De-duplicate unidirection support 25/17625/13
authorVratko Polak <vrpolak@cisco.com>
Mon, 25 Feb 2019 12:00:43 +0000 (13:00 +0100)
committerPeter Mikus <pmikus@cisco.com>
Tue, 26 Feb 2019 10:33:02 +0000 (10:33 +0000)
- Latency is now reported in both directions.
-- For unidirection that means additional -1/-1/-1.
+ Changed function argument wrapping to save vertical space.
+ Changed trex command synthesys to save vertical space.
+ Fixed handling of command line arguments to avoid superfluous spaces.
+ More care distinguishing (0, 1) from (port_0, port_1).
- Not renaming the original port arguments.

Change-Id: I7b1736b594f6edea52eb07e5bc76ef52d0af92f8
Signed-off-by: Vratko Polak <vrpolak@cisco.com>
resources/libraries/python/TrafficGenerator.py
resources/tools/trex/trex_stateless_profile.py

index 6123b87..10fee9a 100644 (file)
@@ -1,4 +1,4 @@
-# Copyright (c) 2018 Cisco and/or its affiliates.
+# Copyright (c) 2019 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:
@@ -168,13 +168,14 @@ class TrafficGenerator(AbstractMeasurer):
         """
         return self._latency
 
-    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,
-                                     test_type,
-                                     tg_if1_dst_mac=None, tg_if2_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, test_type, tg_if1_dst_mac=None,
+            tg_if2_dst_mac=None):
         """TG initialization.
 
+        TODO: Document why do we need (and how do we use) _ifaces_reordered.
+
         :param tg_node: Traffic generator node.
         :param tg_if1: TG - name of first interface.
         :param tg_if2: TG - name of second interface.
@@ -386,9 +387,10 @@ class TrafficGenerator(AbstractMeasurer):
         if int(ret) != 0:
             raise RuntimeError('TRex stateless runtime error')
 
-    def trex_stl_start_remote_exec(self, duration, rate, framesize,
-                                   traffic_type, async_call=False,
-                                   latency=True, warmup_time=5.0):
+    def trex_stl_start_remote_exec(
+            self, duration, rate, framesize, traffic_type, async_call=False,
+            latency=True, warmup_time=5.0, unidirection=False, tx_port=0,
+            rx_port=1):
         """Execute script on remote node over ssh to start traffic.
 
         :param duration: Time expresed in seconds for how long to send traffic.
@@ -399,6 +401,11 @@ class TrafficGenerator(AbstractMeasurer):
         :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 tx_port: Traffic generator transmit port for first flow.
+            Default: 0
+        :param rx_port: Traffic generator receive port for first flow.
+            Default: 1
         :type duration: float
         :type rate: str
         :type framesize: str
@@ -406,34 +413,33 @@ class TrafficGenerator(AbstractMeasurer):
         :type async_call: bool
         :type latency: bool
         :type warmup_time: float
-        :returns: Nothing
+        :type unidirection: bool
+        :type tx_port: int
+        :type rx_port: int
         :raises RuntimeError: In case of TG driver issue.
         """
         ssh = SSH()
         ssh.connect(self._node)
+        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)
+        command = (
+            "sh -c '{tool}/resources/tools/trex/trex_stateless_profile.py"
+            " --profile {prof}/resources/traffic_profiles/trex/{traffic}.py"
+            " --duration {duration} --frame_size {framesize} --rate {rate}"
+            " --warmup_time {warmup} --port_0 {p_0} --port_1 {p_1}").format(
+                tool=Constants.REMOTE_FW_DIR, prof=Constants.REMOTE_FW_DIR,
+                traffic=traffic_type, duration=duration, framesize=framesize,
+                rate=rate, warmup=warmup_time, p_0=p_0, p_1=p_1)
+        if async_call:
+            command += " --async"
+        if latency:
+            command += " --latency"
+        if unidirection:
+            command += " --unidirection"
+        command += "'"
 
