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References: <20230610005149.1145665-1-rmoar@google.com> <20230610005149.1145665-2-rmoar@google.com>
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From:   David Gow <davidgow@google.com>
Date:   Sat, 10 Jun 2023 16:29:11 +0800
Message-ID: <CABVgOS=PS1VAX7KwKE77foM0ZVbenKwJ25uZR1XOUhwwyJ4Ydw@mail.gmail.com>
Subject: Re: [RFC v1 1/6] kunit: Add test attributes API structure
To:     Rae Moar <rmoar@google.com>
Cc:     shuah@kernel.org, dlatypov@google.com, brendan.higgins@linux.dev,
        linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com,
        linux-kernel@vger.kernel.org, keescook@chromium.org,
        linux-hardening@vger.kernel.org, jstultz@google.com,
        tglx@linutronix.de, sboyd@kernel.org
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On Sat, 10 Jun 2023 at 08:52, Rae Moar <rmoar@google.com> wrote:
>
> Add the basic structure of the test attribute API to KUnit, which can be
> used to save and access test associated data.
>
> Add attributes.c and attributes.h to hold associated structs and functions
> for the API.
>
> Create a struct that holds a variety of associated helper functions for
> each test attribute. These helper functions will be used to get the
> attribute value, convert the value to a string, and filter based on the
> value. This struct is flexible by design to allow for attributes of
> numerous types and contexts.
>
> Add a method to print test attributes in the format of "# [<test_name if
> not suite>.]<attribute_name>: <attribute_value>".
>
> Example for a suite: "# speed: slow"
>
> Example for a test case: "# test_case.speed: very_slow"
>
> Use this method to report attributes in the KTAP output and _list_tests
> output.

Can we have a link to the draft KTAP spec for this?

Also, by _list_tests, I assume we're talking about the
kunit.action=list option. That's been an "internal" feature for the
kunit script thus far, but kunit.py doesn't use this attribute info
anywhere yet, apart from to print it out via --list_tests. Maybe we
should make including the attributes optional, as the raw list of
tests is currently more useful.

>
> In test.h, add fields and associated helper functions to test cases and
> suites to hold user-inputted test attributes.
>
> Signed-off-by: Rae Moar <rmoar@google.com>
> ---
>  include/kunit/attributes.h | 19 +++++++++++
>  include/kunit/test.h       | 33 +++++++++++++++++++
>  lib/kunit/Makefile         |  3 +-
>  lib/kunit/attributes.c     | 65 ++++++++++++++++++++++++++++++++++++++
>  lib/kunit/executor.c       | 10 +++++-
>  lib/kunit/test.c           | 17 ++++++----
>  6 files changed, 138 insertions(+), 9 deletions(-)
>  create mode 100644 include/kunit/attributes.h
>  create mode 100644 lib/kunit/attributes.c
>
> diff --git a/include/kunit/attributes.h b/include/kunit/attributes.h
> new file mode 100644
> index 000000000000..9fcd184cce36
> --- /dev/null
> +++ b/include/kunit/attributes.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * KUnit API to save and access test attributes
> + *
> + * Copyright (C) 2023, Google LLC.
> + * Author: Rae Moar <rmoar@google.com>
> + */
> +
> +#ifndef _KUNIT_ATTRIBUTES_H
> +#define _KUNIT_ATTRIBUTES_H
> +
> +/*
> + * Print all test attributes for a test case or suite.
> + * Output format for test cases: "# <test_name>.<attribute>: <value>"
> + * Output format for test suites: "# <attribute>: <value>"
> + */
> +void kunit_print_attr(void *test_or_suite, bool is_test, unsigned int test_level);
> +
> +#endif /* _KUNIT_ATTRIBUTES_H */
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 23120d50499e..1fc9155988e9 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -63,12 +63,16 @@ enum kunit_status {
>         KUNIT_SKIPPED,
>  };
>
> +/* Holds attributes for each test case and suite */
> +struct kunit_attributes {};

This is a placeholder as attributes won't be included until patch 2, right?

