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can: dev: add generic function can_eth_ioctl_hwts()

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Tools based on libpcap (such as tcpdump) expect the SIOCSHWTSTAMP
ioctl call to be supported. This is also specified in the kernel doc
[1]. The purpose of this ioctl is to toggle the hardware timestamps.

Currently, CAN devices which support hardware timestamping have those
always activated. can_eth_ioctl_hwts() is a dumb function that will
always succeed when requested to set tx_type to HWTSTAMP_TX_ON or
rx_filter to HWTSTAMP_FILTER_ALL.

[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>
Link: https://lore.kernel.org/all/20220727101641.198847-9-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol 2022-07-27 19:16:35 +09:00 committed by Marc Kleine-Budde
parent 7fb48d25b5
commit 90f942c5a6
2 changed files with 30 additions and 0 deletions
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29
drivers/net/can/dev/dev.c
View File

@ -322,6 +322,35 @@ 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
*/

1
include/linux/can/dev.h
View File

@ -163,6 +163,7 @@ 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);