1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2019 Facebook */
3 #include <test_progs.h>
4 #include <linux/bpf.h>
5 #include "bpf/libbpf_internal.h"
6 #include "test_raw_tp_test_run.skel.h"
7 
test_raw_tp_test_run(void)8 void test_raw_tp_test_run(void)
9 {
10 	int comm_fd = -1, err, nr_online, i, prog_fd;
11 	__u64 args[2] = {0x1234ULL, 0x5678ULL};
12 	int expected_retval = 0x1234 + 0x5678;
13 	struct test_raw_tp_test_run *skel;
14 	char buf[] = "new_name";
15 	bool *online = NULL;
16 	LIBBPF_OPTS(bpf_test_run_opts, opts,
17 		.ctx_in = args,
18 		.ctx_size_in = sizeof(args),
19 		.flags = BPF_F_TEST_RUN_ON_CPU,
20 	);
21 
22 	err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online,
23 				  &nr_online);
24 	if (!ASSERT_OK(err, "parse_cpu_mask_file"))
25 		return;
26 
27 	skel = test_raw_tp_test_run__open_and_load();
28 	if (!ASSERT_OK_PTR(skel, "skel_open"))
29 		goto cleanup;
30 
31 	err = test_raw_tp_test_run__attach(skel);
32 	if (!ASSERT_OK(err, "skel_attach"))
33 		goto cleanup;
34 
35 	comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
36 	if (!ASSERT_GE(comm_fd, 0, "open /proc/self/comm"))
37 		goto cleanup;
38 
39 	err = write(comm_fd, buf, sizeof(buf));
40 	ASSERT_GE(err, 0, "task rename");
41 
42 	ASSERT_NEQ(skel->bss->count, 0, "check_count");
43 	ASSERT_EQ(skel->data->on_cpu, 0xffffffff, "check_on_cpu");
44 
45 	prog_fd = bpf_program__fd(skel->progs.rename);
46 	opts.ctx_in = args;
47 	opts.ctx_size_in = sizeof(__u64);
48 
49 	err = bpf_prog_test_run_opts(prog_fd, &opts);
50 	ASSERT_NEQ(err, 0, "test_run should fail for too small ctx");
51 
52 	opts.ctx_size_in = sizeof(args);
53 	err = bpf_prog_test_run_opts(prog_fd, &opts);
54 	ASSERT_OK(err, "test_run");
55 	ASSERT_EQ(opts.retval, expected_retval, "check_retval");
56 
57 	for (i = 0; i < nr_online; i++) {
58 		if (!online[i])
59 			continue;
60 
61 		opts.cpu = i;
62 		opts.retval = 0;
63 		err = bpf_prog_test_run_opts(prog_fd, &opts);
64 		ASSERT_OK(err, "test_run_opts");
65 		ASSERT_EQ(skel->data->on_cpu, i, "check_on_cpu");
66 		ASSERT_EQ(opts.retval, expected_retval, "check_retval");
67 	}
68 
69 	/* invalid cpu ID should fail with ENXIO */
70 	opts.cpu = 0xffffffff;
71 	err = bpf_prog_test_run_opts(prog_fd, &opts);
72 	ASSERT_EQ(errno, ENXIO, "test_run_opts should fail with ENXIO");
73 	ASSERT_ERR(err, "test_run_opts_fail");
74 
75 	/* non-zero cpu w/o BPF_F_TEST_RUN_ON_CPU should fail with EINVAL */
76 	opts.cpu = 1;
77 	opts.flags = 0;
78 	err = bpf_prog_test_run_opts(prog_fd, &opts);
79 	ASSERT_EQ(errno, EINVAL, "test_run_opts should fail with EINVAL");
80 	ASSERT_ERR(err, "test_run_opts_fail");
81 
82 cleanup:
83 	close(comm_fd);
84 	test_raw_tp_test_run__destroy(skel);
85 	free(online);
86 }
87