NDIS_PD_CAPABILITIES structure (ntddndis.h)

This structure indicates the PD capabilities for a provider.

Syntax

typedef struct _NDIS_PD_CAPABILITIES {
  NDIS_OBJECT_HEADER Header;
  ULONG              Flags;
  ULONG              MaximumTxPartialBufferCount;
  ULONG              MaximumRxPartialBufferCount;
  UCHAR              RxFilterContextWidth;
  ULONG              CapabilityFlags;
  ULONG              MaxNumberOfRxQueues;
  ULONG              MaxNumberOfTxQueues;
  ULONG              MaxNumberOfRxQueuesForDefaultVport;
  ULONG              MaxNumberOfTxQueuesForDefaultVport;
  ULONG              MaxNumberOfRxQueuesPerNonDefaultVport;
  ULONG              MaxNumberOfTxQueuesPerNonDefaultVport;
  ULONG              ExactMatchProfileArrayOffset;
  ULONG              ExactMatchProfileArrayNumElements;
  ULONG              ExactMatchProfileArrayElementSize;
  ULONG              WildcardMatchProfileArrayOffset;
  ULONG              WildcardMatchProfileArrayNumElements;
  ULONG              WildcardMatchProfileArrayElementSize;
  ULONG              MinimumModerationInterval;
  ULONG              MaximumModerationInterval;
  ULONG              ModerationIntervalGranularity;
  ULONG              MaxRxQueueSize;
  ULONG              MaxTxQueueSize;
} NDIS_PD_CAPABILITIES;

Members

Header

The NDIS_OBJECT_HEADER structure for the NDIS_PD_CAPABILITIES structure. Set the members of this structure as follows:

• Type = NDIS_OBJECT_TYPE_DEFAULT
• Revision = NDIS_PD_CAPABILITIES_REVISION_1
• Size = NDIS_SIZEOF_PD_CAPABILITIES_REVISION_1

Flags

This member is reserved and must be set to 0.

MaximumTxPartialBufferCount

The maximum partial transmit PD_BUFFER chain lengths supported by the provider.

MaximumRxPartialBufferCount

The maximum partial receive PD_BUFFER chain lengths supported by the provider.

RxFilterContextWidth

The filter context width that the provider supports. A provider can support up to 64-bits in width.

CapabilityFlags

Flags that contain additional capabilities that the provider supports.

Flag	Description
NDIS_PD_CAPS_RECEIVE_FILTER_COUNTERS_SUPPORTED	This flag indicates that the provider supports creation of counters with the PDCounterTypeReceiveFilter type that is part of the NDIS_PD_COUNTER enumeration

MaxNumberOfRxQueues

The maximum number of receive queues the provider supports. This is only relevant to queues created by the NdisPDAllocateQueue routine, therefore this number is not accurate for the client because additional pre-existing RSS queues (that the client can request PD-mode access to using the NdisPDOnRssReceiveQueues) are not accounted for in the NdisPDAllocateQueue routine.

It is possible for providers to set this value to 0, if it only supports clients to put pre-existing RSS queues into PD-mode using the NdisPDOnRssReceiveQueues routine.

MaxNumberOfTxQueues

The maximum number of transmit queues the provider can create using the NdisPDAllocateQueue routine. The provider must not set this value to 0.

MaxNumberOfRxQueuesForDefaultVport

The maximum number of receive queues that the provider supports for the default virtual port.

MaxNumberOfTxQueuesForDefaultVport

The maximum number of transmit queues that the provider supports for the default virtual port.

MaxNumberOfRxQueuesPerNonDefaultVport

The maximum number of receive queues that the provider supports for non-default virtual ports.

MaxNumberOfTxQueuesPerNonDefaultVport

The maximum number of transmit queues that the provider supports for non-default virtual ports.

ExactMatchProfileArrayOffset

The array offset for an array of NDIS_GFP_EXACT_MATCH_PROFILE structures.

ExactMatchProfileArrayNumElements

The number of elements for an array of NDIS_GFP_EXACT_MATCH_PROFILE structures.

ExactMatchProfileArrayElementSize

The number of elements for an array of NDIS_GFP_EXACT_MATCH_PROFILE structures.

WildcardMatchProfileArrayOffset

The array offset for an array of NDIS_GFP_WILDCARD_MATCH_PROFILE structures.

WildcardMatchProfileArrayNumElements

The number of elements for an array of NDIS_GFP_WILDCARD_MATCH_PROFILE structures.

WildcardMatchProfileArrayElementSize

The number of elements for an array of NDIS_GFP_WILDCARD_MATCH_PROFILE structures.

MinimumModerationInterval

MaximumModerationInterval

ModerationIntervalGranularity

MaxRxQueueSize

MaxTxQueueSize

Remarks

This structure must be aligned on an 8-byte boundary.

If the provider has a flexible implementation where it supports a maximum number of N queues, where any queue can be purposed flexibly as either an Rx or Tx queue, the provider should advertise ~N/2 for the MaxNumberOfRxQueues and MaxNumberOfTxQueues values because clients typically create a matching number of Rx and Tx queues.

If a provider can partition Rx or Tx queues flexibly between virtual ports then is can use NDIS_PD_QUEUE_COUNT_DYNAMIC for the virtual port specific max counts.

Requirements

Requirement	Value
Minimum supported client	Windows 10
Minimum supported server	Windows Server 2016
Header	ntddndis.h (include Ndis.h)

See also

NDIS_OBJECT_HEADER