net/sched: act_connmark: transition to percpu stats and rcu

The tc action act_connmark was using shared stats and taking the per
action lock in the datapath. Improve it by using percpu stats and rcu.

perf before:
- 13.55% tcf_connmark_act
   - 81.18% _raw_spin_lock
       80.46% native_queued_spin_lock_slowpath

perf after:
- 2.85% tcf_connmark_act

tdc results:
1..15
ok 1 2002 - Add valid connmark action with defaults
ok 2 56a5 - Add valid connmark action with control pass
ok 3 7c66 - Add valid connmark action with control drop
ok 4 a913 - Add valid connmark action with control pipe
ok 5 bdd8 - Add valid connmark action with control reclassify
ok 6 b8be - Add valid connmark action with control continue
ok 7 d8a6 - Add valid connmark action with control jump
ok 8 aae8 - Add valid connmark action with zone argument
ok 9 2f0b - Add valid connmark action with invalid zone argument
ok 10 9305 - Add connmark action with unsupported argument
ok 11 71ca - Add valid connmark action and replace it
ok 12 5f8f - Add valid connmark action with cookie
ok 13 c506 - Replace connmark with invalid goto chain control
ok 14 6571 - Delete connmark action with valid index
ok 15 3426 - Delete connmark action with invalid index

Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/net/tc_act/tc_connmark.h b/include/net/tc_act/tc_connmark.h
index 1f4cb477bb5d..e8dd77a96748 100644
--- a/include/net/tc_act/tc_connmark.h
+++ b/include/net/tc_act/tc_connmark.h
@@ -4,10 +4,15 @@
 
 #include <net/act_api.h>
 
-struct tcf_connmark_info {
-	struct tc_action common;
+struct tcf_connmark_parms {
 	struct net *net;
 	u16 zone;
+	struct rcu_head rcu;
+};
+
+struct tcf_connmark_info {
+	struct tc_action common;
+	struct tcf_connmark_parms __rcu *parms;
 };
 
 #define to_connmark(a) ((struct tcf_connmark_info *)a)