[Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[Arpitha Raghunandan]

Converts test lib/test_hexdump.c to KUnit.
More information about KUnit can be found at
https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
KUnit provides a common framework for unit tests in the kernel.

Signed-off-by: Arpitha Raghunandan <98.arpi@gmail.com>
---
 lib/Kconfig.debug                       |  7 ++-
 lib/Makefile                            |  2 +-
 lib/{test_hexdump.c => hexdump_kunit.c} | 81 ++++++++++---------------
 3 files changed, 36 insertions(+), 54 deletions(-)
 rename lib/{test_hexdump.c => hexdump_kunit.c} (74%)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a164785c3b48..20efea177e02 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2003,9 +2003,6 @@ config ASYNC_RAID6_TEST
 
 	  If unsure, say N.
 
-config TEST_HEXDUMP
-	tristate "Test functions located in the hexdump module at runtime"
-
 config TEST_STRING_HELPERS
 	tristate "Test functions located in the string_helpers module at runtime"
 
@@ -2224,6 +2221,10 @@ config LINEAR_RANGES_TEST
 
 	  If unsure, say N.
 
+config HEXDUMP_KUNIT_TEST
+	tristate "KUnit test for functions located in the hexdump module at runtime"
+	depends on KUNIT
+
 config TEST_UDELAY
 	tristate "udelay test driver"
 	help
diff --git a/lib/Makefile b/lib/Makefile
index 435f7f13b8aa..3819d42a4681 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -54,7 +54,6 @@ obj-$(CONFIG_STRING_SELFTEST) += test_string.o
 obj-y += string_helpers.o
 obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
 obj-y += hexdump.o
-obj-$(CONFIG_TEST_HEXDUMP) += test_hexdump.o
 obj-y += kstrtox.o
 obj-$(CONFIG_FIND_BIT_BENCHMARK) += find_bit_benchmark.o
 obj-$(CONFIG_TEST_BPF) += test_bpf.o
@@ -346,3 +345,4 @@ obj-$(CONFIG_PLDMFW) += pldmfw/
 # KUnit tests
 obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
 obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
+obj-$(CONFIG_HEXDUMP_KUNIT_TEST) += hexdump_kunit.o
diff --git a/lib/test_hexdump.c b/lib/hexdump_kunit.c
similarity index 74%
rename from lib/test_hexdump.c
rename to lib/hexdump_kunit.c
index 5144899d3c6b..8f8d80114a92 100644
--- a/lib/test_hexdump.c
+++ b/lib/hexdump_kunit.c
@@ -3,6 +3,7 @@
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <kunit/test.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -61,10 +62,7 @@ static const char * const test_data_8_be[] __initconst = {
 
 #define FILL_CHAR	'#'
 
-static unsigned total_tests __initdata;
-static unsigned failed_tests __initdata;
-
-static void __init test_hexdump_prepare_test(size_t len, int rowsize,
+static void test_hexdump_prepare_test(size_t len, int rowsize,
 					     int groupsize, char *test,
 					     size_t testlen, bool ascii)
 {
@@ -122,14 +120,12 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 
 #define TEST_HEXDUMP_BUF_SIZE		(32 * 3 + 2 + 32 + 1)
 
-static void __init test_hexdump(size_t len, int rowsize, int groupsize,
-				bool ascii)
+static void test_hexdump(struct kunit *kunittest, size_t len, int rowsize,
+				int groupsize, bool ascii)
 {
 	char test[TEST_HEXDUMP_BUF_SIZE];
 	char real[TEST_HEXDUMP_BUF_SIZE];
 
-	total_tests++;
-
 	memset(real, FILL_CHAR, sizeof(real));
 	hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
 			   ascii);
@@ -138,28 +134,23 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
 	test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
 				  ascii);
 
-	if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
-		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
-		pr_err("Result: '%s'\n", real);
-		pr_err("Expect: '%s'\n", test);
-		failed_tests++;
-	}
+	KUNIT_EXPECT_EQ(kunittest, 0, memcmp(test, real, TEST_HEXDUMP_BUF_SIZE));
 }
 
