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authorStephen Hemminger <shemminger@vyatta.com>2009-02-20 10:35:32 +0100
committerPatrick McHardy <kaber@trash.net>2009-02-20 10:35:32 +0100
commit784544739a25c30637397ace5489eeb6e15d7d49 (patch)
treec48bbf30f3eb753858de9a03b74e81925cf39018 /net/ipv4
parent323dbf96382f057d035afce0237f08e18571ac1d (diff)
netfilter: iptables: lock free counters
The reader/writer lock in ip_tables is acquired in the critical path of processing packets and is one of the reasons just loading iptables can cause a 20% performance loss. The rwlock serves two functions: 1) it prevents changes to table state (xt_replace) while table is in use. This is now handled by doing rcu on the xt_table. When table is replaced, the new table(s) are put in and the old one table(s) are freed after RCU period. 2) it provides synchronization when accesing the counter values. This is now handled by swapping in new table_info entries for each cpu then summing the old values, and putting the result back onto one cpu. On a busy system it may cause sampling to occur at different times on each cpu, but no packet/byte counts are lost in the process. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Sucessfully tested on my dual quad core machine too, but iptables only (no ipv6 here) BTW, my new "tbench 8" result is 2450 MB/s, (it was 2150 MB/s not so long ago) Acked-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/arp_tables.c115
-rw-r--r--net/ipv4/netfilter/ip_tables.c120
2 files changed, 175 insertions, 60 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index b5db4634261..64a7c6ce0b9 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -261,9 +261,10 @@ unsigned int arpt_do_table(struct sk_buff *skb,
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
- read_lock_bh(&table->lock);
- private = table->private;
- table_base = (void *)private->entries[smp_processor_id()];
+ rcu_read_lock();
+ private = rcu_dereference(table->private);
+ table_base = rcu_dereference(private->entries[smp_processor_id()]);
+
e = get_entry(table_base, private->hook_entry[hook]);
back = get_entry(table_base, private->underflow[hook]);
@@ -335,7 +336,8 @@ unsigned int arpt_do_table(struct sk_buff *skb,
e = (void *)e + e->next_offset;
}
} while (!hotdrop);
- read_unlock_bh(&table->lock);
+
+ rcu_read_unlock();
if (hotdrop)
return NF_DROP;
@@ -738,11 +740,65 @@ static void get_counters(const struct xt_table_info *t,
}
}
-static inline struct xt_counters *alloc_counters(struct xt_table *table)
+
+/* We're lazy, and add to the first CPU; overflow works its fey magic
+ * and everything is OK. */
+static int
+add_counter_to_entry(struct arpt_entry *e,
+ const struct xt_counters addme[],
+ unsigned int *i)
+{
+ ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
+
+ (*i)++;
+ return 0;
+}
+
+/* Take values from counters and add them back onto the current cpu */
+static void put_counters(struct xt_table_info *t,
+ const struct xt_counters counters[])
+{
+ unsigned int i, cpu;
+
+ local_bh_disable();
+ cpu = smp_processor_id();
+ i = 0;
+ ARPT_ENTRY_ITERATE(t->entries[cpu],
+ t->size,
+ add_counter_to_entry,
+ counters,
+ &i);
+ local_bh_enable();
+}
+
+static inline int
+zero_entry_counter(struct arpt_entry *e, void *arg)
+{
+ e->counters.bcnt = 0;
+ e->counters.pcnt = 0;
+ return 0;
+}
+
+static void
+clone_counters(struct xt_table_info *newinfo, const struct xt_table_info *info)
+{
+ unsigned int cpu;
+ const void *loc_cpu_entry = info->entries[raw_smp_processor_id()];
+
+ memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
+ for_each_possible_cpu(cpu) {
+ memcpy(newinfo->entries[cpu], loc_cpu_entry, info->size);
