linux-kernel - Re: [PATCH 11/14] net: dsa: Add support for reading switch registers with ethtool

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Date:	Wed, 22 Oct 2014 21:40:14 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/14] net: dsa: Add support for reading switch registers
 with ethtool

2014-10-22 21:03 GMT-07:00 Guenter Roeck <linux@...ck-us.net>:
> Add support for reading switch registers with 'ethtool -d'.
>
> Signed-off-by: Guenter Roeck <linux@...ck-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
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