netdev - Re: [PATCH net-next 2/5] net: dsa: mv88e6xxx: Remove some bureaucracy around querying the VTU

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Date:   Wed, 17 Mar 2021 10:46:07 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/5] net: dsa: mv88e6xxx: Remove some bureaucracy around querying the VTU

On Tue, Mar 16, 2021 at 11:17, Vladimir Oltean <olteanv@...il.com> wrote:
> On Mon, Mar 15, 2021 at 10:13:57PM +0100, Tobias Waldekranz wrote:
>> +static int mv88e6xxx_vtu_get(struct mv88e6xxx_chip *chip, u16 vid,
>> +			     struct mv88e6xxx_vtu_entry *entry)
>>  {
>> +	int err;
>> +
>>  	if (!chip->info->ops->vtu_getnext)
>>  		return -EOPNOTSUPP;
>>  
>> -	return chip->info->ops->vtu_getnext(chip, entry);
>> +	entry->vid = vid - 1;
>
> Should the vtu_get API not work with vid 0 as well? Shouldn't we
> initialize entry->vid to mv88e6xxx_max_vid(chip) in that case?

Good catch. We never load VID 0 to the VTU today, but this function
should be ready for it, if that ever changes. Fixing in v2.

>> +	entry->valid = false;
>> +
>> +	err = chip->info->ops->vtu_getnext(chip, entry);
>> +
>> +	if (entry->vid != vid)
>> +		entry->valid = false;
>> +
>> +	return err;
>>  }