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.api import Ether
27 from trex.stl.api import STLError
28 from trex.stl.api import UDP
29 # pylint: enable=import-error
32 from packet_stats import InterfaceStats
33 from packet_stats import PacketPathStats
34 from stats_collector import IntervalCollector
35 from stats_collector import IterationCollector
36 import traffic_gen.traffic_utils as utils
37 from utils import cast_integer
40 class TrafficClientException(Exception):
41 """Generic traffic client exception."""
46 class TrafficRunner(object):
47 """Serialize various steps required to run traffic."""
49 def __init__(self, client, duration_sec, interval_sec=0):
50 """Create a traffic runner."""
52 self.start_time = None
53 self.duration_sec = duration_sec
54 self.interval_sec = interval_sec
57 """Clear stats and instruct the traffic generator to start generating traffic."""
60 LOG.info('Running traffic generator')
61 self.client.gen.clear_stats()
62 self.client.gen.start_traffic()
63 self.start_time = time.time()
64 return self.poll_stats()
67 """Stop the current run and instruct the traffic generator to stop traffic."""
69 self.start_time = None
70 self.client.gen.stop_traffic()
73 """Check if a run is still pending."""
74 return self.start_time is not None
76 def time_elapsed(self):
77 """Return time elapsed since start of run."""
79 return time.time() - self.start_time
80 return self.duration_sec
83 """Poll latest stats from the traffic generator at fixed interval - sleeps if necessary.
85 return: latest stats or None if traffic is stopped
87 if not self.is_running():
89 if self.client.skip_sleep():
91 return self.client.get_stats()
92 time_elapsed = self.time_elapsed()
93 if time_elapsed > self.duration_sec:
96 time_left = self.duration_sec - time_elapsed
97 if self.interval_sec > 0.0:
98 if time_left <= self.interval_sec:
102 time.sleep(self.interval_sec)
104 time.sleep(self.duration_sec)
106 return self.client.get_stats()
109 class IpBlock(object):
110 """Manage a block of IP addresses."""
112 def __init__(self, base_ip, step_ip, count_ip):
113 """Create an IP block."""
114 self.base_ip_int = Device.ip_to_int(base_ip)
115 self.step = Device.ip_to_int(step_ip)
116 self.max_available = count_ip
119 def get_ip(self, index=0):
120 """Return the IP address at given index."""
121 if index < 0 or index >= self.max_available:
122 raise IndexError('Index out of bounds: %d (max=%d)' % (index, self.max_available))
123 return Device.int_to_ip(self.base_ip_int + index * self.step)
125 def reserve_ip_range(self, count):
126 """Reserve a range of count consecutive IP addresses spaced by step."""
127 if self.next_free + count > self.max_available:
128 raise IndexError('No more IP addresses next free=%d max_available=%d requested=%d' %
132 first_ip = self.get_ip(self.next_free)
133 last_ip = self.get_ip(self.next_free + count - 1)
134 self.next_free += count
135 return (first_ip, last_ip)
137 def reset_reservation(self):
138 """Reset all reservations and restart with a completely unused IP block."""
142 class Device(object):
143 """Represent a port device and all information associated to it.
145 In the curent version we only support 2 port devices for the traffic generator
146 identified as port 0 or port 1.
149 def __init__(self, port, generator_config):
150 """Create a new device for a given port."""
151 self.generator_config = generator_config
152 self.chain_count = generator_config.service_chain_count
153 self.flow_count = generator_config.flow_count / 2
155 self.switch_port = generator_config.interfaces[port].get('switch_port', None)
156 self.vtep_vlan = None
157 self.vtep_src_mac = None
159 self.pci = generator_config.interfaces[port].pci
161 self.dest_macs = None
162 self.vtep_dst_mac = None
163 self.vtep_dst_ip = None
164 if generator_config.vteps is None:
165 self.vtep_src_ip = None
167 self.vtep_src_ip = generator_config.vteps[port]
170 self.ip_addrs = generator_config.ip_addrs[port]
171 subnet = IPNetwork(self.ip_addrs)
172 self.ip = subnet.ip.format()
173 self.ip_addrs_step = generator_config.ip_addrs_step
174 self.ip_block = IpBlock(self.ip, self.ip_addrs_step, self.flow_count)
175 self.gw_ip_block = IpBlock(generator_config.gateway_ips[port],
176 generator_config.gateway_ip_addrs_step,
178 self.tg_gateway_ip_addrs = generator_config.tg_gateway_ip_addrs[port]
179 self.tg_gw_ip_block = IpBlock(self.tg_gateway_ip_addrs,
180 generator_config.tg_gateway_ip_addrs_step,
182 self.udp_src_port = generator_config.udp_src_port
183 self.udp_dst_port = generator_config.udp_dst_port
185 def set_mac(self, mac):
186 """Set the local MAC for this port device."""
188 raise TrafficClientException('Trying to set traffic generator MAC address as None')
191 def get_peer_device(self):
192 """Get the peer device (device 0 -> device 1, or device 1 -> device 0)."""
193 return self.generator_config.devices[1 - self.port]
195 def set_vtep_dst_mac(self, dest_macs):
196 """Set the list of dest MACs indexed by the chain id.
198 This is only called in 2 cases:
199 - VM macs discovered using openstack API
200 - dest MACs provisioned in config file
202 self.vtep_dst_mac = map(str, dest_macs)
204 def set_dest_macs(self, dest_macs):
205 """Set the list of dest MACs indexed by the chain id.
207 This is only called in 2 cases:
208 - VM macs discovered using openstack API
209 - dest MACs provisioned in config file
211 self.dest_macs = map(str, dest_macs)
213 def get_dest_macs(self):
214 """Get the list of dest macs for this device.
216 If set_dest_macs was never called, assumes l2-loopback and return
217 a list of peer mac (as many as chains but normally only 1 chain)
220 return self.dest_macs
221 # assume this is l2-loopback
222 return [self.get_peer_device().mac] * self.chain_count
224 def set_vlans(self, vlans):
225 """Set the list of vlans to use indexed by the chain id."""
227 LOG.info("Port %d: VLANs %s", self.port, self.vlans)
229 def set_vtep_vlan(self, vlan):
230 """Set the vtep vlan to use indexed by specific port."""
231 self.vtep_vlan = vlan
233 self.vlan_tagging = None
234 LOG.info("Port %d: VTEP VLANs %s", self.port, self.vtep_vlan)
236 def set_vxlan_endpoints(self, src_ip, dst_ip):
237 self.vtep_dst_ip = dst_ip
238 self.vtep_src_ip = src_ip
239 LOG.info("Port %d: src_vtep %s, dst_vtep %s", self.port,
240 self.vtep_src_ip, self.vtep_dst_ip)
242 def set_vxlans(self, vnis):
244 LOG.info("Port %d: VNIs %s", self.port, self.vnis)
246 def set_gw_ip(self, gateway_ip):
247 self.gw_ip_block = IpBlock(gateway_ip,
248 self.generator_config.gateway_ip_addrs_step,
251 def get_gw_ip(self, chain_index):
252 """Retrieve the IP address assigned for the gateway of a given chain."""
253 return self.gw_ip_block.get_ip(chain_index)
255 def get_stream_configs(self):
256 """Get the stream config for a given chain on this device.
258 Called by the traffic generator driver to program the traffic generator properly
259 before generating traffic
262 # exact flow count for each chain is calculated as follows:
263 # - all chains except the first will have the same flow count
264 # calculated as (total_flows + chain_count - 1) / chain_count
265 # - the first chain will have the remainder
266 # example 11 flows and 3 chains => 3, 4, 4
267 flows_per_chain = (self.flow_count + self.chain_count - 1) / self.chain_count
268 cur_chain_flow_count = self.flow_count - flows_per_chain * (self.chain_count - 1)
269 peer = self.get_peer_device()
270 self.ip_block.reset_reservation()
271 peer.ip_block.reset_reservation()
272 dest_macs = self.get_dest_macs()
274 for chain_idx in xrange(self.chain_count):
275 src_ip_first, src_ip_last = self.ip_block.reserve_ip_range(cur_chain_flow_count)
276 dst_ip_first, dst_ip_last = peer.ip_block.reserve_ip_range(cur_chain_flow_count)
279 'count': cur_chain_flow_count,
281 'mac_dst': dest_macs[chain_idx],
282 'ip_src_addr': src_ip_first,
283 'ip_src_addr_max': src_ip_last,
284 'ip_src_count': cur_chain_flow_count,
285 'ip_dst_addr': dst_ip_first,
286 'ip_dst_addr_max': dst_ip_last,
287 'ip_dst_count': cur_chain_flow_count,
288 'ip_addrs_step': self.ip_addrs_step,
289 'udp_src_port': self.udp_src_port,
290 'udp_dst_port': self.udp_dst_port,
291 'mac_discovery_gw': self.get_gw_ip(chain_idx),
292 'ip_src_tg_gw': self.tg_gw_ip_block.get_ip(chain_idx),
293 'ip_dst_tg_gw': peer.tg_gw_ip_block.get_ip(chain_idx),
294 'vlan_tag': self.vlans[chain_idx] if self.vlans else None,
296 'vtep_vlan': self.vtep_vlan if self.vtep_vlan else None,
297 'vtep_src_mac': self.mac if self.vxlan is True else None,
298 'vtep_dst_mac': self.vtep_dst_mac if self.vxlan is True else None,
299 'vtep_dst_ip': self.vtep_dst_ip if self.vxlan is True else None,
300 'vtep_src_ip': self.vtep_src_ip if self.vxlan is True else None,
301 'net_vni': self.vnis[chain_idx] if self.vxlan is True else None
303 # after first chain, fall back to the flow count for all other chains
304 cur_chain_flow_count = flows_per_chain
309 """Convert an IP address from string to numeric."""
310 return struct.unpack("!I", socket.inet_aton(addr))[0]
313 def int_to_ip(nvalue):
314 """Convert an IP address from numeric to string."""
315 return socket.inet_ntoa(struct.pack("!I", nvalue))
318 class GeneratorConfig(object):
319 """Represents traffic configuration for currently running traffic profile."""
321 DEFAULT_IP_STEP = '0.0.0.1'
322 DEFAULT_SRC_DST_IP_STEP = '0.0.0.1'
324 def __init__(self, config):
325 """Create a generator config."""
