This is a note to let you know that I've just added the patch titled
libbpf: Apply map_set_def_max_entries() for inner_maps on creation
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libbpf-apply-map_set_def_max_entries-for-inner_maps-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7af28eea8e6e3091d5d4cf4ae98ef4d0a57f5b8f
Author: Andrey Grafin <conquistador@xxxxxxxxxxxxxx>
Date: Wed Jan 17 16:06:18 2024 +0300
libbpf: Apply map_set_def_max_entries() for inner_maps on creation
[ Upstream commit f04deb90e516e8e48bf8693397529bc942a9e80b ]
This patch allows to auto create BPF_MAP_TYPE_ARRAY_OF_MAPS and
BPF_MAP_TYPE_HASH_OF_MAPS with values of BPF_MAP_TYPE_PERF_EVENT_ARRAY
by bpf_object__load().
Previous behaviour created a zero filled btf_map_def for inner maps and
tried to use it for a map creation but the linux kernel forbids to create
a BPF_MAP_TYPE_PERF_EVENT_ARRAY map with max_entries=0.
Fixes: 646f02ffdd49 ("libbpf: Add BTF-defined map-in-map support")
Signed-off-by: Andrey Grafin <conquistador@xxxxxxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Yonghong Song <yonghong.song@xxxxxxxxx>
Acked-by: Hou Tao <houtao1@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240117130619.9403-1-conquistador@xxxxxxxxxxxxxx
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 0c201f07d8aef..e45f831a12c2b 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -71,6 +71,7 @@
static struct bpf_map *bpf_object__add_map(struct bpf_object *obj);
static bool prog_is_subprog(const struct bpf_object *obj, const struct bpf_program *prog);
+static int map_set_def_max_entries(struct bpf_map *map);
static int __base_pr(enum libbpf_print_level level, const char *format,
va_list args)
@@ -4617,6 +4618,9 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b
if (bpf_map_type__is_map_in_map(def->type)) {
if (map->inner_map) {
+ err = map_set_def_max_entries(map->inner_map);
+ if (err)
+ return err;
err = bpf_object__create_map(obj, map->inner_map, true);
if (err) {
pr_warn("map '%s': failed to create inner map: %d\n",
