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NdisMGetDmaAlignment function (ndis.h)
The NdisMGetDmaAlignment function returns the alignment requirements of the DMA system for a NIC.
Syntax
ULONG NdisMGetDmaAlignment(
[in] NDIS_HANDLE MiniportAdapterHandle
);
Parameters
[in] MiniportAdapterHandle
An NDIS handle that identifies the miniport adapter for the NIC. This handle was originally passed to the MiniportInitializeEx function.
Return value
Returns a value that specifies the alignment requirements of the DMA system. The miniport driver uses this value to round up the size of a receive buffer to a cache-line size or a multiple of that size when it allocates such a buffer.
Remarks
Note A miniport driver must have already called NdisMRegisterScatterGatherDma or NdisMRegisterDmaChannel to initialize a
scatter/gather DMA channel before calling NdisMGetDmaAlignment.
A miniport driver can call the
NdisMGetDmaAlignment function to determine alignment requirements for DMA buffers that it
allocates. A miniport driver might require increasing the returned value because of additional hardware
device restrictions.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Supported in NDIS 6.0 and later. |
| Target Platform | Universal |
| Header | ndis.h (include Ndis.h) |
| Library | Ndis.lib |
| IRQL | = PASSIVE_LEVEL |
| DDI compliance rules | Irql_Miniport_Driver_Function(ndis) |
See also
NdisMRegisterScatterGatherDmaFeedback
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