netfilter: nf_conntrack: per_cpu untracking
NOTRACK makes all cpus share a cache line on nf_conntrack_untracked
twice per packet, slowing down performance.
This patch converts it to a per_cpu variable.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 6c1da21..9c66141 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -62,8 +62,8 @@
unsigned int nf_conntrack_max __read_mostly;
EXPORT_SYMBOL_GPL(nf_conntrack_max);
-struct nf_conn nf_conntrack_untracked;
-EXPORT_SYMBOL_GPL(nf_conntrack_untracked);
+DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
+EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked);
static int nf_conntrack_hash_rnd_initted;
static unsigned int nf_conntrack_hash_rnd;
@@ -1183,10 +1183,21 @@
spin_unlock_bh(&nf_conntrack_lock);
}
+static int untrack_refs(void)
+{
+ int cnt = 0, cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu);
+
+ cnt += atomic_read(&ct->ct_general.use) - 1;
+ }
+ return cnt;
+}
+
static void nf_conntrack_cleanup_init_net(void)
{
- /* wait until all references to nf_conntrack_untracked are dropped */
- while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1)
+ while (untrack_refs() > 0)
schedule();
nf_conntrack_helper_fini();
@@ -1323,14 +1334,17 @@
void nf_ct_untracked_status_or(unsigned long bits)
{
- nf_conntrack_untracked.status |= bits;
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ per_cpu(nf_conntrack_untracked, cpu).status |= bits;
}
EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or);
static int nf_conntrack_init_init_net(void)
{
int max_factor = 8;
- int ret;
+ int ret, cpu;
/* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB
* machine has 512 buckets. >= 1GB machines have 16384 buckets. */
@@ -1369,10 +1383,12 @@
goto err_extend;
#endif
/* Set up fake conntrack: to never be deleted, not in any hashes */
-#ifdef CONFIG_NET_NS
- nf_conntrack_untracked.ct_net = &init_net;
-#endif
- atomic_set(&nf_conntrack_untracked.ct_general.use, 1);
+ for_each_possible_cpu(cpu) {
+ struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu);
+
+ write_pnet(&ct->ct_net, &init_net);
+ atomic_set(&ct->ct_general.use, 1);
+ }
/* - and look it like as a confirmed connection */
nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED);
return 0;