NDIS_QOS_CAPABILITIES - NtDoc
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// ntddndis.h
typedef struct _NDIS_QOS_CAPABILITIES {
NDIS_OBJECT_HEADER Header;
ULONG Flags;
ULONG MaxNumTrafficClasses;
ULONG MaxNumEtsCapableTrafficClasses;
ULONG MaxNumPfcEnabledTrafficClasses;
} NDIS_QOS_CAPABILITIES, *PNDIS_QOS_CAPABILITIES;
View the official Windows Driver Kit DDI referenceNo description available.
The NDIS_QOS_CAPABILITIES structure specifies the NDIS Quality of Service (QoS) capabilities of a network adapter that supports the IEEE 802.1 Data Center Bridging (DCB) interface.
HeaderThe type, revision, and size of the NDIS_QOS_CAPABILITIES structure. This member is formatted as an NDIS_OBJECT_HEADER structure.
The miniport driver must set the Type member of Header to NDIS_OBJECT_TYPE_QOS_CAPABILITIES. To specify the version of the NDIS_QOS_CAPABILITIES structure, the driver must set the Revision member of Header to the following value:
Original version for NDIS 6.30 and later.
Set the Size member to NDIS_SIZEOF_QOS_CAPABILITIES_REVISION_1.
FlagsA ULONG value that contains a bitwise OR of flags that specify the NDIS QoS capabilities that a network adapter supports. The following flags are defined:
If this flag is set, the network adapter supports the strict priority transmission selection algorithm (TSA). For more information about this algorithm, see Strict Priority Algorithm.
Note In order to be compliant with DCB, the network adapter must support the strict priority TSA.
If this flag is set, the network adapter supports the ability to bypass media access control security (MACsec) processing. For more information about MACsec, refer to the 802.1AE-2006 standard.
If this flag is set, the network adapter and miniport driver supports the protocols that pre-date the IEEE 802.1Qaz Data Center Bridging Exchange (DCBX) protocol. These protocols include the Converged Enhanced Ethernet (CEE) suite of protocols.
If this flag is set, the network adapter and miniport driver supports the IEEE 802.1Qaz DCBX protocol. The DCBX protocol allows DCB parameters to be exchanged between two directly connected peers. This allows these peers to adapt and tune these parameters in order to optimize data transfer over the connection. For more information about this protocol, see Overview of Data Center Bridging.
Note If this flag is set, the miniport driver must reject any send requests for DCBX packets.
MaxNumTrafficClassesA ULONG value that specifies the maximum number of NDIS QoS traffic classes that the network adapter supports. For more information, see NDIS QoS Traffic Classes.
Note In order for the network adapter to support NDIS QoS for DCB, it must support at least three traffic classes.
MaxNumEtsCapableTrafficClassesA ULONG value that specifies the maximum number of QoS traffic classes that the network adapter can use with the Enhanced Transmission Selection (ETS) algorithm. This value must be less than or equal to the value of the MaxNumTrafficClasses member.
For more information about ETS, see Enhanced Transmission Selection (ETS) Algorithm.
Note In order for the network adapter to support NDIS QoS for DCB, it must support at least two ETS-capable traffic classes.
MaxNumPfcEnabledTrafficClassesA ULONG value that specifies the maximum number of QoS traffic classes that the network adapter can use with the Priority-based Flow Control (PFC) algorithm. This value must be less than or equal to the value of the MaxNumTrafficClasses member.
For more information about PFC, see Priority-based Flow Control (PFC).
Note In order for the network adapter to support NDIS QoS for DCB, it must support at least one PFC-capable traffic class.
The miniport driver registers the NDIS QoS capabilities of the underlying network adapter from the driver's MiniportInitializeEx function by following these steps:
The NDIS_QOS_CAPABILITIES structure is also returned in OID query requests of OID_QOS_CURRENT_CAPABILITIES and OID_QOS_HARDWARE_CAPABILITIES.
NDIS_MINIPORT_ADAPTER_HARDWARE_ASSIST_ATTRIBUTES