From owner-svn-src-all@FreeBSD.ORG  Tue Nov 17 16:18:03 2009
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7623E10656A5;
	Tue, 17 Nov 2009 16:18:03 +0000 (UTC) (envelope-from jhb@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 643B98FC39;
	Tue, 17 Nov 2009 16:18:03 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id nAHGI3LE020989;
	Tue, 17 Nov 2009 16:18:03 GMT (envelope-from jhb@svn.freebsd.org)
Received: (from jhb@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id nAHGI3YA020987;
	Tue, 17 Nov 2009 16:18:03 GMT (envelope-from jhb@svn.freebsd.org)
Message-Id: <200911171618.nAHGI3YA020987@svn.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 17 Nov 2009 16:18:03 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-stable@freebsd.org, svn-src-stable-6@freebsd.org
X-SVN-Group: stable-6
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r199403 - stable/6/sys/netinet
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 17 Nov 2009 16:18:03 -0000

Author: jhb
Date: Tue Nov 17 16:18:03 2009
New Revision: 199403
URL: http://svn.freebsd.org/changeset/base/199403

Log:
  MFC 198990:
  Several years ago a feature was added to TCP that casued soreceive() to
  send an ACK right away if data was drained from a TCP socket that had
  previously advertised a zero-sized window.  The current code requires the
  receive window to be exactly zero for this to kick in.  If window scaling is
  enabled and the window is smaller than the scale, then the effective window
  that is advertised is zero.  However, in that case the zero-sized window
  handling is not enabled because the window is not exactly zero.  The fix
  changes the code to check the raw window value against zero.

Modified:
  stable/6/sys/netinet/tcp_output.c
Directory Properties:
  stable/6/sys/   (props changed)
  stable/6/sys/conf/   (props changed)
  stable/6/sys/contrib/pf/   (props changed)
  stable/6/sys/dev/cxgb/   (props changed)

Modified: stable/6/sys/netinet/tcp_output.c
==============================================================================
--- stable/6/sys/netinet/tcp_output.c	Tue Nov 17 16:17:44 2009	(r199402)
+++ stable/6/sys/netinet/tcp_output.c	Tue Nov 17 16:18:03 2009	(r199403)
@@ -893,7 +893,7 @@ send:
 	 * to read more data then can be buffered prior to transmitting on
 	 * the connection.
 	 */
-	if (recwin == 0)
+	if (th->th_win == 0)
 		tp->t_flags |= TF_RXWIN0SENT;
 	else
 		tp->t_flags &= ~TF_RXWIN0SENT;