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netfilter: {ip,ip6,arp}_tables: dont block bottom half more than necessary

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We currently disable BH for the whole duration of get_counters()

On machines with a lot of cpus and large tables, this might be too long.

We can disable preemption during the whole function, and disable BH only
while fetching counters for the current cpu.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Eric Dumazet 2010-08-02 16:49:01 +02:00 • committed by Patrick McHardy
commit 24b36f0193
3 changed files with 18 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

10
net/ipv4/netfilter/arp_tables.c
View file

@ -710,7 +710,7 @@ static void get_counters(const struct xt_table_info *t,
struct arpt_entry *iter;
unsigned int cpu;
unsigned int i;
unsigned int curcpu;
unsigned int curcpu = get_cpu();
/* Instead of clearing (by a previous call to memset())
* the counters and using adds, we set the counters
@ -720,14 +720,16 @@ static void get_counters(const struct xt_table_info *t,
* if new softirq were to run and call ipt_do_table
*/
local_bh_disable();
curcpu = smp_processor_id();
i = 0;
xt_entry_foreach(iter, t->entries[curcpu], t->size) {
SET_COUNTER(counters[i], iter->counters.bcnt,
iter->counters.pcnt);
++i;
}
local_bh_enable();
/* Processing counters from other cpus, we can let bottom half enabled,
* (preemption is disabled)
*/
for_each_possible_cpu(cpu) {
if (cpu == curcpu)
@ -741,7 +743,7 @@ static void get_counters(const struct xt_table_info *t,
}
xt_info_wrunlock(cpu);
}
local_bh_enable();
put_cpu();
}
static struct xt_counters *alloc_counters(const struct xt_table *table)

10
net/ipv4/netfilter/ip_tables.c
View file

@ -884,7 +884,7 @@ get_counters(const struct xt_table_info *t,
struct ipt_entry *iter;
unsigned int cpu;
unsigned int i;
unsigned int curcpu;
unsigned int curcpu = get_cpu();
/* Instead of clearing (by a previous call to memset())
* the counters and using adds, we set the counters
@ -894,14 +894,16 @@ get_counters(const struct xt_table_info *t,
* if new softirq were to run and call ipt_do_table
*/
local_bh_disable();
curcpu = smp_processor_id();
i = 0;
xt_entry_foreach(iter, t->entries[curcpu], t->size) {
SET_COUNTER(counters[i], iter->counters.bcnt,
iter->counters.pcnt);
++i;
}
local_bh_enable();
/* Processing counters from other cpus, we can let bottom half enabled,
* (preemption is disabled)
*/
for_each_possible_cpu(cpu) {
if (cpu == curcpu)
@ -915,7 +917,7 @@ get_counters(const struct xt_table_info *t,
}
xt_info_wrunlock(cpu);
}
local_bh_enable();
put_cpu();
}
static struct xt_counters *alloc_counters(const struct xt_table *table)

10
net/ipv6/netfilter/ip6_tables.c
View file

@ -897,7 +897,7 @@ get_counters(const struct xt_table_info *t,
struct ip6t_entry *iter;
unsigned int cpu;
unsigned int i;
unsigned int curcpu;
unsigned int curcpu = get_cpu();
/* Instead of clearing (by a previous call to memset())
* the counters and using adds, we set the counters
@ -907,14 +907,16 @@ get_counters(const struct xt_table_info *t,
* if new softirq were to run and call ipt_do_table
*/
local_bh_disable();
curcpu = smp_processor_id();
i = 0;
xt_entry_foreach(iter, t->entries[curcpu], t->size) {
SET_COUNTER(counters[i], iter->counters.bcnt,
iter->counters.pcnt);
++i;
}
local_bh_enable();
/* Processing counters from other cpus, we can let bottom half enabled,
* (preemption is disabled)
*/
for_each_possible_cpu(cpu) {
if (cpu == curcpu)
@ -928,7 +930,7 @@ get_counters(const struct xt_table_info *t,
}
xt_info_wrunlock(cpu);
}
local_bh_enable();
put_cpu();
}
static struct xt_counters *alloc_counters(const struct xt_table *table)