1 # Copyright 2016 Cisco Systems, Inc. All rights reserved.
3 # Licensed under the Apache License, Version 2.0 (the "License"); you may
4 # not use this file except in compliance with the License. You may obtain
5 # a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 # License for the specific language governing permissions and limitations
20 from itertools import count
21 from nfvbench.log import LOG
22 from nfvbench.specs import ChainType
23 from nfvbench.traffic_server import TRexTrafficServer
24 from nfvbench.utils import cast_integer
25 from nfvbench.utils import timeout
26 from nfvbench.utils import TimeoutError
27 from traffic_base import AbstractTrafficGenerator
28 from traffic_base import TrafficGeneratorException
29 import traffic_utils as utils
31 # pylint: disable=import-error
32 from trex_stl_lib.api import CTRexVmInsFixHwCs
33 from trex_stl_lib.api import Dot1Q
34 from trex_stl_lib.api import Ether
35 from trex_stl_lib.api import IP
36 from trex_stl_lib.api import STLClient
37 from trex_stl_lib.api import STLError
38 from trex_stl_lib.api import STLFlowLatencyStats
39 from trex_stl_lib.api import STLFlowStats
40 from trex_stl_lib.api import STLPktBuilder
41 from trex_stl_lib.api import STLScVmRaw
42 from trex_stl_lib.api import STLStream
43 from trex_stl_lib.api import STLTXCont
44 from trex_stl_lib.api import STLVmFixChecksumHw
45 from trex_stl_lib.api import STLVmFlowVar
46 from trex_stl_lib.api import STLVmFlowVarRepetableRandom
47 from trex_stl_lib.api import STLVmWrFlowVar
48 from trex_stl_lib.api import UDP
49 from trex_stl_lib.services.trex_stl_service_arp import STLServiceARP
52 # pylint: enable=import-error
55 class TRex(AbstractTrafficGenerator):
56 """TRex traffic generator driver."""
59 CHAIN_PG_ID_MASK = 0x007F
60 PORT_PG_ID_MASK = 0x0080
61 LATENCY_PG_ID_MASK = 0x0100
63 def __init__(self, traffic_client):
64 AbstractTrafficGenerator.__init__(self, traffic_client)
68 self.chain_count = self.generator_config.service_chain_count
70 # A dict of list of dest macs indexed by port#
71 # the dest macs in the list are indexed by the chain id
73 self.capture_id = None
76 def get_version(self):
77 """Get the Trex version."""
78 return self.client.get_server_version()
80 def get_pg_id(self, port, chain_id):
81 """Calculate the packet group IDs to use for a given port/stream type/chain_id.
84 chain_id: identifies to which chain the pg_id is associated (0 to 255)
85 return: pg_id, lat_pg_id
87 We use a bit mask to set up the 3 fields:
88 0x007F: chain ID (8 bits for a max of 128 chains)
92 pg_id = port * TRex.PORT_PG_ID_MASK | chain_id
93 return pg_id, pg_id | TRex.LATENCY_PG_ID_MASK
95 def extract_stats(self, in_stats):
96 """Extract stats from dict returned by Trex API.
98 :param in_stats: dict as returned by TRex api
100 utils.nan_replace(in_stats)
101 # LOG.debug(in_stats)
104 # port_handles should have only 2 elements: [0, 1]
105 # so (1 - ph) will be the index for the far end port
106 for ph in self.port_handle:
108 far_end_stats = in_stats[1 - ph]
111 'total_pkts': cast_integer(stats['opackets']),
112 'total_pkt_bytes': cast_integer(stats['obytes']),
113 'pkt_rate': cast_integer(stats['tx_pps']),
114 'pkt_bit_rate': cast_integer(stats['tx_bps'])
117 'total_pkts': cast_integer(stats['ipackets']),
118 'total_pkt_bytes': cast_integer(stats['ibytes']),
119 'pkt_rate': cast_integer(stats['rx_pps']),
120 'pkt_bit_rate': cast_integer(stats['rx_bps']),
121 # how many pkts were dropped in RX direction
122 # need to take the tx counter on the far end port
123 'dropped_pkts': cast_integer(
124 far_end_stats['opackets'] - stats['ipackets'])
127 self.__combine_latencies(in_stats, result[ph]['rx'], ph)
129 total_tx_pkts = result[0]['tx']['total_pkts'] + result[1]['tx']['total_pkts']
130 result["total_tx_rate"] = cast_integer(total_tx_pkts / self.config.duration_sec)
131 result["flow_stats"] = in_stats["flow_stats"]
132 result["latency"] = in_stats["latency"]
135 def get_stream_stats(self, trex_stats, if_stats, latencies, chain_idx):
136 """Extract the aggregated stats for a given chain.
