Fix performance issues when creating/editing interfaces due to unfiltered vlan queryset

netbox/dcim/forms.py

@@ -2189,6 +2189,36 @@ class InterfaceForm(InterfaceCommonForm, BootstrapMixin, forms.ModelForm):
                 device__in=[self.instance.device, self.instance.device.get_vc_master()], type=IFACE_TYPE_LAG
             )
 
+        # Limit VLan choices to those in: global vlans, global groups, the current site's group, the current site
+        vlan_choices = []
+        global_vlans = VLAN.objects.filter(site=None, group=None)
+        vlan_choices.append(
+            ('Global', [(vlan.pk, vlan) for vlan in global_vlans])
+        )
+        for group in VLANGroup.objects.filter(site=None):
+            global_group_vlans = VLAN.objects.filter(group=group)
+            vlan_choices.append(
+                (group.name, [(vlan.pk, vlan) for vlan in global_group_vlans])
+            )
+
+        site = getattr(self.instance.device, 'site', None)
+        if site is not None:
+
+            # Add non-grouped site VLANs
+            site_vlans = VLAN.objects.filter(site=site, group=None)
+            vlan_choices.append((site.name, [(vlan.pk, vlan) for vlan in site_vlans]))
+
+            # Add grouped site VLANs
+            for group in VLANGroup.objects.filter(site=site):
+                site_group_vlans = VLAN.objects.filter(group=group)
+                vlan_choices.append((
+                    '{} / {}'.format(group.site.name, group.name),
+                    [(vlan.pk, vlan) for vlan in site_group_vlans]
+                ))
+
+        self.fields['untagged_vlan'].choices = vlan_choices
+        self.fields['tagged_vlans'].choices = vlan_choices
+
 
 class InterfaceCreateForm(InterfaceCommonForm, ComponentForm, forms.Form):
     name_pattern = ExpandableNameField(
@@ -2269,6 +2299,37 @@ class InterfaceCreateForm(InterfaceCommonForm, ComponentForm, forms.Form):
         else:
             self.fields['lag'].queryset = Interface.objects.none()
 
+        # Limit VLan choices to those in: global vlans, global groups, the current site's group, the current site
+        vlan_choices = []
+        global_vlans = VLAN.objects.filter(site=None, group=None)
+        vlan_choices.append(
+            ('Global', [(vlan.pk, vlan) for vlan in global_vlans])
+        )
+        for group in VLANGroup.objects.filter(site=None):
+            global_group_vlans = VLAN.objects.filter(group=group)
+            vlan_choices.append(
+                (group.name, [(vlan.pk, vlan) for vlan in global_group_vlans])
+            )
+
+        site = getattr(self.parent, 'site', None)
+        if site is not None:
+
+            # Add non-grouped site VLANs
+            site_vlans = VLAN.objects.filter(site=site, group=None)
+            vlan_choices.append((site.name, [(vlan.pk, vlan) for vlan in site_vlans]))
+
+            # Add grouped site VLANs
+            for group in VLANGroup.objects.filter(site=site):
+                site_group_vlans = VLAN.objects.filter(group=group)
+                vlan_choices.append((
+                    '{} / {}'.format(group.site.name, group.name),
+                    [(vlan.pk, vlan) for vlan in site_group_vlans]
+                ))
+
+        self.fields['untagged_vlan'].choices = vlan_choices
+        self.fields['tagged_vlans'].choices = vlan_choices
+
+
 
 class InterfaceBulkEditForm(InterfaceCommonForm, BootstrapMixin, AddRemoveTagsForm, BulkEditForm):
     pk = forms.ModelMultipleChoiceField(
@@ -2351,6 +2412,36 @@ class InterfaceBulkEditForm(InterfaceCommonForm, BootstrapMixin, AddRemoveTagsFo
         else:
             self.fields['lag'].choices = []
 
+        # Limit VLan choices to those in: global vlans, global groups, the current site's group, the current site
+        vlan_choices = []
+        global_vlans = VLAN.objects.filter(site=None, group=None)
+        vlan_choices.append(
+            ('Global', [(vlan.pk, vlan) for vlan in global_vlans])
+        )
+        for group in VLANGroup.objects.filter(site=None):
+            global_group_vlans = VLAN.objects.filter(group=group)
+            vlan_choices.append(
+                (group.name, [(vlan.pk, vlan) for vlan in global_group_vlans])
+            )
+        if self.parent_obj is not None:
+            site = getattr(self.parent_obj, 'site', None)
+            if site is not None:
+
+                # Add non-grouped site VLANs
+                site_vlans = VLAN.objects.filter(site=site, group=None)
+                vlan_choices.append((site.name, [(vlan.pk, vlan) for vlan in site_vlans]))
+
+                # Add grouped site VLANs
+                for group in VLANGroup.objects.filter(site=site):
+                    site_group_vlans = VLAN.objects.filter(group=group)
+                    vlan_choices.append((
+                        '{} / {}'.format(group.site.name, group.name),
+                        [(vlan.pk, vlan) for vlan in site_group_vlans]
+                    ))
+
+        self.fields['untagged_vlan'].choices = vlan_choices
+        self.fields['tagged_vlans'].choices = vlan_choices
+
 
 class InterfaceBulkRenameForm(BulkRenameForm):
     pk = forms.ModelMultipleChoiceField(