resources/libraries/python/NsimUtil.py

   1 # Copyright (c) 2021 Cisco and/or its affiliates.
   2 # Licensed under the Apache License, Version 2.0 (the "License");
   3 # you may not use this file except in compliance with the License.
   4 # You may obtain a copy of the License at:
   5 #
   6 #     http://www.apache.org/licenses/LICENSE-2.0
   7 #
   8 # Unless required by applicable law or agreed to in writing, software
   9 # distributed under the License is distributed on an "AS IS" BASIS,
  10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  11 # See the License for the specific language governing permissions and
  12 # limitations under the License.
  13
  14 """VPP Network Simulator Plugin util library."""
  15
  16 from resources.libraries.python.PapiExecutor import PapiSocketExecutor
  17 from resources.libraries.python.InterfaceUtil import InterfaceUtil
  18
  19
  20 class NsimUtil():
  21     """VPP NSIM Plugin Keywords."""
  22
  23     @staticmethod
  24     def configure_vpp_nsim(node, vpp_nsim_attr, interface0, interface1=None):
  25         """Configure nsim on the specified VPP node.
  26
  27         :param node: Topology node.
  28         :param vpp_nsim_attr: VPP NSIM configuration attributes
  29         :param interface0: Interface name.
  30         :param interface1: 2nd Interface name for cross-connect feature
  31         :type node: dict
  32         :type vpp_nsim_attr: dict
  33         :type interface0: str or int
  34         :type interface1: str or int
  35         :raises RuntimeError: if no NSIM features are enabled or
  36                 vpp papi command fails.
  37         """
  38         host = node[u"host"]
  39         if not vpp_nsim_attr[u"output_nsim_enable"] \
  40                 and not vpp_nsim_attr[u"xc_nsim_enable"]:
  41             raise RuntimeError(f"No NSIM features enabled on host {host}:\n"
  42                                f"vpp_nsim_attr = {vpp_nsim_attr}")
  43         cmd = u"nsim_configure2"
  44         args = dict(
  45             delay_in_usec=vpp_nsim_attr[u"delay_in_usec"],
  46             average_packet_size=vpp_nsim_attr[u"average_packet_size"],
  47             bandwidth_in_bits_per_second=vpp_nsim_attr[
  48                 u"bw_in_bits_per_second"
  49             ],
  50             packets_per_drop=vpp_nsim_attr[u"packets_per_drop"],
  51             packets_per_reorder=vpp_nsim_attr.get(u"packets_per_reorder", 0)
  52         )
  53         err_msg = f"Failed to configure NSIM on host {host}"
  54         try:
  55             with PapiSocketExecutor(node) as papi_exec:
  56                 papi_exec.add(cmd, **args).get_reply(err_msg)
  57         except AssertionError:
  58             # Perhaps VPP is an older version
  59             old_cmd = u"nsim_configure"
  60             args.pop(u"packets_per_reorder")
  61             with PapiSocketExecutor(node) as papi_exec:
  62                 papi_exec.add(old_cmd, **args).get_reply(err_msg)
  63
  64         if vpp_nsim_attr[u"output_nsim_enable"]:
  65             cmd = u"nsim_output_feature_enable_disable"
  66             args = dict(
  67                 enable_disable=vpp_nsim_attr[u"output_nsim_enable"],
  68                 sw_if_index=InterfaceUtil.get_interface_index(node, interface0),
  69             )
  70             err_msg = f"Failed to enable NSIM output feature on " \
  71                 f"host {host} interface {interface0}"
  72             with PapiSocketExecutor(node) as papi_exec:
  73                 papi_exec.add(cmd, **args).get_reply(err_msg)
  74
  75         elif vpp_nsim_attr[u"xc_nsim_enable"]:
  76             cmd = u"nsim_cross_connect_feature_enable_disable"
  77             args = dict(
  78                 enable_disable=vpp_nsim_attr[u"xc_nsim_enable"],
  79                 sw_if_index0=InterfaceUtil.get_interface_index(node,
  80                                                                interface0),
  81                 sw_if_index1=InterfaceUtil.get_interface_index(node,
  82                                                                interface1),
  83             )
  84             err_msg = f"Failed to enable NSIM output feature on " \
  85                 f"host {host} interface {interface0}"
  86             with PapiSocketExecutor(node) as papi_exec:
  87                 papi_exec.add(cmd, **args).get_reply(err_msg)