netdev - Re: [net-next-2.6 PATCH 02/10] ethtool: add ntuple flow specifier to network flow classifier

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Date:	Sat, 26 Feb 2011 16:05:47 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	alexander.h.duyck@...el.com
Cc:	jeffrey.t.kirsher@...el.com, bhutchings@...arflare.com,
	netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH 02/10] ethtool: add ntuple flow specifier
 to network flow classifier

From: Alexander Duyck <alexander.h.duyck@...el.com>
Date: Fri, 25 Feb 2011 15:32:49 -0800

> @@ -396,8 +411,10 @@ struct ethtool_rx_flow_spec {
>  		struct ethtool_ah_espip4_spec		esp_ip4_spec;
>  		struct ethtool_usrip4_spec		usr_ip4_spec;
>  		struct ethhdr				ether_spec;
> +		struct ethtool_ntuple_spec_ext		ntuple_spec;
>  		__u8					hdata[72];
>  	} h_u, m_u;
> +	__u32		flow_type_ext;
>  	__u64		ring_cookie;
>  	__u32		location;
>  };

How can you add this flow_type_ext member to this user visible structure
without utterly breaking userspace?  It changes the offsets of the
ring_cookie and location members.

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