SRIOV_READ_CONFIG - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// pcivirt.h

SRIOV_READ_CONFIG SriovReadConfig;

NTSTATUS SriovReadConfig(
  [in]  PVOID Context,
  [out] PVOID Data,
  [in]  USHORT VfIndex,
  [in]  ULONG Offset,
  [in]  ULONG Length
)
{...}
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Windows Driver Kit DDI reference (nc-pcivirt-sriov_read_config)

SRIOV_READ_CONFIG callback

Description

Reads data from the configuration space of the specified PCI Express SR-IOV Virtual Function (VF).

Parameters

Context [in]

A pointer to a driver-defined context.

Data [out]

A pointer to buffer that contains the configuration information to be read from the VF's configuration space.

VfIndex [in]

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

Offset [in]

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

Length [in]

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

Return value

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

Prototype

NTSTATUS  SRIOV_READ_CONFIG(
  _In_        PVOID  Context,
  _Out_ const VOID   *Data,
  _In_        USHORT VfIndex,
  _In_        ULONG  Offset,
  _In_        ULONG  Length
);

typedef SRIOV_READ_CONFIG *PSRIOV_READ_CONFIG;

Remarks

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

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

View the official Windows Driver Kit DDI reference

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