From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: [PATCH 08/14] tools lib bpf: Add bpf_map__pin() Date: Wed, 1 Feb 2017 09:25:01 -0300 Message-ID: <20170201122507.29303-9-acme@kernel.org> References: <20170201122507.29303-1-acme@kernel.org> Cc: linux-kernel@vger.kernel.org, Joe Stringer , Alexei Starovoitov , Daniel Borkmann , Wang Nan , netdev@vger.kernel.org, Arnaldo Carvalho de Melo To: Ingo Molnar Return-path: In-Reply-To: <20170201122507.29303-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Joe Stringer 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 Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-3-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo --- 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 c4465b2fddf6..6a8c8beeb291 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -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; 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); -- 2.9.3