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 <davem@davemloft.net>

1 files changed, 79 insertions, 11 deletions

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 7acc1169d75e..2413beb995be 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -273,25 +273,38 @@ int dsa_port_vlan_del(struct dsa_port *dp,
 	return 0;
 }
 
-static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
+static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
 {
-	struct device_node *port_dn = dp->dn;
 	struct device_node *phy_dn;
-	struct dsa_switch *ds = dp->ds;
 	struct phy_device *phydev;
-	int port = dp->index;
-	int err = 0;
 
-	phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
+	phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
 	if (!phy_dn)
-		return 0;
+		return NULL;
 
 	phydev = of_phy_find_device(phy_dn);
 	if (!phydev) {
-		err = -EPROBE_DEFER;
-		goto err_put_of;
+		of_node_put(phy_dn);
+		return ERR_PTR(-EPROBE_DEFER);
 	}
 
+	return phydev;
+}
+
+static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
+{
+	struct dsa_switch *ds = dp->ds;
+	struct phy_device *phydev;
+	int port = dp->index;
+	int err = 0;
+
+	phydev = dsa_port_get_phy_device(dp);
+	if (!phydev)
+		return 0;
+
+	if (IS_ERR(phydev))
+		return PTR_ERR(phydev);
+
 	if (enable) {
 		err = genphy_config_init(phydev);
 		if (err < 0)
@@ -317,8 +330,6 @@ static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
 
 err_put_dev:
 	put_device(&phydev->mdio.dev);
-err_put_of:
-	of_node_put(phy_dn);
 	return err;
 }
 
@@ -372,3 +383,60 @@ void dsa_port_link_unregister_of(struct dsa_port *dp)
 	else
 		dsa_port_setup_phy_of(dp, false);
 }
+
+int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
+{
+	struct phy_device *phydev;
+	int ret = -EOPNOTSUPP;
+
+	if (of_phy_is_fixed_link(dp->dn))
+		return ret;
+
+	phydev = dsa_port_get_phy_device(dp);
+	if (IS_ERR_OR_NULL(phydev))
+		return ret;
+
+	ret = phy_ethtool_get_strings(phydev, data);
+	put_device(&phydev->mdio.dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
+
+int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
+{
+	struct phy_device *phydev;
+	int ret = -EOPNOTSUPP;
+
+	if (of_phy_is_fixed_link(dp->dn))
+		return ret;
+
+	phydev = dsa_port_get_phy_device(dp);
+	if (IS_ERR_OR_NULL(phydev))
+		return ret;
+
+	ret = phy_ethtool_get_stats(phydev, NULL, data);
+	put_device(&phydev->mdio.dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
+
+int dsa_port_get_phy_sset_count(struct dsa_port *dp)
+{
+	struct phy_device *phydev;
+	int ret = -EOPNOTSUPP;
+
+	if (of_phy_is_fixed_link(dp->dn))
+		return ret;
+
+	phydev = dsa_port_get_phy_device(dp);
+	if (IS_ERR_OR_NULL(phydev))
+		return ret;
+
+	ret = phy_ethtool_get_sset_count(phydev);
+	put_device(&phydev->mdio.dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);