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netfilter: flowtable: fix excessive hw offload attempts after failure

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[ Upstream commit 396ef64113 ]

If a flow cannot be offloaded, the code currently repeatedly tries again as
quickly as possible, which can significantly increase system load.
Fix this by limiting flow timeout update and hardware offload retry to once
per second.

Fixes: c07531c01d ("netfilter: flowtable: Remove redundant hw refresh bit")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Felix Fietkau
2022-05-09 14:26:13 +02:00
committed by Greg Kroah-Hartman
parent c22ee3a067
commit 5f4197a020
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/nf_flow_table_core.c
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@@ -329,8 +329,10 @@ void flow_offload_refresh(struct nf_flowtable *flow_table,
u32 timeout;
timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow);
if (READ_ONCE(flow->timeout) != timeout)
if (timeout - READ_ONCE(flow->timeout) > HZ)
WRITE_ONCE(flow->timeout, timeout);
else
return;
if (likely(!nf_flowtable_hw_offload(flow_table)))
return;