diff mbox series

[bpf-next,v2,01/13] selftests/bpf: add a macro to compare raw memory

Message ID 20241114-flow_dissector-v2-1-ee4a3be3de65@bootlin.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series selftests/bpf: migrate test_flow_dissector.sh to test_progs | 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: 3 this patch: 3
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netdev/cc_maintainers success CCed 16 of 16 maintainers
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netdev/verify_signedoff success Signed-off-by tag matches author and committer
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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: 3 this patch: 3
netdev/checkpatch fail ERROR: do not initialise statics to 0
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Commit Message

Alexis Lothoré (eBPF Foundation) Nov. 14, 2024, 9:50 p.m. UTC 
We sometimes need to compare whole structures in an assert. It is
possible to use the existing macros on each field, but when the whole
structure has to be checked, it is more convenient to simply compare the
whole structure memory

Add a dedicated assert macro, ASSERT_MEMEQ, to allow bare memory
comparision
The output generated by this new macro looks like the following:
[...]
run_tests_skb_less:FAIL:returned flow keys unexpected memory mismatch
actual:
	00 00 00 00 00 00 00 00 	00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 	00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 	00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00
expected:
	0E 00 3E 00 DD 86 01 01 	00 06 86 DD 50 00 90 1F
	00 00 00 00 00 00 00 00 	00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 	00 00 00 00 00 00 00 00
	01 00 00 00 00 00 00 00
[...]

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v2:
- replace DUMP_BUFFER with a real function
- make this function take a prefix
- add formatting example in the commit message
---
 tools/testing/selftests/bpf/test_progs.c | 15 +++++++++++++++
 tools/testing/selftests/bpf/test_progs.h | 15 +++++++++++++++
 2 files changed, 30 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 6088d8222d5905c3df6e6ebfb095c6bc5bf22399..c9e745d49493e594b55d79ac26061b0466f9a039 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -1282,6 +1282,21 @@  void crash_handler(int signum)
 	backtrace_symbols_fd(bt, sz, STDERR_FILENO);
 }
 
+void hexdump(const char *prefix, const void *buf, size_t len)
+{
+	for (int i = 0; i < len; i++) {
+		if (!(i % 16)) {
+			if (i)
+				fprintf(stdout, "\n");
+			fprintf(stdout, "%s", prefix);
+		}
+		if (i && !(i % 8) && (i % 16))
+			fprintf(stdout, "\t");
+		fprintf(stdout, "%02X ", ((uint8_t *)(buf))[i]);
+	}
+	fprintf(stdout, "\n");
+}
+
 static void sigint_handler(int signum)
 {
 	int i;
diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
index 74de33ae37e56c90646cd1e0bb58ed7e3f345ec0..404d0d4915d54fe15f6c33dbabdb58cccc3b2781 100644
--- a/tools/testing/selftests/bpf/test_progs.h
+++ b/tools/testing/selftests/bpf/test_progs.h
@@ -185,6 +185,7 @@  void test__end_subtest(void);
 void test__skip(void);
 void test__fail(void);
 int test__join_cgroup(const char *path);
+void hexdump(const char *prefix, const void *buf, size_t len);
 
 #define PRINT_FAIL(format...)                                                  \
 	({                                                                     \
@@ -344,6 +345,20 @@  int test__join_cgroup(const char *path);
 	___ok;								\
 })
 
+#define ASSERT_MEMEQ(actual, expected, len, name) ({			\
+	static int duration = 0;					\
+	const void *__act = actual;					\
+	const void *__exp = expected;					\
+	int __len = len;						\
+	bool ___ok = memcmp(__act, __exp, __len) == 0;			\
+	CHECK(!___ok, (name), "unexpected memory mismatch\n");		\
+	fprintf(stdout, "actual:\n");					\
+	hexdump("\t", __act, __len);					\
+	fprintf(stdout, "expected:\n");					\
+	hexdump("\t", __exp, __len);					\
+	___ok;								\
+})
+
 #define ASSERT_OK(res, name) ({						\
 	static int duration = 0;					\
 	long long ___res = (res);					\