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
15 """Interface to the traffic generator clients including NDR/PDR binary search."""
17 from datetime import datetime
22 from attrdict import AttrDict
24 from netaddr import IPNetwork
25 # pylint: disable=import-error
26 from trex_stl_lib.api import STLError
27 # pylint: enable=import-error
30 from packet_stats import InterfaceStats
31 from packet_stats import PacketPathStats
32 from stats_collector import IntervalCollector
33 from stats_collector import IterationCollector
34 import traffic_gen.traffic_utils as utils
35 from utils import cast_integer
38 class TrafficClientException(Exception):
39 """Generic traffic client exception."""
44 class TrafficRunner(object):
45 """Serialize various steps required to run traffic."""
47 def __init__(self, client, duration_sec, interval_sec=0):
48 """Create a traffic runner."""
50 self.start_time = None
51 self.duration_sec = duration_sec
52 self.interval_sec = interval_sec
55 """Clear stats and instruct the traffic generator to start generating traffic."""
58 LOG.info('Running traffic generator')
59 self.client.gen.clear_stats()
60 self.client.gen.start_traffic()
61 self.start_time = time.time()
62 return self.poll_stats()
65 """Stop the current run and instruct the traffic generator to stop traffic."""
67 self.start_time = None
68 self.client.gen.stop_traffic()
71 """Check if a run is still pending."""
72 return self.start_time is not None
74 def time_elapsed(self):
75 """Return time elapsed since start of run."""
77 return time.time() - self.start_time
78 return self.duration_sec
81 """Poll latest stats from the traffic generator at fixed interval - sleeps if necessary.
83 return: latest stats or None if traffic is stopped
85 if not self.is_running():
87 if self.client.skip_sleep():
89 return self.client.get_stats()
90 time_elapsed = self.time_elapsed()
91 if time_elapsed > self.duration_sec:
94 time_left = self.duration_sec - time_elapsed
95 if self.interval_sec > 0.0:
96 if time_left <= self.interval_sec:
100 time.sleep(self.interval_sec)
102 time.sleep(self.duration_sec)
104 return self.client.get_stats()
107 class IpBlock(object):
108 """Manage a block of IP addresses."""
110 def __init__(self, base_ip, step_ip, count_ip):
111 """Create an IP block."""
112 self.base_ip_int = Device.ip_to_int(base_ip)
113 self.step = Device.ip_to_int(step_ip)
114 self.max_available = count_ip
117 def get_ip(self, index=0):
118 """Return the IP address at given index."""
119 if index < 0 or index >= self.max_available:
120 raise IndexError('Index out of bounds: %d (max=%d)' % (index, self.max_available))
121 return Device.int_to_ip(self.base_ip_int + index * self.step)
123 def reserve_ip_range(self, count):
124 """Reserve a range of count consecutive IP addresses spaced by step."""
125 if self.next_free + count > self.max_available:
126 raise IndexError('No more IP addresses next free=%d max_available=%d requested=%d' %
130 first_ip = self.get_ip(self.next_free)
131 last_ip = self.get_ip(self.next_free + count - 1)
132 self.next_free += count
133 return (first_ip, last_ip)
135 def reset_reservation(self):
136 """Reset all reservations and restart with a completely unused IP block."""
140 class Device(object):
141 """Represent a port device and all information associated to it.
143 In the curent version we only support 2 port devices for the traffic generator
144 identified as port 0 or port 1.
147 def __init__(self, port, generator_config):
148 """Create a new device for a given port."""
149 self.generator_config = generator_config
150 self.chain_count = generator_config.service_chain_count
151 self.flow_count = generator_config.flow_count / 2
153 self.switch_port = generator_config.interfaces[port].get('switch_port', None)
154 self.vtep_vlan = None
155 self.vtep_src_mac = None
157 self.pci = generator_config.interfaces[port].pci
159 self.dest_macs = None
160 self.vtep_dst_mac = None
161 self.vtep_dst_ip = None
162 if generator_config.vteps is None:
163 self.vtep_src_ip = None
165 self.vtep_src_ip = generator_config.vteps[port]
168 self.ip_addrs = generator_config.ip_addrs[port]
169 subnet = IPNetwork(self.ip_addrs)
170 self.ip = subnet.ip.format()
171 self.ip_addrs_step = generator_config.ip_addrs_step
172 self.ip_block = IpBlock(self.ip, self.ip_addrs_step, self.flow_count)
173 self.gw_ip_block = IpBlock(generator_config.gateway_ips[port],
174 generator_config.gateway_ip_addrs_step,
176 self.tg_gateway_ip_addrs = generator_config.tg_gateway_ip_addrs[port]
177 self.tg_gw_ip_block = IpBlock(self.tg_gateway_ip_addrs,
178 generator_config.tg_gateway_ip_addrs_step,
180 self.udp_src_port = generator_config.udp_src_port
181 self.udp_dst_port = generator_config.udp_dst_port
183 def set_mac(self, mac):
184 """Set the local MAC for this port device."""
186 raise TrafficClientException('Trying to set traffic generator MAC address as None')
189 def get_peer_device(self):
190 """Get the peer device (device 0 -> device 1, or device 1 -> device 0)."""
