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tcp: Make retransmission timeout (RTO) configurable
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@ -1901,8 +1901,10 @@ tcp_alloc(u8_t prio)
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/* As initial send MSS, we use TCP_MSS but limit it to 536.
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/* As initial send MSS, we use TCP_MSS but limit it to 536.
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The send MSS is updated when an MSS option is received. */
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The send MSS is updated when an MSS option is received. */
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pcb->mss = INITIAL_MSS;
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pcb->mss = INITIAL_MSS;
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pcb->rto = 3000 / TCP_SLOW_INTERVAL;
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/* Set initial TCP's retransmission timeout to 3000 ms by default.
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pcb->sv = 3000 / TCP_SLOW_INTERVAL;
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This value could be configured in lwipopts */
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pcb->rto = LWIP_TCP_RTO_TIME / TCP_SLOW_INTERVAL;
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pcb->sv = LWIP_TCP_RTO_TIME / TCP_SLOW_INTERVAL;
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pcb->rtime = -1;
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pcb->rtime = -1;
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pcb->cwnd = 1;
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pcb->cwnd = 1;
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pcb->tmr = tcp_ticks;
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pcb->tmr = tcp_ticks;
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@ -1337,6 +1337,15 @@
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#define TCP_CALCULATE_EFF_SEND_MSS 1
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#define TCP_CALCULATE_EFF_SEND_MSS 1
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#endif
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#endif
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/**
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* LWIP_TCP_RTO_TIME: Initial TCP retransmission timeout (ms).
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* This defaults to 3 seconds as traditionally defined in the TCP protocol.
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* For improving timely recovery on faster networks, this value could
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* be lowered down to 1 second (RFC 6298)
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*/
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#if !defined LWIP_TCP_RTO_TIME || defined __DOXYGEN__
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#define LWIP_TCP_RTO_TIME 3000
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#endif
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/**
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/**
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* TCP_SND_BUF: TCP sender buffer space (bytes).
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* TCP_SND_BUF: TCP sender buffer space (bytes).
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