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[libvirt] [PATCHv4] Configure native vlan modes on Open vSwitch ports



This patch adds functionality to allow libvirt to configure the
'native-tagged' and 'native-untagged' modes on openvswitch networks.

v2 changes:
Fix problems reported by Eric Blake

v3 changes:
Re work patch to address review comments

v4 changes:
Use enum for native modes

---

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 9284534..ba32185 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -3498,6 +3498,13 @@ qemu-kvm -net nic,model=? /dev/null
         <parameters interfaceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/>
       </virtualport>
     </interface>
+    <interface type='bridge'>
+      <b>&lt;vlan trunk='yes'&gt;</b>
+        <b>&lt;tag id='42'/&gt;</b>
+        <b>&lt;tag id='123' nativeMode='untagged'/&gt;</b>
+      <b>&lt;/vlan&gt;</b>
+      ...
+    &lt;/interface&gt;
   &lt;devices&gt;
   ...</pre>
 
@@ -3524,6 +3531,15 @@ qemu-kvm -net nic,model=? /dev/null
       vlan element.
     </p>
 
+    <p>
+      For network connections using openvswitch it is possible to
+      configure the 'native-tagged' and 'native-untagged' vlan modes
+      <span class="since">(Since 1.0.5).</span> This uses the optional
+      <code>nativeMode</code> attribute on the <code>&lt;tag&gt;</code>
+      element: <code>nativeMode</code> may be set to 'tagged' or
+      'untagged'. The id atribute of the element sets the native vlan.
+    </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 a1198ce..29e12d9 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -446,6 +446,13 @@
         &lt;parameters interfaceid='09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f'/&gt;
       &lt;/virtualport&gt;
     &lt;/interface&gt;
+    &lt;interface type='bridge'&gt;
+      <b>&lt;vlan trunk='yes'&gt;</b>
+        <b>&lt;tag id='42'/&gt;</b>
+        <b>&lt;tag id='123' nativeMode='untagged'/&gt;</b>
+      <b>&lt;/vlan&gt;</b>
+      ...
+    &lt;/interface&gt;
   &lt;devices&gt;
   ...</pre>
 
@@ -469,6 +476,14 @@
       be added to the vlan element.
     </p>
     <p>
+      For network connections using openvswitch it is possible to
+      configure the 'native-tagged' and 'native-untagged' vlan modes
+      <span class="since">(Since 1.0.6).</span> This uses the optional
+      <code>nativeMode</code> attribute on the <code>&lt;tag&gt;</code>
+      element: <code>nativeMode</code> may be set to 'tagged' or
+      'untagged'. The id atribute of the element sets the native vlan.
+    </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
diff --git a/docs/schemas/networkcommon.rng b/docs/schemas/networkcommon.rng
index 51ff759..e60f1fc 100644
--- a/docs/schemas/networkcommon.rng
+++ b/docs/schemas/networkcommon.rng
@@ -204,6 +204,14 @@
               <param name="maxInclusive">4095</param>
             </data>
           </attribute>
+          <optional>
+            <attribute name="nativeMode">
+              <choice>
+                <value>tagged</value>
+                <value>untagged</value>
+              </choice>
+            </attribute>
+          </optional>
           <empty/>
         </element>
       </oneOrMore>
diff --git a/src/conf/netdev_vlan_conf.c b/src/conf/netdev_vlan_conf.c
index 13ba8c6..2b4cd48 100644
--- a/src/conf/netdev_vlan_conf.c
+++ b/src/conf/netdev_vlan_conf.c
@@ -17,6 +17,7 @@
  *
  * Authors:
  *     Laine Stump <laine redhat com>
+ *     James Robson <jrobson websense com>
  */
 
 #include <config.h>
@@ -27,12 +28,15 @@
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
+VIR_ENUM_IMPL(virNativeVlanMode, VIR_NATIVE_VLAN_MODE_LAST, "default", "tagged", "untagged")
+
 int
 virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr def)
 {
     int ret = -1;
     xmlNodePtr save = ctxt->node;
     const char *trunk = NULL;
+    const char *nativeMode = NULL;
     xmlNodePtr *tagNodes = NULL;
     int nTags, ii;
 
@@ -54,6 +58,8 @@ virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr de
         goto error;
     }
 
+    def->nativeMode = 0;
+    def->nativeTag = 0;
     for (ii = 0; ii < nTags; ii++) {
         unsigned long id;
 
@@ -68,6 +74,19 @@ virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr de
                            _("vlan tag id %lu too large (maximum 4095)"), id);
             goto error;
         }
+        if ((nativeMode = virXPathString("string(./@nativeMode)", ctxt)) != NULL) {
+            if (def->nativeMode != 0) {
+                virReportError(VIR_ERR_XML_ERROR, "%s",
+                               _("duplicate native vlan setting"));
+                goto error;
+            }
+            if ((def->nativeMode = virNativeVlanModeTypeFromString(nativeMode)) <= 0) {
+                virReportError(VIR_ERR_XML_ERROR,
+                               _("Attribute \"nativeMode='%s'\" is invalid"), nativeMode);
+                goto error;
+            }
+            def->nativeTag = id;
+        }
         def->tag[ii] = id;
     }
 
@@ -89,6 +108,12 @@ virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr de
                                  "is required for more than one vlan tag"), trunk);
                 goto error;
             }
+            if (def->nativeMode != 0) {
+                virReportError(VIR_ERR_XML_ERROR, "%s",
+                               _("invalid configuration in <vlan> - \"trunk='no'\" is "
+                                 "not allowed with a native vlan id"));
+                goto error;
+            }
             /* allow (but discard) "trunk='no' if there is a single tag */
             if (STRCASENEQ(trunk, "no")) {
                 virReportError(VIR_ERR_XML_ERROR,
@@ -125,7 +150,17 @@ virNetDevVlanFormat(virNetDevVlanPtr def, virBufferPtr buf)
 
     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]);
+        if (def->nativeMode != VIR_NATIVE_VLAN_MODE_DEFAULT && def->nativeTag == def->tag[ii]) {
+            /* check the nativeMode in case we get <tag id='0'/>*/
+            const char *mode = virNativeVlanModeTypeToString(def->nativeMode);
+            if (!mode) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("Bad vlaue for nativeMode"));
+            }
+            virBufferAsprintf(buf, "  <tag id='%u' nativeMode='%s'/>\n", def->tag[ii], mode);
+        } else {
+            virBufferAsprintf(buf, "  <tag id='%u'/>\n", def->tag[ii]);
+        }
     }
     virBufferAddLit(buf, "</vlan>\n");
     return 0;
diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c
index 2aee445..47e6027 100644
--- a/src/util/virnetdevopenvswitch.c
+++ b/src/util/virnetdevopenvswitch.c
@@ -109,8 +109,22 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
     virCommandAddArgList(cmd, "--timeout=5", "--", "--may-exist", "add-port",
                         brname, ifname, NULL);
 
-    if (virBufferUse(&buf) != 0)
+    if (virBufferUse(&buf) != 0) {
+        switch (virtVlan->nativeMode) {
+            case VIR_NATIVE_VLAN_MODE_TAGGED:
+                virCommandAddArg(cmd, "vlan_mode=native-tagged");
+                virCommandAddArgFormat(cmd, "tag=%d", virtVlan->nativeTag);
+                break;
+            case VIR_NATIVE_VLAN_MODE_UNTAGGED:
+                virCommandAddArg(cmd, "vlan_mode=native-untagged");
+                virCommandAddArgFormat(cmd, "tag=%d", virtVlan->nativeTag);
+                break;
+            case VIR_NATIVE_VLAN_MODE_DEFAULT:
+            default:
+                break;
+        }
         virCommandAddArgList(cmd, virBufferCurrentContent(&buf), NULL);
+    }
 
