On Sun, May 23, 2021 at 11:36 PM John Fastabend <john.fastabend@xxxxxxxxx> wrote: > > Andrii Nakryiko wrote: > > 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 > > > > Andrii Nakryiko (5): > > libbpf: add libbpf_set_strict_mode() API to turn on libbpf 1.0 > > behaviors > > selftests/bpf: turn on libbpf 1.0 mode and fix all IS_ERR checks > > libbpf: streamline error reporting for low-level APIs > > libbpf: streamline error reporting for high-level APIs > > bpftool: set errno on skeleton failures and propagate errors > > > > LGTM for the series, > > Acked-by: John Fastabend <john.fastabend@xxxxxxxxx> Thanks, John! Toke, Stanislav, you cared about these aspects of libbpf 1.0 (by commenting on the doc itself), do you mind also taking a brief look and letting me know if this works for your use cases? Thanks!
