Add 24 simple KUnit tests for the lib/packing.c pack() and unpack() APIs.
The first 16 tests exercise all combinations of quirks with a simple magic
number value on a 16-byte buffer. The remaining 8 tests cover
non-multiple-of-4 buffer sizes.
These tests were originally written by Vladimir as simple selftest
functions. I adapted them to KUnit, refactoring them into a table driven
approach. This will aid in adding additional tests in the future.
Co-developed-by: Vladimir Oltean <vladimir.olt...@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.olt...@nxp.com>
Signed-off-by: Jacob Keller <jacob.e.kel...@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kits...@intel.com>
---
lib/packing_test.c | 258 +++++++++++++++++++++++++++++++++++++++++++++++++++++
MAINTAINERS | 1 +
lib/Kconfig | 12 +++
lib/Makefile | 1 +
4 files changed, 272 insertions(+)
diff --git a/lib/packing_test.c b/lib/packing_test.c
new file mode 100644
index 000000000000..4d07523dba29
--- /dev/null
+++ b/lib/packing_test.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024, Vladimir Oltean <olte...@gmail.com>
+ * Copyright (c) 2024, Intel Corporation.
+ */
+#include <kunit/test.h>
+#include <linux/packing.h>
+
+struct packing_test_case {
+ const char *desc;
+ const u8 *pbuf;
+ size_t pbuf_size;
+ u64 uval;
+ size_t start_bit;
+ size_t end_bit;
+ u8 quirks;
+};
+
+#define NO_QUIRKS 0
+
+/**
+ * PBUF - Initialize .pbuf and .pbuf_size
+ * @array: elements of constant physical buffer
+ *
+ * Initializes the .pbuf and .pbuf_size fields of a struct packing_test_case
+ * with a constant array of the specified elements.
+ */
+#define PBUF(array...) \
+ .pbuf = (const u8[]){ array }, \
+ .pbuf_size = sizeof((const u8 []){ array })
+
+static const struct packing_test_case cases[] = {
+ /* These tests pack and unpack a magic 64-bit value
+ * (0xcafedeadbeefcafe) at a fixed logical offset (32) within an
+ * otherwise zero array of 128 bits (16 bytes). They test all possible
+ * bit layouts of the 128 bit buffer.
+ */
+ {
+ .desc = "no quirks, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xca, 0xfe, 0xde, 0xad,
+ 0xbe, 0xef, 0xca, 0xfe, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "lsw32 first, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xbe, 0xef, 0xca, 0xfe,
+ 0xca, 0xfe, 0xde, 0xad, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST,
+ },
+ {
+ .desc = "little endian words, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xad, 0xde, 0xfe, 0xca,
+ 0xfe, 0xca, 0xef, 0xbe, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "msb right, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x53, 0x7f, 0x7b, 0xb5,
+ 0x7d, 0xf7, 0x53, 0x7f, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_MSB_ON_THE_RIGHT,
+ },
+ {
+ .desc = "msb right + lsw32 first, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x7d, 0xf7, 0x53, 0x7f,
+ 0x53, 0x7f, 0x7b, 0xb5, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_MSB_ON_THE_RIGHT | QUIRK_LSW32_IS_FIRST,
+ },
+ {
+ .desc = "msb right + little endian words, 16 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xb5, 0x7b, 0x7f, 0x53,
+ 0x7f, 0x53, 0xf7, 0x7d, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_MSB_ON_THE_RIGHT | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "msb right + lsw32 first + little endian words, 16
bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x7f, 0x53, 0xf7, 0x7d,
+ 0xb5, 0x7b, 0x7f, 0x53, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_MSB_ON_THE_RIGHT | QUIRK_LSW32_IS_FIRST |
QUIRK_LITTLE_ENDIAN,
+ },
+ /* These tests pack and unpack a magic 64-bit value
+ * (0xcafedeadbeefcafe) at a fixed logical offset (32) within an
+ * otherwise zero array of varying size from 18 bytes to 24 bytes.
