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Diffstat (limited to 'nfvbench/traffic_gen/trex_gen.py')
| -rw-r--r-- | nfvbench/traffic_gen/trex_gen.py | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/nfvbench/traffic_gen/trex_gen.py b/nfvbench/traffic_gen/trex_gen.py new file mode 100644 index 0000000..10937de --- /dev/null +++ b/nfvbench/traffic_gen/trex_gen.py @@ -0,0 +1,701 @@ +# Copyright 2016 Cisco Systems, Inc. All rights reserved. +# +# Licensed under the Apache License, Version 2.0 (the "License"); you may +# not use this file except in compliance with the License. You may obtain +# a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +# License for the specific language governing permissions and limitations +# under the License. +"""Driver module for TRex traffic generator.""" + +import math +import os +import random +import time +import traceback + +from itertools import count +from nfvbench.log import LOG +from nfvbench.traffic_server import TRexTrafficServer +from nfvbench.utils import cast_integer +from nfvbench.utils import timeout +from nfvbench.utils import TimeoutError +from traffic_base import AbstractTrafficGenerator +from traffic_base import TrafficGeneratorException +import traffic_utils as utils +from traffic_utils import IMIX_AVG_L2_FRAME_SIZE +from traffic_utils import IMIX_L2_SIZES +from traffic_utils import IMIX_RATIOS + +# pylint: disable=import-error +from trex.common.services.trex_service_arp import ServiceARP +from trex.stl.api import bind_layers +from trex.stl.api import CTRexVmInsFixHwCs +from trex.stl.api import Dot1Q +from trex.stl.api import Ether +from trex.stl.api import FlagsField +from trex.stl.api import IP +from trex.stl.api import Packet +from trex.stl.api import STLClient +from trex.stl.api import STLError +from trex.stl.api import STLFlowLatencyStats +from trex.stl.api import STLFlowStats +from trex.stl.api import STLPktBuilder +from trex.stl.api import STLScVmRaw +from trex.stl.api import STLStream +from trex.stl.api import STLTXCont +from trex.stl.api import STLVmFixChecksumHw +from trex.stl.api import STLVmFlowVar +from trex.stl.api import STLVmFlowVarRepeatableRandom +from trex.stl.api import STLVmWrFlowVar +from trex.stl.api import ThreeBytesField +from trex.stl.api import UDP +from trex.stl.api import XByteField + + +# pylint: enable=import-error + +class VXLAN(Packet): + """VxLAN class.""" + + _VXLAN_FLAGS = ['R' * 27] + ['I'] + ['R' * 5] + name = "VXLAN" + fields_desc = [FlagsField("flags", 0x08000000, 32, _VXLAN_FLAGS), + ThreeBytesField("vni", 0), + XByteField("reserved", 0x00)] + + def mysummary(self): + """Summary.""" + return self.sprintf("VXLAN (vni=%VXLAN.vni%)") + +class TRex(AbstractTrafficGenerator): + """TRex traffic generator driver.""" + + LATENCY_PPS = 1000 + CHAIN_PG_ID_MASK = 0x007F + PORT_PG_ID_MASK = 0x0080 + LATENCY_PG_ID_MASK = 0x0100 + + def __init__(self, traffic_client): + """Trex driver.""" + AbstractTrafficGenerator.