D9101.id23768.diff
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	Index: sys/dev/hyperv/netvsc/if_hn.c
	===================================================================
	--- sys/dev/hyperv/netvsc/if_hn.c
	+++ 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;