On Fri, Jul 10, 2020 at 12:38 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote: > > hi, > this patchset does preparation work for adding d_path helper, > which still needs more work, but the initial set of patches > is ready and useful to have. > > This patchset adds: > - support to generate BTF ID lists that are resolved during > kernel linking and usable within kernel code with following > macros: > > BTF_ID_LIST(bpf_skb_output_btf_ids) > BTF_ID(struct, sk_buff) > > and access it in kernel code via: > extern u32 bpf_skb_output_btf_ids[]; > > - resolve_btfids tool that scans elf object for .BTF_ids > section and resolves its symbols with BTF ID values > - resolving of bpf_ctx_convert struct and several other > objects with BTF_ID_LIST > > v6 changes: > - added acks > - added general make rule to resolve_btfids Build [Andrii] > - renamed .BTF.ids to .BTF_ids [Andrii] > - added --no-fail option to resolve_btfids [Andrii] > - changed resolve_btfids test to work over BTF from object > file, so we don't depend on vmlinux BTF [Andrii] > - fixed few typos [Andrii] > - fixed the out of tree build [Andrii] > > Also available at: > https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git > bpf/d_path > > thanks, > jirka > > > --- You've missed fixing bpf_get_task_stack_proto with your BTF_IDS_LIST/BTF_ID macro. It's currently failing in subtests. With BTF_IDS_LIST/BTF_ID trivial fix it works again. Please fix that before this can be applied. btf_data.c could also use some name-conflicting entries, just to make sure that kind (struct vs typedef) is taken into account. Maybe just add some dummy `typedef int S;` or something? So with the above, please add for the next revision: Acked-by: Andrii Nakryiko <andriin@xxxxxx> Tested-by: Andrii Nakryiko <andriin@xxxxxx> > Jiri Olsa (9): > bpf: Add resolve_btfids tool to resolve BTF IDs in ELF object > bpf: Compile resolve_btfids tool at kernel compilation start > bpf: Add BTF_ID_LIST/BTF_ID/BTF_ID_UNUSED macros > bpf: Resolve BTF IDs in vmlinux image > bpf: Remove btf_id helpers resolving > bpf: Use BTF_ID to resolve bpf_ctx_convert struct > bpf: Add info about .BTF_ids section to btf.rst > tools headers: Adopt verbatim copy of btf_ids.h from kernel sources > selftests/bpf: Add test for resolve_btfids > > Documentation/bpf/btf.rst | 36 +++++ > Makefile | 25 +++- > include/asm-generic/vmlinux.lds.h | 4 + > include/linux/btf_ids.h | 87 ++++++++++++ > kernel/bpf/btf.c | 103 ++------------ > kernel/trace/bpf_trace.c | 9 +- > net/core/filter.c | 9 +- > scripts/link-vmlinux.sh | 6 + > tools/Makefile | 3 + > tools/bpf/Makefile | 9 +- > tools/bpf/resolve_btfids/Build | 10 ++ > tools/bpf/resolve_btfids/Makefile | 77 +++++++++++ > tools/bpf/resolve_btfids/main.c | 721 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > tools/include/linux/btf_ids.h | 87 ++++++++++++ > tools/include/linux/compiler.h | 4 + > tools/testing/selftests/bpf/Makefile | 14 +- > tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 107 ++++++++++++++ > tools/testing/selftests/bpf/progs/btf_data.c | 26 ++++ > 18 files changed, 1234 insertions(+), 103 deletions(-) > create mode 100644 include/linux/btf_ids.h > create mode 100644 tools/bpf/resolve_btfids/Build > create mode 100644 tools/bpf/resolve_btfids/Makefile > create mode 100644 tools/bpf/resolve_btfids/main.c > create mode 100644 tools/include/linux/btf_ids.h > create mode 100644 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c > create mode 100644 tools/testing/selftests/bpf/progs/btf_data.c >
