Index: head/sys/dev/hyperv/netvsc/if_hn.c
===================================================================
--- head/sys/dev/hyperv/netvsc/if_hn.c
+++ head/sys/dev/hyperv/netvsc/if_hn.c
@@ -301,6 +301,7 @@
 static int			hn_txagg_pktmax_sysctl(SYSCTL_HANDLER_ARGS);
 static int			hn_txagg_align_sysctl(SYSCTL_HANDLER_ARGS);
 static int			hn_polling_sysctl(SYSCTL_HANDLER_ARGS);
+static int			hn_vf_sysctl(SYSCTL_HANDLER_ARGS);
 
 static void			hn_stop(struct hn_softc *, bool);
 static void			hn_init_locked(struct hn_softc *);
@@ -1254,6 +1255,9 @@
 	    CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc, 0,
 	    hn_polling_sysctl, "I",
 	    "Polling frequency: [100,1000000], 0 disable polling");
+	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "vf",
+	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
+	    hn_vf_sysctl, "A", "Virtual Function's name");
 
 	/*
 	 * Setup the ifmedia, which has been initialized earlier.
@@ -3222,6 +3226,22 @@
 }
 
 static int
+hn_vf_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	struct hn_softc *sc = arg1;
+	char vf_name[128];
+	struct ifnet *vf;
+
+	HN_LOCK(sc);
+	vf_name[0] = '\0';
+	vf = sc->hn_rx_ring[0].hn_vf;
+	if (vf != NULL)
+		snprintf(vf_name, sizeof(vf_name), "%s", if_name(vf));
+	HN_UNLOCK(sc);
+	return sysctl_handle_string(oidp, vf_name, sizeof(vf_name), req);
+}
+
+static int
 hn_check_iplen(const struct mbuf *m, int hoff)
 {
 	const struct ip *ip;