netdev - Re: [PATCH net-next v2] Configure bridge FDB ageing time using netlink.

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Message-ID: <CAE4R7bCAfrJDMZMEKhurd2axe0vpo+peZt7DdUMKwWhtwNaMnw@mail.gmail.com>
Date:	Sat, 14 Mar 2015 15:17:18 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Siva Mannem <siva.mannem.lnx@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2] Configure bridge FDB ageing time using netlink.

On Fri, Mar 13, 2015 at 6:40 PM, Siva Mannem <siva.mannem.lnx@...il.com> wrote:
> This patch allows user to configure bridge's FDB ageing using
> netlink(for ex, iproute2). Allowed range is 10 seconds to 1000000 seconds
> as per ieee8021QBridgeFdbAgingTime.
>
> Signed-off-by: Siva Mannem <siva.mannem.lnx@...il.com>
> ---
> Changes in v2:
>  - Added commit message.
>  - Fix style problems reported by checkpatch.pl.

> +
> +int br_set_ageing_time(struct net_bridge *br, unsigned long val)
> +{
> +       unsigned long t = clock_t_to_jiffies(val);
> +
> +       if (t < BR_MIN_AGEING_TIME || t > BR_MAX_AGEING_TIME)
> +               return -ERANGE;
> +
> +       spin_lock_bh(&br->lock);
> +       br->ageing_time = t;

I wonder if you need to call mod_timer(&br->gc_timer, jiffies) after
adjusting the time, to make new ageing_time effective?  The worst-case
scenario I'm thinking about is if the initial br->ageing_time is the
max value (1000000 seconds) and the user changes it the min value (10
seconds), will the original 1000000 seconds need to expire before the
gc_timer is called again and reset to 10 seconds?

> +       spin_unlock_bh(&br->lock);
> +       return 0;
> +}
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 8bc6b67..d80e802 100644
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