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 self.cores = gen_config.get('cores', 1)
332 if gen_config.intf_speed:
333 # interface speed is overriden from config
334 self.intf_speed = bitmath.parse_string(gen_config.intf_speed.replace('ps', '')).bits
336 # interface speed is discovered/provided by the traffic generator
338 self.software_mode = gen_config.get('software_mode', False)
339 self.interfaces = gen_config.interfaces
340 if self.interfaces[0].port != 0 or self.interfaces[1].port != 1:
341 raise TrafficClientException('Invalid port order/id in generator_profile.interfaces')
343 self.service_chain = config.service_chain
344 self.service_chain_count = config.service_chain_count
345 self.flow_count = config.flow_count
346 self.host_name = gen_config.host_name
348 self.tg_gateway_ip_addrs = gen_config.tg_gateway_ip_addrs
349 self.ip_addrs = gen_config.ip_addrs
350 self.ip_addrs_step = gen_config.ip_addrs_step or self.DEFAULT_SRC_DST_IP_STEP
351 self.tg_gateway_ip_addrs_step = \
352 gen_config.tg_gateway_ip_addrs_step or self.DEFAULT_IP_STEP
353 self.gateway_ip_addrs_step = gen_config.gateway_ip_addrs_step or self.DEFAULT_IP_STEP
354 self.gateway_ips = gen_config.gateway_ip_addrs
355 self.udp_src_port = gen_config.udp_src_port
356 self.udp_dst_port = gen_config.udp_dst_port
357 self.vteps = gen_config.get('vteps')
358 self.vnis = gen_config.get('vnis')
359 self.devices = [Device(port, self) for port in [0, 1]]
360 # This should normally always be [0, 1]
361 self.ports = [device.port for device in self.devices]
363 # check that pci is not empty
364 if not gen_config.interfaces[0].get('pci', None) or \
365 not gen_config.interfaces[1].get('pci', None):
366 raise TrafficClientException("configuration interfaces pci fields cannot be empty")
368 self.pcis = [tgif['pci'] for tgif in gen_config.interfaces]
369 self.vlan_tagging = config.vlan_tagging
371 # needed for result/summarizer
372 config['tg-name'] = gen_config.name
373 config['tg-tool'] = self.tool
376 """Get json form to display the content into the overall result dict."""
377 return dict(self.gen_config)
379 def set_dest_macs(self, port_index, dest_macs):
380 """Set the list of dest MACs indexed by the chain id on given port.
382 port_index: the port for which dest macs must be set
383 dest_macs: a list of dest MACs indexed by chain id
385 if len(dest_macs) != self.config.service_chain_count:
386 raise TrafficClientException('Dest MAC list %s must have %d entries' %
387 (dest_macs, self.config.service_chain_count))
388 self.devices[port_index].set_dest_macs(dest_macs)
389 LOG.info('Port %d: dst MAC %s', port_index, [str(mac) for mac in dest_macs])
391 def set_vtep_dest_macs(self, port_index, dest_macs):
392 """Set the list of dest MACs indexed by the chain id on given port.
394 port_index: the port for which dest macs must be set
395 dest_macs: a list of dest MACs indexed by chain id
397 if len(dest_macs) != self.config.service_chain_count:
398 raise TrafficClientException('Dest MAC list %s must have %d entries' %
399 (dest_macs, self.config.service_chain_count))
400 self.devices[port_index].set_vtep_dst_mac(dest_macs)
401 LOG.info('Port %d: vtep dst MAC %s', port_index, set([str(mac) for mac in dest_macs]))
403 def get_dest_macs(self):
404 """Return the list of dest macs indexed by port."""
405 return [dev.get_dest_macs() for dev in self.devices]
407 def set_vlans(self, port_index, vlans):
408 """Set the list of vlans to use indexed by the chain id on given port.
410 port_index: the port for which VLANs must be set
411 vlans: a list of vlan lists indexed by chain id
413 if len(vlans) != self.config.service_chain_count:
414 raise TrafficClientException('VLAN list %s must have %d entries' %
415 (vlans, self.config.service_chain_count))
416 self.devices[port_index].set_vlans(vlans)
418 def set_vxlans(self, port_index, vxlans):
419 """Set the list of vxlans (VNIs) to use indexed by the chain id on given port.
421 port_index: the port for which VXLANs must be set
422 VXLANs: a list of VNIs lists indexed by chain id
424 if len(vxlans) != self.config.service_chain_count:
425 raise TrafficClientException('VXLAN list %s must have %d entries' %
426 (vxlans, self.config.service_chain_count))
427 self.devices[port_index].set_vxlans(vxlans)
429 def set_vtep_vlan(self, port_index, vlan):
430 """Set the vtep vlan to use indexed by the chain id on given port.
431 port_index: the port for which VLAN must be set
433 self.devices[port_index].set_vtep_vlan(vlan)
435 def set_vxlan_endpoints(self, port_index, src_ip, dst_ip):
436 self.devices[port_index].set_vxlan_endpoints(src_ip, dst_ip)
439 def __match_generator_profile(traffic_generator, generator_profile):
440 gen_config = AttrDict(traffic_generator)
441 gen_config.pop('default_profile')
442 gen_config.pop('generator_profile')
443 matching_profile = [profile for profile in traffic_generator.generator_profile if
444 profile.name == generator_profile]
445 if len(matching_profile) != 1:
446 raise Exception('Traffic generator profile not found: ' + generator_profile)
448 gen_config.update(matching_profile[0])
452 class TrafficClient(object):
453 """Traffic generator client with NDR/PDR binary seearch."""
457 def __init__(self, config, notifier=None):
458 """Create a new TrafficClient instance.
460 config: nfvbench config
461 notifier: notifier (optional)
463 A new instance is created everytime the nfvbench config may have changed.
466 self.generator_config = GeneratorConfig(config)
467 self.tool = self.generator_config.tool
468 self.gen = self._get_generator()
469 self.notifier = notifier
470 self.interval_collector = None
471 self.iteration_collector = None
472 self.runner = TrafficRunner(self, self.config.duration_sec, self.config.interval_sec)
473 self.config.frame_sizes = self._get_frame_sizes()
475 'l2frame_size': None,
476 'duration_sec': self.config.duration_sec,
477 'bidirectional': True,
478 'rates': [] # to avoid unsbuscriptable-obj warning
480 self.current_total_rate = {'rate_percent': '10'}
481 if self.config.single_run:
482 self.current_total_rate = utils.parse_rate_str(self.config.rate)
484 # Speed is either discovered when connecting to TG or set from config
485 # This variable is 0 if not yet discovered from TG or must be the speed of
486 # each interface in bits per second
487 self.intf_speed = self.generator_config.intf_speed
489 def _get_generator(self):
490 tool = self.tool.lower()
492 from traffic_gen import trex
493 return trex.TRex(self)
495 from traffic_gen import dummy
496 return dummy.DummyTG(self)
497 raise TrafficClientException('Unsupported generator tool name:' + self.tool)
499 def skip_sleep(self):
500 """Skip all sleeps when doing unit testing with dummy TG.
502 Must be overriden using mock.patch
506 def _get_frame_sizes(self):
507 traffic_profile_name = self.config.traffic.profile
508 matching_profiles = [profile for profile in self.config.traffic_profile if
509 profile.name == traffic_profile_name]
510 if len(matching_profiles) > 1:
511 raise TrafficClientException('Multiple traffic profiles with name: ' +
512 traffic_profile_name)
513 elif not matching_profiles:
514 raise TrafficClientException('Cannot find traffic profile: ' + traffic_profile_name)
515 return matching_profiles[0].l2frame_size
517 def start_traffic_generator(self):
518 """Start the traffic generator process (traffic not started yet)."""
520 # pick up the interface speed if it is not set from config
521 intf_speeds = self.gen.get_port_speed_gbps()
522 # convert Gbps unit into bps
523 tg_if_speed = bitmath.parse_string(str(intf_speeds[0]) + 'Gb').bits
525 # interface speed is overriden from config
526 if self.intf_speed != tg_if_speed:
527 # Warn the user if the speed in the config is different
528 LOG.warning('Interface speed provided is different from actual speed (%d Gbps)',
531 # interface speed not provisioned by config
532 self.intf_speed = tg_if_speed
533 # also update the speed in the tg config
534 self.generator_config.intf_speed = tg_if_speed
536 # Save the traffic generator local MAC
537 for mac, device in zip(self.gen.get_macs(), self.generator_config.devices):
541 """Set up the traffic client."""
542 self.gen.clear_stats()
544 def get_version(self):
545 """Get the traffic generator version."""
546 return self.gen.get_version()
548 def ensure_end_to_end(self):
549 """Ensure traffic generator receives packets it has transmitted.
551 This ensures end to end connectivity and also waits until VMs are ready to forward packets.
553 VMs that are started and in active state may not pass traffic yet. It is imperative to make
554 sure that all VMs are passing traffic in both directions before starting any benchmarking.
555 To verify this, we need to send at a low frequency bi-directional packets and make sure
556 that we receive all packets back from all VMs. The number of flows is equal to 2 times
557 the number of chains (1 per direction) and we need to make sure we receive packets coming
558 from exactly 2 x chain count different source MAC addresses.
561 PVP chain (1 VM per chain)
562 N = 10 (number of chains)
563 Flow count = 20 (number of flows)
564 If the number of unique source MAC addresses from received packets is 20 then
565 all 10 VMs 10 VMs are in operational state.
567 LOG.info('Starting traffic generator to ensure end-to-end connectivity')
568 # send 2pps on each chain and each direction
569 rate_pps = {'rate_pps': str(self.config.service_chain_count * 2)}
570 self.gen.create_traffic('64', [rate_pps, rate_pps], bidirectional=True, latency=False)
572 # ensures enough traffic is coming back
573 retry_count = (self.config.check_traffic_time_sec +
574 self.config.generic_poll_sec - 1) / self.config.generic_poll_sec
576 # we expect to see packets coming from 2 unique MAC per chain
577 # because there can be flooding in the case of shared net
578 # we must verify that packets from the right VMs are received
579 # and not just count unique src MAC
580 # create a dict of (port, chain) tuples indexed by dest mac
582 for port, dest_macs in enumerate(self.generator_config.get_dest_macs()):
583 for chain, mac in enumerate(dest_macs):
584 mac_map[mac] = (port, chain)
585 unique_src_mac_count = len(mac_map)
586 if self.config.vxlan and self.config.traffic_generator.vtep_vlan:
587 get_mac_id = lambda packet: packet['binary'][60:66]
588 elif self.config.vxlan:
589 get_mac_id = lambda packet: packet['binary'][56:62]
591 get_mac_id = lambda packet: packet['binary'][6:12]
592 for it in xrange(retry_count):
593 self.gen.clear_stats()
594 self.gen.start_traffic()
595 self.gen.start_capture()
596 LOG.info('Captured unique src mac %d/%d, capturing return packets (retry %d/%d)...',
597 unique_src_mac_count - len(mac_map), unique_src_mac_count,
599 if not self.skip_sleep():
600 time.sleep(self.config.generic_poll_sec)
601 self.gen.stop_traffic()
602 self.gen.fetch_capture_packets()
603 self.gen.stop_capture()
605 for packet in self.gen.packet_list:
606 mac_id = get_mac_id(packet)
607 src_mac = ':'.join(["%02x" % ord(x) for x in mac_id])
608 if src_mac in mac_map:
609 port, chain = mac_map[src_mac]
610 LOG.info('Received packet from mac: %s (chain=%d, port=%d)',
611 src_mac, chain, port)
612 mac_map.pop(src_mac, None)
615 LOG.info('End-to-end connectivity established')
618 raise TrafficClientException('End-to-end connectivity cannot be ensured')
620 def ensure_arp_successful(self):
621 """Resolve all IP using ARP and throw an exception in case of failure."""
622 dest_macs = self.gen.resolve_arp()
624 # all dest macs are discovered, saved them into the generator config
625 if self.config.vxlan:
626 self.generator_config.set_vtep_dest_macs(0, dest_macs[0])
627 self.generator_config.set_vtep_dest_macs(1, dest_macs[1])
629 self.generator_config.set_dest_macs(0, dest_macs[0])
630 self.generator_config.set_dest_macs(1, dest_macs[1])
632 raise TrafficClientException('ARP cannot be resolved')
634 def set_traffic(self, frame_size, bidirectional):
635 """Reconfigure the traffic generator for a new frame size."""
