[PATCH RFC V1 net-next 1/4] net: ethtool: Refactor identical get_ts_info implementations.

[Richard Cochran <richardcochran@gmail.com>]

Both the vlan and the bonding drivers call their "real" device driver
in order to report the time stamping capabilities.  Provide a core
ethtool helper function to avoid copy/paste in the stack.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
---
 drivers/net/bonding/bond_main.c | 14 ++------------
 include/linux/ethtool.h         |  8 ++++++++
 net/8021q/vlan_dev.c            | 15 +--------------
 net/ethtool/common.c            |  6 ++++++
 4 files changed, 17 insertions(+), 26 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index b60e22f6394a..f28b88b67b9e 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -5353,23 +5353,13 @@ static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
 				    struct ethtool_ts_info *info)
 {
 	struct bonding *bond = netdev_priv(bond_dev);
-	const struct ethtool_ops *ops;
 	struct net_device *real_dev;
-	struct phy_device *phydev;
 
 	rcu_read_lock();
 	real_dev = bond_option_active_slave_get_rcu(bond);
 	rcu_read_unlock();
-	if (real_dev) {
-		ops = real_dev->ethtool_ops;
-		phydev = real_dev->phydev;
-
-		if (phy_has_tsinfo(phydev)) {
-			return phy_ts_info(phydev, info);
-		} else if (ops->get_ts_info) {
-			return ops->get_ts_info(real_dev, info);
-		}
-	}
+	if (real_dev)
+		return ethtool_get_ts_info_by_layer(real_dev, info);
 
 	info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 				SOF_TIMESTAMPING_SOFTWARE;
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index a26f37a27167..1d72344493bb 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -824,6 +824,14 @@ ethtool_params_from_link_mode(struct ethtool_link_ksettings *link_ksettings,
  */
 int ethtool_get_phc_vclocks(struct net_device *dev, int **vclock_index);
 
+/**
+ * ethtool_get_ts_info_by_layer - Obtains time stamping capabilities from the MAC or PHY layer.
+ * @dev: pointer to net_device structure
+ * @info: buffer to hold the result
+ * Returns zero on sauces, non-zero otherwise.
+ */
+int ethtool_get_ts_info_by_layer(struct net_device *dev, struct ethtool_ts_info *info);
+
 /**
  * ethtool_sprintf - Write formatted string to ethtool string data
  * @data: Pointer to start of string to update
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 26d031a43cc1..c645d7c46d78 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -679,20 +679,7 @@ static int vlan_ethtool_get_ts_info(struct net_device *dev,
 				    struct ethtool_ts_info *info)
 {
 	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
-	const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
-	struct phy_device *phydev = vlan->real_dev->phydev;
-
-	if (phy_has_tsinfo(phydev)) {
-		return phy_ts_info(phydev, info);
-	} else if (ops->get_ts_info) {
-		return ops->get_ts_info(vlan->real_dev, info);
-	} else {
-		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
-			SOF_TIMESTAMPING_SOFTWARE;
-		info->phc_index = -1;
-	}
-
-	return 0;
+	return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
 }
 
 static void vlan_dev_get_stats64(struct net_device *dev,
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 0c5210015911..651d18eef589 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -569,6 +569,12 @@ int ethtool_get_phc_vclocks(struct net_device *dev, int **vclock_index)
 }
 EXPORT_SYMBOL(ethtool_get_phc_vclocks);
 
+int ethtool_get_ts_info_by_layer(struct net_device *dev, struct ethtool_ts_info *info)
+{
+	return __ethtool_get_ts_info(dev, info);
+}
+EXPORT_SYMBOL(ethtool_get_ts_info_by_layer);
+
 const struct ethtool_phy_ops *ethtool_phy_ops;
 
 void ethtool_set_ethtool_phy_ops(const struct ethtool_phy_ops *ops)
-- 
2.20.1