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
14 """Driver module for TRex traffic generator."""
22 from itertools import count
23 from nfvbench.log import LOG
24 from nfvbench.traffic_server import TRexTrafficServer
25 from nfvbench.utils import cast_integer
26 from nfvbench.utils import timeout
27 from nfvbench.utils import TimeoutError
28 from traffic_base import AbstractTrafficGenerator
29 from traffic_base import TrafficGeneratorException
30 import traffic_utils as utils
31 from traffic_utils import IMIX_AVG_L2_FRAME_SIZE
32 from traffic_utils import IMIX_L2_SIZES
33 from traffic_utils import IMIX_RATIOS
35 # pylint: disable=import-error
36 from trex_stl_lib.api import bind_layers
37 from trex_stl_lib.api import CTRexVmInsFixHwCs
38 from trex_stl_lib.api import Dot1Q
39 from trex_stl_lib.api import Ether
40 from trex_stl_lib.api import FlagsField
41 from trex_stl_lib.api import IP
42 from trex_stl_lib.api import Packet
43 from trex_stl_lib.api import STLClient
44 from trex_stl_lib.api import STLError
45 from trex_stl_lib.api import STLFlowLatencyStats
46 from trex_stl_lib.api import STLFlowStats
47 from trex_stl_lib.api import STLPktBuilder
48 from trex_stl_lib.api import STLScVmRaw
49 from trex_stl_lib.api import STLStream
50 from trex_stl_lib.api import STLTXCont
51 from trex_stl_lib.api import STLVmFixChecksumHw
52 from trex_stl_lib.api import STLVmFlowVar
53 from trex_stl_lib.api import STLVmFlowVarRepetableRandom
54 from trex_stl_lib.api import STLVmWrFlowVar
55 from trex_stl_lib.api import ThreeBytesField
56 from trex_stl_lib.api import UDP
57 from trex_stl_lib.api import XByteField
58 from trex_stl_lib.services.trex_stl_service_arp import STLServiceARP
61 # pylint: enable=import-error
66 _VXLAN_FLAGS = ['R' * 27] + ['I'] + ['R' * 5]
68 fields_desc = [FlagsField("flags", 0x08000000, 32, _VXLAN_FLAGS),
69 ThreeBytesField("vni", 0),
70 XByteField("reserved", 0x00)]
74 return self.sprintf("VXLAN (vni=%VXLAN.vni%)")
76 class TRex(AbstractTrafficGenerator):
77 """TRex traffic generator driver."""
80 CHAIN_PG_ID_MASK = 0x007F
81 PORT_PG_ID_MASK = 0x0080
82 LATENCY_PG_ID_MASK = 0x0100
84 def __init__(self, traffic_client):
86 AbstractTrafficGenerator.__init__(self, traffic_client)
90 self.chain_count = self.generator_config.service_chain_count
92 self.capture_id = None
95 def get_version(self):
96 """Get the Trex version."""
97 return self.client.get_server_version() if self.client else ''
99 def get_pg_id(self, port, chain_id):
100 """Calculate the packet group IDs to use for a given port/stream type/chain_id.
103 chain_id: identifies to which chain the pg_id is associated (0 to 255)
104 return: pg_id, lat_pg_id
106 We use a bit mask to set up the 3 fields:
107 0x007F: chain ID (8 bits for a max of 128 chains)
111 pg_id = port * TRex.PORT_PG_ID_MASK | chain_id
112 return pg_id, pg_id | TRex.LATENCY_PG_ID_MASK
114 def extract_stats(self, in_stats):
115 """Extract stats from dict returned by Trex API.
