- port = self.generator.port_num(intf)
- self.ports.append(port)
- self.generator.client.add_streams(self.get_streams(profile_data), ports=port)
-
- self.max_rate = self.rate
- self.min_rate = 0
- self.generator.client.start(ports=self.ports, mult=self.get_multiplier(),
- duration=30, force=True)
- self.drop_percent_at_max_tx = 0
- self.throughput_max = 0
-
- def get_multiplier(self):
- """ Get the rate at which next iteration to run """
- self.rate = round((self.max_rate + self.min_rate) / 2.0, 2)
- multiplier = round(self.rate / self.pps, 2)
- return str(multiplier)
-
- def get_drop_percentage(self, generator=None):
- """ Calculate the drop percentage and run the traffic """
- if generator is None:
- generator = self.generator
- run_duration = self.generator.RUN_DURATION
- samples = self.generator.generate_samples(self.ports)
-
- in_packets = sum([value['in_packets'] for value in samples.values()])
- out_packets = sum([value['out_packets'] for value in samples.values()])
-
- packet_drop = abs(out_packets - in_packets)
+ port_num = int(self.generator.port_num(intf))
+ ports.append(port_num)
+ port_pg_id.add_port(port_num)
+ profile = self._create_profile(profile_data,
+ self.rate, port_pg_id,
+ self.config.enable_latency)
+ self.generator.client.add_streams(profile, ports=[port_num])
+
+ self.generator.client.start(ports=ports,
+ duration=self.config.duration,
+ force=True)
+ return ports, port_pg_id
+
+ def _create_profile(self, profile_data, rate, port_pg_id, enable_latency):
+ """Create a STL profile (list of streams) for a port"""
+ streams = []
+ for packet_name in profile_data:
+ imix = (profile_data[packet_name].
+ get('outer_l2', {}).get('framesize'))
+ imix_data = self._create_imix_data(imix)
+ self._create_vm(profile_data[packet_name])
+ _streams = self._create_streams(imix_data, rate, port_pg_id,
+ enable_latency)
+ streams.extend(_streams)
+ return trex_stl_streams.STLProfile(streams)
+
+ def _create_imix_data(self, imix,
+ weight_mode=constants.DISTRIBUTION_IN_PACKETS):
+ """Generate the IMIX distribution for a STL profile
+
+ The input information is the framesize dictionary in a test case
+ traffic profile definition. E.g.:
+ downlink_0:
+ ipv4:
+ id: 2
+ outer_l2:
+ framesize:
+ 64B: 10
+ 128B: 20
+ ...
+
+ This function normalizes the sum of framesize weights to 100 and
+ returns a dictionary of frame sizes in bytes and weight in percentage.
+ E.g.:
+ imix_count = {64: 25, 128: 75}
+
+ The weight mode is described in [1]. There are two ways to describe the
+ weight of the packets:
+ - Distribution in packets: the weight defines the percentage of
+ packets sent per packet size. IXIA uses this definition.
+ - Distribution in bytes: the weight defines the percentage of bytes
+ sent per packet size.
