private void StartRxQueue(int queueId)
{
Log.Notice("Starting RX queue {0}", queueId);
var queue = (IxgbeRxQueue)RxQueues[queueId];
//Mempool should be >= number of rx and tx descriptors
uint mempoolSize = NumRxQueueEntries + NumTxQueueEntries;
queue.Mempool = MemoryHelper.AllocateMempool(mempoolSize < 4096 ? 4096 : mempoolSize, 2048);
if ((queue.EntriesCount & (queue.EntriesCount - 1)) != 0)
{
Log.Error("FATAL: number of queue entries must be a power of 2");
Environment.Exit(1);
}
for (ushort ei = 0; ei < queue.EntriesCount; ei++)
{
var descrAddr = queue.GetDescriptorAddress(ei);
Log.Notice("Setting up descriptor at index #{0}", ei);
//Allocate packet buffer
var packetBuffer = queue.Mempool.GetPacketBufferFast();
if (packetBuffer.IsNull)
{
Log.Error("Fatal: Could not allocate packet buffer");
Environment.Exit(1);
}
queue.WriteBufferAddress(descrAddr, packetBuffer.PhysicalAddress + PacketBuffer.DataOffset);
queue.WriteHeaderBufferAddress(descrAddr, 0);
queue.VirtualAddresses[ei] = packetBuffer.VirtualAddress;
}
//Enable queue and wait if necessary
SetFlags(IxgbeDefs.RXDCTL((uint)queueId), IxgbeDefs.RXDCTL_ENABLE);
WaitSetReg(IxgbeDefs.RXDCTL((uint)queueId), IxgbeDefs.RXDCTL_ENABLE);
//Rx queue starts out full
SetReg(IxgbeDefs.RDH((uint)queueId), 0);
//Was set to 0 before in the init function
SetReg(IxgbeDefs.RDT((uint)queueId), (uint)(queue.EntriesCount - 1));
}
private void InitMempool()
{
_mempool = MemoryHelper.AllocateMempool(BuffersCount);
//Pre-fill all our packet buffers with some templates that can be modified later
var buffers = new PacketBuffer[BuffersCount];
for (int i = 0; i < BuffersCount; i++)
{
var buffer = _mempool.GetPacketBuffer();
buffer.Size = (uint)PacketData.Length;
buffer.WriteData(0, PacketData);
var ipData = buffer.CopyData(14, 20);
buffer.WriteData(24, (short)CalcIpChecksum(ipData));
buffers[i] = buffer;
}
//Return them all to the mempool, all future allocations will return buffers with the data set above
foreach (var buffer in buffers)
{
_mempool.FreeBuffer(buffer);
}
}
