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         subprocess.Popen(['nohup', '/bin/bash', '-c',
  53                           './t-rex-64 -i -c {} --iom 0 --no-scapy-server --close-at-end {} '
  54                           '{} {} --cfg {} &> /tmp/trex.log & disown'.format(cores, sw_mode,
  55                                                                             vlan_opt,
  56                                                                             mbuf_opt, cfg)],
  57                          cwd=self.trex_dir)
  58         LOG.info('TRex server is running...')
  59
  60     def __load_config(self, filename):
  61         result = {}
  62         if os.path.exists(filename):
  63             with open(filename, 'r') as stream:
  64                 try:
  65                     result = yaml.load(stream)
  66                 except yaml.YAMLError as exc:
  67                     print exc
  68         return result
  69
  70     def __save_config(self, generator_config, filename):
  71         result = self.__prepare_config(generator_config)
  72         yaml.safe_load(result)
  73         if os.path.exists(filename):
  74             os.remove(filename)
  75         with open(filename, 'w') as f:
  76             f.write(result)
  77         return filename
  78
  79     def __prepare_config(self, generator_config):
  80         ifs = ",".join([repr(pci) for pci in generator_config.pcis])
  81         result = """# Config generated by NFVbench
  82         - port_limit : 2
  83           version    : 2
  84           zmq_pub_port : {zmq_pub_port}
  85           zmq_rpc_port : {zmq_rpc_port}
  86           prefix       : {prefix}
  87           limit_memory : {limit_memory}
  88           interfaces : [{ifs}]""".format(zmq_pub_port=generator_config.zmq_pub_port,
  89                                          zmq_rpc_port=generator_config.zmq_rpc_port,
  90                                          prefix=generator_config.name,
  91                                          limit_memory=generator_config.limit_memory,
  92                                          ifs=ifs)
  93         if hasattr(generator_config, 'platform'):
  94             if generator_config.platform.master_thread_id \
  95                     and generator_config.platform.latency_thread_id:
  96                 platform = """
  97           platform     :
  98             master_thread_id  : {master_thread_id}
  99             latency_thread_id : {latency_thread_id}
 100             dual_if:""".format(master_thread_id=generator_config.platform.master_thread_id,
 101                                latency_thread_id=generator_config.platform.latency_thread_id)
 102                 result += platform
 103
 104                 for core in generator_config.platform.dual_if:
 105                     threads = ""
 106                     try:
 107                         threads = ",".join([repr(thread) for thread in core.threads])
 108                     except TypeError:
 109                         LOG.warn("No threads defined for socket %s", core.socket)
 110                     core_result = """
 111                   - socket : {socket}
 112                     threads : [{threads}]""".format(socket=core.socket, threads=threads)
 113                     result += core_result
 114             else:
 115                 LOG.info("Generator profile 'platform' sub-properties are set but not filled in \
 116                          config file. TRex will use default values.")
 117         return result
 118
 119     def check_config_updated(self, generator_config):
 120         existing_config = self.__load_config(filename='/etc/trex_cfg.yaml')
 121         new_config = yaml.safe_load(self.__prepare_config(generator_config))
 122         LOG.debug("Existing config: %s", existing_config)
 123         LOG.debug("New config: %s", new_config)
 124         if existing_config == new_config:
 125             return False
 126         return True