netdev - Re: [net-next-2.6 PATCH v2 1/3] ethtool: Introduce n-tuple filter programming support

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Date:	Thu, 04 Feb 2010 09:18:54 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	peter.p.waskiewicz.jr@...el.com
Subject: Re: [net-next-2.6 PATCH v2 1/3] ethtool: Introduce n-tuple filter
 programming support

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Wed, 03 Feb 2010 23:48:13 -0800

> +#define ETHTOOL_RXNTUPLE_ACTION_DROP -1
> +	struct list_head list;
> +};

You can't do this.

You put the list_head here in the kernel header, which BTW can
be used by userspace too, and then you elide it in the
ethtool utility copy of the header.

Use an encapsulator if you must inside of the kernel, but keep the
userspace visible data structure clean of RCU and list_head
kernel datastructures.

Thanks.

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