-        _async = "--async" if async_call else ""
-        _latency = "--latency" if latency else ""
-        _p0, _p1 = (2, 1) if self._ifaces_reordered else (1, 2)
-
-        profile_path = ("{0}/resources/traffic_profiles/trex/"
-                        "{1}.py".format(Constants.REMOTE_FW_DIR,
-                                        traffic_type))
         (ret, stdout, _) = ssh.exec_command(
-            "sh -c "
-            "'{0}/resources/tools/trex/trex_stateless_profile.py "
-            "--profile {1} "
-            "--duration {2} "
-            "--frame_size {3} "
-            "--rate {4} "
-            "--warmup_time {5} "
-            "--port_0 {6} "
-            "--port_1 {7} "
-            "{8} "   # --async
-            "{9}'".  # --latency
-            format(Constants.REMOTE_FW_DIR, profile_path, duration, framesize,
-                   rate, warmup_time, _p0 - 1, _p1 - 1, _async, _latency),
-            timeout=float(duration) + 60)
+            command, timeout=float(duration) + 60)
 
         if int(ret) != 0:
             raise RuntimeError('TRex stateless runtime error')
@@ -446,95 +452,15 @@ class TrafficGenerator(AbstractMeasurer):
         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])
 
-    def trex_stl_start_unidirection(
-            self, duration, rate, framesize, traffic_type, async_call=False,
-            latency=False, warmup_time=5.0, tx_port=0, rx_port=1):
-        """Execute script on remote node over ssh to start unidirection traffic.
-        The purpose of this function is to support performance test that need to
-        measure unidirectional traffic, e.g. Load balancer maglev mode and l3dsr
-        mode test.
-
-        :param duration: Time expresed in seconds for how long to send traffic.
-        :param rate: Traffic rate expressed with units (pps, %)
-        :param framesize: L2 frame size to send (without padding and IPG).
-        :param traffic_type: Module name as a traffic type identifier.
-            See resources/traffic_profiles/trex for implemented modules.
-        :param latency: With latency measurement.
-        :param async_call: If enabled then don't wait for all incomming trafic.
-        :param warmup_time: Warmup time period.
-        :param tx_port: Traffic generator transmit port.
-        :param rx_port: Traffic generator receive port.
-        :type duration: float
-        :type rate: str
-        :type framesize: str
-        :type traffic_type: str
-        :type latency: bool
-        :type async_call: bool
-        :type warmup_time: float
-        :type tx_port: integer
-        :type rx_port: integer
-        :raises RuntimeError: In case of TG driver issue.
-        """
-        ssh = SSH()
-        ssh.connect(self._node)
-
-        _latency = "--latency" if latency else ""
-        _async = "--async" if async_call else ""
-
-        profile_path = ("{0}/resources/traffic_profiles/trex/"
-                        "{1}.py".format(Constants.REMOTE_FW_DIR,
-                                        traffic_type))
-        (ret, stdout, _) = ssh.exec_command(
-            "sh -c "
-            "'{0}/resources/tools/trex/trex_stateless_profile.py "
-            "--profile {1} "
-            "--duration {2} "
-            "--frame_size {3} "
-            "--rate {4} "
-            "--warmup_time {5} "
-            "--port_0 {6} "
-            "--port_1 {7} "
-            "{8} "  # --async
-            "{9} "  # --latency
-            "{10}'".  # --unidirection
-            format(Constants.REMOTE_FW_DIR, profile_path, duration, framesize,
-                   rate, warmup_time, tx_port, rx_port, _async, _latency,
-                   "--unidirection"),
-            timeout=float(duration) + 60)
-
-        if int(ret) != 0:
-            raise RuntimeError('TRex unidirection runtime error')
-        elif async_call:
-            #no result
-            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])
-
     def stop_traffic_on_tg(self):
         """Stop all traffic on TG.
 
@@ -552,6 +478,19 @@ class TrafficGenerator(AbstractMeasurer):
             rx_port=1):
         """Send traffic from all configured interfaces on TG.
 
