bpf_legacy.h
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bpf_legacy.h
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	/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
	#ifndef __BPF_LEGACY__
	#define __BPF_LEGACY__

	/*
	* legacy bpf_map_def with extra fields supported only by bpf_load(), do not
	* use outside of samples/bpf
	*/
	struct bpf_map_def_legacy {
	unsigned int type;
	unsigned int key_size;
	unsigned int value_size;
	unsigned int max_entries;
	unsigned int map_flags;
	unsigned int inner_map_idx;
	unsigned int numa_node;
	};

	#define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val) \
	struct ____btf_map_##name { \
	type_key key; \
	type_val value; \
	}; \
	struct ____btf_map_##name \
	__attribute__ ((section(".maps." #name), used)) \
	____btf_map_##name = { }

	/* llvm builtin functions that eBPF C program may use to
	* emit BPF_LD_ABS and BPF_LD_IND instructions
	*/
	unsigned long long load_byte(void *skb,
	unsigned long long off) asm("llvm.bpf.load.byte");
	unsigned long long load_half(void *skb,
	unsigned long long off) asm("llvm.bpf.load.half");
	unsigned long long load_word(void *skb,
	unsigned long long off) asm("llvm.bpf.load.word");

	#endif