netdev - Re: [PATCH v4 13/14] net: phy: adin: add ethtool get

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Date:   Tue, 13 Aug 2019 05:48:53 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "andrew@...n.ch" <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH v4 13/14] net: phy: adin: add ethtool get_stats support

On Mon, 2019-08-12 at 16:33 +0200, Andrew Lunn wrote:
> [External]
> 
> > +static int adin_read_mmd_stat_regs(struct phy_device *phydev,
> > +				   struct adin_hw_stat *stat,
> > +				   u32 *val)
> > +{
> > +	int ret;
> > +
> > +	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg1);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*val = (ret & 0xffff);
> > +
> > +	if (stat->reg2 == 0)
> > +		return 0;
> > +
> > +	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg2);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*val <<= 16;
> > +	*val |= (ret & 0xffff);
> > +
> > +	return 0;
> > +}
> 
> It still looks like you have not dealt with overflow from the LSB into
> the MSB between the two reads.

Apologies for forgetting to address this.
I did not intentionally leave it out; this item got lost after V1 [which had the most remarks].
Changelog V1 -> V2 was quite bulky, and I did not look at V1 remarks after I finished V2.

Thanks for snippet.

> 
> 	do {
> 		hi1 = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg2);
> 		if (hi1 < 0)
> 			return hi1;
> 		
> 		low = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg1);
> 		if (low < 0)
> 			return low;
> 
> 		hi2 = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg2);
> 		if (hi2 < 0)
> 			return hi1;
> 	} while (hi1 != hi2)
> 
> 	return low | (hi << 16);
> 
> 	Andrew