From owner-svn-src-head@freebsd.org  Sun Nov 22 05:26:15 2015
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2B86DA354DE;
 Sun, 22 Nov 2015 05:26:15 +0000 (UTC) (envelope-from whu@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id DE4331309;
 Sun, 22 Nov 2015 05:26:14 +0000 (UTC) (envelope-from whu@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id tAM5QDa6046030;
 Sun, 22 Nov 2015 05:26:13 GMT (envelope-from whu@FreeBSD.org)
Received: (from whu@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id tAM5QDAD046029;
 Sun, 22 Nov 2015 05:26:13 GMT (envelope-from whu@FreeBSD.org)
Message-Id: <201511220526.tAM5QDAD046029@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: whu set sender to whu@FreeBSD.org
 using -f
From: Wei Hu <whu@FreeBSD.org>
Date: Sun, 22 Nov 2015 05:26:13 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r291156 - head/sys/dev/hyperv/netvsc
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 22 Nov 2015 05:26:15 -0000

Author: whu
Date: Sun Nov 22 05:26:13 2015
New Revision: 291156
URL: https://svnweb.freebsd.org/changeset/base/291156

Log:
  Ignore the inbound checksum flags when doing packet forwarding in netvsc driver.
  
  PR: 20363
  Submitted by: whu
  Reviewed by: royger, whu
  Approved by: royger
  MFC after: 1 week
  Relnotes: No
  Sponsored by: Microsoft OSTC
  Differential Revision:  https://reviews.freebsd.org/D4131

Modified:
  head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c

Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Sun Nov 22 02:43:14 2015	(r291155)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Sun Nov 22 05:26:13 2015	(r291156)
@@ -128,6 +128,15 @@ __FBSDID("$FreeBSD$");
 #define HV_NV_SC_PTR_OFFSET_IN_BUF         0
 #define HV_NV_PACKET_OFFSET_IN_BUF         16
 
+/*
+ * A unified flag for all outbound check sum flags is useful,
+ * and it helps avoiding unnecessary check sum calculation in
+ * network forwarding scenario.
+ */
+#define HV_CSUM_FOR_OUTBOUND						\
+    (CSUM_IP|CSUM_IP_UDP|CSUM_IP_TCP|CSUM_IP_SCTP|CSUM_IP_TSO|		\
+    CSUM_IP_ISCSI|CSUM_IP6_UDP|CSUM_IP6_TCP|CSUM_IP6_SCTP|		\
+    CSUM_IP6_TSO|CSUM_IP6_ISCSI)
 
 /*
  * Data types
@@ -570,7 +579,8 @@ hn_start_locked(struct ifnet *ifp)
 			    packet->vlan_tci & 0xfff;
 		}
 
-		if (0 == m_head->m_pkthdr.csum_flags) {
+		/* Only check the flags for outbound and ignore the ones for inbound */
+		if (0 == (m_head->m_pkthdr.csum_flags & HV_CSUM_FOR_OUTBOUND)) {
 			goto pre_send;
 		}