327 # name of the generator profile (normally trex or dummy)
328 # pick the default one if not specified explicitly from cli options
329 if not config.generator_profile:
330 config.generator_profile = config.traffic_generator.default_profile
331 # pick up the profile dict based on the name
332 gen_config = self.__match_generator_profile(config.traffic_generator,
333 config.generator_profile)
334 self.gen_config = gen_config
335 # copy over fields from the dict
336 self.tool = gen_config.tool
337 self.ip = gen_config.ip
338 # overrides on config.cores and config.mbuf_factor
340 self.cores = config.cores
342 self.cores = gen_config.get('cores', 1)
343 self.mbuf_factor = config.mbuf_factor
344 if gen_config.intf_speed:
345 # interface speed is overriden from config
346 self.intf_speed = bitmath.parse_string(gen_config.intf_speed.replace('ps', '')).bits
348 # interface speed is discovered/provided by the traffic generator
350 self.name = gen_config.name
351 self.zmq_pub_port = gen_config.get('zmq_pub_port', 4500)
352 self.zmq_rpc_port = gen_config.get('zmq_rpc_port', 4501)
353 self.limit_memory = gen_config.get('limit_memory', 1024)
354 self.software_mode = gen_config.get('software_mode', False)
355 self.interfaces = gen_config.interfaces
356 if self.interfaces[0].port != 0 or self.interfaces[1].port != 1:
357 raise TrafficClientException('Invalid port order/id in generator_profile.interfaces')
358 if hasattr(gen_config, 'platform'):
359 self.platform = gen_config.platform
360 self.service_chain = config.service_chain
361 self.service_chain_count = config.service_chain_count
362 self.flow_count = config.flow_count
363 self.host_name = gen_config.host_name
365 self.tg_gateway_ip_addrs = gen_config.tg_gateway_ip_addrs
366 self.ip_addrs = gen_config.ip_addrs
367 self.ip_addrs_step = gen_config.ip_addrs_step or self.DEFAULT_SRC_DST_IP_STEP
368 self.tg_gateway_ip_addrs_step = \
369 gen_config.tg_gateway_ip_addrs_step or self.DEFAULT_IP_STEP
370 self.gateway_ip_addrs_step = gen_config.gateway_ip_addrs_step or self.DEFAULT_IP_STEP
371 self.gateway_ips = gen_config.gateway_ip_addrs
372 self.udp_src_port = gen_config.udp_src_port
373 self.udp_dst_port = gen_config.udp_dst_port
374 self.vteps = gen_config.get('vteps')
375 self.devices = [Device(port, self) for port in [0, 1]]
376 # This should normally always be [0, 1]
377 self.ports = [device.port for device in self.devices]
379 # check that pci is not empty
380 if not gen_config.interfaces[0].get('pci', None) or \
381 not gen_config.interfaces[1].get('pci', None):
382 raise TrafficClientException("configuration interfaces pci fields cannot be empty")
384 self.pcis = [tgif['pci'] for tgif in gen_config.interfaces]
385 self.vlan_tagging = config.vlan_tagging
387 # needed for result/summarizer
388 config['tg-name'] = gen_config.name
389 config['tg-tool'] = self.tool
392 """Get json form to display the content into the overall result dict."""
393 return dict(self.gen_config)
395 def set_dest_macs(self, port_index, dest_macs):
396 """Set the list of dest MACs indexed by the chain id on given port.
398 port_index: the port for which dest macs must be set
399 dest_macs: a list of dest MACs indexed by chain id
401 if len(dest_macs) < self.config.service_chain_count:
402 raise TrafficClientException('Dest MAC list %s must have %d entries' %
403 (dest_macs, self.config.service_chain_count))
404 # only pass the first scc dest MACs
405 self.devices[port_index].set_dest_macs(dest_macs[:self.config.service_chain_count])
406 LOG.info('Port %d: dst MAC %s', port_index, [str(mac) for mac in dest_macs])
408 def set_vtep_dest_macs(self, port_index, dest_macs):
409 """Set the list of dest MACs indexed by the chain id on given port.
411 port_index: the port for which dest macs must be set
412 dest_macs: a list of dest MACs indexed by chain id
414 if len(dest_macs) != self.config.service_chain_count:
415 raise TrafficClientException('Dest MAC list %s must have %d entries' %
416 (dest_macs, self.config.service_chain_count))
417 self.devices[port_index].set_vtep_dst_mac(dest_macs)
418 LOG.info('Port %d: vtep dst MAC %s', port_index, set([str(mac) for mac in dest_macs]))
420 def get_dest_macs(self):
421 """Return the list of dest macs indexed by port."""
422 return [dev.get_dest_macs() for dev in self.devices]
424 def set_vlans(self, port_index, vlans):
425 """Set the list of vlans to use indexed by the chain id on given port.
427 port_index: the port for which VLANs must be set
428 vlans: a list of vlan lists indexed by chain id
430 if len(vlans) != self.config.service_chain_count:
431 raise TrafficClientException('VLAN list %s must have %d entries' %
432 (vlans, self.config.service_chain_count))
433 self.devices[port_index].set_vlans(vlans)
435 def set_vxlans(self, port_index, vxlans):
436 """Set the list of vxlans (VNIs) to use indexed by the chain id on given port.
