NET_DMA_PROVIDER_ATTRIBUTES structure (netdma.h)
Syntax
typedef struct _NET_DMA_PROVIDER_ATTRIBUTES {
UCHAR MajorHwVersion;
UCHAR MinorHwVersion;
USHORT Size;
ULONG Flags;
ULONG VendorId;
ULONG DmaChannelCount;
ULONG MaximumTransferSize;
PHYSICAL_ADDRESS MaximumAddressSpace;
} NET_DMA_PROVIDER_ATTRIBUTES, *PNET_DMA_PROVIDER_ATTRIBUTES;
Members
MajorHwVersion
The major version number of the DMA provider hardware.
MinorHwVersion
The minor version number of the DMA provider hardware.
Size
The size, in bytes, of this NET_DMA_PROVIDER_ATTRIBUTES structure. Set this member to sizeof(NET_DMA_PROVIDER_ATTRIBUTES).
Flags
Reserved for DMA provider attributes flags. Set this member to zero.
VendorId
A vendor identifier (ID) that uniquely identifies the vendor that created the DMA engine. This vendor ID is specified in the device's PCI configuration space. For more information about the vendor ID, see Identifiers for PCI Devices.
DmaChannelCount
The number of DMA channels that the DMA provider supports. This number can differ from the MaxDmaChannelCount member of the NET_DMA_PROVIDER_CHARACTERISTICS structure that defines the maximum number of DMA channels that this type of DMA provider can support.
MaximumTransferSize
The maximum DMA transfer size, in bytes, that the DMA provider can support. This value can must be 4 KB or greater.
MaximumAddressSpace
The largest physical address that the DMA engine can support.
Remarks
To start a DMA provider, the DMA provider driver supplies a NET_DMA_PROVIDER_ATTRIBUTES structure at the ProviderAttributes parameter of the NetDmaProviderStart function.
A DMA provider driver initializes a DMA engine and starts a DMA provider while handling the IRP_MN_START_DEVICE IRP.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Supported for NetDMA 2.0 drivers in Windows Server 2008. Supported for NetDMA 1.1 drivers in Windows Server 2008. Supported for NetDMA 1.0 drivers in Windows Server 2008 and Windows Vista. |
| Header | netdma.h (include Netdma.h) |