+ ARPT_ENTRY_ITERATE(newinfo->entries[cpu], newinfo->size,
+ zero_entry_counter, NULL);
+ }
+}
+
+static struct xt_counters *alloc_counters(struct xt_table *table)
{
unsigned int countersize;
struct xt_counters *counters;
- const struct xt_table_info *private = table->private;
+ struct xt_table_info *private = table->private;
+ struct xt_table_info *info;
/* We need atomic snapshot of counters: rest doesn't change
* (other than comefrom, which userspace doesn't care
@@ -752,14 +808,30 @@ static inline struct xt_counters *alloc_counters(struct xt_table *table)
counters = vmalloc_node(countersize, numa_node_id());
if (counters == NULL)
- return ERR_PTR(-ENOMEM);
+ goto nomem;
+
+ info = xt_alloc_table_info(private->size);
+ if (!info)
+ goto free_counters;
- /* First, sum counters... */
- write_lock_bh(&table->lock);
- get_counters(private, counters);
- write_unlock_bh(&table->lock);
+ clone_counters(info, private);
+
+ mutex_lock(&table->lock);
+ xt_table_entry_swap_rcu(private, info);
+ synchronize_net(); /* Wait until smoke has cleared */
+
+ get_counters(info, counters);
+ put_counters(private, counters);
+ mutex_unlock(&table->lock);
+
+ xt_free_table_info(info);
return counters;
+
+ free_counters:
+ vfree(counters);
+ nomem:
+ return ERR_PTR(-ENOMEM);
}
static int copy_entries_to_user(unsigned int total_size,
@@ -1099,20 +1171,6 @@ static int do_replace(struct net *net, void __user *user, unsigned int len)
return ret;
}
-/* We're lazy, and add to the first CPU; overflow works its fey magic
- * and everything is OK.
- */
-static inline int add_counter_to_entry(struct arpt_entry *e,
- const struct xt_counters addme[],
- unsigned int *i)
-{
-
- ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
-
- (*i)++;
- return 0;
-}
-
static int do_add_counters(struct net *net, void __user *user, unsigned int len,
int compat)
{
@@ -1172,13 +1230,14 @@ static int do_add_counters(struct net *net, void __user *user, unsigned int len,
goto free;
}
- write_lock_bh(&t->lock);
+ mutex_lock(&t->lock);
private = t->private;
if (private->number != num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}
+ preempt_disable();
i = 0;
/* Choose the copy that is on our node */
loc_cpu_entry = private->entries[smp_processor_id()];
@@ -1187,8 +1246,10 @@ static int do_add_counters(struct net *net, void __user *user, unsigned int len,
add_counter_to_entry,
paddc,
&i);
+ preempt_enable();
unlock_up_free:
- write_unlock_bh(&t->lock);
+ mutex_unlock(&t->lock);
+
xt_table_unlock(t);
module_put(t->me);
free:
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index ef8b6ca068b..08cde5bd70a 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -347,10 +347,12 @@ ipt_do_table(struct sk_buff *skb,
mtpar.family = tgpar.family = NFPROTO_IPV4;
tgpar.hooknum = hook;
- read_lock_bh(&table->lock);
IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- private = table->private;
- table_base = (void *)private->entries[smp_processor_id()];
+
+ rcu_read_lock();
+ private = rcu_dereference(table->private);
+ table_base = rcu_dereference(private->entries[smp_processor_id()]);
+
e = get_entry(table_base, private->hook_entry[hook]);
/* For return from builtin chain */
@@ -445,7 +447,7 @@ ipt_do_table(struct sk_buff *skb,
}
} while (!hotdrop);
- read_unlock_bh(&table->lock);
+ rcu_read_unlock();
#ifdef DEBUG_ALLOW_ALL
return NF_ACCEPT;
@@ -924,13 +926,68 @@ get_counters(const struct xt_table_info *t,
counters,
&i);
}
+
+}
+
+/* We're lazy, and add to the first CPU; overflow works its fey magic
+ * and everything is OK. */
+static int
+add_counter_to_entry(struct ipt_entry *e,
+ const struct xt_counters addme[],
