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bpf: add a new API libbpf_num_possible_cpus()

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Adding a new API libbpf_num_possible_cpus() that helps user with
per-CPU map operations.

Signed-off-by: Hechao Li <hechaol@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Hechao Li 2019-06-10 17:56:50 -07:00 • committed by Daniel Borkmann
parent 89cceaa939
commit 6446b31555
3 changed files with 74 additions and 0 deletions
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16
tools/lib/bpf/libbpf.h
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@ -454,6 +454,22 @@ bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
LIBBPF_API void
bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
/*
* A helper function to get the number of possible CPUs before looking up
* per-CPU maps. Negative errno is returned on failure.
*
* Example usage:
*
* int ncpus = libbpf_num_possible_cpus();
* if (ncpus < 0) {
* // error handling
* }
* long values[ncpus];
* bpf_map_lookup_elem(per_cpu_map_fd, key, values);
*
*/
LIBBPF_API int libbpf_num_possible_cpus(void);
#ifdef __cplusplus
} /* extern "C" */
#endif