+        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.
+
+        Also note that traffic generator uses DPDK driver which might
+        reorder port numbers based on wiring and PCI numbering.
+        This method handles that, so argument values are invariant,
+        but you can see swapped valued in debug logs.
+
+        TODO: Is it better to have less descriptive argument names
+        just to make them less probable to be viewed as misleading or confusing?
+        See https://gerrit.fd.io/r/#/c/17625/11/resources/libraries/python/TrafficGenerator.py@406
+
         :param duration: Duration of test traffic generation in seconds.
         :param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...).
         :param framesize: Frame size (L2) in Bytes.
@@ -560,9 +499,11 @@ class TrafficGenerator(AbstractMeasurer):
         :param warmup_time: Warmup phase in seconds.
         :param async_call: Async mode.
         :param latency: With latency measurement.
-        :param unidirection: Traffic is unidirectional.
-        :param tx_port: Traffic generator transmit port.
-        :param rx_port: Traffic generator receive port.
+        :param unidirection: Traffic is unidirectional. Default: False
+        :param tx_port: Traffic generator transmit port for first flow.
+            Default: 0
+        :param rx_port: Traffic generator receive port for first flow.
+            Default: 1
         :type duration: str
         :type rate: str
         :type framesize: str
@@ -571,8 +512,8 @@ class TrafficGenerator(AbstractMeasurer):
         :type async_call: bool
         :type latency: bool
         :type unidirection: bool
-        :type tx_port: integer
-        :type rx_port: integer
+        :type tx_port: int
+        :type rx_port: int
         :returns: TG output.
         :rtype: str
         :raises RuntimeError: If TG is not set, or if node is not TG,
@@ -590,15 +531,9 @@ class TrafficGenerator(AbstractMeasurer):
         if node['subtype'] is None:
             raise RuntimeError('TG subtype not defined')
         elif node['subtype'] == NodeSubTypeTG.TREX:
-            if unidirection:
-                self.trex_stl_start_unidirection(duration, rate, framesize,
-                                                 traffic_type, tx_port,
-                                                 rx_port, async_call, latency,
-                                                 warmup_time)
-            else:
-                self.trex_stl_start_remote_exec(duration, rate, framesize,
-                                                traffic_type, async_call,
-                                                latency, warmup_time)
+            self.trex_stl_start_remote_exec(
+                duration, rate, framesize, traffic_type, async_call, latency,
+                warmup_time, unidirection, tx_port, rx_port)
         else:
             raise NotImplementedError("TG subtype not supported")
 
index de29ff5..61b244e 100755 (executable)
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 
-# Copyright (c) 2017 Cisco and/or its affiliates.
+# Copyright (c) 2019 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:
@@ -98,43 +98,6 @@ def simple_burst(profile_file, duration, framesize, rate, warmup_time, port_0,
     :type unidirection: bool
     """
 
