Make the dev_get_hwtstamp_phylib function accessible in prevision to use
it from ethtool to read the hwtstamp current configuration.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Change in v8:
- New patch

Change in v10:
- Remove export symbol as ethtool can't be built as a module.
- Move the declaration to net/core/dev.h instead of netdevice.h
---
 net/core/dev.h       | 2 ++
 net/core/dev_ioctl.c | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/core/dev.h b/net/core/dev.h
index 7881bced70a9..a1267cff715e 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -285,5 +285,7 @@ static inline void dev_xmit_recursion_dec(void)
 int dev_set_hwtstamp_phylib(struct net_device *dev,
 			    struct kernel_hwtstamp_config *cfg,
 			    struct netlink_ext_ack *extack);
+int dev_get_hwtstamp_phylib(struct net_device *dev,
+			    struct kernel_hwtstamp_config *cfg);
 
 #endif
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 46d43b950471..67cf68817f23 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -266,8 +266,8 @@ static int dev_eth_ioctl(struct net_device *dev,
  * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
  * the netdev handle the GET request.
  */
-static int dev_get_hwtstamp_phylib(struct net_device *dev,
-				   struct kernel_hwtstamp_config *cfg)
+int dev_get_hwtstamp_phylib(struct net_device *dev,
+			    struct kernel_hwtstamp_config *cfg)
 {
 	if (phy_is_default_hwtstamp(dev->phydev))
 		return phy_hwtstamp_get(dev->phydev, cfg);

-- 
2.34.1