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

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>

1 files changed, 6 insertions, 4 deletions

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 33113c1ea02f..5359ef4daac5 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -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)