/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
ltloop.c
Abstract:
This module contains the loopback queue processing routines.
Author:
Stephen Hou (stephh@microsoft.com)
Nikhil Kamkolkar (nikhilk@microsoft.com)
Revision History:
19 Jun 1992 Initial Version (dch@pacvax.pacersoft.com)
Notes: Tab stop: 4
--*/
#include "ltmain.h"
// Define file id for errorlogging
#define FILENUM LTLOOP
VOID
LtLoopProcessQueue(
IN PLT_ADAPTER Adapter
)
/*++
Routine Description:
This routine is responsible for indicating *one* packet on
the loopback queue either completing it or moving on to the
finish send queue.
Arguments:
Adapter - The adapter whose loopback queue we are processing.
Return Value:
None.
--*/
{
// Packet at the head of the loopback list.
PNDIS_PACKET Packet;
// The reserved portion of the above packet.
PLT_PACKET_RESERVED Reserved;
// Buffer for loopback.
CHAR Loopback[LT_MAX_INDICATE_SIZE];
// The first buffer in the ndis packet to be loopedback.
PNDIS_BUFFER FirstBuffer;
// The total amount of user data in the packet to be
// loopedback.
UINT PacketLength;
// Eventually the address of the data to be indicated
// to the transport.
PCHAR BufferAddress, LinkAddress;
// Eventually the length of the data to be indicated
// to the transport.
UINT BufferLength;
PLIST_ENTRY p;
PLT_OPEN Binding;
NdisAcquireSpinLock(&Adapter->Lock);
while((!IsListEmpty(&Adapter->LoopBack)) &&
((Adapter->Flags & ADAPTER_RESET_IN_PROGRESS) == 0))
{
p = RemoveHeadList(&Adapter->LoopBack);
Packet = CONTAINING_RECORD(
p,
NDIS_PACKET,
MacReserved);
Reserved = (PLT_PACKET_RESERVED)Packet->MacReserved;
// Remember this in CurrentLoopbackPacket in Adapter.
// Used by Transfer data.
Adapter->CurrentLoopbackPacket = Packet;
NdisReleaseSpinLock(&Adapter->Lock);
DBGPRINT(DBG_COMP_SEND, DBG_LEVEL_INFO,
("LtLoopProcessLoopback: Dequeued %lx \n", Packet));
// See if we need to copy the data from the packet
// into the loopback buffer.
//
// We need to copy to the local loopback buffer if
// the first buffer of the packet is less than the
// minimum loopback size AND the first buffer isn't
// the total packet.
NdisQueryPacket(
Packet,
NULL,
NULL,
&FirstBuffer,
&PacketLength);
NdisQueryBuffer(
FirstBuffer,
&BufferAddress,
&BufferLength);
LinkAddress = BufferAddress;
if (BufferLength != PacketLength)
{
// !!!BUGBUG: What do the sizes mean?
LtUtilsCopyFromPacketToBuffer(
Packet,
LT_DGRAM_OFFSET,
LT_MAX_INDICATE_SIZE,
Loopback,
&BufferLength);
BufferAddress = Loopback;
}
else
{
// Adjust the buffer to account for the link header
// which is not part of the lookahead.
BufferAddress += LT_DGRAM_OFFSET;
BufferLength -= LT_LINK_HEADER_LENGTH;
}
// Indicate the packet to every open binding
// that could want it. Since loopback indications
// are seralized, we use a NULL handle to indicate that it
// is for a loopback packet. TransferData always gets the
// first packet off the loopback queue.
// Since we do not have an complicated filtering to do.
// Just walk the list of Open bindings and Indicate the packet
NdisAcquireSpinLock(&Adapter->Lock);
LtRecvIndicatePacket(
Adapter,
LinkAddress,
BufferAddress,
BufferLength,
PacketLength - LT_LINK_HEADER_LENGTH,
(NDIS_HANDLE)NULL);
NdisReleaseSpinLock(&Adapter->Lock);
// We have indicated the packet to all the binding. Now we just
// need to call send completion.
DBGPRINT(DBG_COMP_LOOP, DBG_LEVEL_WARN,
("LtLoopProcessLoopback: NdisSendComplete Packet = %p\n", Packet ));
Binding = (PLT_OPEN)(Reserved->MacBindingHandle);
NdisCompleteSend(
Binding->NdisBindingContext,
Packet,
NDIS_STATUS_SUCCESS);
// Dereference the adapter and the binding for this completed
// send.
LtDeReferenceBinding(Binding);
LtDeReferenceAdapter(Adapter);
NdisAcquireSpinLock(&Adapter->Lock);
}
NdisReleaseSpinLock(&Adapter->Lock);
return;
}
