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-rw-r--r--net/core/gen_estimator.c97
1 files changed, 74 insertions, 23 deletions
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 57abe8266be..9cc9f95b109 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -31,6 +31,7 @@
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
+#include <linux/rbtree.h>
#include <net/sock.h>
#include <net/gen_stats.h>
@@ -89,6 +90,7 @@ struct gen_estimator
u32 avpps;
u32 avbps;
struct rcu_head e_rcu;
+ struct rb_node node;
};
struct gen_estimator_head
@@ -102,6 +104,9 @@ static struct gen_estimator_head elist[EST_MAX_INTERVAL+1];
/* Protects against NULL dereference */
static DEFINE_RWLOCK(est_lock);
+/* Protects against soft lockup during large deletion */
+static struct rb_root est_root = RB_ROOT;
+
static void est_timer(unsigned long arg)
{
int idx = (int)arg;
@@ -139,6 +144,46 @@ skip:
rcu_read_unlock();
}
+static void gen_add_node(struct gen_estimator *est)
+{
+ struct rb_node **p = &est_root.rb_node, *parent = NULL;
+
+ while (*p) {
+ struct gen_estimator *e;
+
+ parent = *p;
+ e = rb_entry(parent, struct gen_estimator, node);
+
+ if (est->bstats > e->bstats)
+ p = &parent->rb_right;
+ else
+ p = &parent->rb_left;
+ }
+ rb_link_node(&est->node, parent, p);
+ rb_insert_color(&est->node, &est_root);
+}
+
+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;
+
+ while (p) {
+ struct gen_estimator *e;
+
+ e = rb_entry(p, struct gen_estimator, node);
+
+ if (bstats > e->bstats)
+ p = p->rb_right;
+ else if (bstats < e->bstats || rate_est != e->rate_est)
+ p = p->rb_left;
+ else
+ return e;
+ }
+ return NULL;
+}
+
/**
* gen_new_estimator - create a new rate estimator
* @bstats: basic statistics
@@ -194,8 +239,11 @@ int gen_new_estimator(struct gnet_stats_basic *bstats,
mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx));
list_add_rcu(&est->list, &elist[idx].list);
+ gen_add_node(est);
+
return 0;
}
+EXPORT_SYMBOL(gen_new_estimator);
static void __gen_kill_estimator(struct rcu_head *head)
{
@@ -209,36 +257,27 @@ static void __gen_kill_estimator(struct rcu_head *head)
* @bstats: basic statistics
* @rate_est: rate estimator statistics
*
- * Removes the rate estimator specified by &bstats and &rate_est
- * and deletes the timer.
+ * Removes the rate estimator specified by &bstats and &rate_est.
*
* NOTE: Called under rtnl_mutex
*/
void gen_kill_estimator(struct gnet_stats_basic *bstats,
- struct gnet_stats_rate_est *rate_est)
+ struct gnet_stats_rate_est *rate_est)
{
- int idx;
- struct gen_estimator *e, *n;
-
- for (idx=0; idx <= EST_MAX_INTERVAL; idx++) {
-
- /* Skip non initialized indexes */
- if (!elist[idx].timer.function)
- continue;
+ struct gen_estimator *e;
- list_for_each_entry_safe(e, n, &elist[idx].list, list) {
- if (e->rate_est != rate_est || e->bstats != bstats)
- continue;
+ while ((e = gen_find_node(bstats, rate_est))) {
+ rb_erase(&e->node, &est_root);
- write_lock_bh(&est_lock);
- e->bstats = NULL;
- write_unlock_bh(&est_lock);
+ write_lock_bh(&est_lock);
+ e->bstats = NULL;
+ write_unlock_bh(&est_lock);
- list_del_rcu(&e->list);
- call_rcu(&e->e_rcu, __gen_kill_estimator);
- }
+ list_del_rcu(&e->list);
+ call_rcu(&e->e_rcu, __gen_kill_estimator);
}
}
+EXPORT_SYMBOL(gen_kill_estimator);
/**
* gen_replace_estimator - replace rate estimator configuration
@@ -259,8 +298,20 @@ int gen_replace_estimator(struct gnet_stats_basic *bstats,
gen_kill_estimator(bstats, rate_est);
return gen_new_estimator(bstats, rate_est, stats_lock, opt);
}
+EXPORT_SYMBOL(gen_replace_estimator);
+/**
+ * gen_estimator_active - test if estimator is currently in use
+ * @bstats: basic statistics
+ * @rate_est: rate estimator statistics
+ *
+ * Returns true if estimator is active, and false if not.
+ */
+bool gen_estimator_active(const struct gnet_stats_basic *bstats,
+ const struct gnet_stats_rate_est *rate_est)
+{
+ ASSERT_RTNL();
-EXPORT_SYMBOL(gen_kill_estimator);
-EXPORT_SYMBOL(gen_new_estimator);
-EXPORT_SYMBOL(gen_replace_estimator);
+ return gen_find_node(bstats, rate_est) != NULL;
+}
+EXPORT_SYMBOL(gen_estimator_active);