-    #unidirection traffic
-    if unidirection:
-        send_traffic_unidirection(profile_file, duration, framesize, rate,
-                                  warmup_time, port_0, port_1, latency,
-                                  async_start)
-    #bidirection traffic
-    else:
-        send_traffic_bidirection(profile_file, duration, framesize, rate,
-                                 warmup_time, port_0, port_1, latency,
-                                 async_start)
-
-
-def send_traffic_bidirection(profile_file, duration, framesize, rate,
-                             warmup_time, port_0, port_1, latency,
-                             async_start=False):
-    """Send traffic bidirection and measure packet loss and latency.
-
-    :param profile_file: A python module with T-rex traffic profile.
-    :param framesize: Frame size.
-    :param duration: Duration of traffic run in seconds (-1=infinite).
-    :param rate: Traffic rate [percentage, pps, bps].
-    :param warmup_time: Traffic warm-up time in seconds, 0 = disable.
-    :param port_0: Port 0 on the traffic generator.
-    :param port_1: Port 1 on the traffic generator.
-    :param latency: With latency stats.
-    :param async_start: Start the traffic and exit.
-    :type profile_file: str
-    :type framesize: int or str
-    :type duration: float
-    :type rate: str
-    :type warmup_time: float
-    :type port_0: int
-    :type port_1: int
-    :type latency: bool
-    :type async_start: bool
-    """
-
     client = None
     total_rcvd = 0
     total_sent = 0
@@ -167,33 +130,37 @@ def send_traffic_bidirection(profile_file, duration, framesize, rate,
                                  resolve=False)
         if isinstance(framesize, int):
             client.add_streams(streams[0], ports=[port_0])
-            client.add_streams(streams[1], ports=[port_1])
+            if not unidirection:
+                client.add_streams(streams[1], ports=[port_1])
         elif isinstance(framesize, str):
             client.add_streams(streams[0:3], ports=[port_0])
-            client.add_streams(streams[3:6], ports=[port_1])
+            if not unidirection:
+                client.add_streams(streams[3:6], ports=[port_1])
         if latency:
             try:
                 if isinstance(framesize, int):
                     client.add_streams(streams[2], ports=[port_0])
-                    client.add_streams(streams[3], ports=[port_1])
+                    if not unidirection:
+                        client.add_streams(streams[3], ports=[port_1])
                 elif isinstance(framesize, str):
                     latency = False
             except STLError:
                 # Disable latency if NIC does not support requested stream type
                 print("##### FAILED to add latency streams #####")
                 latency = False
+        ports = [port_0]
+        if not unidirection:
+            ports.append(port_1)
         # Warm-up phase:
         if warmup_time > 0:
             # Clear the stats before injecting:
             client.clear_stats()
 
             # Choose rate and start traffic:
-            client.start(ports=[port_0, port_1], mult=rate,
-                         duration=warmup_time)
+            client.start(ports=ports, mult=rate, duration=warmup_time)
 
             # Block until done:
-            client.wait_on_traffic(ports=[port_0, port_1],
-                                   timeout=warmup_time+30)
+            client.wait_on_traffic(ports=ports, timeout=warmup_time+30)
 
             if client.get_warnings():
                 for warning in client.get_warnings():
@@ -206,11 +173,15 @@ def send_traffic_bidirection(profile_file, duration, framesize, rate,
             print(json.dumps(stats, indent=4, separators=(',', ': '),
                              sort_keys=True))
 
-            lost_a = stats[0]["opackets"] - stats[1]["ipackets"]
-            lost_b = stats[1]["opackets"] - stats[0]["ipackets"]
+            lost_a = stats[port_0]["opackets"] - stats[port_1]["ipackets"]
+            if not unidirection:
+                lost_b = stats[port_1]["opackets"] - stats[port_0]["ipackets"]
 
-            print("\npackets lost from 0 --> 1: {0} pkts".format(lost_a))
-            print("packets lost from 1 --> 0: {0} pkts".format(lost_b))
+            print("\npackets lost from {p_0} --> {p_1}: {v} pkts".format(
+                p_0=port_0, p_1=port_1, v=lost_a))
+            if not unidirection:
+                print("packets lost from {p_1} --> {p_0}: {v} pkts".format(
+                    p_0=port_0, p_1=port_1, v=lost_b))
 
         # Clear the stats before injecting:
         client.clear_stats()
@@ -218,11 +189,11 @@ def send_traffic_bidirection(profile_file, duration, framesize, rate,
         lost_b = 0
 
         # Choose rate and start traffic:
-        client.start(ports=[port_0, port_1], mult=rate, duration=duration)
+        client.start(ports=ports, mult=rate, duration=duration)
 
         if not async_start:
             # Block until done:
-            client.wait_on_traffic(ports=[port_0, port_1], timeout=duration+30)
+            client.wait_on_traffic(ports=ports, timeout=duration+30)
 
             if client.get_warnings():
                 for warning in client.get_warnings():
@@ -235,24 +206,33 @@ def send_traffic_bidirection(profile_file, duration, framesize, rate,
             print(json.dumps(stats, indent=4, separators=(',', ': '),
                              sort_keys=True))
 
