netdev - Re: [PATCH net-next 6/6] net: dsa: mv88e6xxx: Flood broadcast frames in hardware

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Message-ID: <465be6d8-67d0-d176-1252-abb222bf0528@gmail.com>
Date:   Wed, 27 Sep 2017 12:33:29 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 6/6] net: dsa: mv88e6xxx: Flood broadcast frames
 in hardware

On 09/27/2017 12:19 PM, Vivien Didelot wrote:
> Hi Andrew, Florian,
> 
> Andrew Lunn <andrew@...n.ch> writes:
> 
>> It took me a while to make this work with CONFIG_BRIDGE_VLAN_FILTERING
>> enabled. Any change to enable hardware flooding needs careful testing
>> for lots of different configurations. This is another reason i don't
>> want to do it at the DSA level, until we have a good understanding
>> what it means in each individual driver.
> 
> Then if we are worried about how broadcast flooding is handled on
> different switches, we can provide a new .flood_broadcast(ds, vid)
> switch operation for the drivers to implement.

We don't really have a good visibility on the number of switches
requiring special configuration for broadcast addresses nor how this
would have to happen so it would be a tad difficult to define an
appropriate API with a single user.

In general, single user "generic" facilities tend to be biased towards
their particular problem space (c.f: devlink) so a generic interface to
call into HW specific details does not usually sell well...
-- 
Florian