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. Joint work with Joe Stringer.
Thanks a lot!
Note, since merge window is still open, sending as rfc to dump
current progress I have from last v2 series, final v3 will go
out once bpf-next is open again.
v2 -> rfc v3:
- 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 (7):
bpf: implement lookup-free direct value access for maps
bpf: add program side {rd,wr}only support for maps
bpf: add syscall side map lock support
bpf, obj: allow . char as part of the name
bpf: sync bpf.h uapi header from tools infrastructure
bpf, libbpf: support global data/bss/rodata sections
bpf, selftest: test {rd,wr}only flags and direct value access
Joe Stringer (2):
bpf, libbpf: refactor relocation handling
bpf, selftest: test global data/bss/rodata sections
include/linux/bpf.h | 35 +-
include/linux/bpf_verifier.h | 4 +
include/uapi/linux/bpf.h | 24 +-
kernel/bpf/arraymap.c | 32 +-
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 | 111 ++++-
kernel/bpf/verifier.c | 155 +++++--
tools/bpf/bpftool/xlated_dumper.c | 6 +
tools/include/linux/filter.h | 14 +
tools/include/uapi/linux/bpf.h | 24 +-
tools/lib/bpf/bpf.c | 10 +
tools/lib/bpf/bpf.h | 1 +
tools/lib/bpf/libbpf.c | 378 ++++++++++++++----
tools/lib/bpf/libbpf.h | 1 +
tools/lib/bpf/libbpf.map | 6 +
tools/testing/selftests/bpf/bpf_helpers.h | 8 +-
.../selftests/bpf/prog_tests/global_data.c | 157 ++++++++
.../selftests/bpf/progs/test_global_data.c | 106 +++++
tools/testing/selftests/bpf/test_verifier.c | 42 +-
.../selftests/bpf/verifier/array_access.c | 159 ++++++++
.../bpf/verifier/direct_value_access.c | 226 +++++++++++
26 files changed, 1382 insertions(+), 146 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
--
2.17.1
