[lwip-commits] [SCM] lwIP - A Lightweight TCPIP stack branch, master, updated. f79eabd24b0b266d0263b331afdc4df1fc545e22

[Joel Cunningham]

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- Log -----------------------------------------------------------------
commit f79eabd24b0b266d0263b331afdc4df1fc545e22
Author: Joel Cunningham <address@hidden>
Date:   Mon Nov 14 15:31:57 2016 -0600

    bug #49533: start persist timer when unsent seg can't fit in window
    
    This commit returns LwIP to previous behavior where if the next unsent
    segment can't be sent due to the current send window, we start the
    persist timer. This is done to engage window probing in the case that
    the subsequent window update from the receiver is dropped, thus
    preventing connection deadlock
    
    This commit refines the previous logic to only target the following case:
     1) Next unsent segment doesn't fit within the send window (not
        congestion) and there is some room in the window
     2) Unacked queue is empty (otherwise data is inflight and the RTO timer
        will take care of any dropped window updates)
    
    See commit d8f090a7595a79050c435545d00efc1261b9691c (which removed this
    behavior) to reference the old logic. The old logic falsely started the
    persit timer when the RTO timer was already running.

-----------------------------------------------------------------------

Summary of changes:
 src/core/tcp_out.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)


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