191 return self.generator_config.devices[1 - self.port]
193 def set_vtep_dst_mac(self, dest_macs):
194 """Set the list of dest MACs indexed by the chain id.
196 This is only called in 2 cases:
197 - VM macs discovered using openstack API
198 - dest MACs provisioned in config file
200 self.vtep_dst_mac = map(str, dest_macs)
202 def set_dest_macs(self, dest_macs):
203 """Set the list of dest MACs indexed by the chain id.
205 This is only called in 2 cases:
206 - VM macs discovered using openstack API
207 - dest MACs provisioned in config file
209 self.dest_macs = map(str, dest_macs)
211 def get_dest_macs(self):
212 """Get the list of dest macs for this device.
214 If set_dest_macs was never called, assumes l2-loopback and return
215 a list of peer mac (as many as chains but normally only 1 chain)
218 return self.dest_macs
219 # assume this is l2-loopback
220 return [self.get_peer_device().mac] * self.chain_count
222 def set_vlans(self, vlans):
223 """Set the list of vlans to use indexed by the chain id."""
225 LOG.info("Port %d: VLANs %s", self.port, self.vlans)
227 def set_vtep_vlan(self, vlan):
228 """Set the vtep vlan to use indexed by specific port."""
229 self.vtep_vlan = vlan
231 self.vlan_tagging = None
232 LOG.info("Port %d: VTEP VLANs %s", self.port, self.vtep_vlan)
234 def set_vxlan_endpoints(self, src_ip, dst_ip):
235 self.vtep_dst_ip = dst_ip
236 self.vtep_src_ip = src_ip
237 LOG.info("Port %d: src_vtep %s, dst_vtep %s", self.port,
238 self.vtep_src_ip, self.vtep_dst_ip)
240 def set_vxlans(self, vnis):
242 LOG.info("Port %d: VNIs %s", self.port, self.vnis)
244 def get_gw_ip(self, chain_index):
245 """Retrieve the IP address assigned for the gateway of a given chain."""
246 return self.gw_ip_block.get_ip(chain_index)
248 def get_stream_configs(self):
249 """Get the stream config for a given chain on this device.
251 Called by the traffic generator driver to program the traffic generator properly
252 before generating traffic
255 # exact flow count for each chain is calculated as follows:
256 # - all chains except the first will have the same flow count
257 # calculated as (total_flows + chain_count - 1) / chain_count
258 # - the first chain will have the remainder
259 # example 11 flows and 3 chains => 3, 4, 4
260 flows_per_chain = (self.flow_count + self.chain_count - 1) / self.chain_count
261 cur_chain_flow_count = self.flow_count - flows_per_chain * (self.chain_count - 1)
262 peer = self.get_peer_device()
263 self.ip_block.reset_reservation()
264 peer.ip_block.reset_reservation()
265 dest_macs = self.get_dest_macs()
267 for chain_idx in xrange(self.chain_count):
268 src_ip_first, src_ip_last = self.ip_block.reserve_ip_range(cur_chain_flow_count)
269 dst_ip_first, dst_ip_last = peer.ip_block.reserve_ip_range(cur_chain_flow_count)
272 'count': cur_chain_flow_count,
274 'mac_dst': dest_macs[chain_idx],
275 'ip_src_addr': src_ip_first,
276 'ip_src_addr_max': src_ip_last,
277 'ip_src_count': cur_chain_flow_count,
278 'ip_dst_addr': dst_ip_first,
279 'ip_dst_addr_max': dst_ip_last,
280 'ip_dst_count': cur_chain_flow_count,
281 'ip_addrs_step': self.ip_addrs_step,
282 'udp_src_port': self.udp_src_port,
283 'udp_dst_port': self.udp_dst_port,
284 'mac_discovery_gw': self.get_gw_ip(chain_idx),
285 'ip_src_tg_gw': self.tg_gw_ip_block.get_ip(chain_idx),
286 'ip_dst_tg_gw': peer.tg_gw_ip_block.get_ip(chain_idx),
287 'vlan_tag': self.vlans[chain_idx] if self.vlans else None,
289 'vtep_vlan': self.vtep_vlan if self.vtep_vlan else None,
290 'vtep_src_mac': self.mac if self.vxlan is True else None,
291 'vtep_dst_mac': self.vtep_dst_mac if self.vxlan is True else None,
292 'vtep_dst_ip': self.vtep_dst_ip if self.vxlan is True else None,
293 'vtep_src_ip': self.vtep_src_ip if self.vxlan is True else None,
294 'net_vni': self.vnis[chain_idx] if self.vxlan is True else None
296 # after first chain, fall back to the flow count for all other chains
297 cur_chain_flow_count = flows_per_chain
302 """Convert an IP address from string to numeric."""
303 return struct.unpack("!I", socket.inet_aton(addr))[0]
306 def int_to_ip(nvalue):
307 """Convert an IP address from numeric to string."""
308 return socket.inet_ntoa(struct.pack("!I", nvalue))
311 class GeneratorConfig(object):
312 """Represents traffic configuration for currently running traffic profile."""
