[Patch net-next v1 02/12] net: dsa: microchip: ptp: Initial hardware time stamping support

Arun Ramadoss
2022-11-28T10:33:39Z

From: Christian Eggers <ceggers@arri.de>

This patch adds the routine for get_ts_info, hwstamp_get, set. This enables
the PTP support towards userspace applications such as linuxptp.
Tx timestamping can be enabled per port and Rx timestamping enabled
globally.

Signed-off-by: Christian Eggers <ceggers@arri.de>
Co-developed-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>

---
RFC v2 -> Patch v1
- moved tagger set and get function to separate patch
- Removed unnecessary comments
---
drivers/net/dsa/microchip/ksz_common.c | 2 +
drivers/net/dsa/microchip/ksz_common.h | 4 ++
drivers/net/dsa/microchip/ksz_ptp.c | 77 +++++++++++++++++++++++++-
drivers/net/dsa/microchip/ksz_ptp.h | 14 +++++
4 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 2d09cd141db6..7b85b258270c 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2873,6 +2873,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
.port_change_mtu = ksz_change_mtu,
.port_max_mtu = ksz_max_mtu,
.get_ts_info = ksz_get_ts_info,
+ .port_hwtstamp_get = ksz_hwtstamp_get,
+ .port_hwtstamp_set = ksz_hwtstamp_set,
};

struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 5a6bfd42c6f9..cd20f39a565f 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -103,6 +103,10 @@ struct ksz_port {
struct ksz_device *ksz_dev;
struct ksz_irq pirq;
u8 num;
+#if IS_ENABLED(CONFIG_NET_DSA_MICROCHIP_KSZ_PTP)
+ u8 hwts_tx_en;
+ bool hwts_rx_en;
+#endif
};

struct ksz_device {
diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c
index c737635ca266..a41418c6adf6 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.c
+++ b/drivers/net/dsa/microchip/ksz_ptp.c
@@ -36,15 +36,88 @@ int ksz_get_ts_info(struct dsa_switch *ds, int port, struct ethtool_ts_info *ts)
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;

- ts->tx_types = BIT(HWTSTAMP_TX_OFF);
+ ts->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ONESTEP_P2P);

- ts->rx_filters = BIT(HWTSTAMP_FILTER_NONE);
+ ts->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | BIT(HWTSTAMP_FILTER_ALL);

ts->phc_index = ptp_clock_index(ptp_data->clock);

return 0;
}

+int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
+{
+ struct ksz_device *dev = ds->priv;
+ struct hwtstamp_config config;
+
+ config.flags = 0;
+
+ config.tx_type = dev->ports[port].hwts_tx_en;
+
+ if (dev->ports[port].hwts_rx_en)
+ config.rx_filter = HWTSTAMP_FILTER_ALL;
+ else
+ config.rx_filter = HWTSTAMP_FILTER_NONE;
+
+ return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+static int ksz_set_hwtstamp_config(struct ksz_device *dev, int port,
+ struct hwtstamp_config *config)
+{
+ struct ksz_port *prt = &dev->ports[port];
+
+ if (config->flags)
+ return -EINVAL;
+
+ switch (config->tx_type) {
+ case HWTSTAMP_TX_OFF:
+ case HWTSTAMP_TX_ONESTEP_P2P:
+ prt->hwts_tx_en = config->tx_type;
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ switch (config->rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ prt->hwts_rx_en = false;
+ break;
+ default:
+ prt->hwts_rx_en = true;
+ break;
+ }
+
+ return 0;
+}
+
+int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
+{
+ struct ksz_device *dev = ds->priv;
+ struct ksz_ptp_data *ptp_data;
+ struct hwtstamp_config config;
+ int ret;
+
+ ptp_data = &dev->ptp_data;
+
+ mutex_lock(&ptp_data->lock);
+
+ ret = copy_from_user(&config, ifr->ifr_data, sizeof(config));
+ if (ret)
+ goto error_return;
+
+ ret = ksz_set_hwtstamp_config(dev, port, &config);
+ if (ret)
+ goto error_return;
+
+ ret = copy_to_user(ifr->ifr_data, &config, sizeof(config));
+
+error_return:
+ mutex_unlock(&ptp_data->lock);
+ return ret;
+}
+
static int _ksz_ptp_gettime(struct ksz_device *dev, struct timespec64 *ts)
{
u32 nanoseconds;
diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h
index ea9fa46caa01..17f455c3b2c5 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.h
+++ b/drivers/net/dsa/microchip/ksz_ptp.h
@@ -23,6 +23,8 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds);

int ksz_get_ts_info(struct dsa_switch *ds, int port,
struct ethtool_ts_info *ts);
+int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
+int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);

#else

@@ -40,6 +42,18 @@ static inline void ksz_ptp_clock_unregister(struct dsa_switch *ds) { }

#define ksz_get_ts_info NULL

+static inline int ksz_hwtstamp_get(struct dsa_switch *ds, int port,
+ struct ifreq *ifr)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int ksz_hwtstamp_set(struct dsa_switch *ds, int port,
+ struct ifreq *ifr)
+{
+ return -EOPNOTSUPP;
+}
+
#endif /* End of CONFIG_NET_DSA_MICROCHIP_KSZ_PTP */

#endif
--
2.36.1