Commit 5a2798ab32ba
("bpf: Add BTF_ID_LIST/BTF_ID/BTF_ID_UNUSED macros")
implemented a mechanism to compute btf_ids at kernel build
time which can simplify kernel implementation and reduce
runtime overhead by removing in-kernel btf_id calculation.
This patch set tried to use this mechanism to compute
btf_ids for bpf_skc_to_*() helpers and for btf_id_or_null ctx
arguments specified during bpf iterator registration.
Please see individual patch for details.
Changelogs:
v1 -> v2:
- v1 ([1]) is only for bpf_skc_to_*() helpers. This version
expanded it to cover ctx btf_id_or_null arguments
- abandoned the change of "extern u32 name[]" to
"static u32 name[]" for BPF_ID_LIST local "name" definition.
gcc 9 incurred a compilation error.
[1]: https://lore.kernel.org/bpf/20200717184706.3476992-1-yhs@xxxxxx/T
Yonghong Song (5):
bpf: compute bpf_skc_to_*() helper socket btf ids at build time
tools/bpf: sync btf_ids.h to tools
bpf: add BTF_ID_LIST_GLOBAL in btf_ids.h
bpf: make btf_sock_ids global
bpf: net: use precomputed btf_id for bpf iterators
include/linux/bpf.h | 5 +-
include/linux/btf_ids.h | 40 +++++++++++++--
kernel/bpf/btf.c | 6 +--
kernel/bpf/map_iter.c | 7 ++-
kernel/bpf/task_iter.c | 12 ++++-
net/core/filter.c | 49 ++----------------
net/ipv4/tcp_ipv4.c | 4 +-
net/ipv4/udp.c | 4 +-
net/ipv6/route.c | 7 ++-
net/netlink/af_netlink.c | 7 ++-
tools/include/linux/btf_ids.h | 51 +++++++++++++++++--
.../selftests/bpf/prog_tests/resolve_btfids.c | 34 ++++++++++---
12 files changed, 153 insertions(+), 73 deletions(-)
--
2.24.1
