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tools lib bpf: Add bpf_map__pin()

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Add a new API to pin a BPF map to the filesystem. The user can specify
the path full path within a BPF filesystem to pin the map.

Signed-off-by: Joe Stringer <joe@ovn.org>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20170126212001.14103-3-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Joe Stringer 2017-01-26 13:19:57 -08:00 committed by Arnaldo Carvalho de Melo
parent f367540c8c
commit b6989f35e8
2 changed files with 23 additions and 0 deletions
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22
tools/lib/bpf/libbpf.c
View File

@ -1357,6 +1357,28 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
return 0;
}
int bpf_map__pin(struct bpf_map *map, const char *path)
{
int err;
err = check_path(path);
if (err)
return err;
if (map == NULL) {
pr_warning("invalid map pointer\n");
return -EINVAL;
}
if (bpf_obj_pin(map->fd, path)) {
pr_warning("failed to pin map: %s\n", strerror(errno));
return -errno;
}
pr_debug("pinned map '%s'\n", path);
return 0;
}
void bpf_object__close(struct bpf_object *obj)
{
size_t i;

1
tools/lib/bpf/libbpf.h
View File

@ -236,6 +236,7 @@ typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
int bpf_map__set_priv(struct bpf_map *map, void *priv,
bpf_map_clear_priv_t clear_priv);
void *bpf_map__priv(struct bpf_map *map);
int bpf_map__pin(struct bpf_map *map, const char *path);
long libbpf_get_error(const void *ptr);