D7916.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
	@@ -428,6 +428,26 @@
	return (0);
	}

	+static void
	+hn_rss_ind_fixup(struct hn_softc *sc, int nchan)
	+{
	+ struct ndis_rssprm_toeplitz *rss = &sc->hn_rss;
	+ int i;
	+
	+ /*
	+ * Check indirect table to make sure that all channels in it
	+ * can be used.
	+ */
	+ for (i = 0; i < NDIS_HASH_INDCNT; ++i) {
	+ if (rss->rss_ind[i] >= nchan) {
	+ if_printf(sc->hn_ifp,
	+ "RSS indirect table %d fixup: %u -> %d\n",
	+ i, rss->rss_ind[i], nchan - 1);
	+ rss->rss_ind[i] = nchan - 1;
	+ }
	+ }
	+}
	+
	static int
	hn_ifmedia_upd(struct ifnet *ifp __unused)
	{
	@@ -2112,6 +2132,7 @@
	if (error)
	goto back;

	+ hn_rss_ind_fixup(sc, sc->hn_rx_ring_inuse);
	error = hn_rss_reconfig(sc);
	back:
	HN_UNLOCK(sc);
	@@ -3265,6 +3286,13 @@
	/* TODO: Take ndis_rss_caps.ndis_nind into account. */
	for (i = 0; i < NDIS_HASH_INDCNT; ++i)
	rss->rss_ind[i] = i % nchan;
	+ } else {
	+ /*
	+ * # of usable channels may be changed, so we have to
	+ * make sure that all entries in RSS indirect table
	+ * are valid.
	+ */
	+ hn_rss_ind_fixup(sc, nchan);
	}

	error = hn_rndis_conf_rss(sc, NDIS_RSS_FLAG_NONE);