TPT-4456: Project RDMA Linode Interfaces (#736)

* TPT-4462: Support VPC RDMA Interfaces (#711)

* init

* add unit test

* lint

* nit`

* add explict reject

* fix firewall id

* TPT-4462: Add integration tests for RDMA interfaces (#713)

* init

* add unit test

* lint

* nit`

* Add integration tests for RDMA VPC and Subnet

* Update fixture and test assertions for RDMA VPC

* Create fixture for subnet RDMA

* Change rdma fixtures scope

---------

Co-authored-by: Ye Chen <yechen@akamai.com>

* Add test for RDMA Linode instance creation (#733)

* enable int test

* Fix formatting of vpc_type parameter in vpc.py

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* improve test

---------

Co-authored-by: Maciej Wilk <mawilk@akamai.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 3 people

linode_api4/groups/vpc.py

@@ -11,6 +11,7 @@
     VPCIPv6RangeOptions,
 )
 from linode_api4.objects.base import _flatten_request_body_recursive
+from linode_api4.objects.vpc import VPCType
 from linode_api4.paginated_list import PaginatedList
 from linode_api4.util import drop_null_keys
 
@@ -44,6 +45,7 @@ def create(
         subnets: Optional[List[Dict[str, Any]]] = None,
         ipv6: Optional[List[Union[VPCIPv6RangeOptions, Dict[str, Any]]]] = None,
         ipv4: Optional[List[Union[VPCIPv4RangeOptions, Dict[str, Any]]]] = None,
+        vpc_type: Optional[Union[VPCType, str]] = None,
         **kwargs,
     ) -> VPC:
         """
@@ -61,6 +63,11 @@ def create(
         :type subnets: List[Dict[str, Any]]
         :param ipv6: The IPv6 address ranges for this VPC.
         :type ipv6: List[Union[VPCIPv6RangeOptions, Dict[str, Any]]]
+        :param vpc_type: The type of VPC to create. Defaults to ``regular`` on
+                         the API side. Set to ``rdma`` to create a GPUDirect
+                         RDMA VPC (requires the ``GPUDirect RDMA`` account
+                         capability).
+        :type vpc_type: Optional[Union[VPCType, str]]
         :param ipv4: The IPv4 address ranges for this VPC. Note that IPv4 VPCs may not currently be available to all users.
         :type ipv4: List[Union[VPCIPv4RangeOptions, Dict[str, Any]]]
 
@@ -74,6 +81,7 @@ def create(
             "ipv4": ipv4,
             "ipv6": ipv6,
             "subnets": subnets,
+            "vpc_type": vpc_type,
         }
 
         if subnets is not None and len(subnets) > 0:

linode_api4/objects/linode.py

@@ -2115,10 +2115,22 @@ def interface_create(
         :param vpc: The VPC-specific configuration of the new interface.
                     If set, the new instance will be a VPC interface.
 
+        .. note::
+           RDMA VPC interfaces (``rdma_vpc``) cannot be added via this
+           endpoint. They may only be specified at instance creation time via
+           :func:`linode_api4.LinodeGroup.instance_create`.
+
         :returns: The newly created Linode Interface.
         :rtype: LinodeInterface
         """
 
+        if kwargs.get("rdma_vpc") is not None:
+            raise ValueError(
+                "RDMA VPC interfaces (rdma_vpc) cannot be added via "
+                "interface_create(). They may only be specified at instance "
+                "creation time via LinodeGroup.instance_create()."
+            )
+
         params = {
             "firewall_id": firewall,
             "default_route": default_route,

linode_api4/objects/linode_interfaces.py

@@ -187,6 +187,47 @@ class LinodeInterfaceVLANOptions(JSONObject):
     ipam_address: Optional[str] = None
 
 
+@dataclass
+class LinodeInterfaceRDMAVPCIPv4AddressOptions(JSONObject):
+    """
+    Options accepted for a single address when creating or updating the IPv4
+    configuration of an RDMA VPC Linode Interface.
+
+    Only one address is supported per RDMA VPC interface, and it must be
+    marked as primary.
+    """
+
+    address: Optional[str] = None
+    primary: Optional[bool] = None
+
+
+@dataclass
+class LinodeInterfaceRDMAVPCIPv4Options(JSONObject):
+    """
+    Options accepted when creating or updating the IPv4 configuration of an
+    RDMA VPC Linode Interface.
+
+    The ``addresses`` list MUST contain exactly one element. If omitted, the
+    API defaults to a single primary ``auto`` address.
+    """
+
+    addresses: Optional[List[LinodeInterfaceRDMAVPCIPv4AddressOptions]] = None
+
+
+@dataclass
+class LinodeInterfaceRDMAVPCOptions(JSONObject):
+    """
+    RDMA-VPC-exclusive options accepted when creating or updating a Linode
+    Interface.
+
+    Used for GPUDirect RDMA interfaces. Default routes and NAT 1:1 addresses
+    are not supported on RDMA VPC interfaces.
+    """
+
+    subnet_id: int = 0
+    ipv4: Optional[LinodeInterfaceRDMAVPCIPv4Options] = None
+
+
 @dataclass
 class LinodeInterfaceOptions(JSONObject):
     """
@@ -204,6 +245,7 @@ class LinodeInterfaceOptions(JSONObject):
     vpc: Optional[LinodeInterfaceVPCOptions] = None
     public: Optional[LinodeInterfacePublicOptions] = None
     vlan: Optional[LinodeInterfaceVLANOptions] = None
+    rdma_vpc: Optional[LinodeInterfaceRDMAVPCOptions] = None
 
