nfvbench/traffic_server.py

   1 # Copyright 2016 Cisco Systems, Inc.  All rights reserved.
   2 #
   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
   6 #
   7 #         http://www.apache.org/licenses/LICENSE-2.0
   8 #
   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
  13 #    under the License.
  14
  15 import os
  16 import subprocess
  17 import yaml
  18
  19 from .log import LOG
  20
  21
  22 class TrafficServerException(Exception):
  23     pass
  24
  25 class TrafficServer(object):
  26     """Base class for traffic servers."""
  27
  28 class TRexTrafficServer(TrafficServer):
  29     """Creates configuration file for TRex and runs server."""
  30
  31     def __init__(self, trex_base_dir='/opt/trex'):
  32         contents = os.listdir(trex_base_dir)
  33         # only one version of TRex should be supported in container
  34         assert len(contents) == 1
  35         self.trex_dir = os.path.join(trex_base_dir, contents[0])
  36
  37     def run_server(self, generator_config, filename='/etc/trex_cfg.yaml'):
  38         """Run TRex server for specified traffic profile.
  39
  40         :param traffic_profile: traffic profile object based on config file
  41         :param filename: path where to save TRex config file
  42         """
  43         cfg = self.__save_config(generator_config, filename)
  44         cores = generator_config.cores
  45         vtep_vlan = generator_config.gen_config.get('vtep_vlan')
  46         sw_mode = "--software" if generator_config.software_mode else ""
  47         vlan_opt = "--vlan" if (generator_config.vlan_tagging or vtep_vlan) else ""
  48         if generator_config.mbuf_factor:
  49             mbuf_opt = "--mbuf-factor " + str(generator_config.mbuf_factor)
  50         else:
  51             mbuf_opt = ""
  52         hdrh_opt = "--hdrh" if generator_config.hdrh else ""
  53         # --unbind-unused-ports: for NIC that have more than 2 ports such as Intel X710
  54         # this will instruct trex to unbind all ports that are unused instead of
  55         # erroring out with an exception (i40e only)
  56         cmd = ['nohup', '/bin/bash', '-c',
  57                './t-rex-64 -i -c {} --iom 0 --no-scapy-server '
  58                '--unbind-unused-ports --close-at-end {} {} '
  59                '{} {} --cfg {} &> /tmp/trex.log & disown'.format(cores, sw_mode,
  60                                                                  vlan_opt,
  61                                                                  hdrh_opt,
  62                                                                  mbuf_opt, cfg)]
  63         LOG.info(' '.join(cmd))
  64         subprocess.Popen(cmd, cwd=self.trex_dir)
  65         LOG.info('TRex server is running...')
  66
  67     def __load_config(self, filename):
  68         result = {}
  69         if os.path.exists(filename):
  70             with open(filename, 'r') as stream:
  71                 try:
  72                     result = yaml.safe_load(stream)
  73                 except yaml.YAMLError as exc:
  74                     print(exc)
  75         return result
  76
  77     def __save_config(self, generator_config, filename):
  78         result = self.__prepare_config(generator_config)
  79         yaml.safe_load(result)
  80         if os.path.exists(filename):
  81             os.remove(filename)
  82         with open(filename, 'w') as f:
  83             f.write(result)
  84         return filename
  85
  86     def __prepare_config(self, generator_config):
  87         ifs = ",".join([repr(pci) for pci in generator_config.pcis])
  88         result = """# Config generated by NFVbench
  89         - port_limit : 2
  90           version    : 2
  91           zmq_pub_port : {zmq_pub_port}
  92           zmq_rpc_port : {zmq_rpc_port}
  93           prefix       : {prefix}
  94           limit_memory : {limit_memory}
  95           interfaces : [{ifs}]""".format(zmq_pub_port=generator_config.zmq_pub_port,
  96                                          zmq_rpc_port=generator_config.zmq_rpc_port,
  97                                          prefix=generator_config.name,
  98                                          limit_memory=generator_config.limit_memory,
  99                                          ifs=ifs)
 100         if hasattr(generator_config, 'mbuf_64') and generator_config.mbuf_64:
 101             result += """
 102           memory       :
 103             mbuf_64           : {mbuf_64}""".format(mbuf_64=generator_config.mbuf_64)
 104
 105         if self.__check_platform_config(generator_config):
 106             try:
 107                 platform = """
 108           platform     :
 109             master_thread_id  : {master_thread_id}
 110             latency_thread_id : {latency_thread_id}
 111             dual_if:""".format(master_thread_id=generator_config.gen_config.platform.
 112                                master_thread_id,
 113                                latency_thread_id=generator_config.gen_config.platform.
 114                                latency_thread_id)
 115                 result += platform
 116
 117                 for core in generator_config.gen_config.platform.dual_if:
 118                     threads = ""
 119                     try:
 120                         threads = ",".join([repr(thread) for thread in core.threads])
 121                     except TypeError:
 122                         LOG.warning("No threads defined for socket %s", core.socket)
 123                     core_result = """
 124                   - socket : {socket}
 125                     threads : [{threads}]""".format(socket=core.socket, threads=threads)
 126                     result += core_result
 127             except (KeyError, AttributeError):
 128                 pass
 129         return result
 130
 131     def __check_platform_config(self, generator_config):
 132         return hasattr(generator_config.gen_config, 'platform') \
 133             and hasattr(generator_config.gen_config.platform, "master_thread_id") \
 134             and generator_config.gen_config.platform.master_thread_id is not None \
 135             and hasattr(generator_config.gen_config.platform, "latency_thread_id") \
 136             and generator_config.gen_config.platform.latency_thread_id is not None
 137
 138     def check_config_updated(self, generator_config):
 139         existing_config = self.__load_config(filename='/etc/trex_cfg.yaml')
 140         new_config = yaml.safe_load(self.__prepare_config(generator_config))
 141         LOG.debug("Existing config: %s", existing_config)
 142         LOG.debug("New config: %s", new_config)
 143         if existing_config == new_config:
 144             return False
 145         return True