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netfilter: flowtable: avoid possible false sharing 

The flowtable follows the same timeout approach as conntrack, use the
same idiom as in cc16921351 ("netfilter: conntrack: avoid same-timeout
update") but also include the fix provided by e37542ba11 ("netfilter:
conntrack: avoid possible false sharing").

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-07-17 10:10:29 +02:00
parent cfbe3650dd
commit 32c3973d80
1 changed files with 5 additions and 1 deletions
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6
net/netfilter/nf_flow_table_core.c
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@ -331,7 +331,11 @@ EXPORT_SYMBOL_GPL(flow_offload_add);
void flow_offload_refresh(struct nf_flowtable *flow_table,
struct flow_offload *flow)
{
flow->timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow);
u32 timeout;
timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow);
if (READ_ONCE(flow->timeout) != timeout)
WRITE_ONCE(flow->timeout, timeout);
if (likely(!nf_flowtable_hw_offload(flow_table)))
return;