117 :param in_stats: dict as returned by TRex api
119 utils.nan_replace(in_stats)
120 # LOG.debug(in_stats)
123 # port_handles should have only 2 elements: [0, 1]
124 # so (1 - ph) will be the index for the far end port
125 for ph in self.port_handle:
127 far_end_stats = in_stats[1 - ph]
130 'total_pkts': cast_integer(stats['opackets']),
131 'total_pkt_bytes': cast_integer(stats['obytes']),
132 'pkt_rate': cast_integer(stats['tx_pps']),
133 'pkt_bit_rate': cast_integer(stats['tx_bps'])
136 'total_pkts': cast_integer(stats['ipackets']),
137 'total_pkt_bytes': cast_integer(stats['ibytes']),
138 'pkt_rate': cast_integer(stats['rx_pps']),
139 'pkt_bit_rate': cast_integer(stats['rx_bps']),
140 # how many pkts were dropped in RX direction
141 # need to take the tx counter on the far end port
142 'dropped_pkts': cast_integer(
143 far_end_stats['opackets'] - stats['ipackets'])
146 self.__combine_latencies(in_stats, result[ph]['rx'], ph)
148 total_tx_pkts = result[0]['tx']['total_pkts'] + result[1]['tx']['total_pkts']
149 result["total_tx_rate"] = cast_integer(total_tx_pkts / self.config.duration_sec)
150 result["flow_stats"] = in_stats["flow_stats"]
151 result["latency"] = in_stats["latency"]
154 def get_stream_stats(self, trex_stats, if_stats, latencies, chain_idx):
155 """Extract the aggregated stats for a given chain.
157 trex_stats: stats as returned by get_stats()
158 if_stats: a list of 2 interface stats to update (port 0 and 1)
159 latencies: a list of 2 Latency instances to update for this chain (port 0 and 1)
160 latencies[p] is the latency for packets sent on port p
161 if there are no latency streams, the Latency instances are not modified
162 chain_idx: chain index of the interface stats
164 The packet counts include normal and latency streams.
166 Trex returns flows stats as follows:
168 'flow_stats': {0: {'rx_bps': {0: 0, 1: 0, 'total': 0},
169 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
170 'rx_bytes': {0: nan, 1: nan, 'total': nan},
171 'rx_pkts': {0: 0, 1: 15001, 'total': 15001},
172 'rx_pps': {0: 0, 1: 0, 'total': 0},
173 'tx_bps': {0: 0, 1: 0, 'total': 0},
174 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
175 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068},
176 'tx_pkts': {0: 15001, 1: 0, 'total': 15001},
177 'tx_pps': {0: 0, 1: 0, 'total': 0}},
178 1: {'rx_bps': {0: 0, 1: 0, 'total': 0},
179 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
180 'rx_bytes': {0: nan, 1: nan, 'total': nan},
181 'rx_pkts': {0: 0, 1: 15001, 'total': 15001},
182 'rx_pps': {0: 0, 1: 0, 'total': 0},
183 'tx_bps': {0: 0, 1: 0, 'total': 0},
184 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
185 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068},
186 'tx_pkts': {0: 15001, 1: 0, 'total': 15001},
187 'tx_pps': {0: 0, 1: 0, 'total': 0}},
188 128: {'rx_bps': {0: 0, 1: 0, 'total': 0},
189 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
190 'rx_bytes': {0: nan, 1: nan, 'total': nan},
191 'rx_pkts': {0: 15001, 1: 0, 'total': 15001},
192 'rx_pps': {0: 0, 1: 0, 'total': 0},
193 'tx_bps': {0: 0, 1: 0, 'total': 0},
194 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0},
195 'tx_bytes': {0: 0, 1: 1020068, 'total': 1020068},
196 'tx_pkts': {0: 0, 1: 15001, 'total': 15001},
197 'tx_pps': {0: 0, 1: 0, 'total': 0}},etc...
199 the pg_id (0, 1, 128,...) is the key of the dict and is obtained using the
201 packet counters for a given stream sent on port p are reported as:
202 - tx_pkts[p] on port p
203 - rx_pkts[1-p] on the far end port
205 This is a tricky/critical counter transposition operation because
206 the results are grouped by port (not by stream):
207 tx_pkts_port(p=0) comes from pg_id(port=0, chain_idx)['tx_pkts'][0]
208 rx_pkts_port(p=0) comes from pg_id(port=1, chain_idx)['rx_pkts'][0]
209 tx_pkts_port(p=1) comes from pg_id(port=1, chain_idx)['tx_pkts'][1]
210 rx_pkts_port(p=1) comes from pg_id(port=0, chain_idx)['rx_pkts'][1]
212 or using a more generic formula:
213 tx_pkts_port(p) comes from pg_id(port=p, chain_idx)['tx_pkts'][p]
214 rx_pkts_port(p) comes from pg_id(port=1-p, chain_idx)['rx_pkts'][p]
216 the second formula is equivalent to
217 rx_pkts_port(1-p) comes from pg_id(port=p, chain_idx)['rx_pkts'][1-p]
219 If there are latency streams, those same counters need to be added in the same way
221 def get_latency(lval):
223 return int(round(lval))
229 for port in range(2):
230 pg_id, lat_pg_id = self.get_pg_id(port, chain_idx)
231 for pid in [pg_id, lat_pg_id]:
233 pg_stats = trex_stats['flow_stats'][pid]
234 if_stats[port].tx += pg_stats['tx_pkts'][port]
235 if_stats[1 - port].rx += pg_stats['rx_pkts'][1 - port]
239 lat = trex_stats['latency'][lat_pg_id]['latency']
240 # dropped_pkts += lat['err_cntrs']['dropped']
241 latencies[port].max_usec = get_latency(lat['total_max'])
242 if math.isnan(lat['total_min']):
243 latencies[port].min_usec = 0
244 latencies[port].avg_usec = 0
246 latencies[port].min_usec = get_latency(lat['total_min'])
247 latencies[port].avg_usec = get_latency(lat['average'])
251 def __combine_latencies(self, in_stats, results, port_handle):
252 """Traverse TRex result dictionary and combines chosen latency stats."""
