[PATCH net-next 10/13] net: ena: add mtu limitation in ena_change_mtu()

[netanel]

From: Netanel Belgazal <neta...@amazon.com>

Signed-off-by: Netanel Belgazal <neta...@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c 
b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 7dee448157bb..7f31f4ce7b8e 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -108,6 +108,13 @@ static int ena_change_mtu(struct net_device *dev, int 
new_mtu)
        struct ena_adapter *adapter = netdev_priv(dev);
        int ret;
 
+       if ((new_mtu > adapter->max_mtu) || (new_mtu < ENA_MIN_MTU)) {
+               netif_err(adapter, drv, dev,
+                         "Invalid MTU setting. new_mtu: %d max mtu: %d min 
mtu: %d\n",
+                         new_mtu, adapter->max_mtu, ENA_MIN_MTU);
+               return -EINVAL;
+       }
+
        ret = ena_com_set_dev_mtu(adapter->ena_dev, new_mtu);
        if (!ret) {
                netif_dbg(adapter, drv, dev, "set MTU to %d\n", new_mtu);
@@ -3008,8 +3015,6 @@ static void ena_set_conf_feat_params(struct ena_adapter 
*adapter,
        ena_set_dev_offloads(feat, netdev);
 
        adapter->max_mtu = feat->dev_attr.max_mtu;
-       netdev->max_mtu = adapter->max_mtu;
-       netdev->min_mtu = ENA_MIN_MTU;
 }
 
 static int ena_rss_init_default(struct ena_adapter *adapter)
-- 
2.7.4