636 self.run_config['bidirectional'] = bidirectional
637 self.run_config['l2frame_size'] = frame_size
638 self.run_config['rates'] = [self.get_per_direction_rate()]
640 self.run_config['rates'].append(self.get_per_direction_rate())
642 unidir_reverse_pps = int(self.config.unidir_reverse_traffic_pps)
643 if unidir_reverse_pps > 0:
644 self.run_config['rates'].append({'rate_pps': str(unidir_reverse_pps)})
645 # Fix for [NFVBENCH-67], convert the rate string to PPS
646 for idx, rate in enumerate(self.run_config['rates']):
647 if 'rate_pps' not in rate:
648 self.run_config['rates'][idx] = {'rate_pps': self.__convert_rates(rate)['rate_pps']}
650 self.gen.clear_streamblock()
651 self.gen.create_traffic(frame_size, self.run_config['rates'], bidirectional, latency=True)
653 def _modify_load(self, load):
654 self.current_total_rate = {'rate_percent': str(load)}
655 rate_per_direction = self.get_per_direction_rate()
657 self.gen.modify_rate(rate_per_direction, False)
658 self.run_config['rates'][0] = rate_per_direction
659 if self.run_config['bidirectional']:
660 self.gen.modify_rate(rate_per_direction, True)
661 self.run_config['rates'][1] = rate_per_direction
663 def get_ndr_and_pdr(self):
664 """Start the NDR/PDR iteration and return the results."""
665 dst = 'Bidirectional' if self.run_config['bidirectional'] else 'Unidirectional'
667 if self.config.ndr_run:
668 LOG.info('*** Searching NDR for %s (%s)...', self.run_config['l2frame_size'], dst)
669 targets['ndr'] = self.config.measurement.NDR
670 if self.config.pdr_run:
671 LOG.info('*** Searching PDR for %s (%s)...', self.run_config['l2frame_size'], dst)
672 targets['pdr'] = self.config.measurement.PDR
674 self.run_config['start_time'] = time.time()
675 self.interval_collector = IntervalCollector(self.run_config['start_time'])
676 self.interval_collector.attach_notifier(self.notifier)
677 self.iteration_collector = IterationCollector(self.run_config['start_time'])
679 self.__range_search(0.0, 200.0, targets, results)
681 results['iteration_stats'] = {
682 'ndr_pdr': self.iteration_collector.get()
685 if self.config.ndr_run:
686 LOG.info('NDR load: %s', results['ndr']['rate_percent'])
687 results['ndr']['time_taken_sec'] = \
688 results['ndr']['timestamp_sec'] - self.run_config['start_time']
689 if self.config.pdr_run:
690 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
691 results['pdr']['time_taken_sec'] = \
692 results['pdr']['timestamp_sec'] - results['ndr']['timestamp_sec']
694 LOG.info('PDR load: %s', results['pdr']['rate_percent'])
695 results['pdr']['time_taken_sec'] = \
696 results['pdr']['timestamp_sec'] - self.run_config['start_time']
699 def __get_dropped_rate(self, result):
700 dropped_pkts = result['rx']['dropped_pkts']
701 total_pkts = result['tx']['total_pkts']
704 return float(dropped_pkts) / total_pkts * 100
707 """Collect final stats for previous run."""
