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Subject[PATCH 1/1] net: stmmac: implement the SIOCGHWTSTAMP ioctl
Date
From: Tema <panfilovartyom@gmail.com>

This patch adds support for the SIOCGHWTSTAMP ioctl which enables user
processes to read the current hwtstamp_config settings
non-destructively.

Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 +
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 77 ++++++++++++-------
2 files changed, 52 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 63e1064b27a2..f9b42b0c20f4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -28,6 +28,7 @@
#include <linux/pci.h>
#include "common.h"
#include <linux/ptp_clock_kernel.h>
+#include <linux/net_tstamp.h>
#include <linux/reset.h>

struct stmmac_resources {
@@ -174,6 +175,7 @@ struct stmmac_priv {
unsigned int mode;
unsigned int chain_mode;
int extend_desc;
+ struct hwtstamp_config tstamp_config;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_clock_ops;
unsigned int default_addend;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5afba69981cf..a6dc40a70428 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -534,7 +534,7 @@ static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
}

/**
- * stmmac_hwtstamp_ioctl - control hardware timestamping.
+ * stmmac_hwtstamp_set - control hardware timestamping.
* @dev: device pointer.
* @ifr: An IOCTL specific structure, that can contain a pointer to
* a proprietary structure used to pass information to the driver.
@@ -544,10 +544,10 @@ static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
* Return Value:
* 0 on success and an appropriate -ve integer on failure.
*/
-static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
+static int stmmac_hwtstamp_set(struct net_device *dev, struct ifreq *ifr)
{
struct stmmac_priv *priv = netdev_priv(dev);
- struct hwtstamp_config config;
+ struct hwtstamp_config *config = &priv->tstamp_config;
struct timespec64 now;
u64 temp = 0;
u32 ptp_v2 = 0;
@@ -572,31 +572,31 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
return -EOPNOTSUPP;
}

- if (copy_from_user(&config, ifr->ifr_data,
+ if (copy_from_user(config, ifr->ifr_data,
sizeof(struct hwtstamp_config)))
return -EFAULT;

netdev_dbg(priv->dev, "%s config flags:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
- __func__, config.flags, config.tx_type, config.rx_filter);
+ __func__, config->flags, config->tx_type, config->rx_filter);

/* reserved for future extensions */
- if (config.flags)
+ if (config->flags)
return -EINVAL;

- if (config.tx_type != HWTSTAMP_TX_OFF &&
- config.tx_type != HWTSTAMP_TX_ON)
+ if (config->tx_type != HWTSTAMP_TX_OFF &&
+ config->tx_type != HWTSTAMP_TX_ON)
return -ERANGE;

if (priv->adv_ts) {
- switch (config.rx_filter) {
+ switch (config->rx_filter) {
case HWTSTAMP_FILTER_NONE:
/* time stamp no incoming packet at all */
- config.rx_filter = HWTSTAMP_FILTER_NONE;
+ config->rx_filter = HWTSTAMP_FILTER_NONE;
break;

case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
/* PTP v1, UDP, any kind of event packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
/* take time stamp for all event messages */
if (xmac)
snap_type_sel = PTP_GMAC4_TCR_SNAPTYPSEL_1;
@@ -609,7 +609,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
/* PTP v1, UDP, Sync packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_SYNC;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_SYNC;
/* take time stamp for SYNC messages only */
ts_event_en = PTP_TCR_TSEVNTENA;

