SRIOV_WRITE_CONFIG callback

Description

Writes configuration data to a PCI Express SR-IOV Virtual Function (VF).

Parameters

Context [in]

A pointer to a driver-defined context.

Data [in]

A pointer to buffer that contains the data to be written to the configuration space.

VfIndex [in]

A zero-based index of the VF to which this write operation applies.

Offset [in]

An offset in bytes to the start of the VF’s configuration space where the write begins.

Length [in]

The length, in bytes, of the data to write to the configuration space.

Return value

Return STATUS_SUCCESS if the operation succeeds. Otherwise, return an appropriate NTSTATUS error code.

Prototype

SRIOV_WRITE_CONFIG SriovWriteConfig;

NTSTATUS SriovWriteConfig(
  _In_       PVOID  Context,
  _In_ const VOID   *Data,
  _In_       USHORT VfIndex,
  _In_       ULONG  Offset,
  _In_       ULONG  Length
)
{ ... }

typedef SRIOV_WRITE_CONFIG *PSRIOV_WRITE_CONFIG;

Remarks

This callback function is implemented by the physical function (PF) driver. It is invoked when the system wants to write to the configuration space of a specific virtual function.

The PF driver registers its implementation by setting the WriteVfConfig member of the SRIOV_DEVICE_INTERFACE_STANDARD, configuring a WDF_QUERY_INTERFACE_CONFIG structure, and calling WdfDeviceAddQueryInterface.