From: Florin Coras <fcoras@cisco.com>
Date: Thu, 3 Sep 2020 03:52:58 +0000 (-0700)
Subject: vcl: handle svm fifo write failure
X-Git-Tag: v21.01-rc0~36
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=56230097e2a642740a1a00483e54419edc7fc2ba;p=vpp.git

vcl: handle svm fifo write failure

Type: fix

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I4b132cad8ff906ef24846cc43935ccfd6aa7b4ec
---

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 71578b076d2..9174e5d6d2f 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -2172,7 +2172,9 @@ vppcom_session_write_inline (vcl_worker_t * wrk, vcl_session_t * s, void *buf,
     app_send_io_evt_to_vpp (s->vpp_evt_q, s->tx_fifo->master_session_index,
 			    et, SVM_Q_WAIT);
 
-  ASSERT (n_write > 0);
+  /* The underlying fifo segment can run out of memory */
+  if (PREDICT_FALSE (n_write < 0))
+    return VPPCOM_EAGAIN;
 
   VDBG (2, "session %u [0x%llx]: wrote %d bytes", s->session_index,
 	s->vpp_handle, n_write);