@@ -619,7 +619,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
/* PTP v1, UDP, Delay_req packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ;
/* take time stamp for Delay_Req messages only */
ts_master_en = PTP_TCR_TSMSTRENA;
ts_event_en = PTP_TCR_TSEVNTENA;
@@ -630,7 +630,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
/* PTP v2, UDP, any kind of event packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for all event messages */
if (xmac)
@@ -644,7 +644,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
/* PTP v2, UDP, Sync packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_SYNC;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_SYNC;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for SYNC messages only */
ts_event_en = PTP_TCR_TSEVNTENA;
@@ -655,7 +655,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
/* PTP v2, UDP, Delay_req packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for Delay_Req messages only */
ts_master_en = PTP_TCR_TSMSTRENA;
@@ -667,7 +667,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_EVENT:
/* PTP v2/802.AS1 any layer, any kind of event packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for all event messages */
if (xmac)
@@ -682,7 +682,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_SYNC:
/* PTP v2/802.AS1, any layer, Sync packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_SYNC;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_SYNC;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for SYNC messages only */
ts_event_en = PTP_TCR_TSEVNTENA;
@@ -694,7 +694,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)

case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
/* PTP v2/802.AS1, any layer, Delay_req packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V2_DELAY_REQ;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_DELAY_REQ;
ptp_v2 = PTP_TCR_TSVER2ENA;
/* take time stamp for Delay_Req messages only */
ts_master_en = PTP_TCR_TSMSTRENA;
@@ -708,7 +708,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
case HWTSTAMP_FILTER_NTP_ALL:
case HWTSTAMP_FILTER_ALL:
/* time stamp any incoming packet */
- config.rx_filter = HWTSTAMP_FILTER_ALL;
+ config->rx_filter = HWTSTAMP_FILTER_ALL;
tstamp_all = PTP_TCR_TSENALL;
break;

@@ -716,18 +716,18 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
return -ERANGE;
}
} else {
- switch (config.rx_filter) {
+ switch (config->rx_filter) {
case HWTSTAMP_FILTER_NONE:
- config.rx_filter = HWTSTAMP_FILTER_NONE;
+ config->rx_filter = HWTSTAMP_FILTER_NONE;
break;
default:
/* PTP v1, UDP, any kind of event packet */
- config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
break;
}
}
- priv->hwts_rx_en = ((config.rx_filter == HWTSTAMP_FILTER_NONE) ? 0 : 1);
- priv->hwts_tx_en = config.tx_type == HWTSTAMP_TX_ON;
+ priv->hwts_rx_en = ((config->rx_filter == HWTSTAMP_FILTER_NONE) ? 0 : 1);
+ priv->hwts_tx_en = config->tx_type == HWTSTAMP_TX_ON;

if (!priv->hwts_tx_en && !priv->hwts_rx_en)
stmmac_config_hw_tstamping(priv, priv->ptpaddr, 0);
@@ -765,7 +765,28 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
(u32)now.tv_sec, now.tv_nsec);
}

- return copy_to_user(ifr->ifr_data, &config,
+ return copy_to_user(ifr->ifr_data, config,
+ sizeof(struct hwtstamp_config)) ? -EFAULT : 0;
+}
+
+/**
+ * stmmac_hwtstamp_get - read hardware timestamping.
+ * @dev: device pointer.
+ * @ifr: An IOCTL specific structure, that can contain a pointer to
+ * a proprietary structure used to pass information to the driver.
+ * Description:
+ * This function obtain the current hardware timestamping settings
+ as requested.
+ */
+static int stmmac_hwtstamp_get(struct net_device *dev, struct ifreq *ifr)
+{
+ struct stmmac_priv *priv = netdev_priv(dev);
+ struct hwtstamp_config *config = &priv->tstamp_config;
+
+ if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp))
+ return -EOPNOTSUPP;
+
+ return copy_to_user(ifr->ifr_data, config,
sizeof(struct hwtstamp_config)) ? -EFAULT : 0;
}

@@ -3767,7 +3788,9 @@ static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
ret = phy_mii_ioctl(dev->phydev, rq, cmd);
break;
case SIOCSHWTSTAMP:
- ret = stmmac_hwtstamp_ioctl(dev, rq);
+ ret = stmmac_hwtstamp_set(dev, rq);
+ case SIOCGHWTSTAMP:
+ ret = stmmac_hwtstamp_get(dev, rq);
break;
default:
break;
--
2.19.1
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