2014-10-22 21:03 GMT-07:00 Guenter Roeck [off-list ref]:

Add support for reading switch registers with 'ethtool -d'.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---

[snip]

+static int dsa_slave_get_regs_len(struct net_device *dev)
+{
+       struct dsa_slave_priv *p = netdev_priv(dev);
+       struct dsa_switch *ds = p->parent;
+
+       if (ds->drv->get_regs_len != NULL)
+               return ds->drv->get_regs_len(ds, p->port);

Most of the checks in this file are just:

if (ds->drv->callback)
     return ds->drv->callback(...)

+
+       return -EOPNOTSUPP;
+}
+
+static void
+dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
+{
+       struct dsa_slave_priv *p = netdev_priv(dev);
+       struct dsa_switch *ds = p->parent;
+
+       ds->drv->get_regs(ds, p->port, regs, _p);

We need to check that the driver does implement this callback here as well.
-- 
Florian