> +
>  /**
>   * struct kunit_case - represents an individual test case.
>   *
>   * @run_case: the function representing the actual test case.
>   * @name:     the name of the test case.
>   * @generate_params: the generator function for parameterized tests.
> + * @attr:     the attributes associated with the test
>   *
>   * A test case is a function with the signature,
>   * ``void (*)(struct kunit *)``
> @@ -104,6 +108,7 @@ struct kunit_case {
>         void (*run_case)(struct kunit *test);
>         const char *name;
>         const void* (*generate_params)(const void *prev, char *desc);
> +       struct kunit_attributes attr;
>
>         /* private: internal use only. */
>         enum kunit_status status;
> @@ -133,6 +138,18 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
>   */
>  #define KUNIT_CASE(test_name) { .run_case = test_name, .name = #test_name }
>
> +/**
> + * KUNIT_CASE_ATTR - A helper for creating a &struct kunit_case
> + * with attributes
> + *
> + * @test_name: a reference to a test case function.
> + * @attributes: a reference to a struct kunit_attributes object containing
> + * test attributes
> + */
> +#define KUNIT_CASE_ATTR(test_name, attributes)                 \
> +               { .run_case = test_name, .name = #test_name,    \
> +                 .attr = attributes }
> +

This is a bit awkward, as the attributes are either entirely unset
(i.e., zero-initialised), or have to be specified here. I assume the
plan is to use designated initialisers, e.g.:
KUNIT_CASE_ATTR(foo_test, {.speed = KUNIT_SPEED_SLOW, .flaky = true}).

That at least makes it reasonably user-friendly, though the whole need
to make sure zero-initialised values are the defaults is a bit icky.