__init__(self, traffic_client) + self.client = None + self.id = count() + self.port_handle = [] + self.chain_count = self.generator_config.service_chain_count + self.rates = [] + self.capture_id = None + self.packet_list = [] + + def get_version(self): + """Get the Trex version.""" + return self.client.get_server_version() if self.client else '' + + def get_pg_id(self, port, chain_id): + """Calculate the packet group IDs to use for a given port/stream type/chain_id. + + port: 0 or 1 + chain_id: identifies to which chain the pg_id is associated (0 to 255) + return: pg_id, lat_pg_id + + We use a bit mask to set up the 3 fields: + 0x007F: chain ID (8 bits for a max of 128 chains) + 0x0080: port bit + 0x0100: latency bit + """ + pg_id = port * TRex.PORT_PG_ID_MASK | chain_id + return pg_id, pg_id | TRex.LATENCY_PG_ID_MASK + + def extract_stats(self, in_stats): + """Extract stats from dict returned by Trex API. + + :param in_stats: dict as returned by TRex api + """ + utils.nan_replace(in_stats) + # LOG.debug(in_stats) + + result = {} + # port_handles should have only 2 elements: [0, 1] + # so (1 - ph) will be the index for the far end port + for ph in self.port_handle: + stats = in_stats[ph] + far_end_stats = in_stats[1 - ph] + result[ph] = { + 'tx': { + 'total_pkts': cast_integer(stats['opackets']), + 'total_pkt_bytes': cast_integer(stats['obytes']), + 'pkt_rate': cast_integer(stats['tx_pps']), + 'pkt_bit_rate': cast_integer(stats['tx_bps']) + }, + 'rx': { + 'total_pkts': cast_integer(stats['ipackets']), + 'total_pkt_bytes': cast_integer(stats['ibytes']), + 'pkt_rate': cast_integer(stats['rx_pps']), + 'pkt_bit_rate': cast_integer(stats['rx_bps']), + # how many pkts were dropped in RX direction + # need to take the tx counter on the far end port + 'dropped_pkts': cast_integer( + far_end_stats['opackets'] - stats['ipackets']) + } + } + self.__combine_latencies(in_stats, result[ph]['rx'], ph) + + total_tx_pkts = result[0]['tx']['total_pkts'] + result[1]['tx']['total_pkts'] + result["total_tx_rate"] = cast_integer(total_tx_pkts / self.config.duration_sec) + result["flow_stats"] = in_stats["flow_stats"] + result["latency"] = in_stats["latency"] + return result + + def get_stream_stats(self, trex_stats, if_stats, latencies, chain_idx): + """Extract the aggregated stats for a given chain. + + trex_stats: stats as returned by get_stats() + if_stats: a list of 2 interface stats to update (port 0 and 1) + latencies: a list of 2 Latency instances to update for this chain (port 0 and 1) + latencies[p] is the latency for packets sent on port p + if there are no latency streams, the Latency instances are not modified + chain_idx: chain index of the interface stats + + The packet counts include normal and latency streams. + + Trex returns flows stats as follows: + + 'flow_stats': {0: {'rx_bps': {0: 0, 1: 0, 'total': 0}, + 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'rx_bytes': {0: nan, 1: nan, 'total': nan}, + 'rx_pkts': {0: 0, 1: 15001, 'total': 15001}, + 'rx_pps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068}, + 'tx_pkts': {0: 15001, 1: 0, 'total': 15001}, + 'tx_pps': {0: 0, 1: 0, 'total': 0}}, + 1: {'rx_bps': {0: 0, 1: 0, 'total': 0}, + 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'rx_bytes': {0: nan, 1: nan, 'total': nan}, + 'rx_pkts': {0: 0, 1: 15001, 'total': 15001}, + 'rx_pps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'tx_bytes': {0: 1020068, 1: 0, 'total': 1020068}, + 'tx_pkts': {0: 15001, 1: 0, 'total': 15001}, + 'tx_pps': {0: 0, 1: 0, 'total': 0}}, + 128: {'rx_bps': {0: 0, 1: 0, 'total': 0}, + 'rx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'rx_bytes': {0: nan, 1: nan, 'total': nan}, + 'rx_pkts': {0: 15001, 1: 0, 'total': 15001}, + 'rx_pps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps': {0: 0, 1: 0, 'total': 0}, + 'tx_bps_l1': {0: 0.0, 1: 0.0, 'total': 0.0}, + 'tx_bytes': {0: 0, 1: 1020068, 'total': 1020068}, + 'tx_pkts': {0: 0, 1: 15001, 'total': 15001}, + 