Move error reporting into virDomainNetFindIdx

Every caller checked the return value and logged an error
- one if no device with the specified MAC was found,
other if there were multiple devices matching the MAC address
(except for qemuDomainUpdateDeviceConfig which logged the same
 message in both cases).

Move the error reporting into virDomainNetFindIdx, since in both cases,
we couldn't find one single match - it's just the error messages that
differ.

src/conf/domain_conf.c

@@ -10236,14 +10236,14 @@ int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net)
  *                      PCI address (if specified)
  *
  * Return: index of match if unique match found
- *         -1 if not found
- *         -2 if multiple matches
+ *         -1 otherwise and an error is logged
  */
 int
 virDomainNetFindIdx(virDomainDefPtr def, virDomainNetDefPtr net)
 {
     size_t i;
     int matchidx = -1;
+    char mac[VIR_MAC_STRING_BUFLEN];
     bool PCIAddrSpecified = virDomainDeviceAddressIsValid(&net->info,
                                                           VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI);
 
@@ -10258,8 +10258,10 @@ virDomainNetFindIdx(virDomainDefPtr def, virDomainNetDefPtr net)
              * specify only vendor and product ID, and there may be
              * multiples of those.
              */
-            matchidx = -2; /* indicates "multiple matches" to caller */
-            break;
+            virReportError(VIR_ERR_OPERATION_FAILED,
+                           _("multiple devices matching mac address %s found"),
+                           virMacAddrFormat(&net->mac, mac));
+            return -1;
         }
         if (PCIAddrSpecified) {
             if (virDevicePCIAddressEqual(&def->nets[i]->info.addr.pci,
@@ -10275,6 +10277,11 @@ virDomainNetFindIdx(virDomainDefPtr def, virDomainNetDefPtr net)
             matchidx = i;
         }
     }
+    if (matchidx < 0) {
+        virReportError(VIR_ERR_OPERATION_FAILED,
+                       _("no device matching mac address %s found"),
+                       virMacAddrFormat(&net->mac, mac));
+    }
     return matchidx;
 }
 

src/lxc/lxc_driver.c

@@ -3768,22 +3768,12 @@ lxcDomainUpdateDeviceConfig(virDomainDefPtr vmdef,
     int ret = -1;
     virDomainNetDefPtr net;
     int idx;
-    char mac[VIR_MAC_STRING_BUFLEN];
 
     switch (dev->type) {
     case VIR_DOMAIN_DEVICE_NET:
         net = dev->data.net;
-        idx = virDomainNetFindIdx(vmdef, net);
-        if (idx == -2) {
-            virReportError(VIR_ERR_OPERATION_FAILED,
-                           _("multiple devices matching mac address %s found"),
-                           virMacAddrFormat(&net->mac, mac));
-            goto cleanup;
-        } else if (idx < 0) {
-            virReportError(VIR_ERR_OPERATION_FAILED, "%s",
-                           _("no matching network device was found"));
+        if ((idx = virDomainNetFindIdx(vmdef, net)) < 0)
             goto cleanup;
-        }
 
         virDomainNetDefFree(vmdef->nets[idx]);
 
@@ -3813,7 +3803,6 @@ lxcDomainDetachDeviceConfig(virDomainDefPtr vmdef,
     virDomainNetDefPtr net;
     virDomainHostdevDefPtr hostdev, det_hostdev;
     int idx;
-    char mac[VIR_MAC_STRING_BUFLEN];
 
     switch (dev->type) {
     case VIR_DOMAIN_DEVICE_DISK:
@@ -3829,17 +3818,9 @@ lxcDomainDetachDeviceConfig(virDomainDefPtr vmdef,
 
     case VIR_DOMAIN_DEVICE_NET:
         net = dev->data.net;
-        idx = virDomainNetFindIdx(vmdef, net);
-        if (idx == -2) {
-            virReportError(VIR_ERR_OPERATION_FAILED,
-                           _("multiple devices matching mac address %s found"),
-                           virMacAddrFormat(&net->mac, mac));
-            goto cleanup;
-        } else if (idx < 0) {
-            virReportError(VIR_ERR_OPERATION_FAILED, "%s",
-                           _("no matching network device was found"));
+        if ((idx = virDomainNetFindIdx(vmdef, net)) < 0)
             goto cleanup;
-        }
+
         /* this is guaranteed to succeed */
         virDomainNetDefFree(virDomainNetRemove(vmdef, idx));
         ret = 0;
@@ -4650,21 +4631,11 @@ lxcDomainDetachDeviceNetLive(virDomainObjPtr vm,
 {
     int detachidx, ret = -1;
     virDomainNetDefPtr detach = NULL;
-    char mac[VIR_MAC_STRING_BUFLEN];
     virNetDevVPortProfilePtr vport = NULL;
 