255 total_min = float("inf")
256 for chain_id in range(self.chain_count):
258 _, lat_pg_id = self.get_pg_id(port_handle, chain_id)
259 lat = in_stats['latency'][lat_pg_id]['latency']
260 # dropped_pkts += lat['err_cntrs']['dropped']
261 total_max = max(lat['total_max'], total_max)
262 total_min = min(lat['total_min'], total_min)
263 average += lat['average']
266 if total_min == float("inf"):
268 results['min_delay_usec'] = total_min
269 results['max_delay_usec'] = total_max
270 results['avg_delay_usec'] = int(average / self.chain_count)
272 def _bind_vxlan(self):
273 bind_layers(UDP, VXLAN, dport=4789)
274 bind_layers(VXLAN, Ether)
276 def _create_pkt(self, stream_cfg, l2frame_size):
277 """Create a packet of given size.
279 l2frame_size: size of the L2 frame in bytes (including the 32-bit FCS)
281 # Trex will add the FCS field, so we need to remove 4 bytes from the l2 frame size
282 frame_size = int(l2frame_size) - 4
284 if stream_cfg['vxlan'] is True:
287 pkt_base = Ether(src=stream_cfg['vtep_src_mac'], dst=stream_cfg['vtep_dst_mac'])
288 if stream_cfg['vtep_vlan'] is not None:
289 pkt_base /= Dot1Q(vlan=stream_cfg['vtep_vlan'])
290 pkt_base /= IP(src=stream_cfg['vtep_src_ip'], dst=stream_cfg['vtep_dst_ip'])
291 pkt_base /= UDP(sport=random.randint(1337, 32767), dport=4789)
292 pkt_base /= VXLAN(vni=stream_cfg['net_vni'])
293 pkt_base /= Ether(src=stream_cfg['mac_src'], dst=stream_cfg['mac_dst'])
296 pkt_base = Ether(src=stream_cfg['mac_src'], dst=stream_cfg['mac_dst'])
298 if stream_cfg['vlan_tag'] is not None:
299 pkt_base /= Dot1Q(vlan=stream_cfg['vlan_tag'])
302 if stream_cfg['udp_src_port']:
303 udp_args['sport'] = int(stream_cfg['udp_src_port'])
304 if stream_cfg['udp_dst_port']:
305 udp_args['dport'] = int(stream_cfg['udp_dst_port'])
306 pkt_base /= IP() / UDP(**udp_args)
308 if stream_cfg['ip_addrs_step'] == 'random':
309 src_fv = STLVmFlowVarRepetableRandom(
311 min_value=stream_cfg['ip_src_addr'],
312 max_value=stream_cfg['ip_src_addr_max'],
314 seed=random.randint(0, 32767),
315 limit=stream_cfg['ip_src_count'])
316 dst_fv = STLVmFlowVarRepetableRandom(
318 min_value=stream_cfg['ip_dst_addr'],
319 max_value=stream_cfg['ip_dst_addr_max'],
321 seed=random.randint(0, 32767),
322 limit=stream_cfg['ip_dst_count'])
324 src_fv = STLVmFlowVar(
326 min_value=stream_cfg['ip_src_addr'],
327 max_value=stream_cfg['ip_src_addr'],
330 step=stream_cfg['ip_addrs_step'])
331 dst_fv = STLVmFlowVar(
333 min_value=stream_cfg['ip_dst_addr'],
334 max_value=stream_cfg['ip_dst_addr_max'],
337 step=stream_cfg['ip_addrs_step'])
341 STLVmWrFlowVar(fv_name="ip_src", pkt_offset="IP:{}.src".format(encap_level)),
343 STLVmWrFlowVar(fv_name="ip_dst", pkt_offset="IP:{}.dst".format(encap_level)),
344 STLVmFixChecksumHw(l3_offset="IP:{}".format(encap_level),
345 l4_offset="UDP:{}".format(encap_level),
346 l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP)
348 pad = max(0, frame_size - len(pkt_base)) * 'x'
350 return STLPktBuilder(pkt=pkt_base / pad, vm=STLScVmRaw(vm_param))
352 def generate_streams(self, port, chain_id, stream_cfg, l2frame, latency=True):
353 """Create a list of streams corresponding to a given chain and stream config.
