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From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
	"Martin KaFai Lau" <kafai@fb.com>,
	"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"KP Singh" <kpsingh@chromium.org>,
	"Toke Høiland-Jørgensen" <toke@redhat.com>
Subject: [RFC PATCH bpf-next 2/4] selftests/bpf: Add re-attach test to fentry_test
Date: Sun, 28 Mar 2021 13:26:27 +0200	[thread overview]
Message-ID: <20210328112629.339266-3-jolsa@kernel.org> (raw)
In-Reply-To: <20210328112629.339266-1-jolsa@kernel.org>

Adding the test to re-attach (detach/attach again) tracing
fentry programs, plus check that already linked program can't
be attached again.

Fixing the number of check-ed results, which should be 8.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 .../selftests/bpf/prog_tests/fentry_test.c    | 58 ++++++++++++++-----
 1 file changed, 45 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_test.c b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
index 04ebbf1cb390..fa7a9c719659 100644
--- a/tools/testing/selftests/bpf/prog_tests/fentry_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
@@ -3,20 +3,13 @@
 #include <test_progs.h>
 #include "fentry_test.skel.h"
 
-void test_fentry_test(void)
+static __u32 duration;
+
+static int fentry_test(struct fentry_test *fentry_skel)
 {
-	struct fentry_test *fentry_skel = NULL;
 	int err, prog_fd, i;
-	__u32 duration = 0, retval;
 	__u64 *result;
-
-	fentry_skel = fentry_test__open_and_load();
-	if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))
-		goto cleanup;
-
-	err = fentry_test__attach(fentry_skel);
-	if (CHECK(err, "fentry_attach", "fentry attach failed: %d\n", err))
-		goto cleanup;
+	__u32 retval;
 
 	prog_fd = bpf_program__fd(fentry_skel->progs.test1);
 	err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
@@ -26,12 +19,51 @@ void test_fentry_test(void)
 	      err, errno, retval, duration);
 
 	result = (__u64 *)fentry_skel->bss;
-	for (i = 0; i < 6; i++) {
+	for (i = 0; i < 8; i++) {
 		if (CHECK(result[i] != 1, "result",
 			  "fentry_test%d failed err %lld\n", i + 1, result[i]))
-			goto cleanup;
+			return -1;
 	}
 
+	/* zero results for re-attach test */
+	for (i = 0; i < 8; i++)
+		result[i] = 0;
+	return 0;
+}
+
+void test_fentry_test(void)
+{
+	struct fentry_test *fentry_skel = NULL;
+	struct bpf_link *link;
+	int err;
+
+	fentry_skel = fentry_test__open_and_load();
+	if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))
+		goto cleanup;
+
+	err = fentry_test__attach(fentry_skel);
+	if (CHECK(err, "fentry_attach", "fentry attach failed: %d\n", err))
+		goto cleanup;
+
+	err = fentry_test(fentry_skel);
+	if (CHECK(err, "fentry_test", "fentry test failed: %d\n", err))
+		goto cleanup;
+
+	fentry_test__detach(fentry_skel);
+
+	/* Re-attach and test again */
+	err = fentry_test__attach(fentry_skel);
+	if (CHECK(err, "fentry_attach", "fentry re-attach failed: %d\n", err))
+		goto cleanup;
+
+	link = bpf_program__attach(fentry_skel->progs.test1);
+	if (CHECK(!IS_ERR(link), "attach_fentry re-attach without detach",
+		  "err: %ld\n", PTR_ERR(link)))
+		goto cleanup;
+
+	err = fentry_test(fentry_skel);
+	CHECK(err, "fentry_test", "fentry test failed: %d\n", err);
+
 cleanup:
 	fentry_test__destroy(fentry_skel);
 }
-- 
2.30.2


  parent reply	other threads:[~2021-03-28 11:27 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-28 11:26 [RFC PATCH bpf-next 0/4] bpf: Tracing programs re-attach Jiri Olsa
2021-03-28 11:26 ` [RFC PATCH bpf-next 1/4] bpf: Allow trampoline re-attach Jiri Olsa
2021-03-30  1:18   ` Song Liu
2021-04-03 11:24   ` Toke Høiland-Jørgensen
2021-04-03 18:21     ` Alexei Starovoitov
2021-04-05 14:08       ` Jiri Olsa
2021-04-05 14:15         ` Toke Høiland-Jørgensen
2021-04-05 21:58           ` Jiri Olsa
2021-04-05 14:06     ` Jiri Olsa
2021-03-28 11:26 ` Jiri Olsa [this message]
2021-03-30  1:23   ` [RFC PATCH bpf-next 2/4] selftests/bpf: Add re-attach test to fentry_test Song Liu
2021-03-30 20:02     ` Jiri Olsa
2021-03-28 11:26 ` [RFC PATCH bpf-next 3/4] selftests/bpf: Add re-attach test to fexit_test Jiri Olsa
2021-03-28 11:26 ` [RFC PATCH bpf-next 4/4] selftests/bpf: Test that module can't be unloaded with attached trampoline Jiri Olsa
2021-03-30  6:12   ` Song Liu

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