xenserver: Fix vNetManager internal network compatibility with XS 5.5.0.

The previous commit depends on XAPI to add "xs-network-uuids" external IDs
for internal networks.  Only recent XAPI builds do this and in particular
the version in XenServer 5.5.0 does not.  This commit restores support
for these older XenServer versions.

The xs-network-names field is no longer set.  We plan to avoid the need for
it in the software that once used it.  It was always a bit of a kluge
anyhow.

CC: Ian Campbell <[email protected]>
Signed-off-by: Ben Pfaff <[email protected]>

xenserver/etc_xensource_scripts_vif

@@ -103,6 +103,32 @@ handle_vswitch_vif_details()
     fi
 }
 
+xs550_set_internal_network_uuid()
+{
+    . /etc/xensource-inventory
+    if test "$PRODUCT_VERSION" = "5.5.0" || test "${BUILD_NUMBER%p}" -le 26131
+    then
+        # vNetManager needs to know the network UUID(s) associated with each
+        # datapath.  Normally interface-reconfigure adds them, but XAPI does
+        # not use interface-reconfigure for internal networks. Instead, XAPI
+        # calls the addbr ioctl internally, so we have to do it here instead
+        # for internal networks.  This is only acceptable because xapi is lazy
+        # about creating internal networks: it only creates one just before it
+        # adds the first vif to it.  There may still be a brief delay between
+        # the initial ovs-vswitchd connection to vNetManager and setting this
+        # configuration variable, but vNetManager can tolerate that.
+        local bridge=$1
+        local net_uuid=$(xenstore-read "${PRIVATE}/network-uuid" 2>/dev/null)
+        if [ -n "${net_uuid}" ] ; then
+            logger -t scripts-vif "${bridge} xs-network-uuids ${net_uuid}"
+            echo "-- br-set-external-id \"$bridge\" xs-network-uuids \"${net_uuid}\""
+        fi
+    else
+        # XAPI after 5.5.0 sets the network external ids itself, via ovs-vsctl.
+        :
+    fi
+}
+
 add_to_bridge()
 {
     local address=$(xenstore-read "${PRIVATE}/bridge-MAC")
@@ -133,7 +159,7 @@ add_to_bridge()
 		local vif_details=$(handle_vswitch_vif_details)
 	    fi
 
-	    $vsctl -- --if-exists del-port $dev -- add-port $bridge $dev $vif_details
+	    $vsctl -- --if-exists del-port $dev -- add-port $bridge $dev $vif_details $(xs550_set_internal_network_uuid)
 	    ;;
     esac