-static void __init test_hexdump_set(int rowsize, bool ascii)
+static void test_hexdump_set(struct kunit *test, int rowsize, bool ascii)
 {
 	size_t d = min_t(size_t, sizeof(data_b), rowsize);
 	size_t len = get_random_int() % d + 1;
 
-	test_hexdump(len, rowsize, 4, ascii);
-	test_hexdump(len, rowsize, 2, ascii);
-	test_hexdump(len, rowsize, 8, ascii);
-	test_hexdump(len, rowsize, 1, ascii);
+	test_hexdump(test, len, rowsize, 4, ascii);
+	test_hexdump(test, len, rowsize, 2, ascii);
+	test_hexdump(test, len, rowsize, 8, ascii);
+	test_hexdump(test, len, rowsize, 1, ascii);
 }
 
-static void __init test_hexdump_overflow(size_t buflen, size_t len,
-					 int rowsize, int groupsize,
-					 bool ascii)
+static void test_hexdump_overflow(struct kunit *kunittest, size_t buflen,
+					size_t len, int rowsize,
+					int groupsize, bool ascii)
 {
 	char test[TEST_HEXDUMP_BUF_SIZE];
 	char buf[TEST_HEXDUMP_BUF_SIZE];
@@ -167,8 +158,6 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 	int ae, he, e, f, r;
 	bool a;
 
-	total_tests++;
-
 	memset(buf, FILL_CHAR, sizeof(buf));
 
 	r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
@@ -196,16 +185,10 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 
 	buf[sizeof(buf) - 1] = '\0';
 
-	if (!a) {
-		pr_err("Len: %zu buflen: %zu strlen: %zu\n",
-			len, buflen, strnlen(buf, sizeof(buf)));
-		pr_err("Result: %d '%s'\n", r, buf);
-		pr_err("Expect: %d '%s'\n", e, test);
-		failed_tests++;
-	}
+	KUNIT_EXPECT_NE(kunittest, 0, a);
 }
 
-static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
+static void test_hexdump_overflow_set(struct kunit *test, size_t buflen, bool ascii)
 {
 	unsigned int i = 0;
 	int rs = (get_random_int() % 2 + 1) * 16;
@@ -214,43 +197,41 @@ static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
 		int gs = 1 << i;
 		size_t len = get_random_int() % rs + gs;
 
-		test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
+		test_hexdump_overflow(test, buflen, rounddown(len, gs), rs, gs, ascii);
 	} while (i++ < 3);
 }
 
-static int __init test_hexdump_init(void)
+static void test_hexdump_init(struct kunit *test)
 {
 	unsigned int i;
 	int rowsize;
 
 	rowsize = (get_random_int() % 2 + 1) * 16;
 	for (i = 0; i < 16; i++)
-		test_hexdump_set(rowsize, false);
+		test_hexdump_set(test, rowsize, false);
 
 	rowsize = (get_random_int() % 2 + 1) * 16;
 	for (i = 0; i < 16; i++)
-		test_hexdump_set(rowsize, true);
+		test_hexdump_set(test, rowsize, true);
 
 	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
-		test_hexdump_overflow_set(i, false);
+		test_hexdump_overflow_set(test, i, false);
 
 	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
-		test_hexdump_overflow_set(i, true);
+		test_hexdump_overflow_set(test, i, true);
+}
 
-	if (failed_tests == 0)
-		pr_info("all %u tests passed\n", total_tests);
-	else
-		pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
+static struct kunit_case hexdump_test_cases[] = {
+	KUNIT_CASE(test_hexdump_init),
+	{}
+};
 
-	return failed_tests ? -EINVAL : 0;
-}
-module_init(test_hexdump_init);
+static struct kunit_suite hexdump_test_suite = {
+	.name = "hexdump-kunit-test",
+	.test_cases = hexdump_test_cases,
+};
 
-static void __exit test_hexdump_exit(void)
-{
-	/* do nothing */
-}
-module_exit(test_hexdump_exit);
+kunit_test_suite(hexdump_test_suite);
 
 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 MODULE_LICENSE("Dual BSD/GPL");
-- 
2.25.1

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Re: [Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[Andy Shevchenko]

On Thu, Aug 6, 2020 at 12:48 PM Arpitha Raghunandan <98.arpi@gmail.com> wrote:
>
> Converts test lib/test_hexdump.c to KUnit.
> More information about KUnit can be found at
> https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
> KUnit provides a common framework for unit tests in the kernel.

