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