linux-kernel - [PATCH bpf-next 2/2] selftests: bpf: Add a new test for bare tracepoints

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Date:   Mon, 11 Jan 2021 18:20:27 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Qais Yousef <qais.yousef@....com>
Subject: [PATCH bpf-next 2/2] selftests: bpf: Add a new test for bare tracepoints

Reuse module_attach infrastructure to add a new bare tracepoint to check
we can attach to it as a raw tracepoint.

Signed-off-by: Qais Yousef <qais.yousef@....com>
---

Andrii

I was getting the error below when I was trying to run the test.
I had to comment out all related fentry* code to be able to test the raw_tp
stuff. Not sure something I've done wrong or it's broken for some reason.
I was on v5.11-rc2.

	$ sudo ./test_progs -v -t module_attach
	bpf_testmod.ko is already unloaded.
	Loading bpf_testmod.ko...
	Successfully loaded bpf_testmod.ko.
	test_module_attach:PASS:skel_open 0 nsec
	test_module_attach:PASS:set_attach_target 0 nsec
	test_module_attach:PASS:skel_load 0 nsec
	libbpf: prog 'handle_fentry': failed to attach: ERROR: strerror_r(-524)=22
	libbpf: failed to auto-attach program 'handle_fentry': -524
	test_module_attach:FAIL:skel_attach skeleton attach failed: -524
	#58 module_attach:FAIL
	Successfully unloaded bpf_testmod.ko.
	Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED


 .../selftests/bpf/bpf_testmod/bpf_testmod-events.h     |  6 ++++++
 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c  |  2 ++
 tools/testing/selftests/bpf/prog_tests/module_attach.c |  1 +
 tools/testing/selftests/bpf/progs/test_module_attach.c | 10 ++++++++++
 4 files changed, 19 insertions(+)

diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
index b83ea448bc79..e1ada753f10c 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
@@ -28,6 +28,12 @@ TRACE_EVENT(bpf_testmod_test_read,
 		  __entry->pid, __entry->comm, __entry->off, __entry->len)
 );
 
+/* A bare tracepoint with no event associated with it */
+DECLARE_TRACE(bpf_testmod_test_read_bare,
+	TP_PROTO(struct task_struct *task, struct bpf_testmod_test_read_ctx *ctx),
+	TP_ARGS(task, ctx)
+);
+
 #endif /* _BPF_TESTMOD_EVENTS_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index 2df19d73ca49..d63cebdaca44 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -22,6 +22,8 @@ bpf_testmod_test_read(struct file *file, struct kobject *kobj,
 	};
 
 	trace_bpf_testmod_test_read(current, &ctx);
+	ctx.len++;
+	trace_bpf_testmod_test_read_bare(current, &ctx);
 
 	return -EIO; /* always fail */
 }
diff --git a/tools/testing/selftests/bpf/prog_tests/module_attach.c b/tools/testing/selftests/bpf/prog_tests/module_attach.c
index 50796b651f72..7085a118f38c 100644
--- a/tools/testing/selftests/bpf/prog_tests/module_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c
@@ -50,6 +50,7 @@ void test_module_attach(void)
 	ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
 
 	ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
+	ASSERT_EQ(bss->raw_tp_bare_read_sz, READ_SZ+1, "raw_tp_bare");
 	ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
 	ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
 	ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
diff --git a/tools/testing/selftests/bpf/progs/test_module_attach.c b/tools/testing/selftests/bpf/progs/test_module_attach.c
index efd1e287ac17..08aa157afa1d 100644
--- a/tools/testing/selftests/bpf/progs/test_module_attach.c
+++ b/tools/testing/selftests/bpf/progs/test_module_attach.c
@@ -17,6 +17,16 @@ int BPF_PROG(handle_raw_tp,
 	return 0;
 }
 
+__u32 raw_tp_bare_read_sz = 0;
+
+SEC("raw_tp/bpf_testmod_test_read_bare")
+int BPF_PROG(handle_raw_tp_bare,
+	     struct task_struct *task, struct bpf_testmod_test_read_ctx *read_ctx)
+{
+	raw_tp_bare_read_sz = BPF_CORE_READ(read_ctx, len);
+	return 0;
+}
+
 __u32 tp_btf_read_sz = 0;
 
 SEC("tp_btf/bpf_testmod_test_read")
-- 
2.25.1