NDK_FN_INVALIDATE - NtDoc
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// ndkpi.h
NDK_FN_INVALIDATE NdkFnInvalidate;
NTSTATUS NdkFnInvalidate(
[in] NDK_QP *pNdkQp,
[in, optional] PVOID RequestContext,
[in] NDK_OBJECT_HEADER *pNdkMrOrMw,
[in] ULONG Flags
)
{...}
View the official Windows Driver Kit DDI referenceNo description available.
The NdkInvalidate (NDK_FN_INVALIDATE) function Invalidates a fast-register NDK memory region (MR) or memory window (MW).
pNdkQp [in]A pointer to an NDK queue pair (QP) object (NDK_QP).
RequestContext [in, optional]A context value to return in the RequestContext member of the NDK_RESULT structure for this request.
pNdkMrOrMw [in]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.
Flags [in]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. |
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. |
NdkInvalidate invalidates an NDK fast-register MR or MW.
NDKPI Completion Handling Requirements
NDKPI Deferred Processing Scheme
NDKPI Work Request Posting Requirements