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bpf: Define enum bpf_core_relo_kind as uapi.

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enum bpf_core_relo_kind is generated by llvm and processed by libbpf.
It's a de-facto uapi.
With CO-RE in the kernel the bpf_core_relo_kind values become uapi de-jure.
Also rename them with BPF_CORE_ prefix to distinguish from conflicting names in
bpf_core_read.h. The enums bpf_field_info_kind, bpf_type_id_kind,
bpf_type_info_kind, bpf_enum_value_kind are passing different values from bpf
program into llvm.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211201181040.23337-5-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-12-01 10:10:27 -08:00 • committed by Andrii Nakryiko
parent 29db4bea1d
commit 46334a0cd2
5 changed files with 82 additions and 60 deletions
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19
tools/include/uapi/linux/bpf.h
View file

@ -6374,4 +6374,23 @@ enum {
BTF_F_ZERO = (1ULL << 3),
};
/* bpf_core_relo_kind encodes which aspect of captured field/type/enum value
* has to be adjusted by relocations. It is emitted by llvm and passed to
* libbpf and later to the kernel.
*/
enum bpf_core_relo_kind {
BPF_CORE_FIELD_BYTE_OFFSET = 0, /* field byte offset */
BPF_CORE_FIELD_BYTE_SIZE = 1, /* field size in bytes */
BPF_CORE_FIELD_EXISTS = 2, /* field existence in target kernel */
BPF_CORE_FIELD_SIGNED = 3, /* field signedness (0 - unsigned, 1 - signed) */
BPF_CORE_FIELD_LSHIFT_U64 = 4, /* bitfield-specific left bitshift */
BPF_CORE_FIELD_RSHIFT_U64 = 5, /* bitfield-specific right bitshift */
BPF_CORE_TYPE_ID_LOCAL = 6, /* type ID in local BPF object */
BPF_CORE_TYPE_ID_TARGET = 7, /* type ID in target kernel */
BPF_CORE_TYPE_EXISTS = 8, /* type existence in target kernel */
BPF_CORE_TYPE_SIZE = 9, /* type size in bytes */
BPF_CORE_ENUMVAL_EXISTS = 10, /* enum value existence in target kernel */
BPF_CORE_ENUMVAL_VALUE = 11, /* enum value integer value */
};
#endif /* _UAPI__LINUX_BPF_H__ */