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.
In practice this will forbid unused dependencies because we run clippy
with `--deny warnings`.
Workspace lints is a nice place to ratchet up lints through the codebase
all at once and consistently.
Change FromRawTracepointArgs::arg to return T rather than *const T which
seems to have been returning a dangling pointer.
Arguably this is not strictly necessary; edition 2024 seems to be
focused on increased strictness around unsafe code which doesn't unlock
new functionality for our users. That said, this work revealed an
apparent bug (see above) that we wouldn't otherwise catch due to
allow-by-default lints.
Michal Rostecki
Tamir Duberstein
Dave Tucker
Alessandro Decina