438 port_index: the port for which VXLANs must be set
439 VXLANs: a list of VNIs lists indexed by chain id
441 if len(vxlans) != self.config.service_chain_count:
442 raise TrafficClientException('VXLAN list %s must have %d entries' %
443 (vxlans, self.config.service_chain_count))
444 self.devices[port_index].set_vxlans(vxlans)
446 def set_vtep_vlan(self, port_index, vlan):
447 """Set the vtep vlan to use indexed by the chain id on given port.
448 port_index: the port for which VLAN must be set
450 self.devices[port_index].set_vtep_vlan(vlan)
452 def set_vxlan_endpoints(self, port_index, src_ip, dst_ip):
453 self.devices[port_index].set_vxlan_endpoints(src_ip, dst_ip)
456 def __match_generator_profile(traffic_generator, generator_profile):
457 gen_config = AttrDict(traffic_generator)
458 gen_config.pop('default_profile')
459 gen_config.pop('generator_profile')
460 matching_profile = [profile for profile in traffic_generator.generator_profile if
461 profile.name == generator_profile]
462 if len(matching_profile) != 1:
463 raise Exception('Traffic generator profile not found: ' + generator_profile)
465 gen_config.update(matching_profile[0])
469 class TrafficClient(object):
470 """Traffic generator client with NDR/PDR binary seearch."""
474 def __init__(self, config, notifier=None):
475 """Create a new TrafficClient instance.
477 config: nfvbench config
478 notifier: notifier (optional)
480 A new instance is created everytime the nfvbench config may have changed.
483 self.generator_config = GeneratorConfig(config)
484 self.tool = self.generator_config.tool
485 self.gen = self._get_generator()
486 self.notifier = notifier
487 self.interval_collector = None
488 self.iteration_collector = None
489 self.runner = TrafficRunner(self, self.config.duration_sec, self.config.interval_sec)
490 self.config.frame_sizes = self._get_frame_sizes()
492 'l2frame_size': None,
493 'duration_sec': self.config.duration_sec,
494 'bidirectional': True,
495 'rates': [] # to avoid unsbuscriptable-obj warning
497 self.current_total_rate = {'rate_percent': '10'}
498 if self.config.single_run:
499 self.current_total_rate = utils.parse_rate_str(self.config.rate)
501 # Speed is either discovered when connecting to TG or set from config
502 # This variable is 0 if not yet discovered from TG or must be the speed of
503 # each interface in bits per second
504 self.intf_speed = self.generator_config.intf_speed
506 def _get_generator(self):
507 tool = self.tool.lower()
509 from traffic_gen import trex_gen
510 return trex_gen.TRex(self)
512 from traffic_gen import dummy
513 return dummy.DummyTG(self)
514 raise TrafficClientException('Unsupported generator tool name:' + self.tool)
516 def skip_sleep(self):
517 """Skip all sleeps when doing unit testing with dummy TG.
519 Must be overriden using mock.patch
523 def _get_frame_sizes(self):
524 traffic_profile_name = self.config.traffic.profile
525 matching_profiles = [profile for profile in self.config.traffic_profile if
526 profile.name == traffic_profile_name]
527 if len(matching_profiles) > 1:
528 raise TrafficClientException('Multiple traffic profiles with name: ' +
529 traffic_profile_name)
530 elif not matching_profiles:
531 raise TrafficClientException('Cannot find traffic profile: ' + traffic_profile_name)
532 return matching_profiles[0].l2frame_size
534 def start_traffic_generator(self):
535 """Start the traffic generator process (traffic not started yet)."""
537 # pick up the interface speed if it is not set from config
538 intf_speeds = self.gen.get_port_speed_gbps()
539 # convert Gbps unit into bps
540 tg_if_speed = bitmath.parse_string(str(intf_speeds[0]) + 'Gb').bits
542 # interface speed is overriden from config
543 if self.intf_speed != tg_if_speed:
544 # Warn the user if the speed in the config is different
545 LOG.warning('Interface speed provided is different from actual speed (%d Gbps)',
548 # interface speed not provisioned by config
549 self.intf_speed = tg_if_speed
550 # also update the speed in the tg config
551 self.generator_config.intf_speed = tg_if_speed
553 # Save the traffic generator local MAC
554 for mac, device in zip(self.gen.get_macs(), self.generator_config.devices):
558 """Set up the traffic client."""
559 self.gen.clear_stats()
561 def get_version(self):
562 """Get the traffic generator version."""
563 return self.gen.get_version()
565 def ensure_end_to_end(self):
566 """Ensure traffic generator receives packets it has transmitted.
568 This ensures end to end connectivity and also waits until VMs are ready to forward packets.
570 VMs that are started and in active state may not pass traffic yet. It is imperative to make
571 sure that all VMs are passing traffic in both directions before starting any benchmarking.
572 To verify this, we need to send at a low frequency bi-directional packets and make sure
573 that we receive all packets back from all VMs. The number of flows is equal to 2 times
574 the number of chains (1 per direction) and we need to make sure we receive packets coming
575 from exactly 2 x chain count different source MAC addresses.
578 PVP chain (1 VM per chain)
579 N = 10 (number of chains)
580 Flow count = 20 (number of flows)
581 If the number of unique source MAC addresses from received packets is 20 then
582 all 10 VMs 10 VMs are in operational state.
