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* selftests/bpf: Fix C++ compile error from missing _Bool typeTony Ambardar2024-07-301-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | While building, bpftool makes a skeleton from test_core_extern.c, which itself includes <stdbool.h> and uses the 'bool' type. However, the skeleton test_core_extern.skel.h generated *does not* include <stdbool.h> or use the 'bool' type, instead using the C-only '_Bool' type. Compiling test_cpp.cpp with g++ 12.3 for mips64el/musl-libc then fails with error: In file included from test_cpp.cpp:9: test_core_extern.skel.h:45:17: error: '_Bool' does not name a type 45 | _Bool CONFIG_BOOL; | ^~~~~ This was likely missed previously because glibc uses a GNU extension for <stdbool.h> with C++ (#define _Bool bool), not supported by musl libc. Normally, a C fragment would include <stdbool.h> and use the 'bool' type, and thus cleanly work after import by C++. The ideal fix would be for 'bpftool gen skeleton' to output the correct type/include supporting C++, but in the meantime add a conditional define as above. Fixes: 7c8dce4b1661 ("bpftool: Make skeleton C code compilable with C++ compiler") Signed-off-by: Tony Ambardar <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/6fc1dd28b8bda49e51e4f610bdc9d22f4455632d.1722244708.git.tony.ambardar@gmail.com
* bpftool: Cast pointers for shadow types explicitly.Kui-Feng Lee2024-03-141-0/+5
| | | | | | | | | | | | | | | | | According to a report, skeletons fail to assign shadow pointers when being compiled with C++ programs. Unlike C doing implicit casting for void pointers, C++ requires an explicit casting. To support C++, we do explicit casting for each shadow pointer. Also add struct_ops_module.skel.h to test_cpp to validate C++ compilation as part of BPF selftests. Signed-off-by: Kui-Feng Lee <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Acked-by: Yonghong Song <[email protected]> Acked-by: Quentin Monnet <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* Fix typos in selftest/bpf filesTaichi Nishimura2023-02-171-1/+1
| | | | | | | | | Run spell checker on files in selftest/bpf and fixed typos. Signed-off-by: Taichi Nishimura <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Reviewed-by: Randy Dunlap <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests/bpf: Make sure enum-less bpf_enable_stats() API works in C++ modeAndrii Nakryiko2022-11-301-3/+10
| | | | | | | | | Just a simple test to make sure we don't introduce unwanted compiler warnings and API still supports passing enums as input argument. Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests/bpf: Fix a clang deprecated-declarations compilation errorYonghong Song2022-02-201-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Build the kernel and selftest with clang compiler with LLVM=1, make -j LLVM=1 make -C tools/testing/selftests/bpf -j LLVM=1 I hit the following selftests/bpf compilation error: In file included from test_cpp.cpp:3: /.../tools/testing/selftests/bpf/tools/include/bpf/libbpf.h:73:8: error: 'relaxed_core_relocs' is deprecated: libbpf v0.6+: field has no effect [-Werror,-Wdeprecated-declarations] struct bpf_object_open_opts { ^ test_cpp.cpp:56:2: note: in implicit move constructor for 'bpf_object_open_opts' first required here LIBBPF_OPTS(bpf_object_open_opts, opts); ^ /.../tools/testing/selftests/bpf/tools/include/bpf/libbpf_common.h:77:3: note: expanded from macro 'LIBBPF_OPTS' (struct TYPE) { \ ^ /.../tools/testing/selftests/bpf/tools/include/bpf/libbpf.h:90:2: note: 'relaxed_core_relocs' has been explicitly marked deprecated here LIBBPF_DEPRECATED_SINCE(0, 6, "field has no effect") ^ /.../tools/testing/selftests/bpf/tools/include/bpf/libbpf_common.h:24:4: note: expanded from macro 'LIBBPF_DEPRECATED_SINCE' (LIBBPF_DEPRECATED("libbpf v" # major "." # minor "+: " msg)) ^ /.../tools/testing/selftests/bpf/tools/include/bpf/libbpf_common.h:19:47: note: expanded from macro 'LIBBPF_DEPRECATED' #define LIBBPF_DEPRECATED(msg) __attribute__((deprecated(msg))) There are two ways to fix the issue, one is to use GCC diagnostic ignore pragma, and the other is to open code bpf_object_open_opts instead of using LIBBPF_OPTS. Since in general LIBBPF_OPTS is preferred, the patch fixed the issue by adding proper GCC diagnostic ignore pragmas. Signed-off-by: Yonghong Song <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests/bpf: Add Skeleton templated wrapper as an exampleAndrii Nakryiko2022-02-151-2/+85
| | | | | | | | | | | | | | Add an example of how to build C++ template-based BPF skeleton wrapper. It's an actually runnable valid use of skeleton through more C++-like interface. Note that skeleton destuction happens implicitly through Skeleton<T>'s destructor. Also make test_cpp runnable as it would have crashed on invalid btf passed into btf_dump__new(). Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests/bpf: Add btf_dump__new to test_cppJiri Olsa2021-12-231-1/+8
| | | | | | | | | | Adding btf_dump__new call to test_cpp, so we can test C++ compilation with that. Signed-off-by: Jiri Olsa <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Acked-by: Yonghong Song <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests: Use consistent include paths for libbpfToke Høiland-Jørgensen2020-01-211-3/+3
| | | | | | | | | | | | | | | | Fix all selftests to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To not break the build, keep the old include path until everything has been changed to the new one; a subsequent patch will remove that. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Acked-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* bpftool: Make skeleton C code compilable with C++ compilerAndrii Nakryiko2019-12-271-0/+10
| | | | | | | | | | | | | | When auto-generated BPF skeleton C code is included from C++ application, it triggers compilation error due to void * being implicitly casted to whatever target pointer type. This is supported by C, but not C++. To solve this problem, add explicit casts, where necessary. To ensure issues like this are captured going forward, add skeleton usage in test_cpp test. Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
* selftests/bpf: Bring back c++ include/link testStanislav Fomichev2019-12-051-0/+20
Commit 5c26f9a78358 ("libbpf: Don't use cxx to test_libpf target") converted existing c++ test to c. We still want to include and link against libbpf from c++ code, so reinstate this test back, this time in a form of a selftest with a clear comment about its purpose. v2: * -lelf -> $(LDLIBS) (Andrii Nakryiko) Fixes: 5c26f9a78358 ("libbpf: Don't use cxx to test_libpf target") Signed-off-by: Stanislav Fomichev <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Acked-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
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