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Subject[PATCH bpf-next 3/5] selftests/bpf: add selftest for BPF_PROG_TYPE_USER
Date
This test checks the correctness of BPF_PROG_TYPE_USER program, including:
running on the right cpu, passing in correct args, returning retval, and
being able to call bpf_get_stack|stackid.

Signed-off-by: Song Liu <songliubraving@fb.com>
---
.../selftests/bpf/prog_tests/user_prog.c | 52 +++++++++++++++++
tools/testing/selftests/bpf/progs/user_prog.c | 56 +++++++++++++++++++
2 files changed, 108 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/user_prog.c
create mode 100644 tools/testing/selftests/bpf/progs/user_prog.c

diff --git a/tools/testing/selftests/bpf/prog_tests/user_prog.c b/tools/testing/selftests/bpf/prog_tests/user_prog.c
new file mode 100644
index 0000000000000..416707b3bff01
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/user_prog.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include <test_progs.h>
+#include "user_prog.skel.h"
+
+static int duration;
+
+void test_user_prog(void)
+{
+ struct bpf_user_prog_args args = {{0, 1, 2, 3, 4}};
+ struct bpf_prog_test_run_attr attr = {};
+ struct user_prog *skel;
+ int i, numcpu, ret;
+
+ skel = user_prog__open_and_load();
+
+ if (CHECK(!skel, "user_prog__open_and_load",
+ "skeleton open_and_laod failed\n"))
+ return;
+
+ numcpu = libbpf_num_possible_cpus();
+
+ attr.prog_fd = bpf_program__fd(skel->progs.user_func);
+ attr.data_size_in = sizeof(args);
+ attr.data_in = &args;
+
+ /* start from -1, so we test cpu_plus == 0 */
+ for (i = -1; i < numcpu; i++) {
+ args.args[0] = i + 1;
+ attr.cpu_plus = i + 1;
+ ret = bpf_prog_test_run_xattr(&attr);
+ CHECK(ret, "bpf_prog_test_run_xattr", "returns error\n");
+
+ /* skip two tests for i == -1 */
+ if (i == -1)
+ continue;
+ CHECK(attr.retval != i + 2, "bpf_prog_test_run_xattr",
+ "doesn't get expected retval\n");
+ CHECK(skel->data->sum != 11 + i, "user_prog_args_test",
+ "sum of args doesn't match\n");
+ }
+
+ CHECK(skel->data->cpu_match == 0, "cpu_match_test", "failed\n");
+ CHECK(skel->bss->get_stack_success != numcpu + 1, "test_bpf_get_stack",
+ "failed on %d cores\n", numcpu - skel->bss->get_stack_success);
+ CHECK(skel->bss->get_stackid_success != numcpu + 1,
+ "test_bpf_get_stackid",
+ "failed on %d cores\n",
+ numcpu + 1 - skel->bss->get_stackid_success);
+
+ user_prog__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/user_prog.c b/tools/testing/selftests/bpf/progs/user_prog.c
new file mode 100644
index 0000000000000..cf320e97f107a
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/user_prog.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+#ifndef PERF_MAX_STACK_DEPTH
+#define PERF_MAX_STACK_DEPTH 127
+#endif
+
+typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH];
+
+struct {
+ __uint(type, BPF_MAP_TYPE_STACK_TRACE);
+ __uint(max_entries, 16384);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(stack_trace_t));
+} stackmap SEC(".maps");
+
+volatile int cpu_match = 1;
+volatile __u64 sum = 1;
+volatile int get_stack_success = 0;
+volatile int get_stackid_success = 0;
+volatile __u64 stacktrace[PERF_MAX_STACK_DEPTH];
+
+SEC("user")
+int user_func(struct bpf_user_prog_ctx *ctx)
+{
+ int cpu = bpf_get_smp_processor_id();
+ __u32 key = cpu;
+ long stackid, err;
+
+ /* check the program runs on the right cpu */
+ if (ctx->args[0] && ctx->args[0] != cpu + 1)
+ cpu_match = 0;
+
+ /* check the sum of arguments are correct */
+ sum = ctx->args[0] + ctx->args[1] + ctx->args[2] +
+ ctx->args[3] + ctx->args[4];
+
+ /* check bpf_get_stackid works */
+ stackid = bpf_get_stackid(ctx, &stackmap, 0);
+ if (stackid >= 0)
+ get_stackid_success++;
+
+ /* check bpf_get_stack works */
+ err = bpf_get_stack(ctx, (void *)stacktrace,
+ PERF_MAX_STACK_DEPTH * sizeof(__u64),
+ BPF_F_USER_STACK);
+ if (err >= 0)
+ get_stack_success++;
+
+ return cpu + 2;
+}
--
2.24.1
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