Add DVR support to DevStack

This patch introduces a new Neutron  config option: Q_DVR_MODE.

The possible values are:

- legacy  : No DVR functionality
- dvr_snat: Controller/single node DVR
- dvr     : Compute node in multi-node DVR

When DVR is enabled the following configuration changes will be
in place:

- neutron.conf
  - router_distributed=True

- l3_agent.ini
  - agent_mode=$Q_DVR_MODE

- ovs_neutron_plugin.ini:
  - enable_distributed_routing=True
  - l2_population=True
  - tunnel_types=vxlan

Supports-blueprint: neutron-ovs-dvr

Change-Id: I669e054a8489fe7ac7f5c00df6535349d477e8c4

lib/neutron

@@ -143,6 +143,17 @@ else
     Q_RR_COMMAND="sudo $NEUTRON_ROOTWRAP $Q_RR_CONF_FILE"
 fi
 
+
+# Distributed Virtual Router (DVR) configuration
+# Can be:
+#     legacy   - No DVR functionality
+#     dvr_snat - Controller or single node DVR
+#     dvr      - Compute node in multi-node DVR
+Q_DVR_MODE=${Q_DVR_MODE:-legacy}
+if [[ "$Q_DVR_MODE" != "legacy" ]]; then
+    Q_ML2_PLUGIN_MECHANISM_DRIVERS=openvswitch,linuxbridge,l2population
+fi
+
 # Provider Network Configurations
 # --------------------------------
 
@@ -304,6 +315,10 @@ function configure_neutron {
         _configure_neutron_metadata_agent
     fi
 
+    if [[ "$Q_DVR_MODE" != "legacy" ]]; then
+        _configure_dvr
+    fi
+
     _configure_neutron_debug_command
 }
 
@@ -571,7 +586,7 @@ function cleanup_neutron {
     fi
 
     # delete all namespaces created by neutron
-    for ns in $(sudo ip netns list | grep -o -E '(qdhcp|qrouter|qlbaas)-[0-9a-f-]*'); do
+    for ns in $(sudo ip netns list | grep -o -E '(qdhcp|qrouter|qlbaas|fip|snat)-[0-9a-f-]*'); do
         sudo ip netns delete ${ns}
     done
 }
@@ -749,6 +764,12 @@ function _configure_neutron_vpn {
     neutron_vpn_configure_common
 }
 
+function _configure_dvr {
+    iniset $NEUTRON_CONF DEFAULT router_distributed True
+    iniset $Q_L3_CONF_FILE DEFAULT agent_mode $Q_DVR_MODE
+}
+
+
 # _configure_neutron_plugin_agent() - Set config files for neutron plugin agent
 # It is called when q-agt is enabled.
 function _configure_neutron_plugin_agent {

lib/neutron_plugins/ml2

@@ -112,6 +112,12 @@ function neutron_plugin_configure_service {
     populate_ml2_config /$Q_PLUGIN_CONF_FILE ml2_type_vxlan $Q_ML2_PLUGIN_VXLAN_TYPE_OPTIONS
 
     populate_ml2_config /$Q_PLUGIN_CONF_FILE ml2_type_vlan $Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS
+
+    if [[ "$Q_DVR_MODE" != "legacy" ]]; then
+        populate_ml2_config /$Q_PLUGIN_CONF_FILE agent l2_population=True
+        populate_ml2_config /$Q_PLUGIN_CONF_FILE agent tunnel_types=vxlan
+        populate_ml2_config /$Q_PLUGIN_CONF_FILE agent enable_distributed_routing=True
+    fi
 }
 
 function has_neutron_plugin_security_group {