Merge tag 'linux-can-next-for-5.20-20220731' of...

Merge tag 'linux-can-next-for-5.20-20220731' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
Marc Kleine-Budde says:

====================
pull-request: can-next 2022-07-31

this is a pull request of 36 patches for net-next/master.

The 1st patch is by me and fixes a typo in the mcp251xfd driver.

Vincent Mailhol contributes a series of 9 patches, which clean up the
drivers to make use of KBUILD_MODNAME instead of hard coded names and
remove DRV_VERSION.

Followed by 3 patches by Vincent Mailhol that directly set the
ethtool_ops in instead of calling a function in the slcan, c_can and
flexcan driver.

Vincent Mailhol contributes a KBUILD_MODNAME and pr_fmt cleanup patch
for the slcan driver. Dario Binacchi contributes 6 patches to clean up
the driver and remove the legacy driver infrastructure.

The next 14 patches are by Vincent Mailhol and target the various
drivers, they add ethtool support and reporting of timestamping
capabilities.

Another patch by Vincent Mailhol for the etas_es58x driver to remove
useless calls to usb_fill_bulk_urb().

The last patch is by Christophe JAILLET and fixes a broken link to
Documentation in the can327 driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -18470,6 +18470,12 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git
 F:	include/linux/sl?b*.h
 F:	mm/sl?b*
 
+SLCAN CAN NETWORK DRIVER
+M:	Dario Binacchi <dario.binacchi@amarulasolutions.com>
+L:	linux-can@vger.kernel.org
+S:	Maintained
+F:	drivers/net/can/slcan/
+
 SLEEPABLE READ-COPY UPDATE (SRCU)
 M:	Lai Jiangshan <jiangshanlai@gmail.com>
 M:	"Paul E. McKenney" <paulmck@kernel.org>

drivers/net/can/at91_can.c

@@ -8,6 +8,7 @@
 
 #include <linux/clk.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/if_arp.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -1152,6 +1153,10 @@ static const struct net_device_ops at91_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops at91_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static ssize_t mb0_id_show(struct device *dev,
 			   struct device_attribute *attr, char *buf)
 {
@@ -1293,6 +1298,7 @@ static int at91_can_probe(struct platform_device *pdev)
 	}
 
 	dev->netdev_ops	= &at91_netdev_ops;
+	dev->ethtool_ops = &at91_ethtool_ops;
 	dev->irq = irq;
 	dev->flags |= IFF_ECHO;
 

drivers/net/can/c_can/c_can.h

@@ -223,7 +223,7 @@ int c_can_power_up(struct net_device *dev);
 int c_can_power_down(struct net_device *dev);
 #endif
 
-void c_can_set_ethtool_ops(struct net_device *dev);
+extern const struct ethtool_ops c_can_ethtool_ops;
 
 static inline u8 c_can_get_tx_head(const struct c_can_tx_ring *ring)
 {

drivers/net/can/c_can/c_can_ethtool.c

@@ -24,11 +24,7 @@ static void c_can_get_ringparam(struct net_device *netdev,
 	ring->tx_pending = priv->msg_obj_tx_num;
 }
 
-static const struct ethtool_ops c_can_ethtool_ops = {
+const struct ethtool_ops c_can_ethtool_ops = {
 	.get_ringparam = c_can_get_ringparam,
+	.get_ts_info = ethtool_op_get_ts_info,
 };
-
-void c_can_set_ethtool_ops(struct net_device *netdev)
-{
-	netdev->ethtool_ops = &c_can_ethtool_ops;
-}

drivers/net/can/c_can/c_can_main.c

@@ -1364,7 +1364,7 @@ int register_c_can_dev(struct net_device *dev)
 
 	dev->flags |= IFF_ECHO;	/* we support local echo */
 	dev->netdev_ops = &c_can_netdev_ops;
-	c_can_set_ethtool_ops(dev);
+	dev->ethtool_ops = &c_can_ethtool_ops;
 
 	return register_candev(dev);
 }

drivers/net/can/can327.c

@@ -10,7 +10,7 @@
  *                   Fred N. van Kempen <waltje@uwalt.nl.mugnet.org>
  */
 
-#define pr_fmt(fmt) "can327: " fmt
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/init.h>
 #include <linux/module.h>
@@ -827,7 +827,7 @@ static netdev_tx_t can327_netdev_start_xmit(struct sk_buff *skb,
 	netif_stop_queue(dev);
 
 	/* BHs are already disabled, so no spin_lock_bh().
-	 * See Documentation/networking/netdevices.txt
+	 * See Documentation/networking/netdevices.rst
 	 */
 	spin_lock(&elm->lock);
 	can327_send_frame(elm, frame);
@@ -836,6 +836,8 @@ static netdev_tx_t can327_netdev_start_xmit(struct sk_buff *skb,
 	dev->stats.tx_packets++;
 	dev->stats.tx_bytes += frame->can_id & CAN_RTR_FLAG ? 0 : frame->len;
 
+	skb_tx_timestamp(skb);
+
 out:
 	kfree_skb(skb);
 	return NETDEV_TX_OK;
@@ -848,6 +850,10 @@ static const struct net_device_ops can327_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops can327_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static bool can327_is_valid_rx_char(u8 c)
 {
 	static const bool lut_char_is_valid['z'] = {
@@ -1032,6 +1038,7 @@ static int can327_ldisc_open(struct tty_struct *tty)
 	/* Configure netdev interface */
 	elm->dev = dev;
 	dev->netdev_ops = &can327_netdev_ops;
+	dev->ethtool_ops = &can327_ethtool_ops;
 
 	/* Mark ldisc channel as alive */
 	elm->tty = tty;
@@ -1100,7 +1107,7 @@ static int can327_ldisc_ioctl(struct tty_struct *tty, unsigned int cmd,
 
 static struct tty_ldisc_ops can327_ldisc = {
 	.owner = THIS_MODULE,
-	.name = "can327",
+	.name = KBUILD_MODNAME,
 	.num = N_CAN327,
 	.receive_buf = can327_ldisc_rx,
 	.write_wakeup = can327_ldisc_tx_wakeup,

drivers/net/can/cc770/cc770.c

@@ -17,6 +17,7 @@
 #include <linux/ptrace.h>
 #include <linux/string.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/if_ether.h>
@@ -836,6 +837,10 @@ static const struct net_device_ops cc770_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops cc770_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 int register_cc770dev(struct net_device *dev)
 {
 	struct cc770_priv *priv = netdev_priv(dev);
@@ -846,6 +851,7 @@ int register_cc770dev(struct net_device *dev)
 		return err;
 
 	dev->netdev_ops = &cc770_netdev_ops;
+	dev->ethtool_ops = &cc770_ethtool_ops;
 
 	dev->flags |= IFF_ECHO;	/* we support local echo */
 

drivers/net/can/ctucanfd/ctucanfd_base.c

@@ -19,6 +19,7 @@
 
 #include <linux/clk.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/init.h>
 #include <linux/bitfield.h>
 #include <linux/interrupt.h>
@@ -1301,6 +1302,10 @@ static const struct net_device_ops ctucan_netdev_ops = {
 	.ndo_change_mtu	= can_change_mtu,
 };
 
+static const struct ethtool_ops ctucan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 int ctucan_suspend(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
@@ -1377,6 +1382,7 @@ int ctucan_probe_common(struct device *dev, void __iomem *addr, int irq, unsigne
 		set_drvdata_fnc(dev, ndev);
 	SET_NETDEV_DEV(ndev, dev);
 	ndev->netdev_ops = &ctucan_netdev_ops;
+	ndev->ethtool_ops = &ctucan_ethtool_ops;
 
 	/* Getting the can_clk info */
 	if (!can_clk_rate) {

drivers/net/can/dev/dev.c

@@ -322,6 +322,56 @@ int can_change_mtu(struct net_device *dev, int new_mtu)
 }
 EXPORT_SYMBOL_GPL(can_change_mtu);
 
+/* generic implementation of netdev_ops::ndo_eth_ioctl for CAN devices
+ * supporting hardware timestamps
+ */
+int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct hwtstamp_config hwts_cfg = { 0 };
+
+	switch (cmd) {
+	case SIOCSHWTSTAMP: /* set */
+		if (copy_from_user(&hwts_cfg, ifr->ifr_data, sizeof(hwts_cfg)))
+			return -EFAULT;
+		if (hwts_cfg.tx_type == HWTSTAMP_TX_ON &&
+		    hwts_cfg.rx_filter == HWTSTAMP_FILTER_ALL)
+			return 0;
+		return -ERANGE;
+
+	case SIOCGHWTSTAMP: /* get */
+		hwts_cfg.tx_type = HWTSTAMP_TX_ON;
+		hwts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+		if (copy_to_user(ifr->ifr_data, &hwts_cfg, sizeof(hwts_cfg)))
+			return -EFAULT;
+		return 0;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+EXPORT_SYMBOL(can_eth_ioctl_hwts);
+
+/* generic implementation of ethtool_ops::get_ts_info for CAN devices
+ * supporting hardware timestamps
+ */
+int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
+				    struct ethtool_ts_info *info)
+{
+	info->so_timestamping =
+		SOF_TIMESTAMPING_TX_SOFTWARE |
+		SOF_TIMESTAMPING_RX_SOFTWARE |
+		SOF_TIMESTAMPING_SOFTWARE |
+		SOF_TIMESTAMPING_TX_HARDWARE |
+		SOF_TIMESTAMPING_RX_HARDWARE |
+		SOF_TIMESTAMPING_RAW_HARDWARE;
+	info->phc_index = -1;
+	info->tx_types = BIT(HWTSTAMP_TX_ON);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+EXPORT_SYMBOL(can_ethtool_op_get_ts_info_hwts);
+
 /* Common open function when the device gets opened.
  *
  * This function should be called in the open function of the device

drivers/net/can/dev/skb.c

@@ -72,6 +72,9 @@ int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
 		/* save frame_len to reuse it when transmission is completed */
 		can_skb_prv(skb)->frame_len = frame_len;
 
+		if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
+			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
 		skb_tx_timestamp(skb);
 
 		/* save this skb for tx interrupt echo handling */
@@ -107,6 +110,9 @@ __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr,
 		struct can_skb_priv *can_skb_priv = can_skb_prv(skb);
 		struct canfd_frame *cf = (struct canfd_frame *)skb->data;
 
