diff --git a/neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py b/neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py
index 8afa3e377c9..09fe1782e44 100644
--- a/neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py
+++ b/neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py
@@ -58,9 +58,12 @@ class SriovNicSwitchMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):
                  vif_details={portbindings.CAP_PORT_FILTER: False,
                               portbindings.VIF_DETAILS_CONNECTIVITY:
                                   portbindings.CONNECTIVITY_L2},
-                 supported_vnic_types=[portbindings.VNIC_DIRECT,
-                                       portbindings.VNIC_MACVTAP,
-                                       portbindings.VNIC_DIRECT_PHYSICAL]):
+                 supported_vnic_types=[
+                     portbindings.VNIC_DIRECT,
+                     portbindings.VNIC_MACVTAP,
+                     portbindings.VNIC_DIRECT_PHYSICAL,
+                     portbindings.VNIC_ACCELERATOR_DIRECT,
+                 ]):
         """Initialize base class for SriovNicSwitch L2 agent type.
 
         :param agent_type: Constant identifying agent type in agents_db
diff --git a/neutron/tests/unit/plugins/ml2/drivers/mech_sriov/mech_driver/test_mech_sriov_nic_switch.py b/neutron/tests/unit/plugins/ml2/drivers/mech_sriov/mech_driver/test_mech_sriov_nic_switch.py
index 63f37587296..425011f388e 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/mech_sriov/mech_driver/test_mech_sriov_nic_switch.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/mech_sriov/mech_driver/test_mech_sriov_nic_switch.py
@@ -231,9 +231,11 @@ class SriovSwitchMechVnicTypesTestCase(SriovNicSwitchMechanismBaseTestCase):
             mech_driver.SriovNicSwitchMechanismDriver(
                 supported_vnic_types=self.override_vnic_types)
         self.default_supported_vnics = [
-                portbindings.VNIC_DIRECT,
-                portbindings.VNIC_MACVTAP,
-                portbindings.VNIC_DIRECT_PHYSICAL]
+            portbindings.VNIC_DIRECT,
+            portbindings.VNIC_MACVTAP,
+            portbindings.VNIC_DIRECT_PHYSICAL,
+            portbindings.VNIC_ACCELERATOR_DIRECT,
+        ]
         self.prohibit_list_cfg = {
             'SRIOV_DRIVER': {
                 'vnic_type_prohibit_list': []
@@ -284,7 +286,9 @@ class SriovSwitchMechVnicTypesTestCase(SriovNicSwitchMechanismBaseTestCase):
         self.prohibit_list_cfg['SRIOV_DRIVER']['vnic_type_prohibit_list'] = \
             [portbindings.VNIC_DIRECT,
              portbindings.VNIC_MACVTAP,
-             portbindings.VNIC_DIRECT_PHYSICAL]
+             portbindings.VNIC_DIRECT_PHYSICAL,
+             portbindings.VNIC_ACCELERATOR_DIRECT,
+             ]
 
         fake_conf = cfg.CONF
         fake_conf_fixture = base.MechDriverConfFixture(
diff --git a/releasenotes/notes/sriov_supports_accelerator_direct-e550369b6e4c18e1.yaml b/releasenotes/notes/sriov_supports_accelerator_direct-e550369b6e4c18e1.yaml
new file mode 100644
index 00000000000..ed06422ae8f
--- /dev/null
+++ b/releasenotes/notes/sriov_supports_accelerator_direct-e550369b6e4c18e1.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    Added support in SR-IOV agent for ``accelerator-direct`` VNIC
+    type. This type represents a port that supports any kind of
+    hardware acceleration and is provided by Cyborg
+    (https://wiki.openstack.org/wiki/Cyborg). `RFE: 1909100
+    <https://bugs.launchpad.net/neutron/+bug/1909100>`_.
+    ``accelerator-direct-physical`` is still not supported.