dev_get_hwtstamp_phylib
int dev_get_hwtstamp_phylib(struct net_device *dev,
err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
err = dev_get_hwtstamp_phylib(dev, kernel_cfg);
ret = dev_get_hwtstamp_phylib(dev, &hwtst_config);
ret = dev_get_hwtstamp_phylib(dev, &cfg);