so that repr() does not lead with 'u'.
-        if isinstance(rate, unicode):
-            rate = rate.encode("utf-8")
-        if isinstance(duration, unicode):
-            duration = duration.encode("utf-8")
-        if isinstance(warmup_time, unicode):
-            warmup_time = warmup_time.encode("utf-8")
-        command = (
-            "sh -c '{tool}/resources/tools/trex/trex_stateless_profile.py"
-            " --profile {prof}/resources/traffic_profiles/trex/{traffic}.py"
-            " --duration {duration!r} --frame_size {frame_size} --rate {rate!r}"
-            " --warmup_time {warmup!r} --port_0 {p_0} --port_1 {p_1}").format(
-                tool=Constants.REMOTE_FW_DIR, prof=Constants.REMOTE_FW_DIR,
-                traffic=traffic_profile, duration=duration,
-                frame_size=frame_size, rate=rate, warmup=warmup_time, p_0=p_0,
-                p_1=p_1)
+        if not isinstance(duration, (float, int)):
+            duration = float(duration)
+        if not isinstance(warmup_time, (float, int)):
+            warmup_time = float(warmup_time)
+
+        command_line = OptionString().add(u"python3")
+        dirname = f"{Constants.REMOTE_FW_DIR}/GPL/tools/trex"
+        command_line.add(f"'{dirname}/trex_stateless_profile.py'")
+        command_line.change_prefix(u"--")
+        dirname = f"{Constants.REMOTE_FW_DIR}/GPL/traffic_profiles/trex"
+        quoted_path = f"'{dirname}/{traffic_profile}.py'"
+        command_line.add_with_value(u"profile", quoted_path)
+        command_line.add_with_value(u"duration", f"{duration!r}")
+        command_line.add_with_value(u"frame_size", frame_size)
+        command_line.add_with_value(u"rate", f"{rate!r}")
+        command_line.add_with_value(u"warmup_time", f"{warmup_time!r}")
+        command_line.add_with_value(u"port_0", p_0)
+        command_line.add_with_value(u"port_1", p_1)
+        command_line.add_with_value(u"traffic_directions", traffic_directions)
+        command_line.add_if(u"async_start", async_call)
+        command_line.add_if(u"latency", latency)
+        command_line.add_if(u"force", Constants.TREX_SEND_FORCE)
+
+        stdout, _ = exec_cmd_no_error(
+            self._node, command_line, timeout=float(duration) + 60,
+            message=u"TRex stateless runtime error"
+        )
+
+        self.traffic_directions = traffic_directions

         if async_call:
         if async_call:

-            command += " --async"
-        if latency:
-            command += " --latency"
-        if unidirection:
-            command += " --unidirection"
-        command += "'"
-
-        (ret, stdout, _) = ssh.exec_command(
-            command, timeout=float(duration) + 60)
-
-        if int(ret) != 0:
-            raise RuntimeError('TRex stateless runtime error')
-        elif async_call:
-            #no result
+            # no result
+            self._start_time = time.time()
+            self._rate = float(rate[:-3]) if u"pps" in rate else float(rate)

             self._received = None
             self._sent = None
             self._loss = None
             self._latency = None
             self._received = None
             self._sent = None
             self._loss = None
             self._latency = None

+            xstats = [None, None]
+            index = 0
+            for line in stdout.splitlines():
+                if f"Xstats snapshot {index}: " in line:
+                    xstats[index] = line[19:]
+                    index += 1
+                if index == 2:
+                    break
+            self._xstats = tuple(xstats)

         else:
         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.
 
 
     def stop_traffic_on_tg(self):
         """Stop all traffic on TG.
 

-        :returns: Nothing
+        :returns: Structure containing the result of the measurement.
+        :rtype: ReceiveRateMeasurement

         :raises RuntimeError: If TG is not set.
         """
         :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)
             self.trex_stl_stop_remote_exec(self._node)

+        return self.get_measurement_result()

 
     def send_traffic_on_tg(
             self, duration, rate, frame_size, traffic_profile, warmup_time=5,
 
     def send_traffic_on_tg(
             self, duration, rate, frame_size, traffic_profile, warmup_time=5,

-            async_call=False, latency=True, unidirection=False, tx_port=0,
+            async_call=False, latency=True, traffic_directions=2, tx_port=0,

             rx_port=1):
         """Send traffic from all configured interfaces on TG.
 
             rx_port=1):
         """Send traffic from all configured interfaces on TG.
 

