netdev - Re: [RFC] net : add tx timestamp to packet mmap.

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Date:	Thu, 13 Dec 2012 14:29:16 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Paul Chavent <Paul.Chavent@...ra.fr>
Cc:	davem@...emloft.net, edumazet@...gle.com,
	daniel.borkmann@....ee.ethz.ch, xemul@...allels.com,
	ebiederm@...ssion.com, netdev@...r.kernel.org
Subject: Re: [RFC] net : add tx timestamp to packet mmap.

On Wed, Dec 12, 2012 at 04:29:25PM +0100, Paul Chavent wrote:
> This patch allow to generate tx timestamps of packets sent by the packet mmap interface.
> 
> Actually, you can't get tx timestamps with the sample code below.
> 
> I wonder if my current implementation is good. And if not, how should i get the timestamps ?

In order for time stamps to appear, somebody has to call
skb_tx_timestamp() ...

> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> index e639645..948748b 100644
> --- a/net/packet/af_packet.c
> +++ b/net/packet/af_packet.c
> @@ -1857,6 +1857,10 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
>  	void *data;
>  	int err;
>  
> +	err = sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags);

and this call is only setting some flags.

HTH,
Richard
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