355 port: port where the streams originate (0 or 1)
356 chain_id: the chain to which the streams are associated to
357 stream_cfg: stream configuration
358 l2frame: L2 frame size (including 4-byte FCS) or 'IMIX'
359 latency: if True also create a latency stream
362 pg_id, lat_pg_id = self.get_pg_id(port, chain_id)
363 if l2frame == 'IMIX':
364 for ratio, l2_frame_size in zip(IMIX_RATIOS, IMIX_L2_SIZES):
365 pkt = self._create_pkt(stream_cfg, l2_frame_size)
366 streams.append(STLStream(packet=pkt,
367 flow_stats=STLFlowStats(pg_id=pg_id),
368 mode=STLTXCont(pps=ratio)))
371 # for IMIX, the latency packets have the average IMIX packet size
372 pkt = self._create_pkt(stream_cfg, IMIX_AVG_L2_FRAME_SIZE)
375 l2frame_size = int(l2frame)
376 pkt = self._create_pkt(stream_cfg, l2frame_size)
377 streams.append(STLStream(packet=pkt,
378 flow_stats=STLFlowStats(pg_id=pg_id),
380 # for the latency stream, the minimum payload is 16 bytes even in case of vlan tagging
381 # without vlan, the min l2 frame size is 64
383 # This only applies to the latency stream
384 if latency and stream_cfg['vlan_tag'] and l2frame_size < 68:
385 pkt = self._create_pkt(stream_cfg, 68)
388 streams.append(STLStream(packet=pkt,
389 flow_stats=STLFlowLatencyStats(pg_id=lat_pg_id),
390 mode=STLTXCont(pps=self.LATENCY_PPS)))
394 def __connect(self, client):
397 def __connect_after_start(self):
398 # after start, Trex may take a bit of time to initialize
399 # so we need to retry a few times
400 for it in xrange(self.config.generic_retry_count):
403 self.client.connect()
405 except Exception as ex:
406 if it == (self.config.generic_retry_count - 1):
408 LOG.info("Retrying connection to TRex (%s)...", ex.message)
411 """Connect to the TRex server."""
412 server_ip = self.generator_config.ip
413 LOG.info("Connecting to TRex (%s)...", server_ip)
415 # Connect to TRex server
416 self.client = STLClient(server=server_ip)
418 self.__connect(self.client)
419 except (TimeoutError, STLError) as e:
420 if server_ip == '127.0.0.1':
422 self.__start_server()
423 self.__connect_after_start()
424 except (TimeoutError, STLError) as e:
425 LOG.error('Cannot connect to TRex')
426 LOG.error(traceback.format_exc())
427 logpath = '/tmp/trex.log'
428 if os.path.isfile(logpath):
429 # Wait for TRex to finish writing error message
431 for _ in xrange(self.config.generic_retry_count):
432 size = os.path.getsize(logpath)
433 if size == last_size:
434 # probably not writing anymore
438 with open(logpath, 'r') as f:
442 raise TrafficGeneratorException(message)
444 raise TrafficGeneratorException(e.message)
446 ports = list(self.generator_config.ports)
447 self.port_handle = ports
449 self.client.reset(ports)
450 # Read HW information from each port
451 # this returns an array of dict (1 per port)
453 Example of output for Intel XL710
454 [{'arp': '-', 'src_ipv4': '-', u'supp_speeds': [40000], u'is_link_supported': True,
455 'grat_arp': 'off', 'speed': 40, u'index': 0, 'link_change_supported': 'yes',
456 u'rx': {u'counters': 127, u'caps': [u'flow_stats', u'latency']},
457 u'is_virtual': 'no', 'prom': 'off', 'src_mac': u'3c:fd:fe:a8:24:48', 'status': 'IDLE',
458 u'description': u'Ethernet Controller XL710 for 40GbE QSFP+',
459 'dest': u'fa:16:3e:3c:63:04', u'is_fc_supported': False, 'vlan': '-',
460 u'driver': u'net_i40e', 'led_change_supported': 'yes', 'rx_filter_mode': 'hardware match',
461 'fc': 'none', 'link': 'UP', u'hw_mac': u'3c:fd:fe:a8:24:48', u'pci_addr': u'0000:5e:00.0',
462 'mult': 'off', 'fc_supported': 'no', u'is_led_supported': True, 'rx_queue': 'off',
463 'layer_mode': 'Ethernet', u'numa': 0}, ...]
