D3086.id7165.diff
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	Index: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
	===================================================================
	--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
	+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
	@@ -343,7 +343,15 @@
	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 @@
	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;
	+ }
	}
	}