NdisTcpOffloadReceiveComplete function

An offload target calls the NdisTcpOffloadReceiveComplete function to return posted receive requests (receive buffers) to the host stack. The offload target previously received the receive requests in one or more calls to its MiniportTcpOffloadReceive function.

Syntax


VOID NdisTcpOffloadReceiveComplete(
  _In_ NDIS_HANDLE      NdisMiniportHandle,
  _In_ PNET_BUFFER_LIST NetBufferList
);

Parameters

NdisMiniportHandle [in]

The handle that the offload target obtained in a previous call to the NdisMRegisterMiniportDriver function.

NetBufferList [in]

A pointer to a NET_BUFFER_LIST structure. This structure can be stand-alone or the first structure in a linked list of NET_BUFFER_LIST structures. The offload target obtained these structures in one or more calls to its MiniportTcpOffloadReceive function.

Return value

None

Remarks

An offload target should use and return preposted receive requests in the order in which the requests were posted to the MiniportTcpOffloadReceive function of the offload target. That is, the offload target should use and return preposted receive requests in first in, first out (FIFO) order.

An offload target must serialize calls to the NdisTcpOffloadReceiveComplete function and to the NdisTcpOffloadReceiveHandler function on a per -connection basis.

An offload target's MiniportTcpOffloadReceive function can be called in the context of an offload target's call to the NdisTcpOffloadReceiveComplete function. In this case, an offload target must not call the NdisTcpOffloadReceiveComplete function again until the previous call to NdisTcpOffloadReceiveComplete has returned.

To improve system performance, an offload target can create a linked list that contains the NET_BUFFER_LIST structures from multiple calls to its MiniportTcpOffloadReceive function. The offload target can pass such a linked list in a single call to the NdisTcpOffloadReceiveComplete function. Note that, an offload target can distribute the receive requests that were posted in a single call to the MiniportTcpOffloadReceive function across more than one completion call as long the offload target completes the receive requests in the same order that they were posted to the MiniportTcpOffloadReceive function.

Before calling the NdisTcpOffloadReceiveComplete function, the offload target does the following for each NET_BUFFER_LIST structure that it passes to the function:

  • Writes one of the following status values to the Status member:

    NDIS_STATUS_SUCCESS

    The offload target received all the data associated with the NET_BUFFER_LIST structures that are referenced by the NetBufferList parameter. The offload target also advanced the RcvNxt and RcvWnd variables in the TCP delegated state for the TCP connection. The offload target might or might not have generated an acknowledgment for the received data, depending on whether the offload target is waiting to send a delayed acknowledgment.

    NDIS_STATUS_REQUEST_ABORTED

    An error occurred while the offload target was processing the received data. If the offload target is supplying some valid data with the NET_BUFFER_LIST structures that are pointed to by the NetBufferList parameter, the offload target specifies the number of valid data bytes by calling the NET_BUFFER_LIST_INFO macro. The offload target might or might not have acknowledged some portion of the received data.

    NDIS_STATUS_UPLOAD_IN_PROGRESS

    The connection on which the buffer was posted is being uploaded.

    NDIS_STATUS_INVALID_STATE

    The receive request was posted after the offload target indicated a disconnect by calling NdisTcpOffloadEventHandler.

  • Specifies the number of data bytes returned by calling the NET_BUFFER_LIST_INFO macro with an id of TcpOffloadBytesTransferred.

  • Calls the NdisAdvanceNetBufferDataStart function. The NetBufferList parameter should point to the NET_BUFFER structure that is associated with the NET_BUFFER_LIST structure. The DataOffsetDelta parameter should specify the number of data bytes that the offload target placed in the memory descriptor lists (MDLs) associated with the NET_BUFFER structure. The FreeMdl parameter should be NULL.

Requirements

Target platform

Desktop

Header

Ndischimney.h (include Ndischimney.h)

IRQL

Any level

See also

MiniportTcpOffloadReceive
NdisAdvanceNetBufferDataStart
NdisMRegisterMiniportDriver
NET_BUFFER
NET_BUFFER_LIST

 

 

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