netdev - Re: [PATCH 04/12] phylib: add a way to make PHY time stamps possible.

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Date:	Wed, 16 Jun 2010 08:29:40 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	netdev@...r.kernel.org
Cc:	linuxppc-dev@...ts.ozlabs.org, devicetree-discuss@...ts.ozlabs.org,
	Krzysztof Halasa <khc@...waw.pl>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 04/12] phylib: add a way to make PHY time stamps
 possible.

On Tue, Jun 15, 2010 at 06:08:20PM +0200, Richard Cochran wrote:

> +static inline void skb_tx_timetamp(struct phy_device *phy, struct sk_buff *skb)
> +{
> +	union skb_shared_tx *shtx = skb_tx(skb);
> +
> +	if (shtx->hardware && phy && phy->drv->txtstamp)
> +		phy->drv->txtstamp(phy, skb);
> +
> +	if (shtx->software && !shtx->in_progress)
> +		skb_tstamp_tx(skb, NULL);
> +}

I forgot to mention this patch also provides a way to fix the broken
software timestamp fallback mode of the SO_TIMESTAMPING API.

We would have to add this inline call to every MAC driver in an
appropriate spot within the hard_xmit function. It is not too pretty,
but providing this as a compile time option will promote
standardization of the SO_TIMESTAMPING API for applications.

Richard
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