conf: add <vlan> element to network and domain interface elements

The following config elements now support a <vlan> subelements:

within a domain: <interface>, and the <actual> subelement of <interface>
within a network: the toplevel, as well as any <portgroup>

Each vlan element must have one or more <tag id='n'/> subelements.  If
there is more than one tag, it is assumed that vlan trunking is being
requested. If trunking is required with only a single tag, the
attribute "trunk='yes'" should be added to the toplevel <vlan>
element.

Some examples:

  <interface type='hostdev'/>
    <vlan>
      <tag id='42'/>
    </vlan>
    <mac address='52:54:00:12:34:56'/>
    ...
  </interface>

  <network>
    <name>vlan-net</name>
    <vlan trunk='yes'>
      <tag id='30'/>
    </vlan>
    <virtualport type='openvswitch'/>
  </network>

  <interface type='network'/>
    <source network='vlan-net'/>
    ...
  </interface>

  <network>
    <name>trunk-vlan</name>
    <vlan>
      <tag id='42'/>
      <tag id='43'/>
    </vlan>
    ...
  </network>

  <network>
    <name>multi</name>
    ...
    <portgroup name='production'/>
      <vlan>
        <tag id='42'/>
      </vlan>
    </portgroup>
    <portgroup name='test'/>
      <vlan>
        <tag id='666'/>
      </vlan>
    </portgroup>
  </network>

  <interface type='network'/>
    <source network='multi' portgroup='test'/>
    ...
  </interface>

IMPORTANT NOTE: As of this patch there is no backend support for the
vlan element for *any* network device type. When support is added in
later patches, it will only be for those select network types that
support setting up a vlan on the host side, without the guest's
involvement. (For example, it will be possible to configure a vlan for
a guest connected to an openvswitch bridge, but it won't be possible
to do that for one that is connected to a standard Linux host bridge.)

22 files changed, 411 insertions, 5 deletions

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index fb25cb838..2c5c45632 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2857,6 +2857,46 @@ qemu-kvm -net nic,model=? /dev/null
       <span class="since">Since 0.9.4</span>
     </p>
 
+    <h5><a name="elementVlanTag">Setting VLAN tag (on supported network types only)</a></h5>
+
+<pre>
+  ...
+  &lt;devices&gt;
+    &lt;interface type='bridge'&gt;
+      <b>&lt;vlan&gt;</b>
+        <b>&lt;tag id='42'/&gt;</b>
+      <b>&lt;/vlan&gt;</b>
+      &lt;source bridge='ovsbr0'/&gt;
+      &lt;virtualport type='openvswitch'&gt;
+        &lt;parameters interfaceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/&gt;
+      &lt;/virtualport&gt;
+    &lt;/interface&gt;
+  &lt;devices&gt;
+  ...</pre>
+
+    <p>
+      If (and only if) the network connection used by the guest
+      supports vlan tagging transparent to the guest, an
+      optional <code>&lt;vlan&gt;</code> element can specify one or
+      more vlan tags to apply to the guest's network
+      traffic <span class="since">Since 0.10.0</span>. (openvswitch
+      and type='hostdev' SR-IOV interfaces do support transparent vlan
+      tagging of guest traffic; everything else, including standard
+      linux bridges and libvirt's own virtual networks, <b>do not</b>
+      support it. 802.1Qbh (vn-link) and 802.1Qbg (VEPA) switches
+      provide their own way (outside of libvirt) to tag guest traffic
+      onto specific vlans.) To allow for specification of multiple
+      tags (in the case of vlan trunking), a
+      subelement, <code>&lt;tag%gt;</code>, specifies which vlan tag
+      to use (for example: <code>&lt;tag id='42'/&gt;</code>. If an
+      interface has more than one <code>&lt;vlan&gt;</code> element
+      defined, it is assumed that the user wants to do VLAN trunking
+      using all the specified tags. In the case that vlan trunking
+      with a single tag is desired, the optional
+      attribute <code>trunk='yes'</code> can be added to the toplevel
+      vlan element.
+    </p>
+
     <h5><a name="elementLink">Modifying virtual link state</a></h5>
 <pre>
   ...
diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index a010cbd21..ed9f7a9db 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -306,6 +306,56 @@
         <span class="since">Since 0.9.4</span>
       </p>
 