314 DEFAULT_IP_STEP = '0.0.0.1'
315 DEFAULT_SRC_DST_IP_STEP = '0.0.0.1'
317 def __init__(self, config):
318 """Create a generator config."""
320 # name of the generator profile (normally trex or dummy)
321 # pick the default one if not specified explicitly from cli options
322 if not config.generator_profile:
323 config.generator_profile = config.traffic_generator.default_profile
324 # pick up the profile dict based on the name
325 gen_config = self.__match_generator_profile(config.traffic_generator,
326 config.generator_profile)
327 self.gen_config = gen_config
328 # copy over fields from the dict
329 self.tool = gen_config.tool
330 self.ip = gen_config.ip
331 # overrides on config.cores and config.mbuf_factor
333 self.cores = config.cores
335 self.cores = gen_config.get('cores', 1)
336 self.mbuf_factor = config.mbuf_factor
337 if gen_config.intf_speed:
338 # interface speed is overriden from config
339 self.intf_speed = bitmath.parse_string(gen_config.intf_speed.replace('ps', '')).bits
341 # interface speed is discovered/provided by the traffic generator
343 self.name = gen_config.name
344 self.zmq_pub_port = gen_config.get('zmq_pub_port', 4500)
345 self.zmq_rpc_port = gen_config.get('zmq_rpc_port', 4501)
346 self.limit_memory = gen_config.get('limit_memory', 1024)
347 self.software_mode = gen_config.get('software_mode', False)
348 self.interfaces = gen_config.interfaces
349 if self.interfaces[0].port != 0 or self.interfaces[1].port != 1:
350 raise TrafficClientException('Invalid port order/id in generator_profile.interfaces')
351 if hasattr(gen_config, 'platform'):
352 self.platform = gen_config.platform
353 self.service_chain = config.service_chain
354 self.service_chain_count = config.service_chain_count
355 self.flow_count = config.flow_count
356 self.host_name = gen_config.host_name
358 self.tg_gateway_ip_addrs = gen_config.tg_gateway_ip_addrs
359 self.ip_addrs = gen_config.ip_addrs
360 self.ip_addrs_step = gen_config.ip_addrs_step or self.DEFAULT_SRC_DST_IP_STEP
361 self.tg_gateway_ip_addrs_step = \
362 gen_config.tg_gateway_ip_addrs_step or self.DEFAULT_IP_STEP
363 self.gateway_ip_addrs_step = gen_config.gateway_ip_addrs_step or self.DEFAULT_IP_STEP
364 self.gateway_ips = gen_config.gateway_ip_addrs
365 self.udp_src_port = gen_config.udp_src_port
366 self.udp_dst_port = gen_config.udp_dst_port
367 self.vteps = gen_config.get('vteps')
368 self.devices = [Device(port, self) for port in [0, 1]]
369 # This should normally always be [0, 1]
370 self.ports = [device.port for device in self.devices]
372 # check that pci is not empty
373 if not gen_config.interfaces[0].get('pci', None) or \
374 not gen_config.interfaces[1].get('pci', None):
375 raise TrafficClientException("configuration interfaces pci fields cannot be empty")
377 self.pcis = [tgif['pci'] for tgif in gen_config.interfaces]
378 self.vlan_tagging = config.vlan_tagging
380 # needed for result/summarizer
381 config['tg-name'] = gen_config.name
382 config['tg-tool'] = self.tool
385 """Get json form to display the content into the overall result dict."""
386 return dict(self.gen_config)
388 def set_dest_macs(self, port_index, dest_macs):
389 """Set the list of dest MACs indexed by the chain id on given port.
391 port_index: the port for which dest macs must be set
392 dest_macs: a list of dest MACs indexed by chain id
394 if len(dest_macs) != self.config.service_chain_count:
395 raise TrafficClientException('Dest MAC list %s must have %d entries' %
396 (dest_macs, self.config.service_chain_count))
397 self.devices[port_index].set_dest_macs(dest_macs)
398 LOG.info('Port %d: dst MAC %s', port_index, [str(mac) for mac in dest_macs])
400 def set_vtep_dest_macs(self, port_index, dest_macs):
401 """Set the list of dest MACs indexed by the chain id on given port.
403 port_index: the port for which dest macs must be set
404 dest_macs: a list of dest MACs indexed by chain id
406 if len(dest_macs) != self.config.service_chain_count:
407 raise TrafficClientException('Dest MAC list %s must have %d entries' %
408 (dest_macs, self.config.service_chain_count))
409 self.devices[port_index].set_vtep_dst_mac(dest_macs)
410 LOG.info('Port %d: vtep dst MAC %s', port_index, set([str(mac) for mac in dest_macs]))
412 def get_dest_macs(self):
413 """Return the list of dest macs indexed by port."""
414 return [dev.get_dest_macs() for dev in self.devices]
416 def set_vlans(self, port_index, vlans):
417 """Set the list of vlans to use indexed by the chain id on given port.
419 port_index: the port for which VLANs must be set
420 vlans: a list of vlan lists indexed by chain id
422 if len(vlans) != self.config.service_chain_count:
423 raise TrafficClientException('VLAN list %s must have %d entries' %
424 (vlans, self.config.service_chain_count))
425 self.devices[port_index].set_vlans(vlans)
427 def set_vxlans(self, port_index, vxlans):
428 """Set the list of vxlans (VNIs) to use indexed by the chain id on given port.
