[lwip-devel] [bug #19434] Processing of Fast retransmit bug

[Oleg Tyshev]

Follow-up Comment #11, bug #19434 (project lwip):

I have reviewed patch once more.

It looks fine,
but it is necessary to implement retransmission timer stop
(rtime=-1 when all outstanding data has been acknowledged)
or in following scenario we have extra retransmission:

node1       node2
-----------------------
            <-data1
                [(rtime started)]
ACK data1->
                [(rtime restarted)]
 tcp_slowtmr - ++rtime
 tcp_slowtmr - ++rtime
 ...
 tcp_slowtmr - ++rtime

            <-data2
with first tick of tcp_slowtmr
   if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) -->
       [(retransmit data2)]


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