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Proxmox V7 for Raspberry Pi
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LXC USB Passthrough (CC2531 Zigbee Stick) #47

Closed mietzen closed 2 years ago

mietzen commented 2 years ago

I followed this guide: https://forum.proxmox.com/threads/lxc-usb-passthrough-zwave-stick.30058/

On the Host the device shows up:

# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0451:16a8 Texas Instruments, Inc. CC2531 ZigBee
Bus 001 Device 002: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

# ls -al /dev/bus/usb/001/004
crw-rw-r-- 1 root root 189, 3 Jan  2 16:21 /dev/bus/usb/001/004

ls -al /dev/ttyACM0
crw-rw---- 1 root dialout 166, 0 Jan  2 16:21 /dev/ttyACM0

so I added 

lxc.cgroup.devices.allow: c 189:* rwm
lxc.mount.entry: /dev/bus/usb/001/004 dev/bus/usb/001/004 none bind,optional,create=dir
lxc.cgroup.devices.allow: c 166:* rwm
lxc.mount.entry: /dev/ttyACM0 dev/ttyACM0 none bind,optional,create=file

to the config.

But in the container i get Error: Operation not permitted, cannot open /dev/ttyACM0, I've created dailout, used root, chmod 777 on /dev/ttyACM0 and privileged container. But the USB Device is shown by lsusb inside the container.

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0451:16a8 Texas Instruments, Inc. CC2531 ZigBee
Bus 001 Device 002: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

When I try to add the device with lxc-device I get:

lxc-device add -n 100 /dev/ttyACM0 /dev/ttyACM0
lxc-device: 100: commands.c: lxc_cmd_add_bpf_device_cgroup: 1399 Operation not permitted - Failed to add new bpf device cgroup rule
lxc-device: 100: lxccontainer.c: add_remove_device_node: 4659 set_cgroup_item failed while adding the device node
lxc-device: 100: tools/lxc_device.c: main: 153 Failed to add /dev/ttyACM0 to 100

Could it be that the Kernel is missing a feature or something?

Edit: It should theoretically be possible to passthrough a tty with lxc on a raspberry pi: https://doc.turris.cz/doc/en/public/deconz_lxc_howto (Other os, other stick)

I also tried a USB to UART Stick, with the same result: /dev/ttyUSB0: Operation not permitted

mietzen commented 2 years ago

Found the failure, you have to use a unprivileged container! Then USB Passthrough is working fine 👍