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![Josh Triplett](/assets/img/avatar_default.png)
With IORING_REGISTER_USE_REGISTERED_RING, an application can register the ring fd and use it via registered index rather than installed fd. This allows using a registered ring for everything *except* the initial mmap. With IORING_SETUP_NO_MMAP, io_uring_setup uses buffers allocated by the user, rather than requiring a subsequent mmap. The combination of the two allows a user to operate *entirely* via a registered ring fd, making it unnecessary to ever install the fd in the first place. So, add a flag IORING_SETUP_REGISTERED_FD_ONLY to make io_uring_setup register the fd and return a registered index, without installing the fd. This allows an application to avoid touching the fd table at all, and allows a library to never even momentarily install a file descriptor. This splits out an io_ring_add_registered_file helper from io_ring_add_registered_fd, for use by io_uring_setup. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Link: https://lore.kernel.org/r/bc8f431bada371c183b95a83399628b605e978a3.1682699803.git.josh@joshtriplett.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
722 lines
18 KiB
C
722 lines
18 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
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/*
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* Header file for the io_uring interface.
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*
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* Copyright (C) 2019 Jens Axboe
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* Copyright (C) 2019 Christoph Hellwig
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*/
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#ifndef LINUX_IO_URING_H
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#define LINUX_IO_URING_H
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#include <linux/fs.h>
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#include <linux/types.h>
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/*
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* this file is shared with liburing and that has to autodetect
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* if linux/time_types.h is available or not, it can
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* define UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
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* if linux/time_types.h is not available
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*/
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#ifndef UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
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#include <linux/time_types.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* IO submission data structure (Submission Queue Entry)
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*/
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struct io_uring_sqe {
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__u8 opcode; /* type of operation for this sqe */
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__u8 flags; /* IOSQE_ flags */
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__u16 ioprio; /* ioprio for the request */
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__s32 fd; /* file descriptor to do IO on */
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union {
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__u64 off; /* offset into file */
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__u64 addr2;
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struct {
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__u32 cmd_op;
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__u32 __pad1;
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};
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};
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union {
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__u64 addr; /* pointer to buffer or iovecs */
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__u64 splice_off_in;
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};
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__u32 len; /* buffer size or number of iovecs */
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union {
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__kernel_rwf_t rw_flags;
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__u32 fsync_flags;
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__u16 poll_events; /* compatibility */
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__u32 poll32_events; /* word-reversed for BE */
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__u32 sync_range_flags;
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__u32 msg_flags;
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__u32 timeout_flags;
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__u32 accept_flags;
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__u32 cancel_flags;
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__u32 open_flags;
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__u32 statx_flags;
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__u32 fadvise_advice;
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__u32 splice_flags;
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__u32 rename_flags;
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__u32 unlink_flags;
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__u32 hardlink_flags;
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__u32 xattr_flags;
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__u32 msg_ring_flags;
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__u32 uring_cmd_flags;
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};
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__u64 user_data; /* data to be passed back at completion time */
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/* pack this to avoid bogus arm OABI complaints */
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union {
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/* index into fixed buffers, if used */
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__u16 buf_index;
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/* for grouped buffer selection */
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__u16 buf_group;
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} __attribute__((packed));
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/* personality to use, if used */
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__u16 personality;
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union {
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__s32 splice_fd_in;
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__u32 file_index;
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struct {
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__u16 addr_len;
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__u16 __pad3[1];
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};
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};
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union {
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struct {
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__u64 addr3;
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__u64 __pad2[1];
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};
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/*
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* If the ring is initialized with IORING_SETUP_SQE128, then
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* this field is used for 80 bytes of arbitrary command data
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*/
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__u8 cmd[0];
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};
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};
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/*
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* If sqe->file_index is set to this for opcodes that instantiate a new
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* direct descriptor (like openat/openat2/accept), then io_uring will allocate
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* an available direct descriptor instead of having the application pass one
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* in. The picked direct descriptor will be returned in cqe->res, or -ENFILE
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* if the space is full.
