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io_uring/zcrx: add io_fill_zcrx_offsets() 

Add a helper io_fill_zcrx_offsets() that sets the constant offsets in
struct io_uring_zcrx_offsets returned to userspace.

Signed-off-by: David Wei <dw@davidwei.uk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Wei 2025-11-13 10:46:17 +00:00 committed by Jens Axboe
parent d7af80b213
commit 0926f94ab3
1 changed files with 9 additions and 4 deletions
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13
io_uring/zcrx.c
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@ -345,6 +345,13 @@ static void io_zcrx_get_niov_uref(struct net_iov *niov)
atomic_inc(io_get_user_counter(niov));
}
static void io_fill_zcrx_offsets(struct io_uring_zcrx_offsets *offsets)
{
offsets->head = offsetof(struct io_uring, head);
offsets->tail = offsetof(struct io_uring, tail);
offsets->rqes = ALIGN(sizeof(struct io_uring), L1_CACHE_BYTES);
}
static int io_allocate_rbuf_ring(struct io_ring_ctx *ctx,
struct io_zcrx_ifq *ifq,
struct io_uring_zcrx_ifq_reg *reg,
@ -356,7 +363,8 @@ static int io_allocate_rbuf_ring(struct io_ring_ctx *ctx,
void *ptr;
int ret;
off = ALIGN(sizeof(struct io_uring), L1_CACHE_BYTES);
io_fill_zcrx_offsets(&reg->offsets);
off = reg->offsets.rqes;
size = off + sizeof(struct io_uring_zcrx_rqe) * reg->rq_entries;
if (size > rd->size)
return -EINVAL;
@ -372,9 +380,6 @@ static int io_allocate_rbuf_ring(struct io_ring_ctx *ctx,
ifq->rq_ring = (struct io_uring *)ptr;
ifq->rqes = (struct io_uring_zcrx_rqe *)(ptr + off);
reg->offsets.head = offsetof(struct io_uring, head);
reg->offsets.tail = offsetof(struct io_uring, tail);
reg->offsets.rqes = off;
return 0;
}