Re: [PATCH liburing] test/io_uring_passthrough: add test for vectored fixed-buffers

[Pavel Begunkov <asml.silence@gmail.com>]

On 5/21/25 09:19, Anuj Gupta wrote:
> This patch adds support for vectored fixed buffer I/O using io_uring
> nvme passthrough, enabling broader testing of this path. Since older
> kernels may return -EINVAL for this combination (fixed + vectored), the
> test now detects this failure at runtime via a vec_fixed_supported flag.
> Subsequent iterations skip only the unsupported combinations while
> continuing to test all other valid variants.

LGTM, it's great to have the test, thanks Anuj. FWIW, that's the
same way I tested the kernel patch.

Somewhat unrelated questions, is there some particular reason why all
vectored versions are limited to 1 entry iovec? And why do we even care
calling io_uring_prep_read/write*() helpers when non of the rw related
fields set are used by passthrough? i.e. iovec passed in the second half
of the sqe.

-- 
Pavel Begunkov