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*/
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#define IORING_FILE_INDEX_ALLOC (~0U)
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enum {
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IOSQE_FIXED_FILE_BIT,
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IOSQE_IO_DRAIN_BIT,
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IOSQE_IO_LINK_BIT,
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IOSQE_IO_HARDLINK_BIT,
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IOSQE_ASYNC_BIT,
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IOSQE_BUFFER_SELECT_BIT,
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IOSQE_CQE_SKIP_SUCCESS_BIT,
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};
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/*
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* sqe->flags
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*/
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/* use fixed fileset */
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#define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT)
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/* issue after inflight IO */
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#define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT)
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/* links next sqe */
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#define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT)
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/* like LINK, but stronger */
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#define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT)
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/* always go async */
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#define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT)
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/* select buffer from sqe->buf_group */
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#define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT)
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/* don't post CQE if request succeeded */
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#define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT)
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/*
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* io_uring_setup() flags
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*/
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#define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */
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#define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */
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#define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */
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#define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */
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#define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */
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#define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */
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#define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */
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#define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */
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/*
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* Cooperative task running. When requests complete, they often require
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* forcing the submitter to transition to the kernel to complete. If this
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* flag is set, work will be done when the task transitions anyway, rather
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* than force an inter-processor interrupt reschedule. This avoids interrupting
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* a task running in userspace, and saves an IPI.
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*/
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#define IORING_SETUP_COOP_TASKRUN (1U << 8)
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/*
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* If COOP_TASKRUN is set, get notified if task work is available for
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* running and a kernel transition would be needed to run it. This sets
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* IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
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*/
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#define IORING_SETUP_TASKRUN_FLAG (1U << 9)
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#define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */
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#define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */
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/*
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* Only one task is allowed to submit requests
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*/
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#define IORING_SETUP_SINGLE_ISSUER (1U << 12)
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/*
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* Defer running task work to get events.
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* Rather than running bits of task work whenever the task transitions
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* try to do it just before it is needed.
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*/
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#define IORING_SETUP_DEFER_TASKRUN (1U << 13)
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/*
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* Application provides the memory for the rings
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*/
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#define IORING_SETUP_NO_MMAP (1U << 14)
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/*
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* Register the ring fd in itself for use with
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* IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather
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* than an fd.
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*/
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#define IORING_SETUP_REGISTERED_FD_ONLY (1U << 15)
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enum io_uring_op {
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IORING_OP_NOP,
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IORING_OP_READV,
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IORING_OP_WRITEV,
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IORING_OP_FSYNC,
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IORING_OP_READ_FIXED,
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IORING_OP_WRITE_FIXED,
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IORING_OP_POLL_ADD,
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IORING_OP_POLL_REMOVE,
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IORING_OP_SYNC_FILE_RANGE,
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IORING_OP_SENDMSG,
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IORING_OP_RECVMSG,
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IORING_OP_TIMEOUT,
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IORING_OP_TIMEOUT_REMOVE,
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IORING_OP_ACCEPT,
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IORING_OP_ASYNC_CANCEL,
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IORING_OP_LINK_TIMEOUT,
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IORING_OP_CONNECT,
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IORING_OP_FALLOCATE,
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IORING_OP_OPENAT,
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IORING_OP_CLOSE,
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IORING_OP_FILES_UPDATE,
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IORING_OP_STATX,
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IORING_OP_READ,
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IORING_OP_WRITE,
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IORING_OP_FADVISE,
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IORING_OP_MADVISE,
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IORING_OP_SEND,
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IORING_OP_RECV,
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IORING_OP_OPENAT2,
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IORING_OP_EPOLL_CTL,
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IORING_OP_SPLICE,
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IORING_OP_PROVIDE_BUFFERS,
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IORING_OP_REMOVE_BUFFERS,
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IORING_OP_TEE,
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IORING_OP_SHUTDOWN,
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IORING_OP_RENAMEAT,
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IORING_OP_UNLINKAT,
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IORING_OP_MKDIRAT,
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IORING_OP_SYMLINKAT,
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IORING_OP_LINKAT,
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IORING_OP_MSG_RING,
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IORING_OP_FSETXATTR,
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IORING_OP_SETXATTR,
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IORING_OP_FGETXATTR,
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IORING_OP_GETXATTR,
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IORING_OP_SOCKET,
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IORING_OP_URING_CMD,
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IORING_OP_SEND_ZC,
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IORING_OP_SENDMSG_ZC,
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/* this goes last, obviously */
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IORING_OP_LAST,
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};
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/*
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* sqe->uring_cmd_flags
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* IORING_URING_CMD_FIXED use registered buffer; pass this flag
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* along with setting sqe->buf_index.