+ */
+ {
+ .desc = "no quirks, 18 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xca, 0xfe,
+ 0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x00, 0x00,
+ 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "no quirks, 19 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xca,
+ 0xfe, 0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x00,
+ 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "no quirks, 20 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0xca, 0xfe, 0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe,
+ 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "no quirks, 22 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0xca, 0xfe, 0xde, 0xad, 0xbe, 0xef,
+ 0xca, 0xfe, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "no quirks, 24 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0xca, 0xfe, 0xde, 0xad,
+ 0xbe, 0xef, 0xca, 0xfe, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = NO_QUIRKS,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 18 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 19 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 20 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 22 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+ {
+ .desc = "lsw32 first + little endian words, 24 bytes",
+ PBUF(0x00, 0x00, 0x00, 0x00, 0xfe, 0xca, 0xef, 0xbe,
+ 0xad, 0xde, 0xfe, 0xca, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00),
+ .uval = 0xcafedeadbeefcafe,
+ .start_bit = 95,
+ .end_bit = 32,
+ .quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+ },
+};
+
+KUNIT_ARRAY_PARAM_DESC(packing, cases, desc);
+
+static void packing_test_pack(struct kunit *test)
+{
+ const struct packing_test_case *params = test->param_value;
+ u8 *pbuf;
+ int err;
+
+ pbuf = kunit_kzalloc(test, params->pbuf_size, GFP_KERNEL);
+
+ err = pack(pbuf, params->uval, params->start_bit, params->end_bit,
+ params->pbuf_size, params->quirks);
+
+ KUNIT_EXPECT_EQ_MSG(test, err, 0, "pack() returned %pe\n",
ERR_PTR(err));
+ KUNIT_EXPECT_MEMEQ(test, pbuf, params->pbuf, params->pbuf_size);
+}
+
+static void packing_test_unpack(struct kunit *test)
+{
+ const struct packing_test_case *params = test->param_value;
+ u64 uval;
+ int err;
+
+ err = unpack(params->pbuf, &uval, params->start_bit, params->end_bit,
+ params->pbuf_size, params->quirks);
+ KUNIT_EXPECT_EQ_MSG(test, err, 0, "unpack() returned %pe\n",
ERR_PTR(err));
+ KUNIT_EXPECT_EQ(test, uval, params->uval);
+}
+
+static struct kunit_case packing_test_cases[] = {
+ KUNIT_CASE_PARAM(packing_test_pack, packing_gen_params),
+ KUNIT_CASE_PARAM(packing_test_unpack, packing_gen_params),
+ {},
+};
+
+static struct kunit_suite packing_test_suite = {
+ .name = "packing",
+ .test_cases = packing_test_cases,
+};
+
+kunit_test_suite(packing_test_suite);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("KUnit tests for packing library");
diff --git a/MAINTAINERS b/MAINTAINERS
index 30a9b9450e11..8daa3b7d307a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17235,6 +17235,7 @@ S: Supported
F: Documentation/core-api/packing.rst
F: include/linux/packing.h
F: lib/packing.c
+F: lib/packing_test.c
PADATA PARALLEL EXECUTION MECHANISM
M: Steffen Klassert <steffen.klass...@secunet.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index b38849af6f13..50d85f38b569 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -40,6 +40,18 @@ config PACKING
When in doubt, say N.
+config PACKING_KUNIT_TEST
+ tristate "KUnit tests for packing library" if !KUNIT_ALL_TESTS
+ depends on PACKING && KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds KUnit tests for the packing library.
+
+ For more information on KUnit and unit tests in general,
+ please refer to the KUnit documentation in
Documentation/dev-tools/kunit/.
+
+ When in doubt, say N.
+
config BITREVERSE
tristate
diff --git a/lib/Makefile b/lib/Makefile
index 322bb127b4dc..69db48a89cf5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -153,6 +153,7 @@ obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
obj-$(CONFIG_BITREVERSE) += bitrev.o
obj-$(CONFIG_LINEAR_RANGES) += linear_ranges.o
obj-$(CONFIG_PACKING) += packing.o
+obj-$(CONFIG_PACKING_KUNIT_TEST) += packing_test.o
obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o
obj-$(CONFIG_CRC16) += crc16.o
obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o
--
2.46.0.124.g2dc1a81c8933
