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can: peak_canfd: advertise timestamping capabilities and add ioctl support

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

The canonical way to add hardware timestamp support is to implement
ethtool_ops::get_ts_info() in order to advertise the timestamping
capabilities and to implement net_device_ops::ndo_eth_ioctl() as
requested in [1]. Currently, the driver only supports hardware RX
timestamps [2] but not hardware TX. For this reason, the generic
function can_ethtool_op_get_ts_info_hwts() and can_eth_ioctl_hwts()
can not be reused and instead this patch adds peak_get_ts_info() and
peak_eth_ioctl().

[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

[2] https://lore.kernel.org/linux-can/20220727084257.brcbbf7lksoeekbr@pengutronix.de/

CC: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20220727101641.198847-14-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol 2022-07-27 19:16:40 +09:00 committed by Marc Kleine-Budde
parent 1d5eeda23f
commit 8ba09bfa2b
1 changed files with 48 additions and 0 deletions
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48
drivers/net/can/peak_canfd/peak_canfd.c
View File

@ -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;