Adaptec 1737100 Programmer Manual - Page 186

In the Skip Field portion of the Transmit Buffer the Reserved

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AIC-6915 Ethernet LAN Controller Programmer's Manual 8-26 Adapter->MapRegisterIndex, TRUE, PhysicalSegmentArray, &BufferPhysicalSegments); // Put each physical segment for this buffer into a Transmit Buffer // Descriptor for (ii = 0 ; ii < BufferPhysicalSegments; ii++) { PhysicalAddressUnit = PhysicalSegmentArray[ii] ; // Get a local copy of this Transmit Buffer Descriptor TxDesc = Adapter->TxDesc[CurrentTxDescIndex]; // We only fill in the NumberOfFragments field and the owning packet // for the descriptor pointing to the first fragment of the first // buffer for a Type 1 descriptor TxDesc->DWORD0.NumFrags = 0; if ( (ii == 0) && FirstBuffer ) { // In the Skip Field portion of the Transmit Buffer (the Reserved // field),save the address of the originating packet. This will be // used later // when we process the Transmit Complete interrupt. TxDesc->Reserved.OwningPacket = Packet; FirstBuffer = FALSE; // Remember where this packet started PacketStartIndex = CurrentTxDescIndex; PacketStartTxDesc = Adapter->TxDesc[PacketStartIndex]; } TxDesc->BufferAddress = NdisGetPhysicalAddressLow(PhysicalAddressUnit.PhysicalAddress); TxDesc->DWORD0.Length = PhysicalAddressUnit.Length; TxDesc->DWORD0.End = 0; // Keep track of the number of fragments in the first descriptor PacketStartTxDesc->DWORD0.NumFrags++; CurrentTxDescIndex++; // If we're approaching the end of the descriptor queue, roll // over. if (Rollover) { // Set the end bit - in the first descriptor for this packet PacketStartTxDesc->DWORD0.End = 1; CurrentTxDescIndex = 0; Rollover = False; } // Get the next buffer in this packet NdisGetNextBuffer(CurrentBuffer,

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8-26
AIC-6915 Ethernet LAN Controller Programmer’s Manual
Adapter->MapRegisterIndex,
TRUE,
PhysicalSegmentArray,
&BufferPhysicalSegments);
// Put each physical segment for this buffer into a Transmit Buffer
// Descriptor
for (ii = 0 ; ii < BufferPhysicalSegments; ii++)
{
PhysicalAddressUnit = PhysicalSegmentArray[ii] ;
// Get a local copy of this Transmit Buffer Descriptor
TxDesc = Adapter->TxDesc[CurrentTxDescIndex];
// We only fill in the NumberOfFragments field and the owning packet
// for the descriptor pointing to the first fragment of the first
// buffer for a Type 1 descriptor
TxDesc->DWORD0.NumFrags = 0;
if ( (ii == 0) && FirstBuffer )
{
// In the Skip Field portion of the Transmit Buffer (the Reserved
// field),save the address of the originating packet.
This will be
// used later
// when we process the Transmit Complete interrupt.
TxDesc->Reserved.OwningPacket = Packet;
FirstBuffer = FALSE;
// Remember where this packet started
PacketStartIndex = CurrentTxDescIndex;
PacketStartTxDesc = Adapter->TxDesc[PacketStartIndex];
}
TxDesc->BufferAddress =
NdisGetPhysicalAddressLow(PhysicalAddressUnit.PhysicalAddress);
TxDesc->DWORD0.Length = PhysicalAddressUnit.Length;
TxDesc->DWORD0.End = 0;
// Keep track of the number of fragments in the first descriptor
PacketStartTxDesc->DWORD0.NumFrags++;
CurrentTxDescIndex++;
// If we're approaching the end of the descriptor queue, roll
// over.
if (Rollover)
{
// Set the end bit - in the first descriptor for this packet
PacketStartTxDesc->DWORD0.End = 1;
CurrentTxDescIndex = 0;
Rollover = False;
}
// Get the next buffer in this packet
NdisGetNextBuffer(CurrentBuffer,