doc: announce ABI change for ring structure

[dpdk.git] / doc / guides / tools / testeventdev.rst

..  SPDX-License-Identifier: BSD-3-Clause
    Copyright(c) 2017 Cavium, Inc

dpdk-test-eventdev Application
==============================

The ``dpdk-test-eventdev`` tool is a Data Plane Development Kit (DPDK)
application that allows exercising various eventdev use cases.
This application has a generic framework to add new eventdev based test cases to
verify functionality and measure the performance parameters of DPDK eventdev
devices.

Compiling the Application
-------------------------

**Build the application**

Execute the ``dpdk-setup.sh`` script to build the DPDK library together with the
``dpdk-test-eventdev`` application.

Initially, the user must select a DPDK target to choose the correct target type
and compiler options to use when building the libraries.
The user must have all libraries, modules, updates and compilers installed
in the system prior to this,
as described in the earlier chapters in this Getting Started Guide.

Running the Application
-----------------------

The application has a number of command line options:

.. code-block:: console

   dpdk-test-eventdev [EAL Options] -- [application options]

EAL Options
~~~~~~~~~~~

The following are the EAL command-line options that can be used in conjunction
with the ``dpdk-test-eventdev`` application.
See the DPDK Getting Started Guides for more information on these options.

*   ``-c <COREMASK>`` or ``-l <CORELIST>``

        Set the hexadecimal bitmask of the cores to run on. The corelist is a
        list of cores to use.

*   ``--vdev <driver><id>``

        Add a virtual eventdev device.

Application Options
~~~~~~~~~~~~~~~~~~~

The following are the application command-line options:

* ``--verbose``

        Set verbose level. Default is 1. Value > 1 displays more details.

* ``--dev <n>``

        Set the device id of the event device.

* ``--test <name>``

        Set test name, where ``name`` is one of the following::

         order_queue
         order_atq
         perf_queue
         perf_atq

* ``--socket_id <n>``

        Set the socket id of the application resources.

* ``--pool-sz <n>``

        Set the number of mbufs to be allocated from the mempool.

* ``--plcores <CORELIST>``

        Set the list of cores to be used as producers.

* ``--wlcores <CORELIST>``

        Set the list of cores to be used as workers.

* ``--stlist <type_list>``

        Set the scheduled type of each stage where ``type_list`` size
        determines the number of stages used in the test application.
        Each type_list member can be one of the following::

            P or p : Parallel schedule type
            O or o : Ordered schedule type
            A or a : Atomic schedule type

        Application expects the ``type_list`` in comma separated form (i.e. ``--stlist o,a,a,a``)

* ``--nb_flows <n>``

        Set the number of flows to produce.

* ``--nb_pkts <n>``

        Set the number of packets to produce. 0 implies no limit.

* ``--worker_deq_depth <n>``

        Set the dequeue depth of the worker.

* ``--fwd_latency``

        Perform forward latency measurement.

* ``--queue_priority``

        Enable queue priority.


