int (*flow_dump_next)(const struct dpif *dpif, void *state,
const struct nlattr **key, size_t *key_len,
const struct nlattr **actions, size_t *actions_len,
int (*flow_dump_next)(const struct dpif *dpif, void *state,
const struct nlattr **key, size_t *key_len,
const struct nlattr **actions, size_t *actions_len,