This patch introduces BPF Type Format (BTF). BTF (BPF Type Format) is the meta data format which describes the data types of BPF program/map. Hence, it basically focus on the C programming language which the modern BPF is primary using. The first use case is to provide a generic pretty print capability for a BPF map.
A modified pahole that can convert dwarf to BTF is here: https://github.com/iamkafai/pahole/tree/btf Please see individual patch for details. Martin KaFai Lau (10): bpf: btf: Introduce BPF Type Format (BTF) bpf: btf: Validate type reference bpf: btf: Check members of struct/union bpf: btf: Add pretty print capability for data with BTF type info bpf: btf: Add BPF_BTF_LOAD command bpf: btf: Add BPF_OBJ_GET_INFO_BY_FD support to BTF fd bpf: btf: Add pretty print support to the basic arraymap bpf: btf: Sync bpf.h and btf.h to tools/ bpf: btf: Add BTF support to libbpf bpf: btf: Add BTF tests include/linux/bpf.h | 20 +- include/linux/btf.h | 48 + include/uapi/linux/bpf.h | 12 + include/uapi/linux/btf.h | 132 ++ kernel/bpf/Makefile | 1 + kernel/bpf/arraymap.c | 50 + kernel/bpf/btf.c | 2064 ++++++++++++++++++++++++++ kernel/bpf/inode.c | 146 +- kernel/bpf/syscall.c | 51 +- tools/include/uapi/linux/bpf.h | 13 + tools/include/uapi/linux/btf.h | 132 ++ tools/lib/bpf/Build | 2 +- tools/lib/bpf/bpf.c | 92 +- tools/lib/bpf/bpf.h | 16 + tools/lib/bpf/btf.c | 377 +++++ tools/lib/bpf/btf.h | 22 + tools/lib/bpf/libbpf.c | 148 +- tools/lib/bpf/libbpf.h | 3 + tools/testing/selftests/bpf/Makefile | 25 +- tools/testing/selftests/bpf/test_btf.c | 1539 +++++++++++++++++++ tools/testing/selftests/bpf/test_btf_haskv.c | 48 + tools/testing/selftests/bpf/test_btf_nokv.c | 43 + 22 files changed, 4943 insertions(+), 41 deletions(-) create mode 100644 include/linux/btf.h create mode 100644 include/uapi/linux/btf.h create mode 100644 kernel/bpf/btf.c create mode 100644 tools/include/uapi/linux/btf.h create mode 100644 tools/lib/bpf/btf.c create mode 100644 tools/lib/bpf/btf.h create mode 100644 tools/testing/selftests/bpf/test_btf.c create mode 100644 tools/testing/selftests/bpf/test_btf_haskv.c create mode 100644 tools/testing/selftests/bpf/test_btf_nokv.c -- 2.9.5
