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Annotation of ntddk/src/network/lance/loopback.c, revision 1.1.1.1

1.1       root        1: /*++
                      2: 
                      3: Copyright (c) 1990  Microsoft Corporation
                      4: 
                      5: Module Name:
                      6: 
                      7:     loopback.c
                      8: 
                      9: Abstract:
                     10: 
                     11:     The routines here indicate packets on the loopback queue and are
                     12:     responsible for inserting and removing packets from the loopback
                     13:     queue and the send finishing queue.
                     14: 
                     15: Author:
                     16: 
                     17:     Anthony V. Ercolano (Tonye) 12-Sept-1990
                     18: 
                     19: Environment:
                     20: 
                     21:     Operates at dpc level - or the equivalent on os2 and dos.
                     22: 
                     23: Revision History:
                     24: 
                     25: 
                     26: --*/
                     27: 
                     28: #include <ndis.h>
                     29: #include <efilter.h>
                     30: #include <lancehrd.h>
                     31: #include <lancesft.h>
                     32: 
                     33: 
                     34: extern
                     35: VOID
                     36: LanceProcessLoopback(
                     37:     IN PLANCE_ADAPTER Adapter
                     38:     )
                     39: 
                     40: /*++
                     41: 
                     42: Routine Description:
                     43: 
                     44:     This routine is responsible for indicating *one* packet on
                     45:     the loopback queue either completing it or moving on to the
                     46:     finish send queue.
                     47: 
                     48:     NOTE: THIS IS CALLED WITH THE SPIN LOCK HELD!!
                     49: 
                     50: Arguments:
                     51: 
                     52:     Adapter - The adapter whose loopback queue we are processing.
                     53: 
                     54: Return Value:
                     55: 
                     56:     None.
                     57: 
                     58: --*/
                     59: 
                     60: {
                     61:     //
                     62:     // Packet at the head of the loopback list.
                     63:     //
                     64:     PNDIS_PACKET PacketToMove;
                     65: 
                     66:     //
                     67:     // The reserved portion of the above packet.
                     68:     //
                     69:     PLANCE_RESERVED Reserved;
                     70: 
                     71:     //
                     72:     // Eventually the length of the data to be indicated
                     73:     // to the transport.
                     74:     //
                     75:     UINT BufferLength;
                     76: 
                     77:     //
                     78:     // Length of the packet
                     79:     //
                     80:     UINT TotalPacketLength;
                     81: 
                     82:     PLANCE_OPEN Open;
                     83: 
                     84:     PacketToMove = Adapter->FirstLoopBack;
                     85: 
                     86:     Adapter->IndicatingMacReceiveContext.WholeThing = (UINT)PacketToMove;
                     87: 
                     88:     Adapter->IndicatedAPacket = TRUE;
                     89: 
                     90:     Reserved = PLANCE_RESERVED_FROM_PACKET(PacketToMove);
                     91: 
                     92:     Open = PLANCE_OPEN_FROM_BINDING_HANDLE(Reserved->MacBindingHandle);
                     93: 
                     94:     if (!Reserved->Next) {
                     95: 
                     96:         Adapter->LastLoopBack = NULL;
                     97: 
                     98:     }
                     99: 
                    100:     Adapter->FirstLoopBack = Reserved->Next;
                    101: 
                    102:     Adapter->IndicatingMacReceiveContext.WholeThing = (UINT)PacketToMove;
                    103: 
                    104:     NdisReleaseSpinLock(&Adapter->Lock);
                    105: 
                    106:     //
                    107:     // See if we need to copy the data from the packet
                    108:     // into the lookahead buffer.
                    109:     //
                    110:     // We need to copy to the adapter lookahead buffer if
                    111:     // the first buffer of the packet is less than the
                    112:     // minimum loopback size AND the first buffer isn't
                    113:     // the total packet.
                    114:     //
                    115: 
                    116:     NdisQueryPacket(
                    117:         PacketToMove,
                    118:         NULL,
                    119:         NULL,
                    120:         NULL,
                    121:         &TotalPacketLength
                    122:         );
                    123: 
                    124:     BufferLength = ((TotalPacketLength < (Adapter->MaxLookAhead + LANCE_HEADER_SIZE))?
                    125:                     TotalPacketLength :
                    126:                     Adapter->MaxLookAhead + LANCE_HEADER_SIZE);
                    127: 
                    128:     LanceCopyFromPacketToBuffer(
                    129:             PacketToMove,
                    130:             0,
                    131:             Adapter->SizeOfReceiveBuffer,
                    132:             Adapter->Lookahead,
                    133:             &BufferLength
                    134:             );
                    135: 
                    136:     //
                    137:     // Indicate the packet to every open binding
                    138:     // that could want it.
                    139:     //
                    140: 
                    141:     if (BufferLength < LANCE_HEADER_SIZE) {
                    142: 
                    143:         if (BufferLength >= ETH_LENGTH_OF_ADDRESS) {
                    144: 
                    145:             //
                    146:             // Runt packet
                    147:             //
                    148: 
                    149:             EthFilterIndicateReceive(
                    150:                 Adapter->FilterDB,
                    151:                 PacketToMove,
                    152:                 ((PCHAR)(Adapter->Lookahead)),
                    153:                 Adapter->Lookahead,
                    154:                 BufferLength,
                    155:                 NULL,
                    156:                 0,
                    157:                 0
                    158:                 );
                    159:         }
                    160: 
                    161:     } else {
                    162: 
                    163:         EthFilterIndicateReceive(
                    164:             Adapter->FilterDB,
                    165:             PacketToMove,
                    166:             ((PCHAR)(Adapter->Lookahead)),
                    167:             Adapter->Lookahead,
                    168:             LANCE_HEADER_SIZE,
                    169:             Adapter->Lookahead + LANCE_HEADER_SIZE,
                    170:             BufferLength - LANCE_HEADER_SIZE,
                    171:             TotalPacketLength - LANCE_HEADER_SIZE
                    172:             );
                    173: 
                    174:     }
                    175: 
                    176:     NdisCompleteSend(
                    177:             Open->NdisBindingContext,
                    178:             PacketToMove,
                    179:             ((Reserved->SuccessfulTransmit)?
                    180:              (NDIS_STATUS_SUCCESS):(NDIS_STATUS_FAILURE))
                    181:             );
                    182: 
                    183: 
                    184:     NdisAcquireSpinLock(&Adapter->Lock);
                    185: 
                    186:     //
                    187:     // Remove reference for packet
                    188:     //
                    189: 
                    190:     Open->References--;
                    191: 
                    192: }
                    193: 

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