int dpif_flow_del(struct dpif *,
const struct nlattr *key, size_t key_len,
struct dpif_flow_stats *);
int dpif_flow_del(struct dpif *,
const struct nlattr *key, size_t key_len,
struct dpif_flow_stats *);
const struct nlattr *key, size_t key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *);
const struct nlattr *key, size_t key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *);