netdev - Re: [PATCH RFC WIP 0/5] IGMP snooping for local traffic

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Date:   Sun, 27 Aug 2017 01:02:30 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>, jiri@...lanox.com,
        roopa@...ulusnetworks.com, stephen@...workplumber.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH RFC WIP 0/5] IGMP snooping for local traffic

> Hi Andrew,
> 
> Have you taken a look at mglist (the boolean, probably needs a rename) ? It is for
> exactly that purpose, to track which groups the bridge is interested in.
> I assume I'm forgetting or missing something here.
> 
> > performed. With a pure software bridge, it is not required. All
> > mulitcast frames are passed to the brX interface, and the network
> 
> If mglist (again the boolean) is false then they won't be passed up.
> 
> > stack filters them, as it does for any interface. However, when
> > hardware offload is involved, things change. We should program the
> > hardware to only send multcast packets to the host when the host has
> > in interest in them.
> 
> Granted the boolean mglist might need some changes (esp. with host group leave)
> but I think it can be used to program switchdev for host join/leave, can't
> we adjust its behaviour instead of introducing this complexity and avoid many
> headaches ?

I would like to avoid this complexity as well. I will take a look at
mglist. Thanks for the hint.

	Andrew