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[iwl-next,v2,07/13] lib: packing: add additional KUnit tests

Message ID 20240828-e810-live-migration-jk-prep-ctx-functions-v2-7-558ab9e240f5@intel.com (mailing list archive)
State Awaiting Upstream
Headers show
Series ice: use <linux/packing.h> for Tx and Rx queue context data | expand

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netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 16 this patch: 16
netdev/build_tools success No tools touched, skip
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netdev/build_clang success Errors and warnings before: 16 this patch: 16
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 16 this patch: 16
netdev/checkpatch warning WARNING: line length of 83 exceeds 80 columns WARNING: line length of 89 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jacob Keller Aug. 28, 2024, 8:57 p.m. UTC 
While reviewing the initial KUnit tests for lib/packing, Przemek pointed
out that the test values have duplicate bytes in the input sequence.

In addition, I noticed that the unit tests pack and unpack on a byte
boundary, instead of crossing bytes. Thus, we lack good coverage of the
corner cases of the API.

Add additional unit tests to cover packing and unpacking byte buffers which
do not have duplicate bytes in the unpacked value, and which pack and
unpack to an unaligned offset.

A careful reviewer may note the lack tests for QUIRK_MSB_ON_THE_RIGHT. This
is because I found issues with that quirk during test implementation. This
quirk will be fixed and the tests will be included in a future change.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
 lib/packing_test.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
diff mbox series

Patch

diff --git a/lib/packing_test.c b/lib/packing_test.c
index 4d07523dba29..5d533e633e06 100644
--- a/lib/packing_test.c
+++ b/lib/packing_test.c
@@ -210,6 +210,88 @@  static const struct packing_test_case cases[] = {
 		.end_bit = 32,
 		.quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
 	},
+	/* These tests pack and unpack a magic 64-bit value
+	 * (0x1122334455667788) at an odd starting bit (43) 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, non-aligned",
+		PBUF(0x00, 0x00, 0x00, 0x89, 0x11, 0x9a, 0x22, 0xab,
+		     0x33, 0xbc, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00),
+		.uval = 0x1122334455667788,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = NO_QUIRKS,
+	},
+	{
+		.desc = "lsw32 first, 16 bytes, non-aligned",
+		PBUF(0x00, 0x00, 0x00, 0x00, 0x33, 0xbc, 0x40, 0x00,
+		     0x11, 0x9a, 0x22, 0xab, 0x00, 0x00, 0x00, 0x89),
+		.uval = 0x1122334455667788,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LSW32_IS_FIRST,
+	},
+	{
+		.desc = "little endian words, 16 bytes, non-aligned",
+		PBUF(0x89, 0x00, 0x00, 0x00, 0xab, 0x22, 0x9a, 0x11,
+		     0x00, 0x40, 0xbc, 0x33, 0x00, 0x00, 0x00, 0x00),
+		.uval = 0x1122334455667788,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LITTLE_ENDIAN,
+	},
+	{
+		.desc = "lsw32 first + little endian words, 16 bytes, non-aligned",
+		PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0xbc, 0x33,
+		     0xab, 0x22, 0x9a, 0x11, 0x89, 0x00, 0x00, 0x00),
+		.uval = 0x1122334455667788,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+	},
+	/* These tests pack and unpack a u64 with all bits set
+	 * (0xffffffffffffffff) at an odd starting bit (43) 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, non-aligned, 0xff",
+		PBUF(0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
+		     0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00),
+		.uval = 0xffffffffffffffff,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = NO_QUIRKS,
+	},
+	{
+		.desc = "lsw32 first, 16 bytes, non-aligned, 0xff",
+		PBUF(0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xf8, 0x00,
+		     0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x07, 0xff),
+		.uval = 0xffffffffffffffff,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LSW32_IS_FIRST,
+	},
+	{
+		.desc = "little endian words, 16 bytes, non-aligned, 0xff",
+		PBUF(0xff, 0x07, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+		     0x00, 0xf8, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00),
+		.uval = 0xffffffffffffffff,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LITTLE_ENDIAN,
+	},
+	{
+		.desc = "lsw32 first + little endian words, 16 bytes, non-aligned, 0xff",
+		PBUF(0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xff, 0xff,
+		     0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x00, 0x00),
+		.uval = 0xffffffffffffffff,
+		.start_bit = 106,
+		.end_bit = 43,
+		.quirks = QUIRK_LSW32_IS_FIRST | QUIRK_LITTLE_ENDIAN,
+	},
 };
 
 KUNIT_ARRAY_PARAM_DESC(packing, cases, desc);