diff options
| author | Clément Léger <cleger@meta.com> | 2026-05-19 12:44:33 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-05-26 10:42:01 -0600 |
| commit | 255180f7034f48aa5b0c8df70228307394bddbb9 (patch) | |
| tree | a4bccc913785f78ff456ea00eb852e4242859986 /io_uring | |
| parent | 0719e10d826aa0ba4840917d0261986eaead9a51 (diff) | |
| download | linux-255180f7034f48aa5b0c8df70228307394bddbb9.tar.gz linux-255180f7034f48aa5b0c8df70228307394bddbb9.zip | |
io_uring/zcrx: notify user on frag copy fallback
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>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/zcrx.c | 7 | ||||
| -rw-r--r-- | io_uring/zcrx.h | 2 |
2 files changed, 7 insertions, 2 deletions
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index 2bca9a58dcf6..404f9e7574a2 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -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; + + 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 io_zcrx_copy_chunk(req, ifq, page, off + skb_frag_off(frag), len); + return ret; } static int io_zcrx_recv_frag(struct io_kiocb *req, struct io_zcrx_ifq *ifq, diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h index e8b7717d6adf..54d91b580eaf 100644 --- a/io_uring/zcrx.h +++ b/io_uring/zcrx.h @@ -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; |