1*e4f7ac90SAndrii Nakryiko // SPDX-License-Identifier: GPL-2.0
2*e4f7ac90SAndrii Nakryiko /* Copyright (c) 2021 Facebook */
3*e4f7ac90SAndrii Nakryiko #include <test_progs.h>
4*e4f7ac90SAndrii Nakryiko #include "test_legacy_printk.skel.h"
5*e4f7ac90SAndrii Nakryiko
execute_one_variant(bool legacy)6*e4f7ac90SAndrii Nakryiko static int execute_one_variant(bool legacy)
7*e4f7ac90SAndrii Nakryiko {
8*e4f7ac90SAndrii Nakryiko struct test_legacy_printk *skel;
9*e4f7ac90SAndrii Nakryiko int err, zero = 0, my_pid = getpid(), res, map_fd;
10*e4f7ac90SAndrii Nakryiko
11*e4f7ac90SAndrii Nakryiko skel = test_legacy_printk__open();
12*e4f7ac90SAndrii Nakryiko if (!ASSERT_OK_PTR(skel, "skel_open"))
13*e4f7ac90SAndrii Nakryiko return -errno;
14*e4f7ac90SAndrii Nakryiko
15*e4f7ac90SAndrii Nakryiko bpf_program__set_autoload(skel->progs.handle_legacy, legacy);
16*e4f7ac90SAndrii Nakryiko bpf_program__set_autoload(skel->progs.handle_modern, !legacy);
17*e4f7ac90SAndrii Nakryiko
18*e4f7ac90SAndrii Nakryiko err = test_legacy_printk__load(skel);
19*e4f7ac90SAndrii Nakryiko /* no ASSERT_OK, we expect one of two variants can fail here */
20*e4f7ac90SAndrii Nakryiko if (err)
21*e4f7ac90SAndrii Nakryiko goto err_out;
22*e4f7ac90SAndrii Nakryiko
23*e4f7ac90SAndrii Nakryiko if (legacy) {
24*e4f7ac90SAndrii Nakryiko map_fd = bpf_map__fd(skel->maps.my_pid_map);
25*e4f7ac90SAndrii Nakryiko err = bpf_map_update_elem(map_fd, &zero, &my_pid, BPF_ANY);
26*e4f7ac90SAndrii Nakryiko if (!ASSERT_OK(err, "my_pid_map_update"))
27*e4f7ac90SAndrii Nakryiko goto err_out;
28*e4f7ac90SAndrii Nakryiko err = bpf_map_lookup_elem(map_fd, &zero, &res);
29*e4f7ac90SAndrii Nakryiko } else {
30*e4f7ac90SAndrii Nakryiko skel->bss->my_pid_var = my_pid;
31*e4f7ac90SAndrii Nakryiko }
32*e4f7ac90SAndrii Nakryiko
33*e4f7ac90SAndrii Nakryiko err = test_legacy_printk__attach(skel);
34*e4f7ac90SAndrii Nakryiko if (!ASSERT_OK(err, "skel_attach"))
35*e4f7ac90SAndrii Nakryiko goto err_out;
36*e4f7ac90SAndrii Nakryiko
37*e4f7ac90SAndrii Nakryiko usleep(1); /* trigger */
38*e4f7ac90SAndrii Nakryiko
39*e4f7ac90SAndrii Nakryiko if (legacy) {
40*e4f7ac90SAndrii Nakryiko map_fd = bpf_map__fd(skel->maps.res_map);
41*e4f7ac90SAndrii Nakryiko err = bpf_map_lookup_elem(map_fd, &zero, &res);
42*e4f7ac90SAndrii Nakryiko if (!ASSERT_OK(err, "res_map_lookup"))
43*e4f7ac90SAndrii Nakryiko goto err_out;
44*e4f7ac90SAndrii Nakryiko } else {
45*e4f7ac90SAndrii Nakryiko res = skel->bss->res_var;
46*e4f7ac90SAndrii Nakryiko }
47*e4f7ac90SAndrii Nakryiko
48*e4f7ac90SAndrii Nakryiko if (!ASSERT_GT(res, 0, "res")) {
49*e4f7ac90SAndrii Nakryiko err = -EINVAL;
50*e4f7ac90SAndrii Nakryiko goto err_out;
51*e4f7ac90SAndrii Nakryiko }
52*e4f7ac90SAndrii Nakryiko
53*e4f7ac90SAndrii Nakryiko err_out:
54*e4f7ac90SAndrii Nakryiko test_legacy_printk__destroy(skel);
55*e4f7ac90SAndrii Nakryiko return err;
56*e4f7ac90SAndrii Nakryiko }
57*e4f7ac90SAndrii Nakryiko
test_legacy_printk(void)58*e4f7ac90SAndrii Nakryiko void test_legacy_printk(void)
59*e4f7ac90SAndrii Nakryiko {
60*e4f7ac90SAndrii Nakryiko /* legacy variant should work everywhere */
61*e4f7ac90SAndrii Nakryiko ASSERT_OK(execute_one_variant(true /* legacy */), "legacy_case");
62*e4f7ac90SAndrii Nakryiko
63*e4f7ac90SAndrii Nakryiko /* execute modern variant, can fail the load on old kernels */
64*e4f7ac90SAndrii Nakryiko execute_one_variant(false);
65*e4f7ac90SAndrii Nakryiko }
66