netdev - Re: [RFC PATCH net-next 1/3] net: switchdev: extract switchdev_obj

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Message-ID: <20150908205841.GF29184@lunn.ch>
Date:	Tue, 8 Sep 2015 22:58:41 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
	Scott Feldman <sfeldma@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	kernel@...oirfairelinux.com
Subject: Re: [RFC PATCH net-next 1/3] net: switchdev: extract
 switchdev_obj_vlan

> +/* SWITCHDEV_OBJ_PORT_VLAN */
> +struct switchdev_obj_vlan {
> +	struct switchdev_obj obj;	/* must be first */
> +	u16 flags;
> +	u16 vid_begin;
> +	u16 vid_end;
> +};

I know you give a few examples for where this is done in network code,
but i think container_of() is used much more. You can then place the
struct switchdev_obj anywhere in the structure, and it will work.

#define to_switchdev_obj_vlan(o) container_of(o, struct switchdev_obj_vlan, obj)

	Andrew
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