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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/file.h>
#include <android-base/macros.h>
#include <gtest/gtest.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
#include "bpf/BpfMap.h"
#include "bpf/BpfUtils.h"
#include "include/libbpf_android.h"
using ::testing::TestWithParam;
namespace android {
namespace bpf {
class BpfLoadTest : public TestWithParam<std::string> {
protected:
BpfLoadTest() {}
int mProgFd;
std::string mTpProgPath;
std::string mTpNeverLoadProgPath;
std::string mTpMapPath;;
void SetUp() {
mTpProgPath = "/sys/fs/bpf/prog_" + GetParam() + "_tracepoint_sched_sched_switch";
unlink(mTpProgPath.c_str());
mTpNeverLoadProgPath = "/sys/fs/bpf/prog_" + GetParam() + "_tracepoint_sched_sched_wakeup";
unlink(mTpNeverLoadProgPath.c_str());
mTpMapPath = "/sys/fs/bpf/map_" + GetParam() + "_cpu_pid_map";
unlink(mTpMapPath.c_str());
auto progPath = android::base::GetExecutableDirectory() + "/" + GetParam() + ".o";
bool critical = true;
bpf_prog_type kAllowed[] = {
BPF_PROG_TYPE_UNSPEC,
};
Location loc = {
.dir = "",
.prefix = "",
.allowedDomainBitmask = 0,
.allowedProgTypes = kAllowed,
.allowedProgTypesLength = arraysize(kAllowed),
};
EXPECT_EQ(android::bpf::loadProg(progPath.c_str(), &critical, loc), -1);
EXPECT_EQ(android::bpf::loadProg(progPath.c_str(), &critical), 0);
EXPECT_EQ(false, critical);
mProgFd = bpf_obj_get(mTpProgPath.c_str());
EXPECT_GT(mProgFd, 0);
int ret = bpf_attach_tracepoint(mProgFd, "sched", "sched_switch");
EXPECT_NE(ret, 0);
}
void TearDown() {
close(mProgFd);
unlink(mTpProgPath.c_str());
unlink(mTpMapPath.c_str());
}
void checkMapNonZero() {
// The test program installs a tracepoint on sched:sched_switch
// and expects the kernel to populate a PID corresponding to CPU
android::bpf::BpfMap<uint32_t, uint32_t> m(mTpMapPath.c_str());
// Wait for program to run a little
sleep(1);
int non_zero = 0;
const auto iterFunc = [&non_zero](const uint32_t& key, const uint32_t& val,
BpfMap<uint32_t, uint32_t>& map) {
if (val && !non_zero) {
non_zero = 1;
}
UNUSED(key);
UNUSED(map);
return base::Result<void>();
};
EXPECT_RESULT_OK(m.iterateWithValue(iterFunc));
EXPECT_EQ(non_zero, 1);
}
void checkMapBtf() {
// Earlier kernels lack BPF_BTF_LOAD support
if (!isAtLeastKernelVersion(4, 19, 0)) GTEST_SKIP() << "pre-4.19 kernel does not support BTF";
const bool haveBtf = GetParam().find("Btf") != std::string::npos;
std::string str;
EXPECT_EQ(android::base::ReadFileToString(mTpMapPath, &str), haveBtf);
if (haveBtf) EXPECT_FALSE(str.empty());
}
void checkKernelVersionEnforced() {
EXPECT_EQ(bpf_obj_get(mTpNeverLoadProgPath.c_str()), -1);
EXPECT_EQ(errno, ENOENT);
}
};
INSTANTIATE_TEST_SUITE_P(BpfLoadTests, BpfLoadTest,
::testing::Values("bpfLoadTpProg", "bpfLoadTpProgBtf"));
TEST_P(BpfLoadTest, bpfCheckMap) {
checkMapNonZero();
}
TEST_P(BpfLoadTest, bpfCheckBtf) {
checkMapBtf();
}
TEST_P(BpfLoadTest, bpfCheckMinKernelVersionEnforced) {
checkKernelVersionEnforced();
}
} // namespace bpf
} // namespace android
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