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Message-Id: <1271300513-9995-1-git-send-email-xiaosuo@gmail.com>
Date: Thu, 15 Apr 2010 11:01:53 +0800
From: Changli Gao <xiaosuo@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Tom Herbert <therbert@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] net: fix softnet_stat
fix softnet_stat
Per cpu variable softnet_data.total was shared between IRQ and SoftIRQ context
without any protection. And enqueue_to_backlog should update the netdev_rx_stat
of the target CPU.
This patch changes the meaning of softnet_data.total to the number of packets
processed, not includes dropped, in order to avoid it sharing between IRQ and
SoftIRQ. And softnet_data.dropped is protected in the corresponding
input_pkt_queue.lock, if RPS is enabled.
Signed-off-by: Changli Gao <xiaosuo@...il.com>
----
net/core/dev.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index a10a216..b38a991 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2336,7 +2336,6 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu)
queue = &per_cpu(softnet_data, cpu);
local_irq_save(flags);
- __get_cpu_var(netdev_rx_stat).total++;
rps_lock(queue);
if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
@@ -2366,9 +2365,9 @@ enqueue:
goto enqueue;
}
+ per_cpu(netdev_rx_stat, cpu).dropped++;
rps_unlock(queue);
- __get_cpu_var(netdev_rx_stat).dropped++;
local_irq_restore(flags);
kfree_skb(skb);
@@ -3565,7 +3564,7 @@ static int softnet_seq_show(struct seq_file *seq, void *v)
struct netif_rx_stats *s = v;
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
- s->total, s->dropped, s->time_squeeze, 0,
+ s->total + s->dropped, s->dropped, s->time_squeeze, 0,
0, 0, 0, 0, /* was fastroute */
s->cpu_collision, s->received_rps);
return 0;
--
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