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

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Message-ID: <CA+CtxLR-mWy_R7P-YqQwT+R20dBr-8OicvTji5-vbtFa1vzarg@mail.gmail.com>
Date:	Mon, 16 Mar 2015 13:29:16 +0530
From:	Siva Mannem <siva.mannem.lnx@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2] Configure bridge FDB ageing time using netlink.

On Mon, Mar 16, 2015 at 7:43 AM, David Miller <davem@...emloft.net> wrote:
> From: Siva Mannem <siva.mannem.lnx@...il.com>
> Date: Sat, 14 Mar 2015 07:10:29 +0530
>
>> 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>
>
> The behavior of br_changelink() leaves a lot to be desired, and this
> change is making it worse.
>
> The range of the netlink attributes, the only thing that can cause
> an error, should be validated for all attributes _first_.
>
I will check whether this can be achieved by adding the required range checks
to br_validate(). Any side-effects with this approach?

> Because right now you can have several values change state,
> then the last one has a range error, and an error is returned
> without rolling back the state.
>

> This is terrible.
>
> When this happens the user has not reliable way to figure out
> that some of the state changes it requested happened, and
> exactly which ones those were.
>
> If an error is thrown we _MUST_ not make any state changes to
> the bridge whatsoever.



-- 
Regards,
Siva Mannem.
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