D7872.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
	@@ -232,12 +232,10 @@
	"Trust ip packet verification on host side, "
	"when csum info is missing (global setting)");

	-#if __FreeBSD_version >= 1100045
	/* Limit TSO burst size */
	static int hn_tso_maxlen = 0;
	SYSCTL_INT(_hw_hn, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
	&hn_tso_maxlen, 0, "TSO burst limit");
	-#endif

	/* Limit chimney send size */
	static int hn_tx_chimney_size = 0;
	@@ -452,9 +450,7 @@
	uint32_t link_status;
	struct ifnet *ifp = NULL;
	int error, ring_cnt, tx_ring_cnt;
	-#if __FreeBSD_version >= 1100045
	int tso_maxlen;
	-#endif

	sc->hn_dev = dev;
	sc->hn_prichan = vmbus_get_channel(dev);
	@@ -587,7 +583,6 @@
	if (link_status == NDIS_MEDIA_STATE_CONNECTED)
	sc->hn_carrier = 1;

	-#if __FreeBSD_version >= 1100045
	tso_maxlen = hn_tso_maxlen;
	if (tso_maxlen <= 0 \|\| tso_maxlen > IP_MAXPACKET)
	tso_maxlen = IP_MAXPACKET;
	@@ -596,17 +591,14 @@
	ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
	ifp->if_hw_tsomax = tso_maxlen -
	(ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
	-#endif

	error = hn_rndis_get_eaddr(sc, eaddr);
	if (error)
	goto failed;
	ether_ifattach(ifp, eaddr);

	-#if __FreeBSD_version >= 1100045
	if_printf(ifp, "TSO: %u/%u/%u\n", ifp->if_hw_tsomax,
	ifp->if_hw_tsomaxsegcount, ifp->if_hw_tsomaxsegsize);
	-#endif

	hn_set_chim_size(sc, sc->hn_chim_szmax);
	if (hn_tx_chimney_size > 0 &&