1 /* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
3 * Header file for the io_uring interface.
5 * Copyright (C) 2019 Jens Axboe
6 * Copyright (C) 2019 Christoph Hellwig
8 #ifndef LINUX_IO_URING_H
9 #define LINUX_IO_URING_H
12 #include <linux/types.h>
14 * this file is shared with liburing and that has to autodetect
15 * if linux/time_types.h is available or not, it can
16 * define UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
17 * if linux/time_types.h is not available
19 #ifndef UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H
20 #include <linux/time_types.h>
28 * IO submission data structure (Submission Queue Entry)
31 __u8 opcode; /* type of operation for this sqe */
32 __u8 flags; /* IOSQE_ flags */
33 __u16 ioprio; /* ioprio for the request */
34 __s32 fd; /* file descriptor to do IO on */
36 __u64 off; /* offset into file */
44 __u64 addr; /* pointer to buffer or iovecs */
51 __u32 len; /* buffer size or number of iovecs */
53 __kernel_rwf_t rw_flags;
55 __u16 poll_events; /* compatibility */
56 __u32 poll32_events; /* word-reversed for BE */
57 __u32 sync_range_flags;
71 __u32 uring_cmd_flags;
74 __u32 install_fd_flags;
78 __u64 user_data; /* data to be passed back at completion time */
79 /* pack this to avoid bogus arm OABI complaints */
81 /* index into fixed buffers, if used */
83 /* for grouped buffer selection */
85 } __attribute__((packed));
86 /* personality to use, if used */
108 __u64 attr_ptr; /* pointer to attribute information */
109 __u64 attr_type_mask; /* bit mask of attributes */
113 * If the ring is initialized with IORING_SETUP_SQE128, then
114 * this field is used for 80 bytes of arbitrary command data
120 /* sqe->attr_type_mask flags */
121 #define IORING_RW_ATTR_FLAG_PI (1U << 0)
122 /* PI attribute information */
123 struct io_uring_attr_pi {
133 * If sqe->file_index is set to this for opcodes that instantiate a new
134 * direct descriptor (like openat/openat2/accept), then io_uring will allocate
135 * an available direct descriptor instead of having the application pass one
136 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE
137 * if the space is full.
139 #define IORING_FILE_INDEX_ALLOC (~0U)
141 enum io_uring_sqe_flags_bit {
142 IOSQE_FIXED_FILE_BIT,
145 IOSQE_IO_HARDLINK_BIT,
147 IOSQE_BUFFER_SELECT_BIT,
148 IOSQE_CQE_SKIP_SUCCESS_BIT,
154 /* use fixed fileset */
155 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT)
156 /* issue after inflight IO */
157 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT)
159 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT)
160 /* like LINK, but stronger */
161 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT)
162 /* always go async */
163 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT)
164 /* select buffer from sqe->buf_group */
165 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT)
166 /* don't post CQE if request succeeded */
167 #define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT)
170 * io_uring_setup() flags
172 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */
173 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */
174 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */
175 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */
176 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */
177 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */
178 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */
179 #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */
181 * Cooperative task running. When requests complete, they often require
182 * forcing the submitter to transition to the kernel to complete. If this
183 * flag is set, work will be done when the task transitions anyway, rather
184 * than force an inter-processor interrupt reschedule. This avoids interrupting
185 * a task running in userspace, and saves an IPI.
187 #define IORING_SETUP_COOP_TASKRUN (1U << 8)
189 * If COOP_TASKRUN is set, get notified if task work is available for
190 * running and a kernel transition would be needed to run it. This sets
191 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
193 #define IORING_SETUP_TASKRUN_FLAG (1U << 9)
194 #define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */
195 #define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */
197 * Only one task is allowed to submit requests
199 #define IORING_SETUP_SINGLE_ISSUER (1U << 12)
202 * Defer running task work to get events.
203 * Rather than running bits of task work whenever the task transitions
204 * try to do it just before it is needed.