584 LOG.info('Starting traffic generator to ensure end-to-end connectivity')
585 # send 2pps on each chain and each direction
586 rate_pps = {'rate_pps': str(self.config.service_chain_count * 2)}
587 self.gen.create_traffic('64', [rate_pps, rate_pps], bidirectional=True, latency=False,
589 # ensures enough traffic is coming back
590 retry_count = (self.config.check_traffic_time_sec +
591 self.config.generic_poll_sec - 1) / self.config.generic_poll_sec
593 # we expect to see packets coming from 2 unique MAC per chain
594 # because there can be flooding in the case of shared net
595 # we must verify that packets from the right VMs are received
596 # and not just count unique src MAC
597 # create a dict of (port, chain) tuples indexed by dest mac
599 for port, dest_macs in enumerate(self.generator_config.get_dest_macs()):
600 for chain, mac in enumerate(dest_macs):
601 mac_map[mac] = (port, chain)
602 unique_src_mac_count = len(mac_map)
603 if self.config.vxlan and self.config.traffic_generator.vtep_vlan:
604 get_mac_id = lambda packet: packet['binary'][60:66]
605 elif self.config.vxlan:
606 get_mac_id = lambda packet: packet['binary'][56:62]
608 get_mac_id = lambda packet: packet['binary'][6:12]
609 for it in xrange(retry_count):
610 self.gen.clear_stats()
611 self.gen.start_traffic()
612 self.gen.start_capture()
613 LOG.info('Captured unique src mac %d/%d, capturing return packets (retry %d/%d)...',
614 unique_src_mac_count - len(mac_map), unique_src_mac_count,
616 if not self.skip_sleep():
617 time.sleep(self.config.generic_poll_sec)
618 self.gen.stop_traffic()
619 self.gen.fetch_capture_packets()
620 self.gen.stop_capture()
621 for packet in self.gen.packet_list:
622 mac_id = get_mac_id(packet)
623 src_mac = ':'.join(["%02x" % ord(x) for x in mac_id])
624 if src_mac in mac_map and self.is_udp(packet):
625 port, chain = mac_map[src_mac]
626 LOG.info('Received packet from mac: %s (chain=%d, port=%d)',
627 src_mac, chain, port)
628 mac_map.pop(src_mac, None)
631 LOG.info('End-to-end connectivity established')
633 if self.config.l3_router and not self.config.no_arp:
634 # In case of L3 traffic mode, routers are not able to route traffic
635 # until VM interfaces are up and ARP requests are done
636 LOG.info('Waiting for loopback service completely started...')
637 LOG.info('Sending ARP request to assure end-to-end connectivity established')
638 self.ensure_arp_successful()
639 raise TrafficClientException('End-to-end connectivity cannot be ensured')
641 def is_udp(self, packet):
642 pkt = Ether(packet['binary'])
645 def ensure_arp_successful(self):
646 """Resolve all IP using ARP and throw an exception in case of failure."""
647 dest_macs = self.gen.resolve_arp()
649 # all dest macs are discovered, saved them into the generator config
650 if self.config.vxlan:
651 self.generator_config.set_vtep_dest_macs(0, dest_macs[0])
652 self.generator_config.set_vtep_dest_macs(1, dest_macs[1])
654 self.generator_config.set_dest_macs(0, dest_macs[0])
655 self.generator_config.set_dest_macs(1, dest_macs[1])
657 raise TrafficClientException('ARP cannot be resolved')
659 def set_traffic(self, frame_size, bidirectional):
660 """Reconfigure the traffic generator for a new frame size."""
661 self.run_config['bidirectional'] = bidirectional
662 self.run_config['l2frame_size'] = frame_size
663 self.run_config['rates'] = [self.get_per_direction_rate()]
665 self.run_config['rates'].append(self.get_per_direction_rate())
667 unidir_reverse_pps = int(self.config.unidir_reverse_traffic_pps)
668 if unidir_reverse_pps > 0:
669 self.run_config['rates'].append({'rate_pps': str(unidir_reverse_pps)})
670 # Fix for [NFVBENCH-67], convert the rate string to PPS
671 for idx, rate in enumerate(self.run_config['rates']):
672 if 'rate_pps' not in rate:
673 self.run_config['rates'][idx] = {'rate_pps': self.__convert_rates(rate)['rate_pps']}
675 self.gen.clear_streamblock()
676 if not self.config.vxlan:
677 self.gen.create_traffic(frame_size, self.run_config['rates'], bidirectional,
680 self.gen.create_traffic(frame_size, self.run_config['rates'], bidirectional,
683 def _modify_load(self, load):
684 self.current_total_rate = {'rate_percent': str(load)}
685 rate_per_direction = self.get_per_direction_rate()
687 self.gen.modify_rate(rate_per_direction, False)
688 self.run_config['rates'][0] = rate_per_direction
689 if self.run_config['bidirectional']:
690 self.gen.modify_rate(rate_per_direction, True)
691 self.run_config['rates'][1] = rate_per_direction
693 def get_ndr_and_pdr(self):
694 """Start the NDR/PDR iteration and return the results."""
