vcl: allow more rx events on peekHEADmaster

If peek touches all data in the fifo, unset fifo event to request new
events when more data is enqueued.

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I878fa017f18ada5cef557600673bba920f230542

1 files changed, 10 insertions, 1 deletions

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 58f6ac0a134..a557093e897 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -2087,7 +2087,16 @@ read_again:
   ASSERT (rv >= 0);
 
   if (peek)
-    return rv;
+    {
+      /* Request new notifications if more data enqueued */
+      if (rv < n || rv == svm_fifo_max_dequeue_cons (rx_fifo))
+	{
+	  if (is_ct)
+	    svm_fifo_unset_event (s->rx_fifo);
+	  svm_fifo_unset_event (rx_fifo);
+	}
+      return rv;
+    }
 
   n_read += rv;