138 trex_stats: stats as returned by get_stats()
139 if_stats: a list of 2 interface stats to update (port 0 and 1)
140 latencies: a list of 2 Latency instances to update for this chain (port 0 and 1)
141 latencies[p] is the latency for packets sent on port p
142 if there are no latency streams, the Latency instances are not modified
143 chain_idx: chain index of the interface stats
145 The packet counts include normal and latency streams.
147 Trex returns flows stats as follows:
149 'flow_stats': {0: {'rx_bps': {0: 0, 1: 0, 'total': 0},
150 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
151 'rx_bytes': {0: nan, 1: nan, 'total': nan},
152 'rx_pkts': {0: 0, 1: 15001, 'total': 15001},
153 'rx_pps': {0: 0, 1: 0, 'total': 0},
154 'tx_bps': {0: 0, 1: 0, 'total': 0},
155 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
156 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068},
157 'tx_pkts': {0: 15001, 1: 0, 'total': 15001},
158 'tx_pps': {0: 0, 1: 0, 'total': 0}},
159 1: {'rx_bps': {0: 0, 1: 0, 'total': 0},
160 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
161 'rx_bytes': {0: nan, 1: nan, 'total': nan},
162 'rx_pkts': {0: 0, 1: 15001, 'total': 15001},
163 'rx_pps': {0: 0, 1: 0, 'total': 0},
164 'tx_bps': {0: 0, 1: 0, 'total': 0},
165 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
166 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068},
167 'tx_pkts': {0: 15001, 1: 0, 'total': 15001},
168 'tx_pps': {0: 0, 1: 0, 'total': 0}},
169 128: {'rx_bps': {0: 0, 1: 0, 'total': 0},
170 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
171 'rx_bytes': {0: nan, 1: nan, 'total': nan},
172 'rx_pkts': {0: 15001, 1: 0, 'total': 15001},
173 'rx_pps': {0: 0, 1: 0, 'total': 0},
174 'tx_bps': {0: 0, 1: 0, 'total': 0},
175 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
176 'tx_bytes': {0: 0, 1: 1020068, 'total': 1020068},
177 'tx_pkts': {0: 0, 1: 15001, 'total': 15001},
178 'tx_pps': {0: 0, 1: 0, 'total': 0}},etc...
180 the pg_id (0, 1, 128,...) is the key of the dict and is obtained using the
182 packet counters for a given stream sent on port p are reported as:
183 - tx_pkts[p] on port p
184 - rx_pkts[1-p] on the far end port
186 This is a tricky/critical counter transposition operation because
187 the results are grouped by port (not by stream):
188 tx_pkts_port(p=0) comes from pg_id(port=0, chain_idx)['tx_pkts'][0]
189 rx_pkts_port(p=0) comes from pg_id(port=1, chain_idx)['rx_pkts'][0]
190 tx_pkts_port(p=1) comes from pg_id(port=1, chain_idx)['tx_pkts'][1]
191 rx_pkts_port(p=1) comes from pg_id(port=0, chain_idx)['rx_pkts'][1]
193 or using a more generic formula:
194 tx_pkts_port(p) comes from pg_id(port=p, chain_idx)['tx_pkts'][p]
195 rx_pkts_port(p) comes from pg_id(port=1-p, chain_idx)['rx_pkts'][p]
197 the second formula is equivalent to
198 rx_pkts_port(1-p) comes from pg_id(port=p, chain_idx)['rx_pkts'][1-p]
200 If there are latency streams, those same counters need to be added in the same way
204 for port in range(2):
205 pg_id, lat_pg_id = self.get_pg_id(port, chain_idx)
206 for pid in [pg_id, lat_pg_id]:
208 pg_stats = trex_stats['flow_stats'][pid]
209 if_stats[port].tx += pg_stats['tx_pkts'][port]
210 if_stats[1 - port].rx += pg_stats['rx_pkts'][1 - port]
214 lat = trex_stats['latency'][lat_pg_id]['latency']
215 # dropped_pkts += lat['err_cntrs']['dropped']
216 latencies[port].max_usec = int(round(lat['total_max']))
217 latencies[port].min_usec = int(round(lat['total_min']))
218 latencies[port].avg_usec = int(round(lat['average']))
222 def __combine_latencies(self, in_stats, results, port_handle):
223 """Traverse TRex result dictionary and combines chosen latency stats."""
226 total_min = float("inf")
227 for chain_id in range(self.chain_count):
229 _, lat_pg_id = self.get_pg_id(port_handle, chain_id)
230 lat = in_stats['latency'][lat_pg_id]['latency']
231 # dropped_pkts += lat['err_cntrs']['dropped']
232 total_max = max(lat['total_max'], total_max)
233 total_min = min(lat['total_min'], total_min)
234 average += lat['average']
237 if total_min == float("inf"):
239 results['min_delay_usec'] = total_min
240 results['max_delay_usec'] = total_max
241 results['avg_delay_usec'] = int(average / self.chain_count)
243 def _create_pkt(self, stream_cfg, l2frame_size):
244 pkt_base = Ether(src=stream_cfg['mac_src'], dst=stream_cfg['mac_dst'])
245 if stream_cfg['vlan_tag'] is not None:
246 # 50 = 14 (Ethernet II) + 4 (Vlan tag) + 4 (CRC Checksum) + 20 (IPv4) + 8 (UDP)
247 pkt_base /= Dot1Q(vlan=stream_cfg['vlan_tag'])
248 l2payload_size = int(l2frame_size) - 50
250 # 46 = 14 (Ethernet II) + 4 (CRC Checksum) + 20 (IPv4) + 8 (UDP)
251 l2payload_size = int(l2frame_size) - 46
252 payload = 'x' * l2payload_size
254 if stream_cfg['udp_src_port']:
255 udp_args['sport'] = int(stream_cfg['udp_src_port'])
256 if stream_cfg['udp_dst_port']:
257 udp_args['dport'] = int(stream_cfg['udp_dst_port'])
258 pkt_base /= IP() / UDP(**udp_args)
260 if stream_cfg['ip_addrs_step'] == 'random':
261 src_fv = STLVmFlowVarRepetableRandom(
263 min_value=stream_cfg['ip_src_addr'],
264 max_value=stream_cfg['ip_src_addr_max'],
266 seed=random.randint(0, 32767),
267 limit=stream_cfg['ip_src_count'])
268 dst_fv = STLVmFlowVarRepetableRandom(
270 min_value=stream_cfg['ip_dst_addr'],
271 max_value=stream_cfg['ip_dst_addr_max'],
273 seed=random.randint(0, 32767),
274 limit=stream_cfg['ip_dst_count'])
276 src_fv = STLVmFlowVar(
278 min_value=stream_cfg['ip_src_addr'],
279 max_value=stream_cfg['ip_src_addr'],
282 step=stream_cfg['ip_addrs_step'])
283 dst_fv = STLVmFlowVar(
285 min_value=stream_cfg['ip_dst_addr'],
286 max_value=stream_cfg['ip_dst_addr_max'],
289 step=stream_cfg['ip_addrs_step'])
293 STLVmWrFlowVar(fv_name="ip_src", pkt_offset="IP.src"),
295 STLVmWrFlowVar(fv_name="ip_dst", pkt_offset="IP.dst"),
296 STLVmFixChecksumHw(l3_offset="IP",
298 l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP)
301 return STLPktBuilder(pkt=pkt_base / payload, vm=STLScVmRaw(vm_param))
303 def generate_streams(self, port, chain_id, stream_cfg, l2frame, latency=True):
304 """Create a list of streams corresponding to a given chain and stream config.