-            lost_a = stats[0]["opackets"] - stats[1]["ipackets"]
-            lost_b = stats[1]["opackets"] - stats[0]["ipackets"]
+            lost_a = stats[port_0]["opackets"] - stats[port_1]["ipackets"]
+            if not unidirection:
+                lost_b = stats[port_1]["opackets"] - stats[port_0]["ipackets"]
 
             if latency:
                 lat_a = fmt_latency(
-                    str(stats["latency"][0]["latency"]["total_min"]),
-                    str(stats["latency"][0]["latency"]["average"]),
-                    str(stats["latency"][0]["latency"]["total_max"]))
-                lat_b = fmt_latency(
-                    str(stats["latency"][1]["latency"]["total_min"]),
-                    str(stats["latency"][1]["latency"]["average"]),
-                    str(stats["latency"][1]["latency"]["total_max"]))
-
-            total_sent = stats[0]["opackets"] + stats[1]["opackets"]
-            total_rcvd = stats[0]["ipackets"] + stats[1]["ipackets"]
-
-            print("\npackets lost from 0 --> 1:   {0} pkts".format(lost_a))
-            print("packets lost from 1 --> 0:   {0} pkts".format(lost_b))
+                    str(stats["latency"][port_0]["latency"]["total_min"]),
+                    str(stats["latency"][port_0]["latency"]["average"]),
+                    str(stats["latency"][port_0]["latency"]["total_max"]))
+                if not unidirection:
+                    lat_b = fmt_latency(
+                        str(stats["latency"][port_1]["latency"]["total_min"]),
+                        str(stats["latency"][port_1]["latency"]["average"]),
+                        str(stats["latency"][port_1]["latency"]["total_max"]))
+
+            if not unidirection:
+                total_sent = stats[0]["opackets"] + stats[1]["opackets"]
+                total_rcvd = stats[0]["ipackets"] + stats[1]["ipackets"]
+            else:
+                total_sent = stats[port_0]["opackets"]
+                total_rcvd = stats[port_1]["ipackets"]
+
+            print("\npackets lost from {p_0} --> {p_1}:   {v} pkts".format(
+                p_0=port_0, p_1=port_1, v=lost_a))
+            if not unidirection:
+                print("packets lost from {p_1} --> {p_0}:   {v} pkts".format(
+                p_0=port_0, p_1=port_1, v=lost_b))
 
     except STLError as err:
         sys.stderr.write("{0}\n".format(err))
@@ -272,161 +252,6 @@ def send_traffic_bidirection(profile_file, duration, framesize, rate,
                          lat_a, lat_b))
 
