linux-kernel - Re: [PATCH net-next v2 4/9] net: introduce MACsec ops and add a reference in net

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Date:   Fri, 9 Aug 2019 13:35:09 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Antoine Tenart <antoine.tenart@...tlin.com>
Cc:     davem@...emloft.net, sd@...asysnail.net, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
        alexandre.belloni@...tlin.com, allan.nielsen@...rochip.com,
        camelia.groza@....com, Simon.Edelhaus@...antia.com
Subject: Re: [PATCH net-next v2 4/9] net: introduce MACsec ops and add a
 reference in net_device

On Thu,  8 Aug 2019 16:05:55 +0200, Antoine Tenart wrote:
> This patch introduces MACsec ops for drivers to support offloading
> MACsec operations. A reference to those ops is added in net_device.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
> ---
>  include/linux/netdevice.h | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 88292953aa6f..59ff123d62e3 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -53,6 +53,7 @@ struct netpoll_info;
>  struct device;
>  struct phy_device;
>  struct dsa_port;
> +struct macsec_context;
>  
>  struct sfp_bus;
>  /* 802.11 specific */
> @@ -910,6 +911,29 @@ struct xfrmdev_ops {
>  };
>  #endif
>  
> +#if defined(CONFIG_MACSEC)
> +struct macsec_ops {

I think it'd be cleaner to have macsec_ops declared in macsec.h
and forward declare macsec_ops rather than macsec_context.

> +	/* Device wide */
> +	int (*mdo_dev_open)(struct macsec_context *ctx);
> +	int (*mdo_dev_stop)(struct macsec_context *ctx);
> +	/* SecY */
> +	int (*mdo_add_secy)(struct macsec_context *ctx);
> +	int (*mdo_upd_secy)(struct macsec_context *ctx);
> +	int (*mdo_del_secy)(struct macsec_context *ctx);
> +	/* Security channels */
> +	int (*mdo_add_rxsc)(struct macsec_context *ctx);
> +	int (*mdo_upd_rxsc)(struct macsec_context *ctx);
> +	int (*mdo_del_rxsc)(struct macsec_context *ctx);
> +	/* Security associations */
> +	int (*mdo_add_rxsa)(struct macsec_context *ctx);
> +	int (*mdo_upd_rxsa)(struct macsec_context *ctx);
> +	int (*mdo_del_rxsa)(struct macsec_context *ctx);
> +	int (*mdo_add_txsa)(struct macsec_context *ctx);
> +	int (*mdo_upd_txsa)(struct macsec_context *ctx);
> +	int (*mdo_del_txsa)(struct macsec_context *ctx);
> +};
> +#endif
> +
>  struct dev_ifalias {
>  	struct rcu_head rcuhead;
>  	char ifalias[];
> @@ -1755,6 +1779,8 @@ enum netdev_priv_flags {
>   *
>   *	@wol_enabled:	Wake-on-LAN is enabled
>   *
> + *	@macsec_ops:    MACsec offloading ops
> + *
>   *	FIXME: cleanup struct net_device such that network protocol info
>   *	moves out.
>   */
> @@ -2036,6 +2062,11 @@ struct net_device {
>  	struct lock_class_key	*qdisc_running_key;
>  	bool			proto_down;
>  	unsigned		wol_enabled:1;
> +
> +#if IS_ENABLED(CONFIG_MACSEC)
> +	/* MACsec management functions */
> +	const struct macsec_ops *macsec_ops;
> +#endif
>  };
>  #define to_net_dev(d) container_of(d, struct net_device, dev)
>