net: dsa: better error reporting

Add additional error reporting to the generic DSA code, so it's easier
to debug when things go wrong.  This was useful when initially bringing
up 88e6176 on a new board.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index c59fa5d..aa398bc 100644 (file)
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -326,8 +326,8 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 
                ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
                if (ret < 0) {
-                       netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
-                                  index, i, pd->port_names[i]);
+                       netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
+                                  index, i, pd->port_names[i], ret);
                        ret = 0;
                }
        }

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 5f65f92..4f607bc 100644 (file)
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1026,8 +1026,10 @@ static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
        struct dsa_switch *ds = p->parent;
 
        p->phy = ds->slave_mii_bus->phy_map[addr];
-       if (!p->phy)
+       if (!p->phy) {
+               netdev_err(slave_dev, "no phy at %d\n", addr);
                return -ENODEV;
+       }
 
        /* Use already configured phy mode */
        if (p->phy_interface == PHY_INTERFACE_MODE_NA)
@@ -1061,7 +1063,7 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                 */
                ret = of_phy_register_fixed_link(port_dn);
                if (ret) {
-                       netdev_err(slave_dev, "failed to register fixed PHY\n");
+                       netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
                        return ret;
                }
                phy_is_fixed = true;
@@ -1072,17 +1074,20 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                phy_flags = ds->drv->get_phy_flags(ds, p->port);
 
        if (phy_dn) {
-               ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
+               int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
+
                /* If this PHY address is part of phys_mii_mask, which means
                 * that we need to divert reads and writes to/from it, then we
                 * want to bind this device using the slave MII bus created by
                 * DSA to make that happen.
                 */
-               if (!phy_is_fixed && ret >= 0 &&
-                   (ds->phys_mii_mask & (1 << ret))) {
-                       ret = dsa_slave_phy_connect(p, slave_dev, ret);
-                       if (ret)
+               if (!phy_is_fixed && phy_id >= 0 &&
+                   (ds->phys_mii_mask & (1 << phy_id))) {
+                       ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
+                       if (ret) {
+                               netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
                                return ret;
+                       }
                } else {
                        p->phy = of_phy_connect(slave_dev, phy_dn,
                                                dsa_slave_adjust_link,
@@ -1099,8 +1104,10 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
         */
        if (!p->phy) {
                ret = dsa_slave_phy_connect(p, slave_dev, p->port);
-               if (ret)
+               if (ret) {
+                       netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
                        return ret;
+               }
        } else {
                netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
                            p->phy->addr, p->phy->drv->name);
@@ -1212,6 +1219,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 
        ret = dsa_slave_phy_setup(p, slave_dev);
        if (ret) {
+               netdev_err(master, "error %d setting up slave phy\n", ret);
                free_netdev(slave_dev);
                return ret;
        }