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Message-Id: <20240416074232.23525-4-kerneljasonxing@gmail.com>
Date: Tue, 16 Apr 2024 15:42:32 +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 3/3] net: rps: locklessly access rflow->cpu
From: Jason Xing <kernelxing@...cent.com>
This is the last member in struct rps_dev_flow which should be
protected locklessly. So finish it.
Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
net/core/dev.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 6892682f9cbf..6003553c05fc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4533,7 +4533,7 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
rps_input_queue_tail_save(rflow->last_qtail, head);
}
- rflow->cpu = next_cpu;
+ WRITE_ONCE(rflow->cpu, next_cpu);
return rflow;
}
@@ -4597,7 +4597,7 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
* we can look at the local (per receive queue) flow table
*/
rflow = &flow_table->flows[hash & flow_table->mask];
- tcpu = rflow->cpu;
+ tcpu = READ_ONCE(rflow->cpu);
/*
* If the desired CPU (where last recvmsg was done) is
--
2.37.3
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