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| -rwxr-xr-x | docs/design/vswitchperf_design.rst | 158 |
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diff --git a/docs/design/vswitchperf_design.rst b/docs/design/vswitchperf_design.rst index cdf9f318..375fa12e 100755 --- a/docs/design/vswitchperf_design.rst +++ b/docs/design/vswitchperf_design.rst @@ -100,6 +100,164 @@ 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. +Configuration of PATHS dictionary +--------------------------------- + +VSPERF uses external tools like Open vSwitch and Qemu for execution of testcases. These +tools may be downloaded and built automatically by `VSPERF installation scripts`_ +or installed manually by user from binary packages. It is also possible to use a combination +of both approaches, but it is essential to correctly set paths to all required tools. +These paths are stored within a PATHS dictionary, which is evaluated before execution +of each testcase, in order to setup testcase specific environment. Values selected for testcase +execution are internally stored inside TOOLS dictionary, which is used by VSPERF to execute +external tools, load kernel modules, etc. + +The default configuration of PATHS dictionary is spread among three different configuration files +to follow logical grouping of configuration options. Basic description of PATHS dictionary +is placed inside ``conf/00_common.conf``. The configuration specific to DPDK and vswitches +is located at ``conf/02_vswitch.conf``. The last part related to the Qemu is defined inside +``conf/04_vnf.conf``. Default configuration values can be used in case, that all required +tools were downloaded and built automatically by vsperf itself. In case, that some of +tools were installed manually from binary packages, then it will be necessary to modify +the content of PATHS dictionary accordingly. + +Dictionary has a specific section of configuration options for every tool type, it means: + + * ``PATHS['vswitch']`` - contains a separete dictionary for each of vswitches supported by VSPEF + + Example: + + .. code-block:: python + + PATHS['vswitch'] = { + 'OvsDpdkVhost': { ... }, + 'OvsVanilla' : { ... }, + ... + } + + * ``PATHS['dpdk']`` - contains paths to the dpdk sources, kernel modules and tools (e.g. testpmd) + + Example: + + .. code-block:: python + + PATHS['dpdk'] = { + 'type' : 'src', + 'src': { + 'path': os.path.join(ROOT_DIR, 'src/dpdk/dpdk/'), + 'modules' : ['uio', os.path.join(RTE_TARGET, 'kmod/igb_uio.ko')], + 'bind-tool': 'tools/dpdk*bind.py', + 'testpmd': os.path.join(RTE_TARGET, 'app', 'testpmd'), + }, + ... + } + + * ``PATHS['qemu']`` - contains paths to the qemu sources and executable file + + Example: + + .. code-block:: python + + PATHS['qemu'] = { + 'type' : 'bin', + 'bin': { + 'qemu-system': 'qemu-system-x86_64' + }, + ... + } + +Every section specific to the particular vswitch, dpdk or qemu may contain following types +of configuration options: + + * option ``type`` - is a string, which defines the type of configured paths ('src' or 'bin') + to be selected for a given section: + + * value ``src`` means, that VSPERF will use vswitch, DPDK or QEMU built from sources + e.g. by execution of ``systems/build_base_machine.sh`` script during VSPERF + installation + + * value ``bin`` means, that VSPERF will use vswitch, DPDK or QEMU binaries installed + directly in the operating system, e.g. via OS specific packaging system + + * option ``path`` - is a string with a valid system path; Its content is checked for + existence, prefixed with section name and stored into TOOLS for later use + e.g. ``TOOLS['dpdk_src']`` or ``TOOLS['vswitch_src']`` + + * option ``modules`` - is list of strings with names of kernel modules; Every module name + from given list is checked for a '.ko' suffix. In case that it matches and if it is not + an absolute path to the module, then module name is prefixed with value of ``path`` + option defined for the same section + + Example: + + .. code-block:: python + + """ + snippet of PATHS definition from the configuration file: + """ + PATHS['vswitch'] = { + 'OvsVanilla' = { + 'type' : 'src', + 'src': { + 'path': '/tmp/vsperf/src_vanilla/ovs/ovs/', + 'modules' : ['datapath/linux/openvswitch.ko'], + ... + }, + ... + } + ... + } + + """ + Final content of TOOLS dictionary used during runtime: + """ + TOOLS['vswitch_modules'] = ['/tmp/vsperf/src_vanilla/ovs/ovs/datapath/linux/openvswitch.ko'] + + * all other options are strings with names and paths to specific tools; If a given string + contains a relative path and option ``path`` is defined for a given section, then string + content will be prefixed with content of the ``path``. Otherwise the name of the tool will be + searched within standard system directories. In case that filename contains OS specific + wildcards, then they will be expanded to the real path. At the end of the processing, every + absolute path will be checked for its existence. In case that temporary path (i.e. path with + a ``_tmp`` suffix) does not exist, then log will be written and vsperf will continue. If any + other path will not exist, then vsperf execution will be terminated with a runtime error. + + Example: + + .. code-block:: python + + """ + snippet of PATHS definition from the configuration file: + """ + PATHS['vswitch'] = { + 'OvsDpdkVhost': { + 'type' : 'src', + 'src': { + 'path': '/tmp/vsperf/src_vanilla/ovs/ovs/', + 'ovs-vswitchd': 'vswitchd/ovs-vswitchd', + 'ovsdb-server': 'ovsdb/ovsdb-server', + ... + } + ... + } + ... + } + + """ + Final content of TOOLS dictionary used during runtime: + """ + TOOLS['ovs-vswitchd'] = '/tmp/vsperf/src_vanilla/ovs/ovs/vswitchd/ovs-vswitchd' + TOOLS['ovsdb-server'] = '/tmp/vsperf/src_vanilla/ovs/ovs/ovsdb/ovsdb-server' + +Note: In case that ``bin`` type is set for DPDK, then ``TOOLS['dpdk_src']`` will be set to +the value of ``PATHS['dpdk']['src']['path']``. The reason is, that VSPERF uses downloaded +DPDK sources to copy DPDK and testpmd into the GUEST, where testpmd is built. In case, +that DPDK sources are not available, then vsperf will continue with test execution, +but testpmd can't be used as a guest loopback. This is useful in case, that other guest +loopback applications (e.g. buildin or l2fwd) are used. + +.. _VSPERF installation scripts: http://artifacts.opnfv.org/vswitchperf/docs/configguide/installation.html#other-requirements + Configuration of GUEST options ------------------------------ |