netdev - Re: [PATCH v4] ethtool: Add direct access to ops->get_sset

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Message-ID: <1267712797.2819.149.camel@localhost>
Date:	Thu, 04 Mar 2010 14:26:37 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, jeff@...zik.org, netdev@...r.kernel.org,
	gospo@...hat.com
Subject: Re: [PATCH v4] ethtool: Add direct access to ops->get_sset_count

On Thu, 2010-03-04 at 00:51 -0800, Jeff Kirsher wrote:
> From: Jeff Garzik <jgarzik@...hat.com>
> 
> This patch is an alternative approach for accessing string
> counts, vs. the drvinfo indirect approach.  This way the drvinfo
> space doesn't run out, and we don't break ABI later.
[...]
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -214,6 +214,10 @@ static noinline int ethtool_get_drvinfo(struct net_device *dev, void __user *use
>  	info.cmd = ETHTOOL_GDRVINFO;
>  	ops->get_drvinfo(dev, &info);
>  
> +	/*
> +	 * this method of obtaining string set info is deprecated;
> +	 * consider using ETHTOOL_GSSET_INFO instead
> +	 */

This comment belongs on the interface (ethtool.h) not the
implementation.

[...]
> +static noinline int ethtool_get_sset_info(struct net_device *dev,
> +                                          void __user *useraddr)
> +{
[...]
> +	/* calculate size of return buffer */
> +	for (i = 0; i < 64; i++)
> +		if (sset_mask & (1ULL << i))
> +			n_bits++;
[...]

We have a function for this:

	n_bits = hweight64(sset_mask);

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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