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tcp: Make retransmission timeout (RTO) configurable

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This commit is contained in:
yuanjm 2020-04-15 10:26:04 +08:00 committed by Erik Ekman
parent 876517ea3e
commit 239918ccc1
2 changed files with 13 additions and 2 deletions
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6
src/core/tcp.c
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@ -1901,8 +1901,10 @@ tcp_alloc(u8_t prio)
/* As initial send MSS, we use TCP_MSS but limit it to 536.
The send MSS is updated when an MSS option is received. */
pcb->mss = INITIAL_MSS;
pcb->rto = 3000 / TCP_SLOW_INTERVAL;
pcb->sv = 3000 / TCP_SLOW_INTERVAL;
/* Set initial TCP's retransmission timeout to 3000 ms by default.
This value could be configured in lwipopts */
pcb->rto = LWIP_TCP_RTO_TIME / TCP_SLOW_INTERVAL;
pcb->sv = LWIP_TCP_RTO_TIME / TCP_SLOW_INTERVAL;
pcb->rtime = -1;
pcb->cwnd = 1;
pcb->tmr = tcp_ticks;

9
src/include/lwip/opt.h
View File

@ -1337,6 +1337,15 @@
#define TCP_CALCULATE_EFF_SEND_MSS 1
#endif
/**
* LWIP_TCP_RTO_TIME: Initial TCP retransmission timeout (ms).
* This defaults to 3 seconds as traditionally defined in the TCP protocol.
* For improving timely recovery on faster networks, this value could
* be lowered down to 1 second (RFC 6298)
*/
#if !defined LWIP_TCP_RTO_TIME || defined __DOXYGEN__
#define LWIP_TCP_RTO_TIME 3000
#endif
/**
* TCP_SND_BUF: TCP sender buffer space (bytes).