206 #define IORING_SETUP_DEFER_TASKRUN (1U << 13)
209 * Application provides the memory for the rings
211 #define IORING_SETUP_NO_MMAP (1U << 14)
214 * Register the ring fd in itself for use with
215 * IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather
218 #define IORING_SETUP_REGISTERED_FD_ONLY (1U << 15)
221 * Removes indirection through the SQ index array.
223 #define IORING_SETUP_NO_SQARRAY (1U << 16)
225 /* Use hybrid poll in iopoll process */
226 #define IORING_SETUP_HYBRID_IOPOLL (1U << 17)
233 IORING_OP_READ_FIXED,
234 IORING_OP_WRITE_FIXED,
236 IORING_OP_POLL_REMOVE,
237 IORING_OP_SYNC_FILE_RANGE,
241 IORING_OP_TIMEOUT_REMOVE,
243 IORING_OP_ASYNC_CANCEL,
244 IORING_OP_LINK_TIMEOUT,
249 IORING_OP_FILES_UPDATE,
260 IORING_OP_PROVIDE_BUFFERS,
261 IORING_OP_REMOVE_BUFFERS,
277 IORING_OP_SENDMSG_ZC,
278 IORING_OP_READ_MULTISHOT,
280 IORING_OP_FUTEX_WAIT,
281 IORING_OP_FUTEX_WAKE,
282 IORING_OP_FUTEX_WAITV,
283 IORING_OP_FIXED_FD_INSTALL,
288 IORING_OP_EPOLL_WAIT,
289 IORING_OP_READV_FIXED,
290 IORING_OP_WRITEV_FIXED,
293 /* this goes last, obviously */
298 * sqe->uring_cmd_flags top 8bits aren't available for userspace
299 * IORING_URING_CMD_FIXED use registered buffer; pass this flag
300 * along with setting sqe->buf_index.
302 #define IORING_URING_CMD_FIXED (1U << 0)
303 #define IORING_URING_CMD_MASK IORING_URING_CMD_FIXED
309 #define IORING_FSYNC_DATASYNC (1U << 0)
314 #define IORING_TIMEOUT_ABS (1U << 0)
315 #define IORING_TIMEOUT_UPDATE (1U << 1)
316 #define IORING_TIMEOUT_BOOTTIME (1U << 2)
317 #define IORING_TIMEOUT_REALTIME (1U << 3)
318 #define IORING_LINK_TIMEOUT_UPDATE (1U << 4)
319 #define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5)
320 #define IORING_TIMEOUT_MULTISHOT (1U << 6)
321 #define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
322 #define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
325 * extends splice(2) flags
327 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */
330 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the
331 * command flags for POLL_ADD are stored in sqe->len.
333 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if
334 * the poll handler will continue to report
335 * CQEs on behalf of the same SQE.
337 * IORING_POLL_UPDATE Update existing poll request, matching
338 * sqe->addr as the old user_data field.
340 * IORING_POLL_LEVEL Level triggered poll.
342 #define IORING_POLL_ADD_MULTI (1U << 0)
343 #define IORING_POLL_UPDATE_EVENTS (1U << 1)
344 #define IORING_POLL_UPDATE_USER_DATA (1U << 2)
345 #define IORING_POLL_ADD_LEVEL (1U << 3)
348 * ASYNC_CANCEL flags.
350 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key
351 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the
352 * request 'user_data'
353 * IORING_ASYNC_CANCEL_ANY Match any request
354 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor
355 * IORING_ASYNC_CANCEL_USERDATA Match on user_data, default for no other key
356 * IORING_ASYNC_CANCEL_OP Match request based on opcode
358 #define IORING_ASYNC_CANCEL_ALL (1U << 0)
359 #define IORING_ASYNC_CANCEL_FD (1U << 1)
360 #define IORING_ASYNC_CANCEL_ANY (1U << 2)
361 #define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3)
362 #define IORING_ASYNC_CANCEL_USERDATA (1U << 4)
363 #define IORING_ASYNC_CANCEL_OP (1U << 5)
366 * send/sendmsg and recv/recvmsg flags (sqe->ioprio)
368 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send
369 * or receive and arm poll if that yields an
370 * -EAGAIN result, arm poll upfront and skip
371 * the initial transfer attempt.