'tx_pps': {0: 0, 1: 0, 'total': 0}},etc... + + the pg_id (0, 1, 128,...) is the key of the dict and is obtained using the + get_pg_id() method. + packet counters for a given stream sent on port p are reported as: + - tx_pkts[p] on port p + - rx_pkts[1-p] on the far end port + + This is a tricky/critical counter transposition operation because + the results are grouped by port (not by stream): + tx_pkts_port(p=0) comes from pg_id(port=0, chain_idx)['tx_pkts'][0] + rx_pkts_port(p=0) comes from pg_id(port=1, chain_idx)['rx_pkts'][0] + tx_pkts_port(p=1) comes from pg_id(port=1, chain_idx)['tx_pkts'][1] + rx_pkts_port(p=1) comes from pg_id(port=0, chain_idx)['rx_pkts'][1] + + or using a more generic formula: + tx_pkts_port(p) comes from pg_id(port=p, chain_idx)['tx_pkts'][p] + rx_pkts_port(p) comes from pg_id(port=1-p, chain_idx)['rx_pkts'][p] + + the second formula is equivalent to + rx_pkts_port(1-p) comes from pg_id(port=p, chain_idx)['rx_pkts'][1-p] + + If there are latency streams, those same counters need to be added in the same way + """ + def get_latency(lval): + try: + return int(round(lval)) + except ValueError: + return 0 + + for ifs in if_stats: + ifs.tx = ifs.rx = 0 + for port in range(2): + pg_id, lat_pg_id = self.get_pg_id(port, chain_idx) + for pid in [pg_id, lat_pg_id]: + try: + pg_stats = trex_stats['flow_stats'][pid] + if_stats[port].tx += pg_stats['tx_pkts'][port] + if_stats[1 - port].rx += pg_stats['rx_pkts'][1 - port] + except KeyError: + pass + try: + lat = trex_stats['latency'][lat_pg_id]['latency'] + # dropped_pkts += lat['err_cntrs']['dropped'] + latencies[port].max_usec = get_latency(lat['total_max']) + if math.isnan(lat['total_min']): + latencies[port].min_usec = 0 + latencies[port].avg_usec = 0 + else: + latencies[port].min_usec = get_latency(lat['total_min']) + latencies[port].avg_usec = get_latency(lat['average']) + except KeyError: + pass + + def __combine_latencies(self, in_stats, results, port_handle): + """Traverse TRex result dictionary and combines chosen latency stats.""" + total_max = 0 + average = 0 + total_min = float("inf") + for chain_id in range(self.chain_count): + try: + _, lat_pg_id = self.get_pg_id(port_handle, chain_id) + lat = in_stats['latency'][lat_pg_id]['latency'] + # dropped_pkts += lat['err_cntrs']['dropped'] + total_max = max(lat['total_max'], total_max) + total_min = min(lat['total_min'], total_min) + average += lat['average'] + except KeyError: + pass + if total_min == float("inf"): + total_min = 0 + results['min_delay_usec'] = total_min + results['max_delay_usec'] = total_max + results['avg_delay_usec'] = int(average / self.chain_count) + + def _bind_vxlan(self): + bind_layers(UDP, VXLAN, dport=4789) + bind_layers(VXLAN, Ether) + + def _create_pkt(self, stream_cfg, l2frame_size): + """Create a packet of given size. + + l2frame_size: size of the L2 frame in bytes (including the 32-bit FCS) + """ + # Trex will add the FCS field, so we need to remove 4 bytes from the l2 frame size + frame_size = int(l2frame_size) - 4 + + if stream_cfg['vxlan'] is True: + self._bind_vxlan() + encap_level = '1' + pkt_base = Ether(src=stream_cfg['vtep_src_mac'], dst=stream_cfg['vtep_dst_mac']) + if stream_cfg['vtep_vlan'] is not None: + pkt_base /= Dot1Q(vlan=stream_cfg['vtep_vlan']) + pkt_base /= IP(src=stream_cfg['vtep_src_ip'], dst=stream_cfg['vtep_dst_ip']) + pkt_base /= UDP(sport=random.randint(1337, 32767), dport=4789) + pkt_base /= VXLAN(vni=stream_cfg['net_vni']) + pkt_base /= Ether(src=stream_cfg['mac_src'], dst=stream_cfg['mac_dst']) + else: + encap_level = '0' + pkt_base = Ether(src=stream_cfg['mac_src'], dst=stream_cfg['mac_dst']) + + if stream_cfg['vlan_tag'] is not None: + pkt_base /= Dot1Q(vlan=stream_cfg['vlan_tag']) + + udp_args = {} + if stream_cfg['udp_src_port']: + udp_args['sport'] = int(stream_cfg['udp_src_port']) + if stream_cfg['udp_dst_port']: + udp_args['dport'] = int(stream_cfg['udp_dst_port']) + pkt_base /= IP() / UDP(**udp_args) + + if stream_cfg['ip_addrs_step'] == 'random': + src_fv = STLVmFlowVarRepeatableRandom( + name="ip_src", + min_value=stream_cfg['ip_src_addr'], + max_value=stream_cfg['ip_src_addr_max'], + size=4, + seed=random.randint(0, 32767), + limit=stream_cfg['ip_src_count']) + dst_fv = STLVmFlowVarRepeatableRandom( + name="ip_dst", + min_value=stream_cfg['ip_dst_addr'], + max_value=stream_cfg['ip_dst_addr_max'], + size=4, + seed=random.randint(0, 32767), + limit=stream_cfg['ip_dst_count']) + else: + src_fv = STLVmFlowVar( + name="ip_src", + min_value=stream_cfg['ip_src_addr'], + max_value=stream_cfg['ip_src_addr'], + size=4, + op="inc", + step=stream_cfg['ip_addrs_step']) + dst_fv = STLVmFlowVar( + name="ip_dst", + min_value=stream_cfg['ip_dst_addr'], + max_value=stream_cfg['ip_dst_addr_max'], + size=4, + op="inc", + step=stream_cfg['ip_addrs_step']) + + vm_param = [ + src_fv, + STLVmWrFlowVar(fv_name="ip_src", pkt_offset="IP:{}.src".format(encap_level)), + dst_fv, + STLVmWrFlowVar(fv_name="ip_dst", pkt_offset="IP:{}.dst".format(encap_level)), + STLVmFixChecksumHw(l3_offset="IP:{}".format(encap_level), + l4_offset="UDP:{}".format(encap_level), + l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP) + ] + pad = max(0, frame_size - len(pkt_base)) * 'x' + + return STLPktBuilder(pkt=pkt_base / pad, vm=STLScVmRaw(vm_param)) + + def generate_streams(self, port, chain_id, stream_cfg, l2frame, latency=True): + """Create a list of streams corresponding to a given chain and stream config. + + port: port where the streams originate (0 or 1) + chain_id: the chain to which the streams are associated to + stream_cfg: stream configuration + l2frame: L2 frame size (including 4-byte FCS) or 'IMIX' + latency: if True also create a latency stream + """ + streams = [] + pg_id, lat_pg_id = self.get_pg_id(port, chain_id) + if l2frame == 'IMIX': + for ratio, l2_frame_size in zip(IMIX_RATIOS, IMIX_L2_SIZES): + pkt = self._create_pkt(stream_cfg, l2_frame_size) + streams.append(STLStream(packet=pkt, + flow_stats=STLFlowStats(pg_id=pg_id), + mode=STLTXCont(pps=ratio))) + + if latency: + # for IMIX, the latency packets have the average IMIX packet size + pkt = self._create_pkt(stream_cfg, IMIX_AVG_L2_FRAME_SIZE) + + else: + l2frame_size = int(l2frame) + pkt = self._create_pkt(stream_cfg, l2frame_size) + streams.append(STLStream(packet=pkt, + flow_stats=STLFlowStats(pg_id=pg_id), + mode=STLTXCont())) + # for the latency stream, the minimum payload is 16 bytes even in case of vlan tagging + # without vlan, the min l2 frame size is 64 + # with vlan it is 68 + # This only applies to the latency stream + if latency and stream_cfg['vlan_tag'] and l2frame_size < 68: + pkt = self._create_pkt(stream_cfg, 68) + + if latency: + streams.append(STLStream(packet=pkt, + flow_stats=STLFlowLatencyStats(pg_id=lat_pg_id), + mode=STLTXCont(pps=self.LATENCY_PPS))) + return streams + + @timeout(5) + def __connect(self, client): + client.connect() + + def __connect_after_start(self): + # after