netdev - Re: [PATCH v3] net: fix softnet

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Date:	Sun, 02 May 2010 18:43:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v3] net: fix softnet_stat

Le dimanche 02 mai 2010 à 23:42 +0800, Changli Gao a écrit :
> 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 renames softnet_data.total to softnet_data.processed: the number of
> packets processed in uppper levels(IP stacks).
> 
> softnet_stat data is moved into softnet_data.
> 
> Signed-off-by: Changli Gao <xiaosuo@...il.com>

Thats a fine patch, thanks Changli.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>


>  
> @@ -5869,6 +5866,7 @@ static int __init net_dev_init(void)
>  	for_each_possible_cpu(i) {
>  		struct softnet_data *sd = &per_cpu(softnet_data, i);
>  
> +		memset(sd, 0, sizeof(*sd));
>  		skb_queue_head_init(&sd->input_pkt_queue);
>  		skb_queue_head_init(&sd->process_queue);
>  		sd->completion_queue = NULL;

Minor note : 
- You could have removed some NULL initializations after the memset()
- Also, per_cpu data is already 0 initialized, so memset() is not
strictly needed ;)

This is very minor, since we dont have a bss section in per_cpu data, so
it doesnt matter.



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