netdev - Re: [PATCH net] bridge: multicast: restore perm router ports on multicast enable

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Date:   Tue, 18 Oct 2016 16:16:45 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     herbert@...dor.apana.org.au, roopa@...ulusnetworks.com,
        stephen@...workplumber.org
Subject: Re: [PATCH net] bridge: multicast: restore perm router ports on
 multicast enable

On 18/10/16 15:10, Nikolay Aleksandrov wrote:
> Satish reported a problem with the perm multicast router ports not getting
> reenabled after some series of events, in particular if it happens that the
> multicast snooping has been disabled and the port goes to disabled state
> then it will be deleted from the router port list, but if it moves into
> non-disabled state it will not be re-added because the mcast snooping is
> still disabled, and enabling snooping later does nothing.
> 
> Here are the steps to reproduce, setup br0 with snooping enabled and eth1
> added as a perm router (multicast_router = 2):
> 1. $ echo 0 > /sys/class/net/br0/bridge/multicast_snooping
> 2. $ ip l set eth1 down
> ^ This step deletes the interface from the router list
> 3. $ ip l set eth1 up
> ^ This step does not add it again because mcast snooping is disabled
> 4. $ echo 1 > /sys/class/net/br0/bridge/multicast_snooping
> 5. $ bridge -d -s mdb show
> <empty>
> 
> At this point we have mcast enabled and eth1 as a perm router (value = 2)
> but it is not in the router list which is incorrect.
> 
> After this change:
> 1. $ echo 0 > /sys/class/net/br0/bridge/multicast_snooping
> 2. $ ip l set eth1 down
> ^ This step deletes the interface from the router list
> 3. $ ip l set eth1 up
> ^ This step does not add it again because mcast snooping is disabled
> 4. $ echo 1 > /sys/class/net/br0/bridge/multicast_snooping
> 5. $ bridge -d -s mdb show
> router ports on br0: eth1
> 
> Fixes: 561f1103a2b7 ("bridge: Add multicast_snooping sysfs toggle")
> Reported-by: Satish Ashok <sashok@...ulusnetworks.com>
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> ---
>  net/bridge/br_multicast.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 

Self-NAK. I sent an older version of the patch, v2 coming up.
Sorry for the noise.