[PATCH v2 09/14] can: mcp251xfd: advertise timestamping capabilities and add ioctl support

[Vincent Mailhol <mailhol.vincent@wanadoo.fr>]

Currently, userland has no methods to query which timestamping
features are supported by the mcp251xfd driver (aside maybe of getting
RX messages and obseverse whether or not hardware timestamps stay at
zero).

The canonical way for a network driver to advertise what kind of
timestamping it supports is to implement
ethtool_ops::get_ts_info(). Here, we use the CAN specific
can_ethtool_op_get_ts_info_hwts() function to achieve this.

In addition, the driver currently does not support the hardware
timestamps ioctls. According to [1], SIOCSHWTSTAMP is "must" and
SIOCGHWTSTAMP is "should". This patch fills up that gap by
implementing net_device_ops::ndo_eth_ioctl() using the CAN specific
function can_eth_ioctl_hwts().

[1] kernel doc Timestamping, section 3.1: "Hardware Timestamping
Implementation: Device Drivers"
Link: https://docs.kernel.org/networking/timestamping.html#hardware-timestamping-implementation-device-drivers

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 7fc86ed405c6..5cd2c296d1c9 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -16,6 +16,7 @@
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
@@ -1671,9 +1672,14 @@ 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,
 };
 
+static const struct ethtool_ops mcp251xfd_ethtool_ops = {
+	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
+};
+
 static void
 mcp251xfd_register_quirks(struct mcp251xfd_priv *priv)
 {
@@ -2050,6 +2056,7 @@ static int mcp251xfd_probe(struct spi_device *spi)
 	SET_NETDEV_DEV(ndev, &spi->dev);
 
 	ndev->netdev_ops = &mcp251xfd_netdev_ops;
+	ndev->ethtool_ops = &mcp251xfd_ethtool_ops;
 	ndev->irq = spi->irq;
 	ndev->flags |= IFF_ECHO;
 
-- 
2.35.1