+ mq = app_wrk->event_queue;
+
+ clib_spinlock_lock (&app_wrk->postponed_mq_msgs_lock);
+
+ max_msg = clib_min (32, clib_fifo_elts (app_wrk->postponed_mq_msgs));
+
+ while (n_msg < max_msg)
+ {
+ pm = clib_fifo_head (app_wrk->postponed_mq_msgs);
+ if (mq_try_lock_and_alloc_msg (mq, pm->ring, mq_msg))
+ break;
+
+ evt = svm_msg_q_msg_data (mq, mq_msg);
+ clib_memset (evt, 0, sizeof (*evt));
+ evt->event_type = pm->event_type;
+ clib_memcpy_fast (evt->data, pm->data, pm->len);
+
+ if (pm->fd != -1)
+ app_wrk_send_fd (app_wrk, pm->fd);
+
+ svm_msg_q_add_and_unlock (mq, mq_msg);
+
+ clib_fifo_advance_head (app_wrk->postponed_mq_msgs, 1);
+ n_msg += 1;
+ }
+
+ if (!clib_fifo_elts (app_wrk->postponed_mq_msgs))
+ {
+ app_wrk->mq_congested = 0;
+ }
+ else
+ {
+ session_send_rpc_evt_to_thread_force (
+ args.thread_index, app_wrk_handle_mq_postponed_msgs,
+ uword_to_pointer (args.as_uword, void *));
+ }
+
+ clib_spinlock_unlock (&app_wrk->postponed_mq_msgs_lock);
+
+ return 0;
+}
+
+static void
+app_wrk_add_mq_postponed_msg (app_worker_t *app_wrk, session_mq_rings_e ring,
+ u8 evt_type, void *msg, u32 msg_len, int fd)
+{
+ app_wrk_postponed_msg_t *pm;
+
+ clib_spinlock_lock (&app_wrk->postponed_mq_msgs_lock);
+
+ app_wrk->mq_congested = 1;
+
+ clib_fifo_add2 (app_wrk->postponed_mq_msgs, pm);
+ clib_memcpy_fast (pm->data, msg, msg_len);
+ pm->event_type = evt_type;
+ pm->ring = ring;
+ pm->len = msg_len;
+ pm->fd = fd;
+
+ if (clib_fifo_elts (app_wrk->postponed_mq_msgs) == 1)
+ {
+ app_wrk_mq_rpc_ags_t args = { .thread_index = vlib_get_thread_index (),
+ .app_wrk_index = app_wrk->wrk_index };
+
+ session_send_rpc_evt_to_thread_force (
+ args.thread_index, app_wrk_handle_mq_postponed_msgs,
+ uword_to_pointer (args.as_uword, void *));
+ }
+
+ clib_spinlock_unlock (&app_wrk->postponed_mq_msgs_lock);
+}
+
+always_inline void
+app_wrk_send_ctrl_evt_inline (app_worker_t *app_wrk, u8 evt_type, void *msg,
+ u32 msg_len, int fd)
+{
+ svm_msg_q_msg_t _mq_msg, *mq_msg = &_mq_msg;
+ svm_msg_q_t *mq = app_wrk->event_queue;
+ session_event_t *evt;
+ int rv;
+
+ if (PREDICT_FALSE (app_wrk->mq_congested))
+ goto handle_congestion;
+
+ rv = mq_try_lock_and_alloc_msg (mq, SESSION_MQ_CTRL_EVT_RING, mq_msg);
+ if (PREDICT_FALSE (rv))
+ goto handle_congestion;
+
+ evt = svm_msg_q_msg_data (mq, mq_msg);
+ clib_memset (evt, 0, sizeof (*evt));
+ evt->event_type = evt_type;
+ clib_memcpy_fast (evt->data, msg, msg_len);
+
+ if (fd != -1)
+ app_wrk_send_fd (app_wrk, fd);
+
+ svm_msg_q_add_and_unlock (mq, mq_msg);
+
+ return;
+
+handle_congestion:
+
+ app_wrk_add_mq_postponed_msg (app_wrk, SESSION_MQ_CTRL_EVT_RING, evt_type,
+ msg, msg_len, fd);
+}
+
+void
+app_wrk_send_ctrl_evt_fd (app_worker_t *app_wrk, u8 evt_type, void *msg,
+ u32 msg_len, int fd)
+{
+ app_wrk_send_ctrl_evt_inline (app_wrk, evt_type, msg, msg_len, fd);
+}
+
+void
+app_wrk_send_ctrl_evt (app_worker_t *app_wrk, u8 evt_type, void *msg,
+ u32 msg_len)
+{
+ app_wrk_send_ctrl_evt_inline (app_wrk, evt_type, msg, msg_len, -1);
+}
+
+static inline int
+app_send_io_evt_rx (app_worker_t * app_wrk, session_t * s)
+{
+ svm_msg_q_msg_t _mq_msg = { 0 }, *mq_msg = &_mq_msg;
+ session_event_t *evt;
+ svm_msg_q_t *mq;
+ u32 app_session;
+ int rv;
+