Some BPF programs compiled on s390 fail to load, because s390
arch-specific linux headers contain float and double types.
Introduce support for such types by representing them using the new
BTF_KIND_FLOAT. This series deals with libbpf, bpftool, in-kernel BTF
parser as well as selftests and documentation.
There are also pahole and LLVM parts:
* https://github.com/iii-i/dwarves/commit/btf-kind-float-v1
* https://reviews.llvm.org/D83289
but they should go in after the libbpf part is integrated.
There is also an open question: should we go forward with
BTF_KIND_FLOAT, or should this be merely a BTF_KIND_INT encoding? The
argument for BTF_KIND_FLOAT is that it's more explicit and therefore
less prone to unintentional mixups. The argument for BTF_KIND_INT
encoding is that there would be less code and the overall integration
process would be simpler.
Ilya Leoshkevich (6):
bpf: Add BTF_KIND_FLOAT to uapi
libbpf: Add BTF_KIND_FLOAT support
tools/bpftool: Add BTF_KIND_FLOAT support
bpf: Add BTF_KIND_FLOAT support
selftest/bpf: Add BTF_KIND_FLOAT tests
bpf: Document BTF_KIND_FLOAT in btf.rst
Documentation/bpf/btf.rst | 19 ++-
include/uapi/linux/btf.h | 10 +-
kernel/bpf/btf.c | 101 ++++++++++++-
tools/bpf/bpftool/btf.c | 13 ++
tools/bpf/bpftool/btf_dumper.c | 1 +
tools/include/uapi/linux/btf.h | 10 +-
tools/lib/bpf/btf.c | 85 ++++++++---
tools/lib/bpf/btf.h | 13 ++
tools/lib/bpf/btf_dump.c | 4 +
tools/lib/bpf/libbpf.c | 32 +++-
tools/lib/bpf/libbpf.map | 5 +
tools/lib/bpf/libbpf_internal.h | 4 +
tools/testing/selftests/bpf/btf_helpers.c | 4 +
tools/testing/selftests/bpf/prog_tests/btf.c | 145 +++++++++++++++++++
tools/testing/selftests/bpf/test_btf.h | 5 +
15 files changed, 418 insertions(+), 33 deletions(-)
--
2.29.2
