reduce the total cpu usage of ipt_do_table under high network load from 3.1% down to 1.6% (tested with oprofile)
SVN-Revision: 15822
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4ab19ddbd5
commit
251a81b192
3 changed files with 129 additions and 0 deletions
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@ -75,3 +75,46 @@
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}
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#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
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@@ -332,8 +358,27 @@ ipt_do_table(struct sk_buff *skb,
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struct xt_match_param mtpar;
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struct xt_target_param tgpar;
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- /* Initialization */
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ip = ip_hdr(skb);
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+
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+ read_lock_bh(&table->lock);
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+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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+ private = table->private;
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+ table_base = (void *)private->entries[smp_processor_id()];
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+ e = get_entry(table_base, private->hook_entry[hook]);
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+ if (e->target_offset <= sizeof(struct ipt_entry) &&
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+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
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+ struct ipt_entry_target *t = ipt_get_target(e);
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+ if (!t->u.kernel.target->target) {
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+ int v = ((struct ipt_standard_target *)t)->verdict;
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+ if ((v < 0) && (v != IPT_RETURN)) {
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+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
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+ read_unlock_bh(&table->lock);
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+ return (unsigned)(-v) - 1;
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+ }
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+ }
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+ }
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+
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+ /* Initialization */
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datalen = skb->len - ip->ihl * 4;
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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@@ -351,12 +396,6 @@ ipt_do_table(struct sk_buff *skb,
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mtpar.family = tgpar.family = NFPROTO_IPV4;
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tgpar.hooknum = hook;
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- read_lock_bh(&table->lock);
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- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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- private = table->private;
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- table_base = (void *)private->entries[smp_processor_id()];
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- e = get_entry(table_base, private->hook_entry[hook]);
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-
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/* For return from builtin chain */
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back = get_entry(table_base, private->underflow[hook]);
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@ -75,3 +75,45 @@
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}
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#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
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@@ -328,8 +354,27 @@ ipt_do_table(struct sk_buff *skb,
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struct xt_match_param mtpar;
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struct xt_target_param tgpar;
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- /* Initialization */
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ip = ip_hdr(skb);
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+
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+ read_lock_bh(&table->lock);
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+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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+ private = table->private;
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+ table_base = (void *)private->entries[smp_processor_id()];
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+ e = get_entry(table_base, private->hook_entry[hook]);
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+ if (e->target_offset <= sizeof(struct ipt_entry) &&
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+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
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+ struct ipt_entry_target *t = ipt_get_target(e);
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+ if (!t->u.kernel.target->target) {
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+ int v = ((struct ipt_standard_target *)t)->verdict;
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+ if ((v < 0) && (v != IPT_RETURN)) {
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+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
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+ read_unlock_bh(&table->lock);
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+ return (unsigned)(-v) - 1;
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+ }
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+ }
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+ }
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+
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+ /* Initialization */
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datalen = skb->len - ip->ihl * 4;
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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@@ -347,12 +392,6 @@ ipt_do_table(struct sk_buff *skb,
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mtpar.family = tgpar.family = NFPROTO_IPV4;
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tgpar.hooknum = hook;
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- read_lock_bh(&table->lock);
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- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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- private = table->private;
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- table_base = (void *)private->entries[smp_processor_id()];
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- e = get_entry(table_base, private->hook_entry[hook]);
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-
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/* For return from builtin chain */
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back = get_entry(table_base, private->underflow[hook]);
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@ -75,3 +75,47 @@
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}
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#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
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@@ -318,8 +344,28 @@ ipt_do_table(struct sk_buff *skb,
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struct xt_match_param mtpar;
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struct xt_target_param tgpar;
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- /* Initialization */
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ip = ip_hdr(skb);
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+
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+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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+ xt_info_rdlock_bh();
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+ private = table->private;
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+ table_base = private->entries[smp_processor_id()];
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+ e = get_entry(table_base, private->hook_entry[hook]);
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+
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+ if (e->target_offset <= sizeof(struct ipt_entry) &&
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+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
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+ struct ipt_entry_target *t = ipt_get_target(e);
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+ if (!t->u.kernel.target->target) {
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+ int v = ((struct ipt_standard_target *)t)->verdict;
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+ if ((v < 0) && (v != IPT_RETURN)) {
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+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
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+ read_unlock_bh(&table->lock);
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+ return (unsigned)(-v) - 1;
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+ }
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+ }
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+ }
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+
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+ /* Initialization */
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datalen = skb->len - ip->ihl * 4;
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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@@ -337,13 +383,6 @@ ipt_do_table(struct sk_buff *skb,
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mtpar.family = tgpar.family = NFPROTO_IPV4;
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tgpar.hooknum = hook;
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- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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- xt_info_rdlock_bh();
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- private = table->private;
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- table_base = private->entries[smp_processor_id()];
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-
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- e = get_entry(table_base, private->hook_entry[hook]);
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-
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/* For return from builtin chain */
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back = get_entry(table_base, private->underflow[hook]);
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