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*/
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#define IORING_URING_CMD_FIXED (1U << 0)
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/*
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* sqe->fsync_flags
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*/
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#define IORING_FSYNC_DATASYNC (1U << 0)
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/*
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* sqe->timeout_flags
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*/
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#define IORING_TIMEOUT_ABS (1U << 0)
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#define IORING_TIMEOUT_UPDATE (1U << 1)
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#define IORING_TIMEOUT_BOOTTIME (1U << 2)
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#define IORING_TIMEOUT_REALTIME (1U << 3)
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#define IORING_LINK_TIMEOUT_UPDATE (1U << 4)
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#define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5)
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#define IORING_TIMEOUT_MULTISHOT (1U << 6)
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#define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
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#define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
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/*
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* sqe->splice_flags
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* extends splice(2) flags
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*/
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#define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */
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/*
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* POLL_ADD flags. Note that since sqe->poll_events is the flag space, the
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* command flags for POLL_ADD are stored in sqe->len.
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*
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* IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if
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* the poll handler will continue to report
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* CQEs on behalf of the same SQE.
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*
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* IORING_POLL_UPDATE Update existing poll request, matching
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* sqe->addr as the old user_data field.
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*
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* IORING_POLL_LEVEL Level triggered poll.
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*/
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#define IORING_POLL_ADD_MULTI (1U << 0)
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#define IORING_POLL_UPDATE_EVENTS (1U << 1)
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#define IORING_POLL_UPDATE_USER_DATA (1U << 2)
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#define IORING_POLL_ADD_LEVEL (1U << 3)
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/*
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* ASYNC_CANCEL flags.
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*
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* IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key
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* IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the
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* request 'user_data'
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* IORING_ASYNC_CANCEL_ANY Match any request
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* IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor
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*/
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#define IORING_ASYNC_CANCEL_ALL (1U << 0)
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#define IORING_ASYNC_CANCEL_FD (1U << 1)
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#define IORING_ASYNC_CANCEL_ANY (1U << 2)
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#define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3)
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/*
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* send/sendmsg and recv/recvmsg flags (sqe->ioprio)
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*
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* IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send
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* or receive and arm poll if that yields an
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* -EAGAIN result, arm poll upfront and skip
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* the initial transfer attempt.
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*
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* IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if
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* the handler will continue to report
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* CQEs on behalf of the same SQE.
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*
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* IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in
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* the buf_index field.
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*
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* IORING_SEND_ZC_REPORT_USAGE
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* If set, SEND[MSG]_ZC should report
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* the zerocopy usage in cqe.res
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* for the IORING_CQE_F_NOTIF cqe.
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* 0 is reported if zerocopy was actually possible.
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* IORING_NOTIF_USAGE_ZC_COPIED if data was copied
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* (at least partially).
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*/
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#define IORING_RECVSEND_POLL_FIRST (1U << 0)
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#define IORING_RECV_MULTISHOT (1U << 1)
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#define IORING_RECVSEND_FIXED_BUF (1U << 2)
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#define IORING_SEND_ZC_REPORT_USAGE (1U << 3)
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/*
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* cqe.res for IORING_CQE_F_NOTIF if
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* IORING_SEND_ZC_REPORT_USAGE was requested
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*
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* It should be treated as a flag, all other
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* bits of cqe.res should be treated as reserved!
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*/
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#define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31)
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/*
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* accept flags stored in sqe->ioprio
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*/
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#define IORING_ACCEPT_MULTISHOT (1U << 0)
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/*
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* IORING_OP_MSG_RING command types, stored in sqe->addr
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*/
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enum {
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IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */
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IORING_MSG_SEND_FD, /* send a registered fd to another ring */
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};
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/*
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* IORING_OP_MSG_RING flags (sqe->msg_ring_flags)
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*
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* IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not
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* applicable for IORING_MSG_DATA, obviously.