306 port: port where the streams originate (0 or 1)
307 chain_id: the chain to which the streams are associated to
308 stream_cfg: stream configuration
309 l2frame: L2 frame size
310 latency: if True also create a latency stream
313 pg_id, lat_pg_id = self.get_pg_id(port, chain_id)
314 if l2frame == 'IMIX':
315 min_size = 64 if stream_cfg['vlan_tag'] is None else 68
316 self.adjust_imix_min_size(min_size)
317 for ratio, l2_frame_size in zip(self.imix_ratios, self.imix_l2_sizes):
318 pkt = self._create_pkt(stream_cfg, l2_frame_size)
319 streams.append(STLStream(packet=pkt,
320 flow_stats=STLFlowStats(pg_id=pg_id),
321 mode=STLTXCont(pps=ratio)))
324 # for IMIX, the latency packets have the average IMIX packet size
325 pkt = self._create_pkt(stream_cfg, self.imix_avg_l2_size)
328 pkt = self._create_pkt(stream_cfg, l2frame)
329 streams.append(STLStream(packet=pkt,
330 flow_stats=STLFlowStats(pg_id=pg_id),
334 streams.append(STLStream(packet=pkt,
335 flow_stats=STLFlowLatencyStats(pg_id=lat_pg_id),
336 mode=STLTXCont(pps=self.LATENCY_PPS)))
340 def __connect(self, client):
343 def __connect_after_start(self):
344 # after start, Trex may take a bit of time to initialize
345 # so we need to retry a few times
346 for it in xrange(self.config.generic_retry_count):
349 self.client.connect()
351 except Exception as ex:
352 if it == (self.config.generic_retry_count - 1):
354 LOG.info("Retrying connection to TRex (%s)...", ex.message)
357 """Connect to the TRex server."""
358 server_ip = self.generator_config.ip
359 LOG.info("Connecting to TRex (%s)...", server_ip)
361 # Connect to TRex server
362 self.client = STLClient(server=server_ip)
364 self.__connect(self.client)
365 except (TimeoutError, STLError) as e:
366 if server_ip == '127.0.0.1':
368 self.__start_server()
369 self.__connect_after_start()
370 except (TimeoutError, STLError) as e:
371 LOG.error('Cannot connect to TRex')
372 LOG.error(traceback.format_exc())
373 logpath = '/tmp/trex.log'
374 if os.path.isfile(logpath):
375 # Wait for TRex to finish writing error message
377 for _ in xrange(self.config.generic_retry_count):
378 size = os.path.getsize(logpath)
379 if size == last_size:
380 # probably not writing anymore
384 with open(logpath, 'r') as f:
388 raise TrafficGeneratorException(message)
390 raise TrafficGeneratorException(e.message)
392 ports = list(self.generator_config.ports)
393 self.port_handle = ports
395 self.client.reset(ports)
396 # Read HW information from each port
397 # this returns an array of dict (1 per port)
399 Example of output for Intel XL710
400 [{'arp': '-', 'src_ipv4': '-', u'supp_speeds': [40000], u'is_link_supported': True,
401 'grat_arp': 'off', 'speed': 40, u'index': 0, 'link_change_supported': 'yes',
402 u'rx': {u'counters': 127, u'caps': [u'flow_stats', u'latency']},
403 u'is_virtual': 'no', 'prom': 'off', 'src_mac': u'3c:fd:fe:a8:24:48', 'status': 'IDLE',
404 u'description': u'Ethernet Controller XL710 for 40GbE QSFP+',
405 'dest': u'fa:16:3e:3c:63:04', u'is_fc_supported': False, 'vlan': '-',
406 u'driver': u'net_i40e', 'led_change_supported': 'yes', 'rx_filter_mode': 'hardware match',
407 'fc': 'none', 'link': 'UP', u'hw_mac': u'3c:fd:fe:a8:24:48', u'pci_addr': u'0000:5e:00.0',
408 'mult': 'off', 'fc_supported': 'no', u'is_led_supported': True, 'rx_queue': 'off',
409 'layer_mode': 'Ethernet', u'numa': 0}, ...]
