linux-kernel - Re: [RFC] usbnet: use eth%d name for known ethernet devices

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Date:	Thu, 24 Mar 2011 00:01:18 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Steve Calfee <stevecalfee@...il.com>
Cc:	Michal Nazarewicz <mnazarewicz@...il.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnd Bergmann <arnd@...db.de>,
	broonie@...nsource.wolfsonmicro.com,
	lkml <linux-kernel@...r.kernel.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Greg KH <greg@...ah.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, grant.likely@...retlab.ca,
	Linux USB list <linux-usb@...r.kernel.org>,
	andy.green@...aro.org, netdev@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	roger.quadros@...ia.com,
	Jaswinder Singh <jaswinder.singh@...aro.org>
Subject: Re: [RFC] usbnet: use eth%d name for known ethernet devices

On Wed, 2011-03-23 at 16:38 -0700, Steve Calfee wrote:
> On 03/23/11 16:17, Michal Nazarewicz wrote:
> >>>>>>> @@ -97,6 +97,8 @@ struct driver_info {
> >>>>>>>
> >>>>>>>   #define FLAG_LINK_INTR       0x0800          /* updates link (carrier) status */
> >>>>>>>
> >>>>>>> +#define FLAG_PTP     0x1000          /* maybe use "usb%d" names */
> >
> >>>>> On Wednesday 23 March 2011 19:46:50 Greg KH wrote:
> >>>>>> "PTP"?  What does that stand for?
> >
> >>>> On Mar 23, 2011 8:36 PM, "Arnd Bergmann"<arnd@...db.de>  wrote:
> >>>>> point-to-point, I'll improve the comment to spell it out when
> >>>>> I send the fixed version.
> >
> >>> On Wednesday 23 March 2011 20:53:13 Michał Nazarewicz wrote:
> >>>> I think P2P could be better.
> >
> >> On Wed, 23 Mar 2011 20:57:18 +0100 Arnd Bergmann wrote:
> >>> Yes, good idea.
> >
> > Randy Dunlap<rdunlap@...otime.net>  writes:
> >> that's peer-to-peer.
> >>
> >> OTOH, I knew that PTP was point-to-point.
> >
> > It can be any of that, depending on context.  For me PTP is more like
> > Picture Transport Protocol, whereas "2" between two letters is usually
> > "to".
> >
> Well, my 2 cents, picture transport protocol is so obviously different 
> than flags for network interfaces it does not cause a mental collision. 

PTP is also Precision Time Protocol, which *is* used on network
interfaces (maybe not USB-connected interfaces though).

Anyway, these USB cable interfaces can presumably be bridged to standard
Ethernet, so they are really no more point-to-point than any other
Ethernet link has been since the demise of the hub.

> However P2P is about to become a huge wifi issue, which definitely is in 
> the network space. So don't confuse things in the near future, don't use 
> P2P.
>
> Maybe a completely different, not so overused flag name would be better.

How about FLAG_NON_IEEE, meaning that the physical layer is not based on
an IEEE 802.3, 802.11 or other standard physical layer.

Ben.

-- 
Ben Hutchings, Senior Software 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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