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netfilter: x_tables: remove XT_TABLE_INFO_SZ and a dereference.

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After Florian patches, there is no need for XT_TABLE_INFO_SZ anymore :
Only one copy of table is kept, instead of one copy per cpu.

We also can avoid a dereference if we put table data right after
xt_table_info. It reduces register pressure and helps compiler.

Then, we attempt a kmalloc() if total size is under order-3 allocation,
to reduce TLB pressure, as in many cases, rules fit in 32 KB.

Signed-off-by: Eric Dumazet <[email protected]>
Cc: Florian Westphal <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Eric Dumazet 2015-06-15 09:57:30 -07:00 • committed by Pablo Neira Ayuso
commit 711bdde6a8
5 changed files with 19 additions and 30 deletions
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4
net/ipv6/netfilter/ip6_tables.c
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@ -951,7 +951,7 @@ copy_entries_to_user(unsigned int total_size,
struct xt_counters *counters;
const struct xt_table_info *private = table->private;
int ret = 0;
void *loc_cpu_entry;
const void *loc_cpu_entry;
counters = alloc_counters(table);
if (IS_ERR(counters))
@ -1065,7 +1065,7 @@ static int compat_table_info(const struct xt_table_info *info,
struct xt_table_info *newinfo)
{
struct ip6t_entry *iter;
void *loc_cpu_entry;
const void *loc_cpu_entry;
int ret;
if (!newinfo || !info)