start, Trex may take a bit of time to initialize + # so we need to retry a few times + for it in xrange(self.config.generic_retry_count): + try: + time.sleep(1) + self.client.connect() + break + except Exception as ex: + if it == (self.config.generic_retry_count - 1): + raise + LOG.info("Retrying connection to TRex (%s)...", ex.message) + + def connect(self): + """Connect to the TRex server.""" + server_ip = self.generator_config.ip + LOG.info("Connecting to TRex (%s)...", server_ip) + + # Connect to TRex server + self.client = STLClient(server=server_ip, sync_port=self.generator_config.zmq_rpc_port, + async_port=self.generator_config.zmq_pub_port) + try: + self.__connect(self.client) + except (TimeoutError, STLError) as e: + if server_ip == '127.0.0.1': + try: + self.__start_server() + self.__connect_after_start() + except (TimeoutError, STLError) as e: + LOG.error('Cannot connect to TRex') + LOG.error(traceback.format_exc()) + logpath = '/tmp/trex.log' + if os.path.isfile(logpath): + # Wait for TRex to finish writing error message + last_size = 0 + for _ in xrange(self.config.generic_retry_count): + size = os.path.getsize(logpath) + if size == last_size: + # probably not writing anymore + break + last_size = size + time.sleep(1) + with open(logpath, 'r') as f: + message = f.read() + else: + message = e.message + raise TrafficGeneratorException(message) + else: + raise TrafficGeneratorException(e.message) + + ports = list(self.generator_config.ports) + self.port_handle = ports + # Prepare the ports + self.client.reset(ports) + # Read HW information from each port + # this returns an array of dict (1 per port) + """ + Example of output for Intel XL710 + [{'arp': '-', 'src_ipv4': '-', u'supp_speeds': [40000], u'is_link_supported': True, + 'grat_arp': 'off', 'speed': 40, u'index': 0, 'link_change_supported': 'yes', + u'rx': {u'counters': 127, u'caps': [u'flow_stats', u'latency']}, + u'is_virtual': 'no', 'prom': 'off', 'src_mac': u'3c:fd:fe:a8:24:48', 'status': 'IDLE', + u'description': u'Ethernet Controller XL710 for 40GbE QSFP+', + 'dest': u'fa:16:3e:3c:63:04', u'is_fc_supported': False, 'vlan': '-', + u'driver': u'net_i40e', 'led_change_supported': 'yes', 'rx_filter_mode': 'hardware match', + 'fc': 'none', 'link': 'UP', u'hw_mac': u'3c:fd:fe:a8:24:48', u'pci_addr': u'0000:5e:00.0', + 'mult': 'off', 'fc_supported': 'no', u'is_led_supported': True, 'rx_queue': 'off', + 'layer_mode': 'Ethernet', u'numa': 0}, ...] + """ + self.port_info = self.client.get_port_info(ports) + LOG.info('Connected to TRex') + for id, port in enumerate(self.port_info): + LOG.info(' Port %d: %s speed=%dGbps mac=%s pci=%s driver=%s', + id, port['description'], port['speed'], port['src_mac'], + port['pci_addr'], port['driver']) + # Make sure the 2 ports have the same speed + if self.port_info[0]['speed'] != self.port_info[1]['speed']: + raise TrafficGeneratorException('Traffic generator ports speed mismatch: %d/%d Gbps' % + (self.port_info[0]['speed'], + self.port_info[1]['speed'])) + + def __start_server(self): + server = TRexTrafficServer() + server.run_server(self.generator_config) + + def resolve_arp(self): + """Resolve all configured remote IP addresses. + + return: None if ARP failed to resolve for all IP addresses + else a dict of list of dest macs indexed by port# + the dest macs in the list are indexed by the chain id + """ + self.client.set_service_mode(ports=self.port_handle) + LOG.info('Polling ARP until