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io_uring/zcrx: cache fallback availability in zcrx ctx

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Store a flag in struct io_zcrx_ifq telling if the backing memory is
normal page or dmabuf based. It was looking it up from the area, however
it logically allocates from the zcrx ctx and not a particular area, and
once we add more than one area it'll become a mess.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/65e75408a7758fe7e60fae89b7a8d5ae4857f515.1774261953.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2026-03-23 12:44:03 +00:00 committed by Jens Axboe
parent f0b92207a0
commit 5c727ce042
2 changed files with 9 additions and 1 deletions
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9
io_uring/zcrx.c
View File

@ -423,8 +423,13 @@ static void io_zcrx_free_area(struct io_zcrx_ifq *ifq,
static int io_zcrx_append_area(struct io_zcrx_ifq *ifq,
struct io_zcrx_area *area)
{
bool kern_readable = !area->mem.is_dmabuf;
if (WARN_ON_ONCE(ifq->area))
return -EINVAL;
if (WARN_ON_ONCE(ifq->kern_readable != kern_readable))
return -EINVAL;
ifq->area = area;
return 0;
}
@ -882,6 +887,8 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
if (ret)
goto err;
ifq->kern_readable = !(area.flags & IORING_ZCRX_AREA_DMABUF);
if (!(reg.flags & ZCRX_REG_NODEV)) {
ret = zcrx_register_netdev(ifq, &reg, &area);
if (ret)
@ -1298,7 +1305,7 @@ static struct net_iov *io_alloc_fallback_niov(struct io_zcrx_ifq *ifq)
struct io_zcrx_area *area = ifq->area;
struct net_iov *niov = NULL;
if (area->mem.is_dmabuf)
if (!ifq->kern_readable)
return NULL;
scoped_guard(spinlock_bh, &area->freelist_lock)

1
io_uring/zcrx.h
View File

@ -54,6 +54,7 @@ struct io_zcrx_ifq {
unsigned niov_shift;
struct user_struct *user;
struct mm_struct *mm_account;
bool kern_readable;
struct zcrx_rq rq ____cacheline_aligned_in_smp;