[dpdk-dev] [PATCH] doc: add meson ut enhancements in prog guide

[Hari Kumar Vemula <hari.kumarx.vemula@intel.com>]

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Add a programmer's guide section for meson ut enhancements

Signed-off-by: Hari Kumar Vemula <hari.kumarx.vemula@intel.com>
---
 doc/guides/prog_guide/index.rst               |   1 +
 .../prog_guide/meson_ut_enhancements.rst      | 158 ++++++++++++++++++
 2 files changed, 159 insertions(+)
 create mode 100644 doc/guides/prog_guide/meson_ut_enhancements.rst

diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst
index ba8c1f6ad..41971e1cf 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -57,6 +57,7 @@ Programmer's Guide
     source_org
     dev_kit_build_system
     dev_kit_root_make_help
+    meson_ut_enhancements
     extend_dpdk
     build_app
     ext_app_lib_make_help
diff --git a/doc/guides/prog_guide/meson_ut_enhancements.rst b/doc/guides/prog_guide/meson_ut_enhancements.rst
new file mode 100644
index 000000000..328adda28
--- /dev/null
+++ b/doc/guides/prog_guide/meson_ut_enhancements.rst
@@ -0,0 +1,158 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2014-2018 Intel Corporation.
+
+.. _Meson_UT_Enhancements:
+
+Meson_UT_Enhancements
+=====================
+
+The meson build support for unit tests is now available and the more enhancements are done to the build system
+to classify unit tests under different categories. The build `test/test/meson.build` file has been
+modified for these enhancements. This document will further down describe the below list.
+
+*  Building and Running the unit tests.
+*  Grouping of testcases.
+*  Parallel and non parallel tests.
+*  Test suites.
+*  How to run different test suites.
+*  Support for skipped tests.
+
+
+Building and Running the unit tests
+-----------------------------------
+
+*  Create the meson build output folder using command.
+
+   ``$meson <build_dir>``
+
+*  Enter into build output folder, which was created by above command.
+
+   ``$cd build``
+
+*  Compile DPDK using `$ninja`.
+   The output file of the build will be available in meson build folder.
+   After successful ninja, binary `dpdk-test` is created in `build/test/test/`.
+
+*  Run the unit testcases.
+
+   ``$ninja test`` (or) ``$meson test``
+
+*  To rebuild the build directory, after any changes to meson.build.
+
+   ``$meson configure``
+
+*   To run specific test case via meson command.
+
+   ``$meson test <test case>`` (or) ``$ninja test <test case>``
+
+
+Grouping of testcases
+---------------------
+
+Testcases has been grouped into below four different groups based on conditions
+of time duration and performance of the individual testcase.
+
+*  fast_parallel_test_names
+*  fast_non_parallel_test_names
+*  perf_test_names
+*  driver_test_names
+*  dump_test_names
+
+Parallel and non parallel tests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Unless specified the meson will run all unit tests as parallel by default.
+So the test cases are categorized into parallel and non parallel tests purely
+based test case functionality using `is_parallel` argument of `test()`
+in meson.build. Test cases marked with `is_parallel : true` will run in
+parallel and tests marked with `is_parallel : false` will run in non-parallel.
+While non-parallel test is running, any other test should not be run.
+Parallel and non parallel test cases are grouped under the
+`fast_parallel_test_names` and `fast_non_parallel_test_names`.
+
+Test suites
+~~~~~~~~~~~
+
+Test groups are considered as "suite” in `meson.build` and can be provided
+as argument to `test()` as  `suite ‘project_name:label’`
+
+    Ex: ``suite ‘DPDK:fast-tests’``
+
+Running different test suites
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Below are commands to run testcases using option `suite`
+
+*  Test cases from the groups `fast_parallel_test_names` and `fast_non_parallel_test_names`
+   are run under 10seconds and below is the meson command to run them.
+
+   ``$meson test --suite DPDK:fast-tests``
+
+*  Test cases from the group `perf_test_names` are run under 600 seconds
+   and below is the meson command to run them.
+
+   ``$meson test --suite DPDK:perf-tests``
+
+*  Test cases from the group `driver_test_names` are run under 600 seconds
+   and below is the meson command to run them.
+
+   ``$meson test --suite DPDK:driver-tests``
+
+*  Test cases from the group `dump_test_names` are run under 600 seconds
+   and below is the meson command to run them.
+
+   ``$meson test --suite DPDK:dump-tests``
+
+
+Skipped testcases
+-----------------
+
+Some unit test cases have dependency on external libraries, driver modules or
+config flags, without which the test cases cannot be run, such test cases
+should return TEST_SKIPPED when mentioned dependencies are not enabled. To make
+test cases run user should enable relevant dependencies. Below are the few
+current scenarios when test cases are skipped:
+
+#. External library dependency paths are not set.
+#. Config flag for the dependent library is not enabled.
+#. Dependent driver modules are not installed on the system.
+
+Dependent library paths can be set using below
+
+*  Single path ``export LIBRARY_PATH=path``
+
+*  Multiple paths ``export LIBRARY_PATH=path1:path2:path3``
+
+Dependent library headers path can be exported as below.
+
+*  Single path ``$CFLAGS=-I/path meson build``
+
+*  Multiple paths ``$CFLAGS=-I/path1 -I/path2 meson build``
+
+Below examples shows how to export libraries and their header paths.
+
+To export single library at a time.
+
+        ``$export LIBRARY_PATH=/root/wireless_libs/zuc/``
+        ``$CFLAGS=-I/root/wireless_libs/zuc/include meson build``
+
+To export multiple libraries at a time.
+
+        ``$export LIBRARY_PATH=/root/wireless_libs/zuc/:/root/wireless_libs/`` \
+                                                    ``libsso_kasumi/build/``
+        ``$CFLAGS=-I/root/wireless_libs/zuc/include -I/root/wireless_libs/`` \
+                                        ``libsso_kasumi/include meson build``
+
+
+
+Commands to run meson UTs
+-------------------------
+
+*   To run all test cases
+       ``$meson test``
+*   To run specific test
+       ``$meson test testcase_name``
+        Ex:``$meson test acl_autotest``
+*   To run specific test suite
+       ``$meson test --suite DPDK:suite_name``
+        Ex:``$meson test --suite DPDK:fast-tests``
-- 
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