successful...') + arp_dest_macs = {} + for port, device in zip(self.port_handle, self.generator_config.devices): + # there should be 1 stream config per chain + stream_configs = device.get_stream_configs() + chain_count = len(stream_configs) + ctx = self.client.create_service_ctx(port=port) + # all dest macs on this port indexed by chain ID + dst_macs = [None] * chain_count + dst_macs_count = 0 + # the index in the list is the chain id + if self.config.vxlan: + arps = [ + ServiceARP(ctx, + src_ip=device.vtep_src_ip, + dst_ip=device.vtep_dst_ip, + vlan=device.vtep_vlan) + for cfg in stream_configs + ] + else: + arps = [ + ServiceARP(ctx, + src_ip=cfg['ip_src_tg_gw'], + dst_ip=cfg['mac_discovery_gw'], + # will be None if no vlan tagging + vlan=cfg['vlan_tag']) + for cfg in stream_configs + ] + + for attempt in range(self.config.generic_retry_count): + try: + ctx.run(arps) + except STLError: + LOG.error(traceback.format_exc()) + continue + + unresolved = [] + for chain_id, mac in enumerate(dst_macs): + if not mac: + arp_record = arps[chain_id].get_record() + if arp_record.dst_mac: + dst_macs[chain_id] = arp_record.dst_mac + dst_macs_count += 1 + LOG.info(' ARP: port=%d chain=%d src IP=%s dst IP=%s -> MAC=%s', + port, chain_id, + arp_record.src_ip, + arp_record.dst_ip, arp_record.dst_mac) + else: + unresolved.append(arp_record.dst_ip) + if dst_macs_count == chain_count: + arp_dest_macs[port] = dst_macs + LOG.info('ARP resolved successfully for port %s', port) + break + else: + retry = attempt + 1 + LOG.info('Retrying ARP for: %s (retry %d/%d)', + unresolved, retry, self.config.generic_retry_count) + if retry < self.config.generic_retry_count: + time.sleep(self.config.generic_poll_sec) + else: + LOG.error('ARP timed out for port %s (resolved %d out of %d)', + port, + dst_macs_count, + chain_count) + break + + self.client.set_service_mode(ports=self.port_handle, enabled=False) + if len(arp_dest_macs) == len(self.port_handle): + return arp_dest_macs + return None + + def __is_rate_enough(self, l2frame_size, rates, bidirectional, latency): + """Check if rate provided by user is above requirements. Applies only if latency is True.""" + intf_speed = self.generator_config.intf_speed + if latency: + if bidirectional: + mult = 2 + total_rate = 0 + for rate in rates: + r = utils.convert_rates(l2frame_size, rate, intf_speed) + total_rate += int(r['rate_pps']) + else: + mult = 1 + total_rate = utils.convert_rates(l2frame_size, rates[0], intf_speed) + # rate must be enough for latency stream and at least 1 pps for base stream per chain + required_rate = (self.LATENCY_PPS + 1) * self.config.service_chain_count * mult + result = utils.convert_rates(l2frame_size, + {'rate_pps': required_rate}, + intf_speed * mult) + result['result'] = total_rate >= required_rate + return result + + return {'result': True} + + def create_traffic(self, l2frame_size, rates, bidirectional, latency=True): + """Program all the streams in Trex server. + + l2frame_size: L2 frame size or IMIX + rates: a list of 2 rates to run each direction + each rate is a dict like {'rate_pps': '10kpps'} + bidirectional: True if bidirectional + latency: True if latency measurement is needed + """ + r = self.