+
+ Packet size # packets D. in packets Bytes D. in bytes
+ 40 7 58.33% 280 7%
+ 576 4 33.33% 2304 56%
+ 1500 1 8.33% 1500 37%
+
+ [1] https://en.wikipedia.org/wiki/Internet_Mix
+
+ :param imix: (dict) IMIX size and weight
+ """
+ imix_count = {}
+ if not imix:
+ return imix_count
+
+ imix_count = {size.upper().replace('B', ''): int(weight)
+ for size, weight in imix.items()}
+ imix_sum = sum(imix_count.values())
+ if imix_sum <= 0:
+ imix_count = {64: 100}
+ imix_sum = 100
+
+ weight_normalize = float(imix_sum) / 100
+ imix_dip = {size: float(weight) / weight_normalize
+ for size, weight in imix_count.items()}
+
+ if weight_mode == constants.DISTRIBUTION_IN_BYTES:
+ return imix_dip
+
+ byte_total = sum([int(size) * weight
+ for size, weight in imix_dip.items()])
+ return {size: (int(size) * weight * 100) / byte_total
+ for size, weight in imix_dip.items()}
+
+ def _create_vm(self, packet_definition):
+ """Create the STL Raw instructions"""
+ self.ether_packet = Pkt.Ether()
+ self.ip_packet = Pkt.IP()
+ self.ip6_packet = None
+ self.udp_packet = Pkt.UDP()
+ self.udp[DST_PORT] = 'UDP.dport'
+ self.udp[SRC_PORT] = 'UDP.sport'
+ self.qinq = False
+ self.vm_flow_vars = []
+ outer_l2 = packet_definition.get('outer_l2')
+ outer_l3v4 = packet_definition.get('outer_l3v4')
+ outer_l3v6 = packet_definition.get('outer_l3v6')
+ outer_l4 = packet_definition.get('outer_l4')
+ if outer_l2:
+ self._set_outer_l2_fields(outer_l2)
+ if outer_l3v4:
+ self._set_outer_l3v4_fields(outer_l3v4)
+ if outer_l3v6:
+ self._set_outer_l3v6_fields(outer_l3v6)
+ if outer_l4:
+ self._set_outer_l4_fields(outer_l4)
+ self.trex_vm = trex_stl_packet_builder_scapy.STLScVmRaw(
+ self.vm_flow_vars)
+
+ def _create_single_packet(self, size=64):
+ size -= 4
+ ether_packet = self.ether_packet
+ ip_packet = self.ip6_packet if self.ip6_packet else self.ip_packet
+ udp_packet = self.udp_packet
+ if self.qinq:
+ qinq_packet = self.qinq_packet
+ base_pkt = ether_packet / qinq_packet / ip_packet / udp_packet
+ else:
+ base_pkt = ether_packet / ip_packet / udp_packet
+ pad = max(0, size - len(base_pkt)) * 'x'
+ return trex_stl_packet_builder_scapy.STLPktBuilder(
+ pkt=base_pkt / pad, vm=self.trex_vm)
+
+ def _create_streams(self, imix_data, rate, port_pg_id, enable_latency):
+ """Create a list of streams per packet size
+
+ The STL TX mode speed of the generated streams will depend on the frame
+ weight and the frame rate. Both the frame weight and the total frame
+ rate are normalized to 100. The STL TX mode speed, defined in
+ percentage, is the combitation of both percentages. E.g.:
+ frame weight = 100
+ rate = 90
+ --> STLTXmode percentage = 10 (%)
+
+ frame weight = 80
+ rate = 50
+ --> STLTXmode percentage = 40 (%)
+
+ :param imix_data: (dict) IMIX size and weight
+ :param rate: (float) normalized [0..100] total weight
+ :param pg_id: (PortPgIDMap) port / pg_id (list) map
+ """
+ streams = []
+ for size, weight in ((int(size), float(weight)) for (size, weight)
+ in imix_data.items() if float(weight) > 0):
+ packet = self._create_single_packet(size)
+ pg_id = port_pg_id.increase_pg_id()
+ stl_flow = (trex_stl_streams.STLFlowLatencyStats(pg_id=pg_id) if
+ enable_latency else None)
+ mode = trex_stl_streams.STLTXCont(percentage=weight * rate / 100)
+ streams.append(trex_stl_client.STLStream(
+ packet=packet, flow_stats=stl_flow, mode=mode))
+ return streams
+
+ def get_drop_percentage(self, samples, tol_low, tol_high,
+ correlated_traffic):
+ """Calculate the drop percentage and run the traffic"""
+ completed = False
+ out_pkt_end = sum(port['out_packets'] for port in samples[-1].values())
+ in_pkt_end = sum(port['in_packets'] for port in samples[-1].values())
+ out_pkt_ini = sum(port['out_packets'] for port in samples[0].values())
+ in_pkt_ini = sum(port['in_packets'] for port in samples[0].values())
+ time_diff = (list(samples[-1].values())[0]['timestamp'] -
+ list(samples[0].values())[0]['timestamp']).total_seconds()
+ out_packets = out_pkt_end - out_pkt_ini
+ in_packets = in_pkt_end - in_pkt_ini
+ tx_rate_fps = float(out_packets) / time_diff
+ rx_rate_fps = float(in_packets) / time_diff