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From: Hao Luo <haoluo@google.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc: Shuah Khan <shuah@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andriin@fb.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	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>,
	Quentin Monnet <quentin@isovalent.com>,
	Hao Luo <haoluo@google.com>, Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>, Andrey Ignatov <rdna@fb.com>,
	Jakub Sitnicki <jakub@cloudflare.com>
Subject: [PATCH bpf-next v1 8/8] bpf/selftests: Test for bpf_per_cpu_ptr()
Date: Wed, 19 Aug 2020 15:40:30 -0700	[thread overview]
Message-ID: <20200819224030.1615203-9-haoluo@google.com> (raw)
In-Reply-To: <20200819224030.1615203-1-haoluo@google.com>

Test bpf_per_cpu_ptr(). Test two paths in the kernel. If the base
pointer points to a struct, the returned reg is of type PTR_TO_BTF_ID.
Direct pointer dereference can be applied on the returned variable.
If the base pointer isn't a struct, the returned reg is of type
PTR_TO_MEM, which also supports direct pointer dereference.

Signed-off-by: Hao Luo <haoluo@google.com>
---
 .../testing/selftests/bpf/prog_tests/ksyms_btf.c  |  4 ++++
 .../testing/selftests/bpf/progs/test_ksyms_btf.c  | 15 ++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/ksyms_btf.c b/tools/testing/selftests/bpf/prog_tests/ksyms_btf.c
index 1dad61ba7e99..bdedd4a76b42 100644
--- a/tools/testing/selftests/bpf/prog_tests/ksyms_btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/ksyms_btf.c
@@ -71,6 +71,10 @@ void test_ksyms_btf(void)
 	      "got %llu, exp %llu\n", data->out__runqueues, runqueues_addr);
 	CHECK(data->out__bpf_prog_active != bpf_prog_active_addr, "bpf_prog_active",
 	      "got %llu, exp %llu\n", data->out__bpf_prog_active, bpf_prog_active_addr);
+	CHECK(data->out__rq_cpu != 1, "rq_cpu",
+	      "got %u, exp %u\n", data->out__rq_cpu, 1);
+	CHECK(data->out__process_counts == -1, "process_counts",
+	      "got %lu, exp != -1", data->out__process_counts);
 
 cleanup:
 	test_ksyms_btf__destroy(skel);
diff --git a/tools/testing/selftests/bpf/progs/test_ksyms_btf.c b/tools/testing/selftests/bpf/progs/test_ksyms_btf.c
index e04e31117f84..78cf1ebb753d 100644
--- a/tools/testing/selftests/bpf/progs/test_ksyms_btf.c
+++ b/tools/testing/selftests/bpf/progs/test_ksyms_btf.c
@@ -7,16 +7,29 @@
 
 __u64 out__runqueues = -1;
 __u64 out__bpf_prog_active = -1;
+__u32 out__rq_cpu = -1;
+unsigned long out__process_counts = -1;
 
-extern const struct rq runqueues __ksym; /* struct type global var. */
+extern const struct rq runqueues __ksym; /* struct type percpu var. */
 extern const int bpf_prog_active __ksym; /* int type global var. */
+extern const unsigned long process_counts __ksym; /* int type percpu var. */
 
 SEC("raw_tp/sys_enter")
 int handler(const void *ctx)
 {
+	struct rq *rq;
+	unsigned long *count;
+
 	out__runqueues = (__u64)&runqueues;
 	out__bpf_prog_active = (__u64)&bpf_prog_active;
 
+	rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 1);
+	if (rq)
+		out__rq_cpu = rq->cpu;
+	count = (unsigned long *)bpf_per_cpu_ptr(&process_counts, 1);
+	if (count)
+		out__process_counts = *count;
+
 	return 0;
 }
 
-- 
2.28.0.220.ged08abb693-goog


  parent reply	other threads:[~2020-08-19 22:41 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-19 22:40 [PATCH bpf-next v1 0/8] bpf: BTF support for ksyms Hao Luo
2020-08-19 22:40 ` [PATCH bpf-next v1 1/8] bpf: Introduce pseudo_btf_id Hao Luo
2020-08-20 15:22   ` Yonghong Song
2020-08-20 17:04     ` Hao Luo
2020-08-25  0:05     ` Hao Luo
2020-08-25  0:43       ` Yonghong Song
2020-08-20 16:43   ` Yonghong Song
2020-08-20 21:53   ` Alexei Starovoitov
2020-08-21  2:22     ` Hao Luo
2020-08-19 22:40 ` [PATCH bpf-next v1 2/8] bpf: Propagate BPF_PSEUDO_BTF_ID to uapi headers in /tools Hao Luo
2020-08-20 16:44   ` Yonghong Song
2020-08-19 22:40 ` [PATCH bpf-next v1 3/8] bpf: Introduce help function to validate ksym's type Hao Luo
2020-08-20 17:20   ` Yonghong Song
2020-08-21 21:50     ` Andrii Nakryiko
2020-08-22  0:43       ` Hao Luo
2020-08-22  2:43         ` Andrii Nakryiko
2020-08-22  7:04           ` Hao Luo
2020-08-19 22:40 ` [PATCH bpf-next v1 4/8] bpf/libbpf: BTF support for typed ksyms Hao Luo
2020-08-21 22:37   ` Andrii Nakryiko
2020-08-27 22:29     ` Hao Luo
2020-09-01 18:11       ` Andrii Nakryiko
2020-09-01 20:35         ` Hao Luo
2020-09-01 23:54           ` Andrii Nakryiko
2020-09-02  0:46             ` Hao Luo
2020-08-19 22:40 ` [PATCH bpf-next v1 5/8] bpf/selftests: ksyms_btf to test " Hao Luo
2020-08-20 17:28   ` Yonghong Song
2020-08-21 23:03     ` Andrii Nakryiko
2020-08-22  7:26       ` Hao Luo
2020-08-22  7:35         ` Andrii Nakryiko
2020-08-19 22:40 ` [PATCH bpf-next v1 6/8] bpf: Introduce bpf_per_cpu_ptr() Hao Luo
2020-08-22  3:26   ` Andrii Nakryiko
2020-08-22  3:31     ` Andrii Nakryiko
2020-08-22  7:49       ` Hao Luo
2020-08-22  7:55         ` Andrii Nakryiko
2020-08-25  1:03           ` Hao Luo
2020-08-19 22:40 ` [PATCH bpf-next v1 7/8] bpf: Propagate bpf_per_cpu_ptr() to /tools Hao Luo
2020-08-20 17:30   ` Yonghong Song
2020-08-19 22:40 ` Hao Luo [this message]
2020-08-22  3:30   ` [PATCH bpf-next v1 8/8] bpf/selftests: Test for bpf_per_cpu_ptr() Andrii Nakryiko
2020-08-28  3:42     ` Hao Luo
2020-09-01 18:12       ` Andrii Nakryiko
2020-09-01 19:47         ` Hao Luo

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