92 lines
2.8 KiB
C#
92 lines
2.8 KiB
C#
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// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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using NetStack.Common;
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using Microsoft.Contracts;
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using Microsoft.Singularity;
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using System;
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using System.Collections;
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using System.Diagnostics;
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using System.Net.IP;
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using Drivers.Net;
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using NetStack.NetDrivers;
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using NetStack.Protocols;
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namespace NetStack.Runtime
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{
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// Helper class to help feed packets from adapter into DeMultiplexer
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public class DemuxAdapterArgs : Dispatcher.CallbackArgs
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{
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private IAdapter! adapter;
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public DemuxAdapterArgs(IAdapter! adapter)
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{
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this.adapter = adapter;
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base();
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}
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public IAdapter! Adapter { get { return adapter; } }
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}
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// This class provides the basic demultiplexing of packets as
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// they come in from a network device. This component of the
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// system is critical for several reasons. First, it is the place
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// where backpressure is applied; this should be the only place
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// in the system where packets are thrown away because of overload
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// Second, it is the place where "flows" in the system are separated
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// and where their resource controls are applied; subsequent
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// processing can be done entirely with the resources (including
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// potentially CPU resources) belonging to the "flow".
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public class DeMultiplexer
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{
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// Private data
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private Queue! rxQueue;
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private Queue! tmpQueue;
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[NotDelayed]
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public DeMultiplexer()
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{
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this.rxQueue = new Queue();
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this.tmpQueue = new Queue();
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base();
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}
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// Add a new packet to the free list
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public void TakeFreePacket(NetPacket! pkt)
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{
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IAdapter! adapter = (IAdapter!)pkt.AdapterContext;
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pkt.Reset();
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adapter.PopulateRxRing(pkt);
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}
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public bool PacketsReady { get { return rxQueue.Count > 0; } }
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public NetPacket! GetReceivedPacket()
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{
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NetPacket! pkt = (NetPacket!)this.rxQueue.Dequeue();
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DebugStub.Assert(pkt.AdapterContext != null);
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return pkt;
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}
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public NetStatus OnAdapterReceive(Dispatcher.CallbackArgs ca)
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{
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DemuxAdapterArgs daa = (DemuxAdapterArgs!)ca;
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IAdapter adapter = daa.Adapter;
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adapter.GetReceivedPackets(this.tmpQueue);
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while (tmpQueue.Count > 0) {
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NetPacket! np = (NetPacket!)this.tmpQueue.Dequeue();
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np.AdapterContext = adapter;
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rxQueue.Enqueue(np);
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}
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Core.Instance().SignalInboundPackets();
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return NetStatus.Code.RT_OK;
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}
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} // DeMultiplexer
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} // NetStack
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// End
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