selftests/bpf: Add test for BPF trampoline

Add sanity test for BPF trampoline that checks kernel functions
with up to 6 arguments of different sizes.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-10-ast@kernel.org

1 files changed, 90 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/progs/fentry_test.c b/tools/testing/selftests/bpf/progs/fentry_test.c
new file mode 100644
index 000000000000..545788bf8d50
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/fentry_test.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Facebook */
+#include <linux/bpf.h>
+#include "bpf_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct test1 {
+	ks32 a;
+};
+static volatile __u64 test1_result;
+SEC("fentry/bpf_fentry_test1")
+int test1(struct test1 *ctx)
+{
+	test1_result = ctx->a == 1;
+	return 0;
+}
+
+struct test2 {
+	ks32 a;
+	ku64 b;
+};
+static volatile __u64 test2_result;
+SEC("fentry/bpf_fentry_test2")
+int test2(struct test2 *ctx)
+{
+	test2_result = ctx->a == 2 && ctx->b == 3;
+	return 0;
+}
+
+struct test3 {
+	ks8 a;
+	ks32 b;
+	ku64 c;
+};
+static volatile __u64 test3_result;
+SEC("fentry/bpf_fentry_test3")
+int test3(struct test3 *ctx)
+{
+	test3_result = ctx->a == 4 && ctx->b == 5 && ctx->c == 6;
+	return 0;
+}
+
+struct test4 {
+	void *a;
+	ks8 b;
+	ks32 c;
+	ku64 d;
+};
+static volatile __u64 test4_result;
+SEC("fentry/bpf_fentry_test4")
+int test4(struct test4 *ctx)
+{
+	test4_result = ctx->a == (void *)7 && ctx->b == 8 && ctx->c == 9 &&
+		ctx->d == 10;
+	return 0;
+}
+
+struct test5 {
+	ku64 a;
+	void *b;
+	ks16 c;
+	ks32 d;
+	ku64 e;
+};
+static volatile __u64 test5_result;
+SEC("fentry/bpf_fentry_test5")
+int test5(struct test5 *ctx)
+{
+	test5_result = ctx->a == 11 && ctx->b == (void *)12 && ctx->c == 13 &&
+		ctx->d == 14 && ctx->e == 15;
+	return 0;
+}
+
+struct test6 {
+	ku64 a;
+	void *b;
+	ks16 c;
+	ks32 d;
+	void *e;
+	ks64 f;
+};
+static volatile __u64 test6_result;
+SEC("fentry/bpf_fentry_test6")
+int test6(struct test6 *ctx)
+{
+	test6_result = ctx->a == 16 && ctx->b == (void *)17 && ctx->c == 18 &&
+		ctx->d == 19 && ctx->e == (void *)20 && ctx->f == 21;
+	return 0;
+}