D7924.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
	@@ -435,6 +435,8 @@
	struct ndis_rssprm_toeplitz *rss = &sc->hn_rss;
	int i;

	+ KASSERT(nchan > 1, ("invalid # of channels %d", nchan));
	+
	/*
	* Check indirect table to make sure that all channels in it
	* can be used.
	@@ -2145,7 +2147,12 @@
	if (error)
	goto back;

	- error = hn_rss_reconfig(sc);
	+ if (sc->hn_rx_ring_inuse > 1) {
	+ error = hn_rss_reconfig(sc);
	+ } else {
	+ /* Not RSS capable, at least for now; just save the RSS key. */
	+ error = 0;
	+ }
	back:
	HN_UNLOCK(sc);
	return (error);
	@@ -2163,6 +2170,15 @@
	if (error \|\| req->newptr == NULL)
	goto back;

	+ /*
	+ * Don't allow RSS indirect table change, if this interface is not
	+ * RSS capable currently.
	+ */
	+ if (sc->hn_rx_ring_inuse == 1) {
	+ error = EOPNOTSUPP;
	+ goto back;
	+ }
	+
	error = SYSCTL_IN(req, sc->hn_rss.rss_ind, sizeof(sc->hn_rss.rss_ind));
	if (error)
	goto back;