>  /**
>   * KUNIT_CASE_PARAM - A helper for creation a parameterized &struct kunit_case
>   *
> @@ -154,6 +171,20 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
>                 { .run_case = test_name, .name = #test_name,    \
>                   .generate_params = gen_params }
>
> +/**
> + * KUNIT_CASE_PARAM_ATTR - A helper for creating a parameterized &struct
> + * kunit_case with attributes
> + *
> + * @test_name: a reference to a test case function.
> + * @gen_params: a reference to a parameter generator function.
> + * @attributes: a reference to a struct kunit_attributes object containing
> + * test attributes
> + */
> +#define KUNIT_CASE_PARAM_ATTR(test_name, gen_params, attributes)       \
> +               { .run_case = test_name, .name = #test_name,    \
> +                 .generate_params = gen_params,                                \
> +                 .attr = attributes }
> +
>  /**
>   * struct kunit_suite - describes a related collection of &struct kunit_case
>   *
> @@ -163,6 +194,7 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
>   * @init:      called before every test case.
>   * @exit:      called after every test case.
>   * @test_cases:        a null terminated array of test cases.
> + * @attr:      the attributes associated with the test suite
>   *
>   * A kunit_suite is a collection of related &struct kunit_case s, such that
>   * @init is called before every test case and @exit is called after every
> @@ -182,6 +214,7 @@ struct kunit_suite {
>         int (*init)(struct kunit *test);
>         void (*exit)(struct kunit *test);
>         struct kunit_case *test_cases;
> +       struct kunit_attributes attr;
>
>         /* private: internal use only */
>         char status_comment[KUNIT_STATUS_COMMENT_SIZE];
> diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
> index cb417f504996..46f75f23dfe4 100644
> --- a/lib/kunit/Makefile
> +++ b/lib/kunit/Makefile
> @@ -6,7 +6,8 @@ kunit-objs +=                           test.o \
>                                         string-stream.o \
>                                         assert.o \
>                                         try-catch.o \
> -                                       executor.o
> +                                       executor.o \
> +                                       attributes.o
>
>  ifeq ($(CONFIG_KUNIT_DEBUGFS),y)
>  kunit-objs +=                          debugfs.o
> diff --git a/lib/kunit/attributes.c b/lib/kunit/attributes.c
> new file mode 100644
> index 000000000000..0ea641be795f
> --- /dev/null
> +++ b/lib/kunit/attributes.c
> @@ -0,0 +1,65 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit API to save and access test attributes
> + *
> + * Copyright (C) 2023, Google LLC.
> + * Author: Rae Moar <rmoar@google.com>
> + */
> +
> +#include <kunit/test.h>
> +#include <kunit/attributes.h>
> +
> +/**
> + * struct kunit_attr - represents a test attribute and holds flexible
> + * helper functions to interact with attribute.
> + *
> + * @name: name of test attribute, eg. speed
> + * @get_attr: function to return attribute value given a test
> + * @to_string: function to return string representation of given
> + * attribute value
> + * @filter: function to indicate whether a given attribute value passes a
> + * filter
> + */
> +struct kunit_attr {
> +       const char *name;
> +       void *(*get_attr)(void *test_or_suite, bool is_test);
> +       const char *(*to_string)(void *attr, bool *to_free);
> +       int (*filter)(void *attr, const char *input, int *err);
> +       void *attr_default;
> +};
> +
> +/* List of all Test Attributes */
> +
> +static struct kunit_attr kunit_attr_list[1] = {};
> +
> +/* Helper Functions to Access Attributes */
> +
> +void kunit_print_attr(void *test_or_suite, bool is_test, unsigned int test_level)
> +{
> +       int i;
> +       bool to_free;
> +       void *attr;
> +       const char *attr_name, *attr_str;
> +       struct kunit_suite *suite = is_test ? NULL : test_or_suite;
> +       struct kunit_case *test = is_test ? test_or_suite : NULL;
> +
> +       for (i = 0; i < ARRAY_SIZE(kunit_attr_list); i++) {
> +               attr = kunit_attr_list[i].get_attr(test_or_suite, is_test);
> +               if (attr) {
> +                       attr_name = kunit_attr_list[i].name;
> +                       attr_str = kunit_attr_list[i].to_string(attr, &to_free);
> +                       if (test) {
> +                               kunit_log(KERN_INFO, test, "%*s# %s.%s: %s",
> +                                       KUNIT_INDENT_LEN * test_level, "", test->name,
> +                                       attr_name, attr_str);
> +                       } else {
> +                               kunit_log(KERN_INFO, suite, "%*s# %s: %s",
> +                                       KUNIT_INDENT_LEN * test_level, "", attr_name, attr_str);
> +                       }
> +
> +                       /* Free to_string of attribute if needed */
> +                       if (to_free)
> +                               kfree(attr_str);
> +               }
> +       }
> +}
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> index 74982b83707c..767a84e32f06 100644
> --- a/lib/kunit/executor.c
> +++ b/lib/kunit/executor.c
> @@ -2,6 +2,7 @@
>
>  #include <linux/reboot.h>
>  #include <kunit/test.h>
> +#include <kunit/attributes.h>
>  #include <linux/glob.h>
>  #include <linux/moduleparam.h>
>
> @@ -180,10 +181,17 @@ static void kunit_exec_list_tests(struct suite_set *suite_set)
>         /* Hack: print a ktap header so kunit.py can find the start of KUnit output. */
>         pr_info("KTAP version 1\n");
>
> -       for (suites = suite_set->start; suites < suite_set->end; suites++)
> +       for (suites = suite_set->start; suites < suite_set->end; suites++) {
> +               /* Print suite name and suite attributes */
> +               pr_info("%s\n", (*suites)->name);
> +               kunit_print_attr((void *)(*suites), false, 0);
> +
> +               /* Print test case name and attributes in suite */
>                 kunit_suite_for_each_test_case((*suites), test_case) {
>                         pr_info("%s.%s\n", (*suites)->name, test_case->name);
> +                       kunit_print_attr((void *)test_case, true, 0);
>                 }
> +       }
>  }
>
>  int kunit_run_all_tests(void)
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 84e4666555c9..9ee55139ecd1 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -9,6 +9,7 @@
>  #include <kunit/resource.h>
>  #include <kunit/test.h>
>  #include <kunit/test-bug.h>
> +#include <kunit/attributes.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
> @@ -168,6 +169,13 @@ size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
>  }
>  EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
>
> +/* Currently supported test levels */
> +enum {
> +       KUNIT_LEVEL_SUITE = 0,
> +       KUNIT_LEVEL_CASE,
> +       KUNIT_LEVEL_CASE_PARAM,
> +};
> +
>  static void kunit_print_suite_start(struct kunit_suite *suite)
>  {
>         /*
> @@ -181,17 +189,11 @@ static void kunit_print_suite_start(struct kunit_suite *suite)
>         pr_info(KUNIT_SUBTEST_INDENT "KTAP version 1\n");
>         pr_info(KUNIT_SUBTEST_INDENT "# Subtest: %s\n",
>                   suite->name);
> +       kunit_print_attr((void *)suite, false, KUNIT_LEVEL_CASE);
>         pr_info(KUNIT_SUBTEST_INDENT "1..%zd\n",
>                   kunit_suite_num_test_cases(suite));
>  }
>
> -/* Currently supported test levels */
> -enum {
> -       KUNIT_LEVEL_SUITE = 0,
> -       KUNIT_LEVEL_CASE,
> -       KUNIT_LEVEL_CASE_PARAM,
> -};
> -
>  static void kunit_print_ok_not_ok(struct kunit *test,
>                                   unsigned int test_level,
>                                   enum kunit_status status,
> @@ -651,6 +653,7 @@ int kunit_run_tests(struct kunit_suite *suite)
>                         }
>                 }
>
> +               kunit_print_attr((void *)test_case, true, KUNIT_LEVEL_CASE);
>
>                 kunit_print_test_stats(&test, param_stats);
>
> --
> 2.41.0.162.gfafddb0af9-goog
>

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