+		if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)
+			skb_tstamp_tx(skb, skb_hwtstamps(skb));
+
 		/* get the real payload length for netdev statistics */
 		if (cf->can_id & CAN_RTR_FLAG)
 			*len_ptr = 0;

drivers/net/can/flexcan/flexcan-core.c

@@ -2113,7 +2113,7 @@ static int flexcan_probe(struct platform_device *pdev)
 	SET_NETDEV_DEV(dev, &pdev->dev);
 
 	dev->netdev_ops = &flexcan_netdev_ops;
-	flexcan_set_ethtool_ops(dev);
+	dev->ethtool_ops = &flexcan_ethtool_ops;
 	dev->irq = irq;
 	dev->flags |= IFF_ECHO;
 

drivers/net/can/flexcan/flexcan-ethtool.c

@@ -100,15 +100,11 @@ static int flexcan_get_sset_count(struct net_device *netdev, int sset)
 	}
 }
 
-static const struct ethtool_ops flexcan_ethtool_ops = {
+const struct ethtool_ops flexcan_ethtool_ops = {
 	.get_ringparam = flexcan_get_ringparam,
 	.get_strings = flexcan_get_strings,
 	.get_priv_flags = flexcan_get_priv_flags,
 	.set_priv_flags = flexcan_set_priv_flags,
 	.get_sset_count = flexcan_get_sset_count,
+	.get_ts_info = ethtool_op_get_ts_info,
 };
-
-void flexcan_set_ethtool_ops(struct net_device *netdev)
-{
-	netdev->ethtool_ops = &flexcan_ethtool_ops;
-}

drivers/net/can/flexcan/flexcan.h

@@ -114,7 +114,7 @@ struct flexcan_priv {
 	void (*write)(u32 val, void __iomem *addr);
 };
 
-void flexcan_set_ethtool_ops(struct net_device *dev);
+extern const struct ethtool_ops flexcan_ethtool_ops;
 
 static inline bool
 flexcan_supports_rx_mailbox(const struct flexcan_priv *priv)

drivers/net/can/grcan.c

@@ -27,6 +27,7 @@
 #include <linux/interrupt.h>
 #include <linux/netdevice.h>
 #include <linux/delay.h>
+#include <linux/ethtool.h>
 #include <linux/io.h>
 #include <linux/can/dev.h>
 #include <linux/spinlock.h>
@@ -1561,6 +1562,10 @@ static const struct net_device_ops grcan_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops grcan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static int grcan_setup_netdev(struct platform_device *ofdev,
 			      void __iomem *base,
 			      int irq, u32 ambafreq, bool txbug)
@@ -1577,6 +1582,7 @@ static int grcan_setup_netdev(struct platform_device *ofdev,
 	dev->irq = irq;
 	dev->flags |= IFF_ECHO;
 	dev->netdev_ops = &grcan_netdev_ops;
+	dev->ethtool_ops = &grcan_ethtool_ops;
 	dev->sysfs_groups[0] = &sysfs_grcan_group;
 
 	priv = netdev_priv(dev);

drivers/net/can/ifi_canfd/ifi_canfd.c

@@ -13,6 +13,7 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/ethtool.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -925,6 +926,10 @@ static const struct net_device_ops ifi_canfd_netdev_ops = {
 	.ndo_change_mtu	= can_change_mtu,
 };
 
+static const struct ethtool_ops ifi_canfd_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static int ifi_canfd_plat_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -962,6 +967,7 @@ static int ifi_canfd_plat_probe(struct platform_device *pdev)
 	ndev->irq = irq;
 	ndev->flags |= IFF_ECHO;	/* we support local echo */
 	ndev->netdev_ops = &ifi_canfd_netdev_ops;
+	ndev->ethtool_ops = &ifi_canfd_ethtool_ops;
 
 	priv = netdev_priv(ndev);
 	priv->ndev = ndev;

drivers/net/can/janz-ican3.c

@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
+#include <linux/ethtool.h>
 #include <linux/platform_device.h>
 
 #include <linux/netdevice.h>
@@ -1277,6 +1278,8 @@ static void ican3_put_echo_skb(struct ican3_dev *mod, struct sk_buff *skb)
 	if (!skb)
 		return;
 
+	skb_tx_timestamp(skb);
+
 	/* save this skb for tx interrupt echo handling */
 	skb_queue_tail(&mod->echoq, skb);
 }
@@ -1752,6 +1755,10 @@ static const struct net_device_ops ican3_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops ican3_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 /*
  * Low-level CAN Device
  */
@@ -1923,6 +1930,7 @@ static int ican3_probe(struct platform_device *pdev)
 	mod->free_page = DPM_FREE_START;
 
 	ndev->netdev_ops = &ican3_netdev_ops;
+	ndev->ethtool_ops = &ican3_ethtool_ops;
 	ndev->flags |= IFF_ECHO;
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 

drivers/net/can/kvaser_pciefd.c

@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/pci.h>
 #include <linux/can/dev.h>
 #include <linux/timer.h>
@@ -919,10 +920,15 @@ static void kvaser_pciefd_bec_poll_timer(struct timer_list *data)
 static const struct net_device_ops kvaser_pciefd_netdev_ops = {
 	.ndo_open = kvaser_pciefd_open,
 	.ndo_stop = kvaser_pciefd_stop,
+	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 	.ndo_start_xmit = kvaser_pciefd_start_xmit,
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops kvaser_pciefd_ethtool_ops = {
+	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
+};
+
 static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 {
 	int i;
@@ -939,6 +945,7 @@ static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 
 		can = netdev_priv(netdev);
 		netdev->netdev_ops = &kvaser_pciefd_netdev_ops;
+		netdev->ethtool_ops = &kvaser_pciefd_ethtool_ops;
 		can->reg_base = pcie->reg_base + KVASER_PCIEFD_KCAN0_BASE +
 				i * KVASER_PCIEFD_KCAN_BASE_OFFSET;
 

drivers/net/can/m_can/m_can.c

@@ -9,6 +9,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/ethtool.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -1829,10 +1830,15 @@ static const struct net_device_ops m_can_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops m_can_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static int register_m_can_dev(struct net_device *dev)
 {
 	dev->flags |= IFF_ECHO;	/* we support local echo */
 	dev->netdev_ops = &m_can_netdev_ops;
+	dev->ethtool_ops = &m_can_ethtool_ops;
 
 	return register_candev(dev);
 }

drivers/net/can/mscan/mscan.c

@@ -616,6 +616,10 @@ static const struct net_device_ops mscan_netdev_ops = {
 	.ndo_change_mtu	= can_change_mtu,
 };
 
+static const struct ethtool_ops mscan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 int register_mscandev(struct net_device *dev, int mscan_clksrc)
 {
 	struct mscan_priv *priv = netdev_priv(dev);
@@ -676,6 +680,7 @@ struct net_device *alloc_mscandev(void)
 	priv = netdev_priv(dev);
 
 	dev->netdev_ops = &mscan_netdev_ops;
+	dev->ethtool_ops = &mscan_ethtool_ops;
 
 	dev->flags |= IFF_ECHO;	/* we support local echo */
 

drivers/net/can/pch_can.c

@@ -6,6 +6,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/delay.h>
+#include <linux/ethtool.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/sched.h>
@@ -938,6 +939,10 @@ static const struct net_device_ops pch_can_netdev_ops = {
 	.ndo_change_mtu		= can_change_mtu,
 };
 
+static const struct ethtool_ops pch_can_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static void pch_can_remove(struct pci_dev *pdev)
 {
 	struct net_device *ndev = pci_get_drvdata(pdev);
@@ -1188,6 +1193,7 @@ static int pch_can_probe(struct pci_dev *pdev,
 	pci_set_drvdata(pdev, ndev);
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 	ndev->netdev_ops = &pch_can_netdev_ops;
+	ndev->ethtool_ops = &pch_can_ethtool_ops;
 	priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
 
 	netif_napi_add_weight(ndev, &priv->napi, pch_can_poll, PCH_RX_OBJ_END);

drivers/net/can/peak_canfd/peak_canfd.c

@@ -7,6 +7,7 @@
 
 #include <linux/can.h>
 #include <linux/can/dev.h>
+#include <linux/ethtool.h>
 
 #include "peak_canfd_user.h"
 
@@ -742,13 +743,59 @@ static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
+static int peak_eth_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct hwtstamp_config hwts_cfg = { 0 };
+
+	switch (cmd) {
+	case SIOCSHWTSTAMP: /* set */
+		if (copy_from_user(&hwts_cfg, ifr->ifr_data, sizeof(hwts_cfg)))
+			return -EFAULT;
+		if (hwts_cfg.tx_type == HWTSTAMP_TX_OFF &&
+		    hwts_cfg.rx_filter == HWTSTAMP_FILTER_ALL)
+			return 0;
+		return -ERANGE;
+
+	case SIOCGHWTSTAMP: /* get */
+		hwts_cfg.tx_type = HWTSTAMP_TX_OFF;
+		hwts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+		if (copy_to_user(ifr->ifr_data, &hwts_cfg, sizeof(hwts_cfg)))
+			return -EFAULT;
+		return 0;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static const struct net_device_ops peak_canfd_netdev_ops = {
 	.ndo_open = peak_canfd_open,
 	.ndo_stop = peak_canfd_close,
+	.ndo_eth_ioctl = peak_eth_ioctl,
 	.ndo_start_xmit = peak_canfd_start_xmit,
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static int peak_get_ts_info(struct net_device *dev,
+			    struct ethtool_ts_info *info)
+{
+	info->so_timestamping =
+		SOF_TIMESTAMPING_TX_SOFTWARE |
+		SOF_TIMESTAMPING_RX_SOFTWARE |
+		SOF_TIMESTAMPING_SOFTWARE |
+		SOF_TIMESTAMPING_RX_HARDWARE |
+		SOF_TIMESTAMPING_RAW_HARDWARE;
+	info->phc_index = -1;
+	info->tx_types = BIT(HWTSTAMP_TX_OFF);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+
+static const struct ethtool_ops peak_canfd_ethtool_ops = {
+	.get_ts_info = peak_get_ts_info,
+};
+
 struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
 					int echo_skb_max)
 {
@@ -789,6 +836,7 @@ struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
 
