Merge branch 'net-Extend-availability-of-PHY-statistics'

Florian Fainelli says:

====================
net: Extend availability of PHY statistics

This patch series adds support for retrieving PHY statistics with DSA switches
when the CPU port uses a PHY to PHY connection (as opposed to MAC to MAC).
To get there a number of things are done:

- first we move the code dealing with PHY statistics outside of net/core/ethtool.c
  and create helper functions since the same code will be reused
- then we allow network device drivers to provide an ethtool_get_phy_stats callback
  when the standard PHY library helpers are not suitable
- we update the DSA functions dealing with ethtool operations to get passed a
  stringset instead of assuming ETH_SS_STATS like they currently do
- then we provide a set of standard helpers within DSA as a framework and add
  the plumbing to allow retrieving the PHY statistics of the CPU port(s)
- finally plug support for retrieving such PHY statistics with the b53 driver

Changes in v3:

- retrict the b53 change to 539x and 531x5 series of switches
- added a change to dsa_loop.c to help test the feature

Changes in v2:

- got actual testing when the DSA master network device has a PHY that
  already provides statistics (thanks Nikita!)

- fixed the kbuild error reported when CONFIG_PHYLIB=n

- removed the checking of ops which is redundant and not needed
====================

Signed-off-by: David S. Miller <[email protected]>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/phy.h b/include/linux/phy.h
index f0b5870a6d40..6ca81395c545 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1066,6 +1066,26 @@ int phy_ethtool_nway_reset(struct net_device *ndev);
 #if IS_ENABLED(CONFIG_PHYLIB)
 int __init mdio_bus_init(void);
 void mdio_bus_exit(void);
+int phy_ethtool_get_strings(struct phy_device *phydev, u8 *data);
+int phy_ethtool_get_sset_count(struct phy_device *phydev);
+int phy_ethtool_get_stats(struct phy_device *phydev,
+			  struct ethtool_stats *stats, u64 *data);
+#else
+int phy_ethtool_get_strings(struct phy_device *phydev, u8 *data)
+{
+	return -EOPNOTSUPP;
+}
+
+int phy_ethtool_get_sset_count(struct phy_device *phydev)
+{
+	return -EOPNOTSUPP;
+}
+
+int phy_ethtool_get_stats(struct phy_device *phydev,
+			  struct ethtool_stats *stats, u64 *data)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
 extern struct bus_type mdio_bus_type;