| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| #pragma once |
| |
| /* libbpf has been moving quickly. |
| * They added new symbols in the 0.x versions and shortly after removed |
| * deprecated symbols in 1.0. |
| * We only need bpf_map_create and libbpf_probe_bpf_prog_type so we work |
| * around the incompatibility here by: |
| * - declaring both symbols, and looking for either depending on the libbpf |
| * so version we found |
| * - having helpers that automatically use the appropriate version behind the |
| * new API for easy cleanup later |
| * |
| * The advantage of doing this instead of only looking for the symbols declared at |
| * compile time is that we can then load either the old or the new symbols at runtime |
| * regardless of the version we were compiled with */ |
| |
| |
| /* declare the struct for libbpf <= 0.6.0 -- it causes no harm on newer versions */ |
| struct bpf_map_create_opts; |
| |
| /* new symbols available from 0.7.0. |
| * We need the symbols here: |
| * - after bpf_map_create_opts struct has been defined for older libbpf |
| * - before the compat static inline helpers that use them. |
| * When removing this file move these back to bpf-dlopen.h */ |
| extern int (*sym_bpf_map_create)(enum bpf_map_type, const char *, __u32, __u32, __u32, const struct bpf_map_create_opts *); |
| extern int (*sym_libbpf_probe_bpf_prog_type)(enum bpf_prog_type, const void *); |
| |
| /* compat symbols removed in libbpf 1.0 */ |
| extern int (*sym_bpf_create_map)(enum bpf_map_type, int key_size, int value_size, int max_entries, __u32 map_flags); |
| extern bool (*sym_bpf_probe_prog_type)(enum bpf_prog_type, __u32); |
| |
| /* helpers to use the available variant behind new API */ |
| static inline int compat_bpf_map_create(enum bpf_map_type map_type, |
| const char *map_name, |
| __u32 key_size, |
| __u32 value_size, |
| __u32 max_entries, |
| const struct bpf_map_create_opts *opts) { |
| if (sym_bpf_map_create) |
| return sym_bpf_map_create(map_type, map_name, key_size, |
| value_size, max_entries, opts); |
| |
| return sym_bpf_create_map(map_type, key_size, value_size, max_entries, |
| 0 /* opts->map_flags, but opts is always NULL for us so skip build dependency on the type */); |
| } |
| |
| static inline int compat_libbpf_probe_bpf_prog_type(enum bpf_prog_type prog_type, const void *opts) { |
| if (sym_libbpf_probe_bpf_prog_type) |
| return sym_libbpf_probe_bpf_prog_type(prog_type, opts); |
| |
| return sym_bpf_probe_prog_type(prog_type, 0); |
| } |