netdev - Re: [PATCH net-next v2] packet: tx timestamping on tpacket ring

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Date:	Sat, 20 Apr 2013 18:43:59 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Willem de Bruijn <willemb@...gle.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, paul.chavent@...ra.fr,
	daniel.borkmann@....ee.ethz.ch
Subject: Re: [PATCH net-next v2] packet: tx timestamping on tpacket ring

On Fri, Apr 19, 2013 at 05:51:57PM -0400, Willem de Bruijn wrote:

> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 898cf5c..af9185d 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -3327,12 +3327,8 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
>  	if (!sk)
>  		return;
>  
> -	skb = skb_clone(orig_skb, GFP_ATOMIC);
> -	if (!skb)
> -		return;
> -
>  	if (hwtstamps) {
> -		*skb_hwtstamps(skb) =
> +		*skb_hwtstamps(orig_skb) =
>  			*hwtstamps;

And how does *hwtstamps get into the clone?

>  	} else {
>  		/*
> @@ -3340,9 +3336,13 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
>  		 * so keep the shared tx_flags and only
>  		 * store software time stamp
>  		 */
> -		skb->tstamp = ktime_get_real();
> +		orig_skb->tstamp = ktime_get_real();
>  	}
>  
> +	skb = skb_clone(orig_skb, GFP_ATOMIC);
> +	if (!skb)
> +		return;
> +
>  	serr = SKB_EXT_ERR(skb);
>  	memset(serr, 0, sizeof(*serr));
>  	serr->ee.ee_errno = ENOMSG;

Thanks,
Richard
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