Re: [PATCH wpan-next v2 2/6] net: ieee802154: Ensure only FFDs can become PAN coordinators

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Alex,

aahringo@redhat.com wrote on Sun, 19 Jun 2022 20:24:48 -0400:

> Hi,
> 
> On Fri, Jun 17, 2022 at 3:35 PM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> >
> > This is a limitation clearly listed in the specification. Now that we
> > have device types,let's ensure that only FFDs can become PAN
> > coordinators.
> >
> > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > ---
> >  net/ieee802154/nl802154.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> > index 638bf544f102..0c6fc3385320 100644
> > --- a/net/ieee802154/nl802154.c
> > +++ b/net/ieee802154/nl802154.c
> > @@ -924,6 +924,9 @@ static int nl802154_new_interface(struct sk_buff *skb, struct genl_info *info)
> >                         return -EINVAL;
> >         }
> >
> > +       if (type == NL802154_IFTYPE_COORD && !cfg802154_is_ffd(rdev))
> > +               return -EINVAL;
> > +  
> 
> Look at my other mail regarding why the user needs to set this device
> capability, change the errno to "EOPNOTSUPP"... it would be nice to
> have an identically nl80211 handling like nl80211 to see which
> interfaces are supported. Please look how wireless is doing that and
> probably we should not take the standard about those "wording" too
> seriously. What I mean is that according to FFD or RFD it's implied on
> what interfaces you can create on.

This is true, I don't need this _is_ffd() helper, checking on the type
of interface should be enough. I will drop the DEV(PHY)_TYPE enum
entirely.

Thanks,
Miquèl