btf: bpf_core_type_matches is now supported

Programs can now use bpf_core_type_matches() for a stricter compatibility check. See https://github.com/cilium/ebpf/pull/1366.

program, btf: improve debuggability when CO-RE or kfunc fixup fails

The library now tries to return a more informative error when loading a program fails due to a failed CO-RE relocation or a missing kfunc. See https://github.com/cilium/ebpf/pull/1402.

btf: synthesise instruction comments into line info

asm.Comment in an instruction's Source() are now passed to the kernel in the form of BTF line info. See https://github.com/cilium/ebpf/pull/1417.

perf: add WakeupEvents support to Reader

A perf Reader can now be configured to be woken up after a specific number of events / samples have been submitted. See https://github.com/cilium/ebpf/pull/1404.

Bugfixes

• program: fix loading a program which targets a function in a kernel module when CONFIG_DEBUG_INFO_BTF_MODULES is disabled, see #1440.

Breaking changes

github.com/cilium/ebpf/btf

• Copy: the transform argument was removed. Use the new btf.As function instead.
• Transformer: removed. See above.

What's Changed

• btf: use recursion by @lmb in https://github.com/cilium/ebpf/pull/1397
• gh: hopefully fix apidiff workflow by @lmb in https://github.com/cilium/ebpf/pull/1401
• gh: only cancel pull_request runs by @lmb in https://github.com/cilium/ebpf/pull/1403
• build(deps): bump pymdown-extensions from 10.7 to 10.7.1 in /docs by @dependabot in https://github.com/cilium/ebpf/pull/1410
• build(deps): bump mkdocs-git-authors-plugin from 0.7.2 to 0.8.0 in /docs by @dependabot in https://github.com/cilium/ebpf/pull/1411
• build(deps): bump mkdocs-material from 9.5.12 to 9.5.16 in /docs by @dependabot in https://github.com/cilium/ebpf/pull/1409
• program, btf: improve debuggability when CO-RE or kfunc fixup fails by @lmb in https://github.com/cilium/ebpf/pull/1402
• add WakeupEvents support to perf Reader by @brycekahle in https://github.com/cilium/ebpf/pull/1404
• Extend go test CI from 10 to 15 miniutes by @dylandreimerink in https://github.com/cilium/ebpf/pull/1418
• btf: synthesise instruction comments into line info by @MarcusWichelmann in https://github.com/cilium/ebpf/pull/1417
• Add support to retrieve missed counts from probes by @olsajiri in https://github.com/cilium/ebpf/pull/1295
• perf: fix TestPerfReaderWakeupEvents by @lmb in https://github.com/cilium/ebpf/pull/1423
• Don't mention inexistent outLen parameter in (*Program).Test godoc by @tklauser in https://github.com/cilium/ebpf/pull/1426
• btf: refuse reloTypeIDTarget for kmod types by @lmb in https://github.com/cilium/ebpf/pull/1422
• when ringbuffer map size is not a power-of-2 multiple of page size, prompt users in a user-friendly way by @hengyoush in https://github.com/cilium/ebpf/pull/1420
• btf: Add support for bpf_core_type_matches() by @dylandreimerink in https://github.com/cilium/ebpf/pull/1366
• Define LookupLock by means of BPF_F_LOCK by @tklauser in https://github.com/cilium/ebpf/pull/1428
• build(deps): bump idna from 3.6 to 3.7 in /docs by @dependabot in https://github.com/cilium/ebpf/pull/1431
• fix function name by @looklose in https://github.com/cilium/ebpf/pull/1427
• doc: rephrase supported kernel versions by @lmb in https://github.com/cilium/ebpf/pull/1439
• Use latest Go version for ARM64 and VM tests in CI by @tklauser in https://github.com/cilium/ebpf/pull/1430
• program: don't return error when kmod BTF is disabled by @orishuss in https://github.com/cilium/ebpf/pull/1440

New Contributors

• @hengyoush made their first contribution in https://github.com/cilium/ebpf/pull/1420
• @looklose made their first contribution in https://github.com/cilium/ebpf/pull/1427
• @orishuss made their first contribution in https://github.com/cilium/ebpf/pull/1440

Full Changelog: https://github.com/cilium/ebpf/compare/v0.14.0...v0.15.0