1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019 Facebook */
3#include <test_progs.h>
4
5void serial_test_fexit_stress(void)
6{
7	int bpf_max_tramp_links, err, i;
8	int *fd, *fexit_fd, *link_fd;
9
10	bpf_max_tramp_links = get_bpf_max_tramp_links();
11	if (!ASSERT_GE(bpf_max_tramp_links, 1, "bpf_max_tramp_links"))
12		return;
13	fd = calloc(bpf_max_tramp_links * 2, sizeof(*fd));
14	if (!ASSERT_OK_PTR(fd, "fd"))
15		return;
16	fexit_fd = fd;
17	link_fd = fd + bpf_max_tramp_links;
18
19	const struct bpf_insn trace_program[] = {
20		BPF_MOV64_IMM(BPF_REG_0, 0),
21		BPF_EXIT_INSN(),
22	};
23
24	LIBBPF_OPTS(bpf_prog_load_opts, trace_opts,
25		.expected_attach_type = BPF_TRACE_FEXIT,
26	);
27
28	LIBBPF_OPTS(bpf_test_run_opts, topts);
29
30	err = libbpf_find_vmlinux_btf_id("bpf_fentry_test1",
31					 trace_opts.expected_attach_type);
32	if (!ASSERT_GT(err, 0, "find_vmlinux_btf_id"))
33		goto out;
34	trace_opts.attach_btf_id = err;
35
36	for (i = 0; i < bpf_max_tramp_links; i++) {
37		fexit_fd[i] = bpf_prog_load(BPF_PROG_TYPE_TRACING, NULL, "GPL",
38					    trace_program,
39					    sizeof(trace_program) / sizeof(struct bpf_insn),
40					    &trace_opts);
41		if (!ASSERT_GE(fexit_fd[i], 0, "fexit load"))
42			goto out;
43		link_fd[i] = bpf_link_create(fexit_fd[i], 0, BPF_TRACE_FEXIT, NULL);
44		if (!ASSERT_GE(link_fd[i], 0, "fexit attach"))
45			goto out;
46	}
47
48	err = bpf_prog_test_run_opts(fexit_fd[0], &topts);
49	ASSERT_OK(err, "bpf_prog_test_run_opts");
50
51out:
52	for (i = 0; i < bpf_max_tramp_links; i++) {
53		if (link_fd[i])
54			close(link_fd[i]);
55		if (fexit_fd[i])
56			close(fexit_fd[i]);
57	}
58	free(fd);
59}
60