[PATCH net-next v2 1/2] net/sched: act_csum: use per-core statistics

[Davide Caratti]

use per-CPU counters, like other TC actions do, instead of maintaining one
set of stats across all cores. This allows updating act_csum stats without
the need of protecting them using spin_{,un}lock_bh() invocations.

Signed-off-by: Davide Caratti <dcara...@redhat.com>
---
 net/sched/act_csum.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index af4b8ec60d9a..df22da365cd9 100644
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -67,7 +67,7 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
 
        if (!tcf_idr_check(tn, parm->index, a, bind)) {
                ret = tcf_idr_create(tn, parm->index, est, a,
-                                    &act_csum_ops, bind, false);
+                                    &act_csum_ops, bind, true);
                if (ret)
                        return ret;
                ret = ACT_P_CREATED;
@@ -542,9 +542,9 @@ static int tcf_csum(struct sk_buff *skb, const struct 
tc_action *a,
        int action;
        u32 update_flags;
 
-       spin_lock(&p->tcf_lock);
        tcf_lastuse_update(&p->tcf_tm);
-       bstats_update(&p->tcf_bstats, skb);
+       bstats_cpu_update(this_cpu_ptr(p->common.cpu_bstats), skb);
+       spin_lock(&p->tcf_lock);
        action = p->tcf_action;
        update_flags = p->update_flags;
        spin_unlock(&p->tcf_lock);
@@ -566,9 +566,7 @@ static int tcf_csum(struct sk_buff *skb, const struct 
tc_action *a,
        return action;
 
 drop:
-       spin_lock(&p->tcf_lock);
-       p->tcf_qstats.drops++;
-       spin_unlock(&p->tcf_lock);
+       qstats_drop_inc(this_cpu_ptr(p->common.cpu_qstats));
        return TC_ACT_SHOT;
 }
 
-- 
2.13.6