[lwip-devel] [bug #54160] tcp_pcb_purge() and snd_queuelen

[Robert Reither]

URL:
  <http://savannah.nongnu.org/bugs/?54160>

                 Summary: tcp_pcb_purge() and snd_queuelen
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: nathan2225
            Submitted on: Thu 21 Jun 2018 07:58:37 AM UTC
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 1.3.0

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Details:

Hi, I was playing around a little bit with that function (to clean up after
congestion due to blocked client side of connection and was wondering how this
should work.
I'm still stuck on lwip 1.3.0, but afaics, this code was not changed up to
2.0.3

If I call the func, all unsent and unacked packets were removed, but the sum
of these packages (kept in the var snd_queuelen) was not reseted.
So after calling, I still cannot add new packets to the connection, because
snd_queuelen is still at max (TCP_SND_QUEUELEN)

maybe we need here

pcb->snd_queuelen = 0;

Regards
Robert




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