public IxgbeDevice(string pciAddr, int rxQueues, int txQueues)
: base(pciAddr, rxQueues, txQueues)
{
if (txQueues < 0 || txQueues > MaxQueues)
{
throw new ArgumentException(String.Format("Cannot configure {0} tx queues - limit is {1}",
txQueues, MaxQueues));
}
if (rxQueues < 0 || rxQueues > MaxQueues)
{
throw new ArgumentException(String.Format("Cannot configure {0} rx queues - limit is {1}",
rxQueues, MaxQueues));
}
DriverName = "ixy-ixgbe";
RxQueues = new IxgbeRxQueue[rxQueues];
TxQueues = new IxgbeTxQueue[txQueues];
PciController.RemoveDriver(pciAddr);
PciController.EnableDma(pciAddr);
try
{
//View accessor for mmapped file is automatically created
PciMemMap = PciController.MapResource(pciAddr);
}
catch (Exception e)
{
Log.Error("FATAL: Could not map memory for device {0} - {1}", pciAddr, e.Message);
Environment.Exit(1);
}
ResetAndInit();
}
private void InitRx()
{
//Disable RX while re-configuring
ClearFlags(IxgbeDefs.RXCTRL, IxgbeDefs.RXCTRL_RXEN);
//No DCB or VT, just a single 128kb packet buffer
SetReg(IxgbeDefs.RXPBSIZE(0), IxgbeDefs.RXPBSIZE_128KB);
for (uint i = 1; i < 8; i++)
{
SetReg(IxgbeDefs.RXPBSIZE(i), 0);
}
//Always enable CRC offloading
SetFlags(IxgbeDefs.HLREG0, IxgbeDefs.HLREG0_RXCRCSTRP);
SetFlags(IxgbeDefs.RDRXCTL, IxgbeDefs.RDRXCTL_CRCSTRIP);
//Accept broadcast packets
SetFlags(IxgbeDefs.FCTRL, IxgbeDefs.FCTRL_BAM);
//Per queue config
for (uint i = 0; i < RxQueues.Length; i++)
{
Log.Notice("Initializing rx queue {0}", i);
//Enable advanced rx descriptors
SetReg(IxgbeDefs.SRRCTL(i), (GetReg(IxgbeDefs.SRRCTL(i)) & ~IxgbeDefs.SRRCTL_DESCTYPE_MASK)
| IxgbeDefs.SRRCTL_DESCTYPE_ADV_ONEBUF);
//DROP_EN causes the NIC to drop packets if no descriptors are available instead of buffering them
//A single overflowing queue can fill up the whole buffer and impact operations if not setting this
SetFlags(IxgbeDefs.SRRCTL(i), IxgbeDefs.SRRCTL_DROP_EN);
//Sec 7.1.9 - Set up descriptor ring
int ringSizeBytes = NumRxQueueEntries * RxDescriptorSize;
var dmaMem = MemoryHelper.AllocateDmaC((uint)ringSizeBytes, true);
//TODO : The C version sets the allocated memory to -1 here
SetReg(IxgbeDefs.RDBAL(i), (uint)(dmaMem.PhysicalAddress & 0xFFFFFFFFL));
SetReg(IxgbeDefs.RDBAH(i), (uint)(dmaMem.PhysicalAddress >> 32));
SetReg(IxgbeDefs.RDLEN(i), (uint)ringSizeBytes);
Log.Notice("RX ring {0} physical address: {1}", i, dmaMem.PhysicalAddress);
Log.Notice("RX ring {0} virtual address: {1}", i, dmaMem.VirtualAddress);
//Set ring to empty
SetReg(IxgbeDefs.RDH(i), 0);
SetReg(IxgbeDefs.RDT(i), 0);
var queue = new IxgbeRxQueue(NumRxQueueEntries);
queue.Index = 0;
queue.DescriptorsAddr = dmaMem.VirtualAddress;
RxQueues[i] = queue;
}
//Section 4.6.7 - set some magic bits
SetFlags(IxgbeDefs.CTRL_EXT, IxgbeDefs.CTRL_EXT_NS_DIS);
//This flag probably refers to a broken feature: It's reserved and initialized as '1' but it must be '0'
for (uint i = 0; i < RxQueues.Length; i++)
{
ClearFlags(IxgbeDefs.DCA_RXCTRL(i), 1 << 12);
}
//Start RX
SetFlags(IxgbeDefs.RXCTRL, IxgbeDefs.RXCTRL_RXEN);
}