-    detachidx = virDomainNetFindIdx(vm->def, dev->data.net);
-    if (detachidx == -2) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("multiple devices matching mac address %s found"),
-                       virMacAddrFormat(&dev->data.net->mac, mac));
-        goto cleanup;
-    } else if (detachidx < 0) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("network device %s not found"),
-                       virMacAddrFormat(&dev->data.net->mac, mac));
+    if ((detachidx = virDomainNetFindIdx(vm->def, dev->data.net)) < 0)
         goto cleanup;
-    }
+
     detach = vm->def->nets[detachidx];
 
     switch (virDomainNetGetActualType(detach)) {

src/qemu/qemu_driver.c

@@ -6763,7 +6763,6 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
     virDomainChrDefPtr chr;
     virDomainFSDefPtr fs;
     int idx;
-    char mac[VIR_MAC_STRING_BUFLEN];
 
     switch (dev->type) {
     case VIR_DOMAIN_DEVICE_DISK:
@@ -6778,17 +6777,9 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
 
     case VIR_DOMAIN_DEVICE_NET:
         net = dev->data.net;
-        idx = virDomainNetFindIdx(vmdef, net);
-        if (idx == -2) {
-            virReportError(VIR_ERR_OPERATION_FAILED,
-                           _("multiple devices matching mac address %s found"),
-                           virMacAddrFormat(&net->mac, mac));
+        if ((idx = virDomainNetFindIdx(vmdef, net)) < 0)
             return -1;
-        } else if (idx < 0) {
-            virReportError(VIR_ERR_OPERATION_FAILED, "%s",
-                           _("no matching network device was found"));
-            return -1;
-        }
+
         /* this is guaranteed to succeed */
         virDomainNetDefFree(virDomainNetRemove(vmdef, idx));
         break;
@@ -6868,7 +6859,6 @@ qemuDomainUpdateDeviceConfig(virQEMUCapsPtr qemuCaps,
     virDomainDiskDefPtr orig, disk;
     virDomainNetDefPtr net;
     int pos;
-    char mac[VIR_MAC_STRING_BUFLEN];
 
 
     switch (dev->type) {
@@ -6907,20 +6897,8 @@ qemuDomainUpdateDeviceConfig(virQEMUCapsPtr qemuCaps,
 
     case VIR_DOMAIN_DEVICE_NET:
         net = dev->data.net;
-        pos = virDomainNetFindIdx(vmdef, net);
-        if (pos == -2) {
-            virMacAddrFormat(&net->mac, mac);
-            virReportError(VIR_ERR_OPERATION_FAILED,
-                           _("couldn't find matching device "
-                             "with mac address %s"), mac);
-            return -1;
-        } else if (pos < 0) {
-            virMacAddrFormat(&net->mac, mac);
-            virReportError(VIR_ERR_OPERATION_FAILED,
-                           _("couldn't find matching device "
-                             "with mac address %s"), mac);
+        if ((pos = virDomainNetFindIdx(vmdef, net)) < 0)
             return -1;
-        }
 
         virDomainNetDefFree(vmdef->nets[pos]);
 

src/qemu/qemu_hotplug.c

@@ -3362,21 +3362,10 @@ qemuDomainDetachNetDevice(virQEMUDriverPtr driver,
     qemuDomainObjPrivatePtr priv = vm->privateData;
     int vlan;
     char *hostnet_name = NULL;
-    char mac[VIR_MAC_STRING_BUFLEN];
 
-    detachidx = virDomainNetFindIdx(vm->def, dev->data.net);
-    if (detachidx == -2) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("multiple devices matching mac address %s found"),
-                       virMacAddrFormat(&dev->data.net->mac, mac));
-        goto cleanup;
-    }
-    else if (detachidx < 0) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("network device %s not found"),
-                       virMacAddrFormat(&dev->data.net->mac, mac));
+    if ((detachidx = virDomainNetFindIdx(vm->def, dev->data.net)) < 0)
         goto cleanup;
-    }
+
     detach = vm->def->nets[detachidx];
 
     if (virDomainNetGetActualType(detach) == VIR_DOMAIN_NET_TYPE_HOSTDEV) {