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From: Pavel Begunkov <[email protected]>
To: [email protected], [email protected],
	[email protected]
Cc: "David S . Miller" <[email protected]>,
	Jakub Kicinski <[email protected]>,
	Jonathan Lemon <[email protected]>,
	Willem de Bruijn <[email protected]>,
	Jens Axboe <[email protected]>,
	[email protected], Pavel Begunkov <[email protected]>
Subject: [RFC net-next v3 04/29] skbuff: carry external ubuf_info in msghdr
Date: Tue, 28 Jun 2022 19:56:26 +0100	[thread overview]
Message-ID: <1634a40ad0cf05eeee8dd9e88d89f1558704bf2c.1653992701.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Make possible for network in-kernel callers like io_uring to pass in a
custom ubuf_info by setting it in a new field of struct msghdr.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c          | 4 ++++
 include/linux/socket.h | 7 +++++++
 net/compat.c           | 2 ++
 net/socket.c           | 6 ++++++
 4 files changed, 19 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 8e75539fdc1d..6a57a5ae18fb 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6230,6 +6230,8 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags)
 	msg.msg_control = NULL;
 	msg.msg_controllen = 0;
 	msg.msg_namelen = 0;
+	msg.msg_ubuf = NULL;
+	msg.msg_managed_data = false;
 
 	flags = sr->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -6500,6 +6502,8 @@ static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	msg.msg_flags = 0;
 	msg.msg_controllen = 0;
 	msg.msg_iocb = NULL;
+	msg.msg_ubuf = NULL;
+	msg.msg_managed_data = false;
 
 	flags = sr->msg_flags;
 	if (force_nonblock)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 17311ad9f9af..ba84ee614d5a 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -66,9 +66,16 @@ struct msghdr {
 	};
 	bool		msg_control_is_user : 1;
 	bool		msg_get_inq : 1;/* return INQ after receive */
+	/*
+	 * The data pages are pinned and won't be released before ->msg_ubuf
+	 * is released. ->msg_iter should point to a bvec and ->msg_ubuf has
+	 * to be non-NULL.
+	 */
+	bool		msg_managed_data : 1;
 	unsigned int	msg_flags;	/* flags on received message */
 	__kernel_size_t	msg_controllen;	/* ancillary data buffer length */
 	struct kiocb	*msg_iocb;	/* ptr to iocb for async requests */
+	struct ubuf_info *msg_ubuf;
 };
 
 struct user_msghdr {
diff --git a/net/compat.c b/net/compat.c
index 210fc3b4d0d8..435846fa85e0 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -80,6 +80,8 @@ int __get_compat_msghdr(struct msghdr *kmsg,
 		return -EMSGSIZE;
 
 	kmsg->msg_iocb = NULL;
+	kmsg->msg_ubuf = NULL;
+	kmsg->msg_managed_data = false;
 	*ptr = msg.msg_iov;
 	*len = msg.msg_iovlen;
 	return 0;
diff --git a/net/socket.c b/net/socket.c
index 2bc8773d9dc5..0963a02b1472 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2106,6 +2106,8 @@ int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
 	msg.msg_control = NULL;
 	msg.msg_controllen = 0;
 	msg.msg_namelen = 0;
+	msg.msg_ubuf = NULL;
+	msg.msg_managed_data = false;
 	if (addr) {
 		err = move_addr_to_kernel(addr, addr_len, &address);
 		if (err < 0)
@@ -2171,6 +2173,8 @@ int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
 	msg.msg_namelen = 0;
 	msg.msg_iocb = NULL;
 	msg.msg_flags = 0;
+	msg.msg_ubuf = NULL;
+	msg.msg_managed_data = false;
 	if (sock->file->f_flags & O_NONBLOCK)
 		flags |= MSG_DONTWAIT;
 	err = sock_recvmsg(sock, &msg, flags);
@@ -2409,6 +2413,8 @@ int __copy_msghdr_from_user(struct msghdr *kmsg,
 		return -EMSGSIZE;
 
 	kmsg->msg_iocb = NULL;
+	kmsg->msg_ubuf = NULL;
+	kmsg->msg_managed_data = false;
 	*uiov = msg.msg_iov;
 	*nsegs = msg.msg_iovlen;
 	return 0;
-- 
2.36.1


  parent reply	other threads:[~2022-06-28 19:00 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-28 18:56 [RFC net-next v3 00/29] io_uring zerocopy send Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 01/29] ipv4: avoid partial copy for zc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 02/29] ipv6: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 03/29] skbuff: add SKBFL_DONT_ORPHAN flag Pavel Begunkov
2022-06-28 18:56 ` Pavel Begunkov [this message]
2022-06-28 18:56 ` [RFC net-next v3 05/29] net: bvec specific path in zerocopy_sg_from_iter Pavel Begunkov
2022-06-28 20:06   ` Al Viro
2022-06-28 21:33     ` Pavel Begunkov
2022-06-28 22:52   ` David Ahern
2022-07-04 13:31     ` Pavel Begunkov
2022-07-05  2:28       ` David Ahern
2022-07-05 14:03         ` Pavel Begunkov
2022-07-05 22:09           ` Pavel Begunkov
2022-07-06 15:11             ` David Ahern
2022-06-28 18:56 ` [RFC net-next v3 06/29] net: optimise bvec-based zc page referencing Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 07/29] net: don't track pfmemalloc for managed frags Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 08/29] skbuff: don't mix ubuf_info of different types Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 09/29] ipv4/udp: support zc with managed data Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 10/29] ipv6/udp: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 11/29] tcp: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 12/29] tcp: kill extra io_uring's uarg refcounting Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 13/29] net: let callers provide extra ubuf_info refs Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 14/29] io_uring: opcode independent fixed buf import Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 15/29] io_uring: add zc notification infrastructure Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 16/29] io_uring: cache struct io_notif Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 17/29] io_uring: complete notifiers in tw Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 18/29] io_uring: add notification slot registration Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 19/29] io_uring: rename IORING_OP_FILES_UPDATE Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 20/29] io_uring: add zc notification flush requests Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 21/29] io_uring: wire send zc request type Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 22/29] io_uring: account locked pages for non-fixed zc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 23/29] io_uring: allow to pass addr into sendzc Pavel Begunkov
2022-06-29  7:42   ` Stefan Metzmacher
2022-06-29  9:53     ` Pavel Begunkov
2022-08-13  8:45       ` Stefan Metzmacher
2022-08-15  9:46         ` Pavel Begunkov
2022-08-15 11:40           ` Stefan Metzmacher
2022-08-15 12:19             ` Pavel Begunkov
2022-08-15 13:30               ` Stefan Metzmacher
2022-08-15 14:09                 ` Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 24/29] io_uring: add rsrc referencing for notifiers Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 25/29] io_uring: sendzc with fixed buffers Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 26/29] io_uring: flush notifiers after sendzc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 27/29] io_uring: allow to override zc tag on flush Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 28/29] io_uring: batch submission notif referencing Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 29/29] selftests/io_uring: test zerocopy send Pavel Begunkov
2022-06-28 19:03 ` [RFC net-next v3 00/29] io_uring " Pavel Begunkov

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