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Message-ID: <202003171326.0EB9CC2@keescook>
Date: Tue, 17 Mar 2020 13:36:40 -0700
From: Kees Cook <keescook@...omium.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: shuah@...nel.org, luto@...capital.net, wad@...omium.org,
linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-team@...com, Tim.Bird@...y.com
Subject: Re: [PATCH v3 5/6] kselftest: add fixture parameters
On Mon, Mar 16, 2020 at 03:56:45PM -0700, Jakub Kicinski wrote:
> Allow users to pass parameters to fixtures.
>
> Each fixture will be evaluated for each of its parameter
> sets.
This commit log (and subject) needs to be reworded/expanded slightly.
Perhaps:
Subject: kselftest: add fixture variants
Allow users to build parameterized variants of fixtures.
If fixtures want variants, they call FIXTURE_VARIANT() to declare the
structure to fill for each variant. Each fixture will be re-run for each
of the variants defined by calling FIXTURE_VARIANT_ADD() with the
differing parameters initializing the structure.
Since tests are being re-run, additional initialization (steps,
no_print) is also added.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> --
> v3:
> - separate variant name out with a dot.
> ---
> Documentation/dev-tools/kselftest.rst | 3 +-
> tools/testing/selftests/kselftest_harness.h | 145 ++++++++++++++++----
> 2 files changed, 121 insertions(+), 27 deletions(-)
>
> diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
> index 61ae13c44f91..5d1f56fcd2e7 100644
> --- a/Documentation/dev-tools/kselftest.rst
> +++ b/Documentation/dev-tools/kselftest.rst
> @@ -301,7 +301,8 @@ Helpers
>
> .. kernel-doc:: tools/testing/selftests/kselftest_harness.h
> :functions: TH_LOG TEST TEST_SIGNAL FIXTURE FIXTURE_DATA FIXTURE_SETUP
> - FIXTURE_TEARDOWN TEST_F TEST_HARNESS_MAIN
> + FIXTURE_TEARDOWN TEST_F TEST_HARNESS_MAIN FIXTURE_VARIANT
> + FIXTURE_VARIANT_ADD
>
> Operators
> ---------
> diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> index 36ab1b92eb35..1a079afa2d01 100644
> --- a/tools/testing/selftests/kselftest_harness.h
> +++ b/tools/testing/selftests/kselftest_harness.h
> @@ -168,9 +168,15 @@
>
> #define __TEST_IMPL(test_name, _signal) \
> static void test_name(struct __test_metadata *_metadata); \
> + static inline void wrapper_##test_name( \
> + struct __test_metadata *_metadata, \
> + struct __fixture_variant_metadata *variant) \
> + { \
> + test_name(_metadata); \
> + } \
> static struct __test_metadata _##test_name##_object = \
> { .name = #test_name, \
> - .fn = &test_name, \
> + .fn = &wrapper_##test_name, \
> .fixture = &_fixture_global, \
> .termsig = _signal, \
> .timeout = TEST_TIMEOUT_DEFAULT, }; \
> @@ -214,6 +220,7 @@
> * populated and cleaned up using FIXTURE_SETUP() and FIXTURE_TEARDOWN().
> */
> #define FIXTURE(fixture_name) \
> + FIXTURE_VARIANT(fixture_name); \
> static struct __fixture_metadata _##fixture_name##_fixture_object = \
> { .name = #fixture_name, }; \
> static void __attribute__((constructor)) \
> @@ -245,7 +252,9 @@
> #define FIXTURE_SETUP(fixture_name) \
> void fixture_name##_setup( \
> struct __test_metadata __attribute__((unused)) *_metadata, \
> - FIXTURE_DATA(fixture_name) __attribute__((unused)) *self)
> + FIXTURE_DATA(fixture_name) __attribute__((unused)) *self, \
> + const FIXTURE_VARIANT(fixture_name) __attribute__((unused)) *variant)
> +
> /**
> * FIXTURE_TEARDOWN(fixture_name)
> * *_metadata* is included so that EXPECT_* and ASSERT_* work correctly.
> @@ -267,6 +276,58 @@
> struct __test_metadata __attribute__((unused)) *_metadata, \
> FIXTURE_DATA(fixture_name) __attribute__((unused)) *self)
>
> +/**
> + * FIXTURE_VARIANT(fixture_name) - Optionally called once per fixture
> + * to declare fixture variant
> + *
> + * @fixture_name: fixture name
> + *
> + * .. code-block:: c
> + *
> + * FIXTURE_VARIANT(datatype name) {
> + * type property1;
> + * ...