411 self.port_info = self.client.get_port_info(ports)
412 LOG.info('Connected to TRex')
413 for id, port in enumerate(self.port_info):
414 LOG.info(' Port %d: %s speed=%dGbps mac=%s pci=%s driver=%s',
415 id, port['description'], port['speed'], port['src_mac'],
416 port['pci_addr'], port['driver'])
417 # Make sure the 2 ports have the same speed
418 if self.port_info[0]['speed'] != self.port_info[1]['speed']:
419 raise TrafficGeneratorException('Traffic generator ports speed mismatch: %d/%d Gbps' %
420 (self.port_info[0]['speed'],
421 self.port_info[1]['speed']))
424 if self.config.service_chain == ChainType.EXT and not self.config.no_arp:
429 def __set_l3_mode(self):
430 self.client.set_service_mode(ports=self.port_handle, enabled=True)
431 for port, device in zip(self.port_handle, self.generator_config.devices):
433 self.client.set_l3_mode(port=port,
434 src_ipv4=device.tg_gateway_ip,
435 dst_ipv4=device.dst.gateway_ip,
436 vlan=device.vlan_tag if device.vlan_tagging else None)
438 # TRex tries to resolve ARP already, doesn't have to be successful yet
440 self.client.set_service_mode(ports=self.port_handle, enabled=False)
442 def __set_l2_mode(self):
443 self.client.set_service_mode(ports=self.port_handle, enabled=True)
444 for port, device in zip(self.port_handle, self.generator_config.devices):
445 for cfg in device.get_stream_configs():
446 self.client.set_l2_mode(port=port, dst_mac=cfg['mac_dst'])
447 self.client.set_service_mode(ports=self.port_handle, enabled=False)
449 def __start_server(self):
450 server = TRexTrafficServer()
451 server.run_server(self.generator_config)
453 def resolve_arp(self):
454 """Resolve all configured remote IP addresses.
456 return: True if ARP resolved successfully
458 self.client.set_service_mode(ports=self.port_handle)
459 LOG.info('Polling ARP until successful...')
461 for port, device in zip(self.port_handle, self.generator_config.devices):
462 # there should be 1 stream config per chain
463 stream_configs = device.get_stream_configs()
464 chain_count = len(stream_configs)
465 ctx = self.client.create_service_ctx(port=port)
466 # all dest macs on this port indexed by chain ID
467 dst_macs = [None] * chain_count
469 # the index in the list is the chain id
472 src_ip=cfg['ip_src_tg_gw'],
473 dst_ip=cfg['mac_discovery_gw'],
474 vlan=device.vlan_tag if device.vlan_tagging else None)
475 for cfg in stream_configs()
478 for attempt in range(self.config.generic_retry_count):
482 LOG.error(traceback.format_exc())
486 for chain_id, mac in enumerate(dst_macs):
488 arp_record = arps[chain_id].get_record()
489 if arp_record.dest_mac:
490 dst_macs[chain_id] = arp_record.dst_mac
492 LOG.info(' ARP: port=%d chain=%d IP=%s -> MAC=%s',
494 arp_record.dst_ip, arp_record.dst_mac)
496 unresolved.append(arp_record.dst_ip)
497 if dst_macs_count == chain_count:
498 arps[port] = dst_macs
499 LOG.info('ARP resolved successfully for port %s', port)
503 LOG.info('Retrying ARP for: %s (retry %d/%d)',
504 unresolved, retry, self.config.generic_retry_count)
505 if retry < self.config.generic_retry_count:
506 time.sleep(self.config.generic_poll_sec)
508 LOG.error('ARP timed out for port %s (resolved %d out of %d)',
514 self.client.set_service_mode(ports=self.port_handle, enabled=False)
515 if len(arps) == len(self.port_handle):
520 def __is_rate_enough(self, l2frame_size, rates, bidirectional, latency):
521 """Check if rate provided by user is above requirements. Applies only if latency is True."""
522 intf_speed = self.generator_config.intf_speed
528 r = utils.convert_rates(l2frame_size, rate, intf_speed)
529 total_rate += int(r['rate_pps'])
532 total_rate = utils.convert_rates(l2frame_size, rates[0], intf_speed)
533 # rate must be enough for latency stream and at least 1 pps for base stream per chain
534 required_rate = (self.LATENCY_PPS + 1) * self.config.service_chain_count * mult
535 result = utils.convert_rates(l2frame_size,
536 {'rate_pps': required_rate},
538 result['result'] = total_rate >= required_rate
541 return {'result': True}
543 def create_traffic(self, l2frame_size, rates, bidirectional, latency=True):
544 """Program all the streams in Trex server.
546 l2frame_size: L2 frame size or IMIX
547 rates: a list of 2 rates to run each direction
548 each rate is a dict like {'rate_pps': '10kpps'}
549 bidirectional: True if bidirectional
550 latency: True if latency measurement is needed
552 r = self.__is_rate_enough(l2frame_size, rates, bidirectional, latency)
554 raise TrafficGeneratorException(
555 'Required rate in total is at least one of: \n{pps}pps \n{bps}bps \n{load}%.'
