1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <android-base/macros.h>
18 #include <gtest/gtest.h>
19 #include <stdlib.h>
20 #include <unistd.h>
21 #include <iostream>
22 #include "include/bpf/BpfMap.h"
23 #include "include/bpf/BpfUtils.h"
24 #include "include/libbpf_android.h"
25
26 using ::testing::Test;
27
28 constexpr const char tp_prog_path[] =
29 "/sys/fs/bpf/prog_bpf_load_tp_prog_tracepoint_sched_sched_switch";
30 constexpr const char tp_map_path[] = "/sys/fs/bpf/map_bpf_load_tp_prog_cpu_pid_map";
31
32 namespace android {
33 namespace bpf {
34
35 class BpfLoadTest : public testing::Test {
36 protected:
BpfLoadTest()37 BpfLoadTest() {}
38 int mProgFd;
39
SetUp()40 void SetUp() {
41 SKIP_IF_BPF_NOT_SUPPORTED;
42
43 unlink(tp_prog_path);
44 unlink(tp_map_path);
45
46 bool critical = true;
47 EXPECT_EQ(android::bpf::loadProg("/system/etc/bpf/bpf_load_tp_prog.o", &critical), 0);
48 EXPECT_EQ(false, critical);
49
50 mProgFd = bpf_obj_get(tp_prog_path);
51 EXPECT_GT(mProgFd, 0);
52
53 int ret = bpf_attach_tracepoint(mProgFd, "sched", "sched_switch");
54 EXPECT_NE(ret, 0);
55 }
56
TearDown()57 void TearDown() {
58 SKIP_IF_BPF_NOT_SUPPORTED;
59
60 close(mProgFd);
61 unlink(tp_prog_path);
62 unlink(tp_map_path);
63 }
64
checkMapNonZero()65 void checkMapNonZero() {
66 // The test program installs a tracepoint on sched:sched_switch
67 // and expects the kernel to populate a PID corresponding to CPU
68 android::bpf::BpfMap<uint32_t, uint32_t> m(tp_map_path);
69
70 // Wait for program to run a little
71 sleep(1);
72
73 int non_zero = 0;
74 const auto iterFunc = [&non_zero](const uint32_t& key, const uint32_t& val,
75 BpfMap<uint32_t, uint32_t>& map) {
76 if (val && !non_zero) {
77 non_zero = 1;
78 }
79
80 UNUSED(key);
81 UNUSED(map);
82 return base::Result<void>();
83 };
84
85 EXPECT_RESULT_OK(m.iterateWithValue(iterFunc));
86 EXPECT_EQ(non_zero, 1);
87 }
88 };
89
TEST_F(BpfLoadTest,bpfCheckMap)90 TEST_F(BpfLoadTest, bpfCheckMap) {
91 SKIP_IF_BPF_NOT_SUPPORTED;
92
93 checkMapNonZero();
94 }
95
96 } // namespace bpf
97 } // namespace android
98