pkt_sched: gen_estimator: Optimize gen_estimator_active()

Since all other gen_estimator functions use bstats and rate_est params
together, and searching for them is optimized now, let's use this also
in gen_estimator_active(). The return type of gen_estimator_active()
is changed to bool, and gen_find_node() parameters to const, btw.

In tcf_act_police_locate() a check for ACT_P_CREATED is added before
calling gen_estimator_active().

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/gen_stats.h

@@ -45,6 +45,6 @@ extern void gen_kill_estimator(struct gnet_stats_basic *bstats,
 extern int gen_replace_estimator(struct gnet_stats_basic *bstats,
 				 struct gnet_stats_rate_est *rate_est,
 				 spinlock_t *stats_lock, struct nlattr *opt);
-extern int gen_estimator_active(const struct gnet_stats_rate_est *rate_est);
-
+extern bool gen_estimator_active(const struct gnet_stats_basic *bstats,
+				 const struct gnet_stats_rate_est *rate_est);
 #endif

net/core/gen_estimator.c

@@ -163,8 +163,9 @@ static void gen_add_node(struct gen_estimator *est)
 	rb_insert_color(&est->node, &est_root);
 }
 
-static struct gen_estimator *gen_find_node(struct gnet_stats_basic *bstats,
-					   struct gnet_stats_rate_est *rate_est)
+static
+struct gen_estimator *gen_find_node(const struct gnet_stats_basic *bstats,
+				    const struct gnet_stats_rate_est *rate_est)
 {
 	struct rb_node *p = est_root.rb_node;
 
@@ -301,26 +302,16 @@ EXPORT_SYMBOL(gen_replace_estimator);
 
 /**
  * gen_estimator_active - test if estimator is currently in use
+ * @bstats: basic statistics
  * @rate_est: rate estimator statistics
  *
- * Returns 1 if estimator is active, and 0 if not.
+ * Returns true if estimator is active, and false if not.
  */
-int gen_estimator_active(const struct gnet_stats_rate_est *rate_est)
+bool gen_estimator_active(const struct gnet_stats_basic *bstats,
+			  const struct gnet_stats_rate_est *rate_est)
 {
-	int idx;
-	struct gen_estimator *e;
-
 	ASSERT_RTNL();
 
-	for (idx=0; idx <= EST_MAX_INTERVAL; idx++) {
-		if (!elist[idx].timer.function)
-			continue;
-
-		list_for_each_entry(e, &elist[idx].list, list) {
-			if (e->rate_est == rate_est)
-				return 1;
-		}
-	}
-	return 0;
+	return gen_find_node(bstats, rate_est) != NULL;
 }
 EXPORT_SYMBOL(gen_estimator_active);

net/sched/act_police.c

@@ -183,7 +183,9 @@ static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est,
 		if (R_tab == NULL)
 			goto failure;
 
-		if (!est && !gen_estimator_active(&police->tcf_rate_est)) {
+		if (!est && (ret == ACT_P_CREATED ||
+			     !gen_estimator_active(&police->tcf_bstats,
+						   &police->tcf_rate_est))) {
 			err = -EINVAL;
 			goto failure;
 		}