373 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if
374 * the handler will continue to report
375 * CQEs on behalf of the same SQE.
377 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in
378 * the buf_index field.
380 * IORING_SEND_ZC_REPORT_USAGE
381 * If set, SEND[MSG]_ZC should report
382 * the zerocopy usage in cqe.res
383 * for the IORING_CQE_F_NOTIF cqe.
384 * 0 is reported if zerocopy was actually possible.
385 * IORING_NOTIF_USAGE_ZC_COPIED if data was copied
386 * (at least partially).
388 * IORING_RECVSEND_BUNDLE Used with IOSQE_BUFFER_SELECT. If set, send or
389 * recv will grab as many buffers from the buffer
390 * group ID given and send them all. The completion
391 * result will be the number of buffers send, with
392 * the starting buffer ID in cqe->flags as per
393 * usual for provided buffer usage. The buffers
394 * will be contiguous from the starting buffer ID.
396 #define IORING_RECVSEND_POLL_FIRST (1U << 0)
397 #define IORING_RECV_MULTISHOT (1U << 1)
398 #define IORING_RECVSEND_FIXED_BUF (1U << 2)
399 #define IORING_SEND_ZC_REPORT_USAGE (1U << 3)
400 #define IORING_RECVSEND_BUNDLE (1U << 4)
403 * cqe.res for IORING_CQE_F_NOTIF if
404 * IORING_SEND_ZC_REPORT_USAGE was requested
406 * It should be treated as a flag, all other
407 * bits of cqe.res should be treated as reserved!
409 #define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31)
412 * accept flags stored in sqe->ioprio
414 #define IORING_ACCEPT_MULTISHOT (1U << 0)
415 #define IORING_ACCEPT_DONTWAIT (1U << 1)
416 #define IORING_ACCEPT_POLL_FIRST (1U << 2)
419 * IORING_OP_MSG_RING command types, stored in sqe->addr
421 enum io_uring_msg_ring_flags {
422 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */
423 IORING_MSG_SEND_FD, /* send a registered fd to another ring */
427 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags)
429 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not
430 * applicable for IORING_MSG_DATA, obviously.
432 #define IORING_MSG_RING_CQE_SKIP (1U << 0)
433 /* Pass through the flags from sqe->file_index to cqe->flags */
434 #define IORING_MSG_RING_FLAGS_PASS (1U << 1)
437 * IORING_OP_FIXED_FD_INSTALL flags (sqe->install_fd_flags)
439 * IORING_FIXED_FD_NO_CLOEXEC Don't mark the fd as O_CLOEXEC
441 #define IORING_FIXED_FD_NO_CLOEXEC (1U << 0)
444 * IORING_OP_NOP flags (sqe->nop_flags)
446 * IORING_NOP_INJECT_RESULT Inject result from sqe->result
448 #define IORING_NOP_INJECT_RESULT (1U << 0)
449 #define IORING_NOP_FILE (1U << 1)
450 #define IORING_NOP_FIXED_FILE (1U << 2)
451 #define IORING_NOP_FIXED_BUFFER (1U << 3)
454 * IO completion data structure (Completion Queue Entry)
456 struct io_uring_cqe {
457 __u64 user_data; /* sqe->user_data value passed back */
458 __s32 res; /* result code for this event */
462 * If the ring is initialized with IORING_SETUP_CQE32, then this field
463 * contains 16-bytes of padding, doubling the size of the CQE.
