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Message-Id: <20180302025838.904-1-xiyou.wangcong@gmail.com>
Date: Thu, 1 Mar 2018 18:58:38 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: netfilter-devel@...r.kernel.org,
Cong Wang <xiyou.wangcong@...il.com>,
Florian Westphal <fw@...len.de>,
Eric Dumazet <edumazet@...gle.com>,
Pablo Neira Ayuso <pablo@...filter.org>
Subject: [Patch nf-next] netfilter: make xt_rateest hash table per net
As suggested by Eric, we need to make the xt_rateest
hash table and its lock per netns to reduce lock
contentions.
Cc: Florian Westphal <fw@...len.de>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
include/net/netfilter/xt_rateest.h | 4 +-
net/netfilter/xt_RATEEST.c | 91 +++++++++++++++++++++++++++-----------
net/netfilter/xt_rateest.c | 10 ++---
3 files changed, 72 insertions(+), 33 deletions(-)
diff --git a/include/net/netfilter/xt_rateest.h b/include/net/netfilter/xt_rateest.h
index b1db13772554..832ab69efda5 100644
--- a/include/net/netfilter/xt_rateest.h
+++ b/include/net/netfilter/xt_rateest.h
@@ -21,7 +21,7 @@ struct xt_rateest {
struct net_rate_estimator __rcu *rate_est;
};
-struct xt_rateest *xt_rateest_lookup(const char *name);
-void xt_rateest_put(struct xt_rateest *est);
+struct xt_rateest *xt_rateest_lookup(struct net *net, const char *name);
+void xt_rateest_put(struct net *net, struct xt_rateest *est);
#endif /* _XT_RATEEST_H */
diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c
index 141c295191f6..dec843cadf46 100644
--- a/net/netfilter/xt_RATEEST.c
+++ b/net/netfilter/xt_RATEEST.c
@@ -14,15 +14,21 @@
#include <linux/slab.h>
#include <net/gen_stats.h>
#include <net/netlink.h>
+#include <net/netns/generic.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_RATEEST.h>
#include <net/netfilter/xt_rateest.h>
-static DEFINE_MUTEX(xt_rateest_mutex);
-
#define RATEEST_HSIZE 16
-static struct hlist_head rateest_hash[RATEEST_HSIZE] __read_mostly;
+
+struct xt_rateest_net {
+ struct mutex hash_lock;
+ struct hlist_head hash[RATEEST_HSIZE];
+};
+
+static unsigned int xt_rateest_id;
+
static unsigned int jhash_rnd __read_mostly;
static unsigned int xt_rateest_hash(const char *name)
@@ -31,21 +37,23 @@ static unsigned int xt_rateest_hash(const char *name)
(RATEEST_HSIZE - 1);
}
-static void xt_rateest_hash_insert(struct xt_rateest *est)
+static void xt_rateest_hash_insert(struct xt_rateest_net *xn,
+ struct xt_rateest *est)
{
unsigned int h;
h = xt_rateest_hash(est->name);
- hlist_add_head(&est->list, &rateest_hash[h]);
+ hlist_add_head(&est->list, &xn->hash[h]);
}
-static struct xt_rateest *__xt_rateest_lookup(const char *name)
+static struct xt_rateest *__xt_rateest_lookup(struct xt_rateest_net *xn,
+ const char *name)
{
struct xt_rateest *est;
unsigned int h;
h = xt_rateest_hash(name);
- hlist_for_each_entry(est, &rateest_hash[h], list) {
+ hlist_for_each_entry(est, &xn->hash[h], list) {
if (strcmp(est->name, name) == 0) {
est->refcnt++;
return est;
@@ -55,20 +63,23 @@ static struct xt_rateest *__xt_rateest_lookup(const char *name)
return NULL;
}
-struct xt_rateest *xt_rateest_lookup(const char *name)
+struct xt_rateest *xt_rateest_lookup(struct net *net, const char *name)
{
+ struct xt_rateest_net *xn = net_generic(net, xt_rateest_id);
struct xt_rateest *est;
- mutex_lock(&xt_rateest_mutex);
- est = __xt_rateest_lookup(name);
- mutex_unlock(&xt_rateest_mutex);
+ mutex_lock(&xn->hash_lock);
+ est = __xt_rateest_lookup(xn, name);
+ mutex_unlock(&xn->hash_lock);
return est;
}
EXPORT_SYMBOL_GPL(xt_rateest_lookup);
-void xt_rateest_put(struct xt_rateest *est)
+void xt_rateest_put(struct net *net, struct xt_rateest *est)
{
- mutex_lock(&xt_rateest_mutex);
+ struct xt_rateest_net *xn = net_generic(net, xt_rateest_id);
+
+ mutex_lock(&xn->hash_lock);
if (--est->refcnt == 0) {
hlist_del(&est->list);
gen_kill_estimator(&est->rate_est);
@@ -78,7 +89,7 @@ void xt_rateest_put(struct xt_rateest *est)
*/
kfree_rcu(est, rcu);
}
- mutex_unlock(&xt_rateest_mutex);
+ mutex_unlock(&xn->hash_lock);
}
EXPORT_SYMBOL_GPL(xt_rateest_put);
@@ -98,6 +109,7 @@ xt_rateest_tg(struct sk_buff *skb, const struct xt_action_param *par)
static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
{
+ struct xt_rateest_net *xn = net_generic(par->net, xt_rateest_id);
struct xt_rateest_target_info *info = par->targinfo;
struct xt_rateest *est;
struct {
@@ -108,10 +120,10 @@ static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
net_get_random_once(&jhash_rnd, sizeof(jhash_rnd));
- mutex_lock(&xt_rateest_mutex);
- est = __xt_rateest_lookup(info->name);
+ mutex_lock(&xn->hash_lock);
+ est = __xt_rateest_lookup(xn, info->name);
if (est) {
- mutex_unlock(&xt_rateest_mutex);
+ mutex_unlock(&xn->hash_lock);
/*
* If estimator parameters are specified, they must match the
* existing estimator.
