This series is a major rework of previously submitted libbpf
patches [0] in order to add global data support for BPF. The
kernel has been extended to add proper infrastructure that allows
for full .bss/.data/.rodata sections on BPF loader side based
upon feedback from LPC discussions [1]. Latter support is then
also added into libbpf in this series which allows for more
natural C-like programming of BPF programs. For more information
on loader, please refer to 'bpf, libbpf: support global data/bss/
rodata sections' patch in this series.
Thanks a lot!
v3 -> v4:
- Various fixes in BTF verification e.g. to disallow
Var and DataSec to be an intermediate type during resolve (Martin)
- More BTF test cases added
- Few cleanups in key-less BTF commit (Martin)
- Bump libbpf minor version from 2 to 3
- Renamed and simplified read-only locking
- Various minor improvements all over the place
v2 -> v3:
- Implement BTF support in kernel, libbpf, bpftool, add tests
- Fix idx + off conversion (Andrii)
- Document lower / higher bits for direct value access (Andrii)
- Add tests with small value size (Andrii)
- Add index selection into ldimm64 (Andrii)
- Fix missing fdput() (Jann)
- Reject invalid flags in BPF_F_*_PROG (Jakub)
- Complete rework of libbpf support, includes:
- Add objname to map name (Stanislav)
- Make .rodata map full read-only after setup (Andrii)
- Merge relocation handling into single one (Andrii)
- Store global maps into obj->maps array (Andrii, Alexei)
- Debug message when skipping section (Andrii)
- Reject non-static global data till we have
semantics for sharing them (Yonghong, Andrii, Alexei)
- More test cases and completely reworked prog test (Alexei)
- Fixes, cleanups, etc all over the set
- Not yet addressed:
- Make BTF mandatory for these maps (Alexei)
-> Waiting till BTF support for these lands first
v1 -> v2:
- Instead of 32-bit static data, implement full global
data support (Alexei)
[0] https://patchwork.ozlabs.org/cover/1040290/
[1] http://vger.kernel.org/lpc-bpf2018.html#session-3
Daniel Borkmann (14):
bpf: implement lookup-free direct value access for maps
bpf: do not retain flags that are not tied to map lifetime
bpf: add program side {rd,wr}only support for maps
bpf: add syscall side map freeze support
bpf: allow . char as part of the object name
bpf: add specification for BTF Var and DataSec kinds
bpf: kernel side support for BTF Var and DataSec
bpf: allow for key-less BTF in array map
bpf: sync {btf,bpf}.h uapi header from tools infrastructure
bpf, libbpf: support global data/bss/rodata sections
bpf, libbpf: add support for BTF Var and DataSec
bpf: bpftool support for dumping data/bss/rodata sections
bpf, selftest: test {rd,wr}only flags and direct value access
bpf, selftest: add test cases for BTF Var and DataSec
Joe Stringer (2):
bpf, libbpf: refactor relocation handling
bpf, selftest: test global data/bss/rodata sections
Documentation/bpf/btf.rst | 57 ++
include/linux/bpf.h | 33 +-
include/linux/bpf_verifier.h | 4 +
include/linux/btf.h | 1 +
include/uapi/linux/bpf.h | 24 +-
include/uapi/linux/btf.h | 32 +-
kernel/bpf/arraymap.c | 50 +-
kernel/bpf/btf.c | 419 ++++++++++++-
kernel/bpf/core.c | 3 +-
kernel/bpf/disasm.c | 5 +-
kernel/bpf/hashtab.c | 6 +-
kernel/bpf/local_storage.c | 6 +-
kernel/bpf/lpm_trie.c | 3 +-
kernel/bpf/queue_stack_maps.c | 6 +-
kernel/bpf/syscall.c | 135 ++++-
kernel/bpf/verifier.c | 155 ++++-
tools/bpf/bpftool/btf_dumper.c | 59 ++
tools/bpf/bpftool/map.c | 10 +-
tools/bpf/bpftool/xlated_dumper.c | 6 +
tools/include/linux/filter.h | 14 +
tools/include/uapi/linux/bpf.h | 24 +-
tools/include/uapi/linux/btf.h | 32 +-
tools/lib/bpf/Makefile | 2 +-
tools/lib/bpf/bpf.c | 10 +
tools/lib/bpf/bpf.h | 1 +
tools/lib/bpf/btf.c | 97 ++-
tools/lib/bpf/btf.h | 3 +
tools/lib/bpf/libbpf.c | 546 ++++++++++++++---
tools/lib/bpf/libbpf.h | 5 +
tools/lib/bpf/libbpf.map | 7 +
tools/testing/selftests/bpf/bpf_helpers.h | 8 +-
.../testing/selftests/bpf/prog_tests/global_data.c | 157 +++++
.../testing/selftests/bpf/progs/test_global_data.c | 106 ++++
tools/testing/selftests/bpf/test_btf.c | 665 ++++++++++++++++++++-
tools/testing/selftests/bpf/test_verifier.c | 53 +-
.../testing/selftests/bpf/verifier/array_access.c | 159 +++++
.../selftests/bpf/verifier/direct_value_access.c | 262 ++++++++
37 files changed, 2951 insertions(+), 214 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/global_data.c
create mode 100644 tools/testing/selftests/bpf/progs/test_global_data.c
create mode 100644 tools/testing/selftests/bpf/verifier/direct_value_access.c
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2.9.5