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*/
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#define IORING_MSG_RING_CQE_SKIP (1U << 0)
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/* Pass through the flags from sqe->file_index to cqe->flags */
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#define IORING_MSG_RING_FLAGS_PASS (1U << 1)
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/*
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* IO completion data structure (Completion Queue Entry)
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*/
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struct io_uring_cqe {
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__u64 user_data; /* sqe->data submission passed back */
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__s32 res; /* result code for this event */
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__u32 flags;
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/*
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* If the ring is initialized with IORING_SETUP_CQE32, then this field
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* contains 16-bytes of padding, doubling the size of the CQE.
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*/
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__u64 big_cqe[];
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};
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/*
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* cqe->flags
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*
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* IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID
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* IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries
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* IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv
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* IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct
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* them from sends.
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*/
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#define IORING_CQE_F_BUFFER (1U << 0)
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#define IORING_CQE_F_MORE (1U << 1)
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#define IORING_CQE_F_SOCK_NONEMPTY (1U << 2)
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#define IORING_CQE_F_NOTIF (1U << 3)
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enum {
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IORING_CQE_BUFFER_SHIFT = 16,
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};
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/*
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* Magic offsets for the application to mmap the data it needs
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*/
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#define IORING_OFF_SQ_RING 0ULL
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#define IORING_OFF_CQ_RING 0x8000000ULL
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#define IORING_OFF_SQES 0x10000000ULL
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#define IORING_OFF_PBUF_RING 0x80000000ULL
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#define IORING_OFF_PBUF_SHIFT 16
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#define IORING_OFF_MMAP_MASK 0xf8000000ULL
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/*
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* Filled with the offset for mmap(2)
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*/
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struct io_sqring_offsets {
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__u32 head;
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__u32 tail;
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__u32 ring_mask;
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__u32 ring_entries;
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__u32 flags;
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__u32 dropped;
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__u32 array;
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__u32 resv1;
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__u64 user_addr;
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};
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/*
