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!
v1 -> v2:
- Instead of 32-bit static data, implement full global
data support.
[0] https://patchwork.ozlabs.org/cover/1040290/
[1] http://vger.kernel.org/lpc-bpf2018.html#session-3
Daniel Borkmann (5):
bpf: implement lookup-free direct value access
bpf: add program side {rd,wr}only support
bpf, obj: allow . char as part of the name
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 | 24 ++
include/linux/bpf_verifier.h | 4 +
include/uapi/linux/bpf.h | 16 +-
kernel/bpf/arraymap.c | 35 +-
kernel/bpf/core.c | 3 +-
kernel/bpf/disasm.c | 5 +-
kernel/bpf/hashtab.c | 2 +-
kernel/bpf/local_storage.c | 2 +-
kernel/bpf/lpm_trie.c | 2 +-
kernel/bpf/queue_stack_maps.c | 3 +-
kernel/bpf/syscall.c | 35 +-
kernel/bpf/verifier.c | 103 ++++--
tools/bpf/bpftool/xlated_dumper.c | 3 +
tools/include/linux/filter.h | 19 +-
tools/include/uapi/linux/bpf.h | 16 +-
tools/lib/bpf/libbpf.c | 321 ++++++++++++++----
tools/testing/selftests/bpf/bpf_helpers.h | 2 +-
.../selftests/bpf/progs/test_global_data.c | 61 ++++
tools/testing/selftests/bpf/test_progs.c | 50 +++
tools/testing/selftests/bpf/test_verifier.c | 40 ++-
.../selftests/bpf/verifier/array_access.c | 159 +++++++++
.../bpf/verifier/direct_value_access.c | 170 ++++++++++
22 files changed, 955 insertions(+), 120 deletions(-)
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
