netdev - Re: [PATCH V3 10/11] mv643xx_eth: enable transmit time stamping.

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Date:	Mon, 20 Jun 2011 18:35:24 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH V3 10/11] mv643xx_eth: enable transmit time stamping.

On Mon, Jun 20, 2011 at 09:51:32AM +0200, Richard Cochran wrote:

> This patch enables software (and phy device) transmit time stamping.
> Compile tested only.
> 
> Cc: Lennert Buytenhek <buytenh@...tstofly.org>
> Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
> ---
>  drivers/net/mv643xx_eth.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
> index 1b7d2c1..3671714 100644
> --- a/drivers/net/mv643xx_eth.c
> +++ b/drivers/net/mv643xx_eth.c
> @@ -847,6 +847,8 @@ no_csum:
>  	/* clear TX_END status */
>  	mp->work_tx_end &= ~(1 << txq->index);
>  
> +	skb_tx_timestamp(skb);
> +
>  	/* ensure all descriptors are written before poking hardware */
>  	wmb();
>  	txq_enable(txq);

This only timestamps the skb _after_ writing the final (cmd_sts) HW TX
descriptor word, and so if your previous patch is correct (which I don't
think it is), this would be buggy as well.
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