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From: Michael Tuexen <tuexen@FreeBSD.org>
Date: Sun, 1 Dec 2019 17:35:37 +0000 (UTC)
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Subject: svn commit: r355265 - head/sys/netinet
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Author: tuexen
Date: Sun Dec  1 17:35:36 2019
New Revision: 355265
URL: https://svnweb.freebsd.org/changeset/base/355265

Log:
  When changing the MTU of an SCTP path, not only cancel all ongoing
  RTT measurements, but also scheldule new ones for the future.
  
  Submitted by:		Julius Flohr
  MFC after:		1 week
  Differential Revision:	https://reviews.freebsd.org/D22547

Modified:
  head/sys/netinet/sctp_usrreq.c

Modified: head/sys/netinet/sctp_usrreq.c
==============================================================================
--- head/sys/netinet/sctp_usrreq.c	Sun Dec  1 16:14:44 2019	(r355264)
+++ head/sys/netinet/sctp_usrreq.c	Sun Dec  1 17:35:36 2019	(r355265)
@@ -143,7 +143,10 @@ sctp_pathmtu_adjustment(struct sctp_tcb *stcb, uint16_
 					    chk->rec.data.tsn);
 				}
 				/* Clear any time so NO RTT is being done */
-				chk->do_rtt = 0;
+				if (chk->do_rtt == 1) {
+					chk->do_rtt = 0;
+					chk->whoTo->rto_needed = 1;
+				}
 			}
 		}
 	}