netdev - Re: [PATCH] compat-wireless: updates for orinoco

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Message-ID: <20100505001830.GO2624@tux>
Date:	Tue, 4 May 2010 17:18:30 -0700
From:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	David Miller <davem@...emloft.net>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"mcgrof@...nel.org" <mcgrof@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] compat-wireless: updates for orinoco

On Tue, May 04, 2010 at 05:04:09PM -0700, Stephen Hemminger wrote:
> On Tue, 4 May 2010 16:26:53 -0700
> "Luis R. Rodriguez" <lrodriguez@...eros.com> wrote:
> 
> > First of all, thanks a lot! Some comments below.
> > 
> > On Tue, May 4, 2010 at 3:40 PM, Hauke Mehrtens <hauke@...ke-m.de> wrote:
> > > * Make all the patches apply again.
> > > * rename read_pda to avoid conflicts with definitions in kernel <= 2.6.29
> > 
> > I'm going to apply these two changes, if you get time can you send a
> > patch to rename read_pda upstream as well, that way we don't have to
> > carry this?
> > 
> > > * add orinoco usb
> > 
> > Thanks for this but I've grown tired of updating these netdev ops and
> > I think we can do better. I'll add a netdev_attach_ops() which would
> > simply do all the backport stuff for us, this way for backporting
> > purposes all we have to do is replace the old lines with a
> > netdev_attach_ops() call. In fact if we *really* wanted to we could
> > add a dummy netdev_attach_ops() upstream and just backport that on
> > older kernels, this would mean 0 line changes to backport a newer
> > driver.
> > 
> > Something like this maybe on the generic compat module, it builds for
> > me, will commit soon.
> > 
> > /*
> >  * Expand this as drivers require more ops, for now this
> >  * only sets the ones we need.
> >  */
> > void netdev_attach_ops(struct net_device *dev,
> >                       const struct net_device_ops *ops)
> > {
> > #define SET_NETDEVOP(_op) (_op ? _op : NULL)
> >        dev->open = SET_NETDEVOP(ops->ndo_open);
> >        dev->stop = SET_NETDEVOP(ops->ndo_stop);
> >        dev->hard_start_xmit = SET_NETDEVOP(ops->ndo_start_xmit);
> >        dev->set_multicast_list = SET_NETDEVOP(ops->ndo_set_multicast_list);
> >        dev->change_mtu = SET_NETDEVOP(ops->ndo_change_mtu);
> >        dev->set_mac_address = SET_NETDEVOP(ops->ndo_set_mac_address);
> >        dev->tx_timeout = SET_NETDEVOP(ops->ndo_tx_timeout);
> >        dev->get_stats = SET_NETDEVOP(ops->ndo_get_stats);
> > #undef SET_NETDEVOP
> > }
> > EXPORT_SYMBOL(netdev_attach_ops);
> > 
> > For newer kernels then this would just be:
> > 
> > static inline void netdev_attach_ops(struct net_device *dev,
> >                       const struct net_device_ops *ops)
> > {
> >        dev->netdev_ops = ops;
> > }
> > 
> > Stephen, would the above be acceptable upstream on netdevice.h ? It
> > would eliminate all needs from having to #ifdef network drivers when
> > backporting. If so I can send a respective patch and spatch all the
> > setters I think. An example of the nasty ifdef crap we have to do for
> > the current backport of netdevop'able drivers is below.
> > 
> 
> No. supporting backporting is not part of the upstream kernel
> mission. Honestly, we try for forward compatibility but intentionally
> ignore carrying extra backport baggage.

Sure, understood, just had to try :), if only I could find a *good*
non-backport reason to have the netdev_attach_ops()...

  Luis
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