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* sq_ring->flags
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*/
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#define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */
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#define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */
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#define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */
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struct io_cqring_offsets {
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__u32 head;
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__u32 tail;
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__u32 ring_mask;
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__u32 ring_entries;
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__u32 overflow;
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__u32 cqes;
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__u32 flags;
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__u32 resv1;
|
|
__u64 user_addr;
|
|
};
|
|
|
|
/*
|
|
* cq_ring->flags
|
|
*/
|
|
|
|
/* disable eventfd notifications */
|
|
#define IORING_CQ_EVENTFD_DISABLED (1U << 0)
|
|
|
|
/*
|
|
* io_uring_enter(2) flags
|
|
*/
|
|
#define IORING_ENTER_GETEVENTS (1U << 0)
|
|
#define IORING_ENTER_SQ_WAKEUP (1U << 1)
|
|
#define IORING_ENTER_SQ_WAIT (1U << 2)
|
|
#define IORING_ENTER_EXT_ARG (1U << 3)
|
|
#define IORING_ENTER_REGISTERED_RING (1U << 4)
|
|
|
|
/*
|
|
* Passed in for io_uring_setup(2). Copied back with updated info on success
|
|
*/
|
|
struct io_uring_params {
|
|
__u32 sq_entries;
|
|
__u32 cq_entries;
|
|
__u32 flags;
|
|
__u32 sq_thread_cpu;
|
|
__u32 sq_thread_idle;
|
|
__u32 features;
|
|
__u32 wq_fd;
|
|
__u32 resv[3];
|
|
struct io_sqring_offsets sq_off;
|
|
struct io_cqring_offsets cq_off;
|
|
};
|
|
|
|
/*
|
|
* io_uring_params->features flags
|
|
*/
|
|
#define IORING_FEAT_SINGLE_MMAP (1U << 0)
|
|
#define IORING_FEAT_NODROP (1U << 1)
|
|
#define IORING_FEAT_SUBMIT_STABLE (1U << 2)
|
|
#define IORING_FEAT_RW_CUR_POS (1U << 3)
|
|
#define IORING_FEAT_CUR_PERSONALITY (1U << 4)
|
|
#define IORING_FEAT_FAST_POLL (1U << 5)
|
|
#define IORING_FEAT_POLL_32BITS (1U << 6)
|
|
#define IORING_FEAT_SQPOLL_NONFIXED (1U << 7)
|
|
#define IORING_FEAT_EXT_ARG (1U << 8)
|
|
#define IORING_FEAT_NATIVE_WORKERS (1U << 9)
|
|
#define IORING_FEAT_RSRC_TAGS (1U << 10)
|
|
#define IORING_FEAT_CQE_SKIP (1U << 11)
|
|
#define IORING_FEAT_LINKED_FILE (1U << 12)
|
|
#define IORING_FEAT_REG_REG_RING (1U << 13)
|
|
|
|
/*
|
|
* io_uring_register(2) opcodes and arguments
|
|
*/
|
|
enum {
|
|
IORING_REGISTER_BUFFERS = 0,
|
|
IORING_UNREGISTER_BUFFERS = 1,
|
|
IORING_REGISTER_FILES = 2,
|
|
IORING_UNREGISTER_FILES = 3,
|
|
IORING_REGISTER_EVENTFD = 4,
|
|
IORING_UNREGISTER_EVENTFD = 5,
|
|
IORING_REGISTER_FILES_UPDATE = 6,
|
|
IORING_REGISTER_EVENTFD_ASYNC = 7,
|
|
IORING_REGISTER_PROBE = 8,
|
|
IORING_REGISTER_PERSONALITY = 9,
|
|
IORING_UNREGISTER_PERSONALITY = 10,
|
|
IORING_REGISTER_RESTRICTIONS = 11,
|
|
IORING_REGISTER_ENABLE_RINGS = 12,
|
|
|
|
/* extended with tagging */
|
|
IORING_REGISTER_FILES2 = 13,
|
|
IORING_REGISTER_FILES_UPDATE2 = 14,
|
|
IORING_REGISTER_BUFFERS2 = 15,
|
|
IORING_REGISTER_BUFFERS_UPDATE = 16,
|
|
|
|
/* set/clear io-wq thread affinities */
|
|
IORING_REGISTER_IOWQ_AFF = 17,
|
|
IORING_UNREGISTER_IOWQ_AFF = 18,
|
|
|
|
/* set/get max number of io-wq workers */
|
|
IORING_REGISTER_IOWQ_MAX_WORKERS = 19,
|
|
|
|
/* register/unregister io_uring fd with the ring */
|
|
IORING_REGISTER_RING_FDS = 20,
|
|
IORING_UNREGISTER_RING_FDS = 21,
|
|
|
|
/* register ring based provide buffer group */
|
|
IORING_REGISTER_PBUF_RING = 22,
|
|
IORING_UNREGISTER_PBUF_RING = 23,
|
|
|
|
/* sync cancelation API */
|
|
IORING_REGISTER_SYNC_CANCEL = 24,
|
|
|
|
/* register a range of fixed file slots for automatic slot allocation */
|
|
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
|
|
|
|
/* this goes last */
|
|
IORING_REGISTER_LAST,
|
|
|
|
/* flag added to the opcode to use a registered ring fd */
|
|
IORING_REGISTER_USE_REGISTERED_RING = 1U << 31
|
|
};
|
|
|
|
/* io-wq worker categories */
|
|
enum {
|
|
IO_WQ_BOUND,
|
|
IO_WQ_UNBOUND,
|
|
};
|
|
|
|
/* deprecated, see struct io_uring_rsrc_update */
|
|
struct io_uring_files_update {
|
|
__u32 offset;
|
|
__u32 resv;
|
|
__aligned_u64 /* __s32 * */ fds;
|
|
};
|
|
|
|
/*
|
|
* Register a fully sparse file space, rather than pass in an array of all
|
|
* -1 file descriptors.
