netdev - Re: [PATCH net-next v4 10/15] net: bridge: mcast: support for IGMPv3/MLDv2 ALLOW_NEW

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Date:   Fri, 15 Oct 2021 14:36:59 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, roopa@...dia.com,
        bridge@...ts.linux-foundation.org, kuba@...nel.org,
        davem@...emloft.net
Subject: Re: [PATCH net-next v4 10/15] net: bridge: mcast: support for
 IGMPv3/MLDv2 ALLOW_NEW_SOURCES report

On Fri, Oct 15, 2021 at 10:52:00AM +0800, Hangbin Liu wrote:
> > -	mod_timer(&p->timer, now + br->multicast_membership_interval);
> > +	if (igmpv2_mldv1)
> > +		mod_timer(&p->timer, now + br->multicast_membership_interval);
> 
> Hi Nikolay,
> 
> Our engineer found that the multicast_membership_interval will not work with
> IGMPv3. Is it intend as you said "IGMPv3/MLDv2 handling is not yet
> implemented" ?

Ah, I saw in br_multicast_group_expired() it wait for mp->ports be freed
before delete the mdb entry.

And in br_multicast_port_group_expired() it wait for src entry freed first.

But when mod group src timer, we use
__grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));

instead of user configured multicast_membership_interval. I think we should
fix it. WDYT?

Thanks
Hangbin