 	ndev->flags |= IFF_ECHO;
 	ndev->netdev_ops = &peak_canfd_netdev_ops;
+	ndev->ethtool_ops = &peak_canfd_ethtool_ops;
 	ndev->dev_id = index;
 
 	return ndev;

drivers/net/can/rcar/rcar_can.c

@@ -10,6 +10,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/platform_device.h>
 #include <linux/can/dev.h>
@@ -630,6 +631,10 @@ static const struct net_device_ops rcar_can_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops rcar_can_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static void rcar_can_rx_pkt(struct rcar_can_priv *priv)
 {
 	struct net_device_stats *stats = &priv->ndev->stats;
@@ -785,6 +790,7 @@ static int rcar_can_probe(struct platform_device *pdev)
 	}
 
 	ndev->netdev_ops = &rcar_can_netdev_ops;
+	ndev->ethtool_ops = &rcar_can_ethtool_ops;
 	ndev->irq = irq;
 	ndev->flags |= IFF_ECHO;
 	priv->ndev = ndev;

drivers/net/can/rcar/rcar_canfd.c

@@ -27,6 +27,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/platform_device.h>
 #include <linux/can/dev.h>
@@ -1695,6 +1696,10 @@ static const struct net_device_ops rcar_canfd_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops rcar_canfd_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 				    u32 fcan_freq)
 {
@@ -1711,6 +1716,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 	priv = netdev_priv(ndev);
 
 	ndev->netdev_ops = &rcar_canfd_netdev_ops;
+	ndev->ethtool_ops = &rcar_canfd_ethtool_ops;
 	ndev->flags |= IFF_ECHO;
 	priv->ndev = ndev;
 	priv->base = gpriv->base;

drivers/net/can/sja1000/sja1000.c

@@ -52,6 +52,7 @@
 #include <linux/ptrace.h>
 #include <linux/string.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/if_ether.h>
@@ -654,6 +655,10 @@ static const struct net_device_ops sja1000_netdev_ops = {
 	.ndo_change_mtu	= can_change_mtu,
 };
 
+static const struct ethtool_ops sja1000_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 int register_sja1000dev(struct net_device *dev)
 {
 	int ret;
@@ -663,6 +668,7 @@ int register_sja1000dev(struct net_device *dev)
 
 	dev->flags |= IFF_ECHO;	/* we support local echo */
 	dev->netdev_ops = &sja1000_netdev_ops;
+	dev->ethtool_ops = &sja1000_ethtool_ops;
 
 	set_reset_mode(dev);
 	chipset_init(dev);

drivers/net/can/slcan/slcan-core.c

 /*
  * slcan.c - serial line CAN interface driver (using tty line discipline)
  *
- * This file is derived from linux/drivers/net/slip/slip.c
+ * This file is derived from linux/drivers/net/slip/slip.c and got
+ * inspiration from linux/drivers/net/can/can327.c for the rework made
+ * on the line discipline code.
  *
  * slip.c Authors  : Laurence Culhane <loz@holmes.demon.co.uk>
  *                   Fred N. van Kempen <waltje@uwalt.nl.mugnet.org>
  * slcan.c Author  : Oliver Hartkopp <socketcan@hartkopp.net>
+ * can327.c Author : Max Staudt <max-linux@enpas.org>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -35,8 +38,9 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
-#include <linux/moduleparam.h>
 
 #include <linux/uaccess.h>
 #include <linux/bitops.h>
@@ -46,10 +50,6 @@
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/rtnetlink.h>
-#include <linux/if_arp.h>
-#include <linux/if_ether.h>
-#include <linux/sched.h>
-#include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/workqueue.h>
@@ -63,30 +63,22 @@ MODULE_ALIAS_LDISC(N_SLCAN);
 MODULE_DESCRIPTION("serial line CAN interface");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
-
-#define SLCAN_MAGIC 0x53CA
-
-static int maxdev = 10;		/* MAX number of SLCAN channels;
-				 * This can be overridden with
-				 * insmod slcan.ko maxdev=nnn
-				 */
-module_param(maxdev, int, 0);
-MODULE_PARM_DESC(maxdev, "Maximum number of slcan interfaces");
+MODULE_AUTHOR("Dario Binacchi <dario.binacchi@amarulasolutions.com>");
 
 /* maximum rx buffer len: extended CAN frame with timestamp */
-#define SLC_MTU (sizeof("T1111222281122334455667788EA5F\r") + 1)
-
-#define SLC_CMD_LEN 1
-#define SLC_SFF_ID_LEN 3
-#define SLC_EFF_ID_LEN 8
-#define SLC_STATE_LEN 1
-#define SLC_STATE_BE_RXCNT_LEN 3
-#define SLC_STATE_BE_TXCNT_LEN 3
-#define SLC_STATE_FRAME_LEN       (1 + SLC_CMD_LEN + SLC_STATE_BE_RXCNT_LEN + \
-				   SLC_STATE_BE_TXCNT_LEN)
+#define SLCAN_MTU (sizeof("T1111222281122334455667788EA5F\r") + 1)
+
+#define SLCAN_CMD_LEN 1
+#define SLCAN_SFF_ID_LEN 3
+#define SLCAN_EFF_ID_LEN 8
+#define SLCAN_STATE_LEN 1
+#define SLCAN_STATE_BE_RXCNT_LEN 3
+#define SLCAN_STATE_BE_TXCNT_LEN 3
+#define SLCAN_STATE_FRAME_LEN       (1 + SLCAN_CMD_LEN + \
+				     SLCAN_STATE_BE_RXCNT_LEN + \
+				     SLCAN_STATE_BE_TXCNT_LEN)
 struct slcan {
 	struct can_priv         can;
-	int			magic;
 
 	/* Various fields. */
 	struct tty_struct	*tty;		/* ptr to TTY structure	     */
@@ -95,24 +87,21 @@ struct slcan {
 	struct work_struct	tx_work;	/* Flushes transmit buffer   */
 
 	/* These are pointers to the malloc()ed frame buffers. */
-	unsigned char		rbuff[SLC_MTU];	/* receiver buffer	     */
+	unsigned char		rbuff[SLCAN_MTU];	/* receiver buffer   */
 	int			rcount;         /* received chars counter    */
-	unsigned char		xbuff[SLC_MTU];	/* transmitter buffer	     */
+	unsigned char		xbuff[SLCAN_MTU];	/* transmitter buffer*/
 	unsigned char		*xhead;         /* pointer to next XMIT byte */
 	int			xleft;          /* bytes left in XMIT queue  */
 
 	unsigned long		flags;		/* Flag values/ mode etc     */
-#define SLF_INUSE		0		/* Channel in use            */
-#define SLF_ERROR		1               /* Parity, etc. error        */
-#define SLF_XCMD		2               /* Command transmission      */
+#define SLF_ERROR		0               /* Parity, etc. error        */
+#define SLF_XCMD		1               /* Command transmission      */
 	unsigned long           cmd_flags;      /* Command flags             */
 #define CF_ERR_RST		0               /* Reset errors on open      */
 	wait_queue_head_t       xcmd_wait;      /* Wait queue for commands   */
 						/* transmission              */
 };
 
-static struct net_device **slcan_devs;
-
 static const u32 slcan_bitrate_const[] = {
 	10000, 20000, 50000, 100000, 125000,
 	250000, 500000, 800000, 1000000
@@ -179,7 +168,7 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on)
  *************************************************************************/
 
 /* Send one completely decapsulated can_frame to the network layer */
-static void slc_bump_frame(struct slcan *sl)
+static void slcan_bump_frame(struct slcan *sl)
 {
 	struct sk_buff *skb;
 	struct can_frame *cf;
@@ -199,10 +188,10 @@ static void slc_bump_frame(struct slcan *sl)
 		fallthrough;
 	case 't':
 		/* store dlc ASCII value and terminate SFF CAN ID string */
-		cf->len = sl->rbuff[SLC_CMD_LEN + SLC_SFF_ID_LEN];
-		sl->rbuff[SLC_CMD_LEN + SLC_SFF_ID_LEN] = 0;
+		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN];
+		sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN] = 0;
 		/* point to payload data behind the dlc */
-		cmd += SLC_CMD_LEN + SLC_SFF_ID_LEN + 1;
+		cmd += SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN + 1;
 		break;
 	case 'R':
 		cf->can_id = CAN_RTR_FLAG;
@@ -210,16 +199,16 @@ static void slc_bump_frame(struct slcan *sl)
 	case 'T':
 		cf->can_id |= CAN_EFF_FLAG;
 		/* store dlc ASCII value and terminate EFF CAN ID string */
-		cf->len = sl->rbuff[SLC_CMD_LEN + SLC_EFF_ID_LEN];
-		sl->rbuff[SLC_CMD_LEN + SLC_EFF_ID_LEN] = 0;
+		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN];
+		sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN] = 0;
 		/* point to payload data behind the dlc */
-		cmd += SLC_CMD_LEN + SLC_EFF_ID_LEN + 1;
+		cmd += SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN + 1;
 		break;
 	default:
 		goto decode_failed;
 	}
 
-	if (kstrtou32(sl->rbuff + SLC_CMD_LEN, 16, &tmpid))
+	if (kstrtou32(sl->rbuff + SLCAN_CMD_LEN, 16, &tmpid))
 		goto decode_failed;
 
 	cf->can_id |= tmpid;
@@ -266,7 +255,7 @@ static void slc_bump_frame(struct slcan *sl)
  * sb256256 : state bus-off: rx counter 256, tx counter 256
  * sa057033 : state active, rx counter 57, tx counter 33
  */
-static void slc_bump_state(struct slcan *sl)
+static void slcan_bump_state(struct slcan *sl)
 {
 	struct net_device *dev = sl->dev;
 	struct sk_buff *skb;
@@ -292,16 +281,16 @@ static void slc_bump_state(struct slcan *sl)
 		return;
 	}
 
-	if (state == sl->can.state || sl->rcount < SLC_STATE_FRAME_LEN)
+	if (state == sl->can.state || sl->rcount < SLCAN_STATE_FRAME_LEN)
 		return;
 
-	cmd += SLC_STATE_BE_RXCNT_LEN + SLC_CMD_LEN + 1;
-	cmd[SLC_STATE_BE_TXCNT_LEN] = 0;
+	cmd += SLCAN_STATE_BE_RXCNT_LEN + SLCAN_CMD_LEN + 1;
+	cmd[SLCAN_STATE_BE_TXCNT_LEN] = 0;
 	if (kstrtou32(cmd, 10, &txerr))
 		return;
 
