bpf: offload: allow offloaded programs to use perf event arrays

BPF_MAP_TYPE_PERF_EVENT_ARRAY is special as far as offload goes.
The map only holds glue to perf ring, not actual data.  Allow
non-offloaded perf event arrays to be used in offloaded programs.
Offload driver can extract the events from HW and put them in
the map for user space to retrieve.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 0e00a13ff01b..321969da67b7 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -110,6 +110,11 @@ static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
 	return container_of(map, struct bpf_offloaded_map, map);
 }
 
+static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
+{
+	return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
+}
+
 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
 {
 	return map->ops->map_seq_show_elem && map->ops->map_check_btf;