Re: [PATCH liburing 3/3] examples/zcrx: add refill queue allocation modes

[David Wei <dw@davidwei.uk>]

On 2025-04-20 04:24, Pavel Begunkov wrote:
> Refill queue creating is backed by the region api, which can either be
> user or kernel allocated. Add an option to switch between the modes.
> 
> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> ---
>  examples/zcrx.c | 46 ++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 36 insertions(+), 10 deletions(-)
> 
> diff --git a/examples/zcrx.c b/examples/zcrx.c
> index 8989c9a4..eafe1969 100644
> --- a/examples/zcrx.c
> +++ b/examples/zcrx.c
> @@ -39,6 +39,13 @@
[...]
> @@ -128,6 +140,15 @@ static void setup_zcrx(struct io_uring *ring)
>  	if (ret)
>  		t_error(1, 0, "io_uring_register_ifq(): %d", ret);
>  
> +	if (cfg_rq_alloc_mode == RQ_ALLOC_USER) {

cfg_rq_alloc_mode == RQ_ALLOC_KERNEL?

> +		ring_ptr = mmap(NULL, ring_size,
> +				PROT_READ | PROT_WRITE,
> +				MAP_SHARED | MAP_POPULATE,
> +				ring->ring_fd, region_reg.mmap_offset);
> +		if (ring_ptr == MAP_FAILED)
> +			t_error(1, 0, "mmap(): refill ring");
> +	}
> +
>  	rq_ring.khead = (unsigned int *)((char *)ring_ptr + reg.offsets.head);
>  	rq_ring.ktail = (unsigned int *)((char *)ring_ptr + reg.offsets.tail);
>  	rq_ring.rqes = (struct io_uring_zcrx_rqe *)((char *)ring_ptr + reg.offsets.rqes);