netdev - Re: [PATCH net-next] net/sched: act_ct: enable stats for HW offloaded entries

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Date:   Fri, 27 Nov 2020 10:57:55 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        netdev@...r.kernel.org
Cc:     paulb@...dia.com, ozsh@...dia.com, ahleihel@...dia.com,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [PATCH net-next] net/sched: act_ct: enable stats for HW offloaded
 entries


On 11/27/2020 2:40 AM, Marcelo Ricardo Leitner wrote:
> By setting NF_FLOWTABLE_COUNTER. Otherwise, the updates added by
> commit ef803b3cf96a ("netfilter: flowtable: add counter support in HW
> offload") are not effective when using act_ct.
>
> While at it, now that we have the flag set, protect the call to
> nf_ct_acct_update() by commit beb97d3a3192 ("net/sched: act_ct: update
> nf_conn_acct for act_ct SW offload in flowtable") with the check on
> NF_FLOWTABLE_COUNTER, as also done on other places.
>
> Note that this shouldn't impact performance as these stats are only
> enabled when net.netfilter.nf_conntrack_acct is enabled.
>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> ---
>  net/sched/act_ct.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
> index aba3cd85f284f3e49add31fe65e3b791f2386fa1..bb1ef3b8e77fb6fd6a74b88a65322baea2dc1ed5 100644
> --- a/net/sched/act_ct.c
> +++ b/net/sched/act_ct.c
> @@ -296,7 +296,8 @@ static int tcf_ct_flow_table_get(struct tcf_ct_params *params)
>  		goto err_insert;
>  
>  	ct_ft->nf_ft.type = &flowtable_ct;
> -	ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD;
> +	ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
> +			      NF_FLOWTABLE_COUNTER;
>  	err = nf_flow_table_init(&ct_ft->nf_ft);
>  	if (err)
>  		goto err_init;
> @@ -540,7 +541,8 @@ static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
>  	flow_offload_refresh(nf_ft, flow);
>  	nf_conntrack_get(&ct->ct_general);
>  	nf_ct_set(skb, ct, ctinfo);
> -	nf_ct_acct_update(ct, dir, skb->len);
> +	if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
> +		nf_ct_acct_update(ct, dir, skb->len);
>  
>  	return true;
>  }


Acked-by: wenxu <wenxu@...oud.cn>


BR

wenxu