netdev - Re: [patch net-next 3/6] net: bridge: Export bridge multicast router state

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Message-ID: <7e4f99be-647f-8ed6-8285-bb3cea8483eb@cumulusnetworks.com>
Date:   Thu, 5 Oct 2017 16:09:26 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, yotamg@...lanox.com, idosch@...lanox.com,
        nogahf@...lanox.com, mlxsw@...lanox.com, ivecera@...hat.com,
        andrew@...n.ch, stephen@...workplumber.org, nbd@....name,
        roopa@...ulusnetworks.com
Subject: Re: [patch net-next 3/6] net: bridge: Export bridge multicast router
 state

On 05/10/17 13:36, Jiri Pirko wrote:
> From: Yotam Gigi <yotamg@...lanox.com>
> 
> Add an access function that, given a bridge netdevice, returns whether the
> bridge device is currently an mrouter or not. The function uses the already
> existing br_multicast_is_router function to check that.
> 
> This function is needed in order to allow ports that join an already
> existing bridge to know the current mrouter state of the bridge device.
> Together with the bridge device mrouter ports switchdev notifications, it
> is possible to have full offloading of the semantics of the bridge device
> mcast router state.
> 
> Due to the fact that the bridge multicast router status can change in
> packet RX path, take the multicast_router bridge spinlock to protect the
> read.
> 
> Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
> Reviewed-by: Nogah Frankel <nogahf@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/if_bridge.h |  5 +++++
>  net/bridge/br_multicast.c | 12 ++++++++++++
>  2 files changed, 17 insertions(+)
> 

Reviewed-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>