diff --git a/api-ref/source/v2/ports.inc b/api-ref/source/v2/ports.inc
index efc991856..50b14a6c3 100644
--- a/api-ref/source/v2/ports.inc
+++ b/api-ref/source/v2/ports.inc
@@ -110,6 +110,18 @@ The extension defines several attributes whose names have a prefix
 ``binding:`` including ``binding:host_id``, ``binding:vnic_type``,
 ``binding:vif_type``, ``binding:vif_details``, and ``binding:profile``.
 
+Port hints
+==========
+
+The port hints extension (``port-hints``) introduces the ``hints``
+port attribute. Hints are backend specific pieces of information,
+mainly to allow backend specific performance tuning. In itself this
+extension defines no particular hint, and therefore no valid values of
+the ``hints`` attribute. It just serves as the base for other extensions
+introducing concrete hints and signals the presence of the ``hints``
+port attribute to the API user. By default policy, use of the ``hints``
+attribute is restricted to admininstrative users.
+
 Port resource request
 =====================
 
diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index 08dd40ec4..83fd27919 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -83,6 +83,7 @@ from neutron_lib.api.definitions import network_segment_range
 from neutron_lib.api.definitions import pagination
 from neutron_lib.api.definitions import port
 from neutron_lib.api.definitions import port_device_profile
+from neutron_lib.api.definitions import port_hints
 from neutron_lib.api.definitions import port_mac_address_override
 from neutron_lib.api.definitions import port_mac_address_regenerate
 from neutron_lib.api.definitions import port_numa_affinity_policy
@@ -225,6 +226,7 @@ _ALL_API_DEFINITIONS = {
     pagination,
     port,
     port_device_profile,
+    port_hints,
     port_mac_address_override,
     port_mac_address_regenerate,
     port_numa_affinity_policy,
diff --git a/neutron_lib/api/definitions/port_hints.py b/neutron_lib/api/definitions/port_hints.py
new file mode 100644
index 000000000..6179443b3
--- /dev/null
+++ b/neutron_lib/api/definitions/port_hints.py
@@ -0,0 +1,45 @@
+# Copyright (c) 2023 Ericsson Software Technology
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from neutron_lib.api.definitions import port
+
+
+ALIAS = 'port-hints'
+IS_SHIM_EXTENSION = False
+IS_STANDARD_ATTR_EXTENSION = False
+NAME = 'Port hints'
+DESCRIPTION = 'Backend specific port hints to allow backend specific tuning'
+UPDATED_TIMESTAMP = '2023-01-01T00:00:00-00:00'
+RESOURCE_NAME = port.RESOURCE_NAME
+COLLECTION_NAME = port.COLLECTION_NAME
+HINTS = 'hints'
+
+RESOURCE_ATTRIBUTE_MAP = {
+    COLLECTION_NAME: {
+        HINTS: {
+            'allow_post': True,
+            'allow_put': True,
+            'default': None,
+            'enforce_policy': True,
+            'is_visible': True,
+            'validate': {'type:dict_or_none': None},
+        },
+    },
+}
+
+SUB_RESOURCE_ATTRIBUTE_MAP = None
+ACTION_MAP = {}
+ACTION_STATUS = {}
+REQUIRED_EXTENSIONS = []
+OPTIONAL_EXTENSIONS = []
diff --git a/neutron_lib/tests/unit/api/definitions/test_port_hints.py b/neutron_lib/tests/unit/api/definitions/test_port_hints.py
new file mode 100644
index 000000000..b2628363c
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_port_hints.py
@@ -0,0 +1,22 @@
+# Copyright 2023 Ericsson Software Technology
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from neutron_lib.api.definitions import port_hints
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class PortHintsDefinitionTestCase(base.DefinitionBaseTestCase):
+    extension_module = port_hints
+    extension_resources = (port_hints.COLLECTION_NAME,)
+    extension_attributes = (port_hints.HINTS,)
diff --git a/releasenotes/notes/port-hints-8273fa5b7454a8ef.yaml b/releasenotes/notes/port-hints-8273fa5b7454a8ef.yaml
new file mode 100644
index 000000000..0c33a1c46
--- /dev/null
+++ b/releasenotes/notes/port-hints-8273fa5b7454a8ef.yaml
@@ -0,0 +1,11 @@
+---
+features:
+  - |
+    The port hints extension (``port-hints``) introduces the ``hints``
+    port attribute. Hints are backend specific pieces of information,
+    mainly to allow backend specific performance tuning. In itself this
+    extension defines no particular hint, and therefore no valid values
+    of the ``hints`` attribute. It just serves as the base for other
+    extensions introducing concrete hints and signals the presence of
+    the ``hints`` port attribute to the API user. By default policy,
+    use of the ``hints`` attribute is restricted to admininstrative users.