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Handling an MSI Interrupt

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NDIS calls the MiniportMessageInterrupt function when a network interface card (NIC) generates an interrupt. The MessageId parameter in this function identifies the MSI-X message.

MiniportMessageInterrupt should always return TRUE after processing the interrupt because message interrupts are not shared.

A miniport driver should do as little work as possible in its MiniportMessageInterrupt function. The driver should defer I/O operations to the MiniportMessageInterruptDpc function, which NDIS calls to complete the deferred processing of an interrupt.

To queue additional deferred procedure calls (DPCs) after MiniportMessageInterrupt returns, the miniport driver sets the bits of the TargetProcessors parameter of the MiniportMessageInterrupt function. To request additional DPCs from MiniportMessageInterrupt or MiniportMessageInterruptDPC, the miniport driver can call the NdisMQueueDpc function.

The miniport driver can call NdisMQueueDpc to request additional DPCs for other processors.

NDIS 6.1 and later versions guarantees that DPCs for different messages that are scheduled for the same CPU are queued separately. For example, if a miniport driver schedules two DPCs at the same time on CPU 1 (one DPC for message 0 and the other DPC for message 1), two DPCs are queued for CPU 1 (one DPC with message 0 and the other DPC with message 1).

NDIS also guarantees that DPCs for the same message that are scheduled on different CPUs are queued separately. For example, if a miniport driver schedules two DPCs (one DPC on CPU 0 for message 0 and one DPC on CPU 1 for message 0), two separate DPCs are queued on CPU 0 and CPU 1, both for message 0.