NDK_FN_INVALIDATE callback function (ndkpi.h)

Article
10/21/2021

The NdkInvalidate (NDK_FN_INVALIDATE) function Invalidates a fast-register NDK memory region (MR) or memory window (MW).

Syntax

NDK_FN_INVALIDATE NdkFnInvalidate;

NTSTATUS NdkFnInvalidate(
  [in]           NDK_QP *pNdkQp,
  [in, optional] PVOID RequestContext,
  [in]           NDK_OBJECT_HEADER *pNdkMrOrMw,
  [in]           ULONG Flags
)
{...}

Parameters

[in] pNdkQp

A pointer to an NDK queue pair (QP) object (NDK_QP).

[in, optional] RequestContext

A context value to return in the RequestContext member of the NDK_RESULT structure for this request.

[in] pNdkMrOrMw

A pointer to either an memory region (MR) object (NDK_MR) or an memory (MW) object (NDK_MW) that is specified in an NDK_OBJECT_HEADER structure. If an MR object is specified, the MR object must have been registered with the NdkFastRegister (NDK_FN_FAST_REGISTER) function. The NDK consumer must never specify an MR object that was registered with the NdkRegister (NDK_FN_REGISTER) function in the pNdkMrOrMw parameter. Access to MR objects registered with the NdkRegister (NDK_FN_REGISTER)) function can be removed with the NdkDeregisterMr (NDK_FN_DEREGISTER_MR) function.

[in] Flags

A bitwise OR of flags which specifies the operations that are allowed. The following flags are supported:

Value	Meaning
NDK_OP_FLAG_SILENT_SUCCESS 0x00000001	Indicates the successful completion of this request does not generate a completion event in the outbound completion queue. However, requests that fail do generate an event in the completion queue.
NDK_OP_FLAG_READ_FENCE 0x00000002	Indicates that all prior read requests must be complete before the hardware begins processing this request.
NDK_OP_FLAG_DEFER 0x00000200	Indicates to the NDK provider that it may defer indicating the request to hardware for processing. For more information about this flag, see NDKPI Deferred Processing Scheme. Note This flag is supported only in NDKPI 1.2 (Windows Server 2012 R2) and later.

Return value

The
NdkInvalidate function returns one of the following NTSTATUS codes.

Return code	Description
STATUS_SUCCESS	The request was posted successfully. A completion entry will be queued to the CQ when the work request is completed.
STATUS_CONNECTION_INVALID	The QP is not connected.
Other status codes	An error occurred.

Remarks

NdkInvalidate invalidates an NDK fast-register MR or MW.

Requirements

Requirement	Value
Minimum supported client	None supported,Supported in NDIS 6.30 and later.
Minimum supported server	Windows Server 2012
Target Platform	Windows
Header	ndkpi.h (include Ndkpi.h)
IRQL	<=DISPATCH_LEVEL