+    <h5><a name="elementVlanTag">Setting VLAN tag (on supported network types only)</a></h5>
+
+<pre>
+  ...
+  &lt;devices&gt;
+    &lt;interface type='bridge'&gt;
+      <b>&lt;vlan trunk='yes'&gt;</b>
+        <b>&lt;tag id='42'/&gt;</b>
+        <b>&lt;tag id='47'/&gt;</b>
+      <b>&lt;/vlan&gt;</b>
+      &lt;source bridge='ovsbr0'/&gt;
+      &lt;virtualport type='openvswitch'&gt;
+        &lt;parameters interfaceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/&gt;
+      &lt;/virtualport&gt;
+    &lt;/interface&gt;
+  &lt;devices&gt;
+  ...</pre>
+
+    <p>
+      If (and only if) the network type supports vlan tagging
+      transparent to the guest, an optional <code>&lt;vlan&gt;</code>
+      element can specify one or more vlan tags to apply to the
+      traffic of all guests using this
+      network <span class="since">Since 0.10.0</span>. (openvswitch
+      and type='hostdev' SR-IOV networks do support transparent vlan
+      tagging of guest traffic; everything else, including standard
+      linux bridges and libvirt's own virtual networks, <b>do not</b>
+      support it. 802.1Qbh (vn-link) and 802.1Qbg (VEPA) switches
+      provide their own way (outside of libvirt) to tag guest traffic
+      onto specific vlans.) As expected, the <code>tag</code>
+      attribute specifies which vlan tag to use. If a network has more
+      than one <code>&lt;vlan&gt;</code> element defined, it is
+      assumed that the user wants to do VLAN trunking using all the
+      specified tags. In the case that vlan trunking with a single tag
+      is desired, the optional attribute <code>trunk='yes'</code> can
+      be added to the vlan element.
+    </p>
+    <p>
+      <code>&lt;vlan&gt;</code> elements can also be specified in
+      a <code>&lt;portgroup&gt;</code> element, as well as directly in
+      a domain's <code>&lt;interface&gt;</code> element. In the case
+      that a vlan tag is specified in multiple locations, the setting
+      in <code>&lt;interface&gt;</code> takes precedence, followed by
+      the setting in the <code>&lt;portgroup&gt;</code> selected by
+      the interface config. The <code>&lt;vlan&gt;</code>
+      in <code>&lt;network&gt;</code> will be selected only if none is
+      given in <code>&lt;portgroup&gt;</code>
+      or <code>&lt;interface&gt;</code>.
+    </p>
+
     <h5><a name="elementsPortgroup">Portgroups</a></h5>
 
 <pre>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 767fccda0..4903ca69e 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1713,6 +1713,9 @@
       <optional>
         <ref name="bandwidth"/>
       </optional>
+      <optional>
+        <ref name="vlan"/>
+      </optional>
     </interleave>
   </define>
   <!--
diff --git a/docs/schemas/network.rng b/docs/schemas/network.rng
index 124c9f982..e55105a14 100644
--- a/docs/schemas/network.rng
+++ b/docs/schemas/network.rng
@@ -140,6 +140,9 @@
               <optional>
                 <ref name="bandwidth"/>
               </optional>
+            <optional>
+              <ref name="vlan"/>
+            </optional>
             </interleave>
           </element>
         </zeroOrMore>
@@ -188,6 +191,9 @@
          <ref name="bandwidth"/>
        </optional>
        <optional>
+         <ref name="vlan"/>
+       </optional>
+       <optional>
          <element name="link">
            <attribute name="state">
              <choice>
diff --git a/docs/schemas/networkcommon.rng b/docs/schemas/networkcommon.rng
index f2c333074..c7749e718 100644
--- a/docs/schemas/networkcommon.rng
+++ b/docs/schemas/networkcommon.rng
@@ -184,4 +184,24 @@
       <param name="pattern">(ipv4)|(ipv6)</param>
     </data>
   </define>
+
+  <define name="vlan">
+    <element name="vlan">
+      <optional>
+        <attribute name="trunk">
+          <value>yes</value>
+        </attribute>
+      </optional>
+      <oneOrMore>
+        <element name="tag">
+          <attribute name="id">
+            <data type="unsignedInt">
+              <param name="maxInclusive">4095</param>
+            </data>
+          </attribute>
+          <empty/>
+        </element>
+      </oneOrMore>
+    </element>
+  </define>
 </grammar>
diff --git a/po/POTFILES.in b/po/POTFILES.in
index e61795292..642472682 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -11,6 +11,7 @@ src/conf/domain_conf.c
 src/conf/domain_event.c
 src/conf/interface_conf.c
 src/conf/netdev_bandwidth_conf.c
+src/conf/netdev_vlan_conf.c
 src/conf/netdev_vport_profile_conf.c
 src/conf/network_conf.c
 src/conf/node_device_conf.c
diff --git a/src/Makefile.am b/src/Makefile.am
index fef391724..b5f8056d3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -144,7 +144,8 @@ LOCK_DRIVER_SANLOCK_SOURCES = \
 
