From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
David Miller <davem@davemloft.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH bpf-next v4 1/6] libbpf: Unpin auto-pinned maps if loading fails
Date: Sat, 09 Nov 2019 21:37:27 +0100 [thread overview]
Message-ID: <157333184731.88376.9992935027056165873.stgit@toke.dk> (raw)
In-Reply-To: <157333184619.88376.13377736576285554047.stgit@toke.dk>
From: Toke Høiland-Jørgensen <toke@redhat.com>
Since the automatic map-pinning happens during load, it will leave pinned
maps around if the load fails at a later stage. Fix this by unpinning any
pinned maps on cleanup. To avoid unpinning pinned maps that were reused
rather than newly pinned, add a new boolean property on struct bpf_map to
keep track of whether that map was reused or not; and only unpin those maps
that were not reused.
Fixes: 57a00f41644f ("libbpf: Add auto-pinning of maps when loading BPF objects")
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
tools/lib/bpf/libbpf.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index be4af95d5a2c..a70ade546a73 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -229,6 +229,7 @@ struct bpf_map {
enum libbpf_map_type libbpf_type;
char *pin_path;
bool pinned;
+ bool reused;
};
struct bpf_secdata {
@@ -1995,6 +1996,7 @@ int bpf_map__reuse_fd(struct bpf_map *map, int fd)
map->def.map_flags = info.map_flags;
map->btf_key_type_id = info.btf_key_type_id;
map->btf_value_type_id = info.btf_value_type_id;
+ map->reused = true;
return 0;
@@ -4026,7 +4028,7 @@ int bpf_object__unload(struct bpf_object *obj)
int bpf_object__load_xattr(struct bpf_object_load_attr *attr)
{
struct bpf_object *obj;
- int err;
+ int err, i;
if (!attr)
return -EINVAL;
@@ -4047,6 +4049,11 @@ int bpf_object__load_xattr(struct bpf_object_load_attr *attr)
return 0;
out:
+ /* unpin any maps that were auto-pinned during load */
+ for (i = 0; i < obj->nr_maps; i++)
+ if (obj->maps[i].pinned && !obj->maps[i].reused)
+ bpf_map__unpin(&obj->maps[i], NULL);
+
bpf_object__unload(obj);
pr_warn("failed to load object '%s'\n", obj->path);
return err;
next prev parent reply other threads:[~2019-11-09 20:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-09 20:37 [PATCH bpf-next v4 0/6] libbpf: Fix pinning and error message bugs and add new getters Toke Høiland-Jørgensen
2019-11-09 20:37 ` Toke Høiland-Jørgensen [this message]
2019-11-09 20:37 ` [PATCH bpf-next v4 2/6] selftests/bpf: Add tests for automatic map unpinning on load failure Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 3/6] libbpf: Propagate EPERM to caller on program load Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 4/6] libbpf: Use pr_warn() when printing netlink errors Toke Høiland-Jørgensen
2019-11-09 20:37 ` [PATCH bpf-next v4 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information Toke Høiland-Jørgensen
2019-11-10 6:32 ` Andrii Nakryiko
2019-11-09 20:37 ` [PATCH bpf-next v4 6/6] libbpf: Add getter for program size Toke Høiland-Jørgensen
2019-11-11 3:29 ` [PATCH bpf-next v4 0/6] libbpf: Fix pinning and error message bugs and add new getters Alexei Starovoitov
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