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cns3xxx: fix mtu setting with kernel 4.14 

Since kernel 4.10 commit 61e84623ace3 ("net: centralize net_device
min/max MTU checking"), the range of mtu is [min_mtu, max_mtu], which
is [68, 1500] by default.

It's necessary to set a max_mtu if a mtu > 1500 is supported.

Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>
openwrt-18.06
Mathias Kresin 2018-02-18 22:48:44 +01:00 committed by Koen Vandeputte
parent 705262f4d3
commit 50dbaee55c
1 changed files with 1 additions and 10 deletions
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11
target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
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@ -1112,22 +1112,12 @@ static int eth_set_mac(struct net_device *netdev, void *p)
return 0;
}
static int cns3xxx_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu > MAX_MTU)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static const struct net_device_ops cns3xxx_netdev_ops = {
.ndo_open = eth_open,
.ndo_stop = eth_close,
.ndo_start_xmit = eth_xmit,
.ndo_set_rx_mode = eth_rx_mode,
.ndo_do_ioctl = eth_ioctl,
.ndo_change_mtu = cns3xxx_change_mtu,
.ndo_set_mac_address = eth_set_mac,
.ndo_validate_addr = eth_validate_addr,
};
@ -1224,6 +1214,7 @@ static int eth_init_one(struct platform_device *pdev)
dev->netdev_ops = &cns3xxx_netdev_ops;
dev->ethtool_ops = &cns3xxx_ethtool_ops;
dev->tx_queue_len = 1000;
dev->max_mtu = MAX_MTU;
dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST;
switch_port_tab[port->id] = port;