430 port_index: the port for which VXLANs must be set
431 VXLANs: a list of VNIs lists indexed by chain id
433 if len(vxlans) != self.config.service_chain_count:
434 raise TrafficClientException('VXLAN list %s must have %d entries' %
435 (vxlans, self.config.service_chain_count))
436 self.devices[port_index].set_vxlans(vxlans)
438 def set_vtep_vlan(self, port_index, vlan):
439 """Set the vtep vlan to use indexed by the chain id on given port.
440 port_index: the port for which VLAN must be set
442 self.devices[port_index].set_vtep_vlan(vlan)
444 def set_vxlan_endpoints(self, port_index, src_ip, dst_ip):
445 self.devices[port_index].set_vxlan_endpoints(src_ip, dst_ip)
448 def __match_generator_profile(traffic_generator, generator_profile):
449 gen_config = AttrDict(traffic_generator)
450 gen_config.pop('default_profile')
451 gen_config.pop('generator_profile')
452 matching_profile = [profile for profile in traffic_generator.generator_profile if
453 profile.name == generator_profile]
454 if len(matching_profile) != 1:
455 raise Exception('Traffic generator profile not found: ' + generator_profile)
457 gen_config.update(matching_profile[0])
461 class TrafficClient(object):
462 """Traffic generator client with NDR/PDR binary seearch."""
466 def __init__(self, config, notifier=None):
467 """Create a new TrafficClient instance.
469 config: nfvbench config
470 notifier: notifier (optional)
472 A new instance is created everytime the nfvbench config may have changed.
475 self.generator_config = GeneratorConfig(config)
476 self.tool = self.generator_config.tool
477 self.gen = self._get_generator()
478 self.notifier = notifier
479 self.interval_collector = None
480 self.iteration_collector = None
481 self.runner = TrafficRunner(self, self.config.duration_sec, self.config.interval_sec)
482 self.config.frame_sizes = self._get_frame_sizes()
484 'l2frame_size': None,
485 'duration_sec': self.config.duration_sec,
486 'bidirectional': True,
487 'rates': [] # to avoid unsbuscriptable-obj warning
489 self.current_total_rate = {'rate_percent': '10'}
490 if self.config.single_run:
491 self.current_total_rate = utils.parse_rate_str(self.config.rate)
493 # Speed is either discovered when connecting to TG or set from config
494 # This variable is 0 if not yet discovered from TG or must be the speed of
495 # each interface in bits per second
496 self.intf_speed = self.generator_config.intf_speed
498 def _get_generator(self):
499 tool = self.tool.lower()
501 from traffic_gen import trex
502 return trex.TRex(self)
504 from traffic_gen import dummy
505 return dummy.DummyTG(self)
506 raise TrafficClientException('Unsupported generator tool name:' + self.tool)
508 def skip_sleep(self):
509 """Skip all sleeps when doing unit testing with dummy TG.
511 Must be overriden using mock.patch
515 def _get_frame_sizes(self):
516 traffic_profile_name = self.config.traffic.profile
517 matching_profiles = [profile for profile in self.config.traffic_profile if
518 profile.name == traffic_profile_name]
519 if len(matching_profiles) > 1:
520 raise TrafficClientException('Multiple traffic profiles with name: ' +
521 traffic_profile_name)
522 elif not matching_profiles:
523 raise TrafficClientException('Cannot find traffic profile: ' + traffic_profile_name)
524 return matching_profiles[0].l2frame_size
526 def start_traffic_generator(self):
527 """Start the traffic generator process (traffic not started yet)."""
529 # pick up the interface speed if it is not set from config
530 intf_speeds = self.gen.get_port_speed_gbps()
531 # convert Gbps unit into bps
532 tg_if_speed = bitmath.parse_string(str(intf_speeds[0]) + 'Gb').bits
534 # interface speed is overriden from config
535 if self.intf_speed != tg_if_speed:
536 # Warn the user if the speed in the config is different
537 LOG.warning('Interface speed provided is different from actual speed (%d Gbps)',
540 # interface speed not provisioned by config
541 self.intf_speed = tg_if_speed
542 # also update the speed in the tg config
543 self.generator_config.intf_speed = tg_if_speed
545 # Save the traffic generator local MAC
546 for mac, device in zip(self.gen.get_macs(), self.generator_config.devices):
550 """Set up the traffic client."""
551 self.gen.clear_stats()
553 def get_version(self):
554 """Get the traffic generator version."""
555 return self.gen.get_version()
557 def ensure_end_to_end(self):
558 """Ensure traffic generator receives packets it has transmitted.
560 This ensures end to end connectivity and also waits until VMs are ready to forward packets.
562 VMs that are started and in active state may not pass traffic yet. It is imperative to make
563 sure that all VMs are passing traffic in both directions before starting any benchmarking.
564 To verify this, we need to send at a low frequency bi-directional packets and make sure
565 that we receive all packets back from all VMs. The number of flows is equal to 2 times
566 the number of chains (1 per direction) and we need to make sure we receive packets coming
567 from exactly 2 x chain count different source MAC addresses.
