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Continue fixing the spirit of bug #51663: don't change pcb state if retransmission can't be done because segments are still queued for transmission

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- add a better-documented static function tcp_output_segment_busy
- try to reduce the number of checks
- tcp_rexmit_rto: iterate pcb->unacked only once
- no need to check for ref==1 in tcp_rexmit_fast when tcp_rexmit does
- call tcp_rexmit_fast if dupacks >= 3 (not == 3) and use TF_INFR flag to guard the fast-rexmit case (that way, it's triggered again on the next dupack)
This commit is contained in:
goldsimon
2017-08-08 23:02:14 +02:00
parent 6a01607004
commit 90873d6c71
4 changed files with 126 additions and 78 deletions
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4
src/include/lwip/priv/tcp_priv.h
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@@ -79,7 +79,9 @@ void tcp_input (struct pbuf *p, struct netif *inp);
struct tcp_pcb * tcp_alloc (u8_t prio);
void tcp_abandon (struct tcp_pcb *pcb, int reset);
err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
void tcp_rexmit (struct tcp_pcb *pcb);
err_t tcp_rexmit (struct tcp_pcb *pcb);
err_t tcp_rexmit_rto_prepare(struct tcp_pcb *pcb);
void tcp_rexmit_rto_commit(struct tcp_pcb *pcb);
void tcp_rexmit_rto (struct tcp_pcb *pcb);
void tcp_rexmit_fast (struct tcp_pcb *pcb);
u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);