netdev - Re: [PATCH net-next V3 3/5] net/mlx4_en: Add HW timestamping (TS) support

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Message-ID: <20130425192627.GA14429@netboy>
Date:	Thu, 25 Apr 2013 21:26:27 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>
Subject: Re: [PATCH net-next V3 3/5] net/mlx4_en: Add HW timestamping (TS)
 support

On Tue, Apr 23, 2013 at 07:06:49PM +0300, Amir Vadai wrote:

> +u64 mlx4_en_get_cqe_ts(struct mlx4_cqe *cqe)
> +{
> +	u64 hi, lo;
> +	struct mlx4_ts_cqe *ts_cqe = (struct mlx4_ts_cqe *)cqe;
> +
> +	lo = (u64)be16_to_cpu(ts_cqe->timestamp_lo);
> +	hi = ((u64)be32_to_cpu(ts_cqe->timestamp_hi) + !lo) << 16;
                                                     ^^^^^
That looks a bit strange. Can you explain?

> +
> +	return hi | lo;
> +}

Thanks,
Richard
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