47 #endif |
48 #endif |
48 |
49 |
49 // |
50 // |
50 // Constants affecting protocol performance |
51 // Constants affecting protocol performance |
51 // |
52 // |
52 const TUint KOneSecondUs = 1000000; //< Help for converting longer times to microseconds |
53 const TUint KOneSecondInUs = 1000000; //< For sec <-> usec conversions |
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54 const TUint KOneSecondInMs = 1000; //< For sec <-> msec conversions |
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55 const TUint KOneMsInUs = 1000; //< For msec <-> usec conversions |
53 |
56 |
54 const TUint KTcpMaximumWindow = 0x3fffffff; //< Maximum receive window size |
57 const TUint KTcpMaximumWindow = 0x3fffffff; //< Maximum receive window size |
55 const TUint KTcpMinimumWindow = 1024; //< Minimum receive window size |
58 const TUint KTcpMinimumWindow = 1024; //< Minimum receive window size |
56 const TUint KTcpDefaultRcvWnd = 48 * 1024; //< Default receive window size |
59 const TUint KTcpDefaultRcvWnd = 48 * 1024; //< Default receive window size |
57 const TUint KTcpDefaultSndWnd = 16 * 1024; //< Default send window size |
60 const TUint KTcpDefaultSndWnd = 16 * 1024; //< Default send window size |
58 |
61 |
59 const TUint KTcpDefaultMSS = 65535; //< By default, MSS is not limited by user |
62 const TUint KTcpDefaultMSS = 65535; //< By default, MSS is not limited by user |
60 const TUint KTcpStandardMSS = 536; //< Internet standard MSS |
63 const TUint KTcpStandardMSS = 536; //< Internet standard MSS |
61 const TUint KTcpMinimumMSS = 64; //< Minimum acceptable MSS. |
64 const TUint KTcpMinimumMSS = 64; //< Minimum acceptable MSS. |
62 const TUint KTcpMaxTransmit = 2; //< Transmit at most this many segments at one time. |
65 const TUint KTcpMaxTransmit = 1; //< Transmit at most this many segments at one time. |
63 |
66 |
64 const TUint KTcpMinRTO = 1000000; //< us (1s) |
67 const TUint KTcpMinRTO = 1000000; //< us (1s) |
65 const TUint KTcpMaxRTO = 60000000; //< us (60s) |
68 const TUint KTcpMaxRTO = 60000000; //< us (60s) |
66 const TUint KTcpInitialRTO = 3000000; //< us (3s) |
69 const TUint KTcpInitialRTO = 3000000; //< us (3s) |
67 const TUint KTcpSrttSmooth = 8; //< alpha = 1/8 |
70 const TUint KTcpSrttSmooth = 8; //< alpha = 1/8 |
512 TUint32 iFRTOsent; //< True, if rto was sent and no acks have yet arrived |
515 TUint32 iFRTOsent; //< True, if rto was sent and no acks have yet arrived |
513 TTcpSeqNum iRealSendHigh; //< iSendHigh is not real with SACK |
516 TTcpSeqNum iRealSendHigh; //< iSendHigh is not real with SACK |
514 |
517 |
515 // -1=linger disabled, >=0 linger enabled with given time in seconds. |
518 // -1=linger disabled, >=0 linger enabled with given time in seconds. |
516 TInt iLinger; |
519 TInt iLinger; |
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520 |
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521 //Introduce specifically for Browser usecase where in Normal shutdown is expected to close with in certain time. |
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522 //current structure is using secs. This Bit will enable calculation in Mircosecs. |
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523 TBool iMicroSecCalcFlag; |
517 |
524 |
518 // Window scaling factor for the send window, advertised by the other end. |
525 // Window scaling factor for the send window, advertised by the other end. |
519 TUint8 iSndWscale:4; |
526 TUint8 iSndWscale:4; |
520 |
527 |
521 // Window scaling factor for receive window, based on ini settings. |
528 // Window scaling factor for receive window, based on ini settings. |
780 iDelayAckTimer->Cancel(); |
787 iDelayAckTimer->Cancel(); |
781 } |
788 } |
782 |
789 |
783 inline TUint32 CProviderTCP6::TimeStamp() |
790 inline TUint32 CProviderTCP6::TimeStamp() |
784 { |
791 { |
785 TTime now; |
792 TInt tickPeriod; |
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793 TUint64 ticsInMs; |
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794 // |
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795 HAL::Get( HAL::ENanoTickPeriod, tickPeriod ); |
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796 ticsInMs = (static_cast<TUint64> ( User::NTickCount() ) * tickPeriod) |
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797 / KOneMsInUs; |
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798 return static_cast<TUint32> ( ticsInMs ); |
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799 /* |
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800 // This used to return micro seconds, but since the resolution of NTick |
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801 // is something around ~1ms, we return now the timestamp in milliseconds |
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802 // (which is more than sufficient resolution for this). This is done to |
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803 // mittigate the risk of counter overflow. |
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804 // The existing implementation is commented and not removed for future reference |
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805 // if required. |
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806 TTime now; |
786 now.UniversalTime(); |
807 now.UniversalTime(); |
787 #ifdef I64LOW |
808 #ifdef I64LOW |
788 return I64LOW(now.Int64()); |
809 return I64LOW(now.Int64()); |
789 #else |
810 #else |
790 return (TUint32)now.Int64().GetTInt(); |
811 return (TUint32)now.Int64().GetTInt(); |
791 #endif |
812 #endif |
|
813 */ |
792 } |
814 } |
793 |
815 |
794 /** |
816 /** |
795 * Return maximum segment size allowed by transmission path. Following tradition, |
817 * Return maximum segment size allowed by transmission path. Following tradition, |
796 * the value represents the maximum number of data bytes that can be passed in |
818 * the value represents the maximum number of data bytes that can be passed in |