@@ -119,7 +131,7 @@ static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
if ((!info->interval && !info->ewma_log) ||
(info->interval != est->params.interval ||
info->ewma_log != est->params.ewma_log)) {
- xt_rateest_put(est);
+ xt_rateest_put(par->net, est);
return -EINVAL;
}
info->est = est;
@@ -148,14 +160,14 @@ static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
goto err2;
info->est = est;
- xt_rateest_hash_insert(est);
- mutex_unlock(&xt_rateest_mutex);
+ xt_rateest_hash_insert(xn, est);
+ mutex_unlock(&xn->hash_lock);
return 0;
err2:
kfree(est);
err1:
- mutex_unlock(&xt_rateest_mutex);
+ mutex_unlock(&xn->hash_lock);
return ret;
}
@@ -163,7 +175,7 @@ static void xt_rateest_tg_destroy(const struct xt_tgdtor_param *par)
{
struct xt_rateest_target_info *info = par->targinfo;
- xt_rateest_put(info->est);
+ xt_rateest_put(par->net, info->est);
}
static struct xt_target xt_rateest_tg_reg __read_mostly = {
@@ -178,19 +190,46 @@ static struct xt_target xt_rateest_tg_reg __read_mostly = {
.me = THIS_MODULE,
};
-static int __init xt_rateest_tg_init(void)
+static __net_init int xt_rateest_net_init(struct net *net)
+{
+ struct xt_rateest_net *xn = net_generic(net, xt_rateest_id);
+ int i;
+
+ mutex_init(&xn->hash_lock);
+ for (i = 0; i < ARRAY_SIZE(xn->hash); i++)
+ INIT_HLIST_HEAD(&xn->hash[i]);
+ return 0;
+}
+
+static void __net_exit xt_rateest_net_exit(struct net *net)
{
- unsigned int i;
+ struct xt_rateest_net *xn = net_generic(net, xt_rateest_id);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(xn->hash); i++)
+ WARN_ON_ONCE(!hlist_empty(&xn->hash[i]));
+}
- for (i = 0; i < ARRAY_SIZE(rateest_hash); i++)
- INIT_HLIST_HEAD(&rateest_hash[i]);
+static struct pernet_operations xt_rateest_net_ops = {
+ .init = xt_rateest_net_init,
+ .exit = xt_rateest_net_exit,
+ .id = &xt_rateest_id,
+ .size = sizeof(struct xt_rateest_net),
+};
+
+static int __init xt_rateest_tg_init(void)
+{
+ int err = register_pernet_subsys(&xt_rateest_net_ops);
+ if (err)
+ return err;
return xt_register_target(&xt_rateest_tg_reg);
}
static void __exit xt_rateest_tg_fini(void)
{
xt_unregister_target(&xt_rateest_tg_reg);
+ unregister_pernet_subsys(&xt_rateest_net_ops);
}
diff --git a/net/netfilter/xt_rateest.c b/net/netfilter/xt_rateest.c
index 755d2f6693a2..bf77326861af 100644
--- a/net/netfilter/xt_rateest.c
+++ b/net/netfilter/xt_rateest.c
@@ -95,13 +95,13 @@ static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
}
ret = -ENOENT;
- est1 = xt_rateest_lookup(info->name1);
+ est1 = xt_rateest_lookup(par->net, info->name1);
if (!est1)
goto err1;
est2 = NULL;
if (info->flags & XT_RATEEST_MATCH_REL) {
- est2 = xt_rateest_lookup(info->name2);
+ est2 = xt_rateest_lookup(par->net, info->name2);
if (!est2)
goto err2;
}
@@ -111,7 +111,7 @@ static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
return 0;
err2:
- xt_rateest_put(est1);
+ xt_rateest_put(par->net, est1);
err1:
return ret;
}
@@ -120,9 +120,9 @@ static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
{
struct xt_rateest_match_info *info = par->matchinfo;
- xt_rateest_put(info->est1);
+ xt_rateest_put(par->net, info->est1);
if (info->est2)
- xt_rateest_put(info->est2);
+ xt_rateest_put(par->net, info->est2);
}
static struct xt_match xt_rateest_mt_reg __read_mostly = {
--
2.13.0
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