From: Florin Coras <fcoras@cisco.com>
Date: Thu, 13 Aug 2020 01:58:25 +0000 (-0700)
Subject: vcl: minimize vpp to vcl rx events
X-Git-Tag: v21.01-rc0~112
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=c34118b5915bb2f4e55accaaf9045c05426104b4;p=vpp.git

vcl: minimize vpp to vcl rx events

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I2015162bd315927e45b9fe583324b1458fe69d8f
---

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 1622409c0f9..d52d9a995a0 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -1941,7 +1941,17 @@ vppcom_session_read_internal (uint32_t session_handle, void *buf, int n,
     n_read = app_recv_stream_raw (rx_fifo, buf, n, 0, peek);
 
   if (svm_fifo_is_empty_cons (rx_fifo))
-    svm_fifo_unset_event (s->rx_fifo);
+    {
+      svm_fifo_unset_event (s->rx_fifo);
+      if (!svm_fifo_is_empty_cons (rx_fifo)
+	  && svm_fifo_set_event (s->rx_fifo) && is_nonblocking)
+	{
+	  session_event_t *e;
+	  vec_add2 (wrk->unhandled_evts_vector, e, 1);
+	  e->event_type = SESSION_IO_EVT_RX;
+	  e->session_index = s->session_index;
+	}
+    }
 
   /* Cut-through sessions might request tx notifications on rx fifos */
   if (PREDICT_FALSE (rx_fifo->want_deq_ntf))