The BPF_F_PREORDER attach flag changes the ordering of programs in the effective cgroup program array, but BPF_PROG_QUERY did not report the per-program flag. This series exposes that state and updates bpftool to display, accept, and document this flag.
The series is split into three patches: 1. Report BPF_F_PREORDER in direct cgroup program queries. 2. Add selftests for direct and link-based program queries. 3. Add bpftool support for text, JSON, command-line, completion, and documentation handling of BPF_F_PREORDER. Changes in v3: - Simplify the changelogs for patches 1 and 2. - Simplify the ATTACH_FLAGS synopsis and represent attach flags as an array in JSON output, as suggested by Quentin Monnet. - Widen the plain-text AttachFlags column for combined flags. - Address checkpatch line-length and alignment warnings. Testing: - PASS: cgroup_mprog_opts, cgroup_preorder, and bpftool cgroup plain-text/JSON smoke (x86_64 QEMU/KVM). - PASS: bpftool build, Documentation build, bash -n, and checkpatch on generated v3 patches. Previous versions: v2: https://lore.kernel.org/bpf/[email protected]/ v1: https://lore.kernel.org/bpf/[email protected]/ Hui Su (3): bpf: Report BPF_F_PREORDER in cgroup program queries selftests/bpf: Test querying BPF_F_PREORDER cgroup attachments bpftool: Add support for BPF_F_PREORDER cgroup attach flag kernel/bpf/cgroup.c | 16 +-- .../bpftool/Documentation/bpftool-cgroup.rst | 25 +++-- tools/bpf/bpftool/bash-completion/bpftool | 4 +- tools/bpf/bpftool/cgroup.c | 99 +++++++++++++------ .../bpf/prog_tests/cgroup_mprog_opts.c | 71 ++++++++++++- 5 files changed, 166 insertions(+), 49 deletions(-) base-commit: 79dc258c9392051420a26f1504c647bd3d27c66a -- 2.55.0
