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| author |   Shuyi Cheng <chengshuyi@linux.alibaba.com> | 2021-07-13 20:42:37 +0800 |
|---|---|---|
| committer |   Andrii Nakryiko <andrii@kernel.org> | 2021-07-16 13:22:47 -0700 |
| commit | 1373ff59955621b7e71e7a1152036c93a5780c11 (patch) | |
| tree | 2905be756fe7083580ecb2f3b8a0aef55c2ee016 /tools/lib/bpf/libbpf.h | |
| parent | bpf, doc: Add heading and example for extensions in cbpf (diff) | |
| download | linux-dev-1373ff59955621b7e71e7a1152036c93a5780c11.tar.xz linux-dev-1373ff59955621b7e71e7a1152036c93a5780c11.zip | |
libbpf: Introduce 'btf_custom_path' to 'bpf_obj_open_opts'
btf_custom_path allows developers to load custom BTF which libbpf will
subsequently use for CO-RE relocation instead of vmlinux BTF.
Having btf_custom_path in bpf_object_open_opts one can directly use the
skeleton's <objname>_bpf__open_opts() API to pass in the btf_custom_path
parameter, as opposed to using bpf_object__load_xattr() which is slated to be
deprecated ([0]).
This work continues previous work started by another developer ([1]).
[0] https://lore.kernel.org/bpf/CAEf4BzbJZLjNoiK8_VfeVg_Vrg=9iYFv+po-38SMe=UzwDKJ=Q@mail.gmail.com/#t
[1] https://yhbt.net/lore/all/CAEf4Bzbgw49w2PtowsrzKQNcxD4fZRE6AKByX-5-dMo-+oWHHA@mail.gmail.com/
Signed-off-by: Shuyi Cheng <chengshuyi@linux.alibaba.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1626180159-112996-2-git-send-email-chengshuyi@linux.alibaba.com
Diffstat (limited to 'tools/lib/bpf/libbpf.h')
| -rw-r--r-- | tools/lib/bpf/libbpf.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 6e61342ba56c..6b08c1023609 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -94,8 +94,15 @@ struct bpf_object_open_opts { * system Kconfig for CONFIG_xxx externs. */ const char *kconfig; + /* Path to the custom BTF to be used for BPF CO-RE relocations. + * This custom BTF completely replaces the use of vmlinux BTF + * for the purpose of CO-RE relocations. + * NOTE: any other BPF feature (e.g., fentry/fexit programs, + * struct_ops, etc) will need actual kernel BTF at /sys/kernel/btf/vmlinux. + */ + const char *btf_custom_path; }; -#define bpf_object_open_opts__last_field kconfig +#define bpf_object_open_opts__last_field btf_custom_path LIBBPF_API struct bpf_object *bpf_object__open(const char *path); LIBBPF_API struct bpf_object * |