netdev - Re: [net-next PATCH v2 1/3] net: create generic bridge ops

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Date:	Fri, 2 Nov 2012 22:32:55 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	John Fastabend <john.r.fastabend@...el.com>
CC:	<shemminger@...tta.com>, <buytenh@...tstofly.org>,
	<davem@...emloft.net>, <vyasevic@...hat.com>, <jhs@...atatu.com>,
	<chrisw@...hat.com>, <krkumar2@...ibm.com>, <samudrala@...ibm.com>,
	<peter.p.waskiewicz.jr@...el.com>, <jeffrey.t.kirsher@...el.com>,
	<netdev@...r.kernel.org>, <gregory.v.rose@...el.com>,
	<eilong@...adcom.com>
Subject: Re: [net-next PATCH v2 1/3] net: create generic bridge ops

On Wed, 2012-10-24 at 11:12 -0700, John Fastabend wrote:
> The PF_BRIDGE:RTM_{GET|SET}LINK nlmsg family and type are
> currently embedded in the ./net/bridge module. This prohibits
> them from being used by other bridging devices. One example
> of this being hardware that has embedded bridging components.
> 
> In order to use these nlmsg types more generically this patch
> adds two net_device_ops hooks. One to set link bridge attributes
> and another to dump the current bride attributes.
> 
> 	ndo_bridge_setlink()
> 	ndo_bridge_getlink()
[...]

Do you have any userland code for this?

[...]
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2252,6 +2252,83 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
>  	return skb->len;
>  }
>  
> +static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
> +{
> +	struct net *net = sock_net(skb->sk);
> +	struct net_device *dev;
> +	int idx = 0;
> +	u32 portid = NETLINK_CB(cb->skb).portid;
> +	u32 seq = cb->nlh->nlmsg_seq;
> +
> +	rcu_read_lock();
> +	for_each_netdev_rcu(net, dev) {
> +		const struct net_device_ops *ops = dev->netdev_ops;
> +		struct net_device *master = dev->master;
> +
> +		if (idx < cb->args[0])
> +			continue;
[...]

This is wrong, as idx will not be incremented and continued iteration
won't work at all.  Since this has already been applied, I'll send a
patch for this.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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