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can: tree-wide: advertise software timestamping capabilities

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Currently, some CAN drivers support hardware timestamping, some do
not. But userland has no method to query which features are supported
(aside maybe of getting RX messages and observe whether or not
hardware timestamps stay at zero).

The canonical way for a network driver to advertised what kind of
timestamping it supports is to implement ethtool_ops::get_ts_info().

This patch only targets the CAN drivers which *do not* support
hardware timestamping.  For each of those CAN drivers, implement the
get_ts_info() using the generic ethtool_op_get_ts_info().

This way, userland can do:

| $ ethtool --show-time-stamping canX

to confirm the device timestamping capacities.

N.B. the drivers which support hardware timestamping will be migrated
in separate patches.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20220727101641.198847-6-mailhol.vincent@wanadoo.fr
[mkl: mscan: add missing mscan_ethtool_ops]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol
2022-07-27 19:16:32 +09:00
committed by Marc Kleine-Budde
parent 6a37a28b18
commit 409c188c57
30 changed files with 159 additions and 0 deletions
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5
drivers/net/can/can327.c
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@ -850,6 +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'] = {
@ -1034,6 +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;