 NETDEV_CONF_SOURCES =						\
 		conf/netdev_bandwidth_conf.h conf/netdev_bandwidth_conf.c \
-		conf/netdev_vport_profile_conf.h conf/netdev_vport_profile_conf.c
+		conf/netdev_vport_profile_conf.h conf/netdev_vport_profile_conf.c \
+		conf/netdev_vlan_conf.h conf/netdev_vlan_conf.c
 
 # XML configuration format handling sources
 # Domain driver generic impl APIs
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 62f5f5b08..a2e73c69a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -51,6 +51,7 @@
 #include "secret_conf.h"
 #include "netdev_vport_profile_conf.h"
 #include "netdev_bandwidth_conf.h"
+#include "netdev_vlan_conf.h"
 
 #define VIR_FROM_THIS VIR_FROM_DOMAIN
 
@@ -1030,7 +1031,7 @@ virDomainActualNetDefFree(virDomainActualNetDefPtr def)
 
     VIR_FREE(def->virtPortProfile);
     virNetDevBandwidthFree(def->bandwidth);
-
+    virNetDevVlanClear(&def->vlan);
     VIR_FREE(def);
 }
 
@@ -1091,6 +1092,7 @@ void virDomainNetDefFree(virDomainNetDefPtr def)
     virNWFilterHashTableFree(def->filterparams);
 
     virNetDevBandwidthFree(def->bandwidth);
+    virNetDevVlanClear(&def->vlan);
 
     VIR_FREE(def);
 }
@@ -4365,6 +4367,7 @@ virDomainActualNetDefParseXML(xmlNodePtr node,
     int ret = -1;
     xmlNodePtr save_ctxt = ctxt->node;
     xmlNodePtr bandwidth_node = NULL;
+    xmlNodePtr vlanNode;
     xmlNodePtr virtPortNode;
     char *type = NULL;
     char *mode = NULL;
@@ -4462,6 +4465,10 @@ virDomainActualNetDefParseXML(xmlNodePtr node,
         !(actual->bandwidth = virNetDevBandwidthParse(bandwidth_node)))
         goto error;
 
+    vlanNode = virXPathNode("./vlan", ctxt);
+    if (vlanNode && virNetDevVlanParse(vlanNode, ctxt, &actual->vlan) < 0)
+       goto error;
+
     *def = actual;
     actual = NULL;
     ret = 0;
@@ -4645,6 +4652,9 @@ virDomainNetDefParseXML(virCapsPtr caps,
             } else if (xmlStrEqual(cur->name, BAD_CAST "bandwidth")) {
                 if (!(def->bandwidth = virNetDevBandwidthParse(cur)))
                     goto error;
+            } else if (xmlStrEqual(cur->name, BAD_CAST "vlan")) {
+                if (virNetDevVlanParse(cur, ctxt, &def->vlan) < 0)
+                    goto error;
             }
         }
         cur = cur->next;
@@ -11623,8 +11633,10 @@ virDomainActualNetDefFormat(virBufferPtr buf,
         return -1;
     }
 
+    if (virNetDevVlanFormat(&def->vlan, buf) < 0)
+        return -1;
     if (virNetDevVPortProfileFormat(def->virtPortProfile, buf) < 0)
-       return -1;
+        return -1;
     if (virNetDevBandwidthFormat(def->bandwidth, buf) < 0)
         return -1;
 
@@ -11725,8 +11737,10 @@ virDomainNetDefFormat(virBufferPtr buf,
         break;
     }
 
