linux-kernel - Re: [RFC 2/4] cfg80211: Add new interface type for OCB mode

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Date:	Tue, 03 Jun 2014 22:10:44 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Rostislav Lisovy <lisovy@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Sojka <sojkam1@....cvut.cz>, s.sander@...dsys.de,
	jan-niklas.meier@...kswagen.de,
	Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
Subject: Re: [RFC 2/4] cfg80211: Add new interface type for OCB mode

On Fri, 2014-05-30 at 18:56 +0200, Rostislav Lisovy wrote:
> Add new OCB mode (outside the context of the BSS) interface
> type as well as functions necessary to configure the interface
> when 'joining' such network.

I think you also want some API to leave (stop operating in) the network
again, and call that appropriately (e.g. on ifdown) and allow userspace
to call it.

> +struct ocb_setup {
> +	struct cfg80211_chan_def chandef;
> +	u32 basic_rates;
> +};

The channel seems obvious - but basic rates? Wouldn't OCB always just
use a single rate, basically? Certainly not *basic* rates (which are
required to be implemented for joining the BSS) since there is no BSS?

> +	if (!setup->chandef.chan)
> +		WARN_ON(!setup->chandef.chan);

That makes very little sense to me?

> @@ -892,6 +893,7 @@ cfg80211_get_chan_state(struct wireless_dev *wdev,
>                                 *radar_detect |=
> BIT(wdev->chandef.width);
>                 }
>                 return;
> +       case NL80211_IFTYPE_OCB:
>         case NL80211_IFTYPE_MONITOR:
>         case NL80211_IFTYPE_AP_VLAN:
>         case NL80211_IFTYPE_WDS:

That certainly doesn't seem correct, in particular if you consider the
comment that's two lines down.

        case NL80211_IFTYPE_P2P_DEVICE:
                /* these interface types don't really have a channel
*/   

It seems for OCB you need some indication that it's joined (maybe the
channel being non-NULL could do?) and then treat it here correctly has
having an exclusive lock on the channel.

johannes

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