+        In async mode, xstats is stored internally,
+        to enable getting correct result when stopping the traffic.
+        In both modes, stdout is returned,
+        but _parse_traffic_results only works in sync output.
+

         Note that bidirectional traffic also contains flows
         transmitted from rx_port and received in tx_port.
         But some tests use asymmetric traffic, so those arguments are relevant.
         Note that bidirectional traffic also contains flows
         transmitted from rx_port and received in tx_port.
         But some tests use asymmetric traffic, so those arguments are relevant.


@@ -522,11 +633,12 @@ class TrafficGenerator(AbstractMeasurer):
         :param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...).
         :param frame_size: Frame size (L2) in Bytes.
         :param traffic_profile: Module name as a traffic profile identifier.
         :param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...).
         :param frame_size: Frame size (L2) in Bytes.
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
+            See GPL/traffic_profiles/trex for implemented modules.

         :param warmup_time: Warmup phase in seconds.
         :param async_call: Async mode.
         :param latency: With latency measurement.
         :param warmup_time: Warmup phase in seconds.
         :param async_call: Async mode.
         :param latency: With latency measurement.

-        :param unidirection: Traffic is unidirectional. Default: False
+        :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
+            Default: 2

         :param tx_port: Traffic generator transmit port for first flow.
             Default: 0
         :param rx_port: Traffic generator receive port for first flow.
         :param tx_port: Traffic generator transmit port for first flow.
             Default: 0
         :param rx_port: Traffic generator receive port for first flow.


@@ -538,7 +650,7 @@ class TrafficGenerator(AbstractMeasurer):
         :type warmup_time: float
         :type async_call: bool
         :type latency: bool
         :type warmup_time: float
         :type async_call: bool
         :type latency: bool

-        :type unidirection: bool
+        :type traffic_directions: int

         :type tx_port: int
         :type rx_port: int
         :returns: TG output.
         :type tx_port: int
         :type rx_port: int
         :returns: TG output.


@@ -547,22 +659,12 @@ class TrafficGenerator(AbstractMeasurer):
             or if subtype is not specified.
         :raises NotImplementedError: If TG is not supported.
         """
             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,
             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")
+                latency, warmup_time, traffic_directions, tx_port, rx_port
+            )

 
         return self._result
 
 
         return self._result
 


@@ -573,9 +675,9 @@ class TrafficGenerator(AbstractMeasurer):
         :raises Exception: If loss occured.
         """
         if self._loss is None:
         :raises Exception: If loss occured.
         """
         if self._loss is None:

-            raise RuntimeError('The traffic generation has not been issued')
-        if self._loss != '0':
-            raise RuntimeError('Traffic loss occurred: {0}'.format(self._loss))
+            raise RuntimeError(u"The traffic generation has not been issued")
+        if self._loss != u"0":
+            raise RuntimeError(f"Traffic loss occurred: {self._loss}")

 
     def fail_if_no_traffic_forwarded(self):
         """Fail if no traffic forwarded.
 
     def fail_if_no_traffic_forwarded(self):
         """Fail if no traffic forwarded.


@@ -584,12 +686,12 @@ class TrafficGenerator(AbstractMeasurer):
         :raises Exception: If no traffic forwarded.
         """
         if self._received is None:
         :raises Exception: If no traffic forwarded.
         """
         if self._received is None:

-            raise RuntimeError('The traffic generation has not been issued')
-        if self._received == '0':
-            raise RuntimeError('No traffic forwarded')
+            raise RuntimeError(u"The traffic generation has not been issued")
+        if self._received == u"0":
+            raise RuntimeError(u"No traffic forwarded")

 
 

-    def partial_traffic_loss_accepted(self, loss_acceptance,
-                                      loss_acceptance_type):
+    def partial_traffic_loss_accepted(
+            self, loss_acceptance, loss_acceptance_type):

         """Fail if loss is higher then accepted in traffic run.
 
         :param loss_acceptance: Permitted drop ratio or frames count.
         """Fail if loss is higher then accepted in traffic run.
 
         :param loss_acceptance: Permitted drop ratio or frames count.


