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Support pinned maps through BPF_TABLE_PINNED macro
Define a map to be loaded from a pinned path through the new macro BPF_TABLE_PINNED(..., "/sys/fs/bpf/xyz"); instead of creating a new map. Internally the path is appended to the section attribute with a ':' delimiter.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Copyright (c) 2019 Kinvolk GmbH | ||
| * | ||
| * 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:https://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 <linux/version.h> | ||
| #include <unistd.h> | ||
| #include <string> | ||
| #include <sys/mount.h> | ||
|
|
||
| #include "BPF.h" | ||
| #include "catch.hpp" | ||
|
|
||
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) | ||
| TEST_CASE("test pinned table", "[pinned_table]") { | ||
| bool mounted = false; | ||
| if (system("mount | grep /sys/fs/bpf")) { | ||
| REQUIRE(system("mkdir -p /sys/fs/bpf") == 0); | ||
| REQUIRE(system("mount -o nosuid,nodev,noexec,mode=700 -t bpf bpf /sys/fs/bpf") == 0); | ||
| mounted = true; | ||
| } | ||
| // prepare test by pinning table to bpffs | ||
| { | ||
| const std::string BPF_PROGRAM = R"( | ||
| BPF_TABLE("hash", u64, u64, ids, 1024); | ||
| )"; | ||
|
|
||
| ebpf::BPF bpf; | ||
| ebpf::StatusTuple res(0); | ||
| res = bpf.init(BPF_PROGRAM); | ||
| REQUIRE(res.code() == 0); | ||
|
|
||
| REQUIRE(bpf_obj_pin(bpf.get_hash_table<int, int>("ids").get_fd(), "/sys/fs/bpf/test_pinned_table") == 0); | ||
| } | ||
|
|
||
| // test table access | ||
| { | ||
| const std::string BPF_PROGRAM = R"( | ||
| BPF_TABLE_PINNED("hash", u64, u64, ids, 1024, "/sys/fs/bpf/test_pinned_table"); | ||
| )"; | ||
|
|
||
| ebpf::BPF bpf; | ||
| ebpf::StatusTuple res(0); | ||
| res = bpf.init(BPF_PROGRAM); | ||
| unlink("/sys/fs/bpf/test_pinned_table"); // can delete table here already | ||
| REQUIRE(res.code() == 0); | ||
|
|
||
| auto t = bpf.get_hash_table<int, int>("ids"); | ||
| int key, value; | ||
|
|
||
| // write element | ||
| key = 0x08; | ||
| value = 0x43; | ||
| res = t.update_value(key, value); | ||
| REQUIRE(res.code() == 0); | ||
| REQUIRE(t[key] == value); | ||
| } | ||
|
|
||
| // test failure | ||
| { | ||
| const std::string BPF_PROGRAM = R"( | ||
| BPF_TABLE_PINNED("hash", u64, u64, ids, 1024, "/sys/fs/bpf/test_pinned_table"); | ||
| )"; | ||
|
|
||
| ebpf::BPF bpf; | ||
| ebpf::StatusTuple res(0); | ||
| res = bpf.init(BPF_PROGRAM); | ||
| REQUIRE(res.code() != 0); | ||
| } | ||
|
|
||
| if (mounted) { | ||
| REQUIRE(umount("/sys/fs/bpf") == 0); | ||
| } | ||
| } | ||
| #endif |