How to test zcrx without specialized hardware?

[wokron]

I would like to integrate the zcrx feature into my project. However, the requirement for specialized hardware makes it difficult to develop and test based on zcrx.

From the mailing list, I found that io_uring has been working on using netdevsim as a test device for quite some time. However, after testing, I found that zcrx still does not support netdevsim devices.

My test environment:

• qemu-system-x86_64 8.2.2
• Linux Kernel 6.18.4

During debugging, I found that the problem lies in the kernel function netdev_queue_get_dma_dev returning NULL. This seems to indicate that netdevsim does not support DMA operations.

I would like to ask: am I using it incorrectly, or does netdevsim indeed not support zcrx yet? If it is not supported, is there any way to test zcrx without specialized hardware? This would make development and testing (especially CI integration) much more convenient.

Thank you!