pve-edge-kernel/patches/intel/e1000e/e1000e_4.10_max-mtu.patch

diff --git a/src/netdev.c b/src/netdev.c
index 73b0f9a..aef1bc2 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -6724,19 +6724,12 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
 	int max_frame = new_mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
 
 	/* Jumbo frame support */
-	if ((max_frame > (VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)) &&
+	if ((new_mtu > ETH_DATA_LEN) &&
 	    !(adapter->flags & FLAG_HAS_JUMBO_FRAMES)) {
 		e_err("Jumbo Frames not supported.\n");
 		return -EINVAL;
 	}
 
-	/* Supported frame sizes */
-	if ((new_mtu < (VLAN_ETH_ZLEN + ETH_FCS_LEN)) ||
-	    (max_frame > adapter->max_hw_frame_size)) {
-		e_err("Unsupported MTU setting\n");
-		return -EINVAL;
-	}
-
 	/* Jumbo frame workaround on 82579 and newer requires CRC be stripped */
 	if ((adapter->hw.mac.type >= e1000_pch2lan) &&
 	    !(adapter->flags2 & FLAG2_CRC_STRIPPING) &&
@@ -8262,6 +8255,11 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 #endif /* HAVE_NETDEV_VLAN_FEATURES */
 	}
 
+	/* MTU range: 68 - max_hw_frame_size */
+	netdev->min_mtu = ETH_MIN_MTU;
+	netdev->max_mtu = adapter->max_hw_frame_size -
+	                  (VLAN_ETH_HLEN + ETH_FCS_LEN);
+
 	if (e1000e_enable_mng_pass_thru(&adapter->hw))
 		adapter->flags |= FLAG_MNG_PT_ENABLED;