708 stats = self.gen.get_stats()
709 retDict = {'total_tx_rate': stats['total_tx_rate']}
710 for port in self.PORTS:
711 retDict[port] = {'tx': {}, 'rx': {}}
713 tx_keys = ['total_pkts', 'total_pkt_bytes', 'pkt_rate', 'pkt_bit_rate']
714 rx_keys = tx_keys + ['dropped_pkts']
716 for port in self.PORTS:
718 retDict[port]['tx'][key] = int(stats[port]['tx'][key])
721 retDict[port]['rx'][key] = int(stats[port]['rx'][key])
723 retDict[port]['rx'][key] = 0
724 retDict[port]['rx']['avg_delay_usec'] = cast_integer(
725 stats[port]['rx']['avg_delay_usec'])
726 retDict[port]['rx']['min_delay_usec'] = cast_integer(
727 stats[port]['rx']['min_delay_usec'])
728 retDict[port]['rx']['max_delay_usec'] = cast_integer(
729 stats[port]['rx']['max_delay_usec'])
730 retDict[port]['drop_rate_percent'] = self.__get_dropped_rate(retDict[port])
732 ports = sorted(retDict.keys())
733 if self.run_config['bidirectional']:
734 retDict['overall'] = {'tx': {}, 'rx': {}}
736 retDict['overall']['tx'][key] = \
737 retDict[ports[0]]['tx'][key] + retDict[ports[1]]['tx'][key]
739 retDict['overall']['rx'][key] = \
740 retDict[ports[0]]['rx'][key] + retDict[ports[1]]['rx'][key]
741 total_pkts = [retDict[ports[0]]['rx']['total_pkts'],
742 retDict[ports[1]]['rx']['total_pkts']]
743 avg_delays = [retDict[ports[0]]['rx']['avg_delay_usec'],
744 retDict[ports[1]]['rx']['avg_delay_usec']]
745 max_delays = [retDict[ports[0]]['rx']['max_delay_usec'],
746 retDict[ports[1]]['rx']['max_delay_usec']]
747 min_delays = [retDict[ports[0]]['rx']['min_delay_usec'],
748 retDict[ports[1]]['rx']['min_delay_usec']]
749 retDict['overall']['rx']['avg_delay_usec'] = utils.weighted_avg(total_pkts, avg_delays)
750 retDict['overall']['rx']['min_delay_usec'] = min(min_delays)
751 retDict['overall']['rx']['max_delay_usec'] = max(max_delays)
752 for key in ['pkt_bit_rate', 'pkt_rate']:
753 for dirc in ['tx', 'rx']:
754 retDict['overall'][dirc][key] /= 2.0
756 retDict['overall'] = retDict[ports[0]]
757 retDict['overall']['drop_rate_percent'] = self.__get_dropped_rate(retDict['overall'])
760 def __convert_rates(self, rate):
761 return utils.convert_rates(self.run_config['l2frame_size'],
765 def __ndr_pdr_found(self, tag, load):
766 rates = self.__convert_rates({'rate_percent': load})
767 self.iteration_collector.add_ndr_pdr(tag, rates['rate_pps'])
768 last_stats = self.iteration_collector.peek()
769 self.interval_collector.add_ndr_pdr(tag, last_stats)
771 def __format_output_stats(self, stats):
772 for key in self.PORTS + ['overall']:
773 interface = stats[key]
775 'tx_pkts': interface['tx']['total_pkts'],
776 'rx_pkts': interface['rx']['total_pkts'],
777 'drop_percentage': interface['drop_rate_percent'],
778 'drop_pct': interface['rx']['dropped_pkts'],
779 'avg_delay_usec': interface['rx']['avg_delay_usec'],
780 'max_delay_usec': interface['rx']['max_delay_usec'],
781 'min_delay_usec': interface['rx']['min_delay_usec'],
786 def __targets_found(self, rate, targets, results):
787 for tag, target in targets.iteritems():
788 LOG.info('Found %s (%s) load: %s', tag, target, rate)
789 self.__ndr_pdr_found(tag, rate)
790 results[tag]['timestamp_sec'] = time.time()
792 def __range_search(self, left, right, targets, results):
793 """Perform a binary search for a list of targets inside a [left..right] range or rate.