@@ -600,40 +702,84 @@ class TrafficGenerator(AbstractMeasurer):
         :raises Exception: If loss is above acceptance criteria.
         """
         if self._loss is None:
         :raises Exception: If loss is above acceptance criteria.
         """
         if self._loss is None:

-            raise Exception('The traffic generation has not been issued')
+            raise Exception(u"The traffic generation has not been issued")

 
 

-        if loss_acceptance_type == 'percentage':
+        if loss_acceptance_type == u"percentage":

             loss = (float(self._loss) / float(self._sent)) * 100
             loss = (float(self._loss) / float(self._sent)) * 100

-        elif loss_acceptance_type == 'frames':
+        elif loss_acceptance_type == u"frames":

             loss = float(self._loss)
         else:
             loss = float(self._loss)
         else:

-            raise Exception('Loss acceptance type not supported')
+            raise Exception(u"Loss acceptance type not supported")

 
         if loss > float(loss_acceptance):
 
         if loss > float(loss_acceptance):

-            raise Exception("Traffic loss {} above loss acceptance: {}".format(
-                loss, loss_acceptance))
+            raise Exception(
+                f"Traffic loss {loss} above loss acceptance: {loss_acceptance}"
+            )

 
 

-    def set_rate_provider_defaults(self, frame_size, traffic_profile,
-                                   warmup_time=0.0):
+    def set_rate_provider_defaults(
+            self, frame_size, traffic_profile, warmup_time=0.0,
+            traffic_directions=2, negative_loss=True):

         """Store values accessed by measure().
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.
         """Store values accessed by measure().
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
+            See GPL/traffic_profiles/trex for implemented modules.

         :param warmup_time: Traffic duration before measurement starts [s].
         :param warmup_time: Traffic duration before measurement starts [s].

+        :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
+            Default: 2
+        :param negative_loss: If false, negative loss is reported as zero loss.

         :type frame_size: str or int
         :type traffic_profile: str
         :type warmup_time: float
         :type frame_size: str or int
         :type traffic_profile: str
         :type warmup_time: float

+        :type traffic_directions: int
+        :type negative_loss: bool

         """
         self.frame_size = frame_size
         self.traffic_profile = str(traffic_profile)
         self.warmup_time = float(warmup_time)
         """
         self.frame_size = frame_size
         self.traffic_profile = str(traffic_profile)
         self.warmup_time = float(warmup_time)

+        self.traffic_directions = traffic_directions
+        self.negative_loss = negative_loss
+
+    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:
+            transmit_rate = self._rate * self.traffic_directions
+        transmit_count = int(self.get_sent())
+        loss_count = int(self.get_loss())
+        if loss_count < 0 and not self.negative_loss:
+            loss_count = 0
+        measurement = ReceiveRateMeasurement(
+            duration, transmit_rate, transmit_count, loss_count
+        )
+        measurement.latency = self.get_latency_int()
+        measurement.approximated_rate = self.get_approximated_rate()
+        return measurement

 
     def measure(self, duration, transmit_rate):
 
     def measure(self, duration, transmit_rate):

-        """Run bi-directional measurement, parse and return results.
+        """Run trial measurement, parse and return aggregate results.
+
+        Aggregate means sum over traffic directions.

 
         :param duration: Trial duration [s].
 
         :param duration: Trial duration [s].

-        :param transmit_rate: Target bidirectional transmit rate [pps].
+        :param transmit_rate: Target aggregate transmit rate [pps].

         :type duration: float
         :type transmit_rate: float
         :returns: Structure containing the result of the measurement.
         :type duration: float
         :type transmit_rate: float
         :returns: Structure containing the result of the measurement.


@@ -644,21 +790,23 @@ class TrafficGenerator(AbstractMeasurer):
         """
         duration = float(duration)
         transmit_rate = float(transmit_rate)
         """
         duration = float(duration)
         transmit_rate = float(transmit_rate)

-        # Trex needs target Tr per stream, but reports aggregate Tx and Dx.
-        unit_rate = str(transmit_rate / 2.0) + "pps"
+        # TG needs target Tr per stream, but reports aggregate Tx and Dx.
+        unit_rate_int = transmit_rate / float(self.traffic_directions)
+        unit_rate_str = str(unit_rate_int) + u"pps"

         self.send_traffic_on_tg(
         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
+            duration, unit_rate_str, self.frame_size, self.traffic_profile,
+            warmup_time=self.warmup_time, latency=True,
+            traffic_directions=self.traffic_directions
+        )
+        return self.get_measurement_result(duration, transmit_rate)
+

 
 

+class OptimizedSearch:
+    """Class to be imported as Robot Library, containing search keywords.