 	*cmd = 0;
-	cmd -= SLC_STATE_BE_RXCNT_LEN;
+	cmd -= SLCAN_STATE_BE_RXCNT_LEN;
 	if (kstrtou32(cmd, 10, &rxerr))
 		return;
 
@@ -330,7 +319,7 @@ static void slc_bump_state(struct slcan *sl)
  * e1a : len 1, errors: ACK error
  * e3bcO: len 3, errors: Bit0 error, CRC error, Tx overrun error
  */
-static void slc_bump_err(struct slcan *sl)
+static void slcan_bump_err(struct slcan *sl)
 {
 	struct net_device *dev = sl->dev;
 	struct sk_buff *skb;
@@ -346,7 +335,7 @@ static void slc_bump_err(struct slcan *sl)
 	else
 		return;
 
-	if ((len + SLC_CMD_LEN + 1) > sl->rcount)
+	if ((len + SLCAN_CMD_LEN + 1) > sl->rcount)
 		return;
 
 	skb = alloc_can_err_skb(dev, &cf);
@@ -354,7 +343,7 @@ static void slc_bump_err(struct slcan *sl)
 	if (skb)
 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 
-	cmd += SLC_CMD_LEN + 1;
+	cmd += SLCAN_CMD_LEN + 1;
 	for (i = 0; i < len; i++, cmd++) {
 		switch (*cmd) {
 		case 'a':
@@ -443,7 +432,7 @@ static void slc_bump_err(struct slcan *sl)
 		netif_rx(skb);
 }
 
-static void slc_bump(struct slcan *sl)
+static void slcan_bump(struct slcan *sl)
 {
 	switch (sl->rbuff[0]) {
 	case 'r':
@@ -453,11 +442,11 @@ static void slc_bump(struct slcan *sl)
 	case 'R':
 		fallthrough;
 	case 'T':
-		return slc_bump_frame(sl);
+		return slcan_bump_frame(sl);
 	case 'e':
-		return slc_bump_err(sl);
+		return slcan_bump_err(sl);
 	case 's':
-		return slc_bump_state(sl);
+		return slcan_bump_state(sl);
 	default:
 		return;
 	}
@@ -469,12 +458,12 @@ static void slcan_unesc(struct slcan *sl, unsigned char s)
 	if ((s == '\r') || (s == '\a')) { /* CR or BEL ends the pdu */
 		if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
 		    sl->rcount > 4)
-			slc_bump(sl);
+			slcan_bump(sl);
 
 		sl->rcount = 0;
 	} else {
 		if (!test_bit(SLF_ERROR, &sl->flags))  {
-			if (sl->rcount < SLC_MTU)  {
+			if (sl->rcount < SLCAN_MTU)  {
 				sl->rbuff[sl->rcount++] = s;
 				return;
 			}
@@ -490,7 +479,7 @@ static void slcan_unesc(struct slcan *sl, unsigned char s)
  *************************************************************************/
 
 /* Encapsulate one can_frame and stuff into a TTY queue. */
-static void slc_encaps(struct slcan *sl, struct can_frame *cf)
+static void slcan_encaps(struct slcan *sl, struct can_frame *cf)
 {
 	int actual, i;
 	unsigned char *pos;
@@ -507,11 +496,11 @@ static void slc_encaps(struct slcan *sl, struct can_frame *cf)
 	/* determine number of chars for the CAN-identifier */
 	if (cf->can_id & CAN_EFF_FLAG) {
 		id &= CAN_EFF_MASK;
-		endpos = pos + SLC_EFF_ID_LEN;
+		endpos = pos + SLCAN_EFF_ID_LEN;
 	} else {
 		*pos |= 0x20; /* convert R/T to lower case for SFF */
 		id &= CAN_SFF_MASK;
-		endpos = pos + SLC_SFF_ID_LEN;
+		endpos = pos + SLCAN_SFF_ID_LEN;
 	}
 
 	/* build 3 (SFF) or 8 (EFF) digit CAN identifier */
@@ -521,7 +510,8 @@ static void slc_encaps(struct slcan *sl, struct can_frame *cf)
 		id >>= 4;
 	}
 
-	pos += (cf->can_id & CAN_EFF_FLAG) ? SLC_EFF_ID_LEN : SLC_SFF_ID_LEN;
+	pos += (cf->can_id & CAN_EFF_FLAG) ?
+		SLCAN_EFF_ID_LEN : SLCAN_SFF_ID_LEN;
 
 	*pos++ = cf->len + '0';
 
@@ -557,9 +547,8 @@ static void slcan_transmit(struct work_struct *work)
 
 	spin_lock_bh(&sl->lock);
 	/* First make sure we're connected. */
-	if (!sl->tty || sl->magic != SLCAN_MAGIC ||
-	    (unlikely(!netif_running(sl->dev)) &&
-	     likely(!test_bit(SLF_XCMD, &sl->flags)))) {
+	if (unlikely(!netif_running(sl->dev)) &&
+	    likely(!test_bit(SLF_XCMD, &sl->flags))) {
 		spin_unlock_bh(&sl->lock);
 		return;
 	}
@@ -594,17 +583,14 @@ static void slcan_transmit(struct work_struct *work)
  */
 static void slcan_write_wakeup(struct tty_struct *tty)
 {
-	struct slcan *sl;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 
-	rcu_read_lock();
-	sl = rcu_dereference(tty->disc_data);
-	if (sl)
-		schedule_work(&sl->tx_work);
-	rcu_read_unlock();
+	schedule_work(&sl->tx_work);
 }
 
 /* Send a can_frame to a TTY queue. */
-static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t slcan_netdev_xmit(struct sk_buff *skb,
+				     struct net_device *dev)
 {
 	struct slcan *sl = netdev_priv(dev);
 
@@ -623,9 +609,11 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	netif_stop_queue(sl->dev);
-	slc_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */
+	slcan_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */
 	spin_unlock(&sl->lock);
 
+	skb_tx_timestamp(skb);
+
 out:
 	kfree_skb(skb);
 	return NETDEV_TX_OK;
@@ -666,30 +654,26 @@ static int slcan_transmit_cmd(struct slcan *sl, const unsigned char *cmd)
 }
 
 /* Netdevice UP -> DOWN routine */
-static int slc_close(struct net_device *dev)
+static int slcan_netdev_close(struct net_device *dev)
 {
 	struct slcan *sl = netdev_priv(dev);
 	int err;
 
-	spin_lock_bh(&sl->lock);
-	if (sl->tty) {
-		if (sl->can.bittiming.bitrate &&
-		    sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {
-			spin_unlock_bh(&sl->lock);
-			err = slcan_transmit_cmd(sl, "C\r");
-			spin_lock_bh(&sl->lock);
-			if (err)
-				netdev_warn(dev,
-					    "failed to send close command 'C\\r'\n");
-		}
-
-		/* TTY discipline is running. */
-		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
+	if (sl->can.bittiming.bitrate &&
+	    sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {
+		err = slcan_transmit_cmd(sl, "C\r");
+		if (err)
+			netdev_warn(dev,
+				    "failed to send close command 'C\\r'\n");
 	}
+
+	/* TTY discipline is running. */
+	clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
+	flush_work(&sl->tx_work);
+
 	netif_stop_queue(dev);
 	sl->rcount   = 0;
 	sl->xleft    = 0;
-	spin_unlock_bh(&sl->lock);
 	close_candev(dev);
 	sl->can.state = CAN_STATE_STOPPED;
 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN)
@@ -699,15 +683,12 @@ static int slc_close(struct net_device *dev)
 }
 
 /* Netdevice DOWN -> UP routine */
-static int slc_open(struct net_device *dev)
+static int slcan_netdev_open(struct net_device *dev)
 {
 	struct slcan *sl = netdev_priv(dev);
-	unsigned char cmd[SLC_MTU];
+	unsigned char cmd[SLCAN_MTU];
 	int err, s;
 
-	if (!sl->tty)
-		return -ENODEV;
-
 	/* The baud rate is not set with the command
 	 * `ip link set <iface> type can bitrate <baud>' and therefore
 	 * can.bittiming.bitrate is CAN_BITRATE_UNSET (0), causing
@@ -722,8 +703,6 @@ static int slc_open(struct net_device *dev)
 		return err;
 	}
 
-	sl->flags &= BIT(SLF_INUSE);
-
 	if (sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {
 		for (s = 0; s < ARRAY_SIZE(slcan_bitrate_const); s++) {
 			if (sl->can.bittiming.bitrate == slcan_bitrate_const[s])
@@ -751,10 +730,20 @@ static int slc_open(struct net_device *dev)
 			}
 		}
 
-		err = slcan_transmit_cmd(sl, "O\r");
-		if (err) {
-			netdev_err(dev, "failed to send open command 'O\\r'\n");
-			goto cmd_transmit_failed;
+		if (sl->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
+			err = slcan_transmit_cmd(sl, "L\r");
+			if (err) {
+				netdev_err(dev,
+					   "failed to send listen-only command 'L\\r'\n");
+				goto cmd_transmit_failed;
+			}
+		} else {
+			err = slcan_transmit_cmd(sl, "O\r");
+			if (err) {
+				netdev_err(dev,
+					   "failed to send open command 'O\\r'\n");
+				goto cmd_transmit_failed;
+			}
 		}
 	}
 
@@ -767,24 +756,11 @@ static int slc_open(struct net_device *dev)
 	return err;
 }
 
-static void slc_dealloc(struct slcan *sl)
-{
-	int i = sl->dev->base_addr;
-
-	free_candev(sl->dev);
-	slcan_devs[i] = NULL;
-}
-
-static int slcan_change_mtu(struct net_device *dev, int new_mtu)
-{
-	return -EINVAL;
-}
-
-static const struct net_device_ops slc_netdev_ops = {
-	.ndo_open               = slc_open,
-	.ndo_stop               = slc_close,
-	.ndo_start_xmit         = slc_xmit,
-	.ndo_change_mtu         = slcan_change_mtu,
+static const struct net_device_ops slcan_netdev_ops = {
+	.ndo_open               = slcan_netdev_open,
+	.ndo_stop               = slcan_netdev_close,
+	.ndo_start_xmit         = slcan_netdev_xmit,
+	.ndo_change_mtu         = can_change_mtu,
 };
 