695 dst = 'Bidirectional' if self.run_config['bidirectional'] else 'Unidirectional'
697 if self.config.ndr_run:
698 LOG.info('*** Searching NDR for %s (%s)...', self.run_config['l2frame_size'], dst)
699 targets['ndr'] = self.config.measurement.NDR
700 if self.config.pdr_run:
701 LOG.info('*** Searching PDR for %s (%s)...', self.run_config['l2frame_size'], dst)
702 targets['pdr'] = self.config.measurement.PDR
704 self.run_config['start_time'] = time.time()
705 self.interval_collector = IntervalCollector(self.run_config['start_time'])
706 self.interval_collector.attach_notifier(self.notifier)
707 self.iteration_collector = IterationCollector(self.run_config['start_time'])
709 self.__range_search(0.0, 200.0, targets, results)
711 results['iteration_stats'] = {
712 'ndr_pdr': self.iteration_collector.get()
715 if self.config.ndr_run:
716 LOG.info('NDR load: %s', results['ndr']['rate_percent'])
717 results['ndr']['time_taken_sec'] = \
718 results['ndr']['timestamp_sec'] - self.run_config['start_time']
719 if self.config.pdr_run:
720 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
721 results['pdr']['time_taken_sec'] = \
722 results['pdr']['timestamp_sec'] - results['ndr']['timestamp_sec']
724 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
725 results['pdr']['time_taken_sec'] = \
726 results['pdr']['timestamp_sec'] - self.run_config['start_time']
729 def __get_dropped_rate(self, result):
730 dropped_pkts = result['rx']['dropped_pkts']
731 total_pkts = result['tx']['total_pkts']
734 return float(dropped_pkts) / total_pkts * 100
737 """Collect final stats for previous run."""
738 stats = self.gen.get_stats()
739 retDict = {'total_tx_rate': stats['total_tx_rate']}
740 for port in self.PORTS:
741 retDict[port] = {'tx': {}, 'rx': {}}
743 tx_keys = ['total_pkts', 'total_pkt_bytes', 'pkt_rate', 'pkt_bit_rate']
744 rx_keys = tx_keys + ['dropped_pkts']
746 for port in self.PORTS:
748 retDict[port]['tx'][key] = int(stats[port]['tx'][key])
751 retDict[port]['rx'][key] = int(stats[port]['rx'][key])
753 retDict[port]['rx'][key] = 0
754 retDict[port]['rx']['avg_delay_usec'] = cast_integer(
755 stats[port]['rx']['avg_delay_usec'])
756 retDict[port]['rx']['min_delay_usec'] = cast_integer(
757 stats[port]['rx']['min_delay_usec'])
758 retDict[port]['rx']['max_delay_usec'] = cast_integer(
759 stats[port]['rx']['max_delay_usec'])
760 retDict[port]['drop_rate_percent'] = self.__get_dropped_rate(retDict[port])
762 ports = sorted(retDict.keys())
763 if self.run_config['bidirectional']:
764 retDict['overall'] = {'tx': {}, 'rx': {}}
766 retDict['overall']['tx'][key] = \
767 retDict[ports[0]]['tx'][key] + retDict[ports[1]]['tx'][key]
769 retDict['overall']['rx'][key] = \
770 retDict[ports[0]]['rx'][key] + retDict[ports[1]]['rx'][key]
771 total_pkts = [retDict[ports[0]]['rx']['total_pkts'],
772 retDict[ports[1]]['rx']['total_pkts']]
773 avg_delays = [retDict[ports[0]]['rx']['avg_delay_usec'],
774 retDict[ports[1]]['rx']['avg_delay_usec']]
775 max_delays = [retDict[ports[0]]['rx']['max_delay_usec'],
776 retDict[ports[1]]['rx']['max_delay_usec']]
777 min_delays = [retDict[ports[0]]['rx']['min_delay_usec'],
778 retDict[ports[1]]['rx']['min_delay_usec']]
779 retDict['overall']['rx']['avg_delay_usec'] = utils.weighted_avg(total_pkts, avg_delays)
780 retDict['overall']['rx']['min_delay_usec'] = min(min_delays)
781 retDict['overall']['rx']['max_delay_usec'] = max(max_delays)
782 for key in ['pkt_bit_rate', 'pkt_rate']:
783 for dirc in ['tx', 'rx']:
784 retDict['overall'][dirc][key] /= 2.0
786 retDict['overall'] = retDict[ports[0]]
787 retDict['overall']['drop_rate_percent'] = self.__get_dropped_rate(retDict['overall'])
790 def __convert_rates(self, rate):
791 return utils.convert_rates(self.run_config['l2frame_size'],
795 def __ndr_pdr_found(self, tag, load):
796 rates = self.__convert_rates({'rate_percent': load})
797 self.iteration_collector.add_ndr_pdr(tag, rates['rate_pps'])
798 last_stats = self.iteration_collector.peek()
799 self.interval_collector.add_ndr_pdr(tag, last_stats)
801 def __format_output_stats(self, stats):
802 for key in self.PORTS + ['overall']:
803 interface = stats[key]
805 'tx_pkts': interface['tx']['total_pkts'],
806 'rx_pkts': interface['rx']['total_pkts'],
807 'drop_percentage': interface['drop_rate_percent'],
808 'drop_pct': interface['rx']['dropped_pkts'],
809 'avg_delay_usec': interface['rx']['avg_delay_usec'],
810 'max_delay_usec': interface['rx']['max_delay_usec'],
811 'min_delay_usec': interface['rx']['min_delay_usec'],
816 def __targets_found(self, rate, targets, results):
817 for tag, target in targets.iteritems():
818 LOG.info('Found %s (%s) load: %s', tag, target, rate)
819 self.__ndr_pdr_found(tag, rate)
820 results[tag]['timestamp_sec'] = time.time()
822 def __range_search(self, left, right, targets, results):
823 """Perform a binary search for a list of targets inside a [left..right] range or rate.
825 left the left side of the range to search as a % the line rate (100 = 100% line rate)
826 indicating the rate to send on each interface
827 right the right side of the range to search as a % of line rate
828 indicating the rate to send on each interface
829 targets a dict of drop rates to search (0.1 = 0.1%), indexed by the DR name or "tag"
831 results a dict to store results
835 LOG.info('Range search [%s .. %s] targets: %s', left, right, targets)
837 # Terminate search when gap is less than load epsilon
838 if right - left < self.config.measurement.load_epsilon:
839 self.__targets_found(left, targets, results)
842 # Obtain the average drop rate in for middle load
843 middle = (left + right) / 2.0
845 stats, rates = self.__run_search_iteration(middle)
847 LOG.exception("Got exception from traffic generator during binary search")
848 self.__targets_found(left, targets, results)
850 # Split target dicts based on the avg drop rate
853 for tag, target in targets.iteritems():
854 if stats['overall']['drop_rate_percent'] <= target:
855 # record the best possible rate found for this target
857 results[tag].update({
858 'load_percent_per_direction': middle,
859 'stats': self.__format_output_stats(dict(stats)),
860 'timestamp_sec': None
862 right_targets[tag] = target
864 # initialize to 0 all fields of result for
865 # the worst case scenario of the binary search (if ndr/pdr is not found)
866 if tag not in results:
867 results[tag] = dict.fromkeys(rates, 0)
868 empty_stats = self.__format_output_stats(dict(stats))
869 for key in empty_stats:
870 if isinstance(empty_stats[key], dict):
871 empty_stats[key] = dict.fromkeys(empty_stats[key], 0)
874 results[tag].update({
875 'load_percent_per_direction': 0,
876 'stats': empty_stats,
877 'timestamp_sec': None
879 left_targets[tag] = target
882 self.__range_search(left, middle, left_targets, results)
884 # search upper half only if the upper rate does not exceed
885 # 100%, this only happens when the first search at 100%
886 # yields a DR that is < target DR
888 self.__targets_found(100, right_targets, results)
890 self.__range_search(middle, right, right_targets, results)
892 def __run_search_iteration(self, rate):
893 """Run one iteration at the given rate level.
895 rate: the rate to send on each port in percent (0 to 100)
897 self._modify_load(rate)
899 # poll interval stats and collect them
900 for stats in self.run_traffic():
901 self.interval_collector.add(stats)
902 time_elapsed_ratio = self.runner.time_elapsed() / self.run_config['duration_sec']
903 if time_elapsed_ratio >= 1:
904 self.cancel_traffic()
905 if not self.skip_sleep():
906 time.sleep(self.config.pause_sec)
907 self.interval_collector.reset()
909 # get stats from the run
910 stats = self.runner.client.get_stats()
911 current_traffic_config = self._get_traffic_config()
912 warning = self.compare_tx_rates(current_traffic_config['direction-total']['rate_pps'],
913 stats['total_tx_rate'])
914 if warning is not None:
915 stats['warning'] = warning
917 # save reliable stats from whole iteration
918 self.iteration_collector.add(stats, current_traffic_config['direction-total']['rate_pps'])
919 LOG.info('Average drop rate: %f', stats['overall']['drop_rate_percent'])
920 return stats, current_traffic_config['direction-total']
923 def log_stats(stats):
924 """Log estimated stats during run."""
926 'datetime': str(datetime.now()),
927 'tx_packets': stats['overall']['tx']['total_pkts'],
928 'rx_packets': stats['overall']['rx']['total_pkts'],
929 'drop_packets': stats['overall']['rx']['dropped_pkts'],
930 'drop_rate_percent': stats['overall']['drop_rate_percent']
932 LOG.info('TX: %(tx_packets)d; '
933 'RX: %(rx_packets)d; '
934 'Est. Dropped: %(drop_packets)d; '
935 'Est. Drop rate: %(drop_rate_percent).4f%%',
938 def run_traffic(self):
939 """Start traffic and return intermediate stats for each interval."""
940 stats = self.runner.run()
941 while self.runner.is_running:
942 self.log_stats(stats)
944 stats = self.runner.poll_stats()
947 self.log_stats(stats)
948 LOG.info('Drop rate: %f', stats['overall']['drop_rate_percent'])
951 def cancel_traffic(self):
955 def _get_traffic_config(self):
960 for idx, rate in enumerate(self.run_config['rates']):
961 key = 'direction-forward' if idx == 0 else 'direction-reverse'
963 'l2frame_size': self.run_config['l2frame_size'],
964 'duration_sec': self.run_config['duration_sec']
966 config[key].update(rate)
967 config[key].update(self.__convert_rates(rate))
968 load_total += float(config[key]['rate_percent'])
969 bps_total += float(config[key]['rate_bps'])
970 pps_total += float(config[key]['rate_pps'])
971 config['direction-total'] = dict(config['direction-forward'])
972 config['direction-total'].update({
973 'rate_percent': load_total,
974 'rate_pps': cast_integer(pps_total),
975 'rate_bps': bps_total
980 def get_run_config(self, results):
981 """Return configuration which was used for the last run."""
