On 3/15/17 11:04 AM, Rick Stevens wrote:
On 03/14/2017 02:27 PM, Stephen Morris wrote:
On 3/15/17 3:25 AM, Tom Horsley wrote:
On Tue, 14 Mar 2017 09:43:45 -0700
Rick Stevens wrote:
Like I said, it's damned difficult to come up with something. If you
have a better idea, then submit it to the various kernel groups.
I do have a better idea: Go back to the way it was when you could
use udev to permanently assign names to interfaces :-).
As you have just shown it is impossible to get it "right" but
before they "fixed" it, you could at least get it to remain
consistent with the udev rules.
Stop trying to solve impossible problems.
I have several questions around the naming convention.
My usb wireless adapter is named wlp3s0u2, hence the naming convention
is saying the adapter is usb device 3. I do have 3 usb devices
connected. Two of the devices are usb 2 and the adapter is usb 3, hence
when the device enumeration is done to determine what exists, what
controls whether usb 2 devices are enumerated first , is it software or
the motherboard?
Remember, we're talking about network interfaces here and the naming
conventions we've been discussing here ONLY affects network interfaces.
So am I. I thought the naming convention of 'u2' indicated that the wifi
adapter was the third usb device (which makes sense because I do have 3
usb devices plugged in to the machine) hence what determined the adapter
was the third usb device, given that I would have thought the usb 3
interfaces would have been polled for device discovery before the usb 2
interfaces. But having said this the fact that the device name changed
to 'u1' when I plugged the device into the other cable connected usb 3
slot indicates that the 'u' part of the name is the usb slot number not
the device number.
Assuming the naming convention is based on enumeration
which it may not be given that, I have 2 usb 3 slots on the front of my
machine and, if on the running system I unplug my wireless adapter and
plug it into the second slot, when the system recognizes the device
again the name changes to wlp3s0u1. Also I have 2 usb 2 slots on the
front of my machine, and if I do the same thing to my adapter and unplug
it from the usb 3 slot and plug it into the second usb 2 slot the name
changes to wlp0s19f2u3, hence what does the naming convention actually
represent?
I'm not sure. It sounds like all the USB hubs in your machine interface
through PCI slot 3. I would have expected that the various hubs would
have different "s" numbers (e.g. one hub on p3s0, one on p3s1, etc.).
What you expected to be the situation is the case between the usb 2 and
usb 3 ports, they are on different pci slots, at least according to the
naming convention. But what I don't understand is why the vastly
different name when the device is plugged into a usb 2 slot, I would
have expected the name to be wlp0s19u3. I fully understand that a usb 3
device plugged into a usb 2 port is going to lose functionality, but why
does the naming convention need to specify that, and what functionality
does the 'f2' indicate is being provided by the device?
As I said above I have 3 usb devices, the other 2 are a keyboard and the
transmitter for my wireless mouse. How do I find what the naming
convention for those two devices is, in terms of what they are actually
named?
They'd show up in the dmesg log, but they will NOT be named things like
"wlp3". Again, that's just for wireless NICs. I have a Logitech wireless
keyboard and mouse and this is how they appear in dmesg:
[ 2.556799] logitech 0003:046D:C517.0001: input,hidraw1: USB HID
v1.10 Keyboard [Logitech USB Receiver] on usb-0000:00:14.0-5/input0
[ 2.608866] logitech 0003:046D:C517.0002: input,hiddev0,hidraw2: USB
HID v1.10 Mouse [Logitech USB Receiver] on usb-0000:00:14.0-5/input1
Lastly, if I plug a flash driver into the usb 3 slot where my wireless
adapter was what name does it inherit and how do I find out?
It would most likely be /dev/sdX, where "X" was the next sequential disk
number available at the time you plugged the device in.
I was under the impression from other responses to this thread that all
devices had a standard naming convention, which I thought was similar to
the network device naming convention, hence, if my impression was
correct, what is that naming convention for other devices?
This also leads me down another path, if I plug into my machine my flash
disk, my digital SLR camera and my digital video camera, the flask disk
is auto mounted under /media and the other two are auto mounted under
/run, why are they all not mounted under /media or /run, and, what
determines where they will be mounted and what is different between them
that causes them to be mounted differently?
I also apologize for all the questions, I'm just trying to understand
how the distribution works under the covers so that I can better manage
my system.
regards,
Steve
regards,
Steve
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