465 self.port_info = self.client.get_port_info(ports)
466 LOG.info('Connected to TRex')
467 for id, port in enumerate(self.port_info):
468 LOG.info(' Port %d: %s speed=%dGbps mac=%s pci=%s driver=%s',
469 id, port['description'], port['speed'], port['src_mac'],
470 port['pci_addr'], port['driver'])
471 # Make sure the 2 ports have the same speed
472 if self.port_info[0]['speed'] != self.port_info[1]['speed']:
473 raise TrafficGeneratorException('Traffic generator ports speed mismatch: %d/%d Gbps' %
474 (self.port_info[0]['speed'],
475 self.port_info[1]['speed']))
477 def __start_server(self):
478 server = TRexTrafficServer()
479 server.run_server(self.generator_config)
481 def resolve_arp(self):
482 """Resolve all configured remote IP addresses.
484 return: None if ARP failed to resolve for all IP addresses
485 else a dict of list of dest macs indexed by port#
486 the dest macs in the list are indexed by the chain id
488 self.client.set_service_mode(ports=self.port_handle)
489 LOG.info('Polling ARP until successful...')
491 for port, device in zip(self.port_handle, self.generator_config.devices):
492 # there should be 1 stream config per chain
493 stream_configs = device.get_stream_configs()
494 chain_count = len(stream_configs)
495 ctx = self.client.create_service_ctx(port=port)
496 # all dest macs on this port indexed by chain ID
497 dst_macs = [None] * chain_count
499 # the index in the list is the chain id
500 if self.config.vxlan:
503 src_ip=device.vtep_src_ip,
504 dst_ip=device.vtep_dst_ip,
505 vlan=device.vtep_vlan)
506 for cfg in stream_configs
511 src_ip=cfg['ip_src_tg_gw'],
512 dst_ip=cfg['mac_discovery_gw'],
513 # will be None if no vlan tagging
514 vlan=cfg['vlan_tag'])
515 for cfg in stream_configs
518 for attempt in range(self.config.generic_retry_count):
522 LOG.error(traceback.format_exc())
526 for chain_id, mac in enumerate(dst_macs):
528 arp_record = arps[chain_id].get_record()
529 if arp_record.dst_mac:
530 dst_macs[chain_id] = arp_record.dst_mac
532 LOG.info(' ARP: port=%d chain=%d src IP=%s dst IP=%s -> MAC=%s',
535 arp_record.dst_ip, arp_record.dst_mac)
537 unresolved.append(arp_record.dst_ip)
538 if dst_macs_count == chain_count:
539 arp_dest_macs[port] = dst_macs
540 LOG.info('ARP resolved successfully for port %s', port)
544 LOG.info('Retrying ARP for: %s (retry %d/%d)',
545 unresolved, retry, self.config.generic_retry_count)
546 if retry < self.config.generic_retry_count:
547 time.sleep(self.config.generic_poll_sec)
549 LOG.error('ARP timed out for port %s (resolved %d out of %d)',
555 self.client.set_service_mode(ports=self.port_handle, enabled=False)
556 if len(arp_dest_macs) == len(self.port_handle):
560 def __is_rate_enough(self, l2frame_size, rates, bidirectional, latency):
561 """Check if rate provided by user is above requirements. Applies only if latency is True."""
