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

Jiri Pirko
2017-10-11T13:15:59Z

Wed, Oct 11, 2017 at 04:32:27AM CEST, kurup.manish@gmail.com 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@verizon.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);

Please fix this indent nit as pointed out by Jamal.

Feel free to add my tag:
Acked-by: Jiri Pirko <jiri@mellanox.com>

Thanks!