 /******************************************
@@ -804,7 +780,7 @@ static void slcan_receive_buf(struct tty_struct *tty,
 {
 	struct slcan *sl = (struct slcan *)tty->disc_data;
 
-	if (!sl || sl->magic != SLCAN_MAGIC || !netif_running(sl->dev))
+	if (!netif_running(sl->dev))
 		return;
 
 	/* Read the characters out of the buffer */
@@ -819,80 +795,15 @@ static void slcan_receive_buf(struct tty_struct *tty,
 	}
 }
 
-/************************************
- *  slcan_open helper routines.
- ************************************/
-
-/* Collect hanged up channels */
-static void slc_sync(void)
-{
-	int i;
-	struct net_device *dev;
-	struct slcan	  *sl;
-
-	for (i = 0; i < maxdev; i++) {
-		dev = slcan_devs[i];
-		if (!dev)
-			break;
-
-		sl = netdev_priv(dev);
-		if (sl->tty)
-			continue;
-		if (dev->flags & IFF_UP)
-			dev_close(dev);
-	}
-}
-
-/* Find a free SLCAN channel, and link in this `tty' line. */
-static struct slcan *slc_alloc(void)
-{
-	int i;
-	struct net_device *dev = NULL;
-	struct slcan       *sl;
-
-	for (i = 0; i < maxdev; i++) {
-		dev = slcan_devs[i];
-		if (!dev)
-			break;
-	}
-
-	/* Sorry, too many, all slots in use */
-	if (i >= maxdev)
-		return NULL;
-
-	dev = alloc_candev(sizeof(*sl), 1);
-	if (!dev)
-		return NULL;
-
-	snprintf(dev->name, sizeof(dev->name), "slcan%d", i);
-	dev->netdev_ops = &slc_netdev_ops;
-	dev->base_addr  = i;
-	slcan_set_ethtool_ops(dev);
-	sl = netdev_priv(dev);
-
-	/* Initialize channel control data */
-	sl->magic = SLCAN_MAGIC;
-	sl->dev	= dev;
-	sl->can.bitrate_const = slcan_bitrate_const;
-	sl->can.bitrate_const_cnt = ARRAY_SIZE(slcan_bitrate_const);
-	spin_lock_init(&sl->lock);
-	INIT_WORK(&sl->tx_work, slcan_transmit);
-	init_waitqueue_head(&sl->xcmd_wait);
-	slcan_devs[i] = dev;
-
-	return sl;
-}
-
 /* Open the high-level part of the SLCAN channel.
  * This function is called by the TTY module when the
- * SLCAN line discipline is called for.  Because we are
- * sure the tty line exists, we only have to link it to
- * a free SLCAN channel...
+ * SLCAN line discipline is called for.
  *
  * Called in process context serialized from other ldisc calls.
  */
 static int slcan_open(struct tty_struct *tty)
 {
+	struct net_device *dev;
 	struct slcan *sl;
 	int err;
 
@@ -902,72 +813,50 @@ static int slcan_open(struct tty_struct *tty)
 	if (!tty->ops->write)
 		return -EOPNOTSUPP;
 
-	/* RTnetlink lock is misused here to serialize concurrent
-	 * opens of slcan channels. There are better ways, but it is
-	 * the simplest one.
-	 */
-	rtnl_lock();
+	dev = alloc_candev(sizeof(*sl), 1);
+	if (!dev)
+		return -ENFILE;
 
-	/* Collect hanged up channels. */
-	slc_sync();
+	sl = netdev_priv(dev);
 
-	sl = tty->disc_data;
+	/* Configure TTY interface */
+	tty->receive_room = 65536; /* We don't flow control */
+	sl->rcount = 0;
+	sl->xleft = 0;
+	spin_lock_init(&sl->lock);
+	INIT_WORK(&sl->tx_work, slcan_transmit);
+	init_waitqueue_head(&sl->xcmd_wait);
 
-	err = -EEXIST;
-	/* First make sure we're not already connected. */
-	if (sl && sl->magic == SLCAN_MAGIC)
-		goto err_exit;
+	/* Configure CAN metadata */
+	sl->can.bitrate_const = slcan_bitrate_const;
+	sl->can.bitrate_const_cnt = ARRAY_SIZE(slcan_bitrate_const);
+	sl->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
 
-	/* OK.  Find a free SLCAN channel to use. */
-	err = -ENFILE;
-	sl = slc_alloc();
-	if (!sl)
-		goto err_exit;
+	/* Configure netdev interface */
+	sl->dev	= dev;
+	dev->netdev_ops = &slcan_netdev_ops;
+	dev->ethtool_ops = &slcan_ethtool_ops;
 
+	/* Mark ldisc channel as alive */
 	sl->tty = tty;
 	tty->disc_data = sl;
 
-	if (!test_bit(SLF_INUSE, &sl->flags)) {
-		/* Perform the low-level SLCAN initialization. */
-		sl->rcount   = 0;
-		sl->xleft    = 0;
-
-		set_bit(SLF_INUSE, &sl->flags);
-
-		rtnl_unlock();
-		err = register_candev(sl->dev);
-		if (err) {
-			pr_err("slcan: can't register candev\n");
-			goto err_free_chan;
-		}
-	} else {
-		rtnl_unlock();
+	err = register_candev(dev);
+	if (err) {
+		free_candev(dev);
+		pr_err("can't register candev\n");
+		return err;
 	}
 
-	tty->receive_room = 65536;	/* We don't flow control */
-
+	netdev_info(dev, "slcan on %s.\n", tty->name);
 	/* TTY layer expects 0 on success */
 	return 0;
-
-err_free_chan:
-	rtnl_lock();
-	sl->tty = NULL;
-	tty->disc_data = NULL;
-	clear_bit(SLF_INUSE, &sl->flags);
-	slc_dealloc(sl);
-	rtnl_unlock();
-	return err;
-
-err_exit:
-	rtnl_unlock();
-
-	/* Count references from TTY module */
-	return err;
 }
 
 /* Close down a SLCAN channel.
  * This means flushing out any pending queues, and then returning. This
  * call is serialized against other ldisc functions.
+ * Once this is called, no other ldisc function of ours is entered.
  *
  * We also use this method for a hangup event.
  */
@@ -975,28 +864,20 @@ static void slcan_close(struct tty_struct *tty)
 {
 	struct slcan *sl = (struct slcan *)tty->disc_data;
 
-	/* First make sure we're connected. */
-	if (!sl || sl->magic != SLCAN_MAGIC || sl->tty != tty)
-		return;
+	/* unregister_netdev() calls .ndo_stop() so we don't have to.
+	 * Our .ndo_stop() also flushes the TTY write wakeup handler,
+	 * so we can safely set sl->tty = NULL after this.
+	 */
+	unregister_candev(sl->dev);
 
+	/* Mark channel as dead */
 	spin_lock_bh(&sl->lock);
-	rcu_assign_pointer(tty->disc_data, NULL);
+	tty->disc_data = NULL;
 	sl->tty = NULL;
 	spin_unlock_bh(&sl->lock);
 
-	synchronize_rcu();
-	flush_work(&sl->tx_work);
-
-	slc_close(sl->dev);
-	unregister_candev(sl->dev);
-	rtnl_lock();
-	slc_dealloc(sl);
-	rtnl_unlock();
-}
-
-static void slcan_hangup(struct tty_struct *tty)
-{
-	slcan_close(tty);
+	netdev_info(sl->dev, "slcan off %s.\n", tty->name);
+	free_candev(sl->dev);
 }
 
 /* Perform I/O control on an active SLCAN channel. */
@@ -1006,10 +887,6 @@ static int slcan_ioctl(struct tty_struct *tty, unsigned int cmd,
 	struct slcan *sl = (struct slcan *)tty->disc_data;
 	unsigned int tmp;
 
-	/* First make sure we're connected. */
-	if (!sl || sl->magic != SLCAN_MAGIC)
-		return -EINVAL;
-
 	switch (cmd) {
 	case SIOCGIFNAME:
 		tmp = strlen(sl->dev->name) + 1;
@@ -1025,13 +902,12 @@ static int slcan_ioctl(struct tty_struct *tty, unsigned int cmd,
 	}
 }
 
-static struct tty_ldisc_ops slc_ldisc = {
+static struct tty_ldisc_ops slcan_ldisc = {
 	.owner		= THIS_MODULE,
 	.num		= N_SLCAN,
-	.name		= "slcan",
+	.name		= KBUILD_MODNAME,
 	.open		= slcan_open,
 	.close		= slcan_close,
-	.hangup		= slcan_hangup,
 	.ioctl		= slcan_ioctl,
 	.receive_buf	= slcan_receive_buf,
 	.write_wakeup	= slcan_write_wakeup,
@@ -1041,79 +917,22 @@ static int __init slcan_init(void)
 {
 	int status;
 
-	if (maxdev < 4)
-		maxdev = 4; /* Sanity */
-
-	pr_info("slcan: serial line CAN interface driver\n");
-	pr_info("slcan: %d dynamic interface channels.\n", maxdev);
-
-	slcan_devs = kcalloc(maxdev, sizeof(struct net_device *), GFP_KERNEL);
-	if (!slcan_devs)
-		return -ENOMEM;
+	pr_info("serial line CAN interface driver\n");
 
 	/* Fill in our line protocol discipline, and register it */
-	status = tty_register_ldisc(&slc_ldisc);
-	if (status)  {
-		pr_err("slcan: can't register line discipline\n");
-		kfree(slcan_devs);
-	}
+	status = tty_register_ldisc(&slcan_ldisc);
+	if (status)
+		pr_err("can't register line discipline\n");
+
 	return status;
 }
 
 static void __exit slcan_exit(void)
 {
-	int i;
-	struct net_device *dev;
-	struct slcan *sl;
-	unsigned long timeout = jiffies + HZ;
-	int busy = 0;
-
-	if (!slcan_devs)
-		return;
-
-	/* First of all: check for active disciplines and hangup them.
-	 */
-	do {
-		if (busy)
-			msleep_interruptible(100);
-
-		busy = 0;
-		for (i = 0; i < maxdev; i++) {
-			dev = slcan_devs[i];
-			if (!dev)
-				continue;
-			sl = netdev_priv(dev);
-			spin_lock_bh(&sl->lock);
-			if (sl->tty) {
-				busy++;
-				tty_hangup(sl->tty);
-			}
-			spin_unlock_bh(&sl->lock);
-		}
-	} while (busy && time_before(jiffies, timeout));
-
-	/* FIXME: hangup is async so we should wait when doing this second
-	 * phase
+	/* This will only be called when all channels have been closed by
+	 * userspace - tty_ldisc.c takes care of the module's refcount.
 	 */
-
-	for (i = 0; i < maxdev; i++) {
-		dev = slcan_devs[i];
-		if (!dev)
-			continue;
-
-		sl = netdev_priv(dev);
-		if (sl->tty)
-			netdev_err(dev, "tty discipline still running\n");
-
-		slc_close(dev);
-		unregister_candev(dev);
-		slc_dealloc(sl);
-	}
-
-	kfree(slcan_devs);
-	slcan_devs = NULL;
-
-	tty_unregister_ldisc(&slc_ldisc);
+	tty_unregister_ldisc(&slcan_ldisc);
 }
 
 module_init(slcan_init);

drivers/net/can/slcan/slcan-ethtool.c

@@ -52,14 +52,10 @@ static int slcan_get_sset_count(struct net_device *netdev, int sset)
 	}
 }
 