+    if (virNetDevVlanFormat(&def->vlan, buf) < 0)
+        return -1;
     if (virNetDevVPortProfileFormat(def->virtPortProfile, buf) < 0)
-       return -1;
+        return -1;
     virBufferEscapeString(buf, "<script path='%s'/>\n",
                           def->script);
     if (def->ifname &&
@@ -15083,6 +15097,17 @@ virDomainNetGetActualBandwidth(virDomainNetDefPtr iface)
     return iface->bandwidth;
 }
 
+virNetDevVlanPtr
+virDomainNetGetActualVlan(virDomainNetDefPtr iface)
+{
+    if (iface->type == VIR_DOMAIN_NET_TYPE_NETWORK &&
+        iface->data.network.actual &&
+        iface->data.network.actual->vlan.nTags > 0)
+        return &iface->data.network.actual->vlan;
+    if (iface->vlan.nTags > 0)
+        return &iface->vlan;
+    return 0;
+}
 
 /* Return listens[ii] from the appropriate union for the graphics
  * type, or NULL if this is an unsuitable type, or the index is out of
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 8d024b375..fae77922f 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -43,6 +43,7 @@
 # include "virnetdevvportprofile.h"
 # include "virnetdevopenvswitch.h"
 # include "virnetdevbandwidth.h"
+# include "virnetdevvlan.h"
 # include "virobject.h"
 
 /* forward declarations of all device types, required by
@@ -781,6 +782,7 @@ struct _virDomainActualNetDef {
     } data;
     virNetDevVPortProfilePtr virtPortProfile;
     virNetDevBandwidthPtr bandwidth;
+    virNetDevVlan vlan;
 };
 
 /* Stores the virtual network interface configuration */
@@ -845,6 +847,7 @@ struct _virDomainNetDef {
     char *filter;
     virNWFilterHashTablePtr filterparams;
     virNetDevBandwidthPtr bandwidth;
+    virNetDevVlan vlan;
     int linkstate;
 };
 
@@ -2039,6 +2042,7 @@ virNetDevVPortProfilePtr
 virDomainNetGetActualVirtPortProfile(virDomainNetDefPtr iface);
 virNetDevBandwidthPtr
 virDomainNetGetActualBandwidth(virDomainNetDefPtr iface);
+virNetDevVlanPtr virDomainNetGetActualVlan(virDomainNetDefPtr iface);
 
 int virDomainControllerInsert(virDomainDefPtr def,
                               virDomainControllerDefPtr controller);
diff --git a/src/conf/netdev_vlan_conf.c b/src/conf/netdev_vlan_conf.c
new file mode 100644
index 000000000..f3a987fa2
--- /dev/null
+++ b/src/conf/netdev_vlan_conf.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2009-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *     Laine Stump <laine@redhat.com>
+ */
+
+#include <config.h>
+
+#include "netdev_vlan_conf.h"
+#include "virterror_internal.h"
+#include "memory.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+int
+virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr def)
+{
+    int ret = -1;
+    xmlNodePtr save = ctxt->node;
+    const char *trunk;
+    xmlNodePtr *tagNodes = NULL;
+    int nTags, ii;
+
+    ctxt->node = node;
+
+    nTags = virXPathNodeSet("./tag", ctxt, &tagNodes);
+    if (nTags < 0)
+        goto error;
+
+    if (nTags == 0) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("missing tag id - each <vlan> must have "
+                         "at least one <tag id='n'/> subelement"));
+        goto error;
+    }
+
+    if (VIR_ALLOC_N(def->tag, nTags) < 0) {
+        virReportOOMError();
+        goto error;
+    }
+
+    for (ii = 0; ii < nTags; ii++) {
+        unsigned long id;
+
+        ctxt->node = tagNodes[ii];
+        if (virXPathULong("string(./@id)", ctxt, &id) < 0) {
+            virReportError(VIR_ERR_XML_ERROR, "%s",
+                           _("missing or invalid vlan tag id attribute"));
+            goto error;
+        }
+        if (id > 4095) {
+            virReportError(VIR_ERR_XML_ERROR,
+                           _("vlan tag id %lu too large (maximum 4095)"), id);
+            goto error;
+        }
+        def->tag[ii] = id;
+    }
+
+    def->nTags = nTags;
+
+    /* now that we know how many tags there are, look for an explicit
+     * trunk setting.
+     */
+    if (nTags > 1)
+        def->trunk = true;
+
+    ctxt->node = node;
+    if ((trunk = virXPathString("string(./@trunk)", ctxt)) != NULL) {
+        def->trunk = STRCASEEQ(trunk, "yes");
+        if (!def->trunk) {
+            if (nTags > 1) {
+                virReportError(VIR_ERR_XML_ERROR,
+                               _("invalid \"trunk='%s'\" in <vlan> - trunk='yes' "
+                                 "is required for more than one vlan tag"), trunk);
+                goto error;
+            }
+            /* allow (but discard) "trunk='no' if there is a single tag */
+            if (STRCASENEQ(trunk, "no")) {
+                virReportError(VIR_ERR_XML_ERROR,
+                               _("invalid \"trunk='%s'\" in <vlan> "
+                                 "- must be yes or no"), trunk);
+                goto error;
+            }
+        }
+    }
+
+    ret = 0;
+error:
+    ctxt->node = save;
+    VIR_FREE(tagNodes);
+    if (ret < 0)
+        virNetDevVlanClear(def);
+    return ret;
+}
+
+int
+virNetDevVlanFormat(virNetDevVlanPtr def, virBufferPtr buf)
+{
+    int ii;
+
+    if (def->nTags == 0)
+        return 0;
+
+    if (!def->tag) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("missing vlan tag data"));
+        return -1;
+    }
+
+    virBufferAsprintf(buf, "<vlan%s>\n", def->trunk ? " trunk='yes'" : "");
+    for (ii = 0; ii < def->nTags; ii++) {
+        virBufferAsprintf(buf, "  <tag id='%u'/>\n", def->tag[ii]);
+    }
+    virBufferAddLit(buf, "</vlan>\n");
+    return 0;
+}
diff --git a/src/conf/netdev_vlan_conf.h b/src/conf/netdev_vlan_conf.h
new file mode 100644
index 000000000..1453dcdc4
--- /dev/null
+++ b/src/conf/netdev_vlan_conf.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2009-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *     Laine Stump <laine@redhat.com>
+ */
+
+#ifndef __VIR_NETDEV_VLAN_CONF_H__
+# define __VIR_NETDEV_VLAN_CONF_H__
+
+# include "internal.h"
+# include "virnetdevvlan.h"
+# include "buf.h"
+# include "xml.h"
+
+int virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr def);
+int virNetDevVlanFormat(virNetDevVlanPtr def, virBufferPtr buf);
+
+#endif /* __VIR_NETDEV_VPORT_PROFILE_CONF_H__ */
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index 45f8e698e..db8c62f4e 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -36,6 +36,7 @@
 #include "network_conf.h"
 #include "netdev_vport_profile_conf.h"
 #include "netdev_bandwidth_conf.h"
+#include "netdev_vlan_conf.h"
 #include "memory.h"
 #include "xml.h"
 #include "uuid.h"
@@ -88,6 +89,7 @@ virPortGroupDefClear(virPortGroupDefPtr def)
     VIR_FREE(def->name);
     VIR_FREE(def->virtPortProfile);
     virNetDevBandwidthFree(def->bandwidth);
+    virNetDevVlanClear(&def->vlan);
     def->bandwidth = NULL;
 }
 
@@ -187,7 +189,7 @@ void virNetworkDefFree(virNetworkDefPtr def)
     VIR_FREE(def->virtPortProfile);
 
     virNetDevBandwidthFree(def->bandwidth);
-
+    virNetDevVlanClear(&def->vlan);
     VIR_FREE(def);
 }
 
@@ -890,6 +892,7 @@ virNetworkPortGroupParseXML(virPortGroupDefPtr def,
 
     xmlNodePtr save;
     xmlNodePtr virtPortNode;
+    xmlNodePtr vlanNode;
     xmlNodePtr bandwidth_node;
     char *isDefault = NULL;
 
@@ -915,6 +918,10 @@ virNetworkPortGroupParseXML(virPortGroupDefPtr def,
         goto error;
     }
 
