netdev - Re: [PATCH net-next 1/2] net sched act_vlan: Change stats update to use per-core stats

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Date:   Wed, 11 Oct 2017 08:27:40 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Manish Kurup <kurup.manish@...il.com>, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, netdev@...r.kernel.org
Cc:     aring@...atatu.com, mrv@...atatu.com, manish.kurup@...izon.com
Subject: Re: [PATCH net-next 1/2] net sched act_vlan: Change stats update to
 use per-core stats

minus lk

On 17-10-10 10:32 PM, Manish Kurup wrote:
> The VLAN action maintains one set of stats across all cores, and uses a
> spinlock to synchronize updates to it from the same. Changed this to use a
> per-CPU stats context instead.
> This change will result in better performance.
> 
> Signed-off-by: Manish Kurup <manish.kurup@...izon.com>
> ---
>   net/sched/act_vlan.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
> index 16eb067..14c262c 100644
> --- a/net/sched/act_vlan.c
> +++ b/net/sched/act_vlan.c
> @@ -30,9 +30,10 @@ static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
>   	int err;
>   	u16 tci;
>   
> -	spin_lock(&v->tcf_lock);
>   	tcf_lastuse_update(&v->tcf_tm);
> -	bstats_update(&v->tcf_bstats, skb);
> +	bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
> +
> +	spin_lock(&v->tcf_lock);
>   	action = v->tcf_action;
>   
>   	/* Ensure 'data' points at mac_header prior calling vlan manipulating
> @@ -85,7 +86,8 @@ static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
>   
>   drop:
>   	action = TC_ACT_SHOT;
> -	v->tcf_qstats.drops++;
> +	qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
> +
>   unlock:
>   	if (skb_at_tc_ingress(skb))
>   		skb_pull_rcsum(skb, skb->mac_len);
> @@ -172,7 +174,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
>   
>   	if (!exists) {
>   		ret = tcf_idr_create(tn, parm->index, est, a,
> -				     &act_vlan_ops, bind, false);
> +						&act_vlan_ops, bind, true);
>

Indentation mismatch here?

Otherwise looks good to me.

Acked-by: Jamal Hadi Salim <jhs@...atatu.com>

cheers,
jamal