-static const struct ethtool_ops slcan_ethtool_ops = {
+const struct ethtool_ops slcan_ethtool_ops = {
 	.get_strings = slcan_get_strings,
 	.get_priv_flags = slcan_get_priv_flags,
 	.set_priv_flags = slcan_set_priv_flags,
 	.get_sset_count = slcan_get_sset_count,
+	.get_ts_info = ethtool_op_get_ts_info,
 };
-
-void slcan_set_ethtool_ops(struct net_device *netdev)
-{
-	netdev->ethtool_ops = &slcan_ethtool_ops;
-}

drivers/net/can/slcan/slcan.h

@@ -13,6 +13,7 @@
 
 bool slcan_err_rst_on_open(struct net_device *ndev);
 int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on);
-void slcan_set_ethtool_ops(struct net_device *ndev);
+
+extern const struct ethtool_ops slcan_ethtool_ops;
 
 #endif /* _SLCAN_H */

drivers/net/can/softing/softing_main.c

@@ -5,6 +5,7 @@
  * - Kurt Van Dijck, EIA Electronics
  */
 
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <asm/io.h>
@@ -611,8 +612,12 @@ static const struct net_device_ops softing_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops softing_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct can_bittiming_const softing_btr_const = {
-	.name = "softing",
+	.name = KBUILD_MODNAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
 	.tseg2_min = 1,
@@ -649,6 +654,7 @@ static struct net_device *softing_netdev_create(struct softing *card,
 
 	netdev->flags |= IFF_ECHO;
 	netdev->netdev_ops = &softing_netdev_ops;
+	netdev->ethtool_ops = &softing_ethtool_ops;
 	priv->can.do_set_mode = softing_candev_set_mode;
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
@@ -846,7 +852,7 @@ static int softing_pdev_probe(struct platform_device *pdev)
 
 static struct platform_driver softing_driver = {
 	.driver = {
-		.name = "softing",
+		.name = KBUILD_MODNAME,
 	},
 	.probe = softing_pdev_probe,
 	.remove = softing_pdev_remove,

drivers/net/can/spi/hi311x.c

@@ -20,6 +20,7 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/freezer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -802,6 +803,10 @@ static const struct net_device_ops hi3110_netdev_ops = {
 	.ndo_start_xmit = hi3110_hard_start_xmit,
 };
 
+static const struct ethtool_ops hi3110_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct of_device_id hi3110_of_match[] = {
 	{
 		.compatible	= "holt,hi3110",
@@ -856,6 +861,7 @@ static int hi3110_can_probe(struct spi_device *spi)
 		goto out_free;
 
 	net->netdev_ops = &hi3110_netdev_ops;
+	net->ethtool_ops = &hi3110_ethtool_ops;
 	net->flags |= IFF_ECHO;
 
 	priv = netdev_priv(net);

drivers/net/can/spi/mcp251x.c

@@ -26,6 +26,7 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/freezer.h>
 #include <linux/gpio.h>
 #include <linux/gpio/driver.h>
@@ -1248,6 +1249,10 @@ static const struct net_device_ops mcp251x_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops mcp251x_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct of_device_id mcp251x_of_match[] = {
 	{
 		.compatible	= "microchip,mcp2510",
@@ -1313,6 +1318,7 @@ static int mcp251x_can_probe(struct spi_device *spi)
 		goto out_free;
 
 	net->netdev_ops = &mcp251x_netdev_ops;
+	net->ethtool_ops = &mcp251x_ethtool_ops;
 	net->flags |= IFF_ECHO;
 
 	priv = netdev_priv(net);

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

@@ -1671,6 +1671,7 @@ static const struct net_device_ops mcp251xfd_netdev_ops = {
 	.ndo_open = mcp251xfd_open,
 	.ndo_stop = mcp251xfd_stop,
 	.ndo_start_xmit	= mcp251xfd_start_xmit,
+	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 	.ndo_change_mtu = can_change_mtu,
 };
 

drivers/net/can/spi/mcp251xfd/mcp251xfd-dump.c

@@ -253,7 +253,7 @@ void mcp251xfd_dump(const struct mcp251xfd_priv *priv)
 		file_size += mcp251xfd_dump_reg_space[i].size / sizeof(u32) *
 			sizeof(struct mcp251xfd_dump_object_reg);
 
-	/* TEF ring, RX ring, TX rings */
+	/* TEF ring, RX rings, TX ring */
 	rings_num = 1 + priv->rx_ring_num + 1;
 	obj_num += rings_num;
 	file_size += rings_num * __MCP251XFD_DUMP_OBJECT_RING_KEY_MAX  *

drivers/net/can/spi/mcp251xfd/mcp251xfd-ethtool.c

@@ -124,6 +124,7 @@ static const struct ethtool_ops mcp251xfd_ethtool_ops = {
 	.set_ringparam = mcp251xfd_ring_set_ringparam,
 	.get_coalesce = mcp251xfd_ring_get_coalesce,
 	.set_coalesce = mcp251xfd_ring_set_coalesce,
+	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
 };
 
 void mcp251xfd_ethtool_init(struct mcp251xfd_priv *priv)

drivers/net/can/sun4i_can.c

@@ -53,6 +53,7 @@
 #include <linux/can/error.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/ethtool.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -761,6 +762,10 @@ static const struct net_device_ops sun4ican_netdev_ops = {
 	.ndo_start_xmit = sun4ican_start_xmit,
 };
 
+static const struct ethtool_ops sun4ican_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct sun4ican_quirks sun4ican_quirks_a10 = {
 	.has_reset = false,
 };
@@ -851,6 +856,7 @@ static int sun4ican_probe(struct platform_device *pdev)
 	}
 
 	dev->netdev_ops = &sun4ican_netdev_ops;
+	dev->ethtool_ops = &sun4ican_ethtool_ops;
 	dev->irq = irq;
 	dev->flags |= IFF_ECHO;
 

drivers/net/can/ti_hecc.c

@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/platform_device.h>
@@ -841,6 +842,10 @@ static const struct net_device_ops ti_hecc_netdev_ops = {
 	.ndo_change_mtu		= can_change_mtu,
 };
 
+static const struct ethtool_ops ti_hecc_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct of_device_id ti_hecc_dt_ids[] = {
 	{
 		.compatible = "ti,am3517-hecc",
@@ -918,6 +923,7 @@ static int ti_hecc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ndev);
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 	ndev->netdev_ops = &ti_hecc_netdev_ops;
+	ndev->ethtool_ops = &ti_hecc_ethtool_ops;
 
 	priv->clk = clk_get(&pdev->dev, "hecc_ck");
 	if (IS_ERR(priv->clk)) {

drivers/net/can/usb/ems_usb.c

@@ -4,6 +4,7 @@
  *
  * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
  */
+#include <linux/ethtool.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -879,8 +880,12 @@ static const struct net_device_ops ems_usb_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops ems_usb_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct can_bittiming_const ems_usb_bittiming_const = {
-	.name = "ems_usb",
+	.name = KBUILD_MODNAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
 	.tseg2_min = 1,
@@ -990,6 +995,7 @@ static int ems_usb_probe(struct usb_interface *intf,
 	dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
 	netdev->netdev_ops = &ems_usb_netdev_ops;
+	netdev->ethtool_ops = &ems_usb_ethtool_ops;
 
 	netdev->flags |= IFF_ECHO; /* we support local echo */
 
@@ -1074,7 +1080,7 @@ static void ems_usb_disconnect(struct usb_interface *intf)
 
 /* usb specific object needed to register this driver with the usb subsystem */
 static struct usb_driver ems_usb_driver = {
-	.name = "ems_usb",
+	.name = KBUILD_MODNAME,
 	.probe = ems_usb_probe,
 	.disconnect = ems_usb_disconnect,
 	.id_table = ems_usb_table,

drivers/net/can/usb/esd_usb.c

@@ -5,6 +5,7 @@
  * Copyright (C) 2010-2012 esd electronic system design gmbh, Matthias Fuchs <socketcan@esd.eu>
  * Copyright (C) 2022 esd electronics gmbh, Frank Jungclaus <frank.jungclaus@esd.eu>
  */
+#include <linux/ethtool.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -882,6 +883,10 @@ static const struct net_device_ops esd_usb_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops esd_usb_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct can_bittiming_const esd_usb2_bittiming_const = {
 	.name = "esd_usb2",
 	.tseg1_min = ESD_USB2_TSEG1_MIN,
@@ -1015,6 +1020,7 @@ static int esd_usb_probe_one_net(struct usb_interface *intf, int index)
 	netdev->flags |= IFF_ECHO; /* we support local echo */
 
 	netdev->netdev_ops = &esd_usb_netdev_ops;
+	netdev->ethtool_ops = &esd_usb_ethtool_ops;
 
 	SET_NETDEV_DEV(netdev, &intf->dev);
 	netdev->dev_id = index;
@@ -1138,7 +1144,7 @@ static void esd_usb_disconnect(struct usb_interface *intf)
 
 /* usb specific object needed to register this driver with the usb subsystem */
 static struct usb_driver esd_usb_driver = {
-	.name = "esd_usb",
+	.name = KBUILD_MODNAME,
 	.probe = esd_usb_probe,
 	.disconnect = esd_usb_disconnect,
 	.id_table = esd_usb_table,

drivers/net/can/usb/etas_es58x/es58x_core.c

@@ -10,6 +10,7 @@
  * Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
  */
 
+#include <linux/ethtool.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/usb.h>
@@ -18,14 +19,11 @@
 
