//push a single packet onto the ring
void IAdapter.PopulateTxRing(Bytes header, Bytes data)
{
try {
PacketFifo txFree = this.txFreeFifo.Acquire();
PacketFifo txToDevice = this.txFifo.Acquire();
DebugPrint("populate tx ring\n");
try {
Packet packet = txFree.Pop();
packet.SetFragment(0, header);
packet.SetFragment(1, data);
txToDevice.Push(packet);
}
finally {
this.txFreeFifo.Release(txFree);
this.txFifo.Release(txToDevice);
}
}
catch (Exception e) {
DebugStub.Print("Populate tx ring failed?? {0}\n", DebugStub.ArgList(e));
DebugStub.Break();
}
//When to exchange?
//how do we best manage the tradeoff of throughput and latency?
//to begin let's just send one at a time.
//I think i'd rather have another thread....
using (thisLock.Lock()) {
TxExchange();
}
}
private void TxExchange()
{
int toCount = 0;
int fromCount = 0;
NicDeviceContract /*.Imp*/ imp = (NicDeviceContract)nicChannel.Acquire();
try {
PacketFifo src = this.txFifo.Acquire();
PacketFifo free = this.txFreeFifo.Acquire();
toCount = src.Count;
try {
src = imp.GiveTxPacketsToDevice(src);
fromCount = src.Count;
free.Push(src);
}
finally {
this.txFreeFifo.Release(free);
this.txFifo.Release(src);
}
}
catch (Exception e) {
DebugStub.Print("TxExchange FAILED arg {0}\n", DebugStub.ArgList(e.ToString()));
DebugStub.Break();
}
finally {
nicChannel.Release(imp);
}
DebugPrint("TxExchange out: {0} in: {1}\n",
toCount, fromCount);
}
// Get the received packets from the adapter
void DeMuxReceivedPackets()
{
//Grab the latest set of packets
RxExchange();
PacketFifo newPackets = this.rxFifo.Acquire();
try {
int count = newPackets.Count;
for (int i = 0; i < count; i++)
{
Packet packet = newPackets.Pop();
// If packet from device has an error
// recycle it right away.
FromDeviceFlags fromFlags = packet.FromDeviceFlags;
if ((fromFlags & FromDeviceFlags.ReceiveError) != 0)
{
DebugStub.Print("Packet had error???\n");
newPackets.Push(packet);
continue;
}
Bytes data = packet.ReleaseFragment(0);
Ethernet.ProcessIncomingPacket(data, this);
#if false
if (filterAdapter == null ||
filterAdapter.ProcessIncomingPacket(data))
{
Ethernet.ProcessIncomingPacket(data, this);
}
else
{
//delete data;
}
#endif
//XXX Totally inefficient first try immediately replaces
//the lost data.
Bytes nxtPacket = new Bytes(new byte[this.mtu]);
packet.SetFragment(0, nxtPacket);
newPackets.Push(packet);
}
}
finally {
this.rxFifo.Release(newPackets);
}
}
private void RxProvisionInternal(PacketFifo toDevice)
{
for (int i = 0; i < toDevice.Capacity; i++)
{
toDevice.Push(
new Packet(
new Bytes(new byte[this.mtu])
)
);
}
}
internal void LockedDrainRecvBuffer(PacketFifo toUser)
{
DmaMemory mem;
ulong controlBits;
while (rxRingBuffer.Peek(out mem, out controlBits))
{
Packet packet = MakePacketFromDescriptor(mem, controlBits);
toUser.Push(packet);
rxRingBuffer.Pop();
}
}
//since data comes from the user, the packets are empty shells
//with a default of two fragments; one for the header and one for
//the packet body
private void TxProvision()
{
PacketFifo txFree = this.txFreeFifo.Acquire();
for (int i = 0; i < txFree.Capacity; i++)
{
txFree.Push(
new Packet(2)
);
}
this.txFreeFifo.Release(txFree);
}
internal void LockedPushTsmtBuffer(Packet packet)
{
DebugStub.Assert(packet.FragmentCount == 1);
DebugStub.Assert(!txRingBuffer.IsFull);
this._LockedPushTsmtBuffer(packet);
PacketFifo liveFifo = this.txPacketsInDevice.Acquire();
liveFifo.Push(packet);
txPacketsInDevice.Release(liveFifo);
}
//push a single packet onto the ring
void IAdapter.PopulateTxRing(Bytes header, Bytes data)
{
try {
PacketFifo txFree = this.txFreeFifo.Acquire();
PacketFifo txCoalesce = this.txCoalesceFifo.Acquire();
try {
DebugStub.Assert(txFree.Count > 0);
int cnt = 0;
while (txFree.Count <= 0)
{
//try again...
//this happens when we're hammering the outgoing connection
this.txCoalesceFifo.Release(txCoalesce);
this.txFreeFifo.Release(txFree);
this.muxEvent.Set();
Thread.Yield();
txFree = this.txFreeFifo.Acquire();
txCoalesce = this.txCoalesceFifo.Acquire();
if (cnt > 100)
{
DebugStub.Print("txFree empty???\n");
//DebugStub.Break();
}
cnt++;
}
Packet packet = txFree.Pop();
packet.SetFragment(0, header);
packet.SetFragment(1, data);
if ((txCoalesce.Count + 1) > txCoalesce.Capacity)
{
DebugStub.Break();
}
DebugStub.Assert((txCoalesce.Count + 1) <= txCoalesce.Capacity);
txCoalesce.Push(packet);
}
catch {
DebugStub.Print("failure in populate tx ring\n");
DebugStub.Break();
DebugStub.Assert(false);
}
finally {
this.txCoalesceFifo.Release(txCoalesce);
this.txFreeFifo.Release(txFree);
//notify the mux that there are waiting packets
this.muxEvent.Set();
}
}
catch (Exception e) {
DebugStub.Print("Populate tx ring failed?? {0}\n", DebugStub.ArgList(e));
DebugStub.Break();
}
}
internal void LockedPushRecvBuffer(Packet packet)
{
DebugStub.Assert(packet.FragmentCount == 1);
DebugStub.Assert(!rxRingBuffer.IsFull);
int length = packet.GetFragmentLength(0);
this.LockedPushRecvBuffer(length);
PacketFifo liveFifo = this.rxPacketsInDevice.Acquire();
liveFifo.Push(packet);
rxPacketsInDevice.Release(liveFifo);
}
public void Run()
{
System.DebugStub.Print("Nic@" + Kernel.CurrentThread + ". ");
while (true)
{
this.muxEvent.WaitOne();
PacketFifo txCoalesce = this.txCoalesceFifo.Acquire();
PacketFifo txToDevice = this.txFifo.Acquire();
try {
DebugPrint("coalescing {0} packets\n", txCoalesce.Count);
txToDevice.Push(txCoalesce);
}
catch (Exception e) {
DebugStub.Print("Mux FAILED! arg {0}\n", DebugStub.ArgList(e.ToString()));
DebugStub.Break();
}
finally {
this.txCoalesceFifo.Release(txCoalesce);
this.txFifo.Release(txToDevice);
TxExchange();
}
}
}