netdev - Re: [patch net-next 6/8] ipv4: fib: Add an API to request a FIB dump

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Message-ID: <4f51c606-09ee-ff58-b25a-545a87a70fea@stressinduktion.org>
Date:   Wed, 16 Nov 2016 17:56:57 +0100
From:   Hannes Frederic Sowa <hannes@...essinduktion.org>
To:     David Miller <davem@...emloft.net>
Cc:     jiri@...nulli.us, netdev@...r.kernel.org, idosch@...lanox.com,
        eladr@...lanox.com, yotamg@...lanox.com, nogahf@...lanox.com,
        arkadis@...lanox.com, ogerlitz@...lanox.com,
        roopa@...ulusnetworks.com, dsa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, andy@...yhouse.net,
        vivien.didelot@...oirfairelinux.com, andrew@...n.ch,
        f.fainelli@...il.com, alexander.h.duyck@...el.com,
        kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net
Subject: Re: [patch net-next 6/8] ipv4: fib: Add an API to request a FIB dump

On 16.11.2016 17:27, David Miller wrote:
> From: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Date: Wed, 16 Nov 2016 15:51:01 +0100
> 
>> I don't see a way around doing a journal like in filesystems somehow,
> 
> We really just need a sequence counter incremented for each insert/remove,
> and restart the dump from the beginning if it changes mid-dump.

I thought about this at first, too, but became afraid if we could end up
looping endlessly because of routing changes happen constantly while
trying to upload the fib into the hardware.