570 PVP chain (1 VM per chain)
571 N = 10 (number of chains)
572 Flow count = 20 (number of flows)
573 If the number of unique source MAC addresses from received packets is 20 then
574 all 10 VMs 10 VMs are in operational state.
576 LOG.info('Starting traffic generator to ensure end-to-end connectivity')
577 # send 2pps on each chain and each direction
578 rate_pps = {'rate_pps': str(self.config.service_chain_count * 2)}
579 self.gen.create_traffic('64', [rate_pps, rate_pps], bidirectional=True, latency=False)
581 # ensures enough traffic is coming back
582 retry_count = (self.config.check_traffic_time_sec +
583 self.config.generic_poll_sec - 1) / self.config.generic_poll_sec
585 # we expect to see packets coming from 2 unique MAC per chain
586 # because there can be flooding in the case of shared net
587 # we must verify that packets from the right VMs are received
588 # and not just count unique src MAC
589 # create a dict of (port, chain) tuples indexed by dest mac
591 for port, dest_macs in enumerate(self.generator_config.get_dest_macs()):
592 for chain, mac in enumerate(dest_macs):
593 mac_map[mac] = (port, chain)
594 unique_src_mac_count = len(mac_map)
595 if self.config.vxlan and self.config.traffic_generator.vtep_vlan:
596 get_mac_id = lambda packet: packet['binary'][60:66]
597 elif self.config.vxlan:
598 get_mac_id = lambda packet: packet['binary'][56:62]
600 get_mac_id = lambda packet: packet['binary'][6:12]
601 for it in xrange(retry_count):
602 self.gen.clear_stats()
603 self.gen.start_traffic()
604 self.gen.start_capture()
605 LOG.info('Captured unique src mac %d/%d, capturing return packets (retry %d/%d)...',
606 unique_src_mac_count - len(mac_map), unique_src_mac_count,
608 if not self.skip_sleep():
609 time.sleep(self.config.generic_poll_sec)
610 self.gen.stop_traffic()
611 self.gen.fetch_capture_packets()
612 self.gen.stop_capture()
614 for packet in self.gen.packet_list:
615 mac_id = get_mac_id(packet)
616 src_mac = ':'.join(["%02x" % ord(x) for x in mac_id])
617 if src_mac in mac_map:
618 port, chain = mac_map[src_mac]
619 LOG.info('Received packet from mac: %s (chain=%d, port=%d)',
620 src_mac, chain, port)
621 mac_map.pop(src_mac, None)
624 LOG.info('End-to-end connectivity established')
627 raise TrafficClientException('End-to-end connectivity cannot be ensured')
629 def ensure_arp_successful(self):
630 """Resolve all IP using ARP and throw an exception in case of failure."""
631 dest_macs = self.gen.resolve_arp()
633 # all dest macs are discovered, saved them into the generator config
634 if self.config.vxlan:
635 self.generator_config.set_vtep_dest_macs(0, dest_macs[0])
636 self.generator_config.set_vtep_dest_macs(1, dest_macs[1])
638 self.generator_config.set_dest_macs(0, dest_macs[0])
639 self.generator_config.set_dest_macs(1, dest_macs[1])
641 raise TrafficClientException('ARP cannot be resolved')
643 def set_traffic(self, frame_size, bidirectional):
644 """Reconfigure the traffic generator for a new frame size."""
645 self.run_config['bidirectional'] = bidirectional
646 self.run_config['l2frame_size'] = frame_size
647 self.run_config['rates'] = [self.get_per_direction_rate()]
649 self.run_config['rates'].append(self.get_per_direction_rate())
651 unidir_reverse_pps = int(self.config.unidir_reverse_traffic_pps)
652 if unidir_reverse_pps > 0:
653 self.run_config['rates'].append({'rate_pps': str(unidir_reverse_pps)})
654 # Fix for [NFVBENCH-67], convert the rate string to PPS
655 for idx, rate in enumerate(self.run_config['rates']):
656 if 'rate_pps' not in rate:
657 self.run_config['rates'][idx] = {'rate_pps': self.__convert_rates(rate)['rate_pps']}
659 self.gen.clear_streamblock()
660 self.gen.create_traffic(frame_size, self.run_config['rates'], bidirectional, latency=True)
662 def _modify_load(self, load):
663 self.current_total_rate = {'rate_percent': str(load)}
664 rate_per_direction = self.get_per_direction_rate()
666 self.gen.modify_rate(rate_per_direction, False)
667 self.run_config['rates'][0] = rate_per_direction
668 if self.run_config['bidirectional']:
669 self.gen.modify_rate(rate_per_direction, True)
670 self.run_config['rates'][1] = rate_per_direction
672 def get_ndr_and_pdr(self):
673 """Start the NDR/PDR iteration and return the results."""
