[libvirt] [PATCH v2 10/12] qemu: Change qemuOpenVhostNet return value

[Michal Privoznik]

Currently, need for use of vhost-net is signalized by returning
zero, and setting passed FD to a value different to negative one.
However, when using multiple vhost-net devices, it is not so easy
so we should use return value for that.
---
 src/qemu/qemu_command.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3193c0f..d466725 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -412,6 +412,19 @@ cleanup:
 }
 
 
+/**
+ * qemuOpenVhostNet:
+ * @def: domain definition
+ * @net: network definition
+ * @qemuCaps: qemu binary capabilities
+ * @vhostfd: array of opened vhost-net device
+ * @vhostfdSize: size of @vhostfd array
+ *
+ * Open vhost-net, multiple times - if request.
+ * Returns: 1 if no vhost-net is required for @net type
+ *          0 on success
+ *         -1 on failure
+ */
 int
 qemuOpenVhostNet(virDomainDefPtr def,
                  virDomainNetDefPtr net,
@@ -425,9 +438,8 @@ qemuOpenVhostNet(virDomainDefPtr def,
         vhostfd[i] = -1;   /* assume we won't use vhost */
 
     /* If the config says explicitly to not use vhost, return now */
-    if (net->driver.virtio.name == VIR_DOMAIN_NET_BACKEND_TYPE_QEMU) {
-       return 0;
-    }
+    if (net->driver.virtio.name == VIR_DOMAIN_NET_BACKEND_TYPE_QEMU)
+       return 1;
 
     /* If qemu doesn't support vhost-net mode (including the -netdev command
      * option), don't try to open the device.
@@ -441,7 +453,7 @@ qemuOpenVhostNet(virDomainDefPtr def,
                                    "this QEMU binary"));
             return -1;
         }
-        return 0;
+        return 1;
     }
 
     /* If the nic model isn't virtio, don't try to open. */
@@ -452,7 +464,7 @@ qemuOpenVhostNet(virDomainDefPtr def,
                                    "virtio network interfaces"));
             return -1;
         }
-        return 0;
+        return 1;
     }
 
     for (i = 0; i < vhostfdSize; i++) {
-- 
1.8.2.1