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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
loopback.c
Abstract:
The routines here indicate packets on the loopback queue and are
responsible for inserting and removing packets from the loopback
queue and the send finishing queue.
Author:
Johnson R. Apacible (JohnsonA) 10-Jul-1991
Environment:
Operates at dpc level - or the equivalent on os2 and dos.
Revision History:
--*/
#include <ndis.h>
//
// So we can trace things...
//
#define STATIC
#include <efilter.h>
#include <elnkhw.h>
#include <elnksw.h>
VOID
ElnkProcessLoopback(
IN PELNK_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.
NOTE: Called with the lock held!!!
Arguments:
Adapter - The adapter whose loopback queue we are processing.
Return Value:
None.
--*/
{
if (Adapter->FirstLoopBack) {
//
// Packet at the head of the loopback list.
//
PNDIS_PACKET PacketToMove;
//
// The reserved portion of the above packet.
//
PELNK_RESERVED Reserved;
//
// The first buffer in the ndis packet to be loopbacked.
//
PNDIS_BUFFER FirstBuffer;
//
// The total amount of user data in the packet to be
// loopbacked.
//
UINT TotalPacketLength;
//
// Eventually the address of the data to be indicated
// to the transport.
//
PVOID BufferAddress;
//
// Eventually the length of the data to be indicated
// to the transport.
//
UINT BufferLength;
PELNK_OPEN Open;
PacketToMove = Adapter->FirstLoopBack;
Reserved = PELNK_RESERVED_FROM_PACKET(PacketToMove);
//
// Remove packet from loopback queue
//
if (!Reserved->Next) {
Adapter->LastLoopBack = NULL;
}
Adapter->FirstLoopBack = Reserved->Next;
Adapter->IndicatedAPacket = TRUE;
Open = PELNK_OPEN_FROM_BINDING_HANDLE(Reserved->MacBindingHandle);
NdisReleaseSpinLock(&Adapter->Lock);
//
// 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(
PacketToMove,
NULL,
NULL,
&FirstBuffer,
&TotalPacketLength
);
NdisQueryBuffer(
FirstBuffer,
&BufferAddress,
&BufferLength
);
if ((BufferLength < ELNK_SIZE_OF_LOOKAHEAD) &&
(BufferLength != TotalPacketLength)) {
ElnkCopyFromPacketToBuffer(
PacketToMove,
0,
ELNK_SIZE_OF_LOOKAHEAD,
Adapter->Loopback,
&BufferLength
);
BufferAddress = Adapter->Loopback;
}
//
// Indicate the packet to every open binding
// that could want it.
//
if ELNKDEBUG DPrint1("Loopback: indicating receive\n");
if (BufferLength < ELNK_HEADER_SIZE) {
//
// Must have at least an address
//
if (BufferLength > 5) {
EthFilterIndicateReceive(
Adapter->FilterDB,
PacketToMove,
((PCHAR)BufferAddress),
BufferAddress,
BufferLength,
NULL,
0,
0
);
}
} else {
EthFilterIndicateReceive(
Adapter->FilterDB,
PacketToMove,
((PCHAR)BufferAddress),
BufferAddress,
ELNK_HEADER_SIZE,
((PUCHAR)BufferAddress) + ELNK_HEADER_SIZE,
BufferLength - ELNK_HEADER_SIZE,
TotalPacketLength - ELNK_HEADER_SIZE
);
}
NdisCompleteSend(
Open->NdisBindingContext,
PacketToMove,
((Reserved->SuccessfulTransmit)?
(NDIS_STATUS_SUCCESS):(NDIS_STATUS_FAILURE))
);
NdisAcquireSpinLock(&Adapter->Lock);
//
// We can decrement the reference count since it is the one left
// from when we submitted the packet.
//
Open->References--;
}
}
VOID
ElnkPutPacketOnFinishTrans(
IN PELNK_ADAPTER Adapter,
IN PNDIS_PACKET Packet
)
/*++
Routine Description:
Put the packet on the adapter wide queue for packets that
are transmitting.
NOTE: This routine assumes that the lock is held.
NOTE: By definition any packet given to this routine is ready
to complete.
Arguments:
Adapter - The adapter that contains the queue.
Packet - The packet to be put on the queue.
Return Value:
None.
--*/
{
PELNK_RESERVED Reserved = PELNK_RESERVED_FROM_PACKET(Packet);
if (Adapter->LastFinishTransmit) {
PELNK_RESERVED LastReserved =
PELNK_RESERVED_FROM_PACKET(Adapter->LastFinishTransmit);
LastReserved->Next = Packet;
}
Reserved->Next = NULL;
Adapter->LastFinishTransmit = Packet;
if (!Adapter->FirstFinishTransmit) {
Adapter->FirstFinishTransmit = Packet;
}
Adapter->TransmitsQueued--;
}
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