674 dst = 'Bidirectional' if self.run_config['bidirectional'] else 'Unidirectional'
676 if self.config.ndr_run:
677 LOG.info('*** Searching NDR for %s (%s)...', self.run_config['l2frame_size'], dst)
678 targets['ndr'] = self.config.measurement.NDR
679 if self.config.pdr_run:
680 LOG.info('*** Searching PDR for %s (%s)...', self.run_config['l2frame_size'], dst)
681 targets['pdr'] = self.config.measurement.PDR
683 self.run_config['start_time'] = time.time()
684 self.interval_collector = IntervalCollector(self.run_config['start_time'])
685 self.interval_collector.attach_notifier(self.notifier)
686 self.iteration_collector = IterationCollector(self.run_config['start_time'])
688 self.__range_search(0.0, 200.0, targets, results)
690 results['iteration_stats'] = {
691 'ndr_pdr': self.iteration_collector.get()
694 if self.config.ndr_run:
695 LOG.info('NDR load: %s', results['ndr']['rate_percent'])
696 results['ndr']['time_taken_sec'] = \
697 results['ndr']['timestamp_sec'] - self.run_config['start_time']
698 if self.config.pdr_run:
699 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
700 results['pdr']['time_taken_sec'] = \
701 results['pdr']['timestamp_sec'] - results['ndr']['timestamp_sec']
703 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
704 results['pdr']['time_taken_sec'] = \
705 results['pdr']['timestamp_sec'] - self.run_config['start_time']
708 def __get_dropped_rate(self, result):
709 dropped_pkts = result['rx']['dropped_pkts']
710 total_pkts = result['tx']['total_pkts']
713 return float(dropped_pkts) / total_pkts * 100
716 """Collect final stats for previous run."""
717 stats = self.gen.get_stats()
718 retDict = {'total_tx_rate': stats['total_tx_rate']}
719 for port in self.PORTS:
720 retDict[port] = {'tx': {}, 'rx': {}}
722 tx_keys = ['total_pkts', 'total_pkt_bytes', 'pkt_rate', 'pkt_bit_rate']
723 rx_keys = tx_keys + ['dropped_pkts']
725 for port in self.PORTS:
727 retDict[port]['tx'][key] = int(stats[port]['tx'][key])
730 retDict[port]['rx'][key] = int(stats[port]['rx'][key])
732 retDict[port]['rx'][key] = 0
733 retDict[port]['rx']['avg_delay_usec'] = cast_integer(
734 stats[port]['rx']['avg_delay_usec'])
735 retDict[port]['rx']['min_delay_usec'] = cast_integer(
736 stats[port]['rx']['min_delay_usec'])
737 retDict[port]['rx']['max_delay_usec'] = cast_integer(
738 stats[port]['rx']['max_delay_usec'])
739 retDict[port]['drop_rate_percent'] = self.__get_dropped_rate(retDict[port])
741 ports = sorted(retDict.keys())
742 if self.run_config['bidirectional']:
743 retDict['overall'] = {'tx': {}, 'rx': {}}
745 retDict['overall']['tx'][key] = \
746 retDict[ports[0]]['tx'][key] + retDict[ports[1]]['tx'][key]
748 retDict['overall']['rx'][key] = \
749 retDict[ports[0]]['rx'][key] + retDict[ports[1]]['rx'][key]
750 total_pkts = [retDict[ports[0]]['rx']['total_pkts'],
751 retDict[ports[1]]['rx']['total_pkts']]
752 avg_delays = [retDict[ports[0]]['rx']['avg_delay_usec'],
753 retDict[ports[1]]['rx']['avg_delay_usec']]
754 max_delays = [retDict[ports[0]]['rx']['max_delay_usec'],
755 retDict[ports[1]]['rx']['max_delay_usec']]
756 min_delays = [retDict[ports[0]]['rx']['min_delay_usec'],
757 retDict[ports[1]]['rx']['min_delay_usec']]
758 retDict['overall']['rx']['avg_delay_usec'] = utils.weighted_avg(total_pkts, avg_delays)
759 retDict['overall']['rx']['min_delay_usec'] = min(min_delays)
760 retDict['overall']['rx']['max_delay_usec'] = max(max_delays)
761 for key in ['pkt_bit_rate', 'pkt_rate']:
762 for dirc in ['tx', 'rx']:
763 retDict['overall'][dirc][key] /= 2.0
765 retDict['overall'] = retDict[ports[0]]
766 retDict['overall']['drop_rate_percent'] = self.__get_dropped_rate(retDict['overall'])
769 def __convert_rates(self, rate):
770 return utils.convert_rates(self.run_config['l2frame_size'],
774 def __ndr_pdr_found(self, tag, load):
775 rates = self.__convert_rates({'rate_percent': load})
776 self.iteration_collector.add_ndr_pdr(tag, rates['rate_pps'])
777 last_stats = self.iteration_collector.peek()
778 self.interval_collector.add_ndr_pdr(tag, last_stats)
780 def __format_output_stats(self, stats):
781 for key in self.PORTS + ['overall']:
782 interface = stats[key]
784 'tx_pkts': interface['tx']['total_pkts'],
785 'rx_pkts': interface['rx']['total_pkts'],
786 'drop_percentage': interface['drop_rate_percent'],
787 'drop_pct': interface['rx']['dropped_pkts'],
788 'avg_delay_usec': interface['rx']['avg_delay_usec'],
789 'max_delay_usec': interface['rx']['max_delay_usec'],
790 'min_delay_usec': interface['rx']['min_delay_usec'],
795 def __targets_found(self, rate, targets, results):
796 for tag, target in targets.iteritems():
797 LOG.info('Found %s (%s) load: %s', tag, target, rate)
798 self.__ndr_pdr_found(tag, rate)
799 results[tag]['timestamp_sec'] = time.time()
801 def __range_search(self, left, right, targets, results):
802 """Perform a binary search for a list of targets inside a [left..right] range or rate.
