--- zzzz-none-000/linux-4.9.279/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c	2023-02-08 11:43:42.000000000 +0000
@@ -2505,8 +2505,6 @@
 	int ret;
 	struct port_info *pi = netdev_priv(dev);
 
-	if (new_mtu < 81 || new_mtu > MAX_MTU)         /* accommodate SACK */
-		return -EINVAL;
 	ret = t4_set_rxmode(pi->adapter, pi->adapter->pf, pi->viid, new_mtu, -1,
 			    -1, -1, -1, true);
 	if (!ret)
@@ -4820,6 +4818,10 @@
 
 		netdev->priv_flags |= IFF_UNICAST_FLT;
 
+		/* MTU range: 81 - 9600 */
+		netdev->min_mtu = 81;
+		netdev->max_mtu = MAX_MTU;
+
 		netdev->netdev_ops = &cxgb4_netdev_ops;
 #ifdef CONFIG_CHELSIO_T4_DCB
 		netdev->dcbnl_ops = &cxgb4_dcb_ops;