USBD_ENDPOINT_OFFLOAD_INFORMATION_V1 structure (usb.h)

Stores xHCI-specific V1 information that is used by client drivers to transfer data to and from the offloaded endpoints.

Syntax

typedef struct _USBD_ENDPOINT_OFFLOAD_INFORMATION_V1 {
  ULONG                      Size;
  USHORT                     EndpointAddress;
  ULONG                      ResourceId;
  USBD_ENDPOINT_OFFLOAD_MODE Mode;
  ULONG                      RootHubPortNumber : 8;
  ULONG                      RouteString : 20;
  ULONG                      Speed : 4;
  ULONG                      UsbDeviceAddress : 8;
  ULONG                      SlotId : 8;
  ULONG                      MultiTT : 1;
  ULONG                      LSOrFSDeviceConnectedToTTHub : 1;
  ULONG                      Reserved0 : 14;
  PHYSICAL_ADDRESS           TransferSegmentLA;
  PVOID                      TransferSegmentVA;
  size_t                     TransferRingSize;
  ULONG                      TransferRingInitialCycleBit;
  ULONG                      MessageNumber;
  PHYSICAL_ADDRESS           EventRingSegmentLA;
  PVOID                      EventRingSegmentVA;
  size_t                     EventRingSize;
  ULONG                      EventRingInitialCycleBit;
} USBD_ENDPOINT_OFFLOAD_INFORMATION_V1, *PUSBD_ENDPOINT_OFFLOAD_INFORMATION_V1;

Members

Size

The size of this structure.

EndpointAddress

Specifies the USB-defined endpoint address.

ResourceId

The resource identifier.

Mode

A USBD_ENDPOINT_OFFLOAD_MODE value that indicates whether endpoint offloading is handled in software or the USB device or host controller.

RootHubPortNumber

The port number of the root hub to which the device is connected.

RouteString

The route string describing the path from the root hub to the device.

Speed

The speed of the USB device.

UsbDeviceAddress

The USB address of the device.

SlotId

The slot ID of the device.

MultiTT

Indicates if the device is connected to a hub with transaction translators.

LSOrFSDeviceConnectedToTTHub

Indicates if the device is a low-speed or full-speed device connected to a hub with transaction translators.

Reserved0

Reserved.

TransferSegmentLA

The physical address of the transfer ring segment.

TransferSegmentVA

The virtual address of the transfer ring segment.

TransferRingSize

The size of the transfer ring.

TransferRingInitialCycleBit

The initial cycle bit of the transfer ring.

MessageNumber

The message number for the secondary event ring.

EventRingSegmentLA

The physical address of the event ring segment.

EventRingSegmentVA

The virtual address of the event ring segment.

EventRingSize

The size of the event ring, in bytes.

EventRingInitialCycleBit

The initial cycle bit of the event ring.

see-also

• USBD_ENDPOINT_OFFLOAD_INFORMATION

Requirements