Do we have complete RNDIS stack available for STM32 controller in zephyr ?

[enthunilu]

Describe the bug
Hi, this is not a bug. I could not find correct option to post this question. So, logging ticket under bug category.

I am looking for integration of RNDIS for my STM32 controller. And I saw RNDIS USB class function available under zephyr subsystem
https://github.com/zephyrproject-rtos/zephyr/tree/main/subsys/usb/device/class/netusb

I am new to this. So, not sure how to understand it and check complete support of RNDIS.
So, I wanted to know does zephyr supports complete stack for RNDIS ?
If yes, where can I get documentation for the same ?
Also, do we have any test environment available to ensure functionality on zephyr ?

My system:
Board: STM32 dev board
Machine: Windows 10

Thanks in advance!!

[carlescufi]

RNDIS is supported over USB in Zephyr: https://github.com/zephyrproject-rtos/zephyr/blob/main/subsys/usb/device/class/netusb/function_rndis.c. This is vendor-independent code so as long as STM32 supports USB (it does) then this should work as well.

[enthunilu]

Hello @carlescufi thanks for your support.
If possible can you please share example code or documentation for USB RNDIS?
I am new to this, so wanted to understand how I can use it.

Thanks!!

[carlescufi]

Hello @carlescufi thanks for your support. If possible can you please share example code or documentation for USB RNDIS? I am new to this, so wanted to understand how I can use it.

Thanks!!

I am sorry, I do not really have any insight there. Perhaps @finikorg knows?

[finikorg]

Hello @carlescufi thanks for your support. If possible can you please share example code or documentation for USB RNDIS? I am new to this, so wanted to understand how I can use it.
Thanks!!

I am sorry, I do not really have any insight there. Perhaps @finikorg knows?

Basically @enthunilu, you can take some networking sample and setup netusb, it can be done with overlay file like: https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/net/sockets/dumb_http_server/overlay-netusb.conf

zephyr/samples/net/sockets/dumb_http_server/overlay-netusb.conf

Lines 1 to 9 in f9739ab

	# USB Device settings
	CONFIG_USB_DEVICE_STACK=y
	# Select USB Configurations
	CONFIG_USB_DEVICE_NETWORK_ECM=y
	# Logging
	CONFIG_USB_DRIVER_LOG_LEVEL_INF=y
	CONFIG_USB_DEVICE_LOG_LEVEL_INF=y

There is also one configuration for RNDIS left for zperf here:

zephyr/samples/net/zperf/sample.yaml

Lines 24 to 30 in f9739ab

	sample.net.zperf.netusb_rndis:
	extra_args: OVERLAY_CONFIG="overlay-netusb.conf"
	extra_configs:
	- CONFIG_USB_DEVICE_NETWORK_ECM=n
	- CONFIG_USB_DEVICE_NETWORK_RNDIS=y
	tags: usb net zperf
	depends_on: usb_device

[enthunilu]

Thank you @carlescufi and @finikorg. This is a great help to start with.

:-)

[enthunilu]

Just wanted to share I am able to test usb-rndis functionality by using below example code and
https://github.com/zephyrproject-rtos/zephyr/tree/f9739ab41dde9c56e3bc038fe0bebf65b5ac1cfa/samples/net/sockets/dumb_http_server

with some minor changes in code.

Thanks again @finikorg for sharing inputs.

[roygedge]

Hey!
I'm experiencing the same difficulties with stm32f411e_disco , I'm trying to compile the echo_server sample with the netusb overlay, however it throws me linking errors such as:

/home/c456913/zephyr-sdk-0.16.3/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd:zephyr/subsys/usb/device/class/netusb/libsubsys__usb__device__class__netusb.a(function_ecm.c.obj): in functionecm_read_cb':
/home/c456913/zephyrproject/zephyr/subsys/usb/device/class/netusb/function_ecm.c:295:undefined reference tonet_pkt_rx_alloc_with_buffer'
/home/c456913/zephyr-sdk-0.16.3/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd:/home/c456913/zephyrproject/zephyr/subsys/usb/device/class/netusb/function_ecm.c:302: undefined reference tonet_pkt_write'
/home/c456913/zephyr-sdk-0.16.3/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /home/c456913/zephyrproject/zephyr/subsys/usb/device/class/netusb/function_ecm.c:304: undefined reference to net_pkt_unref' /home/c456913/zephyr-sdk-0.16.3/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/usb/device/class/netusb/libsubsys__usb__device__class__netusb.a(function_ecm.c.obj): in function ecm_send':
/home/c456913/zephyrproject/zephyr/subsys/usb/device/class/netusb/function_ecm.c:260: undefined reference to `net_pkt_read'

Does that mean this board doesn't support netusb and if so how can I fix that?