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[v2,bpf-next,2/3] selftests/bpf: add __int128-specific tests for typed data dump

Message ID 1626770993-11073-3-git-send-email-alan.maguire@oracle.com
State New
Headers show
Series [v2,bpf-next,1/3] libbpf: avoid use of __int128 in typed dump display | expand

Commit Message

Alan Maguire July 20, 2021, 8:49 a.m. UTC 
Add tests for __int128 display for platforms that support it.
__int128s are dumped as hex values.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 tools/testing/selftests/bpf/prog_tests/btf_dump.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dump.c b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
index 0b4ba53..52ccf0c 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf_dump.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
@@ -327,6 +327,14 @@  static int btf_dump_data(struct btf *btf, struct btf_dump *d,
 static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
 				   char *str)
 {
+#ifdef __SIZEOF_INT128__
+	__int128 i = 0xffffffffffffffff;
+
+	/* this dance is required because we cannot directly initialize
+	 * a 128-bit value to anything larger than a 64-bit value.
+	 */
+	i = (i << 64) | (i - 1);
+#endif
 	/* simple int */
 	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, 1234);
 	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
@@ -348,6 +356,15 @@  static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
 	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)-4567", -4567);
 
 	TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, int, sizeof(int)-1, "", 1);
+
+#ifdef __SIZEOF_INT128__
+	TEST_BTF_DUMP_DATA(btf, d, NULL, str, __int128, BTF_F_COMPACT,
+			   "(__int128)0xffffffffffffffff",
+			   0xffffffffffffffff);
+	ASSERT_OK(btf_dump_data(btf, d, "__int128", NULL, 0, &i, 16, str,
+				"(__int128)0xfffffffffffffffffffffffffffffffe"),
+		  "dump __int128");
+#endif
 }
 
 static void test_btf_dump_float_data(struct btf *btf, struct btf_dump *d,