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

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Date:   Wed, 27 Sep 2017 22:18:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        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 Wed, Sep 27, 2017 at 12:33:29PM -0700, Florian Fainelli wrote:
> 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.

Yes, i agree with this. We should wait before adding a generic
solution. I want to wait until a few drivers do whatever is needed for
hardware broadcast. We can then see what is common, and what is
different, find an API to suit and do some refactoring.

	   Andrew