 #include "es58x_core.h"
 
-#define DRV_VERSION "1.00"
 MODULE_AUTHOR("Vincent Mailhol <mailhol.vincent@wanadoo.fr>");
 MODULE_AUTHOR("Arunachalam Santhanam <arunachalam.santhanam@in.bosch.com>");
 MODULE_DESCRIPTION("Socket CAN driver for ETAS ES58X USB adapters");
-MODULE_VERSION(DRV_VERSION);
 MODULE_LICENSE("GPL v2");
 
-#define ES58X_MODULE_NAME "etas_es58x"
 #define ES58X_VENDOR_ID 0x108C
 #define ES581_4_PRODUCT_ID 0x0159
 #define ES582_1_PRODUCT_ID 0x0168
@@ -59,11 +57,11 @@ MODULE_DEVICE_TABLE(usb, es58x_id_table);
 
 #define es58x_print_hex_dump(buf, len)					\
 	print_hex_dump(KERN_DEBUG,					\
-		       ES58X_MODULE_NAME " " __stringify(buf) ": ",	\
+		       KBUILD_MODNAME " " __stringify(buf) ": ",	\
 		       DUMP_PREFIX_NONE, 16, 1, buf, len, false)
 
 #define es58x_print_hex_dump_debug(buf, len)				 \
-	print_hex_dump_debug(ES58X_MODULE_NAME " " __stringify(buf) ": ",\
+	print_hex_dump_debug(KBUILD_MODNAME " " __stringify(buf) ": ",\
 			     DUMP_PREFIX_NONE, 16, 1, buf, len, false)
 
 /* The last two bytes of an ES58X command is a CRC16. The first two
@@ -1462,10 +1460,6 @@ static void es58x_read_bulk_callback(struct urb *urb)
 	}
 
  resubmit_urb:
-	usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->rx_pipe,
-			  urb->transfer_buffer, urb->transfer_buffer_length,
-			  es58x_read_bulk_callback, es58x_dev);
-
 	ret = usb_submit_urb(urb, GFP_ATOMIC);
 	if (ret == -ENODEV) {
 		for (i = 0; i < es58x_dev->num_can_ch; i++)
@@ -1599,7 +1593,8 @@ static struct urb *es58x_get_tx_urb(struct es58x_device *es58x_dev)
 			return NULL;
 
 		usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->tx_pipe,
-				  buf, tx_buf_len, NULL, NULL);
+				  buf, tx_buf_len, es58x_write_bulk_callback,
+				  NULL);
 		return urb;
 	}
 
@@ -1632,9 +1627,7 @@ static int es58x_submit_urb(struct es58x_device *es58x_dev, struct urb *urb,
 	int ret;
 
 	es58x_set_crc(urb->transfer_buffer, urb->transfer_buffer_length);
-	usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->tx_pipe,
-			  urb->transfer_buffer, urb->transfer_buffer_length,
-			  es58x_write_bulk_callback, netdev);
+	urb->context = netdev;
 	usb_anchor_urb(urb, &es58x_dev->tx_urbs_busy);
 	ret = usb_submit_urb(urb, GFP_ATOMIC);
 	if (ret) {
@@ -1981,7 +1974,12 @@ static netdev_tx_t es58x_start_xmit(struct sk_buff *skb,
 static const struct net_device_ops es58x_netdev_ops = {
 	.ndo_open = es58x_open,
 	.ndo_stop = es58x_stop,
-	.ndo_start_xmit = es58x_start_xmit
+	.ndo_start_xmit = es58x_start_xmit,
+	.ndo_eth_ioctl = can_eth_ioctl_hwts,
+};
+
+static const struct ethtool_ops es58x_ethtool_ops = {
+	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
 };
 
 /**
@@ -2088,6 +2086,7 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
 	es58x_init_priv(es58x_dev, es58x_priv(netdev), channel_idx);
 
 	netdev->netdev_ops = &es58x_netdev_ops;
+	netdev->ethtool_ops = &es58x_ethtool_ops;
 	netdev->flags |= IFF_ECHO;	/* We support local echo */
 	netdev->dev_port = channel_idx;
 
@@ -2181,9 +2180,8 @@ static struct es58x_device *es58x_init_es58x_dev(struct usb_interface *intf,
 	struct usb_endpoint_descriptor *ep_in, *ep_out;
 	int ret;
 
-	dev_info(dev,
-		 "Starting %s %s (Serial Number %s) driver version %s\n",
-		 udev->manufacturer, udev->product, udev->serial, DRV_VERSION);
+	dev_info(dev, "Starting %s %s (Serial Number %s)\n",
+		 udev->manufacturer, udev->product, udev->serial);
 
 	ret = usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out,
 					NULL, NULL);
@@ -2280,7 +2278,7 @@ static void es58x_disconnect(struct usb_interface *intf)
 }
 
 static struct usb_driver es58x_driver = {
-	.name = ES58X_MODULE_NAME,
+	.name = KBUILD_MODNAME,
 	.probe = es58x_probe,
 	.disconnect = es58x_disconnect,
 	.id_table = es58x_id_table

drivers/net/can/usb/gs_usb.c

@@ -946,6 +946,7 @@ static int gs_usb_set_phys_id(struct net_device *dev,
 
 static const struct ethtool_ops gs_usb_ethtool_ops = {
 	.set_phys_id = gs_usb_set_phys_id,
+	.get_ts_info = ethtool_op_get_ts_info,
 };
 
 static struct gs_can *gs_make_candev(unsigned int channel,
@@ -989,11 +990,12 @@ static struct gs_can *gs_make_candev(unsigned int channel,
 	dev = netdev_priv(netdev);
 
 	netdev->netdev_ops = &gs_usb_netdev_ops;
+	netdev->ethtool_ops = &gs_usb_ethtool_ops;
 
 	netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
 
 	/* dev setup */
-	strcpy(dev->bt_const.name, "gs_usb");
+	strcpy(dev->bt_const.name, KBUILD_MODNAME);
 	dev->bt_const.tseg1_min = le32_to_cpu(bt_const->tseg1_min);
 	dev->bt_const.tseg1_max = le32_to_cpu(bt_const->tseg1_max);
 	dev->bt_const.tseg2_min = le32_to_cpu(bt_const->tseg2_min);
@@ -1100,7 +1102,7 @@ static struct gs_can *gs_make_candev(unsigned int channel,
 			return ERR_PTR(rc);
 		}
 
-		strcpy(dev->data_bt_const.name, "gs_usb");
+		strcpy(dev->data_bt_const.name, KBUILD_MODNAME);
 		dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const_extended->dtseg1_min);
 		dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const_extended->dtseg1_max);
 		dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const_extended->dtseg2_min);
@@ -1270,7 +1272,7 @@ static const struct usb_device_id gs_usb_table[] = {
 MODULE_DEVICE_TABLE(usb, gs_usb_table);
 
 static struct usb_driver gs_usb_driver = {
-	.name = "gs_usb",
+	.name = KBUILD_MODNAME,
 	.probe = gs_usb_probe,
 	.disconnect = gs_usb_disconnect,
 	.id_table = gs_usb_table,

drivers/net/can/usb/kvaser_usb/kvaser_usb.h

@@ -39,6 +39,7 @@
 #define KVASER_USB_QUIRK_HAS_SILENT_MODE	BIT(0)
 #define KVASER_USB_QUIRK_HAS_TXRX_ERRORS	BIT(1)
 #define KVASER_USB_QUIRK_IGNORE_CLK_FREQ	BIT(2)
+#define KVASER_USB_QUIRK_HAS_HARDWARE_TIMESTAMP	BIT(3)
 
 /* Device capabilities */
 #define KVASER_USB_CAP_BERR_CAP			0x01

drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c

@@ -13,6 +13,7 @@
 
 #include <linux/completion.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/gfp.h>
 #include <linux/if.h>
 #include <linux/kernel.h>
@@ -89,7 +90,7 @@
 #define USB_HYBRID_PRO_CANLIN_PRODUCT_ID	278
 
 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_hydra = {
-	.quirks = 0,
+	.quirks = KVASER_USB_QUIRK_HAS_HARDWARE_TIMESTAMP,
 	.ops = &kvaser_usb_hydra_dev_ops,
 };
 
@@ -665,6 +666,22 @@ static const struct net_device_ops kvaser_usb_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct net_device_ops kvaser_usb_netdev_ops_hwts = {
+	.ndo_open = kvaser_usb_open,
+	.ndo_stop = kvaser_usb_close,
+	.ndo_eth_ioctl = can_eth_ioctl_hwts,
+	.ndo_start_xmit = kvaser_usb_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct ethtool_ops kvaser_usb_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
+static const struct ethtool_ops kvaser_usb_ethtool_ops_hwts = {
+	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
+};
+
 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
 {
 	int i;
@@ -742,7 +759,13 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
 	netdev->flags |= IFF_ECHO;
 
 	netdev->netdev_ops = &kvaser_usb_netdev_ops;
-
+	if (driver_info->quirks & KVASER_USB_QUIRK_HAS_HARDWARE_TIMESTAMP) {
+		netdev->netdev_ops = &kvaser_usb_netdev_ops_hwts;
+		netdev->ethtool_ops = &kvaser_usb_ethtool_ops_hwts;
+	} else {
+		netdev->netdev_ops = &kvaser_usb_netdev_ops;
+		netdev->ethtool_ops = &kvaser_usb_ethtool_ops;
+	}
 	SET_NETDEV_DEV(netdev, &dev->intf->dev);
 	netdev->dev_id = channel;
 
@@ -869,7 +892,7 @@ static void kvaser_usb_disconnect(struct usb_interface *intf)
 }
 
 static struct usb_driver kvaser_usb_driver = {
-	.name = "kvaser_usb",
+	.name = KBUILD_MODNAME,
 	.probe = kvaser_usb_probe,
 	.disconnect = kvaser_usb_disconnect,
 	.id_table = kvaser_usb_table,

drivers/net/can/usb/mcba_usb.c

@@ -10,6 +10,7 @@
 #include <linux/can.h>
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/signal.h>
@@ -758,6 +759,10 @@ static const struct net_device_ops mcba_netdev_ops = {
 	.ndo_start_xmit = mcba_usb_start_xmit,
 };
 
