netdev - Re: [PATCH 1/4] net: make dev_kfree_skb

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Date:	Thu, 14 Dec 2006 22:30:09 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Stephen Hemminger <shemminger@...l.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/4] net: make dev_kfree_skb_irq not inline

On Thu, Dec 14, 2006 at 12:48:15PM -0800, Stephen Hemminger wrote:
> Move the dev_kfree_skb_irq function from netdevice.h to dev.c
> for a couple of reasons. Primarily, I want to make softnet_data
> local to dev.c; also this function is called 300+ places already.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...l.org>
> 
> --- linux-2.6.20-rc1.orig/include/linux/netdevice.h
> +++ linux-2.6.20-rc1/include/linux/netdevice.h
> @@ -676,20 +676,7 @@ static inline int netif_running(const st
>  /* Use this variant when it is known for sure that it
>   * is executing from interrupt context.
>   */
> -static inline void dev_kfree_skb_irq(struct sk_buff *skb)
> -{
> -	if (atomic_dec_and_test(&skb->users)) {
> -		struct softnet_data *sd;
> -		unsigned long flags;
> -
> -		local_irq_save(flags);
> -		sd = &__get_cpu_var(softnet_data);
> -		skb->next = sd->completion_queue;
> -		sd->completion_queue = skb;
> -		raise_softirq_irqoff(NET_TX_SOFTIRQ);
> -		local_irq_restore(flags);
> -	}
> -}
> +extern void dev_kfree_skb_irq(struct sk_buff *skb);

Maybe you should only move the slowpath out of line ala:

static inline void dev_kfree_skb_irq(struct sk_buff *skb)
{
	if (atomic_dec_and_test(&skb->users)) 
		__dev_kfree_skb_irq(skb);
}

-
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