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Subject[PATCHv3 perf/core 2/6] tools lib bpf: Add bpf_map__pin()
Date
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>
---
v3: No change.
v2: Don't automount BPF filesystem
Split program, map, object pinning into separate APIs and separate
patches.
---
tools/lib/bpf/libbpf.c | 22 ++++++++++++++++++++++
tools/lib/bpf/libbpf.h | 1 +
2 files changed, 23 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d1d7638b7c21..ce987c02363e 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1349,6 +1349,28 @@ 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;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 9f8aa63b95f4..2addf9d5b13c 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -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);

--
2.11.0
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