linux-kernel - RE: Re: [PATCH net-next v2 6/9] net: phy: add backplane kr driver support

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Date:   Fri, 24 Apr 2020 14:39:54 +0000
From:   Florinel Iordache <florinel.iordache@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "corbet@....net" <corbet@....net>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Florinel Iordache <florinel.iordache@....com>
Subject: RE: Re: [PATCH net-next v2 6/9] net: phy: add backplane kr driver
 support

> > +/* Backplane custom logging */
> > +#define bpdev_fn(fn)                                                 \
> > +void bpdev_##fn(struct phy_device *phydev, char *fmt, ...)           \
> > +{                                                                    \
> > +     struct va_format vaf = {                                        \
> > +             .fmt = fmt,                                             \
> > +     };                                                              \
> > +     va_list args;                                                   \
> > +     va_start(args, fmt);                                            \
> > +     vaf.va = &args;                                                 \
> > +     if (!phydev->attached_dev)                                      \
> > +             dev_##fn(&phydev->mdio.dev, "%pV", &vaf);               \
> > +     else                                                            \
> > +             dev_##fn(&phydev->mdio.dev, "%s: %pV",                  \
> > +                     netdev_name(phydev->attached_dev), &vaf);       \
> > +     va_end(args);                                                   \
> > +}
> > +
> > +bpdev_fn(err)
> > +EXPORT_SYMBOL(bpdev_err);
> > +
> > +bpdev_fn(warn)
> > +EXPORT_SYMBOL(bpdev_warn);
> > +
> > +bpdev_fn(info)
> > +EXPORT_SYMBOL(bpdev_info);
> > +
> > +bpdev_fn(dbg)
> > +EXPORT_SYMBOL(bpdev_dbg);
> 
> Didn't i say something about just using phydev_{err|warn|info|dbg}?
> 
>        Andrew

Hi Andrew,

I used this custom logging in order to be able to add any kind of useful information we might need to all prints (err/warn/info/dbg).
For example all these bpdev_ functions are equivalent with phydev_ but only in the case when there is no attached device: phydev->attached_dev == NULL.
Otherwise, if there is a device attached, then we also want to add its name to all these prints in order to know to which device the information refers to.
For example in this case the print looks like this:
[   50.853515] backplane_qoriq 8c13000:00: eth1: 10gbase-kr link trained, Tx equalization: C(-1)=0x0, C(0)=0x29, C(+1)=0x5
This is very useful because we can see very easy to which interface the information printed is related to: in this case the link was trained for interface: eth1
This information (the name of attached device: eth1) is not printed by phydev_ functions.
I'm sorry I have not explained all this earlier, the first time when you asked about it. 

Florin.