+typedef int (session_fifo_rx_fn) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ session_manager_worker_t * wrk,
+ session_event_t * e, int *n_tx_pkts);
+
+extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
+extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
+extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
+
+u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
+
+typedef struct session_manager_main_