netdev - Re: [PATCH net 2/2] net/sched: act_ct: Set offload timeout when setting the offload bit

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Date:   Tue, 28 Jul 2020 11:42:49 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Roi Dayan <roid@...lanox.com>
Cc:     netdev@...r.kernel.org, pablo@...filter.org,
        Paul Blakey <paulb@...lanox.com>, Oz Shlomo <ozsh@...lanox.com>
Subject: Re: [PATCH net 2/2] net/sched: act_ct: Set offload timeout when
 setting the offload bit

On Tue, Jul 28, 2020 at 02:57:59PM +0300, Roi Dayan wrote:
> On heavily loaded systems the GC can take time to go over all existing
> conns and reset their timeout. At that time other calls like from
> nf_conntrack_in() can call of nf_ct_is_expired() and see the conn as
> expired. To fix this when we set the offload bit we should also reset
> the timeout instead of counting on GC to finish first iteration over
> all conns before the initial timeout.
> 
> Fixes: 64ff70b80fd4 ("net/sched: act_ct: Offload established connections to flow table")
> Signed-off-by: Roi Dayan <roid@...lanox.com>
> Reviewed-by: Oz Shlomo <ozsh@...lanox.com>
> ---
>  net/sched/act_ct.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
> index e9f3576cbf71..650c2d78a346 100644
> --- a/net/sched/act_ct.c
> +++ b/net/sched/act_ct.c
> @@ -366,6 +366,8 @@ static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,

Extra context line:
	err = flow_offload_add(&ct_ft->nf_ft, entry);
>  	if (err)
>  		goto err_add;
>  
> +	nf_ct_offload_timeout(ct);
> +

What about adding this to flow_offload_add() instead?
It is already adjusting the flow_offload timeout there and then it
also effective for nft.

>  	return;
>  
>  err_add:
> -- 
> 2.8.4
>