 
 

-class OptimizedSearch(object):
-    """Class to be imported as Robot Library, containing a single keyword."""
+    Aside of setting up measurer and forwarding arguments,
+    the main business is to translate min/max rate from unidir to aggregate.
+    """

 
     @staticmethod
     def perform_optimized_ndrpdr_search(
 
     @staticmethod
     def perform_optimized_ndrpdr_search(


@@ -666,15 +814,15 @@ class OptimizedSearch(object):
             maximum_transmit_rate, packet_loss_ratio=0.005,
             final_relative_width=0.005, final_trial_duration=30.0,
             initial_trial_duration=1.0, number_of_intermediate_phases=2,
             maximum_transmit_rate, packet_loss_ratio=0.005,
             final_relative_width=0.005, final_trial_duration=30.0,
             initial_trial_duration=1.0, number_of_intermediate_phases=2,

-            timeout=720.0, doublings=1):
+            timeout=720.0, doublings=1, traffic_directions=2):

         """Setup initialized TG, perform optimized search, return intervals.
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.
         """Setup initialized TG, perform optimized search, return intervals.
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
-        :param minimum_transmit_rate: Minimal bidirectional
+            See GPL/traffic_profiles/trex for implemented modules.
+        :param minimum_transmit_rate: Minimal uni-directional

             target transmit rate [pps].
             target transmit rate [pps].

-        :param maximum_transmit_rate: Maximal bidirectional
+        :param maximum_transmit_rate: Maximal uni-directional

             target transmit rate [pps].
         :param packet_loss_ratio: Fraction of packets lost, for PDR [1].
         :param final_relative_width: Final lower bound transmit rate
             target transmit rate [pps].
         :param packet_loss_ratio: Fraction of packets lost, for PDR [1].
         :param final_relative_width: Final lower bound transmit rate


@@ -689,6 +837,8 @@ class OptimizedSearch(object):
         :param doublings: How many doublings to do in external search step.
             Default 1 is suitable for fairly stable tests,
             less stable tests might get better overal duration with 2 or more.
         :param doublings: How many doublings to do in external search step.
             Default 1 is suitable for fairly stable tests,
             less stable tests might get better overal duration with 2 or more.

+        :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
+            Default: 2

         :type frame_size: str or int
         :type traffic_profile: str
         :type minimum_transmit_rate: float
         :type frame_size: str or int
         :type traffic_profile: str
         :type minimum_transmit_rate: float


@@ -700,39 +850,47 @@ class OptimizedSearch(object):
         :type number_of_intermediate_phases: int
         :type timeout: float
         :type doublings: int
         :type number_of_intermediate_phases: int
         :type timeout: float
         :type doublings: int

+        :type traffic_directions: int

         :returns: Structure containing narrowed down NDR and PDR intervals
             and their measurements.
         :rtype: NdrPdrResult
         :raises RuntimeError: If total duration is larger than timeout.
         """
         :returns: Structure containing narrowed down NDR and PDR intervals
             and their measurements.
         :rtype: NdrPdrResult
         :raises RuntimeError: If total duration is larger than timeout.
         """

+        minimum_transmit_rate *= traffic_directions
+        maximum_transmit_rate *= traffic_directions

         # we need instance of TrafficGenerator instantiated by Robot Framework
         # to be able to use trex_stl-*()
         tg_instance = BuiltIn().get_library_instance(
         # we need instance of TrafficGenerator instantiated by Robot Framework
         # to be able to use trex_stl-*()
         tg_instance = BuiltIn().get_library_instance(

-            'resources.libraries.python.TrafficGenerator')
-        tg_instance.set_rate_provider_defaults(frame_size, traffic_profile)
+            u"resources.libraries.python.TrafficGenerator"
+        )
+        tg_instance.set_rate_provider_defaults(
+            frame_size, traffic_profile, traffic_directions=traffic_directions)

         algorithm = MultipleLossRatioSearch(
             measurer=tg_instance, final_trial_duration=final_trial_duration,
             final_relative_width=final_relative_width,
             number_of_intermediate_phases=number_of_intermediate_phases,
             initial_trial_duration=initial_trial_duration, timeout=timeout,
         algorithm = MultipleLossRatioSearch(
             measurer=tg_instance, final_trial_duration=final_trial_duration,
             final_relative_width=final_relative_width,
             number_of_intermediate_phases=number_of_intermediate_phases,
             initial_trial_duration=initial_trial_duration, timeout=timeout,

