netdev - Re: [RFC PATCH] bridge: inherit slave devices needed

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Date:	Fri, 23 Aug 2013 10:49:48 +0800
From:	Amos Kong <kongjianjun@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	eric.dumazet@...il.com, Vlad Yasevich <vyasevic@...hat.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH] bridge: inherit slave devices needed_headroom

On Tue, Aug 20, 2013 at 5:21 PM, Florian Fainelli <f.fainelli@...il.com> wrote:
> Some slave devices may have set a dev->needed_headroom value which is
> different than the default one, most likely in order to prepend a
> hardware descriptor in front of the Ethernet frame to send. Whenever a
> new slave is added to a bridge, ensure that we update the
> needed_headroom value accordingly to account for the slave
> needed_headroom value.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  net/bridge/br_if.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
> index aa6c9a8..c41d5fb 100644
> --- a/net/bridge/br_if.c
> +++ b/net/bridge/br_if.c
> @@ -383,6 +383,9 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
>
>         netdev_update_features(br->dev);
>
> +       if (br->dev->needed_headroom < dev->needed_headroom)
> +               br->dev->needed_headroom = dev->needed_headroom;
> +

do we need to update 'br->dev->needed_headroom' in br_del_if()?

if (br->dev->needed_headroom == dev->needed_headroom)
    br->dev->needed_headroom = ....;


>         spin_lock_bh(&br->lock);
>         changed_addr = br_stp_recalculate_bridge_id(br);
>
> --
> 1.8.1.2
>
>
> --
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