804 left the left side of the range to search as a % the line rate (100 = 100% line rate)
805 indicating the rate to send on each interface
806 right the right side of the range to search as a % of line rate
807 indicating the rate to send on each interface
808 targets a dict of drop rates to search (0.1 = 0.1%), indexed by the DR name or "tag"
810 results a dict to store results
814 LOG.info('Range search [%s .. %s] targets: %s', left, right, targets)
816 # Terminate search when gap is less than load epsilon
817 if right - left < self.config.measurement.load_epsilon:
818 self.__targets_found(left, targets, results)
821 # Obtain the average drop rate in for middle load
822 middle = (left + right) / 2.0
824 stats, rates = self.__run_search_iteration(middle)
826 LOG.exception("Got exception from traffic generator during binary search")
827 self.__targets_found(left, targets, results)
829 # Split target dicts based on the avg drop rate
832 for tag, target in targets.iteritems():
833 if stats['overall']['drop_rate_percent'] <= target:
834 # record the best possible rate found for this target
836 results[tag].update({
837 'load_percent_per_direction': middle,
838 'stats': self.__format_output_stats(dict(stats)),
839 'timestamp_sec': None
841 right_targets[tag] = target
843 # initialize to 0 all fields of result for
844 # the worst case scenario of the binary search (if ndr/pdr is not found)
845 if tag not in results:
846 results[tag] = dict.fromkeys(rates, 0)
847 empty_stats = self.__format_output_stats(dict(stats))
848 for key in empty_stats:
849 if isinstance(empty_stats[key], dict):
850 empty_stats[key] = dict.fromkeys(empty_stats[key], 0)
853 results[tag].update({
854 'load_percent_per_direction': 0,
855 'stats': empty_stats,
856 'timestamp_sec': None
858 left_targets[tag] = target
861 self.__range_search(left, middle, left_targets, results)
863 # search upper half only if the upper rate does not exceed
864 # 100%, this only happens when the first search at 100%
865 # yields a DR that is < target DR
867 self.__targets_found(100, right_targets, results)
869 self.__range_search(middle, right, right_targets, results)
871 def __run_search_iteration(self, rate):
872 """Run one iteration at the given rate level.
874 rate: the rate to send on each port in percent (0 to 100)
876 self._modify_load(rate)
878 # poll interval stats and collect them
879 for stats in self.run_traffic():
880 self.interval_collector.add(stats)
881 time_elapsed_ratio = self.runner.time_elapsed() / self.run_config['duration_sec']
882 if time_elapsed_ratio >= 1:
883 self.cancel_traffic()
884 if not self.skip_sleep():
885 time.sleep(self.config.pause_sec)
886 self.interval_collector.reset()
888 # get stats from the run
889 stats = self.runner.client.get_stats()
890 current_traffic_config = self._get_traffic_config()
891 warning = self.compare_tx_rates(current_traffic_config['direction-total']['rate_pps'],
892 stats['total_tx_rate'])
893 if warning is not None:
894 stats['warning'] = warning
896 # save reliable stats from whole iteration
897 self.iteration_collector.add(stats, current_traffic_config['direction-total']['rate_pps'])
898 LOG.info('Average drop rate: %f', stats['overall']['drop_rate_percent'])
899 return stats, current_traffic_config['direction-total']
902 def log_stats(stats):
903 """Log estimated stats during run."""
905 'datetime': str(datetime.now()),
906 'tx_packets': stats['overall']['tx']['total_pkts'],
907 'rx_packets': stats['overall']['rx']['total_pkts'],
908 'drop_packets': stats['overall']['rx']['dropped_pkts'],
909 'drop_rate_percent': stats['overall']['drop_rate_percent']
911 LOG.info('TX: %(tx_packets)d; '
912 'RX: %(rx_packets)d; '
913 'Est. Dropped: %(drop_packets)d; '
914 'Est. Drop rate: %(drop_rate_percent).4f%%',
917 def run_traffic(self):
918 """Start traffic and return intermediate stats for each interval."""
919 stats = self.runner.run()
920 while self.runner.is_running:
921 self.log_stats(stats)
923 stats = self.runner.poll_stats()
926 self.log_stats(stats)
927 LOG.info('Drop rate: %f', stats['overall']['drop_rate_percent'])
930 def cancel_traffic(self):
934 def _get_traffic_config(self):
939 for idx, rate in enumerate(self.run_config['rates']):
940 key = 'direction-forward' if idx == 0 else 'direction-reverse'
942 'l2frame_size': self.run_config['l2frame_size'],
943 'duration_sec': self.run_config['duration_sec']
945 config[key].update(rate)
946 config[key].update(self.__convert_rates(rate))
947 load_total += float(config[key]['rate_percent'])
948 bps_total += float(config[key]['rate_bps'])
949 pps_total += float(config[key]['rate_pps'])
950 config['direction-total'] = dict(config['direction-forward'])
951 config['direction-total'].update({
952 'rate_percent': load_total,
953 'rate_pps': cast_integer(pps_total),
954 'rate_bps': bps_total
959 def get_run_config(self, results):
960 """Return configuration which was used for the last run."""