+    vlanNode = virXPathNode("./vlan", ctxt);
+    if (vlanNode && virNetDevVlanParse(vlanNode, ctxt, &def->vlan) < 0)
+        goto error;
+
     result = 0;
 error:
     if (result < 0) {
@@ -943,6 +950,7 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
     char *forwardDev = NULL;
     xmlNodePtr save = ctxt->node;
     xmlNodePtr bandwidthNode = NULL;
+    xmlNodePtr vlanNode;
 
     if (VIR_ALLOC(def) < 0) {
         virReportOOMError();
@@ -982,6 +990,10 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
         (def->bandwidth = virNetDevBandwidthParse(bandwidthNode)) == NULL)
         goto error;
 
+    vlanNode = virXPathNode("./vlan", ctxt);
+    if (vlanNode && virNetDevVlanParse(vlanNode, ctxt, &def->vlan) < 0)
+        goto error;
+
     /* Parse bridge information */
     def->bridge = virXPathString("string(./bridge[1]/@name)", ctxt);
     stp = virXPathString("string(./bridge[1]/@stp)", ctxt);
@@ -1448,6 +1460,8 @@ virPortGroupDefFormat(virBufferPtr buf,
     }
     virBufferAddLit(buf, ">\n");
     virBufferAdjustIndent(buf, 4);
+    if (virNetDevVlanFormat(&def->vlan, buf) < 0)
+        return -1;
     if (virNetDevVPortProfileFormat(def->virtPortProfile, buf) < 0)
         return -1;
     virNetDevBandwidthFormat(def->bandwidth, buf);
@@ -1542,6 +1556,8 @@ char *virNetworkDefFormat(const virNetworkDefPtr def, unsigned int flags)
         goto error;
 
     virBufferAdjustIndent(&buf, 2);
+    if (virNetDevVlanFormat(&def->vlan, &buf) < 0)
+        goto error;
     if (virNetDevBandwidthFormat(def->bandwidth, &buf) < 0)
         goto error;
     virBufferAdjustIndent(&buf, -2);
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index 32fc76502..a029f7070 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -35,6 +35,7 @@
 # include "virsocketaddr.h"
 # include "virnetdevbandwidth.h"
 # include "virnetdevvportprofile.h"
+# include "virnetdevvlan.h"
 # include "virmacaddr.h"
 
 enum virNetworkForwardType {
@@ -148,6 +149,7 @@ struct _virPortGroupDef {
     bool isDefault;
     virNetDevVPortProfilePtr virtPortProfile;
     virNetDevBandwidthPtr bandwidth;
+    virNetDevVlan vlan;
 };
 
 typedef struct _virNetworkDef virNetworkDef;
@@ -185,6 +187,7 @@ struct _virNetworkDef {
     size_t nPortGroups;
     virPortGroupDefPtr portGroups;
     virNetDevBandwidthPtr bandwidth;
+    virNetDevVlan vlan;
 };
 
 typedef struct _virNetworkObj virNetworkObj;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 2c95f943f..d5912ed0c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -406,6 +406,7 @@ virDomainNetGetActualDirectMode;
 virDomainNetGetActualHostdev;
 virDomainNetGetActualType;
 virDomainNetGetActualVirtPortProfile;
+virDomainNetGetActualVlan;
 virDomainNetIndexByMac;
 virDomainNetInsert;
 virDomainNetRemove;
@@ -787,6 +788,11 @@ virNetDevBandwidthFormat;
 virNetDevBandwidthParse;
 
