1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019 Facebook */
3 #include <test_progs.h>
4
serial_test_fexit_stress(void)5 void 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
51 out:
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
