Add option to expose dvs features on nsxv plugin

This patch adds a new config option 'use_dvs_features'
that will allow to expose some dvs features like
network resource pool, promiscuous mode, traffic marking etc.
The value of 'use_dvs_features' is boolean i.e true/false.

The dvs features can be configured by managing the dvs backing
NSX-v directly.

Co-Authored-by: Giridhar Jayavelu <gjayavelu@vmware.com>

Change-Id: Ic333790c0a12db7a20995e722809257a884da664

vmware_nsx/common/config.py

@@ -18,6 +18,7 @@ from oslo_config import cfg
 
 from vmware_nsx._i18n import _, _LW
 from vmware_nsx.common import exceptions as nsx_exc
+from vmware_nsx.dvs import dvs_utils
 from vmware_nsx.extensions import routersize
 
 LOG = logging.getLogger(__name__)
@@ -396,6 +397,12 @@ nsxv_opts = [
                 help=_('List of nameservers to configure for the DHCP binding '
                        'entries. These will be used if there are no '
                        'nameservers defined on the subnet.')),
+    cfg.BoolOpt('use_dvs_features',
+                default=False,
+                help=_('If True, dvs features will be supported which '
+                       'involves configuring the dvs backing nsx_v directly. '
+                       'If False, only features exposed via nsx_v will be '
+                       'supported')),
 ]
 
 # Register the configuration options
@@ -418,3 +425,7 @@ def validate_nsxv_config_options():
         LOG.warning(_LW("dvs_id must be configured to support VLANs!"))
     if cfg.CONF.nsxv.vdn_scope_id is None:
         LOG.warning(_LW("vdn_scope_id must be configured to support VXLANs!"))
+    if cfg.CONF.nsxv.use_dvs_features and not dvs_utils.dvs_is_enabled():
+        error = _("dvs host/vcenter credentials must be defined to use "
+                  "dvs features")
+        raise nsx_exc.NsxPluginException(err_msg=error)

vmware_nsx/plugins/nsx_v/plugin.py

@@ -55,6 +55,7 @@ from neutron.extensions import securitygroup as ext_sg
 from neutron.plugins.common import constants as plugin_const
 from neutron.plugins.common import utils
 from neutron.quota import resource_registry
+from vmware_nsx.dvs import dvs
 
 import vmware_nsx
 from vmware_nsx._i18n import _, _LE, _LI, _LW
@@ -171,6 +172,11 @@ class NsxVPluginV2(addr_pair_db.AllowedAddressPairsMixin,
         self.default_section = self._create_cluster_default_fw_section()
         self._router_managers = managers.RouterTypeManager(self)
 
+        if cfg.CONF.nsxv.use_dvs_features:
+            self._dvs = dvs.DvsManager()
+        else:
+            self._dvs = None
+
         has_metadata_cfg = (
             cfg.CONF.nsxv.nova_metadata_ips
             and cfg.CONF.nsxv.mgt_net_moid