netdev - Re: [PATCH 09/39] wimax: provides user space with information needed when opening a WiMAX device

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Date:	Thu, 27 Nov 2008 13:20:25 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Inaky Perez-Gonzalez <inaky@...ux.intel.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 09/39] wimax: provides user space with information
	needed when opening a WiMAX device

On Thu, 2008-11-27 at 10:54 +0100, Johannes Berg wrote:

> > +	result = -ENOMEM;
> > +	reply_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> > +	if (reply_skb == NULL)
> > +		goto error_new;
> > +	data = genlmsg_put_reply(reply_skb, genl_info,
> > +				 &wimax_dev->gnl_family,
> > +				 0, WIMAX_GNL_RP_IFINFO);
> > +	if (data == NULL)
> > +		goto error_put_reply;
> > +
> > +	nla_groups = nla_nest_start(reply_skb, WIMAX_GNL_IFINFO_MC_GROUPS);
> > +	if (nla_groups == NULL)
> > +		goto error_groups_start;
> > +
> > +	list_for_each_entry(pipe_itr, &wimax_dev->pipe_list,
> > +			    list_node) {
> > +		nla_group = nla_nest_start(reply_skb,
> > +					   WIMAX_GNL_IFINFO_MC_GROUP);
> > +		if (nla_group == NULL)
> > +			goto error_group_start;
> > +
> > +		nla_put_u16(reply_skb, WIMAX_GNL_IFINFO_MC_ID,
> > +			    pipe_itr->mcg.id);
> > +		nla_put_string(reply_skb, WIMAX_GNL_IFINFO_MC_NAME,
> > +			       pipe_itr->mcg.name);
> 
> All this is discoverable via the genl controller and a pipe naming
> scheme, so I don't think you need this "open" command at all.

In fact, it's entirely trivial since you use a genl family for each
interface, thus you just have to ask the genl controller for the groups
associated with that family. If you need sample code, check out iw.

johannes

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