linux-kernel - Re: [PATCH net-next 2/3] net: dsa: make the FDB add function return void

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Date:	Wed, 06 Apr 2016 10:26:57 -0400
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Scott Feldman <sfeldma@...il.com>
Subject: Re: [PATCH net-next 2/3] net: dsa: make the FDB add function return void

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

>> >>  	mutex_lock(&ps->smi_mutex);
>> >> -	ret = _mv88e6xxx_port_fdb_load(ds, port, fdb->addr, fdb->vid, state);
>> >> +	if (_mv88e6xxx_port_fdb_load(ds, port, fdb->addr, fdb->vid, state))
>> >> +		netdev_warn(ds->ports[port], "cannot load address\n");
>> >
>> > In the SF2 driver you use pr_err, but here netdev_warn. We probably
>> > should be consistent if we error or warn. I would use netdev_error,
>> > since if this fails we probably have a real hardware problem.
>> 
>> I used pr_err in the SF2 driver to be consistent with the rest of the
>> code which only uses pr_err and pr_info.
>
> O.K, good.
>  
>> I was thinking about adding ds_err and ds_port_err to print errors for
>> ds->master_dev and ds->ports[port], but that might be overkill.
>
> I'm also trying to kill off the use of ds within the mv88e6xxx driver.
>
>> What do you think? Or local to the driver for the moment, like
>> mvsw_err maybe?
>
> I would keep it local. Also, for this sort of error, it does not need
> to differentiate on port. It is a hardware access error, something is
> wrong with the mdio bus/switch. So i would even put the message in the
> very low level reg_read/reg_write functions, and no where else.

OK, so I will keep a netdev_err() in _mv88e6xxx_port_fdb_add since I
don't like to ignore return values, and will send a future separate
patch to add such message in low level functions as you suggested, and
maybe voidify a few high level functions using them.

Thanks,
Vivien