556 .format(pps=r['rate_pps'],
558 load=r['rate_percent']))
559 # a dict of list of streams indexed by port#
560 # in case of fixed size, has self.chain_count * 2 * 2 streams
561 # (1 normal + 1 latency stream per direction per chain)
562 # for IMIX, has self.chain_count * 2 * 4 streams
563 # (3 normal + 1 latency stream per direction per chain)
565 for port in self.port_handle:
566 streamblock[port] = []
567 stream_cfgs = [d.get_stream_configs() for d in self.generator_config.devices]
568 self.rates = [utils.to_rate_str(rate) for rate in rates]
569 for chain_id, (fwd_stream_cfg, rev_stream_cfg) in enumerate(zip(*stream_cfgs)):
571 # in case of external chain with ARP, fill in the proper dest MAC
572 # based on the 2 ARP replies for each chain
573 fwd_stream_cfg['mac_dst'] = self.arps[self.port_handle[0]][chain_id]
574 rev_stream_cfg['mac_dst'] = self.arps[self.port_handle[1]][chain_id]
576 streamblock[0].extend(self.generate_streams(self.port_handle[0],
581 if len(self.rates) > 1:
582 streamblock[1].extend(self.generate_streams(self.port_handle[1],
586 latency=bidirectional and latency))
588 for port in self.port_handle:
589 self.client.add_streams(streamblock[port], ports=port)
590 LOG.info('Created %d traffic streams for port %s.', len(streamblock[port]), port)
592 def clear_streamblock(self):
593 """Clear all streams from TRex."""
595 self.client.reset(self.port_handle)
596 LOG.info('Cleared all existing streams')
599 """Get stats from Trex."""
600 stats = self.client.get_stats()
601 return self.extract_stats(stats)
604 """Return the Trex local port MAC addresses.
606 return: a list of MAC addresses indexed by the port#
608 return [port['src_mac'] for port in self.port_info]
610 def get_port_speed_gbps(self):
611 """Return the Trex local port MAC addresses.
613 return: a list of speed in Gbps indexed by the port#
615 return [port['speed'] for port in self.port_info]
617 def get_dest_macs(self):
618 """Return the dest MAC for all chains for both ports for the current traffic setup.
620 return: a list of MAC addresses indexed by the port# [[m00, m01...], [m10, m11...]]
622 If ARP are used, resolve_arp() must be called prior to calling this method.
624 # if ARP was used, return the dest MACs resolved by ARP
626 return [self.arps[port] for port in self.port_handle]
627 # no ARP, use the dest MACs as configured in the devices
628 return [d.dest_macs for d in self.generator_config.devices]
630 def clear_stats(self):
631 """Clear all stats in the traffic gneerator."""
633 self.client.clear_stats()
635 def start_traffic(self):
636 """Start generating traffic in all ports."""
637 for port, rate in zip(self.port_handle, self.rates):
638 self.client.start(ports=port, mult=rate, duration=self.config.duration_sec, force=True)
640 def stop_traffic(self):
641 """Stop generating traffic."""
642 self.client.stop(ports=self.port_handle)
644 def start_capture(self):
645 """Capture all packets on both ports that are unicast to us."""
648 # Need to filter out unwanted packets so we do not end up counting
649 # src MACs of frames that are not unicast to us
650 src_mac_list = self.get_macs()
651 bpf_filter = "ether dst %s or ether dst %s" % (src_mac_list[0], src_mac_list[1])
652 # ports must be set in service in order to enable capture
653 self.client.set_service_mode(ports=self.port_handle)
654 self.capture_id = self.client.start_capture(rx_ports=self.port_handle,
655 bpf_filter=bpf_filter)
657 def fetch_capture_packets(self):
658 """Fetch capture packets in capture mode."""
660 self.packet_list = []
661 self.client.fetch_capture_packets(capture_id=self.capture_id['id'],
662 output=self.packet_list)
664 def stop_capture(self):
665 """Stop capturing packets."""
667 self.client.stop_capture(capture_id=self.capture_id['id'])
668 self.capture_id = None
669 self.client.set_service_mode(ports=self.port_handle, enabled=False)
672 """Cleanup Trex driver."""
675 self.client.reset(self.port_handle)
676 self.client.disconnect()
678 # TRex does not like a reset while in disconnected state