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io_uring/zcrx: notify user on frag copy fallback

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Add a ZCRX_NOTIF_COPY notification type to signal userspace when a
received fragment could not be delivered using zero-copy and was
instead copied into a buffer.

Signed-off-by: Clément Léger <cleger@meta.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/3d54bcd8bf10b3a1e88beb0cd39c40c3937bea4f.1779189667.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Clément Léger
2026-05-19 12:44:33 +01:00
committed by Jens Axboe
parent 0719e10d82
commit 255180f703
3 changed files with 8 additions and 2 deletions
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1
include/uapi/linux/io_uring/zcrx.h
View File

@@ -70,6 +70,7 @@ enum zcrx_features {
enum zcrx_notification_type {
ZCRX_NOTIF_NO_BUFFERS,
ZCRX_NOTIF_COPY,
__ZCRX_NOTIF_TYPE_LAST,
};

7
io_uring/zcrx.c
View File

@@ -1532,8 +1532,13 @@ static int io_zcrx_copy_frag(struct io_kiocb *req, struct io_zcrx_ifq *ifq,
const skb_frag_t *frag, int off, int len)
{
struct page *page = skb_frag_page(frag);
int ret;
return io_zcrx_copy_chunk(req, ifq, page, off + skb_frag_off(frag), len);
ret = io_zcrx_copy_chunk(req, ifq, page, off + skb_frag_off(frag), len);
if (ret > 0)
zcrx_send_notif(ifq, ZCRX_NOTIF_COPY);
return ret;
}
static int io_zcrx_recv_frag(struct io_kiocb *req, struct io_zcrx_ifq *ifq,

2
io_uring/zcrx.h
View File

@@ -11,7 +11,7 @@
#define ZCRX_SUPPORTED_REG_FLAGS (ZCRX_REG_IMPORT | ZCRX_REG_NODEV)
#define ZCRX_FEATURES (ZCRX_FEATURE_RX_PAGE_SIZE |\
ZCRX_FEATURE_NOTIFICATION)
#define ZCRX_NOTIF_TYPE_MASK (1U << ZCRX_NOTIF_NO_BUFFERS)
#define ZCRX_NOTIF_TYPE_MASK ((1U << ZCRX_NOTIF_NO_BUFFERS) | (1U << ZCRX_NOTIF_COPY))
struct io_zcrx_mem {
unsigned long size;