1 files changed, 36 insertions, 3 deletions

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 0394f1f9213b..bd169a7bcc93 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -72,14 +72,15 @@ struct bpf_map {
 	u32 value_size;
 	u32 max_entries;
 	u32 map_flags;
-	u32 pages;
+	int spin_lock_off; /* >=0 valid offset, <0 error */
 	u32 id;
 	int numa_node;
 	u32 btf_key_type_id;
 	u32 btf_value_type_id;
 	struct btf *btf;
+	u32 pages;
 	bool unpriv_array;
-	/* 55 bytes hole */
+	/* 51 bytes hole */
 
 	/* The 3rd and 4th cacheline with misc members to avoid false sharing
 	 * particularly with refcounting.
@@ -91,6 +92,36 @@ struct bpf_map {
 	char name[BPF_OBJ_NAME_LEN];
 };
 
+static inline bool map_value_has_spin_lock(const struct bpf_map *map)
+{
+	return map->spin_lock_off >= 0;
+}
+
+static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
+{
+	if (likely(!map_value_has_spin_lock(map)))
+		return;
+	*(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
+		(struct bpf_spin_lock){};
+}
+
+/* copy everything but bpf_spin_lock */
+static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
+{
+	if (unlikely(map_value_has_spin_lock(map))) {
+		u32 off = map->spin_lock_off;
+
+		memcpy(dst, src, off);
+		memcpy(dst + off + sizeof(struct bpf_spin_lock),
+		       src + off + sizeof(struct bpf_spin_lock),
+		       map->value_size - off - sizeof(struct bpf_spin_lock));
+	} else {
+		memcpy(dst, src, map->value_size);
+	}
+}
+void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
+			   bool lock_src);
+
 struct bpf_offload_dev;
 struct bpf_offloaded_map;
 
@@ -162,6 +193,7 @@ enum bpf_arg_type {
 	ARG_PTR_TO_CTX,		/* pointer to context */
 	ARG_ANYTHING,		/* any (initialized) argument is ok */
 	ARG_PTR_TO_SOCKET,	/* pointer to bpf_sock */
+	ARG_PTR_TO_SPIN_LOCK,	/* pointer to bpf_spin_lock */
 };
 
 /* type of values returned from helper functions */
@@ -879,7 +911,8 @@ extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
-
+extern const struct bpf_func_proto bpf_spin_lock_proto;
+extern const struct bpf_func_proto bpf_spin_unlock_proto;
 extern const struct bpf_func_proto bpf_get_local_storage_proto;
 
 /* Shared helpers among cBPF and eBPF. */