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

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Date:   Wed, 29 Jul 2020 15:55:53 +0300
From:   Roi Dayan <roid@...lanox.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.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 2020-07-28 5:42 PM, Marcelo Ricardo Leitner wrote:
> 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.
> 

As you said, in flow_offload_add() we adjust the flow timeout.
Here we adjust the conn timeout.
So it's outside flow_offload_add() which only touch the flow struct.
I guess it's like conn offload bit is set outside here and for nft.
What do you think?

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