bpf: add helper for copying attrs to struct bpf_map

All map types reimplement the field-by-field copy of union bpf_attr
members into struct bpf_map.  Add a helper to perform this operation.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 1 insertions, 7 deletions

diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index ebdef54bf7df..565f9ece9115 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -93,13 +93,7 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
         if (!dtab)
                 return ERR_PTR(-ENOMEM);
 
-        /* mandatory map attributes */
-        dtab->map.map_type = attr->map_type;
-        dtab->map.key_size = attr->key_size;
-        dtab->map.value_size = attr->value_size;
-        dtab->map.max_entries = attr->max_entries;
-        dtab->map.map_flags = attr->map_flags;
-        dtab->map.numa_node = bpf_map_attr_numa_node(attr);
+        bpf_map_init_from_attr(&dtab->map, attr);
 
         /* make sure page count doesn't overflow */
         cost = (u64) dtab->map.max_entries * sizeof(struct bpf_dtab_netdev *);