nodedev: Add ability to find a vport capable vHBA

If a <parent> is not supplied in the XML used to create a non-persistent
vHBA, then instead of failing, let's try to find a "vports" capable node
device and use that.

Signed-off-by: John Ferlan <jferlan@redhat.com>

src/conf/node_device_conf.c

@@ -75,14 +75,19 @@ virNodeDevCapsDefParseString(const char *xpath,
 int virNodeDeviceHasCap(const virNodeDeviceObj *dev, const char *cap)
 {
     virNodeDevCapsDefPtr caps = dev->def->caps;
+    const char *fc_host_cap =
+        virNodeDevCapTypeToString(VIR_NODE_DEV_CAP_FC_HOST);
+    const char *vports_cap =
+        virNodeDevCapTypeToString(VIR_NODE_DEV_CAP_VPORTS);
+
     while (caps) {
         if (STREQ(cap, virNodeDevCapTypeToString(caps->data.type)))
             return 1;
         else if (caps->data.type == VIR_NODE_DEV_CAP_SCSI_HOST)
-            if ((STREQ(cap, "fc_host") &&
+            if ((STREQ(cap, fc_host_cap) &&
                 (caps->data.scsi_host.flags &
                  VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST)) ||
-                (STREQ(cap, "vports") &&
+                (STREQ(cap, vports_cap) &&
                 (caps->data.scsi_host.flags &
                  VIR_NODE_DEV_CAP_FLAG_HBA_VPORT_OPS)))
                 return 1;
@@ -151,6 +156,23 @@ virNodeDeviceObjPtr virNodeDeviceFindByName(virNodeDeviceObjListPtr devs,
 }
 
 
+static virNodeDeviceObjPtr
+virNodeDeviceFindByCap(virNodeDeviceObjListPtr devs,
+                       const char *cap)
+{
+    size_t i;
+
+    for (i = 0; i < devs->count; i++) {
+        virNodeDeviceObjLock(devs->objs[i]);
+        if (virNodeDeviceHasCap(devs->objs[i], cap))
+            return devs->objs[i];
+        virNodeDeviceObjUnlock(devs->objs[i]);
+    }
+
+    return NULL;
+}
+
+
 void virNodeDeviceDefFree(virNodeDeviceDefPtr def)
 {
     virNodeDevCapsDefPtr caps;
@@ -1828,6 +1850,29 @@ virNodeDeviceGetParentHost(virNodeDeviceObjListPtr devs,
     return ret;
 }
 
+
+int
+virNodeDeviceFindVportParentHost(virNodeDeviceObjListPtr devs,
+                                 int *parent_host)
+{
+    virNodeDeviceObjPtr parent = NULL;
+    const char *cap = virNodeDevCapTypeToString(VIR_NODE_DEV_CAP_VPORTS);
+    int ret;
+
+    if (!(parent = virNodeDeviceFindByCap(devs, cap))) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("Could not find any vport capable device"));
+        return -1;
+    }
+
+    ret = virNodeDeviceFindFCParentHost(parent, parent_host);
+
+    virNodeDeviceObjUnlock(parent);
+
+    return ret;
+}
+
+
 void virNodeDevCapsDefFree(virNodeDevCapsDefPtr caps)
 {
     size_t i = 0;

src/conf/node_device_conf.h

@@ -273,6 +273,9 @@ int virNodeDeviceGetParentHost(virNodeDeviceObjListPtr devs,
                                const char *parent_name,
                                int *parent_host);
 
+int virNodeDeviceFindVportParentHost(virNodeDeviceObjListPtr devs,
+                                     int *parent_host);
+
 void virNodeDeviceDefFree(virNodeDeviceDefPtr def);
 
 void virNodeDeviceObjFree(virNodeDeviceObjPtr dev);

src/libvirt_private.syms

@@ -700,6 +700,7 @@ virNodeDeviceDefParseNode;
 virNodeDeviceDefParseString;
 virNodeDeviceFindByName;
 virNodeDeviceFindBySysfsPath;
+virNodeDeviceFindVportParentHost;
 virNodeDeviceGetParentHost;
 virNodeDeviceGetWWNs;
 virNodeDeviceHasCap;

src/node_device/node_device_driver.c

@@ -584,10 +584,15 @@ nodeDeviceCreateXML(virConnectPtr conn,
     if (virNodeDeviceGetWWNs(def, &wwnn, &wwpn) == -1)
         goto cleanup;
 
+    if (def->parent) {
         if (virNodeDeviceGetParentHost(&driver->devs,
                                        def->name,
                                        def->parent,
-                                   &parent_host) == -1) {
+                                       &parent_host) < 0)
+            goto cleanup;
+    } else {
+        /* Try to find a vport capable scsi_host when no parent supplied */
+        if (virNodeDeviceFindVportParentHost(&driver->devs, &parent_host) < 0)
             goto cleanup;
     }