Eventdev Tests
--------------

ORDER_QUEUE Test
~~~~~~~~~~~~~~~~

This is a functional test case that aims at testing the following:

#. Verify the ingress order maintenance.
#. Verify the exclusive(atomic) access to given atomic flow per eventdev port.

.. _table_eventdev_order_queue_test:

.. table:: Order queue test eventdev configuration.

   +---+--------------+----------------+------------------------+
   | # | Items        | Value          | Comments               |
   |   |              |                |                        |
   +===+==============+================+========================+
   | 1 | nb_queues    | 2              | q0(ordered), q1(atomic)|
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 2 | nb_producers | 1              |                        |
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 3 | nb_workers   | >= 1           |                        |
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 4 | nb_ports     | nb_workers +   | Workers use port 0 to  |
   |   |              | 1              | port n-1. Producer uses|
   |   |              |                | port n                 |
   +---+--------------+----------------+------------------------+

.. _figure_eventdev_order_queue_test:

.. figure:: img/eventdev_order_queue_test.*

   order queue test operation.

The order queue test configures the eventdev with two queues and an event
producer to inject the events to q0(ordered) queue. Both q0(ordered) and
q1(atomic) are linked to all the workers.

The event producer maintains a sequence number per flow and injects the events
to the ordered queue. The worker receives the events from ordered queue and
forwards to atomic queue. Since the events from an ordered queue can be
processed in parallel on the different workers, the ingress order of events
might have changed on the downstream atomic queue enqueue. On enqueue to the
atomic queue, the eventdev PMD driver reorders the event to the original
ingress order(i.e producer ingress order).

When the event is dequeued from the atomic queue by the worker, this test
verifies the expected sequence number of associated event per flow by comparing
the free running expected sequence number per flow.

Application options
^^^^^^^^^^^^^^^^^^^

Supported application command line options are following::

   --verbose
   --dev
   --test
   --socket_id
   --pool_sz
   --plcores
   --wlcores
   --nb_flows
   --nb_pkts
   --worker_deq_depth

Example
^^^^^^^

Example command to run order queue test:

.. code-block:: console

   sudo build/app/dpdk-test-eventdev --vdev=event_sw0 -- \
                --test=order_queue --plcores 1 --wlcores 2,3


ORDER_ATQ Test
~~~~~~~~~~~~~~

This test verifies the same aspects of ``order_queue`` test, the difference is
the number of queues used, this test operates on a single ``all types queue(atq)``
instead of two different queues for ordered and atomic.

.. _table_eventdev_order_atq_test:

.. table:: Order all types queue test eventdev configuration.

   +---+--------------+----------------+------------------------+
   | # | Items        | Value          | Comments               |
   |   |              |                |                        |
   +===+==============+================+========================+
   | 1 | nb_queues    | 1              | q0(all types queue)    |
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 2 | nb_producers | 1              |                        |
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 3 | nb_workers   | >= 1           |                        |
   |   |              |                |                        |
   +---+--------------+----------------+------------------------+
   | 4 | nb_ports     | nb_workers +   | Workers use port 0 to  |
   |   |              | 1              | port n-1.Producer uses |
   |   |              |                | port n.                |
   +---+--------------+----------------+------------------------+

.. _figure_eventdev_order_atq_test:

.. figure:: img/eventdev_order_atq_test.*

   order all types queue test operation.

Application options
^^^^^^^^^^^^^^^^^^^

Supported application command line options are following::

   --verbose
   --dev
   --test
   --socket_id
   --pool_sz
   --plcores
   --wlcores
   --nb_flows
   --nb_pkts
   --worker_deq_depth

Example
^^^^^^^

Example command to run order ``all types queue`` test:

.. code-block:: console

   sudo build/app/dpdk-test-eventdev --vdev=event_octeontx -- \
                        --test=order_atq --plcores 1 --wlcores 2,3


