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Message-Id: <41c71e1dc27c3ba17acb5a8f43e1e140fca71f19.1640029579.git.asml.silence@gmail.com>
Date: Tue, 21 Dec 2021 15:35:34 +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 12/19] io_uring: wire send zc request type
Add a new io_uring opcode IORING_OP_SENDZC. The main distinction from
other send requests is that the user should specify a tx context index,
which will notifiy the userspace when the kernel doesn't need the
buffers anymore and it's safe to reuse them. So, overwriting data
buffers is racy before getting a separate notification even when the
request is already completed.
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
fs/io_uring.c | 120 +++++++++++++++++++++++++++++++++-
include/uapi/linux/io_uring.h | 2 +
2 files changed, 121 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 92190679f3f6..9452b4ec32b6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -600,6 +600,16 @@ struct io_sr_msg {
size_t len;
};
+struct io_sendzc {
+ struct file *file;
+ void __user *buf;
+ size_t len;
+ struct io_tx_ctx *tx_ctx;
+ int msg_flags;
+ int addr_len;
+ void __user *addr;
+};
+
struct io_open {
struct file *file;
int dfd;
@@ -874,6 +884,7 @@ struct io_kiocb {
struct io_mkdir mkdir;
struct io_symlink symlink;
struct io_hardlink hardlink;
+ struct io_sendzc msgzc;
};
u8 opcode;
@@ -1123,6 +1134,12 @@ static const struct io_op_def io_op_defs[] = {
[IORING_OP_MKDIRAT] = {},
[IORING_OP_SYMLINKAT] = {},
[IORING_OP_LINKAT] = {},
+ [IORING_OP_SENDZC] = {
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ .pollout = 1,
+ .audit_skip = 1,
+ },
};
/* requests with any of those set should undergo io_disarm_next() */
@@ -1999,7 +2016,6 @@ static struct io_tx_notifier *io_alloc_tx_notifier(struct io_ring_ctx *ctx,
return notifier;
}
-__attribute__((unused))
static inline struct io_tx_notifier *io_get_tx_notifier(struct io_ring_ctx *ctx,
struct io_tx_ctx *tx_ctx)
{
@@ -5025,6 +5041,102 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags)
return 0;
}
+static int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_ring_ctx *ctx = req->ctx;
+ struct io_sendzc *sr = &req->msgzc;
+ unsigned int idx;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (READ_ONCE(sqe->ioprio))
+ return -EINVAL;
+
+ sr->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ sr->len = READ_ONCE(sqe->len);
+ sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
+ if (sr->msg_flags & MSG_DONTWAIT)
+ req->flags |= REQ_F_NOWAIT;
+
+ idx = READ_ONCE(sqe->tx_ctx_idx);
+ if (idx > ctx->nr_tx_ctxs)
+ return -EINVAL;
+ idx = array_index_nospec(idx, ctx->nr_tx_ctxs);
+ req->msgzc.tx_ctx = &ctx->tx_ctxs[idx];
+
+ sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ sr->addr_len = READ_ONCE(sqe->__pad2[0]);
+
+#ifdef CONFIG_COMPAT
+ if (req->ctx->compat)
+ sr->msg_flags |= MSG_CMSG_COMPAT;
+#endif
+ return 0;
+}
+
+static int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct sockaddr_storage address;
+ struct io_ring_ctx *ctx = req->ctx;
+ struct io_tx_notifier *notifier;
+ struct io_sendzc *sr = &req->msgzc;
+ struct msghdr msg;
+ struct iovec iov;
+ struct socket *sock;
+ unsigned flags;
+ int ret, min_ret = 0;
+
+ sock = sock_from_file(req->file);
+ if (unlikely(!sock))
+ return -ENOTSOCK;
+ ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
+ if (unlikely(ret))
+ return ret;
+
+ msg.msg_name = NULL;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_namelen = 0;
+ if (sr->addr) {
+ ret = move_addr_to_kernel(sr->addr, sr->addr_len, &address);
+ if (ret < 0)
+ return ret;
+ msg.msg_name = (struct sockaddr *)&address;
+ msg.msg_namelen = sr->addr_len;
+ }
+
+ io_ring_submit_lock(ctx, issue_flags & IO_URING_F_UNLOCKED);
+ notifier = io_get_tx_notifier(ctx, req->msgzc.tx_ctx);
+ if (!notifier) {
+ req_set_fail(req);
+ ret = -ENOMEM;
+ goto out;
+ }
+ msg.msg_ubuf = ¬ifier->uarg;
+
+ flags = sr->msg_flags | MSG_ZEROCOPY;
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ flags |= MSG_DONTWAIT;
+ if (flags & MSG_WAITALL)
+ min_ret = iov_iter_count(&msg.msg_iter);
+ msg.msg_flags = flags;
+ ret = sock_sendmsg(sock, &msg);
+
+ if (ret < min_ret) {
+ if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
+ goto out;
+ if (ret == -ERESTARTSYS)
+ ret = -EINTR;
+ req_set_fail(req);
+ }
+ io_ring_submit_unlock(ctx, issue_flags & IO_URING_F_UNLOCKED);
+ __io_req_complete(req, issue_flags, ret, 0);
+ return 0;
+out:
+ io_ring_submit_unlock(ctx, issue_flags & IO_URING_F_UNLOCKED);
+ return ret;
+}
+
static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
struct io_async_msghdr *iomsg)
{
@@ -5428,6 +5540,7 @@ IO_NETOP_PREP_ASYNC(sendmsg);
IO_NETOP_PREP_ASYNC(recvmsg);
IO_NETOP_PREP_ASYNC(connect);
IO_NETOP_PREP(accept);
+IO_NETOP_PREP(sendzc);
IO_NETOP_FN(send);
IO_NETOP_FN(recv);
#endif /* CONFIG_NET */
@@ -6575,6 +6688,8 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
case IORING_OP_SENDMSG:
case IORING_OP_SEND:
return io_sendmsg_prep(req, sqe);
+ case IORING_OP_SENDZC:
+ return io_sendzc_prep(req, sqe);
case IORING_OP_RECVMSG:
case IORING_OP_RECV:
return io_recvmsg_prep(req, sqe);
@@ -6832,6 +6947,9 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
case IORING_OP_SEND:
ret = io_send(req, issue_flags);
break;
+ case IORING_OP_SENDZC:
+ ret = io_sendzc(req, issue_flags);
+ break;
case IORING_OP_RECVMSG:
ret = io_recvmsg(req, issue_flags);
break;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index f2e8d18e40e0..bbc78fe8ca77 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -59,6 +59,7 @@ struct io_uring_sqe {
union {
__s32 splice_fd_in;
__u32 file_index;
+ __u32 tx_ctx_idx;
};
__u64 __pad2[2];
};
@@ -143,6 +144,7 @@ enum {
IORING_OP_MKDIRAT,
IORING_OP_SYMLINKAT,
IORING_OP_LINKAT,
+ IORING_OP_SENDZC,
/* this goes last, obviously */
IORING_OP_LAST,
--
2.34.1
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