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libbpf: Complete field-based CO-RE helpers with field offset helper
Add bpf_core_field_offset() helper to complete field-based CO-RE helpers. This helper can be useful for feature-detection and for some more advanced cases of field reading (e.g., reading flexible array members). Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220509004148.1801791-6-andrii@kernel.org
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@ -143,6 +143,18 @@ enum bpf_enum_value_kind {
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#define bpf_core_field_size(field...) \
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__builtin_preserve_field_info(___bpf_field_ref(field), BPF_FIELD_BYTE_SIZE)
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/*
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* Convenience macro to get field's byte offset.
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*
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* Supports two forms:
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* - field reference through variable access:
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* bpf_core_field_offset(p->my_field);
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* - field reference through type and field names:
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* bpf_core_field_offset(struct my_type, my_field).
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*/
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#define bpf_core_field_offset(field...) \
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__builtin_preserve_field_info(___bpf_field_ref(field), BPF_FIELD_BYTE_OFFSET)
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/*
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* Convenience macro to get BTF type ID of a specified type, using a local BTF
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* information. Return 32-bit unsigned integer with type ID from program's own
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