962 # because we want each direction to have the far end RX rates,
963 # use the far end index (1-idx) to retrieve the RX rates
964 for idx, key in enumerate(["direction-forward", "direction-reverse"]):
965 tx_rate = results["stats"][idx]["tx"]["total_pkts"] / self.config.duration_sec
966 rx_rate = results["stats"][1 - idx]["rx"]["total_pkts"] / self.config.duration_sec
968 "orig": self.__convert_rates(self.run_config['rates'][idx]),
969 "tx": self.__convert_rates({'rate_pps': tx_rate}),
970 "rx": self.__convert_rates({'rate_pps': rx_rate})
974 for direction in ['orig', 'tx', 'rx']:
975 total[direction] = {}
976 for unit in ['rate_percent', 'rate_bps', 'rate_pps']:
977 total[direction][unit] = sum([float(x[direction][unit]) for x in r.values()])
979 r['direction-total'] = total
982 def insert_interface_stats(self, pps_list):
983 """Insert interface stats to a list of packet path stats.
985 pps_list: a list of packet path stats instances indexed by chain index
987 This function will insert the packet path stats for the traffic gen ports 0 and 1
988 with itemized per chain tx/rx counters.
989 There will be as many packet path stats as chains.
990 Each packet path stats will have exactly 2 InterfaceStats for port 0 and port 1
993 PacketPathStats(InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)),
994 PacketPathStats(InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)),
998 def get_if_stats(chain_idx):
999 return [InterfaceStats('p' + str(port), self.tool)
1000 for port in range(2)]
1001 # keep the list of list of interface stats indexed by the chain id
1002 self.ifstats = [get_if_stats(chain_idx)
1003 for chain_idx in range(self.config.service_chain_count)]
1004 # note that we need to make a copy of the ifs list so that any modification in the
1005 # list from pps will not change the list saved in self.ifstats
1006 self.pps_list = [PacketPathStats(list(ifs)) for ifs in self.ifstats]
1007 # insert the corresponding pps in the passed list
1008 pps_list.extend(self.pps_list)
1010 def update_interface_stats(self, diff=False):
1011 """Update all interface stats.
1013 diff: if False, simply refresh the interface stats values with latest values
1014 if True, diff the interface stats with the latest values
1015 Make sure that the interface stats inserted in insert_interface_stats() are updated
1019 [InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)],
1020 [InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)],
1025 stats = self.gen.get_stats()
1026 for chain_idx, ifs in enumerate(self.ifstats):
1027 # each ifs has exactly 2 InterfaceStats and 2 Latency instances
1028 # corresponding to the
1029 # port 0 and port 1 for the given chain_idx
1030 # Note that we cannot use self.pps_list[chain_idx].if_stats to pick the
1031 # interface stats for the pps because it could have been modified to contain
1032 # additional interface stats
1033 self.gen.get_stream_stats(stats, ifs, self.pps_list[chain_idx].latencies, chain_idx)
1034 # special handling for vxlan
1035 # in case of vxlan, flow stats are not available so all rx counters will be
1036 # zeros when the total rx port counter is non zero.
1038 for port in range(2):
1040 for ifs in self.ifstats:
1041 total_rx += ifs[port].rx
1043 # check if the total port rx from Trex is also zero
1044 port_rx = stats[port]['rx']['total_pkts']
1046 # the total rx for all chains from port level stats is non zero
1047 # which means that the per-chain stats are not available
1048 if len(self.ifstats) == 1:
1049 # only one chain, simply report the port level rx to the chain rx stats
1050 self.ifstats[0][port].rx = port_rx
1052 for ifs in self.ifstats:
1053 # mark this data as unavailable
1055 # pitch in the total rx only in the last chain pps
1056 self.ifstats[-1][port].rx_total = port_rx
1059 def compare_tx_rates(required, actual):
1060 """Compare the actual TX rate to the required TX rate."""
1062 are_different = False
1064 if float(actual) / required < threshold:
1065 are_different = True
1066 except ZeroDivisionError:
1067 are_different = True
1070 msg = "WARNING: There is a significant difference between requested TX rate ({r}) " \
1071 "and actual TX rate ({a}). The traffic generator may not have sufficient CPU " \
1072 "to achieve the requested TX rate.".format(r=required, a=actual)
1078 def get_per_direction_rate(self):
1079 """Get the rate for each direction."""
1080 divisor = 2 if self.run_config['bidirectional'] else 1
1081 if 'rate_percent' in self.current_total_rate:
1082 # don't split rate if it's percentage
1085 return utils.divide_rate(self.current_total_rate, divisor)
1088 """Close this instance."""
1090 self.gen.stop_traffic()
1093 self.gen.clear_stats()