RFC patch set revamping anonymous substructs of union bpf_attr, which would allow nicer and more coherent evolution of bpf() syscall arguments, especially for commands like BPF_MAP_CREATE and BPF_PROG_LOAD. See patch #1 for justification and more details. Patch #2 demonstrates how straightforward it is to switch to new-style substricts in kernel code (and keep in mind that this is optional until we need some new field for a given command, so we can do it completely asynchronously from landing bpf_attr changes themselves). Patch #3 shows also similar libbpf changes, except for libbpf single patches switches over entire libbpf code base to new-style substructs (except skel_internal.h, due to concerns that users might be reliant on outdated system-wide linux/bpf.h UAPI header). Andrii Nakryiko (3): bpf: revamp bpf_attr and name each command's field and substruct bpf: use new named bpf_attr substructs for few commands libbpf: use new bpf_xxx_attr structs for bpf() commands include/uapi/linux/bpf.h | 235 +++++++++++++++++---- kernel/bpf/syscall.c | 77 ++++--- tools/include/uapi/linux/bpf.h | 235 +++++++++++++++++---- tools/lib/bpf/bpf.c | 355 ++++++++++++++++---------------- tools/lib/bpf/gen_loader.c | 78 +++---- tools/lib/bpf/libbpf.c | 4 +- tools/lib/bpf/libbpf_internal.h | 2 +- 7 files changed, 641 insertions(+), 345 deletions(-) -- 2.34.1