795 left the left side of the range to search as a % the line rate (100 = 100% line rate)
796 indicating the rate to send on each interface
797 right the right side of the range to search as a % of line rate
798 indicating the rate to send on each interface
799 targets a dict of drop rates to search (0.1 = 0.1%), indexed by the DR name or "tag"
801 results a dict to store results
805 LOG.info('Range search [%s .. %s] targets: %s', left, right, targets)
807 # Terminate search when gap is less than load epsilon
808 if right - left < self.config.measurement.load_epsilon:
809 self.__targets_found(left, targets, results)
812 # Obtain the average drop rate in for middle load
813 middle = (left + right) / 2.0
815 stats, rates = self.__run_search_iteration(middle)
817 LOG.exception("Got exception from traffic generator during binary search")
818 self.__targets_found(left, targets, results)
820 # Split target dicts based on the avg drop rate
823 for tag, target in targets.iteritems():
824 if stats['overall']['drop_rate_percent'] <= target:
825 # record the best possible rate found for this target
827 results[tag].update({
828 'load_percent_per_direction': middle,
829 'stats': self.__format_output_stats(dict(stats)),
830 'timestamp_sec': None
832 right_targets[tag] = target
834 # initialize to 0 all fields of result for
835 # the worst case scenario of the binary search (if ndr/pdr is not found)
836 if tag not in results:
837 results[tag] = dict.fromkeys(rates, 0)
838 empty_stats = self.__format_output_stats(dict(stats))
839 for key in empty_stats:
840 if isinstance(empty_stats[key], dict):
841 empty_stats[key] = dict.fromkeys(empty_stats[key], 0)
844 results[tag].update({
845 'load_percent_per_direction': 0,
846 'stats': empty_stats,
847 'timestamp_sec': None
849 left_targets[tag] = target
852 self.__range_search(left, middle, left_targets, results)
854 # search upper half only if the upper rate does not exceed
855 # 100%, this only happens when the first search at 100%
856 # yields a DR that is < target DR
858 self.__targets_found(100, right_targets, results)
860 self.__range_search(middle, right, right_targets, results)
862 def __run_search_iteration(self, rate):
863 """Run one iteration at the given rate level.
865 rate: the rate to send on each port in percent (0 to 100)
867 self._modify_load(rate)
869 # poll interval stats and collect them
870 for stats in self.run_traffic():
871 self.interval_collector.add(stats)
872 time_elapsed_ratio = self.runner.time_elapsed() / self.run_config['duration_sec']
873 if time_elapsed_ratio >= 1:
874 self.cancel_traffic()
875 if not self.skip_sleep():
876 time.sleep(self.config.pause_sec)
877 self.interval_collector.reset()
879 # get stats from the run
880 stats = self.runner.client.get_stats()
881 current_traffic_config = self._get_traffic_config()
882 warning = self.compare_tx_rates(current_traffic_config['direction-total']['rate_pps'],
883 stats['total_tx_rate'])
884 if warning is not None:
885 stats['warning'] = warning
887 # save reliable stats from whole iteration
888 self.iteration_collector.add(stats, current_traffic_config['direction-total']['rate_pps'])
889 LOG.info('Average drop rate: %f', stats['overall']['drop_rate_percent'])
890 return stats, current_traffic_config['direction-total']
893 def log_stats(stats):
894 """Log estimated stats during run."""
896 'datetime': str(datetime.now()),
897 'tx_packets': stats['overall']['tx']['total_pkts'],
898 'rx_packets': stats['overall']['rx']['total_pkts'],
899 'drop_packets': stats['overall']['rx']['dropped_pkts'],
900 'drop_rate_percent': stats['overall']['drop_rate_percent']
902 LOG.info('TX: %(tx_packets)d; '
903 'RX: %(rx_packets)d; '
904 'Est. Dropped: %(drop_packets)d; '
905 'Est. Drop rate: %(drop_rate_percent).4f%%',
908 def run_traffic(self):
909 """Start traffic and return intermediate stats for each interval."""
910 stats = self.runner.run()
911 while self.runner.is_running:
912 self.log_stats(stats)
914 stats = self.runner.poll_stats()
917 self.log_stats(stats)
918 LOG.info('Drop rate: %f', stats['overall']['drop_rate_percent'])
921 def cancel_traffic(self):
925 def _get_traffic_config(self):
930 for idx, rate in enumerate(self.run_config['rates']):
931 key = 'direction-forward' if idx == 0 else 'direction-reverse'
933 'l2frame_size': self.run_config['l2frame_size'],
934 'duration_sec': self.run_config['duration_sec']
936 config[key].update(rate)
937 config[key].update(self.__convert_rates(rate))
938 load_total += float(config[key]['rate_percent'])
939 bps_total += float(config[key]['rate_bps'])
940 pps_total += float(config[key]['rate_pps'])
941 config['direction-total'] = dict(config['direction-forward'])
942 config['direction-total'].update({
943 'rate_percent': load_total,
944 'rate_pps': cast_integer(pps_total),
945 'rate_bps': bps_total
950 def get_run_config(self, results):
951 """Return configuration which was used for the last run."""