__is_rate_enough(l2frame_size, rates, bidirectional, latency) + if not r['result']: + raise TrafficGeneratorException( + 'Required rate in total is at least one of: \n{pps}pps \n{bps}bps \n{load}%.' + .format(pps=r['rate_pps'], + bps=r['rate_bps'], + load=r['rate_percent'])) + # a dict of list of streams indexed by port# + # in case of fixed size, has self.chain_count * 2 * 2 streams + # (1 normal + 1 latency stream per direction per chain) + # for IMIX, has self.chain_count * 2 * 4 streams + # (3 normal + 1 latency stream per direction per chain) + streamblock = {} + for port in self.port_handle: + streamblock[port] = [] + stream_cfgs = [d.get_stream_configs() for d in self.generator_config.devices] + self.rates = [utils.to_rate_str(rate) for rate in rates] + for chain_id, (fwd_stream_cfg, rev_stream_cfg) in enumerate(zip(*stream_cfgs)): + streamblock[0].extend(self.generate_streams(self.port_handle[0], + chain_id, + fwd_stream_cfg, + l2frame_size, + latency=latency)) + if len(self.rates) > 1: + streamblock[1].extend(self.generate_streams(self.port_handle[1], + chain_id, + rev_stream_cfg, + l2frame_size, + latency=bidirectional and latency)) + + for port in self.port_handle: + self.client.add_streams(streamblock[port], ports=port) + LOG.info('Created %d traffic streams for port %s.', len(streamblock[port]), port) + + def clear_streamblock(self): + """Clear all streams from TRex.""" + self.rates = [] + self.client.reset(self.port_handle) + LOG.info('Cleared all existing streams') + + def get_stats(self): + """Get stats from Trex.""" + stats = self.client.get_stats() + return self.extract_stats(stats) + + def get_macs(self): + """Return the Trex local port MAC addresses. + + return: a list of MAC addresses indexed by the port# + """ + return [port['src_mac'] for port in self.port_info] + + def get_port_speed_gbps(self): + """Return the Trex local port MAC addresses. + + return: a list of speed in Gbps indexed by the port# + """ + return [port['speed'] for port in self.port_info] + + def clear_stats(self): + """Clear all stats in the traffic gneerator.""" + if self.port_handle: + self.client.clear_stats() + + def start_traffic(self): + """Start generating traffic in all ports.""" + for port, rate in zip(self.port_handle, self.rates): + self.client.start(ports=port, mult=rate, duration=self.config.duration_sec, force=True) + + def stop_traffic(self): + """Stop generating traffic.""" + self.client.stop(ports=self.port_handle) + + def start_capture(self): + """Capture all packets on both ports that are unicast to us.""" + if self.capture_id: + self.stop_capture() + # Need to filter out unwanted packets so we do not end up counting + # src MACs of frames that are not unicast to us + src_mac_list = self.get_macs() + bpf_filter = "ether dst %s or ether dst %s" % (src_mac_list[0], src_mac_list[1]) + # ports must be set in service in order to enable capture + self.client.set_service_mode(ports=self.port_handle) + self.capture_id = self.client.start_capture(rx_ports=self.port_handle, + bpf_filter=bpf_filter) + + def fetch_capture_packets(self): + """Fetch capture packets in capture mode.""" + if self.capture_id: + self.packet_list = [] + self.client.fetch_capture_packets(capture_id=self.capture_id['id'], + output=self.packet_list) + + def stop_capture(self): + """Stop capturing packets.""" + if self.capture_id: + self.client.stop_capture(capture_id=self.capture_id['id']) + self.capture_id = None + self.client.set_service_mode(ports=self.port_handle, enabled=False) + + def cleanup(self): + """Cleanup Trex driver.""" + if self.client: + try: + self.client.reset(self.port_handle) + self.client.disconnect() + except STLError: + # TRex does not like a reset while in disconnected state + pass |