linux-kernel - Re: [PATCH net-next 08/18] net: dsa: mv88e6xxx: move generic VTU GetNext

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Date:   Fri, 28 Apr 2017 11:07:08 -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>
Subject: Re: [PATCH net-next 08/18] net: dsa: mv88e6xxx: move generic VTU GetNext

Hi Andrew,

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

>> +	/* Write the VID to iterate from only once */
>> +	if (!entry->valid) {
>> +		err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
>> +		if (err)
>> +			return err;
>> +	}
>
> Please could you add a bigger comment. It is not clear why you write
> it, when it is invalid. That just seems wrong, and needs a good
> comment to explain why it is correct, more than what you currently
> have as a comment.

This trick could indeed benefit a better explanation. The reason for it
is that I used the same comment as the ATU GetNext implementation, i.e.:

    /* Write the MAC address to iterate from only once */
    if (entry->state == GLOBAL_ATU_DATA_STATE_UNUSED) {
        err = mv88e6xxx_g1_atu_mac_write(chip, entry);
        if (err)
            return err;
    }

I suggest me sending a future patch to improve the comments of both
GetNext (ATU and VTU) implementations at the same time later.

Thanks,

        Vivien