 
+#netdev_vlan_conf.h
+virNetDevVlanFormat;
+virNetDevVlanParse;
+
+
 # netdev_vportprofile_conf.h
 virNetDevVPortProfileFormat;
 virNetDevVPortProfileParse;
diff --git a/tests/networkxml2xmlin/8021Qbh-net.xml b/tests/networkxml2xmlin/8021Qbh-net.xml
index 2d779dcac..3aaab61db 100644
--- a/tests/networkxml2xmlin/8021Qbh-net.xml
+++ b/tests/networkxml2xmlin/8021Qbh-net.xml
@@ -8,6 +8,9 @@
     <interface dev="eth4"/>
     <interface dev="eth5"/>
   </forward>
+  <vlan>
+    <tag id='549'/>
+  </vlan>
   <virtualport type="802.1Qbh">
     <parameters profileid="spongebob24"/>
   </virtualport>
diff --git a/tests/networkxml2xmlin/openvswitch-net.xml b/tests/networkxml2xmlin/openvswitch-net.xml
index 8aa1897ab..a3d82b165 100644
--- a/tests/networkxml2xmlin/openvswitch-net.xml
+++ b/tests/networkxml2xmlin/openvswitch-net.xml
@@ -4,11 +4,19 @@
   <forward mode='bridge'/>
   <virtualport type='openvswitch'/>
   <portgroup name='bob' default='yes'>
+    <vlan trunk='yes'>
+      <tag id='666'/>
+    </vlan>
     <virtualport>
       <parameters profileid='bob-profile'/>
     </virtualport>
   </portgroup>
   <portgroup name='alice'>
+    <vlan trunk='yes'>
+      <tag id='777'/>
+      <tag id='888'/>
+      <tag id='999'/>
+    </vlan>
     <virtualport>
       <parameters profileid='alice-profile'/>
     </virtualport>
diff --git a/tests/networkxml2xmlout/8021Qbh-net.xml b/tests/networkxml2xmlout/8021Qbh-net.xml
index d4d5b4b44..281466a9f 100644
--- a/tests/networkxml2xmlout/8021Qbh-net.xml
+++ b/tests/networkxml2xmlout/8021Qbh-net.xml
@@ -8,6 +8,9 @@
     <interface dev='eth4'/>
     <interface dev='eth5'/>
   </forward>
+  <vlan>
+    <tag id='549'/>
+  </vlan>
   <virtualport type='802.1Qbh'>
     <parameters profileid='spongebob24'/>
   </virtualport>
diff --git a/tests/networkxml2xmlout/openvswitch-net.xml b/tests/networkxml2xmlout/openvswitch-net.xml
index 8aa1897ab..a3d82b165 100644
--- a/tests/networkxml2xmlout/openvswitch-net.xml
+++ b/tests/networkxml2xmlout/openvswitch-net.xml
@@ -4,11 +4,19 @@
   <forward mode='bridge'/>
   <virtualport type='openvswitch'/>
   <portgroup name='bob' default='yes'>
+    <vlan trunk='yes'>
+      <tag id='666'/>
+    </vlan>
     <virtualport>
       <parameters profileid='bob-profile'/>
     </virtualport>
   </portgroup>
   <portgroup name='alice'>
+    <vlan trunk='yes'>
+      <tag id='777'/>
+      <tag id='888'/>
+      <tag id='999'/>
+    </vlan>
     <virtualport>
       <parameters profileid='alice-profile'/>
     </virtualport>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-hostdev.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-hostdev.xml
index 51b09e914..81f70d0d4 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-hostdev.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-hostdev.xml
@@ -26,6 +26,9 @@
       <source>
         <address type='pci' domain='0x0002' bus='0x03' slot='0x07' function='0x1'/>
       </source>
+      <vlan>
+        <tag id='42'/>
+      </vlan>
       <virtualport type='802.1Qbg'>
         <parameters managerid='11' typeid='1193047' typeidversion='2' instanceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/>
       </virtualport>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-openvswitch.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-openvswitch.xml
new file mode 100644
index 000000000..ff098448d
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-openvswitch.xml
@@ -0,0 +1,38 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <interface type='network'>
+      <mac address='00:11:22:33:44:55'/>
+      <source network='ovs-net'/>
+      <vlan trunk='yes'>
+        <tag id='42'/>
+        <tag id='48'/>
+        <tag id='456'/>
+      </vlan>
+      <virtualport type='openvswitch'>
+        <parameters interfaceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f' profileid='bob'/>
+      </virtualport>
+    </interface>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-network-portgroup.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-network-portgroup.xml
index 6d379a044..c84ed3f35 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-network-portgroup.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio-network-portgroup.xml
@@ -24,6 +24,9 @@
     <interface type='network'>
       <mac address='00:11:22:33:44:55'/>
       <source network='rednet' portgroup='bob'/>
+      <vlan>
+        <tag id='4095'/>
+      </vlan>
       <virtualport type='802.1Qbg'>
         <parameters managerid='11' typeid='1193047' typeidversion='2' instanceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/>
       </virtualport>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index dcdba4fc6..da298b7aa 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -178,6 +178,7 @@ mymain(void)
     DO_TEST("net-eth-ifname");
     DO_TEST("net-virtio-network-portgroup");
     DO_TEST("net-hostdev");
+    DO_TEST("net-openvswitch");
     DO_TEST("sound");
     DO_TEST("sound-device");
     DO_TEST("net-bandwidth");