471 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID
472 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries
473 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv
474 * IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct
476 * IORING_CQE_F_BUF_MORE If set, the buffer ID set in the completion will get
477 * more completions. In other words, the buffer is being
478 * partially consumed, and will be used by the kernel for
479 * more completions. This is only set for buffers used via
480 * the incremental buffer consumption, as provided by
481 * a ring buffer setup with IOU_PBUF_RING_INC. For any
482 * other provided buffer type, all completions with a
483 * buffer passed back is automatically returned to the
486 #define IORING_CQE_F_BUFFER (1U << 0)
487 #define IORING_CQE_F_MORE (1U << 1)
488 #define IORING_CQE_F_SOCK_NONEMPTY (1U << 2)
489 #define IORING_CQE_F_NOTIF (1U << 3)
490 #define IORING_CQE_F_BUF_MORE (1U << 4)
492 #define IORING_CQE_BUFFER_SHIFT 16
495 * Magic offsets for the application to mmap the data it needs
497 #define IORING_OFF_SQ_RING 0ULL
498 #define IORING_OFF_CQ_RING 0x8000000ULL
499 #define IORING_OFF_SQES 0x10000000ULL
500 #define IORING_OFF_PBUF_RING 0x80000000ULL
501 #define IORING_OFF_PBUF_SHIFT 16
502 #define IORING_OFF_MMAP_MASK 0xf8000000ULL
505 * Filled with the offset for mmap(2)
507 struct io_sqring_offsets {
522 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */
523 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */
524 #define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */
526 struct io_cqring_offsets {
542 /* disable eventfd notifications */
543 #define IORING_CQ_EVENTFD_DISABLED (1U << 0)
546 * io_uring_enter(2) flags
548 #define IORING_ENTER_GETEVENTS (1U << 0)
549 #define IORING_ENTER_SQ_WAKEUP (1U << 1)
550 #define IORING_ENTER_SQ_WAIT (1U << 2)
551 #define IORING_ENTER_EXT_ARG (1U << 3)
552 #define IORING_ENTER_REGISTERED_RING (1U << 4)
553 #define IORING_ENTER_ABS_TIMER (1U << 5)
554 #define IORING_ENTER_EXT_ARG_REG (1U << 6)
555 #define IORING_ENTER_NO_IOWAIT (1U << 7)
558 * Passed in for io_uring_setup(2). Copied back with updated info on success
560 struct io_uring_params {
565 __u32 sq_thread_idle;
569 struct io_sqring_offsets sq_off;
570 struct io_cqring_offsets cq_off;
574 * io_uring_params->features flags
576 #define IORING_FEAT_SINGLE_MMAP (1U << 0)
577 #define IORING_FEAT_NODROP (1U << 1)
578 #define IORING_FEAT_SUBMIT_STABLE (1U << 2)
579 #define IORING_FEAT_RW_CUR_POS (1U << 3)
580 #define IORING_FEAT_CUR_PERSONALITY (1U << 4)
581 #define IORING_FEAT_FAST_POLL (1U << 5)
582 #define IORING_FEAT_POLL_32BITS (1U << 6)
583 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7)
584 #define IORING_FEAT_EXT_ARG (1U << 8)
585 #define IORING_FEAT_NATIVE_WORKERS (1U << 9)
586 #define IORING_FEAT_RSRC_TAGS (1U << 10)
587 #define IORING_FEAT_CQE_SKIP (1U << 11)
588 #define IORING_FEAT_LINKED_FILE (1U << 12)
589 #define IORING_FEAT_REG_REG_RING (1U << 13)
590 #define IORING_FEAT_RECVSEND_BUNDLE (1U << 14)
591 #define IORING_FEAT_MIN_TIMEOUT (1U << 15)
592 #define IORING_FEAT_RW_ATTR (1U << 16)
593 #define IORING_FEAT_NO_IOWAIT (1U << 17)
596 * io_uring_register(2) opcodes and arguments
598 enum io_uring_register_op {
599 IORING_REGISTER_BUFFERS = 0,
600 IORING_UNREGISTER_BUFFERS = 1,
601 IORING_REGISTER_FILES = 2,
602 IORING_UNREGISTER_FILES = 3,
603 IORING_REGISTER_EVENTFD = 4,
604 IORING_UNREGISTER_EVENTFD = 5,
605 IORING_REGISTER_FILES_UPDATE = 6,
606 IORING_REGISTER_EVENTFD_ASYNC = 7,
607 IORING_REGISTER_PROBE = 8,
608 IORING_REGISTER_PERSONALITY = 9,