> + * };
> + *
> + * Defines type of constant parameters provided to FIXTURE_SETUP() and TEST_F()
> + * as *variant*. Variants allow the same tests to be run with different
> + * arguments.
> + */
> +#define FIXTURE_VARIANT(fixture_name) struct _fixture_variant_##fixture_name
> +
> +/**
> + * FIXTURE_VARIANT_ADD(fixture_name, variant_name) - Called once per fixture
> + * variant to setup and register the data
> + *
> + * @fixture_name: fixture name
> + * @variant_name: name of the parameter set
> + *
> + * .. code-block:: c
> + *
> + * FIXTURE_ADD(datatype name) {
> + * .property1 = val1;
> + * ...
> + * };
> + *
> + * Defines a variant of the test fixture, provided to FIXTURE_SETUP() and
> + * TEST_F() as *variant*. Tests of each fixture will be run once for each
> + * variant.
> + */
> +#define FIXTURE_VARIANT_ADD(fixture_name, variant_name) \
> + extern FIXTURE_VARIANT(fixture_name) \
> + _##fixture_name##_##variant_name##_variant; \
> + static struct __fixture_variant_metadata \
> + _##fixture_name##_##variant_name##_object = \
> + { .name = #variant_name, \
> + .data = &_##fixture_name##_##variant_name##_variant}; \
> + static void __attribute__((constructor)) \
> + _register_##fixture_name##_##variant_name(void) \
> + { \
> + __register_fixture_variant(&_##fixture_name##_fixture_object, \
> + &_##fixture_name##_##variant_name##_object); \
> + } \
> + FIXTURE_VARIANT(fixture_name) _##fixture_name##_##variant_name##_variant =
> +
> /**
> * TEST_F(fixture_name, test_name) - Emits test registration and helpers for
> * fixture-based test cases
> @@ -297,18 +358,20 @@
> #define __TEST_F_IMPL(fixture_name, test_name, signal, tmout) \
> static void fixture_name##_##test_name( \
> struct __test_metadata *_metadata, \
> - FIXTURE_DATA(fixture_name) *self); \
> + FIXTURE_DATA(fixture_name) *self, \
> + const FIXTURE_VARIANT(fixture_name) *variant); \
> static inline void wrapper_##fixture_name##_##test_name( \
> - struct __test_metadata *_metadata) \
> + struct __test_metadata *_metadata, \
> + struct __fixture_variant_metadata *variant) \
> { \
> /* fixture data is alloced, setup, and torn down per call. */ \
> FIXTURE_DATA(fixture_name) self; \
> memset(&self, 0, sizeof(FIXTURE_DATA(fixture_name))); \
> - fixture_name##_setup(_metadata, &self); \
> + fixture_name##_setup(_metadata, &self, variant->data); \
> /* Let setup failure terminate early. */ \
> if (!_metadata->passed) \
> return; \
> - fixture_name##_##test_name(_metadata, &self); \
> + fixture_name##_##test_name(_metadata, &self, variant->data); \
> fixture_name##_teardown(_metadata, &self); \
> } \
> static struct __test_metadata \
> @@ -326,7 +389,8 @@
> } \
> static void fixture_name##_##test_name( \
> struct __test_metadata __attribute__((unused)) *_metadata, \
> - FIXTURE_DATA(fixture_name) __attribute__((unused)) *self)
> + FIXTURE_DATA(fixture_name) __attribute__((unused)) *self, \
> + const FIXTURE_VARIANT(fixture_name) __attribute__((unused)) *variant)
>
> /**
> * TEST_HARNESS_MAIN - Simple wrapper to run the test harness
> @@ -661,10 +725,12 @@
>
> /* Contains all the information about a fixture */
> struct __test_metadata;
> +struct __fixture_variant_metadata;
>
> struct __fixture_metadata {
> const char *name;
> struct __test_metadata *tests;
> + struct __fixture_variant_metadata *variant;
> struct __fixture_metadata *prev, *next;
> } _fixture_global __attribute__((unused)) = {
> .name = "global",
> @@ -672,7 +738,6 @@ struct __fixture_metadata {
> };
>
> static struct __fixture_metadata *__fixture_list = &_fixture_global;
> -static unsigned int __fixture_count;
> static int __constructor_order;
>
> #define _CONSTRUCTOR_ORDER_FORWARD 1
> @@ -680,14 +745,27 @@ static int __constructor_order;
>
> static inline void __register_fixture(struct __fixture_metadata *f)
> {
> - __fixture_count++;
> __LIST_APPEND(__fixture_list, f);
> }
>
> +struct __fixture_variant_metadata {
> + const char *name;
> + const void *data;
> + struct __fixture_variant_metadata *prev, *next;
> +};
> +
> +static inline void
> +__register_fixture_variant(struct __fixture_metadata *f,
> + struct __fixture_variant_metadata *variant)
> +{
> + __LIST_APPEND(f->variant, variant);
> +}
> +
> /* Contains all the information for test execution and status checking. */
> struct __test_metadata {
> const char *name;
> - void (*fn)(struct __test_metadata *);
> + void (*fn)(struct __test_metadata *,
> + struct __fixture_variant_metadata *);
> struct __fixture_metadata *fixture;
> int termsig;
> int passed;
> @@ -698,9 +776,6 @@ struct __test_metadata {
> struct __test_metadata *prev, *next;
> };
>
> -/* Storage for the (global) tests to be run. */
> -static unsigned int __test_count;
> -
> /*
> * Since constructors are called in reverse order, reverse the test
> * list so tests are run in source declaration order.
