netdev - Re: [PATCH net-next 3/3] net: dsa: mv88e6xxx: add MDB support

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Date:   Wed, 31 Aug 2016 20:33:54 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        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 3/3] net: dsa: mv88e6xxx: add MDB support

Hello.

On 08/31/2016 05:46 PM, Vivien Didelot wrote:

>>> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
>>> index 93abfff..812cb47 100644
>>> --- a/drivers/net/dsa/mv88e6xxx/chip.c
>>> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
>>> @@ -2240,6 +2240,15 @@ static int mv88e6xxx_port_db_dump_one(struct mv88e6xxx_chip *chip,
>>>  				fdb->ndm_state = NUD_NOARP;
>>>  			else
>>>  				fdb->ndm_state = NUD_REACHABLE;
>>> +		} else {
>>
>> Rather than else, i think it would be safer to do
>>
>> 		if (obj->id == SWITCHDEV_OBJ_ID_PORT_MDB) {
>>> +			struct switchdev_obj_port_mdb *mdb;
>>> +
>>> +			if (!is_multicast_ether_addr(addr.mac))
>>> +				continue;
>>> +
>>> +			mdb = SWITCHDEV_OBJ_PORT_MDB(obj);
>>> +			mdb->vid = vid;
>>> +			ether_addr_copy(mdb->addr, addr.mac);
>>>  		}
>>
>> It should not happen, but the day it does, we get very confused...
>
> Do you mean the something like this?
>
>     if (obj->id == SWITCHDEV_OBJ_ID_PORT_FDB) {
>         ...
>     } else if (obj->id == SWITCHDEV_OBJ_ID_PORT_MDB) {
>         ...
>     } else {
>         return -EOPNOTSUPP;
>     }
>
> I'm OK with that if you think it is better.

    Just code it as a *switch*, please. :-)

[...]

MBR, Sergei