+/* Upper bound on the length of a nlattr-formatted flow key. The longest
+ * nlattr-formatted flow key would be:
+ *
+ * struct pad nl hdr total
+ * ------ --- ------ -----
+ * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
+ * OVS_KEY_ATTR_TUNNEL 0 -- 4 4
+ * - OVS_TUNNEL_KEY_ATTR_ID 8 -- 4 12
+ * - OVS_TUNNEL_KEY_ATTR_IPV4_SRC 4 -- 4 8
+ * - OVS_TUNNEL_KEY_ATTR_IPV4_DST 4 -- 4 8
+ * - OVS_TUNNEL_KEY_ATTR_TOS 1 3 4 8
+ * - OVS_TUNNEL_KEY_ATTR_TTL 1 3 4 8
+ * - OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT 0 -- 4 4
+ * - OVS_TUNNEL_KEY_ATTR_CSUM 0 -- 4 4
+ * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
+ * OVS_KEY_ATTR_SKB_MARK 4 -- 4 8
+ * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
+ * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
+ * OVS_KEY_ATTR_8021Q 4 -- 4 8
+ * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
+ * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
+ * OVS_KEY_ATTR_IPV6 40 -- 4 44
+ * OVS_KEY_ATTR_ICMPV6 2 2 4 8
+ * OVS_KEY_ATTR_ND 28 -- 4 32
+ * ----------------------------------------------------------
+ * total 208
+ */
+#define FLOW_BUFSIZE 208
+
+int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
+int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
+ const struct nlattr *);
+int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len,
+ const struct nlattr *attr);
+
+#define MAX_ACTIONS_BUFSIZE (32 * 1024)
+#define TBL_MIN_BUCKETS 1024
+
+struct flow_table {
+ struct flex_array *buckets;
+ unsigned int count, n_buckets;
+ struct rcu_head rcu;
+ int node_ver;
+ u32 hash_seed;
+ bool keep_flows;
+};
+
+static inline int ovs_flow_tbl_count(struct flow_table *table)
+{
+ return table->count;
+}