netdev - Re: skb->timestamp == 0.000000 ?

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Message-ID: <20111121211140.GB24753@d2.suse.de>
Date:	Mon, 21 Nov 2011 16:11:40 -0500
From:	Benjamin Poirier <benjamin.poirier@...il.com>
To:	Felipe Dias <felipediassss@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: skb->timestamp == 0.000000 ?

On 11/11/19 18:13, Felipe Dias wrote:
> Hi..
> 
> Please let me know if this isnt right list to this kind of question.
> 
> I'm registering a new protocol handler with dev_add_pack. I would like
> to know only the difference between timestamp on skb->tstamp and the
> time of reception by my module.
> 
> So I do:
> ----
> struct timeval time_skb, time_module;
> do_gettimeofday(&time_module):
> skb_get_timestamp(skb, &time_skb);
> ---
> 
> And time_skb.tv_sec and time_skb.tv_usec are equal to 0;
> 
> I'm doing some wrong ?

Timestamps have to be enabled
have a look at:
net_enable_timestamp()

-Ben
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