> @@ -714,7 +789,6 @@ static inline void __register_test(struct __test_metadata *t)
> {
> struct __fixture_metadata *f = t->fixture;
>
> - __test_count++;
> __LIST_APPEND(f->tests, t);
> }
>
> @@ -729,21 +803,27 @@ static inline int __bail(int for_realz, bool no_print, __u8 step)
> }
>
> void __run_test(struct __fixture_metadata *f,
> + struct __fixture_variant_metadata *variant,
> struct __test_metadata *t)
> {
> pid_t child_pid;
> int status;
>
> + /* reset test struct */
> t->passed = 1;
> t->trigger = 0;
> - printf("[ RUN ] %s.%s\n", f->name, t->name);
> + t->step = 0;
> + t->no_print = 0;
I called this out in the commit log. This will need some merge attention
when my series for timeouts is merged too (since the new "timed_out"
will need to be initialized here too), but you don't have to worry about
that yet.
> +
> + printf("[ RUN ] %s%s%s.%s\n",
> + f->name, variant->name[0] ? "." : "", variant->name, t->name);
> alarm(t->timeout);
> child_pid = fork();
> if (child_pid < 0) {
> printf("ERROR SPAWNING TEST CHILD\n");
> t->passed = 0;
> } else if (child_pid == 0) {
> - t->fn(t);
> + t->fn(t, variant);
> /* return the step that failed or 0 */
> _exit(t->passed ? 0 : t->step);
> } else {
> @@ -785,31 +865,44 @@ void __run_test(struct __fixture_metadata *f,
> status);
> }
> }
> - printf("[ %4s ] %s.%s\n", (t->passed ? "OK" : "FAIL"),
> - f->name, t->name);
> + printf("[ %4s ] %s%s%s.%s\n", (t->passed ? "OK" : "FAIL"),
> + f->name, variant->name[0] ? "." : "", variant->name, t->name);
> alarm(0);
> }
>
> static int test_harness_run(int __attribute__((unused)) argc,
> char __attribute__((unused)) **argv)
> {
> + struct __fixture_variant_metadata no_variant = { .name = "", };
> + struct __fixture_variant_metadata *v;
> struct __fixture_metadata *f;
> struct __test_metadata *t;
> int ret = 0;
> + unsigned int case_count = 0, test_count = 0;
> unsigned int count = 0;
> unsigned int pass_count = 0;
>
> + for (f = __fixture_list; f; f = f->next) {
> + for (v = f->variant ?: &no_variant; v; v = v->next) {
> + case_count++;
> + for (t = f->tests; t; t = t->next)
> + test_count++;
> + }
> + }
> +
> /* TODO(wad) add optional arguments similar to gtest. */
> printf("[==========] Running %u tests from %u test cases.\n",
> - __test_count, __fixture_count + 1);
> + test_count, case_count);
> for (f = __fixture_list; f; f = f->next) {
> - for (t = f->tests; t; t = t->next) {
> - count++;
> - __run_test(f, t);
> - if (t->passed)
> - pass_count++;
> - else
> - ret = 1;
> + for (v = f->variant ?: &no_variant; v; v = v->next) {
> + for (t = f->tests; t; t = t->next) {
> + count++;
> + __run_test(f, v, t);
> + if (t->passed)
> + pass_count++;
> + else
> + ret = 1;
> + }
> }
> }
> printf("[==========] %u / %u tests passed.\n", pass_count, count);
> --
> 2.24.1
>
Otherwise, with those things fixed, yes:
Acked-by: Kees Cook <keescook@...omium.org>
--
Kees Cook
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