Before this change, Aya supported only legacy BPF map definitions, which
are instances of the `bpf_map_def` struct and end up in the `maps` ELF
section. This change introduces BTF maps, with custom structs indicating
the metadata of the map, which end up in the `.maps` section.
Legacy maps are not supported by libbpf anymore and not even by the
kernel for newer types of maps like inode/task storage.
Add support of BTF maps in aya-ebpf under the `btf-maps` feature flag.
Usage of this feature requires emitting debug info for the eBPF crate
and passing the `--btf` flag to bpf-linker.
And BpfLoader to EbpfLoader.
This also adds type aliases to preserve the use of the old names, making
updating to a new Aya release less of a burden. These aliases are marked
as deprecated since we'll likely remove them in a later release.
Signed-off-by: Dave Tucker <dave@dtucker.co.uk>
This implements the userspace binding for RingBuf.
Instead of streaming the samples as heap buffers, the process_ring
function takes a callback to which we pass the event's byte region,
roughly following [libbpf]'s API design. This avoids a copy and allows
marking the consumer pointer in a timely manner.
[libbpf]: https://github.com/libbpf/libbpf/blob/master/src/ringbuf.c
Additionally, integration tests are added to demonstrate the usage
of the new APIs and to ensure that they work end-to-end.
Co-authored-by: William Findlay <william@williamfindlay.com>
Co-authored-by: Tatsuyuki Ishi <ishitatsuyuki@gmail.com>
Michal Rostecki
Tamir Duberstein
Dave Tucker
Alessandro Decina
Andrew Werner