diff options
Diffstat (limited to 'drivers/net/ethernet/realtek/8139too.c')
| -rw-r--r-- | drivers/net/ethernet/realtek/8139too.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c index 007b38cce69a..8387de985c06 100644 --- a/drivers/net/ethernet/realtek/8139too.c +++ b/drivers/net/ethernet/realtek/8139too.c @@ -185,6 +185,9 @@ static int debug = -1; /* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/ #define MAX_ETH_FRAME_SIZE 1536 +/* max supported payload size */ +#define MAX_ETH_DATA_SIZE (MAX_ETH_FRAME_SIZE - ETH_HLEN - ETH_FCS_LEN) + /* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */ #define TX_BUF_SIZE MAX_ETH_FRAME_SIZE #define TX_BUF_TOT_LEN (TX_BUF_SIZE * NUM_TX_DESC) @@ -920,11 +923,19 @@ static int rtl8139_set_features(struct net_device *dev, netdev_features_t featur return 0; } +static int rtl8139_change_mtu(struct net_device *dev, int new_mtu) +{ + if (new_mtu < 68 || new_mtu > MAX_ETH_DATA_SIZE) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + static const struct net_device_ops rtl8139_netdev_ops = { .ndo_open = rtl8139_open, .ndo_stop = rtl8139_close, .ndo_get_stats64 = rtl8139_get_stats64, - .ndo_change_mtu = eth_change_mtu, + .ndo_change_mtu = rtl8139_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = rtl8139_set_mac_address, .ndo_start_xmit = rtl8139_start_xmit, |