+ unsigned int *i)
+{
+ ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
+
+ (*i)++;
+ return 0;
+}
+
+/* Take values from counters and add them back onto the current cpu */
+static void put_counters(struct xt_table_info *t,
+ const struct xt_counters counters[])
+{
+ unsigned int i, cpu;
+
+ local_bh_disable();
+ cpu = smp_processor_id();
+ i = 0;
+ IPT_ENTRY_ITERATE(t->entries[cpu],
+ t->size,
+ add_counter_to_entry,
+ counters,
+ &i);
+ local_bh_enable();
+}
+
+
+static inline int
+zero_entry_counter(struct ipt_entry *e, void *arg)
+{
+ e->counters.bcnt = 0;
+ e->counters.pcnt = 0;
+ return 0;
+}
+
+static void
+clone_counters(struct xt_table_info *newinfo, const struct xt_table_info *info)
+{
+ unsigned int cpu;
+ const void *loc_cpu_entry = info->entries[raw_smp_processor_id()];
+
+ memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
+ for_each_possible_cpu(cpu) {
+ memcpy(newinfo->entries[cpu], loc_cpu_entry, info->size);
+ IPT_ENTRY_ITERATE(newinfo->entries[cpu], newinfo->size,
+ zero_entry_counter, NULL);
+ }
}
static struct xt_counters * alloc_counters(struct xt_table *table)
{
unsigned int countersize;
struct xt_counters *counters;
- const struct xt_table_info *private = table->private;
+ struct xt_table_info *private = table->private;
+ struct xt_table_info *info;
/* We need atomic snapshot of counters: rest doesn't change
(other than comefrom, which userspace doesn't care
@@ -939,14 +996,30 @@ static struct xt_counters * alloc_counters(struct xt_table *table)
counters = vmalloc_node(countersize, numa_node_id());
if (counters == NULL)
- return ERR_PTR(-ENOMEM);
+ goto nomem;
- /* First, sum counters... */
- write_lock_bh(&table->lock);
- get_counters(private, counters);
- write_unlock_bh(&table->lock);
+ info = xt_alloc_table_info(private->size);
+ if (!info)
+ goto free_counters;
+
+ clone_counters(info, private);
+
+ mutex_lock(&table->lock);
+ xt_table_entry_swap_rcu(private, info);
+ synchronize_net(); /* Wait until smoke has cleared */
+
+ get_counters(info, counters);
+ put_counters(private, counters);
+ mutex_unlock(&table->lock);
+
+ xt_free_table_info(info);
return counters;
+
+ free_counters:
+ vfree(counters);
+ nomem:
+ return ERR_PTR(-ENOMEM);
}
static int
@@ -1312,27 +1385,6 @@ do_replace(struct net *net, void __user *user, unsigned int len)
return ret;
}
-/* We're lazy, and add to the first CPU; overflow works its fey magic
- * and everything is OK. */
-static int
-add_counter_to_entry(struct ipt_entry *e,
- const struct xt_counters addme[],
- unsigned int *i)
-{
-#if 0
- duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n",
- *i,
- (long unsigned int)e->counters.pcnt,
- (long unsigned int)e->counters.bcnt,
- (long unsigned int)addme[*i].pcnt,
- (long unsigned int)addme[*i].bcnt);
-#endif
-
- ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
-
- (*i)++;
- return 0;
-}
static int
do_add_counters(struct net *net, void __user *user, unsigned int len, int compat)
@@ -1393,13 +1445,14 @@ do_add_counters(struct net *net, void __user *user, unsigned int len, int compat
goto free;
}
- write_lock_bh(&t->lock);
+ mutex_lock(&t->lock);
private = t->private;
if (private->number != num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}
+ preempt_disable();
i = 0;
/* Choose the copy that is on our node */
loc_cpu_entry = private->entries[raw_smp_processor_id()];
@@ -1408,8 +1461,9 @@ do_add_counters(struct net *net, void __user *user, unsigned int len, int compat
add_counter_to_entry,
paddc,
&i);
+ preempt_enable();
unlock_up_free:
- write_unlock_bh(&t->lock);
+ mutex_unlock(&t->lock);
xt_table_unlock(t);
module_put(t->me);
free: