netdev - [PATCH bpf-next] libbpf: export bpf_object__reuse

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Date:   Tue, 29 Sep 2020 11:18:45 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH bpf-next] libbpf: export bpf_object__reuse_map() to libbpf api

Besides bpf_map__reuse_fd(), which could let us reuse existing map fd.
bpf_object__reuse_map() could let us reuse existing pinned maps, which
is helpful.

This functions could also be used when we add iproute2 libbpf support,
so we don't need to re-use or re-implement new functions like
bpf_obj_get()/bpf_map_selfcheck_pinned() in iproute2.

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 tools/lib/bpf/libbpf.c | 3 +--
 tools/lib/bpf/libbpf.h | 1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 32dc444224d8..e835d7a3437f 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4033,8 +4033,7 @@ static bool map_is_reuse_compat(const struct bpf_map *map, int map_fd)
 		map_info.map_flags == map->def.map_flags);
 }
 
-static int
-bpf_object__reuse_map(struct bpf_map *map)
+int bpf_object__reuse_map(struct bpf_map *map)
 {
 	char *cp, errmsg[STRERR_BUFSIZE];
 	int err, pin_fd;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index a750f67a23f6..4b9e615eb393 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -431,6 +431,7 @@ bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
 /* get/set map FD */
 LIBBPF_API int bpf_map__fd(const struct bpf_map *map);
 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
+LIBBPF_API int bpf_object__reuse_map(struct bpf_map *map);
 /* get map definition */
 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
 /* get map name */
-- 
2.25.4