953 # because we want each direction to have the far end RX rates,
954 # use the far end index (1-idx) to retrieve the RX rates
955 for idx, key in enumerate(["direction-forward", "direction-reverse"]):
956 tx_rate = results["stats"][idx]["tx"]["total_pkts"] / self.config.duration_sec
957 rx_rate = results["stats"][1 - idx]["rx"]["total_pkts"] / self.config.duration_sec
959 "orig": self.__convert_rates(self.run_config['rates'][idx]),
960 "tx": self.__convert_rates({'rate_pps': tx_rate}),
961 "rx": self.__convert_rates({'rate_pps': rx_rate})
965 for direction in ['orig', 'tx', 'rx']:
966 total[direction] = {}
967 for unit in ['rate_percent', 'rate_bps', 'rate_pps']:
968 total[direction][unit] = sum([float(x[direction][unit]) for x in r.values()])
970 r['direction-total'] = total
973 def insert_interface_stats(self, pps_list):
974 """Insert interface stats to a list of packet path stats.
976 pps_list: a list of packet path stats instances indexed by chain index
978 This function will insert the packet path stats for the traffic gen ports 0 and 1
979 with itemized per chain tx/rx counters.
980 There will be as many packet path stats as chains.
981 Each packet path stats will have exactly 2 InterfaceStats for port 0 and port 1
984 PacketPathStats(InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)),
985 PacketPathStats(InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)),
989 def get_if_stats(chain_idx):
990 return [InterfaceStats('p' + str(port), self.tool)
991 for port in range(2)]
992 # keep the list of list of interface stats indexed by the chain id
993 self.ifstats = [get_if_stats(chain_idx)
994 for chain_idx in range(self.config.service_chain_count)]
995 # note that we need to make a copy of the ifs list so that any modification in the
996 # list from pps will not change the list saved in self.ifstats
997 self.pps_list = [PacketPathStats(list(ifs)) for ifs in self.ifstats]
998 # insert the corresponding pps in the passed list
999 pps_list.extend(self.pps_list)
1001 def update_interface_stats(self, diff=False):
1002 """Update all interface stats.
1004 diff: if False, simply refresh the interface stats values with latest values
1005 if True, diff the interface stats with the latest values
1006 Make sure that the interface stats inserted in insert_interface_stats() are updated
1010 [InterfaceStats(chain 0, port 0), InterfaceStats(chain 0, port 1)],
1011 [InterfaceStats(chain 1, port 0), InterfaceStats(chain 1, port 1)],
1016 stats = self.gen.get_stats()
1017 for chain_idx, ifs in enumerate(self.ifstats):
1018 # each ifs has exactly 2 InterfaceStats and 2 Latency instances
1019 # corresponding to the
1020 # port 0 and port 1 for the given chain_idx
1021 # Note that we cannot use self.pps_list[chain_idx].if_stats to pick the
1022 # interface stats for the pps because it could have been modified to contain
1023 # additional interface stats
1024 self.gen.get_stream_stats(stats, ifs, self.pps_list[chain_idx].latencies, chain_idx)
1028 def compare_tx_rates(required, actual):
1029 """Compare the actual TX rate to the required TX rate."""
1031 are_different = False
1033 if float(actual) / required < threshold:
1034 are_different = True
1035 except ZeroDivisionError:
1036 are_different = True
1039 msg = "WARNING: There is a significant difference between requested TX rate ({r}) " \
1040 "and actual TX rate ({a}). The traffic generator may not have sufficient CPU " \
1041 "to achieve the requested TX rate.".format(r=required, a=actual)
1047 def get_per_direction_rate(self):
1048 """Get the rate for each direction."""
1049 divisor = 2 if self.run_config['bidirectional'] else 1
1050 if 'rate_percent' in self.current_total_rate:
1051 # don't split rate if it's percentage
1054 return utils.divide_rate(self.current_total_rate, divisor)
1057 """Close this instance."""
1059 self.gen.stop_traffic()
1062 self.gen.clear_stats()