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[188.28.125.106]) by smtp.gmail.com with ESMTPSA id t21-20020a05640203d500b0043573c59ea0sm9758451edw.90.2022.06.28.12.00.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jun 2022 12:00:17 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , Jonathan Lemon , Willem de Bruijn , Jens Axboe , kernel-team@fb.com, Pavel Begunkov Subject: [RFC net-next v3 21/29] io_uring: wire send zc request type Date: Tue, 28 Jun 2022 19:56:43 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add a new io_uring opcode IORING_OP_SENDZC. The main distinction from IORING_OP_SEND is that the user should specify a notification slot index in sqe::notification_idx and the buffers are safe to reuse only when the used notification is flushed and completes. Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 103 +++++++++++++++++++++++++++++++++- include/uapi/linux/io_uring.h | 5 ++ 2 files changed, 106 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index a88c9c73ed1d..4a1a1d43e9b3 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -716,6 +716,14 @@ struct io_sr_msg { unsigned int flags; }; +struct io_sendzc { + struct file *file; + void __user *buf; + size_t len; + u16 slot_idx; + int msg_flags; +}; + struct io_open { struct file *file; int dfd; @@ -1044,6 +1052,7 @@ struct io_kiocb { struct io_socket sock; struct io_nop nop; struct io_uring_cmd uring_cmd; + struct io_sendzc msgzc; }; u8 opcode; @@ -1384,6 +1393,13 @@ static const struct io_op_def io_op_defs[] = { .needs_async_setup = 1, .async_size = uring_cmd_pdu_size(1), }, + [IORING_OP_SENDZC] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .audit_skip = 1, + .ioprio = 1, + }, }; /* requests with any of those set should undergo io_disarm_next() */ @@ -1525,6 +1541,8 @@ const char *io_uring_get_opcode(u8 opcode) return "SOCKET"; case IORING_OP_URING_CMD: return "URING_CMD"; + case IORING_OP_SENDZC: + return "URING_SENDZC"; case IORING_OP_LAST: return "INVALID"; } @@ -2920,7 +2938,6 @@ static struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx, return notif; } -__attribute__((unused)) static inline struct io_notif *io_get_notif(struct io_ring_ctx *ctx, struct io_notif_slot *slot) { @@ -2929,7 +2946,6 @@ static inline struct io_notif *io_get_notif(struct io_ring_ctx *ctx, return slot->notif; } -__attribute__((unused)) static inline struct io_notif_slot *io_get_notif_slot(struct io_ring_ctx *ctx, int idx) __must_hold(&ctx->uring_lock) @@ -6546,6 +6562,83 @@ 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_sendzc *zc = &req->msgzc; + + if (READ_ONCE(sqe->ioprio) || READ_ONCE(sqe->addr2) || READ_ONCE(sqe->__pad2[0])) + return -EINVAL; + + zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); + zc->len = READ_ONCE(sqe->len); + zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; + zc->slot_idx = READ_ONCE(sqe->notification_idx); + if (zc->msg_flags & MSG_DONTWAIT) + req->flags |= REQ_F_NOWAIT; +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + zc->msg_flags |= MSG_CMSG_COMPAT; +#endif + return 0; +} + +static int io_sendzc(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_sendzc *zc = &req->msgzc; + struct io_notif_slot *notif_slot; + struct io_notif *notif; + struct msghdr msg; + struct iovec iov; + struct socket *sock; + unsigned msg_flags; + int ret, min_ret = 0; + + if (issue_flags & IO_URING_F_UNLOCKED) + return -EAGAIN; + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + notif_slot = io_get_notif_slot(ctx, zc->slot_idx); + if (!notif_slot) + return -EINVAL; + notif = io_get_notif(ctx, notif_slot); + if (!notif) + return -ENOMEM; + + msg.msg_name = NULL; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_namelen = 0; + msg.msg_managed_data = 0; + + ret = import_single_range(WRITE, zc->buf, zc->len, &iov, &msg.msg_iter); + if (unlikely(ret)) + return ret; + + msg_flags = zc->msg_flags | MSG_ZEROCOPY; + if (issue_flags & IO_URING_F_NONBLOCK) + msg_flags |= MSG_DONTWAIT; + if (msg_flags & MSG_WAITALL) + min_ret = iov_iter_count(&msg.msg_iter); + + msg.msg_flags = msg_flags; + msg.msg_ubuf = ¬if->uarg; + ret = sock_sendmsg(sock, &msg); + + if (unlikely(ret < min_ret)) { + if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) + return -EAGAIN; + if (ret == -ERESTARTSYS) + ret = -EINTR; + req_set_fail(req); + } + + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg) { @@ -7064,6 +7157,7 @@ IO_NETOP_PREP_ASYNC(connect); IO_NETOP_PREP(accept); IO_NETOP_PREP(socket); IO_NETOP_PREP(shutdown); +IO_NETOP_PREP(sendzc); IO_NETOP_FN(send); IO_NETOP_FN(recv); #endif /* CONFIG_NET */ @@ -8389,6 +8483,8 @@ 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); @@ -8689,6 +8785,9 @@ 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 19b9d7a2da29..6c6f20ae5a95 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -61,6 +61,10 @@ struct io_uring_sqe { union { __s32 splice_fd_in; __u32 file_index; + struct { + __u16 notification_idx; + __u16 __pad; + } __attribute__((packed)); }; union { struct { @@ -190,6 +194,7 @@ enum io_uring_op { IORING_OP_GETXATTR, IORING_OP_SOCKET, IORING_OP_URING_CMD, + IORING_OP_SENDZC, /* this goes last, obviously */ IORING_OP_LAST, -- 2.36.1