D48971.id150918.diff
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D48971.id150918.diff
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	diff --git a/sys/dev/gve/gve_main.c b/sys/dev/gve/gve_main.c
	--- a/sys/dev/gve/gve_main.c
	+++ b/sys/dev/gve/gve_main.c
	@@ -196,6 +196,8 @@
	gve_set_mtu(if_t ifp, uint32_t new_mtu)
	{
	struct gve_priv *priv = if_getsoftc(ifp);
	+ const uint32_t max_problem_range = 8227;
	+ const uint32_t min_problem_range = 7822;
	int err;

	if ((new_mtu > priv->max_mtu) \|\| (new_mtu < ETHERMIN)) {
	@@ -204,6 +206,19 @@
	return (EINVAL);
	}

	+ /*
	+ * When hardware LRO is enabled in DQ mode, MTUs within the range
	+ * [7822, 8227] trigger hardware issues which cause a drastic drop
	+ * in throughput.
	+ */
	+ if (!gve_is_gqi(priv) && !gve_disable_hw_lro &&
	+ new_mtu >= min_problem_range && new_mtu <= max_problem_range) {
	+ device_printf(priv->dev,
	+ "Cannot set to MTU to %d within the range [%d, %d] while hardware LRO is enabled\n",
	+ new_mtu, min_problem_range, max_problem_range);
	+ return (EINVAL);
	+ }
	+
	err = gve_adminq_set_mtu(priv, new_mtu);
	if (err == 0) {
	if (bootverbose)