netdev - Re: [PATCH v2 net-next 8/8] net: dsa: mv88e6xxx: Offload bridge broadcast flooding flag

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Date:   Thu, 18 Mar 2021 09:14:07 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
        vivien.didelot@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 8/8] net: dsa: mv88e6xxx: Offload bridge
 broadcast flooding flag



On 3/18/2021 7:35 AM, Vladimir Oltean wrote:
> On Thu, Mar 18, 2021 at 03:15:50PM +0100, Tobias Waldekranz wrote:
>> These switches have two modes of classifying broadcast:
>>
>> 1. Broadcast is multicast.
>> 2. Broadcast is its own unique thing that is always flooded
>>    everywhere.
>>
>> This driver uses the first option, making sure to load the broadcast
>> address into all active databases. Because of this, we can support
>> per-port broadcast flooding by (1) making sure to only set the subset
>> of ports that have it enabled whenever joining a new bridge or VLAN,
>> and (2) by updating all active databases whenever the setting is
>> changed on a port.
>>
>> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
>> ---
>>  drivers/net/dsa/mv88e6xxx/chip.c | 73 +++++++++++++++++++++++++++++++-
>>  1 file changed, 72 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
>> index 7976fb699086..3baa4dadb0dd 100644
>> --- a/drivers/net/dsa/mv88e6xxx/chip.c
>> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
>> @@ -1982,6 +1982,21 @@ static int mv88e6xxx_broadcast_setup(struct mv88e6xxx_chip *chip, u16 vid)
>>  	int err;
>>  
>>  	for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
>> +		struct dsa_port *dp = dsa_to_port(chip->ds, port);
>> +		struct net_device *brport;
>> +
>> +		if (dsa_is_unused_port(chip->ds, port))
>> +			continue;
>> +
>> +		brport = dsa_port_to_bridge_port(dp);
>> +
>> +		if (dp->bridge_dev &&
>> +		    !br_port_flag_is_set(brport, BR_BCAST_FLOOD))
> 
> I think I would have liked to see a dsa_port_to_bridge_port helper that
> actually returns NULL when dp->bridge_dev is NULL.
> 
> This would make your piece of code look as follows:
> 
> 		brport = dsa_port_to_bridge_port(dp);
> 		if (brport && !br_port_flag_is_set(brport, BR_BCAST_FLOOD)
> 			continue;

Agreed, with that fixed:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian