Index: sys/dev/hyperv/netvsc/hv_net_vsc.c
===================================================================
--- sys/dev/hyperv/netvsc/hv_net_vsc.c
+++ sys/dev/hyperv/netvsc/hv_net_vsc.c
@@ -536,33 +536,19 @@
 static int
 hv_nv_send_ndis_config(struct hn_softc *sc, uint32_t mtu)
 {
-	netvsc_dev *net_dev;
-	nvsp_msg *init_pkt;
-	int ret;
-
-	net_dev = hv_nv_get_outbound_net_device(sc);
-	if (!net_dev)
-		return (-ENODEV);
-
-	/*
-	 * Set up configuration packet, write MTU
-	 * Indicate we are capable of handling VLAN tags
-	 */
-	init_pkt = &net_dev->channel_init_packet;
-	memset(init_pkt, 0, sizeof(nvsp_msg));
-	init_pkt->hdr.msg_type = nvsp_msg_2_type_send_ndis_config;
-	init_pkt->msgs.vers_2_msgs.send_ndis_config.mtu = mtu;
-	init_pkt->
-		msgs.vers_2_msgs.send_ndis_config.capabilities.u1.u2.ieee8021q
-		= 1;
+	struct hn_nvs_ndis_conf conf;
+	int error;
 
-	/* Send the configuration packet */
-	ret = vmbus_chan_send(sc->hn_prichan, VMBUS_CHANPKT_TYPE_INBAND, 0,
-	    init_pkt, sizeof(nvsp_msg), (uint64_t)(uintptr_t)&hn_send_ctx_none);
-	if (ret != 0)
-		return (-EINVAL);
+	memset(&conf, 0, sizeof(conf));
+	conf.nvs_type = HN_NVS_TYPE_NDIS_CONF;
+	conf.nvs_mtu = mtu;
+	conf.nvs_caps = HN_NVS_NDIS_CONF_VLAN;
 
-	return (0);
+	error = vmbus_chan_send(sc->hn_prichan, VMBUS_CHANPKT_TYPE_INBAND, 0,
+	    &conf, sizeof(conf), (uint64_t)(uintptr_t)&hn_send_ctx_none);
+	if (error)
+		if_printf(sc->hn_ifp, "send nvs ndis conf failed: %d\n", error);
+	return (error);
 }
 
 /*
Index: sys/dev/hyperv/netvsc/if_hnreg.h
===================================================================
--- sys/dev/hyperv/netvsc/if_hnreg.h
+++ sys/dev/hyperv/netvsc/if_hnreg.h
@@ -36,6 +36,7 @@
 
 #define HN_NVS_TYPE_INIT		1
 #define HN_NVS_TYPE_INIT_RESP		2
+#define HN_NVS_TYPE_NDIS_CONF		125
 
 /*
  * Any size less than this one will _not_ work, e.g. hn_nvs_init
@@ -59,4 +60,17 @@
 	uint32_t	nvs_status;	/* HN_NVS_STATUS_ */
 } __packed;
 
+/* No reponse */
+struct hn_nvs_ndis_conf {
+	uint32_t	nvs_type;	/* HN_NVS_TYPE_NDIS_CONF */
+	uint32_t	nvs_mtu;
+	uint32_t	nvs_rsvd;
+	uint64_t	nvs_caps;	/* HN_NVS_NDIS_CONF_ */
+	uint8_t		nvs_rsvd1[12];
+} __packed;
+CTASSERT(sizeof(struct hn_nvs_ndis_conf) >= HN_NVS_REQSIZE_MIN);
+
+#define HN_NVS_NDIS_CONF_SRIOV		0x0004
+#define HN_NVS_NDIS_CONF_VLAN		0x0008
+
 #endif	/* !_IF_HNREG_H_ */