PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE callback function (ndis.h)

Article
10/21/2021

The ProtocolCoSendNetBufferListsComplete function completes a send operation that the protocol driver initiated with a call to the NdisCoSendNetBufferLists function.

Note You must declare the function by using the PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE type. For more information, see the following Examples section.

Syntax

PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE ProtocolCoSendNetBufferListsComplete;

void ProtocolCoSendNetBufferListsComplete(
  [in] NDIS_HANDLE ProtocolVcContext,
  [in] PNET_BUFFER_LIST NetBufferLists,
  [in] ULONG SendCompleteFlags
)
{...}

Parameters

[in] ProtocolVcContext

A handle to a protocol driver-allocated context area in which this driver maintains the per-virtual connection (VC) run-time state information. A client or stand-alone call manager supplied this handle either when it called the NdisCoCreateVc function or from its ProtocolCoCreateVc function.

[in] NetBufferLists

A pointer to a list of NET_BUFFER_LIST structures that the protocol driver supplied in a previous call to the NdisCoSendNetBufferLists function.

[in] SendCompleteFlags

NDIS flags that can be combined with a bitwise OR operation. To clear all of the flags, set this parameter to zero. ProtocolCoSendNetBufferListsComplete supports the NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL flag, which; if set, indicates that the current IRQL is DISPATCH_LEVEL. For more information about this flag, see Dispatch IRQL Tracking.

Return value

None

Remarks

The ProtocolCoSendNetBufferListsComplete function is required for CoNDIS protocol drivers. ProtocolCoSendNetBufferListsComplete performs whatever postprocessing is necessary to complete a send operation. For example, the protocol driver can notify the clients that requested the driver to send the network data that the send operation is complete.

NDIS calls ProtocolCoSendNetBufferListsComplete after the underlying miniport driver calls the NdisMCoSendNetBufferListsComplete function. A complete send operation does not necessarily imply that an underlying miniport driver has transmitted the specified network data. For example, a miniport driver can indicate that a send operation has completed as soon as it transfers the network data to the network interface card (NIC) hardware.

When NDIS calls ProtocolCoSendNetBufferListsComplete, the protocol driver regains ownership of all of the resources that are associated with the NET_BUFFER_LIST structures that the NetBufferLists parameter specifies.

NDIS always submits protocol driver-supplied network data to the underlying drivers in the protocol-determined order that was passed to NdisCoSendNetBufferLists. However, the underlying driver can complete the send requests in any order. That is, protocol drivers can rely on NDIS to submit network data in "first in, first out" (FIFO) order to the underlying driver. However, protocol drivers cannot rely on the underlying driver to call NdisMCoSendNetBufferListsComplete in the same order.

NDIS calls ProtocolCoSendNetBufferListsComplete at IRQL<= DISPATCH_LEVEL.

Examples

To define a ProtocolCoSendNetBufferListsComplete function, you must first provide a function declaration that identifies the type of function you're defining. Windows provides a set of function types for drivers. Declaring a function using the function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it's a requirement for writing drivers for the Windows operating system.

For example, to define a ProtocolCoSendNetBufferListsComplete function that is named "MyCoSendNetBufferListsComplete", use the PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE type as shown in this code example:

PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE MyCoSendNetBufferListsComplete;

Then, implement your function as follows:

_Use_decl_annotations_
VOID
 MyCoSendNetBufferListsComplete(
    NDIS_HANDLE  ProtocolVcContext,
    PNET_BUFFER_LIST  NetBufferLists,
    ULONG  SendCompleteFlags
    )
  {...}

The PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE function type is defined in the Ndis.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the Use_decl_annotations annotation to your function definition. The Use_decl_annotations annotation ensures that the annotations that are applied to the PROTOCOL_CO_SEND_NET_BUFFER_LISTS_COMPLETE function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for NDIS Drivers.

For information about Use_decl_annotations, see Annotating Function Behavior.

Requirements

Requirement	Value
Minimum supported client	Supported in NDIS 6.0 and later.
Target Platform	Windows
Header	ndis.h (include Ndis.h)
IRQL	<= DISPATCH_LEVEL