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From: Rui Paulo <rpaulo@FreeBSD.org>
Date: Sat, 10 Apr 2010 12:47:06 +0000 (UTC)
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Subject: svn commit: r206456 - head/sys/netinet
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Author: rpaulo
Date: Sat Apr 10 12:47:06 2010
New Revision: 206456
URL: http://svn.freebsd.org/changeset/base/206456

Log:
  Honor the CE bit even when the CWR bit is set.
  
  PR:		145600
  Submitted by:	Richard Scheffenegger <rs at netapp.com>
  MFC after:	1 week

Modified:
  head/sys/netinet/tcp_input.c

Modified: head/sys/netinet/tcp_input.c
==============================================================================
--- head/sys/netinet/tcp_input.c	Sat Apr 10 12:29:09 2010	(r206455)
+++ head/sys/netinet/tcp_input.c	Sat Apr 10 12:47:06 2010	(r206456)
@@ -1134,6 +1134,8 @@ tcp_do_segment(struct mbuf *m, struct tc
 	 * TCP ECN processing.
 	 */
 	if (tp->t_flags & TF_ECN_PERMIT) {
+		if (thflags & TH_CWR)
+			tp->t_flags &= ~TF_ECN_SND_ECE;
 		switch (iptos & IPTOS_ECN_MASK) {
 		case IPTOS_ECN_CE:
 			tp->t_flags |= TF_ECN_SND_ECE;
@@ -1146,10 +1148,6 @@ tcp_do_segment(struct mbuf *m, struct tc
 			TCPSTAT_INC(tcps_ecn_ect1);
 			break;
 		}
-
-		if (thflags & TH_CWR)
-			tp->t_flags &= ~TF_ECN_SND_ECE;
-
 		/*
 		 * Congestion experienced.
 		 * Ignore if we are already trying to recover.