562 intf_speed = self.generator_config.intf_speed
568 r = utils.convert_rates(l2frame_size, rate, intf_speed)
569 total_rate += int(r['rate_pps'])
572 total_rate = utils.convert_rates(l2frame_size, rates[0], intf_speed)
573 # rate must be enough for latency stream and at least 1 pps for base stream per chain
574 required_rate = (self.LATENCY_PPS + 1) * self.config.service_chain_count * mult
575 result = utils.convert_rates(l2frame_size,
576 {'rate_pps': required_rate},
578 result['result'] = total_rate >= required_rate
581 return {'result': True}
583 def create_traffic(self, l2frame_size, rates, bidirectional, latency=True):
584 """Program all the streams in Trex server.
586 l2frame_size: L2 frame size or IMIX
587 rates: a list of 2 rates to run each direction
588 each rate is a dict like {'rate_pps': '10kpps'}
589 bidirectional: True if bidirectional
590 latency: True if latency measurement is needed
592 r = self.__is_rate_enough(l2frame_size, rates, bidirectional, latency)
594 raise TrafficGeneratorException(
595 'Required rate in total is at least one of: \n{pps}pps \n{bps}bps \n{load}%.'
596 .format(pps=r['rate_pps'],
598 load=r['rate_percent']))
599 # a dict of list of streams indexed by port#
600 # in case of fixed size, has self.chain_count * 2 * 2 streams
601 # (1 normal + 1 latency stream per direction per chain)
602 # for IMIX, has self.chain_count * 2 * 4 streams
603 # (3 normal + 1 latency stream per direction per chain)
605 for port in self.port_handle:
606 streamblock[port] = []
607 stream_cfgs = [d.get_stream_configs() for d in self.generator_config.devices]
608 self.rates = [utils.to_rate_str(rate) for rate in rates]
609 for chain_id, (fwd_stream_cfg, rev_stream_cfg) in enumerate(zip(*stream_cfgs)):
610 streamblock[0].extend(self.generate_streams(self.port_handle[0],
615 if len(self.rates) > 1:
616 streamblock[1].extend(self.generate_streams(self.port_handle[1],
620 latency=bidirectional and latency))
622 for port in self.port_handle:
623 self.client.add_streams(streamblock[port], ports=port)
624 LOG.info('Created %d traffic streams for port %s.', len(streamblock[port]), port)
626 def clear_streamblock(self):
627 """Clear all streams from TRex."""
629 self.client.reset(self.port_handle)
630 LOG.info('Cleared all existing streams')
633 """Get stats from Trex."""
634 stats = self.client.get_stats()
635 return self.extract_stats(stats)
638 """Return the Trex local port MAC addresses.
640 return: a list of MAC addresses indexed by the port#
642 return [port['src_mac'] for port in self.port_info]
644 def get_port_speed_gbps(self):
645 """Return the Trex local port MAC addresses.
647 return: a list of speed in Gbps indexed by the port#
649 return [port['speed'] for port in self.port_info]
651 def clear_stats(self):
652 """Clear all stats in the traffic gneerator."""
654 self.client.clear_stats()
656 def start_traffic(self):
657 """Start generating traffic in all ports."""
658 for port, rate in zip(self.port_handle, self.rates):
659 self.client.start(ports=port, mult=rate, duration=self.config.duration_sec, force=True)
661 def stop_traffic(self):
662 """Stop generating traffic."""
663 self.client.stop(ports=self.port_handle)
665 def start_capture(self):
666 """Capture all packets on both ports that are unicast to us."""
669 # Need to filter out unwanted packets so we do not end up counting
670 # src MACs of frames that are not unicast to us
671 src_mac_list = self.get_macs()
672 bpf_filter = "ether dst %s or ether dst %s" % (src_mac_list[0], src_mac_list[1])
673 # ports must be set in service in order to enable capture
674 self.client.set_service_mode(ports=self.port_handle)
675 self.capture_id = self.client.start_capture(rx_ports=self.port_handle,
676 bpf_filter=bpf_filter)
678 def fetch_capture_packets(self):
679 """Fetch capture packets in capture mode."""
681 self.packet_list = []
682 self.client.fetch_capture_packets(capture_id=self.capture_id['id'],
683 output=self.packet_list)
685 def stop_capture(self):
686 """Stop capturing packets."""
688 self.client.stop_capture(capture_id=self.capture_id['id'])
689 self.capture_id = None
690 self.client.set_service_mode(ports=self.port_handle, enabled=False)
693 """Cleanup Trex driver."""
696 self.client.reset(self.port_handle)
697 self.client.disconnect()
699 # TRex does not like a reset while in disconnected state