linux-kernel - [RFC v2 15/19] io_uring: sendzc with fixed buffers

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Message-Id: <ddc564fc92abfd13bfac2f6d9aa118ac15e8f078.1640029579.git.asml.silence@gmail.com>
Date:   Tue, 21 Dec 2021 15:35:37 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     io-uring@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [RFC v2 15/19] io_uring: sendzc with fixed buffers

Allow zerocopy sends to use fixed buffers.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c                 | 19 +++++++++++++++++--
 include/uapi/linux/io_uring.h |  1 +
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 40a8d7799be3..654023ba0b91 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5048,7 +5048,7 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags)
 	return 0;
 }
 
-#define IO_SENDZC_VALID_FLAGS IORING_SENDZC_FLUSH
+#define IO_SENDZC_VALID_FLAGS (IORING_SENDZC_FLUSH | IORING_SENDZC_FIXED_BUF)
 
 static int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
@@ -5078,6 +5078,15 @@ static int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (req->msgzc.zc_flags & ~IO_SENDZC_VALID_FLAGS)
 		return -EINVAL;
 
+	if (req->msgzc.zc_flags & IORING_SENDZC_FIXED_BUF) {
+		idx = READ_ONCE(sqe->buf_index);
+		if (unlikely(idx >= ctx->nr_user_bufs))
+			return -EFAULT;
+		idx = array_index_nospec(idx, ctx->nr_user_bufs);
+		req->imu = READ_ONCE(ctx->user_bufs[idx]);
+		io_req_set_rsrc_node(req, ctx);
+	}
+
 #ifdef CONFIG_COMPAT
 	if (req->ctx->compat)
 		sr->msg_flags |= MSG_CMSG_COMPAT;
@@ -5101,7 +5110,13 @@ static int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
-	ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
+	if (req->msgzc.zc_flags & IORING_SENDZC_FIXED_BUF) {
+		ret = __io_import_fixed(WRITE, &msg.msg_iter, req->imu,
+					(u64)sr->buf, sr->len);
+	} else {
+		ret = import_single_range(WRITE, sr->buf, sr->len, &iov,
+					  &msg.msg_iter);
+	}
 	if (unlikely(ret))
 		return ret;
 
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index ac18e8e6f86f..740af1d0409f 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -189,6 +189,7 @@ enum {
 
 enum {
 	IORING_SENDZC_FLUSH		= (1U << 0),
+	IORING_SENDZC_FIXED_BUF		= (1U << 1),
 };
 
 /*
-- 
2.34.1