util: replace virHostdevNetConfigReplace with ...(Save|Set)NetConfig()

These two operations will need to be separated so that saving of the
original config is done before detaching the host net driver, and
setting the new config is done after attaching vfio-pci. This patch
splits the single function into two, but for now calls them together
(to make bisecting easier if there is a regression).

src/util/virhostdev.c

@@ -412,17 +412,30 @@ virHostdevNetConfigVirtPortProfile(const char *linkdev, int vf,
 }
 
 
+/**
+ * virHostdevSaveNetConfig:
+ * @hostdev: config object describing a hostdev device
+ * @stateDir: directory to save device state into
+ *
+ * If the given hostdev device is an SRIOV network VF and *does not*
+ * have a <virtualport> element (ie, it isn't being configured via
+ * 802.11Qbh), determine its PF+VF#, and use that to save its current
+ * "admin" MAC address and VF tag (the ones saved in the PF
+ * driver).
+ *
+ * Returns 0 on success, -1 on failure.
+ */
 static int
-virHostdevNetConfigReplace(virDomainHostdevDefPtr hostdev,
-                           const unsigned char *uuid,
+virHostdevSaveNetConfig(virDomainHostdevDefPtr hostdev,
                         const char *stateDir)
 {
-    char *linkdev = NULL;
-    virNetDevVlanPtr vlan;
-    virNetDevVPortProfilePtr virtPort;
     int ret = -1;
+    char *linkdev = NULL;
     int vf = -1;
-    bool port_profile_associate = true;
+
+    if (!virHostdevIsPCINetDevice(hostdev) ||
+        virDomainNetGetActualVirtPortProfile(hostdev->parent.data.net))
+       return 0;
 
     if (virHostdevIsVirtualFunction(hostdev) != 1) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -431,6 +444,44 @@ virHostdevNetConfigReplace(virDomainHostdevDefPtr hostdev,
         goto cleanup;
     }
 
+    if (virHostdevNetDevice(hostdev, &linkdev, &vf) < 0)
+        goto cleanup;
+
+    if (virNetDevSaveNetConfig(linkdev, vf, stateDir, true) < 0)
+        goto cleanup;
+
+    ret = 0;
+ cleanup:
+    VIR_FREE(linkdev);
+    return ret;
+}
+
+
+/**
+ * virHostdevSetNetConfig:
+ * @hostdev: config object describing a hostdev device
+ * @uuid: uuid of the domain
+ *
+ * If the given hostdev device is an SRIOV network VF, determine its
+ * PF+VF#, and use that to set the "admin" MAC address and VF tag (the
+ * ones saved in the PF driver).xs
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+static int
+virHostdevSetNetConfig(virDomainHostdevDefPtr hostdev,
+                       const unsigned char *uuid)
+{
+    char *linkdev = NULL;
+    virNetDevVlanPtr vlan;
+    virNetDevVPortProfilePtr virtPort;
+    int ret = -1;
+    int vf = -1;
+    bool port_profile_associate = true;
+
+    if (!virHostdevIsPCINetDevice(hostdev))
+        return 0;
+
     if (virHostdevNetDevice(hostdev, &linkdev, &vf) < 0)
         goto cleanup;
 
@@ -450,11 +501,6 @@ virHostdevNetConfigReplace(virDomainHostdevDefPtr hostdev,
             goto cleanup;
         }
     } else {
-        /* Save/Set only mac and vlan */
-
-        if (virNetDevSaveNetConfig(linkdev, vf, stateDir, true) < 0)
-            goto cleanup;
-
         if (virNetDevSetNetConfig(linkdev, vf, &hostdev->parent.data.net->mac,
                                   vlan, NULL, true) < 0) {
             goto cleanup;
@@ -467,6 +513,7 @@ virHostdevNetConfigReplace(virDomainHostdevDefPtr hostdev,
     return ret;
 }
 
+
 /* @oldStateDir:
  * For upgrade purpose:
  * To an existing VM on QEMU, the hostdev netconfig file is originally stored
@@ -693,15 +740,15 @@ virHostdevPreparePCIDevices(virHostdevManagerPtr mgr,
     }
 
     /* Step 4: For SRIOV network devices, Now that we have detached the
-     * the network device, set the netdev config */
+     * the network device, set the new netdev config */
     for (i = 0; i < nhostdevs; i++) {
-         virDomainHostdevDefPtr hostdev = hostdevs[i];
-         if (!virHostdevIsPCINetDevice(hostdev))
-             continue;
-         if (virHostdevNetConfigReplace(hostdev, uuid,
-                                        mgr->stateDir) < 0) {
+
+        if (virHostdevSaveNetConfig(hostdevs[i], mgr->stateDir) < 0)
             goto resetvfnetconfig;
-         }
+
+        if (virHostdevSetNetConfig(hostdevs[i], uuid) < 0)
+            goto resetvfnetconfig;
+
         last_processed_hostdev_vf = i;
     }