> -config TEST_HEXDUMP
> -       tristate "Test functions located in the hexdump module at runtime"

We have a nice collection of tests starting with TEST_ in the
configuration, now it's gone.
I'm strongly against this change.
Code itself okay, but without addressing above - NAK.

-- 
With Best Regards,
Andy Shevchenko
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Re: [Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[Andy Shevchenko]

On Thu, Aug 06, 2020 at 03:14:40PM +0530, Arpitha Raghunandan wrote:
> Converts test lib/test_hexdump.c to KUnit.
> More information about KUnit can be found at
> https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
> KUnit provides a common framework for unit tests in the kernel.

...

> -	if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
> -		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
> -		pr_err("Result: '%s'\n", real);
> -		pr_err("Expect: '%s'\n", test);
> -		failed_tests++;
> -	}
> +	KUNIT_EXPECT_EQ(kunittest, 0, memcmp(test, real, TEST_HEXDUMP_BUF_SIZE));


Ah, can you explain how user will see now what is being expected and what is in
reality in the buffer? I'm not gonna accept such changes without showing in
explicitly that user is not going to suffer of this change.

-- 
With Best Regards,
Andy Shevchenko


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Re: [Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[David Gow via Linux-kernel-mentees]

On Thu, Aug 6, 2020 at 5:53 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Thu, Aug 6, 2020 at 12:48 PM Arpitha Raghunandan <98.arpi@gmail.com> wrote:
> >
> > Converts test lib/test_hexdump.c to KUnit.
> > More information about KUnit can be found at
> > https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
> > KUnit provides a common framework for unit tests in the kernel.
>
> > -config TEST_HEXDUMP
> > -       tristate "Test functions located in the hexdump module at runtime"
>
> We have a nice collection of tests starting with TEST_ in the
> configuration, now it's gone.
> I'm strongly against this change.
> Code itself okay, but without addressing above - NAK.
>

This change is to make the test naming compliant with the proposed
KUnit test naming guidelines:
- https://lore.kernel.org/linux-kselftest/20200702071416.1780522-1-davidgow@google.com/

The hope is that tests built on KUnit will all end up with the same
[x]_KUNIT_TEST config options (which at least preserves the
consistency of the test naming, even if they'll not all sort
together), and should make it easier for people to know that the test
results will be in a common format, and that the test can also be run
using the KUnit tools.

The naming guidelines haven't been upstreamed yet, though, so we'd
definitely appreciate input on that thread if you've got comments more
broadly than for this particular patch. Ultimately, I don't think it
matters too much what we end up using, but having some consistency is
the goal.
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Re: [Linux-kernel-mentees] [PATCH] lib: Convert test_hexdump.c to KUnit

[Arpitha Raghunandan]

On 06/08/20 3:35 pm, Andy Shevchenko wrote:
> On Thu, Aug 06, 2020 at 03:14:40PM +0530, Arpitha Raghunandan wrote:
>> Converts test lib/test_hexdump.c to KUnit.
>> More information about KUnit can be found at
>> https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
>> KUnit provides a common framework for unit tests in the kernel.
> 
> ...
> 
>> -	if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
>> -		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
>> -		pr_err("Result: '%s'\n", real);
>> -		pr_err("Expect: '%s'\n", test);
>> -		failed_tests++;
>> -	}
>> +	KUNIT_EXPECT_EQ(kunittest, 0, memcmp(test, real, TEST_HEXDUMP_BUF_SIZE));
> 
> 
> Ah, can you explain how user will see now what is being expected and what is in
> reality in the buffer? I'm not gonna accept such changes without showing in
> explicitly that user is not going to suffer of this change.
> 
I have sent another patch replacing KUNIT_EXPECT_EQ() with KUNIT_EXPECT_EQ_MSG() and KUNIT_EXPECT_NE() with KUNIT_EXPECT_NE_MSG(). These methods log what is being expected and what is in reality in the buffer in case of test failure similar to the original test.
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