609 IORING_UNREGISTER_PERSONALITY = 10,
610 IORING_REGISTER_RESTRICTIONS = 11,
611 IORING_REGISTER_ENABLE_RINGS = 12,
613 /* extended with tagging */
614 IORING_REGISTER_FILES2 = 13,
615 IORING_REGISTER_FILES_UPDATE2 = 14,
616 IORING_REGISTER_BUFFERS2 = 15,
617 IORING_REGISTER_BUFFERS_UPDATE = 16,
619 /* set/clear io-wq thread affinities */
620 IORING_REGISTER_IOWQ_AFF = 17,
621 IORING_UNREGISTER_IOWQ_AFF = 18,
623 /* set/get max number of io-wq workers */
624 IORING_REGISTER_IOWQ_MAX_WORKERS = 19,
626 /* register/unregister io_uring fd with the ring */
627 IORING_REGISTER_RING_FDS = 20,
628 IORING_UNREGISTER_RING_FDS = 21,
630 /* register ring based provide buffer group */
631 IORING_REGISTER_PBUF_RING = 22,
632 IORING_UNREGISTER_PBUF_RING = 23,
634 /* sync cancelation API */
635 IORING_REGISTER_SYNC_CANCEL = 24,
637 /* register a range of fixed file slots for automatic slot allocation */
638 IORING_REGISTER_FILE_ALLOC_RANGE = 25,
640 /* return status information for a buffer group */
641 IORING_REGISTER_PBUF_STATUS = 26,
643 /* set/clear busy poll settings */
644 IORING_REGISTER_NAPI = 27,
645 IORING_UNREGISTER_NAPI = 28,
647 IORING_REGISTER_CLOCK = 29,
649 /* clone registered buffers from source ring to current ring */
650 IORING_REGISTER_CLONE_BUFFERS = 30,
652 /* send MSG_RING without having a ring */
653 IORING_REGISTER_SEND_MSG_RING = 31,
655 /* register a netdev hw rx queue for zerocopy */
656 IORING_REGISTER_ZCRX_IFQ = 32,
659 IORING_REGISTER_RESIZE_RINGS = 33,
661 IORING_REGISTER_MEM_REGION = 34,
664 IORING_REGISTER_LAST,
666 /* flag added to the opcode to use a registered ring fd */
667 IORING_REGISTER_USE_REGISTERED_RING = 1U << 31
670 /* io-wq worker categories */
676 /* deprecated, see struct io_uring_rsrc_update */
677 struct io_uring_files_update {
680 __aligned_u64 /* __s32 * */ fds;
684 /* initialise with user provided memory pointed by user_addr */
685 IORING_MEM_REGION_TYPE_USER = 1,
688 struct io_uring_region_desc {
698 /* expose the region as registered wait arguments */
699 IORING_MEM_REGION_REG_WAIT_ARG = 1,
702 struct io_uring_mem_region_reg {
703 __u64 region_uptr; /* struct io_uring_region_desc * */
709 * Register a fully sparse file space, rather than pass in an array of all
710 * -1 file descriptors.
712 #define IORING_RSRC_REGISTER_SPARSE (1U << 0)
714 struct io_uring_rsrc_register {
722 struct io_uring_rsrc_update {
728 struct io_uring_rsrc_update2 {
737 /* Skip updating fd indexes set to this value in the fd table */
738 #define IORING_REGISTER_FILES_SKIP (-2)
740 #define IO_URING_OP_SUPPORTED (1U << 0)
742 struct io_uring_probe_op {
745 __u16 flags; /* IO_URING_OP_* flags */
749 struct io_uring_probe {
750 __u8 last_op; /* last opcode supported */
751 __u8 ops_len; /* length of ops[] array below */
754 struct io_uring_probe_op ops[];
757 struct io_uring_restriction {
760 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */
761 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */
762 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */
768 struct io_uring_clock_register {
774 IORING_REGISTER_SRC_REGISTERED = (1U << 0),
775 IORING_REGISTER_DST_REPLACE = (1U << 1),
778 struct io_uring_clone_buffers {
787 struct io_uring_buf {
794 struct io_uring_buf_ring {
797 * To avoid spilling into more pages than we need to, the
798 * ring tail is overlaid with the io_uring_buf->resv field.
806 __DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs);
811 * Flags for IORING_REGISTER_PBUF_RING.
813 * IOU_PBUF_RING_MMAP: If set, kernel will allocate the memory for the ring.
