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| author | Jason Xing <kernelxing@tencent.com> | 2024-04-18 15:36:02 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-04-19 11:38:03 +0100 |
| commit | f00bf5dc83202fd9f75bde80e46c3a747c34cc6a (patch) | |
| tree | d50897be1abcfc81b44c08559effc1bfac29faa5 | |
| parent | 84b6823cd96b38c40b3b30beabbfa48d92990e1a (diff) | |
| download | linux-f00bf5dc83202fd9f75bde80e46c3a747c34cc6a.tar.gz linux-f00bf5dc83202fd9f75bde80e46c3a747c34cc6a.tar.bz2 linux-f00bf5dc83202fd9f75bde80e46c3a747c34cc6a.zip | |
net: rps: protect filter locklessly
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>
| -rw-r--r-- | net/core/dev.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 6f027f676243..182fce2537d4 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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))) |