netdev - Re: [net-next 04/14] e1000e: add support for IEEE-1588 PTP

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Date:	Thu, 17 Jan 2013 16:35:35 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, Bruce Allan <bruce.w.allan@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com
Subject: Re: [net-next 04/14] e1000e: add support for IEEE-1588 PTP

On Thu, Jan 17, 2013 at 03:35:09AM -0800, Jeff Kirsher wrote:

> +static struct ptp_clock_info e1000e_ptp_clock_info = {
> +	.owner		= THIS_MODULE,

small nit: better to use a static string for .name here than ...

> +	.n_alarm	= 0,
> +	.n_ext_ts	= 0,
> +	.n_per_out	= 0,
> +	.pps		= 0,
> +	.adjfreq	= e1000e_phc_adjfreq,
> +	.adjtime	= e1000e_phc_adjtime,
> +	.gettime	= e1000e_phc_gettime,
> +	.settime	= e1000e_phc_settime,
> +	.enable		= e1000e_phc_enable,
> +};
> +
> +/**
> + * e1000e_ptp_init - initialize PTP for devices which support it
> + * @adapter: board private structure
> + *
> + * This function performs the required steps for enabling PTP support.
> + * If PTP support has already been loaded it simply calls the cyclecounter
> + * init routine and exits.
> + **/
> +void e1000e_ptp_init(struct e1000_adapter *adapter)
> +{
> +	struct e1000_hw *hw = &adapter->hw;
> +
> +	adapter->ptp_clock = NULL;
> +
> +	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))
> +		return;
> +
> +	adapter->ptp_clock_info = e1000e_ptp_clock_info;
> +
> +	snprintf(adapter->ptp_clock_info.name,
> +		 sizeof(adapter->ptp_clock_info.name), "%pm",
> +		 adapter->netdev->perm_addr);

... putting any kind of address here. After some back and forth,
discussing what the 'name' field should be, we decided on

 * @name:      A short "friendly name" to identify the clock and to
 *             help distinguish PHY based devices from MAC based ones.
 *             The string is not meant to be a unique id.

and most other drivers put the name of the driver here.

Other than that, this new driver looks good to me. I'll try it out
soon.

Acked-by: Richard Cochran <richardcochran@...il.com>

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