class TRex(TrafficGeneratorChassis):
def __init__(self, **kwargs):
super(TRex, self).__init__(**kwargs)
self.hostname = kwargs.pop("hostname", "localhost")
self.__trex_client = STLClient(server=self.hostname)
def _verify_port_action(self, port_name):
if self.is_connected() and self._verify_port_string(port_name) and \
port_name in self.port_data:
return (True)
return (False)
def _verify_port_string(self, port_name):
try:
if int(port_name) < 0:
return False
except ValueError:
return False
return True
def connect(self):
if not self.is_connected():
self.__trex_client.connect()
return self.is_connected()
def disconnect(self):
if self.is_connected:
for port in list(self.port_data.keys()):
self.port_data[port] = self.release_port(port)
self.__trex_client.disconnect()
return True
def is_connected(self):
return self.__trex_client.is_connected()
def reserve_port(self, port_name):
if not self._verify_port_string(port_name):
return False
try:
self.__trex_client.acquire(ports=[int(port_name)], force=True)
except STLError:
return False
try:
self.__trex_client.reset(ports=[int(port_name)])
except STLError:
self.__trex_client.release(ports=[int(port_name)])
return False
tport = _TRexPort(port_name, self.__trex_client)
if tport is None:
return False
return super(TRex, self).reserve_port(port_name, tport)
def release_port(self, port_name):
if not self._verify_port_string(port_name) or \
port_name not in self.port_data:
return False
try:
self.__trex_client.release(ports=[port_name])
except STLError:
pass
return super(TRex, self).release_port(port_name)
#
# FIXME: All the port specific functions should be re factored to use the
# base class so the shared code in _xena and _trex can be removed.
#
def clear_statistics(self, port_name):
if self._verify_port_action(port_name):
self.port_data[port_name].clear_statistics()
def take_tx_statistics_snapshot(self, port_name):
if self._verify_port_action(port_name):
self.port_data[port_name].take_tx_statistics_snapshot()
def take_rx_statistics_snapshot(self, port_name):
if self._verify_port_action(port_name):
self.port_data[port_name].take_rx_statistics_snapshot()
def get_tx_statistics_snapshots(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].get_tx_statistics_snapshots()
return None
def get_rx_statistics_snapshots(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].get_rx_statistics_snapshots()
return None
def start_traffic(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].start_traffic()
return False
def stop_traffic(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].stop_traffic()
return False
def configure_traffic_stream(self, port_name, traffic_flows, nr_of_flows,
packet_size, **kwargs):
if self._verify_port_action(port_name):
return self.port_data[port_name].configure_traffic_stream(
traffic_flows, nr_of_flows, packet_size, **kwargs)
return False
def next_traffic_stream(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].next_traffic_stream()
return False
def get_port_limits(self, port_name):
if self._verify_port_action(port_name):
return self.port_data[port_name].get_port_limits()
return dict()
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'])
# pick up the HDR histogram if present (otherwise will raise KeyError)
latencies[port].hdrh = lat['hdrh']
except KeyError:
pass
def __combine_latencies(self, in_stats, results, port_handle):
"""Traverse TRex result dictionary and combines chosen latency stats.
