On 13.03.2017 21:37, Stephen Morris wrote:
[...]
> In fact, for me, Fedora's naming convention raises more questions than
> it answers. Without knowing anything about the internal hardware design
> of a motherboard, how is a usb port on a pci bus, I would expect pci
> ports to be on a pci bus and usb ports to be on a usb bus, and relative
> to usb ports I would expect there to be a separate bus for usb 2 and usb
> 3 ports.
[...]
Hello Zbigniew,
would you mind to further explain the naming scheme?
I show an example;
dmesg -t | grep wl -m1
r92su 1-3:1.0 wlp0s2f1u3: renamed from wlan0
wlp0s2f1u3
wl p0 s2 f1 u3
wl-wlan p-bus=0 s-slot=2 f-function=1 u-port=3
lsusb
Bus 001 Device 003: ...
lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
|__ Port 3: Dev 3, If 0, Class=Vendor Specific Class, Driver=r92su, 480M
ls /sys/devices/pci0000:00/0000:00:02.1/usb1/1-3/1-3:1.0/net/
wlp0s2f1u3
lspci -d ::0c03
00:02.1 USB controller: ...
00 02 1
<bus>:<device>.<func>
udevadm info -q env /sys/class/net/wlp0s2f1u3 | grep PATH
DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-3/1-3:1.0/net/wlp0s2f1u3
ID_NET_NAME_PATH=wlp0s2f1u3
ID_PATH=pci-0000:00:02.1-usb-0:3:1.0
ID_PATH_TAG=pci-0000_00_02_1-usb-0_3_1_0
udevadm info -a -p /sys/class/net/wlp0s2f1u3 | grep looking -A 3
looking at device
'/devices/pci0000:00/0000:00:02.1/usb1/1-3/1-3:1.0/net/wlp0s2f1u3':
KERNEL=="wlp0s2f1u3"
SUBSYSTEM=="net"
DRIVER==""
--
looking at parent device '/devices/pci0000:00/0000:00:02.1/usb1/1-3/1-3:1.0':
KERNELS=="1-3:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="r92su"
--
looking at parent device '/devices/pci0000:00/0000:00:02.1/usb1/1-3':
KERNELS=="1-3"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
--
looking at parent device '/devices/pci0000:00/0000:00:02.1/usb1':
KERNELS=="usb1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
--
looking at parent device '/devices/pci0000:00/0000:00:02.1':
KERNELS=="0000:00:02.1"
SUBSYSTEMS=="pci"
DRIVERS=="ehci-pci"
--
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
Ref.
https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames
https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L46
* [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
* — USB port number chain
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