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Resetting a DMA Channel

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Note  The NetDMA interface is not supported in Windows 8 and later.

The NetDMA interface calls the NetDMA provider driver's ProviderResetChannel function, if any, to reset a dynamic memory access (DMA) channel.

In ProviderResetChannel, the NetDMA provider should terminate any active transfer immediately without completing the transfer of the data that is associated with the current DMA descriptor. If completion status reporting is enabled, the DMA engine writes the NetDmaTransferStatusHalted status in the address that is specified in the CompletionVirtualAddress and CompletionPhysicalAddress members in the NET_DMA_CHANNEL_PARAMETERS structure.

Before the reset operation is complete, the NetDMA provider must set the DMA channel to the initial state that existed after the channel was allocated. After the NetDMA interface calls ProviderResetChannel, the NetDMA provider cannot access any of the previously submitted DMA descriptors. The DMA channel must be ready for the NetDMA interface to call the ProviderStartDma function.