     if (ovsport->profileID[0] == '\0') {
         virCommandAddArgList(cmd,
diff --git a/src/util/virnetdevvlan.c b/src/util/virnetdevvlan.c
index 2fe2017..eed32f7 100644
--- a/src/util/virnetdevvlan.c
+++ b/src/util/virnetdevvlan.c
@@ -33,6 +33,8 @@ virNetDevVlanClear(virNetDevVlanPtr vlan)
 {
     VIR_FREE(vlan->tag);
     vlan->nTags = 0;
+    vlan->nativeMode = 0;
+    vlan->nativeTag = 0;
 }
 
 void
@@ -54,7 +56,9 @@ virNetDevVlanEqual(const virNetDevVlanPtr a, const virNetDevVlanPtr b)
         return false;
 
     if (a->trunk != b->trunk ||
-        a->nTags != b->nTags) {
+        a->nTags != b->nTags ||
+        a->nativeMode != b->nativeMode ||
+        a->nativeTag != b->nativeTag) {
         return false;
     }
 
@@ -89,6 +93,8 @@ virNetDevVlanCopy(virNetDevVlanPtr dst, const virNetDevVlanPtr src)
 
     dst->trunk = src->trunk;
     dst->nTags = src->nTags;
+    dst->nativeMode = src->nativeMode;
+    dst->nativeTag = src->nativeTag;
     memcpy(dst->tag, src->tag, src->nTags * sizeof(*src->tag));
     return 0;
 }
diff --git a/src/util/virnetdevvlan.h b/src/util/virnetdevvlan.h
index c6b16ef..a084938 100644
--- a/src/util/virnetdevvlan.h
+++ b/src/util/virnetdevvlan.h
@@ -18,16 +18,28 @@
  * Authors:
  *      Laine Stump <laine redhat com>
  */
-
+# include <virutil.h>
 #ifndef __VIR_NETDEV_VLAN_H__
 # define __VIR_NETDEV_VLAN_H__
 
+typedef enum {
+    VIR_NATIVE_VLAN_MODE_DEFAULT = 0,
+    VIR_NATIVE_VLAN_MODE_TAGGED,
+    VIR_NATIVE_VLAN_MODE_UNTAGGED,
+
+    VIR_NATIVE_VLAN_MODE_LAST
+} virNativeVlanMode;
+
+VIR_ENUM_DECL(virNativeVlanMode)
+
 typedef struct _virNetDevVlan virNetDevVlan;
 typedef virNetDevVlan *virNetDevVlanPtr;
 struct _virNetDevVlan {
     bool trunk;        /* true if this is a trunk */
     int nTags;          /* number of tags in array */
     unsigned int *tag; /* pointer to array of tags */
+    int nativeMode;
+    unsigned int nativeTag;
 };
 
 void virNetDevVlanClear(virNetDevVlanPtr vlan);
diff --git a/tests/networkxml2xmlin/openvswitch-net.xml b/tests/networkxml2xmlin/openvswitch-net.xml
index a3d82b1..2f6084d 100644
--- a/tests/networkxml2xmlin/openvswitch-net.xml
+++ b/tests/networkxml2xmlin/openvswitch-net.xml
@@ -21,4 +21,13 @@
       <parameters profileid='alice-profile'/>
     </virtualport>
   </portgroup>
+  <portgroup name='native'>
+    <vlan trunk='yes'>
+      <tag id='123' nativeMode='tagged'/>
+      <tag id='444'/>
+    </vlan>
+    <virtualport>
+      <parameters profileid='native-profile'/>
+    </virtualport>
+  </portgroup>
 </network>
diff --git a/tests/networkxml2xmlout/openvswitch-net.xml b/tests/networkxml2xmlout/openvswitch-net.xml
index a3d82b1..2f6084d 100644
--- a/tests/networkxml2xmlout/openvswitch-net.xml
+++ b/tests/networkxml2xmlout/openvswitch-net.xml
@@ -21,4 +21,13 @@
       <parameters profileid='alice-profile'/>
     </virtualport>
   </portgroup>
+  <portgroup name='native'>
+    <vlan trunk='yes'>
+      <tag id='123' nativeMode='tagged'/>
+      <tag id='444'/>
+    </vlan>
+    <virtualport>
+      <parameters profileid='native-profile'/>
+    </virtualport>
+  </portgroup>
 </network>



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