983 # because we want each direction to have the far end RX rates,
984 # use the far end index (1-idx) to retrieve the RX rates
985 for idx, key in enumerate(["direction-forward", "direction-reverse"]):
986 tx_rate = results["stats"][idx]["tx"]["total_pkts"] / self.config.duration_sec
987 rx_rate = results["stats"][1 - idx]["rx"]["total_pkts"] / self.config.duration_sec
989 "orig": self.__convert_rates(self.run_config['rates'][idx]),
990 "tx": self.__convert_rates({'rate_pps': tx_rate}),
991 "rx": self.__convert_rates({'rate_pps': rx_rate})
995 for direction in ['orig', 'tx', 'rx']:
996 total[direction] = {}
997 for unit in ['rate_percent', 'rate_bps', 'rate_pps']:
998 total[direction][unit] = sum([float(x[direction][unit]) for x in r.values()])
1000 r['direction-total'] = total
1003 def insert_interface_stats(self, pps_list):
1004 """Insert interface stats to a list of packet path stats.
1006 pps_list: a list of packet path stats instances indexed by chain index
1008 This function will insert the packet path stats for the traffic gen ports 0 and 1
1009 with itemized per chain tx/rx counters.
1010 There will be as many packet path stats as chains.
1011 Each packet path stats will have exactly 2 InterfaceStats for port 0 and port 1
1014 PacketPathStats(InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)),
1015 PacketPathStats(InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)),
1019 def get_if_stats(chain_idx):
1020 return [InterfaceStats('p' + str(port), self.tool)
1021 for port in range(2)]
1022 # keep the list of list of interface stats indexed by the chain id
1023 self.ifstats = [get_if_stats(chain_idx)
1024 for chain_idx in range(self.config.service_chain_count)]
1025 # note that we need to make a copy of the ifs list so that any modification in the
1026 # list from pps will not change the list saved in self.ifstats
1027 self.pps_list = [PacketPathStats(list(ifs)) for ifs in self.ifstats]
1028 # insert the corresponding pps in the passed list
1029 pps_list.extend(self.pps_list)
1031 def update_interface_stats(self, diff=False):
1032 """Update all interface stats.
1034 diff: if False, simply refresh the interface stats values with latest values
1035 if True, diff the interface stats with the latest values
1036 Make sure that the interface stats inserted in insert_interface_stats() are updated
1040 [InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)],
1041 [InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)],
1046 stats = self.gen.get_stats()
1047 for chain_idx, ifs in enumerate(self.ifstats):
1048 # each ifs has exactly 2 InterfaceStats and 2 Latency instances
1049 # corresponding to the
1050 # port 0 and port 1 for the given chain_idx
1051 # Note that we cannot use self.pps_list[chain_idx].if_stats to pick the
1052 # interface stats for the pps because it could have been modified to contain
1053 # additional interface stats
1054 self.gen.get_stream_stats(stats, ifs, self.pps_list[chain_idx].latencies, chain_idx)
1055 # special handling for vxlan
1056 # in case of vxlan, flow stats are not available so all rx counters will be
1057 # zeros when the total rx port counter is non zero.
1059 for port in range(2):
1061 for ifs in self.ifstats:
1062 total_rx += ifs[port].rx
1064 # check if the total port rx from Trex is also zero
1065 port_rx = stats[port]['rx']['total_pkts']
1067 # the total rx for all chains from port level stats is non zero
1068 # which means that the per-chain stats are not available
1069 if len(self.ifstats) == 1:
1070 # only one chain, simply report the port level rx to the chain rx stats
1071 self.ifstats[0][port].rx = port_rx
1073 for ifs in self.ifstats:
1074 # mark this data as unavailable
1076 # pitch in the total rx only in the last chain pps
1077 self.ifstats[-1][port].rx_total = port_rx
1080 def compare_tx_rates(required, actual):
1081 """Compare the actual TX rate to the required TX rate."""
1083 are_different = False
1085 if float(actual) / required < threshold:
1086 are_different = True
1087 except ZeroDivisionError:
1088 are_different = True
1091 msg = "WARNING: There is a significant difference between requested TX rate ({r}) " \
1092 "and actual TX rate ({a}). The traffic generator may not have sufficient CPU " \
1093 "to achieve the requested TX rate.".format(r=required, a=actual)
1099 def get_per_direction_rate(self):
1100 """Get the rate for each direction."""
1101 divisor = 2 if self.run_config['bidirectional'] else 1
1102 if 'rate_percent' in self.current_total_rate:
1103 # don't split rate if it's percentage
1106 return utils.divide_rate(self.current_total_rate, divisor)
1109 """Close this instance."""
1111 self.gen.stop_traffic()
1114 self.gen.clear_stats()