+static const struct ethtool_ops mcba_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 /* Microchip CANBUS has hardcoded bittiming values by default.
  * This function sends request via USB to change the speed and align bittiming
  * values for presentation purposes only
@@ -836,6 +841,7 @@ static int mcba_usb_probe(struct usb_interface *intf,
 	priv->can.do_set_bittiming = mcba_net_set_bittiming;
 
 	netdev->netdev_ops = &mcba_netdev_ops;
+	netdev->ethtool_ops = &mcba_ethtool_ops;
 
 	netdev->flags |= IFF_ECHO; /* we support local echo */
 

drivers/net/can/usb/peak_usb/pcan_usb.c

@@ -965,6 +965,7 @@ static int pcan_usb_set_phys_id(struct net_device *netdev,
 
 static const struct ethtool_ops pcan_usb_ethtool_ops = {
 	.set_phys_id = pcan_usb_set_phys_id,
+	.get_ts_info = pcan_get_ts_info,
 };
 
 /*

drivers/net/can/usb/peak_usb/pcan_usb_core.c

@@ -775,13 +775,54 @@ static int peak_usb_set_data_bittiming(struct net_device *netdev)
 	return 0;
 }
 
+static int peak_eth_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct hwtstamp_config hwts_cfg = { 0 };
+
+	switch (cmd) {
+	case SIOCSHWTSTAMP: /* set */
+		if (copy_from_user(&hwts_cfg, ifr->ifr_data, sizeof(hwts_cfg)))
+			return -EFAULT;
+		if (hwts_cfg.tx_type == HWTSTAMP_TX_OFF &&
+		    hwts_cfg.rx_filter == HWTSTAMP_FILTER_ALL)
+			return 0;
+		return -ERANGE;
+
+	case SIOCGHWTSTAMP: /* get */
+		hwts_cfg.tx_type = HWTSTAMP_TX_OFF;
+		hwts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+		if (copy_to_user(ifr->ifr_data, &hwts_cfg, sizeof(hwts_cfg)))
+			return -EFAULT;
+		return 0;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static const struct net_device_ops peak_usb_netdev_ops = {
 	.ndo_open = peak_usb_ndo_open,
 	.ndo_stop = peak_usb_ndo_stop,
+	.ndo_eth_ioctl = peak_eth_ioctl,
 	.ndo_start_xmit = peak_usb_ndo_start_xmit,
 	.ndo_change_mtu = can_change_mtu,
 };
 
+int pcan_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
+{
+	info->so_timestamping =
+		SOF_TIMESTAMPING_TX_SOFTWARE |
+		SOF_TIMESTAMPING_RX_SOFTWARE |
+		SOF_TIMESTAMPING_SOFTWARE |
+		SOF_TIMESTAMPING_RX_HARDWARE |
+		SOF_TIMESTAMPING_RAW_HARDWARE;
+	info->phc_index = -1;
+	info->tx_types = BIT(HWTSTAMP_TX_OFF);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+
 /*
  * create one device which is attached to CAN controller #ctrl_idx of the
  * usb adapter.

drivers/net/can/usb/peak_usb/pcan_usb_core.h

@@ -145,5 +145,6 @@ int peak_usb_netif_rx(struct sk_buff *skb,
 int peak_usb_netif_rx_64(struct sk_buff *skb, u32 ts_low, u32 ts_high);
 void peak_usb_async_complete(struct urb *urb);
 void peak_usb_restart_complete(struct peak_usb_device *dev);
+int pcan_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info);
 
 #endif

drivers/net/can/usb/peak_usb/pcan_usb_fd.c

@@ -1080,6 +1080,7 @@ static int pcan_usb_fd_set_phys_id(struct net_device *netdev,
 
 static const struct ethtool_ops pcan_usb_fd_ethtool_ops = {
 	.set_phys_id = pcan_usb_fd_set_phys_id,
+	.get_ts_info = pcan_get_ts_info,
 };
 
 /* describes the PCAN-USB FD adapter */

drivers/net/can/usb/peak_usb/pcan_usb_pro.c

@@ -1022,6 +1022,7 @@ static int pcan_usb_pro_set_phys_id(struct net_device *netdev,
 
 static const struct ethtool_ops pcan_usb_pro_ethtool_ops = {
 	.set_phys_id = pcan_usb_pro_set_phys_id,
+	.get_ts_info = pcan_get_ts_info,
 };
 
 /*

drivers/net/can/usb/ucan.c

@@ -28,6 +28,7 @@
 #include <linux/can.h>
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/signal.h>
@@ -1233,6 +1234,10 @@ static const struct net_device_ops ucan_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops ucan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 /* Request to set bittiming
  *
  * This function generates an USB set bittiming message and transmits
@@ -1512,6 +1517,7 @@ static int ucan_probe(struct usb_interface *intf,
 	spin_lock_init(&up->context_lock);
 	spin_lock_init(&up->echo_skb_lock);
 	netdev->netdev_ops = &ucan_netdev_ops;
+	netdev->ethtool_ops = &ucan_ethtool_ops;
 
 	usb_set_intfdata(intf, up);
 	SET_NETDEV_DEV(netdev, &intf->dev);

drivers/net/can/usb/usb_8dev.c

@@ -12,6 +12,7 @@
  * who were very cooperative and answered my questions.
  */
 
+#include <linux/ethtool.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -870,8 +871,12 @@ static const struct net_device_ops usb_8dev_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
+static const struct ethtool_ops usb_8dev_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static const struct can_bittiming_const usb_8dev_bittiming_const = {
-	.name = "usb_8dev",
+	.name = KBUILD_MODNAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
 	.tseg2_min = 1,
@@ -927,6 +932,7 @@ static int usb_8dev_probe(struct usb_interface *intf,
 				      CAN_CTRLMODE_CC_LEN8_DLC;
 
 	netdev->netdev_ops = &usb_8dev_netdev_ops;
+	netdev->ethtool_ops = &usb_8dev_ethtool_ops;
 
 	netdev->flags |= IFF_ECHO; /* we support local echo */
 
@@ -997,7 +1003,7 @@ static void usb_8dev_disconnect(struct usb_interface *intf)
 }
 
 static struct usb_driver usb_8dev_driver = {
-	.name =		"usb_8dev",
+	.name =		KBUILD_MODNAME,
 	.probe =	usb_8dev_probe,
 	.disconnect =	usb_8dev_disconnect,
 	.id_table =	usb_8dev_table,

drivers/net/can/vcan.c

@@ -40,6 +40,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
@@ -99,6 +100,8 @@ static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev)
 	/* set flag whether this packet has to be looped back */
 	loop = skb->pkt_type == PACKET_LOOPBACK;
 
+	skb_tx_timestamp(skb);
+
 	if (!echo) {
 		/* no echo handling available inside this driver */
 		if (loop) {
@@ -146,6 +149,10 @@ static const struct net_device_ops vcan_netdev_ops = {
 	.ndo_change_mtu = vcan_change_mtu,
 };
 
+static const struct ethtool_ops vcan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static void vcan_setup(struct net_device *dev)
 {
 	dev->type		= ARPHRD_CAN;
@@ -161,6 +168,7 @@ static void vcan_setup(struct net_device *dev)
 		dev->flags |= IFF_ECHO;
 
 	dev->netdev_ops		= &vcan_netdev_ops;
+	dev->ethtool_ops	= &vcan_ethtool_ops;
 	dev->needs_free_netdev	= true;
 }
 

drivers/net/can/vxcan.c

@@ -9,6 +9,7 @@
  * Copyright (c) 2017 Oliver Hartkopp <socketcan@hartkopp.net>
  */
 
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
@@ -53,6 +54,8 @@ static netdev_tx_t vxcan_xmit(struct sk_buff *oskb, struct net_device *dev)
 		goto out_unlock;
 	}
 
+	skb_tx_timestamp(oskb);
+
 	skb = skb_clone(oskb, GFP_ATOMIC);
 	if (skb) {
 		consume_skb(oskb);
@@ -144,6 +147,10 @@ static const struct net_device_ops vxcan_netdev_ops = {
 	.ndo_change_mtu = vxcan_change_mtu,
 };
 
+static const struct ethtool_ops vxcan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 static void vxcan_setup(struct net_device *dev)
 {
 	struct can_ml_priv *can_ml;
@@ -155,6 +162,7 @@ static void vxcan_setup(struct net_device *dev)
 	dev->tx_queue_len	= 0;
 	dev->flags		= IFF_NOARP;
 	dev->netdev_ops		= &vxcan_netdev_ops;
+	dev->ethtool_ops	= &vxcan_ethtool_ops;
 	dev->needs_free_netdev	= true;
 
 	can_ml = netdev_priv(dev) + ALIGN(sizeof(struct vxcan_priv), NETDEV_ALIGN);

drivers/net/can/xilinx_can.c

@@ -12,6 +12,7 @@
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/errno.h>
+#include <linux/ethtool.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -1540,6 +1541,10 @@ static const struct net_device_ops xcan_netdev_ops = {
 	.ndo_change_mtu	= can_change_mtu,
 };
 
+static const struct ethtool_ops xcan_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
 /**
  * xcan_suspend - Suspend method for the driver
  * @dev:	Address of the device structure
@@ -1821,6 +1826,7 @@ static int xcan_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ndev);
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 	ndev->netdev_ops = &xcan_netdev_ops;
+	ndev->ethtool_ops = &xcan_ethtool_ops;
 
 	/* Getting the CAN can_clk info */
 	priv->can_clk = devm_clk_get(&pdev->dev, "can_clk");

include/linux/can/dev.h

@@ -20,6 +20,7 @@
 #include <linux/can/length.h>
 #include <linux/can/netlink.h>
 #include <linux/can/skb.h>
+#include <linux/ethtool.h>
 #include <linux/netdevice.h>
 
 /*
@@ -162,6 +163,9 @@ struct can_priv *safe_candev_priv(struct net_device *dev);
 int open_candev(struct net_device *dev);
 void close_candev(struct net_device *dev);
 int can_change_mtu(struct net_device *dev, int new_mtu);
+int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd);
+int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
+				    struct ethtool_ts_info *info);
 
 int register_candev(struct net_device *dev);
 void unregister_candev(struct net_device *dev);