|
|
*/
|
|
#define IORING_RSRC_REGISTER_SPARSE (1U << 0)
|
|
|
|
struct io_uring_rsrc_register {
|
|
__u32 nr;
|
|
__u32 flags;
|
|
__u64 resv2;
|
|
__aligned_u64 data;
|
|
__aligned_u64 tags;
|
|
};
|
|
|
|
struct io_uring_rsrc_update {
|
|
__u32 offset;
|
|
__u32 resv;
|
|
__aligned_u64 data;
|
|
};
|
|
|
|
struct io_uring_rsrc_update2 {
|
|
__u32 offset;
|
|
__u32 resv;
|
|
__aligned_u64 data;
|
|
__aligned_u64 tags;
|
|
__u32 nr;
|
|
__u32 resv2;
|
|
};
|
|
|
|
/* Skip updating fd indexes set to this value in the fd table */
|
|
#define IORING_REGISTER_FILES_SKIP (-2)
|
|
|
|
#define IO_URING_OP_SUPPORTED (1U << 0)
|
|
|
|
struct io_uring_probe_op {
|
|
__u8 op;
|
|
__u8 resv;
|
|
__u16 flags; /* IO_URING_OP_* flags */
|
|
__u32 resv2;
|
|
};
|
|
|
|
struct io_uring_probe {
|
|
__u8 last_op; /* last opcode supported */
|
|
__u8 ops_len; /* length of ops[] array below */
|
|
__u16 resv;
|
|
__u32 resv2[3];
|
|
struct io_uring_probe_op ops[];
|
|
};
|
|
|
|
struct io_uring_restriction {
|
|
__u16 opcode;
|
|
union {
|
|
__u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */
|
|
__u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */
|
|
__u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */
|
|
};
|
|
__u8 resv;
|
|
__u32 resv2[3];
|
|
};
|
|
|
|
struct io_uring_buf {
|
|
__u64 addr;
|
|
__u32 len;
|
|
__u16 bid;
|
|
__u16 resv;
|
|
};
|
|
|
|
struct io_uring_buf_ring {
|
|
union {
|
|
/*
|
|
* To avoid spilling into more pages than we need to, the
|
|
* ring tail is overlaid with the io_uring_buf->resv field.
|
|
*/
|
|
struct {
|
|
__u64 resv1;
|
|
__u32 resv2;
|
|
__u16 resv3;
|
|
__u16 tail;
|
|
};
|
|
__DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs);
|
|
};
|
|
};
|
|
|
|
/*
|
|
* Flags for IORING_REGISTER_PBUF_RING.
|
|
*
|
|
* IOU_PBUF_RING_MMAP: If set, kernel will allocate the memory for the ring.
|
|
* The application must not set a ring_addr in struct
|
|
* io_uring_buf_reg, instead it must subsequently call
|
|
* mmap(2) with the offset set as:
|
|
* IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT)
|
|
* to get a virtual mapping for the ring.
|
|
*/
|
|
enum {
|
|
IOU_PBUF_RING_MMAP = 1,
|
|
};
|
|
|
|
/* argument for IORING_(UN)REGISTER_PBUF_RING */
|
|
struct io_uring_buf_reg {
|
|
__u64 ring_addr;
|
|
__u32 ring_entries;
|
|
__u16 bgid;
|
|
__u16 flags;
|
|
__u64 resv[3];
|
|
};
|
|
|
|
/*
|
|
* io_uring_restriction->opcode values
|
|
*/
|
|
enum {
|
|
/* Allow an io_uring_register(2) opcode */
|
|
IORING_RESTRICTION_REGISTER_OP = 0,
|
|
|
|
/* Allow an sqe opcode */
|
|
IORING_RESTRICTION_SQE_OP = 1,
|
|
|
|
/* Allow sqe flags */
|
|
IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2,
|
|
|
|
/* Require sqe flags (these flags must be set on each submission) */
|
|
IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3,
|
|
|
|
IORING_RESTRICTION_LAST
|
|
};
|
|
|
|
struct io_uring_getevents_arg {
|
|
__u64 sigmask;
|
|
__u32 sigmask_sz;
|
|
__u32 pad;
|
|
__u64 ts;
|
|
};
|
|
|
|
/*
|
|
* Argument for IORING_REGISTER_SYNC_CANCEL
|
|
*/
|
|
struct io_uring_sync_cancel_reg {
|
|
__u64 addr;
|
|
__s32 fd;
|
|
__u32 flags;
|
|
struct __kernel_timespec timeout;
|
|
__u64 pad[4];
|
|
};
|
|
|
|
/*
|
|
* Argument for IORING_REGISTER_FILE_ALLOC_RANGE
|
|
* The range is specified as [off, off + len)
|
|
*/
|
|
struct io_uring_file_index_range {
|
|
__u32 off;
|
|
__u32 len;
|
|
__u64 resv;
|
|
};
|
|
|
|
struct io_uring_recvmsg_out {
|
|
__u32 namelen;
|
|
__u32 controllen;
|
|
__u32 payloadlen;
|
|
__u32 flags;
|
|
};
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|