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net: rps: protect filter locklessly

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As we can see, rflow->filter can be written/read concurrently, so
lockless access is needed.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Xing 2024-04-18 15:36:02 +08:00 committed by David S. Miller
parent 84b6823cd9
commit f00bf5dc83
1 changed files with 4 additions and 4 deletions
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8
net/core/dev.c
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@ -4530,9 +4530,9 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
goto out;
old_rflow = rflow;
rflow = &flow_table->flows[flow_id];
rflow->filter = rc;
if (old_rflow->filter == rflow->filter)
old_rflow->filter = RPS_NO_FILTER;
WRITE_ONCE(rflow->filter, rc);
if (old_rflow->filter == rc)
WRITE_ONCE(old_rflow->filter, RPS_NO_FILTER);
out:
#endif
head = READ_ONCE(per_cpu(softnet_data, next_cpu).input_queue_head);
@ -4672,7 +4672,7 @@ bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
if (flow_table && flow_id <= flow_table->mask) {
rflow = &flow_table->flows[flow_id];
cpu = READ_ONCE(rflow->cpu);
if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
if (READ_ONCE(rflow->filter) == filter_id && cpu < nr_cpu_ids &&
((int)(READ_ONCE(per_cpu(softnet_data, cpu).input_queue_head) -
READ_ONCE(rflow->last_qtail)) <
(int)(10 * flow_table->mask)))