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Date: Fri, 13 May 2022 14:39:52 +0800
From: Feng zhou <zhoufeng.zf@...edance.com>
To: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
kafai@...com, songliubraving@...com, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org, rostedt@...dmis.org,
mingo@...hat.com, jolsa@...nel.org, davemarchevsky@...com,
joannekoong@...com, geliang.tang@...e.com
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
linux-kernel@...r.kernel.org, duanxiongchun@...edance.com,
songmuchun@...edance.com, wangdongdong.6@...edance.com,
cong.wang@...edance.com, zhouchengming@...edance.com,
zhoufeng.zf@...edance.com, yosryahmed@...gle.com
Subject: [PATCH bpf-next v3 2/2] selftests/bpf: add test case for bpf_map_lookup_percpu_elem
From: Feng Zhou <zhoufeng.zf@...edance.com>
test_progs:
Tests new ebpf helpers bpf_map_lookup_percpu_elem.
Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
---
.../bpf/prog_tests/map_lookup_percpu_elem.c | 59 +++++++++++++++
.../bpf/progs/test_map_lookup_percpu_elem.c | 71 +++++++++++++++++++
2 files changed, 130 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
create mode 100644 tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
diff --git a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
new file mode 100644
index 000000000000..89ca170f1c25
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2022 Bytedance */
+
+#include <test_progs.h>
+
+#include "test_map_lookup_percpu_elem.skel.h"
+
+void test_map_lookup_percpu_elem(void)
+{
+ struct test_map_lookup_percpu_elem *skel;
+ __u64 key = 0, sum;
+ int ret, i;
+ int nr_cpus = libbpf_num_possible_cpus();
+ __u64 *buf;
+
+ buf = (__u64 *)malloc(nr_cpus*sizeof(__u64));
+ if (!ASSERT_OK_PTR(buf, "malloc"))
+ return;
+
+ for (i=0; i<nr_cpus; i++)
+ buf[i] = i;
+ sum = (nr_cpus-1)*nr_cpus/2;
+
+ skel = test_map_lookup_percpu_elem__open();
+ if (!ASSERT_OK_PTR(skel, "test_map_lookup_percpu_elem__open"))
+ goto exit;
+
+ skel->rodata->nr_cpus = nr_cpus;
+
+ ret = test_map_lookup_percpu_elem__load(skel);
+ if (!ASSERT_OK(ret, "test_map_lookup_percpu_elem__load"))
+ goto cleanup;
+
+ ret = test_map_lookup_percpu_elem__attach(skel);
+ if (!ASSERT_OK(ret, "test_map_lookup_percpu_elem__attach"))
+ goto cleanup;
+
+ ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_array_map), &key, buf, 0);
+ ASSERT_OK(ret, "percpu_array_map update");
+
+ ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_hash_map), &key, buf, 0);
+ ASSERT_OK(ret, "percpu_hash_map update");
+
+ ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_lru_hash_map), &key, buf, 0);
+ ASSERT_OK(ret, "percpu_lru_hash_map update");
+
+ syscall(__NR_getuid);
+
+ test_map_lookup_percpu_elem__detach(skel);
+
+ ASSERT_EQ(skel->bss->percpu_array_elem_sum, sum, "percpu_array lookup percpu elem");
+ ASSERT_EQ(skel->bss->percpu_hash_elem_sum, sum, "percpu_hash lookup percpu elem");
+ ASSERT_EQ(skel->bss->percpu_lru_hash_elem_sum, sum, "percpu_lru_hash lookup percpu elem");
+
+cleanup:
+ test_map_lookup_percpu_elem__destroy(skel);
+exit:
+ free(buf);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
new file mode 100644
index 000000000000..75479180571f
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2022 Bytedance */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+
+__u64 percpu_array_elem_sum = 0;
+__u64 percpu_hash_elem_sum = 0;
+__u64 percpu_lru_hash_elem_sum = 0;
+const volatile int nr_cpus;
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u64);
+} percpu_array_map SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
+ __uint(max_entries, 1);
+ __type(key, __u64);
+ __type(value, __u64);
+} percpu_hash_map SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH);
+ __uint(max_entries, 1);
+ __type(key, __u64);
+ __type(value, __u64);
+} percpu_lru_hash_map SEC(".maps");
+
+struct read_percpu_elem_ctx {
+ void *map;
+ __u64 sum;
+};
+
+static int read_percpu_elem_callback(__u32 index, struct read_percpu_elem_ctx *ctx)
+{
+ __u64 key = 0;
+ __u64 *value;
+ value = bpf_map_lookup_percpu_elem(ctx->map, &key, index);
+ if (value)
+ ctx->sum += *value;
+ return 0;
+}
+
+SEC("tp/syscalls/sys_enter_getuid")
+int sysenter_getuid(const void *ctx)
+{
+ struct read_percpu_elem_ctx map_ctx;
+
+ map_ctx.map = &percpu_array_map;
+ map_ctx.sum = 0;
+ bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+ percpu_array_elem_sum = map_ctx.sum;
+
+ map_ctx.map = &percpu_hash_map;
+ map_ctx.sum = 0;
+ bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+ percpu_hash_elem_sum = map_ctx.sum;
+
+ map_ctx.map = &percpu_lru_hash_map;
+ map_ctx.sum = 0;
+ bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+ percpu_lru_hash_elem_sum = map_ctx.sum;
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.20.1
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