PERF_QUEUE Test
~~~~~~~~~~~~~~~

This is a performance test case that aims at testing the following:

#. Measure the number of events can be processed in a second.
#. Measure the latency to forward an event.

.. _table_eventdev_perf_queue_test:

.. table:: Perf queue test eventdev configuration.

   +---+--------------+----------------+-----------------------------------------+
   | # | Items        | Value          | Comments                                |
   |   |              |                |                                         |
   +===+==============+================+=========================================+
   | 1 | nb_queues    | nb_producers * | Queues will be configured based on the  |
   |   |              | nb_stages      | user requested sched type list(--stlist)|
   +---+--------------+----------------+-----------------------------------------+
   | 2 | nb_producers | >= 1           | Selected through --plcores command line |
   |   |              |                | argument.                               |
   +---+--------------+----------------+-----------------------------------------+
   | 3 | nb_workers   | >= 1           | Selected through --wlcores command line |
   |   |              |                | argument                                |
   +---+--------------+----------------+-----------------------------------------+
   | 4 | nb_ports     | nb_workers +   | Workers use port 0 to port n-1.         |
   |   |              | nb_producers   | Producers use port n to port p          |
   +---+--------------+----------------+-----------------------------------------+

.. _figure_eventdev_perf_queue_test:

.. figure:: img/eventdev_perf_queue_test.*

   perf queue test operation.

The perf queue test configures the eventdev with Q queues and P ports, where
Q and P is a function of the number of workers, the number of producers and
number of stages as mentioned in :numref:`table_eventdev_perf_queue_test`.

The user can choose the number of workers, the number of producers and number of
stages through the ``--wlcores``, ``--plcores`` and the ``--stlist`` application
command line arguments respectively.

The producer(s) injects the events to eventdev based the first stage sched type
list requested by the user through ``--stlist`` the command line argument.

Based on the number of stages to process(selected through ``--stlist``),
The application forwards the event to next upstream queue and terminates when it
reaches the last stage in the pipeline. On event termination, application
increments the number events processed and print periodically in one second
to get the number of events processed in one second.

When ``--fwd_latency`` command line option selected, the application inserts
the timestamp in the event on the first stage and then on termination, it
updates the number of cycles to forward a packet. The application uses this
value to compute the average latency to a forward packet.

Application options
^^^^^^^^^^^^^^^^^^^

Supported application command line options are following::

        --verbose
        --dev
        --test
        --socket_id
        --pool_sz
        --plcores
        --wlcores
        --stlist
        --nb_flows
        --nb_pkts
        --worker_deq_depth
        --fwd_latency
        --queue_priority

Example
^^^^^^^

Example command to run perf queue test:

.. code-block:: console

   sudo build/app/dpdk-test-eventdev -c 0xf -s 0x1 --vdev=event_sw0 -- \
        --test=perf_queue --plcores=2 --wlcore=3 --stlist=p --nb_pkts=0


PERF_ATQ Test
~~~~~~~~~~~~~~~

This is a performance test case that aims at testing the following with
``all types queue`` eventdev scheme.

#. Measure the number of events can be processed in a second.
#. Measure the latency to forward an event.

.. _table_eventdev_perf_atq_test:

.. table:: Perf all types queue test eventdev configuration.

   +---+--------------+----------------+-----------------------------------------+
   | # | Items        | Value          | Comments                                |
   |   |              |                |                                         |
   +===+==============+================+=========================================+
   | 1 | nb_queues    | nb_producers   | Queues will be configured based on the  |
   |   |              |                | user requested sched type list(--stlist)|
   +---+--------------+----------------+-----------------------------------------+
   | 2 | nb_producers | >= 1           | Selected through --plcores command line |
   |   |              |                | argument.                               |
   +---+--------------+----------------+-----------------------------------------+
   | 3 | nb_workers   | >= 1           | Selected through --wlcores command line |
   |   |              |                | argument                                |
   +---+--------------+----------------+-----------------------------------------+
   | 4 | nb_ports     | nb_workers +   | Workers use port 0 to port n-1.         |
   |   |              | nb_producers   | Producers use port n to port p          |
   +---+--------------+----------------+-----------------------------------------+

.. _figure_eventdev_perf_atq_test:

.. figure:: img/eventdev_perf_atq_test.*

   perf all types queue test operation.


The ``all types queues(atq)`` perf test configures the eventdev with Q queues
and P ports, where Q and P is a function of the number of workers and number of
producers as mentioned in :numref:`table_eventdev_perf_atq_test`.


The atq queue test functions as same as ``perf_queue`` test. The difference
is, It uses, ``all type queue scheme`` instead of separate queues for each
stage and thus reduces the number of queues required to realize the use case
and enables flow pinning as the event does not move to the next queue.


Application options
^^^^^^^^^^^^^^^^^^^

Supported application command line options are following::

        --verbose
        --dev
        --test
        --socket_id
        --pool_sz
        --plcores
        --wlcores
        --stlist
        --nb_flows
        --nb_pkts
        --worker_deq_depth
        --fwd_latency

Example
^^^^^^^

Example command to run perf ``all types queue`` test:

.. code-block:: console

   sudo build/app/dpdk-test-eventdev --vdev=event_octeontx -- \
                --test=perf_atq --plcores=2 --wlcore=3 --stlist=p --nb_pkts=0