example of latency dict returned by trex (2 chains):
'latency': {256: {'err_cntrs': {'dropped': 0,
'dup': 0,
'out_of_order': 0,
'seq_too_high': 0,
'seq_too_low': 0},
'latency': {'average': 26.5,
'hdrh': u'HISTFAAAAEx4nJNpmSgz...bFRgxi',
'histogram': {20: 303,
30: 320,
40: 300,
50: 73,
60: 4,
70: 1},
'jitter': 14,
'last_max': 63,
'total_max': 63,
'total_min': 20}},
257: {'err_cntrs': {'dropped': 0,
'dup': 0,
'out_of_order': 0,
'seq_too_high': 0,
'seq_too_low': 0},
'latency': {'average': 29.75,
'hdrh': u'HISTFAAAAEV4nJN...CALilDG0=',
'histogram': {20: 261,
30: 431,
40: 3,
50: 80,
60: 225},
'jitter': 23,
'last_max': 67,
'total_max': 67,
'total_min': 20}},
384: {'err_cntrs': {'dropped': 0,
'dup': 0,
'out_of_order': 0,
'seq_too_high': 0,
'seq_too_low': 0},
'latency': {'average': 18.0,
'hdrh': u'HISTFAAAADR4nJNpm...MjCwDDxAZG',
'histogram': {20: 987, 30: 14},
'jitter': 0,
'last_max': 34,
'total_max': 34,
'total_min': 20}},
385: {'err_cntrs': {'dropped': 0,
'dup': 0,
'out_of_order': 0,
'seq_too_high': 0,
'seq_too_low': 0},
'latency': {'average': 19.0,
'hdrh': u'HISTFAAAADR4nJNpm...NkYmJgDdagfK',
'histogram': {20: 989, 30: 11},
'jitter': 0,
'last_max': 38,
'total_max': 38,
'total_min': 20}},
'global': {'bad_hdr': 0, 'old_flow': 0}},
"""
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
vm_param = []
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'])
# need to randomize the outer header UDP src port based on flow
vxlan_udp_src_fv = STLVmFlowVar(
name="vxlan_udp_src",
min_value=1337,
max_value=32767,
size=2,
op="random")
vm_param = [vxlan_udp_src_fv,
STLVmWrFlowVar(fv_name="vxlan_udp_src", pkt_offset="UDP.sport")]
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.extend([
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))
])
for encap in range(int(encap_level), -1, -1):
# Fixing the checksums for all encap levels
vm_param.append(STLVmFixChecksumHw(l3_offset="IP:{}".format(encap),
l4_offset="UDP:{}".format(encap),
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,
e2e=False):
"""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
e2e: True if performing "end to end" connectivity check
"""
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)
if e2e:
streams.append(STLStream(packet=pkt,
mode=STLTXCont(pps=ratio)))
else:
if stream_cfg['vxlan'] is True:
streams.append(STLStream(packet=pkt,
flow_stats=STLFlowStats(pg_id=pg_id,
vxlan=True),
mode=STLTXCont(pps=ratio)))
else:
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)
if e2e:
streams.append(STLStream(packet=pkt,
mode=STLTXCont()))
else:
if stream_cfg['vxlan'] is True:
streams.append(STLStream(packet=pkt,
flow_stats=STLFlowStats(pg_id=pg_id,
vxlan=True),
mode=STLTXCont()))
else:
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:
# TRex limitation: VXLAN skip is not supported for latency stream
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)
if server_ip == '127.0.0.1':
config_updated = self.__check_config()
if config_updated or self.config.restart:
self.__restart()
except (TimeoutError, STLError) as e:
if server_ip == '127.0.0.1':
self.__start_local_server()
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_local_server(self):
try:
LOG.info("Starting TRex ...")
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)
def __start_server(self):
server = TRexTrafficServer()
server.run_server(self.generator_config)
def __check_config(self):
server = TRexTrafficServer()
return server.check_config_updated(self.generator_config)
def __restart(self):
LOG.info("Restarting TRex ...")
self.__stop_server()
# Wait for server stopped
for _ in xrange(self.config.generic_retry_count):
time.sleep(1)
if not self.client.is_connected():
LOG.info("TRex is stopped...")
break
self.__start_local_server()
def __stop_server(self):
if self.generator_config.ip == '127.0.0.1':
ports = self.client.get_acquired_ports()
LOG.info('Release ports %s and stopping TRex...', ports)
try:
if ports:
self.client.release(ports=ports)
self.client.server_shutdown()
except STLError as e:
LOG.warn('Unable to stop TRex. Error: %s', e)
else:
LOG.info('Using remote TRex. Unable to stop TRex')
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, e2e=False):
"""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
e2e: True if performing "end to end" connectivity check
"""
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,
e2e=e2e))
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,
e2e=e2e))
for port in self.port_handle:
if self.config.vxlan:
self.client.set_port_attr(ports=port, vxlan_fs=[4789])
else:
self.client.set_port_attr(ports=port, vxlan_fs=None)
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