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authorStefan Metzmacher <metze@samba.org>2022-10-27 21:34:45 +0300
committerJens Axboe <axboe@kernel.dk>2022-11-21 17:38:31 +0300
commite307e6698165ca6508ed42c69cb1be76c8eb6a3c (patch)
treeb64446ab77a5a0245f03be100af3ba00095cbcde /io_uring/notif.h
parenteb7081409f94a9a8608593d0fb63a1aa3d6f95d8 (diff)
downloadlinux-e307e6698165ca6508ed42c69cb1be76c8eb6a3c.tar.xz
io_uring/net: introduce IORING_SEND_ZC_REPORT_USAGE flag
It might be useful for applications to detect if a zero copy transfer with SEND[MSG]_ZC was actually possible or not. The application can fallback to plain SEND[MSG] in order to avoid the overhead of two cqes per request. Or it can generate a log message that could indicate to an administrator that no zero copy was possible and could explain degraded performance. Cc: stable@vger.kernel.org # 6.1 Link: https://lore.kernel.org/io-uring/fb6a7599-8a9b-15e5-9b64-6cd9d01c6ff4@gmail.com/T/#m2b0d9df94ce43b0e69e6c089bdff0ce6babbdfaa Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/8945b01756d902f5d5b0667f20b957ad3f742e5e.1666895626.git.metze@samba.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/notif.h')
-rw-r--r--io_uring/notif.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/notif.h b/io_uring/notif.h
index 5b4d710c8ca5..4ae696273c78 100644
--- a/io_uring/notif.h
+++ b/io_uring/notif.h
@@ -13,6 +13,9 @@ struct io_notif_data {
struct file *file;
struct ubuf_info uarg;
unsigned long account_pages;
+ bool zc_report;
+ bool zc_used;
+ bool zc_copied;
};
void io_notif_flush(struct io_kiocb *notif);