This document is intended to aid those who want to modify the vsperf code. Or to extend it - for example to add support for new traffic generators, deployment scenarios and so on.

$ ./vsperf -h of course, lists all the cli options

$ ./vsperf –tests 'tput' run all tests that have 'tput' in their name - p2p_tput, pvp_tput etc.

$ ./vsperf –conf-file my_settings.py –tests 'tput' as above but override default configuration with settings in 'my_settings.py'. This is useful as modifying configuration directly in the configuration files in conf/NN_*.py shows up as changes under git source control

$ ./vsperf –test-params 'rfc2544_duration=10;rfc2544_trials=1;packet_sizes=64' –tests 'pvp_tput' override specific test parameters. Useful for shortening the duration of tests for development purposes.

This is a typical flow of control for a test.

This diagram was generated using mscgen. For ease of editing the text used to generate the diagram is included below.

Details of conf/01_testcase.conf goes here.

The conf package contains the configuration files (*.conf) for all system components, it also provides a ``settings`` object that exposes all of these settings.

Settings are not passed from component to component. Rather they are available globally to all components once they import the conf package.

from conf import settings … log_file = settings.getValue('LOG_FILE_DEFAULT')

Settings files (*.conf) are valid python code so can be set to complex types such as lists and dictionaries as well as scalar types:

first_packet_size = settings.getValue('PACKET_SIZE_LIST')[0]  

Configuration files follow a strict naming convention that allows them to be processed in a specific order. All the .conf files are named ``NN_name.conf``, where NN is a decimal digit. The files are processed in order from 00_name.conf to 99_name.conf so that if the name setting is given in both a lower and higher numbered conf file then the higher numbered file is the effective setting as it is processed after the setting in the lower numbered file.

The values in the file specified by ``–conf-file`` takes precedence over all the other configuration files and does not have to follow the naming convention.

``conf.settings`` also loads configuration from the command line and from the environment.

VSPERF supports different vSwithes, Traffic Generators and VNFs by using standard object-oriented polymorphism:

• Support for vSwitches is implemented by a class inheriting from IVSwitch.
• Support for Traffic Generators is implemented by a class inheriting from ITrafficGenerator.
• Support for VNF is implemented by a class inheriting from IVNF.

By dealing only with the abstract interfaces the core framework can support many implementations of different vSwitches, Traffic Generators and VNFs.

IVSwitch

class IVSwitch:
    start(self)
    stop(self)
    add_switch(switch_name)
    del_switch(switch_name)
    add_phy_port(switch_name)
    add_vport(switch_name)
    get_ports(switch_name)
    del_port(switch_name, port_name)
    add_flow(switch_name, flow)
    del_flow(switch_name, flow=None)

IVnf

mscgen is available here

msc {

  #Options
  
  hscale = "2.0";

  #Entities
  vsperf, testcase, vnf_ctl, vnf, vswitch_ctl, vswitch, traffic_ctl, traffic_gen, load_gen;

  #Arcs
  vsperf note vsperf [ label = "$ ./vsperf pvp_tput" ];
  vsperf note vsperf [ label = " foreach test specified" ];
  vsperf => testcase [ label="run()" ];
  --- [ label = " skipping details of finding and creating correct subclasses of IVSwitch, ITrafficGenerator etc." ];
  testcase => vswitch_ctl [ label="create(vswitch_class" ];
  vswitch_ctl note vswitch_ctl [ label="vswitch_ctl is instance of VswitchControllerPvp"];
  testcase => vnf_ctl [ label="create(vnf_class)" ];
  vnf_ctl note vnf_ctl [ label="vnf_ctl is instance of VnfControllerPvp"];
  testcase => traffic_ctl [ label="create()" ];
  traffic_ctl note traffic_ctl [ label="traffic_ctl is instance of TrafficControllerRFC2544"];
  |||;
  testcase note testcase [ label="Python context management protocol __enter__, __exit__ is used to start/stop controllers"];
  testcase => vswitch_ctl [ label="__enter__()"];
  vswitch_ctl => vswitch [ label ="create()"];
  vswitch note vswitch [label="vswitch is instance of OvsDpdkVhost"];
  vswitch_ctl => vswitch [ label="add_phy_port()" ];
  vswitch_ctl => vswitch [ label="add_vport()" ];
  vswitch_ctl => vswitch [ label="add_flow()" ];
  --- [ label = " skipping full details of switch configuration " ];
  |||;
  testcase => vnf_ctl [ label="__enter__()"];
  vnf_ctl => vnf [ label="create()"];
  |||;
  testcase => load_gen [ label="create/start()" ];
  load_gen note load_gen [ label="loadgen simulates system load using 'stress' tool "];
  |||;
  testcase => traffic_ctl [ label="send_traffic(traffic)" ];
  traffic_ctl note traffic_ctl [ label="'traffic' specifies the 'Traffic Type' from 01_testcases.conf as well as other traffic details" ];
  traffic_ctl => traffic_gen [label="send_rfc2544_throughput()"];
  traffic_gen note traffic_gen [label="The implementation is dependent on the vendor specific Traffic Gen used"];
  |||;
  traffic_ctl << traffic_gen [label="returns results as str:value pairs"];
  testcase << traffic_ctl;
  testcase => traffic_ctl [label="get_results()"];
  testcase => testcase [label="write_result_to_file()"];
  |||;
  |||;
}