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author | Alexei Starovoitov <ast@kernel.org> | 2021-05-25 17:32:35 -0700 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2021-05-25 17:32:35 -0700 |
commit | 21703cf790c7aa0fd09e1d38df9a5d945244abf8 (patch) | |
tree | 5fd75a8338c75b97f64195d2bf77fccbd8819ce8 /kernel/bpf/devmap.c | |
parent | a720a2a0ad6cb6f769b6c7cbc3c54287a7d54ff8 (diff) | |
parent | 9c6c0449deb41dbe3a66ab9adfd08020bba6c43d (diff) | |
download | linux-21703cf790c7aa0fd09e1d38df9a5d945244abf8.tar.gz |
Merge branch 'libbpf: error reporting changes for v1.0'
Andrii Nakryiko says: ==================== Implement error reporting changes discussed in "Libbpf: the road to v1.0" ([0]) document. Libbpf gets a new API, libbpf_set_strict_mode() which accepts a set of flags that turn on a set of libbpf 1.0 changes, that might be potentially breaking. It's possible to opt-in into all current and future 1.0 features by specifying LIBBPF_STRICT_ALL flag. When some of the 1.0 "features" are requested, libbpf APIs might behave differently. In this patch set a first set of changes are implemented, all related to the way libbpf returns errors. See individual patches for details. Patch #1 adds a no-op libbpf_set_strict_mode() functionality to enable updating selftests. Patch #2 gets rid of all the bad code patterns that will break in libbpf 1.0 (exact -1 comparison for low-level APIs, direct IS_ERR() macro usage to check pointer-returning APIs for error, etc). These changes make selftest work in both legacy and 1.0 libbpf modes. Selftests also opt-in into 100% libbpf 1.0 mode to automatically gain all the subsequent changes, which will come in follow up patches. Patch #3 streamlines error reporting for low-level APIs wrapping bpf() syscall. Patch #4 streamlines errors for all the rest APIs. Patch #5 ensures that BPF skeletons propagate errors properly as well, as currently on error some APIs will return NULL with no way of checking exact error code. [0] https://docs.google.com/document/d/1UyjTZuPFWiPFyKk1tV5an11_iaRuec6U-ZESZ54nNTY v1->v2: - move libbpf_set_strict_mode() implementation to patch #1, where it belongs (Alexei); - add acks, slight rewording of commit messages. ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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