D7889.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
	@@ -3159,13 +3159,25 @@
	* are allocated.
	*/

	- /* Setup default RSS key. */
	- memcpy(rss->rss_key, hn_rss_key_default, sizeof(rss->rss_key));
	+ if (!device_is_attached(sc->hn_dev)) {
	+ /*
	+ * Setup default RSS key and indirect table for the
	+ * attach DEVMETHOD. They can be altered later on,
	+ * so don't mess them up once this interface is attached.
	+ */
	+ if (bootverbose) {
	+ if_printf(sc->hn_ifp, "setup default RSS key and "
	+ "indirect table\n");
	+ }
	+
	+ /* Setup default RSS key. */
	+ memcpy(rss->rss_key, hn_rss_key_default, sizeof(rss->rss_key));

	- /* Setup default RSS indirect table. */
	- /* TODO: Take ndis_rss_caps.ndis_nind into account. */
	- for (i = 0; i < NDIS_HASH_INDCNT; ++i)
	- rss->rss_ind[i] = i % nchan;
	+ /* Setup default RSS indirect table. */
	+ /* TODO: Take ndis_rss_caps.ndis_nind into account. */
	+ for (i = 0; i < NDIS_HASH_INDCNT; ++i)
	+ rss->rss_ind[i] = i % nchan;
	+ }

	error = hn_rndis_conf_rss(sc);
	if (error) {