net: dsa: convert to ndo_hwtstamp_get() and ndo_hwtstamp_set()

New timestamping API was introduced in commit 66f7223039c0 ("net: add
NDOs for configuring hardware timestamping") from kernel v6.6. It is
time to convert DSA to the new API, so that the ndo_eth_ioctl() path can
be removed completely.

Move the ds->ops->port_hwtstamp_get() and ds->ops->port_hwtstamp_set()
calls from dsa_user_ioctl() to dsa_user_hwtstamp_get() and
dsa_user_hwtstamp_set().

Due to the fact that the underlying ifreq type changes to
kernel_hwtstamp_config, the drivers and the Ocelot switchdev front-end,
all hooked up directly or indirectly, must also be converted all at once.

The conversion also updates the comment from dsa_port_supports_hwtstamp(),
which is no longer true because kernel_hwtstamp_config is kernel memory
and does not need copy_to_user(). I've deliberated whether it is
necessary to also update "err != -EOPNOTSUPP" to a more general "!err",
but all drivers now either return 0 or -EOPNOTSUPP.

The existing logic from the ocelot_ioctl() function, to avoid
configuring timestamping if the PHY supports the operation, is obsoleted
by more advanced core logic in dev_set_hwtstamp_phylib().

This is only a partial preparation for proper PHY timestamping support.
None of these switch driver currently sets up PTP traps for PHY
timestamping, so setting dev->see_all_hwtstamp_requests is not yet
necessary and the conversion is relatively trivial.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # felix, sja1105, mv88e6xxx
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/20250508095236.887789-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 18 insertions, 21 deletions

diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.c b/drivers/net/dsa/sja1105/sja1105_ptp.c
index 3abc64aec411..fefe46e2a5e6 100644
--- a/drivers/net/dsa/sja1105/sja1105_ptp.c
+++ b/drivers/net/dsa/sja1105/sja1105_ptp.c
@@ -58,19 +58,17 @@ enum sja1105_ptp_clk_mode {
 #define ptp_data_to_sja1105(d) \
 		container_of((d), struct sja1105_private, ptp_data)
 
-int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
+int sja1105_hwtstamp_set(struct dsa_switch *ds, int port,
+			 struct kernel_hwtstamp_config *config,
+			 struct netlink_ext_ack *extack)
 {
 	struct sja1105_private *priv = ds->priv;
 	unsigned long hwts_tx_en, hwts_rx_en;
-	struct hwtstamp_config config;
-
-	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
-		return -EFAULT;
 
 	hwts_tx_en = priv->hwts_tx_en;
 	hwts_rx_en = priv->hwts_rx_en;
 
-	switch (config.tx_type) {
+	switch (config->tx_type) {
 	case HWTSTAMP_TX_OFF:
 		hwts_tx_en &= ~BIT(port);
 		break;
@@ -81,7 +79,7 @@ int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
 		return -ERANGE;
 	}
 
-	switch (config.rx_filter) {
+	switch (config->rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
 		hwts_rx_en &= ~BIT(port);
 		break;
@@ -92,32 +90,28 @@ int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
 		return -ERANGE;
 	}
 
-	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
-		return -EFAULT;
-
 	priv->hwts_tx_en = hwts_tx_en;
 	priv->hwts_rx_en = hwts_rx_en;
 
 	return 0;
 }
 
-int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
+int sja1105_hwtstamp_get(struct dsa_switch *ds, int port,
+			 struct kernel_hwtstamp_config *config)
 {
 	struct sja1105_private *priv = ds->priv;
-	struct hwtstamp_config config;
 
-	config.flags = 0;
+	config->flags = 0;
 	if (priv->hwts_tx_en & BIT(port))
-		config.tx_type = HWTSTAMP_TX_ON;
+		config->tx_type = HWTSTAMP_TX_ON;
 	else
-		config.tx_type = HWTSTAMP_TX_OFF;
+		config->tx_type = HWTSTAMP_TX_OFF;
 	if (priv->hwts_rx_en & BIT(port))
-		config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
+		config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 	else
-		config.rx_filter = HWTSTAMP_FILTER_NONE;
+		config->rx_filter = HWTSTAMP_FILTER_NONE;
 
-	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-		-EFAULT : 0;
+	return 0;
 }
 
 int sja1105_get_ts_info(struct dsa_switch *ds, int port,
diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.h b/drivers/net/dsa/sja1105/sja1105_ptp.h
index 8add2bd5f728..325e3777ea07 100644
--- a/drivers/net/dsa/sja1105/sja1105_ptp.h
+++ b/drivers/net/dsa/sja1105/sja1105_ptp.h
@@ -112,9 +112,12 @@ bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
 void sja1105_port_txtstamp(struct dsa_switch *ds, int port,
 			   struct sk_buff *skb);
 
-int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
+int sja1105_hwtstamp_get(struct dsa_switch *ds, int port,
+			 struct kernel_hwtstamp_config *config);
 
-int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
+int sja1105_hwtstamp_set(struct dsa_switch *ds, int port,
+			 struct kernel_hwtstamp_config *config,
+			 struct netlink_ext_ack *extack);
 
 int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
 			   struct ptp_system_timestamp *sts);