| Message ID | 20200720163358.1392964-1-yhs@fb.com |
|---|---|
| Headers | show |
| Series | bpf: compute btf_ids at build time for btf_iter | expand |
On Mon, Jul 20, 2020 at 09:33:58AM -0700, Yonghong Song wrote: > 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@fb.com/T Applied, Thanks
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@fb.com/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(-)