net: dsa: Allow providing PHY statistics from CPU port

Implement the same type of ethtool diversion that we have for
ETH_SS_STATS and make it work with ETH_SS_PHY_STATS. This allows
providing PHY level statistics for CPU ports that are directly
connecting to a PHY device.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 106 insertions, 5 deletions

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 0bc0aad1b02e..462e9741b210 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -361,6 +361,8 @@ struct dsa_switch_ops {
         void    (*get_ethtool_stats)(struct dsa_switch *ds,
                                      int port, uint64_t *data);
         int     (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
+        void    (*get_ethtool_phy_stats)(struct dsa_switch *ds,
+                                         int port, uint64_t *data);
 
         /*
          * ethtool Wake-on-LAN
@@ -589,4 +591,9 @@ static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 #define BRCM_TAG_GET_PORT(v)            ((v) >> 8)
 #define BRCM_TAG_GET_QUEUE(v)           ((v) & 0xff)
 
+
+int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
+int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
+int dsa_port_get_phy_sset_count(struct dsa_port *dp);
+
 #endif
diff --git a/net/dsa/master.c b/net/dsa/master.c
index 8d27687fd0ca..c90ee3227dea 100644
--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -31,6 +31,32 @@ static void dsa_master_get_ethtool_stats(struct net_device *dev,
                 ds->ops->get_ethtool_stats(ds, port, data + count);
 }
 
+static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
+                                             struct ethtool_stats *stats,
+                                             uint64_t *data)
+{
+        struct dsa_port *cpu_dp = dev->dsa_ptr;
+        const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
+        struct dsa_switch *ds = cpu_dp->ds;
+        int port = cpu_dp->index;
+        int count = 0;
+
+        if (dev->phydev && !ops->get_ethtool_phy_stats) {
+                count = phy_ethtool_get_sset_count(dev->phydev);
+                if (count >= 0)
+                        phy_ethtool_get_stats(dev->phydev, stats, data);
+        } else if (ops->get_sset_count && ops->get_ethtool_phy_stats) {
+                count = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
+                ops->get_ethtool_phy_stats(dev, stats, data);
+        }
+
+        if (count < 0)
+                count = 0;
+
+        if (ds->ops->get_ethtool_phy_stats)
+                ds->ops->get_ethtool_phy_stats(ds, port, data + count);
+}
+
 static int dsa_master_get_sset_count(struct net_device *dev, int sset)
 {
         struct dsa_port *cpu_dp = dev->dsa_ptr;
@@ -38,11 +64,14 @@ static int dsa_master_get_sset_count(struct net_device *dev, int sset)
         struct dsa_switch *ds = cpu_dp->ds;
         int count = 0;
 
-        if (ops->get_sset_count) {
+        if (sset == ETH_SS_PHY_STATS && dev->phydev &&
+            !ops->get_ethtool_phy_stats)
+                count = phy_ethtool_get_sset_count(dev->phydev);
+        else if (ops->get_sset_count)
                 count = ops->get_sset_count(dev, sset);
-                if (count < 0)
-                        count = 0;
-        }
+
+        if (count < 0)
+                count = 0;
 
         if (ds->ops->get_sset_count)
                 count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);
@@ -67,7 +96,14 @@ static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
         /* We do not want to be NULL-terminated, since this is a prefix */
         pfx[sizeof(pfx) - 1] = '_';
 
-        if (ops->get_sset_count && ops->get_strings) {
+        if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
+            !ops->get_ethtool_phy_stats) {
+                mcount = phy_ethtool_get_sset_count(dev->phydev);
+                if (mcount < 0)
+                        mcount = 0;
+                else
+                        phy_ethtool_get_strings(dev->phydev, data);
+        } else if (ops->get_sset_count && ops->get_strings) {
                 mcount = ops->get_sset_count(dev, stringset);
                 if (mcount < 0)
                         mcount = 0;
@@ -107,6 +143,7 @@ static int dsa_master_ethtool_setup(struct net_device *dev)
         ops->get_sset_count = dsa_master_get_sset_count;
         ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
         ops->get_strings = dsa_master_get_strings;
+        ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;
 
         dev->ethtool_ops = ops;
 
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 5e2a88720a9a..2413beb995be 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -383,3 +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);