D4131.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
	@@ -128,6 +128,15 @@
	#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 @@
	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;
	}