 
-def send_traffic_unidirection(profile_file, duration, framesize, rate,
-                              warmup_time, port_0, port_1, latency,
-                              async_start=False):
-    """Send traffic unidirection and measure packet loss and latency.
-
-    :param profile_file: A python module with T-rex traffic profile.
-    :param framesize: Frame size.
-    :param duration: Duration of traffic run in seconds (-1=infinite).
-    :param rate: Traffic rate [percentage, pps, bps].
-    :param warmup_time: Traffic warm-up time in seconds, 0 = disable.
-    :param port_0: Port 0 on the traffic generator.
-    :param port_1: Port 1 on the traffic generator.
-    :param latency: With latency stats.
-    :param async_start: Start the traffic and exit.
-    :type profile_file: str
-    :type framesize: int or str
-    :type duration: float
-    :type rate: str
-    :type warmup_time: float
-    :type port_0: int
-    :type port_1: int
-    :type latency: bool
-    :type async_start: bool
-    """
-
-    client = None
-    total_rcvd = 0
-    total_sent = 0
-    lost_a = 0
-    lat_a = "-1/-1/-1"
-
-    # Read the profile:
-    try:
-        print("### Profile file:\n{}".format(profile_file))
-        profile = STLProfile.load(profile_file, direction=0, port_id=0,
-                                  framesize=framesize)
-        streams = profile.get_streams()
-    except STLError as err:
-        print("Error while loading profile '{0}' {1}".format(profile_file, err))
-        sys.exit(1)
-
-    try:
-        # Create the client:
-        client = STLClient(verbose_level=LoggerApi.VERBOSE_QUIET)
-        # Connect to server:
-        client.connect()
-        # Prepare our ports:
-        if port_0 == port_1:
-            client.reset(ports=[port_0])
-            client.remove_all_streams(ports=[port_0])
-
-            if "macsrc" in profile_file:
-                client.set_port_attr(ports=[port_0], promiscuous=True,
-                                     resolve=False)
-        else:
-            client.reset(ports=[port_0, port_1])
-            client.remove_all_streams(ports=[port_0, port_1])
-
-            if "macsrc" in profile_file:
-                client.set_port_attr(ports=[port_0, port_1], promiscuous=True,
-                                     resolve=False)
-
-        if isinstance(framesize, int):
-            client.add_streams(streams[0], ports=[port_0])
-        elif isinstance(framesize, str):
-            client.add_streams(streams[0:3], ports=[port_0])
-        if latency:
-            try:
-                if isinstance(framesize, int):
-                    client.add_streams(streams[2], ports=[port_0])
-                elif isinstance(framesize, str):
-                    latency = False
-            except STLError:
-                # Disable latency if NIC does not support requested stream type
-                print("##### FAILED to add latency streams #####")
-                latency = False
-
-        # Warm-up phase:
-        if warmup_time > 0:
-            # Clear the stats before injecting:
-            client.clear_stats()
-
-            # Choose rate and start traffic:
-            client.start(ports=[port_0], mult=rate,
-                         duration=warmup_time)
-
-            # Block until done:
-            client.wait_on_traffic(ports=[port_0],
-                                   timeout=warmup_time+30)
-
-            if client.get_warnings():
-                for warning in client.get_warnings():
-                    print(warning)
-
-            # Read the stats after the test:
-            stats = client.get_stats()
-
-            print("##### Warmup statistics #####")
-            print(json.dumps(stats, indent=4, separators=(',', ': '),
-                             sort_keys=True))
-
-            lost_a = stats[port_0]["opackets"] - stats[port_1]["ipackets"]
-            print("\npackets lost : {0} pkts".format(lost_a))
-
-        # Clear the stats before injecting:
-        client.clear_stats()
-        lost_a = 0
-
-        # Choose rate and start traffic:
-        client.start(ports=[port_0], mult=rate, duration=duration)
-
-        if not async_start:
-            # Block until done:
-            client.wait_on_traffic(ports=[port_0], timeout=duration+30)
-
-            if client.get_warnings():
-                for warning in client.get_warnings():
-                    print(warning)
-
-            # Read the stats after the test
-            stats = client.get_stats()
-
-            print("##### Statistics #####")
-            print(json.dumps(stats, indent=4, separators=(',', ': '),
-                             sort_keys=True))
-
-            lost_a = stats[port_0]["opackets"] - stats[port_1]["ipackets"]
-
-            if latency:
-                lat_a = fmt_latency(
-                    str(stats["latency"][0]["latency"]["total_min"]),
-                    str(stats["latency"][0]["latency"]["average"]),
-                    str(stats["latency"][0]["latency"]["total_max"]))
-
-            total_sent = stats[port_0]["opackets"]
-            total_rcvd = stats[port_1]["ipackets"]
-
-            print("\npackets lost : {0} pkts".format(lost_a))
-
-    except STLError as err:
-        sys.stderr.write("{0}\n".format(err))
-        sys.exit(1)
-
-    finally:
-        if async_start:
-            if client:
-                client.disconnect(stop_traffic=False, release_ports=True)
-        else:
-            if client:
-                client.disconnect()
-            print("rate={0}, totalReceived={1}, totalSent={2}, "
-                  "frameLoss={3}, latencyStream0(usec)={4}".
-                  format(rate, total_rcvd, total_sent, lost_a, lat_a))
-
-
 def main():
     """Main function for the traffic generator using T-rex.
 

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