From 25a2d944df35c6641b5fd4a316ca7bcbe1341bd9 Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Wed, 22 May 2013 18:32:27 +0200
Subject: [PATCH] virNetDevTapCreate: Fail on systems not supporting
 IFF_MULTI_QUEUE

In my previous patches I enabled the IFF_MULTI_QUEUE flag every
time the user requested multiqueue TAP device. However, this
works only at runtime. During build time the flag may be
undeclared.
---
 src/util/virnetdevtap.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/util/virnetdevtap.c b/src/util/virnetdevtap.c
index aa41b9c85f..e8057f7231 100644
--- a/src/util/virnetdevtap.c
+++ b/src/util/virnetdevtap.c
@@ -178,8 +178,15 @@ int virNetDevTapCreate(char **ifname,
 
         ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
         /* If tapfdSize is greater than one, request multiqueue */
-        if (tapfdSize > 1)
+        if (tapfdSize > 1) {
+# ifdef IFF_MULTI_QUEUE
             ifr.ifr_flags |= IFF_MULTI_QUEUE;
+# else
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("Multiqueue devices are not supported on this system"));
+            goto cleanup;
+# endif
+        }
 
 # ifdef IFF_VNET_HDR
         if ((flags &  VIR_NETDEV_TAP_CREATE_VNET_HDR) &&
-- 
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