Offloaded sockets driver on Babblesim nRF54L15

[Tom Weber]

Hello!

I can use the offloaded sockets driver with these configuration options on the native_sim target:

CONFIG_NET_DRIVERS=y
CONFIG_NET_NATIVE_OFFLOADED_SOCKETS=y

However, trying to build the same code for nrf54l15bsim/nrf54l15/cpuapp results in an error:

/.../zephyr/drivers/net/nsos_sockets.c: In function ‘nsos_socket_offload_init’:
/.../zephyr/drivers/net/nsos_sockets.c:1563:21: error: ‘NSOS_IRQ’ undeclared (first use in this function)
1563 | IRQ_CONNECT(NSOS_IRQ, NSOS_IRQ_PRIORITY,

It turns out that NSOS_IRQ is only defined in zephyr/boards/native/native_sim/board_soc.h but it is not loaded.

Among the include directories are:

zephyr/soc/native/inf_clock
zephyr/boards/native/nrf_bsim

The file nsos_sockets.c includes <soc.h> which seems to be zephyr/soc/native/inf_clock/soc.h, which in turn includes "board_soc.h", which seems to be zephyr/boards/native/nrf_bsim/board_soc.h, which does not define NSOS_IRQ.

Is this an oversight? According to the documentation, the Babblesim targets are based on the Native simulator, and there is no mention of offloaded sockets not being included.

My version of Zephyr is 4.0.99.

[Alberto Escolar]

Hi, in principle "native_sim" drivers are not supported in the nrf*bsim targets.
Quite many of them work, either out of the box, or with some minor dts config changes, due to both targets being based on the native_simulator.
In the case of this nsos driver, as you found out, it uses an interrupt which is not mapped to anything in the nrf bsim targets (nrf*bsim targets have the "real HW" interrupts map).
Would you be so kind as to create a feature request ticket in upstream Zephyr requesting this to work? https://github.com/zephyrproject-rtos/zephyr/issues/new/choose
(Better don't mention NCS there, as this is a plain vanilla Zephyr matter)
I'll take a look there once you do.
In the meanwhile, if you are ok with a quick hack, you can #define NSOS_IRQ to be one of the unused interrupt lines.
https://github.com/BabbleSim/ext_nRF_hw_models/blob/main/src/HW_models/NHW_config.h#L692 

[Tom Weber]

Hello Alberto, thank you!

I have a created a ticket for this on Github:

github.com/.../94161