netdev - Re: [PATCH net-next v3 1/2] ipv6: start fib6 gc on RTF

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Date:   Thu, 19 Oct 2017 14:01:47 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Paolo Abeni <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        Wei Wang <weiwan@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next v3 1/2] ipv6: start fib6 gc on RTF_CACHE dst
 creation

On Thu, Oct 19, 2017 at 02:07:10PM +0000, Paolo Abeni wrote:
> After the commit 2b760fcf5cfb ("ipv6: hook up exception table
> to store dst cache"), the fib6 gc is not started after the
> creation of a RTF_CACHE via a redirect or pmtu update, since
> fib6_add() isn't invoked anymore for such dsts.
> 
> We need the fib6 gc to run periodically to clean the RTF_CACHE,
> or the dst will stay there forever.
> 
> Fix it by explicitly calling fib6_force_start_gc() on successful
> exception creation. gc_args->more accounting will ensure that
> the gc timer will run for whatever time needed to properly
> clean the table.
> 
> v2 -> v3:
>  - clarified the commit message
> 
> Fixes: 2b760fcf5cfb ("ipv6: hook up exception table to store dst cache")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Acked-by: Martin KaFai Lau <kafai@...com>