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| author | Vincent Mailhol <mailhol.vincent@wanadoo.fr> | 2022-07-27 19:16:32 +0900 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-07-28 11:44:01 +0200 |
| commit | 409c188c57cdb5cb1dfcac79e72b5169f0463fe4 (patch) | |
| tree | 7a1f501d9a814c5d8730d9d090a2595b015ab0d8 /drivers/net/can/rcar/rcar_canfd.c | |
| parent | 6a37a28b1864c447a20a1609f90f3e2dfaff0705 (diff) | |
| download | lwn-409c188c57cdb5cb1dfcac79e72b5169f0463fe4.tar.gz lwn-409c188c57cdb5cb1dfcac79e72b5169f0463fe4.zip | |
can: tree-wide: advertise software timestamping capabilities
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>
Diffstat (limited to 'drivers/net/can/rcar/rcar_canfd.c')
| -rw-r--r-- | drivers/net/can/rcar/rcar_canfd.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c index d3e569a02b4d..27085b796e75 100644 --- a/drivers/net/can/rcar/rcar_canfd.c +++ b/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; |