X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvcl%2Fvcl_private.c;h=300b82c4f21117b3691fc0175be44668b8e90614;hb=7a2abce4c9fc2191b3d3989c84516391036b6882;hp=14582ce025d5d9511dcf8b60282e78e3df331e47;hpb=57660d9df62756c5db1516be0dbb48505f996e82;p=vpp.git

diff --git a/src/vcl/vcl_private.c b/src/vcl/vcl_private.c
index 14582ce025d..300b82c4f21 100644
--- a/src/vcl/vcl_private.c
+++ b/src/vcl/vcl_private.c
@@ -390,6 +390,15 @@ vcl_session_write_ready (vcl_session_t * session)
   if (vcl_session_is_ct (session))
     return svm_fifo_max_enqueue_prod (session->ct_tx_fifo);
 
+  if (session->is_dgram)
+    {
+      u32 max_enq = svm_fifo_max_enqueue_prod (session->tx_fifo);
+
+      if (max_enq <= sizeof (session_dgram_hdr_t))
+	return 0;
+      return max_enq - sizeof (session_dgram_hdr_t);
+    }
+
   return svm_fifo_max_enqueue_prod (session->tx_fifo);
 }