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Message-Id: <20240416074232.23525-2-kerneljasonxing@gmail.com> Date: Tue, 16 Apr 2024 15:42:30 +0800 From: Jason Xing <kerneljasonxing@...il.com> To: edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, davem@...emloft.net, horms@...nel.org Cc: netdev@...r.kernel.org, kerneljasonxing@...il.com, Jason Xing <kernelxing@...cent.com> Subject: [PATCH net-next 1/3] net: rps: protect last_qtail with rps_input_queue_tail_save() helper From: Jason Xing <kernelxing@...cent.com> Only one left place should be proctected locklessly. This patch made it. Signed-off-by: Jason Xing <kernelxing@...cent.com> --- net/core/dev.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 854a3a28a8d8..cd97eeae8218 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4501,7 +4501,7 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb, struct netdev_rx_queue *rxqueue; struct rps_dev_flow_table *flow_table; struct rps_dev_flow *old_rflow; - u32 flow_id; + u32 flow_id, head; u16 rxq_index; int rc; @@ -4529,8 +4529,8 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb, old_rflow->filter = RPS_NO_FILTER; out: #endif - rflow->last_qtail = - READ_ONCE(per_cpu(softnet_data, next_cpu).input_queue_head); + head = READ_ONCE(per_cpu(softnet_data, next_cpu).input_queue_head); + rps_input_queue_tail_save(rflow->last_qtail, head); } rflow->cpu = next_cpu; -- 2.37.3
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