Actually, I'd say the usb_make_path() physical IDs are not really available through sysfs.
I distinctly recall them being in sysfs *somewhere*; since I'm not booted into 2.5 at the moment, I don't remember the exact location.
Let me know if you find them somewhere. The original notion was that they'd be the sysfs bus_id values. Although sysfs does expose physical paths, their identifiers are not "stable". (Any more than "ethN" identifiers are: they depend on the order in which devices are initialized.)
How exactly would you be "given a USB device"?
Given:
- set of USB network interfaces eth0-eth10 - set of ten USB network devices in /proc/bus/usb
Cross reference them.
That's a different problem ... it's a classic "usbfs doesn't relate to the Real World" problem. I've long thought that "usbfs" just needs (yet) another ioctl to expose the physical path info. But ISTR that Greg has vetoed any more ioctls there.
Why do you want that cross-referencing? Other than the pure intellectual challenge, of course ... :)
(And hmm, how about cross-referencing the "usbfs" and "sysfs" files for the same device?)
This requires using what's returned by GDRVINFO, and if they're all using usb_make_path() in 2.4, this appears to be pretty messy.
No different than in 2.5, as I said.
The GDRVINFO path ID is intended to correspond to things like the ttyNN (or lpN) path IDs: stable until you start re-wiring things, and appropriate to save in config files that know where each given link goes. Not all network links are "ethN", and many don't even have stable Ethernet addresses -- so "nameif" and similar tools can't always help.
Tossing "usbfs" into that mix does point at another problem that's likely worth solving, but it's hard to solve that without fixing "usbfs" to make more device info available.
- Dave
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