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Date:      Wed, 22 Jul 2015 05:05:02 +0000 (UTC)
From:      Wei Hu <whu@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r285785 - head/sys/dev/hyperv/netvsc
Message-ID:  <201507220505.t6M552aR050318@repo.freebsd.org>
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Author: whu
Date: Wed Jul 22 05:05:01 2015
New Revision: 285785
URL: https://svnweb.freebsd.org/changeset/base/285785

Log:
  Do not enable UDP checksum offloading when running on the Hyper-V on
  Windows Server 2012 and earlier hosts.
  
  Submitted by: whu
  Reviewed by: royger
  Approved by: royger
  MFC after: 3 days
  Relnotes: No
  Sponsored by: Microsoft OSTC
  Differential Revision:  https://reviews.freebsd.org/D3086

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	Wed Jul 22 04:18:33 2015	(r285784)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Wed Jul 22 05:05:01 2015	(r285785)
@@ -343,7 +343,15 @@ netvsc_attach(device_t dev)
 	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO;
 	ifp->if_capenable |=
 	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO;
-	ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_TSO;
+	/*
+	 * Only enable UDP checksum offloading when it is on 2012R2 or
+	 * later. UDP checksum offloading doesn't work on earlier
+	 * Windows releases.
+	 */
+	if (hv_vmbus_protocal_version >= HV_VMBUS_VERSION_WIN8_1)
+		ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_TSO;
+	else
+		ifp->if_hwassist = CSUM_TCP | CSUM_TSO;
 
 	ret = hv_rf_on_device_add(device_ctx, &device_info);
 	if (ret != 0) {
@@ -1108,7 +1116,17 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, 
 				ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP);
 			} else {
 				ifp->if_capenable |= IFCAP_TXCSUM;
-				ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP);
+				/*
+				 * Only enable UDP checksum offloading on
+				 * Windows Server 2012R2 or later releases.
+				 */
+				if (hv_vmbus_protocal_version >=
+				    HV_VMBUS_VERSION_WIN8_1) {
+					ifp->if_hwassist |=
+					    (CSUM_TCP | CSUM_UDP);
+				} else {
+					ifp->if_hwassist |= CSUM_TCP;
+				}
 			}
 		}

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