netdev - Re: [patch net-next RFC 07/12] dsa: implement ndo_swdev_get

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Message-ID: <1408639089.13073.0.camel@deadeye.wl.decadent.org.uk>
Date:	Thu, 21 Aug 2014 09:38:09 -0700
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, tgraf@...g.ch, dborkman@...hat.com,
	ogerlitz@...lanox.com, jesse@...ira.com, pshelar@...ira.com,
	azhou@...ira.com, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, dev@...nvswitch.org, jasowang@...hat.com,
	ebiederm@...ssion.com, nicolas.dichtel@...nd.com,
	ryazanov.s.a@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, nbd@...nwrt.org, alexei.starovoitov@...il.com,
	Neil.Jerram@...aswitch.com, ronye@...lanox.com
Subject: Re: [patch net-next RFC 07/12] dsa: implement ndo_swdev_get_id

On Thu, 2014-08-21 at 18:19 +0200, Jiri Pirko wrote:
[...]
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -171,6 +171,19 @@ static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
>  	return -EOPNOTSUPP;
>  }
>  
> +static int dsa_slave_swdev_get_id(struct net_device *dev,
> +				  struct netdev_phys_item_id *psid)
> +{
> +	struct dsa_slave_priv *p = netdev_priv(dev);
> +	struct dsa_switch *ds = p->parent;
> +	u64 tmp = (u64) ds;
> +
> +	/* TODO: add more sophisticated id generation */
> +	memcpy(&psid->id, &tmp, sizeof(tmp));
[...]

Right, you must not expose kernel addresses to userland.

Ben.

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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