netdev - Re: [PATCH net-next,v3 09/12] flow_dissector: add basic ethtool_rx_flow_spec to flow

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Date:   Wed, 21 Nov 2018 20:59:27 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, thomas.lendacky@....com,
        ariel.elior@...ium.com, michael.chan@...adcom.com,
        santosh@...lsio.com, madalin.bucur@....com,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        jeffrey.t.kirsher@...el.com, tariqt@...lanox.com,
        saeedm@...lanox.com, jiri@...lanox.com, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, peppe.cavallaro@...com,
        grygorii.strashko@...com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, alexandre.torgue@...com,
        joabreu@...opsys.com, linux-net-drivers@...arflare.com,
        ganeshgr@...lsio.com, ogerlitz@...lanox.com,
        Manish.Chopra@...ium.com
Subject: Re: [PATCH net-next,v3 09/12] flow_dissector: add basic
 ethtool_rx_flow_spec to flow_rule structure translator



On 11/20/2018 6:51 PM, Pablo Neira Ayuso wrote:
> This patch adds a function to translate the ethtool_rx_flow_spec
> structure to the flow_rule representation.
> 
> This allows us to reuse code from the driver side given that both flower
> and ethtool_rx_flow interfaces use the same representation.
> 
> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> ---
> v3: Suggested by Jiri Pirko:
>         - Add struct ethtool_rx_flow_rule, keep placeholder to private
>           dissector information.
>     Reported by Manish Chopra:
> 	- Fix incorrect dissector user_keys flags.
> 
>  include/linux/ethtool.h |  10 +++
>  net/core/ethtool.c      | 189 ++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 199 insertions(+)
> 
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index afd9596ce636..99849e0858b2 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -400,4 +400,14 @@ struct ethtool_ops {
>  	void	(*get_ethtool_phy_stats)(struct net_device *,
>  					 struct ethtool_stats *, u64 *);
>  };
> +
> +struct ethtool_rx_flow_rule {
> +	struct flow_rule	*rule;
> +	unsigned long		priv[0];

This forces you to cast to/from that member, any reason this is just not
a void *priv here?
-- 
Florian