include/bpf_elf.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BPF_ELF__
#define __BPF_ELF__

#include <asm/types.h>

/* Note:
 *
 * Below ELF section names and bpf_elf_map structure definition
 * are not (!) kernel ABI. It's rather a "contract" between the
 * application and the BPF loader in tc. For compatibility, the
 * section names should stay as-is. Introduction of aliases, if
 * needed, are a possibility, though.
 */

/* ELF section names, etc */
#define ELF_SECTION_LICENSE	"license"
#define ELF_SECTION_MAPS	"maps"
#define ELF_SECTION_PROG	"prog"
#define ELF_SECTION_CLASSIFIER	"classifier"
#define ELF_SECTION_ACTION	"action"

#define ELF_MAX_MAPS		64
#define ELF_MAX_LICENSE_LEN	128

/* Object pinning settings */
#define PIN_NONE		0
#define PIN_OBJECT_NS		1
#define PIN_GLOBAL_NS		2

/* ELF map definition */
struct bpf_elf_map {
	__u32 type;
	__u32 size_key;
	__u32 size_value;
	__u32 max_elem;
	__u32 flags;
	__u32 id;
	__u32 pinning;
	__u32 inner_id;
	__u32 inner_idx;
};

#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 = { }

#endif /* __BPF_ELF__ */