ZeroTier now has link quality measurement. We are not using this yet but decided to put it in to prep for future QoS support and SD-WAN stuff.
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2bf9145ae6
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1d39be61b2
9 changed files with 111 additions and 22 deletions
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@ -21,6 +21,7 @@
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdexcept>
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#include <algorithm>
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@ -30,6 +31,7 @@
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#include "SharedPtr.hpp"
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#include "AtomicCounter.hpp"
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#include "NonCopyable.hpp"
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#include "Utils.hpp"
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/**
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* Maximum return value of preferenceRank()
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@ -105,22 +107,34 @@ public:
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_lastOut(0),
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_lastIn(0),
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_lastTrustEstablishedPacketReceived(0),
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_incomingLinkQualityFastLog(0xffffffffffffffffULL),
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_incomingLinkQualitySlowLogPtr(0),
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_incomingLinkQualitySlowLogCounter(-64), // discard first fast log
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_incomingLinkQualityPreviousPacketCounter(0),
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_outgoingPacketCounter(0),
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_addr(),
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_localAddress(),
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_ipScope(InetAddress::IP_SCOPE_NONE)
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{
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for(int i=0;i<(int)sizeof(_incomingLinkQualitySlowLog);++i)
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_incomingLinkQualitySlowLog[i] = ZT_PATH_LINK_QUALITY_MAX;
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}
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Path(const InetAddress &localAddress,const InetAddress &addr) :
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_lastOut(0),
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_lastIn(0),
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_lastTrustEstablishedPacketReceived(0),
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_incomingLinkQualityFastLog(0xffffffffffffffffULL),
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_incomingLinkQualitySlowLogPtr(0),
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_incomingLinkQualitySlowLogCounter(-64), // discard first fast log
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_incomingLinkQualityPreviousPacketCounter(0),
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_outgoingPacketCounter(0),
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_addr(addr),
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_localAddress(localAddress),
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_ipScope(addr.ipScope())
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{
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for(int i=0;i<(int)sizeof(_incomingLinkQualitySlowLog);++i)
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_incomingLinkQualitySlowLog[i] = ZT_PATH_LINK_QUALITY_MAX;
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}
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/**
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@ -130,6 +144,39 @@ public:
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*/
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inline void received(const uint64_t t) { _lastIn = t; }
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/**
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* Update link quality using a counter from an incoming packet (or packet head in fragmented case)
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*
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* @param counter Packet link quality counter (range 0 to 7, must not have other bits set)
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*/
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inline void updateLinkQuality(const unsigned int counter)
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{
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const unsigned int prev = _incomingLinkQualityPreviousPacketCounter;
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_incomingLinkQualityPreviousPacketCounter = counter;
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const uint64_t fl = (_incomingLinkQualityFastLog = ((_incomingLinkQualityFastLog << 1) | (uint64_t)(prev == ((counter - 1) & 0x7))));
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if (++_incomingLinkQualitySlowLogCounter >= 64) {
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_incomingLinkQualitySlowLogCounter = 0;
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_incomingLinkQualitySlowLog[_incomingLinkQualitySlowLogPtr++ % sizeof(_incomingLinkQualitySlowLog)] = Utils::countBits(fl);
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}
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}
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/**
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* @return Link quality from 0 (min) to 255 (max)
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*/
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inline unsigned int linkQuality() const
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{
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unsigned long slsize = _incomingLinkQualitySlowLogPtr;
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if (slsize > (unsigned long)sizeof(_incomingLinkQualitySlowLog))
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slsize = (unsigned long)sizeof(_incomingLinkQualitySlowLog);
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else if (!slsize)
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return 255; // ZT_PATH_LINK_QUALITY_MAX
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unsigned long lq = 0;
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for(unsigned long i=0;i<slsize;++i)
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lq += (unsigned long)_incomingLinkQualitySlowLog[i] * 4;
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lq /= slsize;
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return (unsigned int)((lq >= 255) ? 255 : lq);
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}
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/**
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* Set time last trusted packet was received (done in Peer::received())
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*/
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@ -251,13 +298,18 @@ public:
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inline unsigned int nextOutgoingCounter() { return _outgoingPacketCounter++; }
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private:
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uint64_t _lastOut;
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uint64_t _lastIn;
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uint64_t _lastTrustEstablishedPacketReceived;
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unsigned int _outgoingPacketCounter;
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volatile uint64_t _lastOut;
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volatile uint64_t _lastIn;
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volatile uint64_t _lastTrustEstablishedPacketReceived;
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volatile uint64_t _incomingLinkQualityFastLog;
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volatile unsigned long _incomingLinkQualitySlowLogPtr;
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volatile signed int _incomingLinkQualitySlowLogCounter;
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volatile unsigned int _incomingLinkQualityPreviousPacketCounter;
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volatile unsigned int _outgoingPacketCounter;
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InetAddress _addr;
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InetAddress _localAddress;
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InetAddress::IpScope _ipScope; // memoize this since it's a computed value checked often
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volatile uint8_t _incomingLinkQualitySlowLog[32];
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AtomicCounter __refCount;
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};
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