 
 # Interface GET Response
@@ -409,6 +451,45 @@ class LinodeInterfaceVLAN(JSONObject):
     ipam_address: Optional[str] = None
 
 
+@dataclass
+class LinodeInterfaceRDMAVPCIPv4Address(JSONObject):
+    """
+    A single address under the IPv4 configuration of an RDMA VPC Linode Interface.
+    """
+
+    put_class = LinodeInterfaceRDMAVPCIPv4AddressOptions
+
+    address: str = ""
+    primary: bool = False
+
+
+@dataclass
+class LinodeInterfaceRDMAVPCIPv4(JSONObject):
+    """
+    The IPv4 configuration of an RDMA VPC Linode Interface.
+    """
+
+    put_class = LinodeInterfaceRDMAVPCIPv4Options
+
+    addresses: List[LinodeInterfaceRDMAVPCIPv4Address] = field(
+        default_factory=list
+    )
+
+
+@dataclass
+class LinodeInterfaceRDMAVPC(JSONObject):
+    """
+    RDMA VPC-specific configuration field for a Linode Interface.
+    """
+
+    put_class = LinodeInterfaceRDMAVPCOptions
+
+    vpc_id: int = 0
+    subnet_id: int = 0
+
+    ipv4: Optional[LinodeInterfaceRDMAVPCIPv4] = None
+
+
 class LinodeInterface(DerivedBase):
     """
     A Linode's network interface.
@@ -449,6 +530,7 @@ class LinodeInterface(DerivedBase):
         "public": Property(mutable=True, json_object=LinodeInterfacePublic),
         "vlan": Property(mutable=True, json_object=LinodeInterfaceVLAN),
         "vpc": Property(mutable=True, json_object=LinodeInterfaceVPC),
+        "rdma_vpc": Property(mutable=True, json_object=LinodeInterfaceRDMAVPC),
     }
 
     def firewalls(self, *filters) -> List[Firewall]:

linode_api4/objects/region.py

@@ -67,6 +67,7 @@ class Capability(StrEnum):
     ruleset = "Cloud Firewall Rule Set"
     prefixlists = "Cloud Firewall Prefix Lists"
     current_prefixlists = "Cloud Firewall Prefix List Current References"
+    gpudirect_rdma = "GPUDirect RDMA"
 
 
 @dataclass

linode_api4/objects/vpc.py

@@ -5,11 +5,20 @@
 from linode_api4.objects import Base, DerivedBase, Property, Region
 from linode_api4.objects.base import _flatten_request_body_recursive
 from linode_api4.objects.networking import VPCIPAddress
-from linode_api4.objects.serializable import JSONObject
+from linode_api4.objects.serializable import JSONObject, StrEnum
 from linode_api4.paginated_list import PaginatedList
 from linode_api4.util import drop_null_keys
 
 
+class VPCType(StrEnum):
+    """
+    VPCType represents the supported VPC types.
+    """
+
+    regular = "regular"
+    rdma = "rdma"
+
+
 @dataclass
 class VPCIPv4DefaultRange(JSONObject):
     """
@@ -119,6 +128,7 @@ class VPCSubnet(DerivedBase):
         "ipv6": Property(json_object=VPCSubnetIPv6Range, unordered=True),
         "linodes": Property(json_object=VPCSubnetLinode, unordered=True),
         "databases": Property(json_object=VPCSubnetDatabase, unordered=True),
+        "vpc_type": Property(),
         "created": Property(is_datetime=True),
         "updated": Property(is_datetime=True),
     }
@@ -144,6 +154,7 @@ class VPC(Base):
         ),
         "ipv6": Property(json_object=VPCIPv6Range, unordered=True),
         "subnets": Property(derived_class=VPCSubnet),
+        "vpc_type": Property(),
         "created": Property(is_datetime=True),
         "updated": Property(is_datetime=True),
     }

test/fixtures/linode_instances_124_interfaces_999.json

@@ -0,0 +1,27 @@
+{
+    "id": 999,
+    "mac_address": "22:00:f2:9e:d3:48",
+    "created": "2026-03-12T09:54:34",
+    "updated": "2026-03-12T09:54:35",
+    "default_route": {
+        "ipv4": false,
+        "ipv6": false
+    },
+    "version": 1,
+    "public": null,
+    "vpc": null,
+    "vlan": null,
+    "rdma_vpc": {
+        "vpc_id": 7,
+        "subnet_id": 8,
+        "ipv4": {
+            "addresses": [
+                {
+                    "address": "10.0.0.2",
+                    "primary": true
+                }
+            ]
+        }
+    }
+}
+

test/fixtures/vpcs.json

@@ -5,6 +5,7 @@
       "id": 123456,
       "description": "A very real VPC.",
       "region": "us-southeast",
+      "vpc_type": "regular",
       "ipv4": [
         {
           "range": "10.0.0.0/8"

test/fixtures/vpcs_123456.json

@@ -3,6 +3,7 @@
   "id": 123456,
   "description": "A very real VPC.",
   "region": "us-southeast",
+  "vpc_type": "regular",
   "ipv4": [
     {
       "range": "10.0.0.0/8"

test/fixtures/vpcs_123456_subnets.json

@@ -35,6 +35,7 @@
           ]
         }
       ],
+      "vpc_type": "regular",
       "created": "2018-01-01T00:01:01",
       "updated": "2018-01-01T00:01:01"
     }

test/fixtures/vpcs_123456_subnets_789.json

@@ -7,6 +7,7 @@
       "range": "fd71:1140:a9d0::/52"
     }
   ],
+  "vpc_type": "regular",
   "linodes": [
     {
       "id": 12345,