dev_validate_mtu 3671 include/linux/netdevice.h int dev_validate_mtu(struct net_device *dev, int mtu, dev_validate_mtu 8005 net/core/dev.c err = dev_validate_mtu(dev, new_mtu, extack); dev_validate_mtu 2966 net/core/rtnetlink.c err = dev_validate_mtu(dev, mtu, extack);