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317 lines
7.5 KiB
317 lines
7.5 KiB
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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send.c
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Abstract:
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NOTE: ZZZ There is a potential priority inversion problem when
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allocating the packet. For nt it looks like we need to raise
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the irql to dpc when we start the allocation.
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Author:
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Thomas J. Dimitri 8-May-1992
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Environment:
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Kernel Mode - Or whatever is the equivalent on OS/2 and DOS.
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Revision History:
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Ray Patch (raypa) 04/13/94 Modified for new WAN wrapper.
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--*/
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#if DBG
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#define __FILE_SIG__ 'dneS'
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#endif
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#include "asyncall.h"
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#include "globals.h"
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//
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// Forward references.
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//
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extern
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NTSTATUS
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AsyncWriteCompletionRoutine(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN PNDIS_WAN_PACKET WanPacket);
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//=============================================================================
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// Function:
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//
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// AsyncSend()
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//
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// Description:
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//
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// This function is the main entry point for transmitting data to the serial
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// driver. When entered, we get the MAC binding handle (a pointer to our
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// private data structure) and the WAN packet which we are going to send.
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// We don't bother queuing the frame, we simple allocate an IRP and ship
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// it to the serial driver and let him worry about it.
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//
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// In Parameters:
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//
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// NdisLinkContext - Pointer to the ASYNC_INFO structure.
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//
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// Packet - WAN packet containing the data to be framed and shipped.
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//
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// Out Parameters:
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//
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// None.
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//
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// Return status:
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//
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// NDIS_STATUS_SUCCESS.
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//=============================================================================
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NDIS_STATUS
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MpSend(
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IN NDIS_HANDLE MacBindingHandle,
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IN NDIS_HANDLE NdisLinkHandle,
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IN PNDIS_WAN_PACKET Packet)
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{
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PASYNC_INFO AsyncInfo;
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NDIS_STATUS Status;
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DbgTracef(1,("AS\n"));
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//
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// Get the open handle for this MAC binding.
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//
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AsyncInfo = (PASYNC_INFO) NdisLinkHandle;
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//
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// First make sure this link is still up.
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//
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if (AsyncInfo->PortState == PORT_FRAMING &&
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(AsyncInfo->GetLinkInfo.SendFramingBits &
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(PPP_FRAMING | SLIP_FRAMING)) != 0)
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{
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//
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// Now we can send this frame.
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//
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Status = AsyncSendPacket(
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NdisLinkHandle,
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Packet);
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// For all Status values (PENDING, SUCCESS, and ERROR) the callback from Write will
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// do a sendcomplete indication so we always return PENDING.
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//
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Status = STATUS_PENDING ;
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}
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else
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{
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DbgTracef(-2,("AsyncSend: Link not found, dropping packet!\n"));
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Status = NDIS_STATUS_SUCCESS;
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}
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return Status;
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}
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//=============================================================================
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// Function:
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//
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// AsyncSendPacket()
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//
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// Description:
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// This function is called from AsyncSend() to send an IRP to the serial
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// driver. If this IRP pends, the the I/O complete routine will be called
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// later to complete the request.
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//
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// In Parameters:
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//
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// Packet - WAN packet containing the data to be framed and shipped.
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//
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// Out Parameters:
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//
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// None.
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//
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// Return status:
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//
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// NDIS_STATUS_SUCCESS.
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//=============================================================================
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NTSTATUS
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AsyncSendPacket(
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IN PASYNC_INFO AsyncInfo,
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IN PNDIS_WAN_PACKET WanPacket)
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{
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NTSTATUS Status;
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PIRP irp;
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PIO_STACK_LOCATION irpSp;
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PFILE_OBJECT FileObject;
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PDEVICE_OBJECT DeviceObject;
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PASYNC_ADAPTER Adapter;
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UCHAR irpStackSize;
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//
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// Initialize locals.
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//
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FileObject = AsyncInfo->FileObject;
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DeviceObject = AsyncInfo->DeviceObject;
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Adapter = AsyncInfo->Adapter;
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irpStackSize = (UCHAR) Adapter->IrpStackSize;
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//
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// Get irp from irp pool.
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//
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irp = IoAllocateIrp(DeviceObject->StackSize, (BOOLEAN)FALSE);
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//
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// The IO subsystem may be out of irps.
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//
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if (irp == NULL) {
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return(NDIS_STATUS_RESOURCES);
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}
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//
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// Tuck pointer to AsyncInfo for completion use
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//
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WanPacket->MacReserved1 = AsyncInfo;
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irp->Tail.Overlay.OriginalFileObject = FileObject;
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irp->RequestorMode = KernelMode;
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irp->PendingReturned = FALSE;
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//
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// Fill in the service independent parameters in the IRP.
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//
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irp->UserEvent = NULL;
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//
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// 8 byte align (also use end of packet for IOSB).
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//
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irp->Overlay.AsynchronousParameters.UserApcRoutine = NULL;
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irp->Overlay.AsynchronousParameters.UserApcContext = NULL;
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//
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// Get a pointer to the stack location for the first driver. This will be
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// used to pass the original function codes and parameters.
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//
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irpSp = IoGetNextIrpStackLocation(irp);
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irpSp->MajorFunction = IRP_MJ_WRITE;
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irpSp->FileObject = FileObject;
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if (FileObject->Flags & FO_WRITE_THROUGH) {
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irpSp->Flags = SL_WRITE_THROUGH;
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}
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//
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// If this write operation is to be performed without any caching, set the
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// appropriate flag in the IRP so no caching is performed.
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//
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if (FileObject->Flags & FO_NO_INTERMEDIATE_BUFFERING) {
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irp->Flags |= (IRP_NOCACHE | IRP_WRITE_OPERATION);
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} else {
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irp->Flags |= IRP_WRITE_OPERATION;
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}
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//
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// Assemble a RAS, PPP, SLIP frame type.
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//
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if (AsyncInfo->GetLinkInfo.SendFramingBits & PPP_FRAMING) {
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AssemblePPPFrame(WanPacket);
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} else
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if (AsyncInfo->GetLinkInfo.SendFramingBits & SLIP_FRAMING) {
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AssembleSLIPFrame(WanPacket);
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}
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irp->AssociatedIrp.SystemBuffer =
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WanPacket->CurrentBuffer;
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DbgTracef(0, ("Writing out %.2x %.2x %.2x %.2x %.2x\n",
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WanPacket->CurrentBuffer[0],
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WanPacket->CurrentBuffer[1],
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WanPacket->CurrentBuffer[2],
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WanPacket->CurrentBuffer[3],
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WanPacket->CurrentBuffer[4]));
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//
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// Copy the caller's parameters to the service-specific portion of the IRP.
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//
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irpSp->Parameters.Write.Length = WanPacket->CurrentLength;
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irpSp->Parameters.Write.Key = 0;
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irpSp->Parameters.Write.ByteOffset = FileObject->CurrentByteOffset;
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//
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// Setup IRP for callback.
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//
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IoSetCompletionRoutine(
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irp, // irp to use
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AsyncWriteCompletionRoutine, // routine to call when irp is done
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WanPacket, // context to pass routine
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TRUE, // call on success
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TRUE, // call on error
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TRUE); // call on cancel
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//
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// We DO NOT insert the packet at the head of the IRP list for the thread.
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// because we do NOT really have an IoCompletionRoutine that does
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// anything with the thread or needs to be in that thread's context.
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//
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GlobalXmitWentOut++;
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AsyncInfo->In++;
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AsyncInfo->Flags |= ASYNC_FLAG_SEND_PACKET;
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REF_ASYNCINFO(AsyncInfo, irp);
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//
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// Now simply invoke the driver at its dispatch entry with the IRP.
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//
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Status = IoCallDriver(DeviceObject, irp);
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// According to TonyE, the status for the serial driver should
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// always be STATUS_PENDING. DigiBoard usually STATUS_SUCCESS.
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return Status;
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}
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