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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, Jakub Kicinski <[email protected]>,
	Paolo Abeni <[email protected]>,
	"David S . Miller" <[email protected]>
Cc: [email protected], [email protected],
	[email protected], Stefan Metzmacher <[email protected]>
Subject: [PATCH for-6.1 2/3] io_uring/net: fail zc send when unsupported by socket
Date: Fri, 21 Oct 2022 11:16:40 +0100	[thread overview]
Message-ID: <2db3c7f16bb6efab4b04569cd16e6242b40c5cb3.1666346426.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

If a protocol doesn't support zerocopy it will silently fall back to
copying. This type of behaviour has always been a source of troubles
so it's better to fail such requests instead.

Cc: <[email protected]> # 6.0
Signed-off-by: Pavel Begunkov <[email protected]>
---
 io_uring/net.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/io_uring/net.c b/io_uring/net.c
index 8c7226b5bf41..26ff3675214d 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1056,6 +1056,8 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 	sock = sock_from_file(req->file);
 	if (unlikely(!sock))
 		return -ENOTSOCK;
+	if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
+		return -EOPNOTSUPP;
 
 	msg.msg_name = NULL;
 	msg.msg_control = NULL;
-- 
2.38.0


  parent reply	other threads:[~2022-10-21 10:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-21 10:16 [PATCH for-6.1 0/3] fail io_uring zc with sockets not supporting it Pavel Begunkov
2022-10-21 10:16 ` [PATCH for-6.1 1/3] net: flag sockets supporting msghdr originated zerocopy Pavel Begunkov
2022-10-21 16:14   ` Jakub Kicinski
2022-10-22 15:57     ` Pavel Begunkov
2022-10-22 16:07       ` Jens Axboe
2022-10-24 12:49         ` Stefan Metzmacher
2022-10-24 14:12           ` Stefan Metzmacher
2022-10-24 17:00             ` Pavel Begunkov
2022-10-24 17:45               ` Stefan Metzmacher
2022-10-21 10:16 ` Pavel Begunkov [this message]
2022-10-21 10:16 ` [PATCH for-6.1 3/3] io_uring/net: fail zc sendmsg when unsupported by socket Pavel Begunkov
2022-10-21 10:27 ` [PATCH for-6.1 0/3] fail io_uring zc with sockets not supporting it Stefan Metzmacher
2022-10-21 10:42   ` Pavel Begunkov
2022-10-21 12:49     ` Stefan Metzmacher
2022-10-24 20:40 ` patchwork-bot+netdevbpf
2022-10-24 21:15   ` Jakub Kicinski

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