-            doublings=doublings)
+            doublings=doublings
+        )

         result = algorithm.narrow_down_ndr_and_pdr(
         result = algorithm.narrow_down_ndr_and_pdr(

-            minimum_transmit_rate, maximum_transmit_rate, packet_loss_ratio)
+            minimum_transmit_rate, maximum_transmit_rate, packet_loss_ratio
+        )

         return result
 
     @staticmethod
     def perform_soak_search(
             frame_size, traffic_profile, minimum_transmit_rate,
             maximum_transmit_rate, plr_target=1e-7, tdpt=0.1,
         return result
 
     @staticmethod
     def perform_soak_search(
             frame_size, traffic_profile, minimum_transmit_rate,
             maximum_transmit_rate, plr_target=1e-7, tdpt=0.1,

-            initial_count=50, timeout=1800.0, trace_enabled=False):
+            initial_count=50, timeout=1800.0, trace_enabled=False,
+            traffic_directions=2):

         """Setup initialized TG, perform soak search, return avg and stdev.
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.
         """Setup initialized TG, perform soak search, return avg and stdev.
 
         :param frame_size: Frame size identifier or value [B].
         :param traffic_profile: Module name as a traffic profile identifier.

-            See resources/traffic_profiles/trex for implemented modules.
-        :param minimum_transmit_rate: Minimal bidirectional
+            See GPL/traffic_profiles/trex for implemented modules.
+        :param minimum_transmit_rate: Minimal uni-directional

             target transmit rate [pps].
             target transmit rate [pps].

-        :param maximum_transmit_rate: Maximal bidirectional
+        :param maximum_transmit_rate: Maximal uni-directional

             target transmit rate [pps].
         :param plr_target: Fraction of packets lost to achieve [1].
         :param tdpt: Trial duration per trial.
             target transmit rate [pps].
         :param plr_target: Fraction of packets lost to achieve [1].
         :param tdpt: Trial duration per trial.


@@ -743,6 +901,9 @@ class OptimizedSearch(object):
             This is needed because initial "search" phase of integrator
             takes significant time even without any trial results.
         :param timeout: The search will stop after this overall time [s].
             This is needed because initial "search" phase of integrator
             takes significant time even without any trial results.
         :param timeout: The search will stop after this overall time [s].

+        :param trace_enabled: True if trace enabled else False.
+        :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
+            Default: 2

         :type frame_size: str or int
         :type traffic_profile: str
         :type minimum_transmit_rate: float
         :type frame_size: str or int
         :type traffic_profile: str
         :type minimum_transmit_rate: float


@@ -750,16 +911,24 @@ class OptimizedSearch(object):
         :type plr_target: float
         :type initial_count: int
         :type timeout: float
         :type plr_target: float
         :type initial_count: int
         :type timeout: float

-        :returns: Average and stdev of estimated bidirectional rate giving PLR.
+        :type trace_enabled: bool
+        :type traffic_directions: int
+        :returns: Average and stdev of estimated aggregate rate giving PLR.

         :rtype: 2-tuple of float
         """
         :rtype: 2-tuple of float
         """

+        minimum_transmit_rate *= traffic_directions
+        maximum_transmit_rate *= traffic_directions

         tg_instance = BuiltIn().get_library_instance(
         tg_instance = BuiltIn().get_library_instance(

-            'resources.libraries.python.TrafficGenerator')
-        tg_instance.set_rate_provider_defaults(frame_size, traffic_profile)
+            u"resources.libraries.python.TrafficGenerator"
+        )
+        tg_instance.set_rate_provider_defaults(
+            frame_size, traffic_profile, traffic_directions=traffic_directions,
+            negative_loss=False)

         algorithm = PLRsearch(
             measurer=tg_instance, trial_duration_per_trial=tdpt,
             packet_loss_ratio_target=plr_target,
             trial_number_offset=initial_count, timeout=timeout,
         algorithm = PLRsearch(
             measurer=tg_instance, trial_duration_per_trial=tdpt,
             packet_loss_ratio_target=plr_target,
             trial_number_offset=initial_count, timeout=timeout,

-            trace_enabled=trace_enabled)
+            trace_enabled=trace_enabled
+        )

         result = algorithm.search(minimum_transmit_rate, maximum_transmit_rate)
         return result
         result = algorithm.search(minimum_transmit_rate, maximum_transmit_rate)
         return result