NDK_FN_FAST_REGISTER callback function (ndkpi.h)

The NdkFastRegister (NDK_FN_FAST_REGISTER) function fast-registers an array of adapter logical pages over an existing memory region.

Syntax

NDK_FN_FAST_REGISTER NdkFnFastRegister;

NTSTATUS NdkFnFastRegister(
  [in]           NDK_QP *pNdkQp,
  [in, optional] PVOID RequestContext,
  [in]           NDK_MR *pMr,
  [in]           ULONG AdapterPageCount,
                 const NDK_LOGICAL_ADDRESS *AdapterPageArray,
  [in]           ULONG FBO,
  [in]           SIZE_T Length,
  [in]           PVOID BaseVirtualAddress,
  [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] pMr

A pointer to an NDK memory region (MR) object (NDK_MR) that was initialized for fast registration.

[in] AdapterPageCount

The number of pages in the AdapterPageArray parameter. The size of each page in the AdapterPageArray is PAGE_SIZE bytes.

AdapterPageArray

An array of adapter logical addresses (NDK_LOGICAL_ADDRESS) where each address is the starting logical address for a page. Each address must be aligned pages that are PAGE_SIZE bytes in length. Consecutive addresses in the array are not necessarily consecutive in terms of the logical address space, but the array as a whole represents a virtually contiguous memory region from the perspective of the host system.

[in] FBO

The first byte offset (FBO) within the first page. The registered region starts at this offset.

[in] Length

The length, in bytes, of the region being registered starting at the FBO. The length must be less than or equal to the total number of bytes that are represented by the first set (AdapterPageCount) of pages that are contained in the AdapterPageArray array minus the FBO.

[in] BaseVirtualAddress

The consumer-specified virtual address value to refer to the first byte location of the memory region. This value must be a multiple of PAGE_SIZE plus FBO. So, the allowed values include FBO, or FBO plus n times the PAGE_SIZE where n is greater than or equal to zero. Zero is a valid value only if FBO is zero.

[in] Flags

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

Return value

The NDK_FN_FAST_REGISTER function returns one of the following NTSTATUS codes.

Remarks

NdkFastRegister fast-registers an array of adapter logical pages over an existing memory region that is initialized for fast registration.

After this call returns, the memory region token for remote access is available with the NdkGetRemoteTokenFromMr (NDK_FN_GET_REMOTE_TOKEN_FROM_MR) function of the MR.

NdkFastRegister does not support zero-based virtual addresses.

If the NDK_ADAPTER_FLAG_RDMA_READ_SINK_NOT_REQUIRED flag is not set in the AdapterFlags member of the NDK_ADAPTER_INFO structure, an NDK consumer must pass the NDK_OP_FLAG_RDMA_READ_SINK flag when it registers memory that might be used as the sink buffer for an RDMA read request. Certain NDK providers might require the enabling of special access rights on the sink buffer for an RDMA read request. This flag allows such providers to support registration requests appropriately. Note that buffers might be registered for multiple purposes, therefore this flag might be accompanied by others.

If an NDK consumer passes the NDK_OP_FLAG_RDMA_READ_SINK flag on an adapter for which the NDK_ADAPTER_FLAG_RDMA_READ_SINK_NOT_REQUIRED flag is set in the AdapterFlags member of the NDK_ADAPTER_INFO structure, the provider is not required to handle the NDK_OP_FLAG_RDMA_READ_SINK flag and must not fail the request due to the presence of this flag.

Requirements

See also

NDKPI Deferred Processing Scheme

NDKPI Work Request Posting Requirements

NDK_ADAPTER_INFO

NDK_FN_GET_REMOTE_TOKEN_FROM_MR

NDK_LOGICAL_ADDRESS

NDK_MR

NDK_QP

NDK_RESULT