tcp: rack fails to send out a TLP after a MTU change
When rack sends out a TLP it sets up various state to make sure it avoids the cwnd (its been more than 1 RTT since our last send) and it may at times send new data. If an MTU change as occurred and our cwnd has collapsed we can have a situation where must_retran flag is set and we obey the cwnd thus never sending the TLP and then sitting stuck. This one line fix addresses that problem Reviewed by: Michael Tuexen Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D33231
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@ -17139,6 +17139,7 @@ rack_output(struct tcpcb *tp)
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len = cwin;
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}
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if (rack->r_must_retran &&
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(doing_tlp == 0) &&
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(rsm == NULL)) {
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/*
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* Non-Sack and we had a RTO or Sack/non-Sack and a
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