From: Florin Coras <fcoras@cisco.com>
Date: Tue, 7 Oct 2025 06:48:19 +0000 (-0700)
Subject: vcl: handle incomplete dgram read
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F50%2F43850%2F2;p=vpp.git

vcl: handle incomplete dgram read

Type: improvement

Change-Id: I06e2c61376630e9c969986fa31cc6a17798b8614
Signed-off-by: Florin Coras <fcoras@cisco.com>
---

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 63646939940..75af90c43df 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -2154,7 +2154,16 @@ vppcom_session_read_internal (uint32_t session_handle, void *buf, int n,
 read_again:
 
   if (s->is_dgram)
-    rv = app_recv_dgram_raw (rx_fifo, buf, n, &s->transport, 0, peek);
+    {
+      rv = app_recv_dgram_raw (rx_fifo, buf, n, &s->transport, 0, peek);
+      /* Incomplete dgram. Probably due to how transport handled the enq */
+      if (PREDICT_FALSE (!rv))
+	{
+	  if (is_nonblocking)
+	    return VPPCOM_EWOULDBLOCK;
+	  goto read_again;
+	}
+    }
   else
     rv = app_recv_stream_raw (rx_fifo, buf, n, 0, peek);