netdev - Re: [PATCH net-next 2/2] igb: offer a PTP Hardware Clock instead of the timecompare method

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Message-ID: <20111225153227.GB2581@netboy.at.omicron.at>
Date:	Sun, 25 Dec 2011 16:32:28 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	netdev@...r.kernel.org
Cc:	e1000-devel@...ts.sourceforge.net,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net-next 2/2] igb: offer a PTP Hardware Clock instead
 of the timecompare method

On Tue, Dec 13, 2011 at 04:00:35AM +0100, Richard Cochran wrote:
> +void igb_systim_to_hwtstamp(struct igb_adapter *adapter,
> +			    struct skb_shared_hwtstamps *hwtstamps,
> +			    u64 systim)
> +{
> +	u64 ns;
> +	unsigned long flags;
> +	unsigned int shift;
> +	int msb_set;
> +
> +	switch (adapter->hw.mac.type) {
> +	case e1000_i350:
> +	case e1000_82580:
> +		shift = OFL_SHIFT_82580;
> +		msb_set = (systim >> 32) & SYSTIMH_MSB_82580;
> +		break;
> +	case e1000_82576:
> +		shift = OFL_SHIFT_82576;
> +		msb_set = (systim >> 32) & SYSTIMH_MSB_82576;

Should have converted systim to nanoseconds here.

> +		break;
> +	default:
> +		return;
> +	}
> +
> +	spin_lock_irqsave(&adapter->tmreg_lock, flags);
> +
> +	ns = igb_overflow_get(adapter, systim, msb_set, shift);
> +
> +	spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
> +
> +	memset(hwtstamps, 0, sizeof(*hwtstamps));
> +	hwtstamps->hwtstamp = ns_to_ktime(ns);
> +}
> -- 
> 1.7.2.5
> 
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