netdev - Re: [PATCH 7/9] net: mvmdio: add xmdio support

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Message-ID: <20170607155636.GK4902@n2100.armlinux.org.uk>
Date:   Wed, 7 Jun 2017 16:56:36 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        davem@...emloft.net, jason@...edaemon.net, andrew@...n.ch,
        gregory.clement@...e-electrons.com,
        sebastian.hesselbarth@...il.com,
        thomas.petazzoni@...e-electrons.com, netdev@...r.kernel.org,
        mw@...ihalf.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 7/9] net: mvmdio: add xmdio support

On Wed, Jun 07, 2017 at 08:48:06AM -0700, Florian Fainelli wrote:
> On 06/07/2017 01:38 AM, Antoine Tenart wrote:
> > This patch adds the xMDIO interface support in the mvmdio driver. This
> > interface is used in Ethernet controllers on Marvell 370, 7k and 8k (as
> > of now). The xSMI interface supported by this driver complies with the
> > IEEE 802.3 clause 45 (while the SMI interface complies with the clause
> > 22). The xSMI interface is used by 10GbE devices.
> > 
> > Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> > ---
> 
> > +	if (of_device_is_compatible(np, "marvell,orion-mdio")) {
> > +		ops->is_done = smi_is_done;
> > +		ops->is_read_valid = smi_is_read_valid;
> > +		ops->start_read = smi_start_read_op;
> > +		ops->read = smi_read_op;
> > +		ops->write = smi_write_op;
> > +
> > +		dev->poll_interval_min = MVMDIO_SMI_POLL_INTERVAL_MIN;
> > +		dev->poll_interval_max = MVMDIO_SMI_POLL_INTERVAL_MAX;
> > +	} else if (of_device_is_compatible(np, "marvell,xmdio")) {
> > +		ops->is_done = xsmi_is_done;
> > +		ops->is_read_valid = xsmi_is_read_valid;
> > +		ops->start_read = xsmi_start_read_op;
> > +		ops->read = xsmi_read_op;
> > +		ops->write = xsmi_write_op;
> > +
> > +		dev->poll_interval_min = MVMDIO_XSMI_POLL_INTERVAL_MIN;
> > +		dev->poll_interval_max = MVMDIO_XSMI_POLL_INTERVAL_MAX;
> > +	} else {
> > +		return -EINVAL;
> > +	}
> 
> Instead of doing this, you could have the ops structure declared e.g: a
> static global variables in the driver and reference them from the
> of_device_id .data field, something like:
> 
> static struct orion_mdio_ops mdio_ops = {
> 	...
> };

In this case, don't forget the "const" for static structures containing
only function pointers (so that the function pointers can't be exploited.)

-- 
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