SIOCGIFMTU 543 fs/compat_ioctl.c case SIOCGIFMTU: SIOCGIFMTU 2544 fs/compat_ioctl.c HANDLE_IOCTL(SIOCGIFMTU, dev_ifsioc) SIOCGIFMTU 3522 net/core/dev.c case SIOCGIFMTU: /* Get the MTU of a device */ SIOCGIFMTU 3730 net/core/dev.c case SIOCGIFMTU: