net: pch_gbe: convert to use ndo_hwtstamp callbacks

The driver implemented SIOCSHWTSTAMP ioctl command only, but it stores
configuration in the private data, so it is possible to report it back
to users. Implement both ndo_hwtstamp_set and ndo_hwtstamp_get
callbacks. To properly report RX filter type, store it in hwts_rx_en
instead of using this field as a simple flag. The logic didn't change
because receive path used this field as boolean flag.

Signed-off-by: Vadim Fedorenko <[e-mail]>
Reviewed-by: Kory Maincent <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c

···
 	pch_ch_event_write(pdev, TX_SNAPSHOT_LOCKED);
 }
 
-static int hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+static int pch_gbe_hwtstamp_set(struct net_device *netdev,
+				struct kernel_hwtstamp_config *cfg,
+				struct netlink_ext_ack *extack)
 {
-	struct hwtstamp_config cfg;
 	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
 	struct pci_dev *pdev;
 	u8 station[20];
 
-	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
-		return -EFAULT;
-
 	/* Get ieee1588's dev information */
 	pdev = adapter->ptp_pdev;
 
-	if (cfg.tx_type != HWTSTAMP_TX_OFF && cfg.tx_type != HWTSTAMP_TX_ON)
+	if (cfg->tx_type != HWTSTAMP_TX_OFF && cfg->tx_type != HWTSTAMP_TX_ON)
 		return -ERANGE;
 
-	switch (cfg.rx_filter) {
+	switch (cfg->rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
 		adapter->hwts_rx_en = 0;
 		break;
···
 		pch_ch_control_write(pdev, SLAVE_MODE | CAP_MODE0);
 		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
-		adapter->hwts_rx_en = 1;
+		adapter->hwts_rx_en = cfg->rx_filter;
 		pch_ch_control_write(pdev, MASTER_MODE | CAP_MODE0);
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
-		adapter->hwts_rx_en = 1;
+		adapter->hwts_rx_en = cfg->rx_filter;
 		pch_ch_control_write(pdev, V2_MODE | CAP_MODE2);
 		strcpy(station, PTP_L4_MULTICAST_SA);
 		pch_set_station_address(station, pdev);
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
-		adapter->hwts_rx_en = 1;
+		adapter->hwts_rx_en = cfg->rx_filter;
 		pch_ch_control_write(pdev, V2_MODE | CAP_MODE2);
 		strcpy(station, PTP_L2_MULTICAST_SA);
 		pch_set_station_address(station, pdev);
···
 		return -ERANGE;
 	}
 
-	adapter->hwts_tx_en = cfg.tx_type == HWTSTAMP_TX_ON;
+	adapter->hwts_tx_en = cfg->tx_type == HWTSTAMP_TX_ON;
 
 	/* Clear out any old time stamps. */
 	pch_ch_event_write(pdev, TX_SNAPSHOT_LOCKED | RX_SNAPSHOT_LOCKED);
 
-	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
+	return 0;
+}
+
+static int pch_gbe_hwtstamp_get(struct net_device *netdev,
+				struct kernel_hwtstamp_config *cfg)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	cfg->tx_type = adapter->hwts_tx_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
+	cfg->rx_filter = adapter->hwts_rx_en;
+
+	return 0;
 }
 
 static inline void pch_gbe_mac_load_mac_addr(struct pch_gbe_hw *hw)
···
 
 	netdev_dbg(netdev, "cmd : 0x%04x\n", cmd);
 
-	if (cmd == SIOCSHWTSTAMP)
-		return hwtstamp_ioctl(netdev, ifr, cmd);
-
 	return generic_mii_ioctl(&adapter->mii, if_mii(ifr), cmd, NULL);
 }
 
···
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = pch_gbe_netpoll,
 #endif
+	.ndo_hwtstamp_get = pch_gbe_hwtstamp_get,
+	.ndo_hwtstamp_set = pch_gbe_hwtstamp_set,
 };
 
 static pci_ers_result_t pch_gbe_io_error_detected(struct pci_dev *pdev,