ar71xx: allow mtu > 1500 based on the configured tx/rx mtu register value

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37748 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index 50029ff..5913bb6 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -1042,13 +1042,22 @@ static void ag71xx_netpoll(struct net_device *dev)
 }
 #endif
 
+static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
+{
+       if (new_mtu < 68 ||
+           new_mtu > AG71XX_TX_MTU_LEN - ETH_HLEN - ETH_FCS_LEN)
+               return -EINVAL;
+
+       dev->mtu = new_mtu;
+}
+
 static const struct net_device_ops ag71xx_netdev_ops = {
        .ndo_open               = ag71xx_open,
        .ndo_stop               = ag71xx_stop,
        .ndo_start_xmit         = ag71xx_hard_start_xmit,
        .ndo_do_ioctl           = ag71xx_do_ioctl,
        .ndo_tx_timeout         = ag71xx_tx_timeout,
-       .ndo_change_mtu         = eth_change_mtu,
+       .ndo_change_mtu         = ag71xx_change_mtu,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
 #ifdef CONFIG_NET_POLL_CONTROLLER