814 * The application must not set a ring_addr in struct
815 * io_uring_buf_reg, instead it must subsequently call
816 * mmap(2) with the offset set as:
817 * IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT)
818 * to get a virtual mapping for the ring.
819 * IOU_PBUF_RING_INC: If set, buffers consumed from this buffer ring can be
820 * consumed incrementally. Normally one (or more) buffers
821 * are fully consumed. With incremental consumptions, it's
822 * feasible to register big ranges of buffers, and each
823 * use of it will consume only as much as it needs. This
824 * requires that both the kernel and application keep
825 * track of where the current read/recv index is at.
827 enum io_uring_register_pbuf_ring_flags {
828 IOU_PBUF_RING_MMAP = 1,
829 IOU_PBUF_RING_INC = 2,
832 /* argument for IORING_(UN)REGISTER_PBUF_RING */
833 struct io_uring_buf_reg {
841 /* argument for IORING_REGISTER_PBUF_STATUS */
842 struct io_uring_buf_status {
843 __u32 buf_group; /* input */
844 __u32 head; /* output */
848 enum io_uring_napi_op {
849 /* register/ungister backward compatible opcode */
850 IO_URING_NAPI_REGISTER_OP = 0,
852 /* opcodes to update napi_list when static tracking is used */
853 IO_URING_NAPI_STATIC_ADD_ID = 1,
854 IO_URING_NAPI_STATIC_DEL_ID = 2
857 enum io_uring_napi_tracking_strategy {
858 /* value must be 0 for backward compatibility */
859 IO_URING_NAPI_TRACKING_DYNAMIC = 0,
860 IO_URING_NAPI_TRACKING_STATIC = 1,
861 IO_URING_NAPI_TRACKING_INACTIVE = 255
864 /* argument for IORING_(UN)REGISTER_NAPI */
865 struct io_uring_napi {
867 __u8 prefer_busy_poll;
869 /* a io_uring_napi_op value */
874 * for IO_URING_NAPI_REGISTER_OP, it is a
875 * io_uring_napi_tracking_strategy value.
877 * for IO_URING_NAPI_STATIC_ADD_ID/IO_URING_NAPI_STATIC_DEL_ID
878 * it is the napi id to add/del from napi_list.
885 * io_uring_restriction->opcode values
887 enum io_uring_register_restriction_op {
888 /* Allow an io_uring_register(2) opcode */
889 IORING_RESTRICTION_REGISTER_OP = 0,
891 /* Allow an sqe opcode */
892 IORING_RESTRICTION_SQE_OP = 1,
894 /* Allow sqe flags */
895 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2,
897 /* Require sqe flags (these flags must be set on each submission) */
898 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3,
900 IORING_RESTRICTION_LAST
904 IORING_REG_WAIT_TS = (1U << 0),
908 * Argument for io_uring_enter(2) with
909 * IORING_GETEVENTS | IORING_ENTER_EXT_ARG_REG set, where the actual argument
910 * is an index into a previously registered fixed wait region described by
911 * the below structure.
913 struct io_uring_reg_wait {
914 struct __kernel_timespec ts;
924 * Argument for io_uring_enter(2) with IORING_GETEVENTS | IORING_ENTER_EXT_ARG
926 struct io_uring_getevents_arg {
934 * Argument for IORING_REGISTER_SYNC_CANCEL
936 struct io_uring_sync_cancel_reg {
940 struct __kernel_timespec timeout;
947 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE
948 * The range is specified as [off, off + len)
950 struct io_uring_file_index_range {
956 struct io_uring_recvmsg_out {
964 * Argument for IORING_OP_URING_CMD when file is a socket
966 enum io_uring_socket_op {
967 SOCKET_URING_OP_SIOCINQ = 0,
968 SOCKET_URING_OP_SIOCOUTQ,
969 SOCKET_URING_OP_GETSOCKOPT,
970 SOCKET_URING_OP_SETSOCKOPT,
973 /* Zero copy receive refill queue entry */
974 struct io_uring_zcrx_rqe {
980 struct io_uring_zcrx_cqe {
985 /* The bit from which area id is encoded into offsets */
986 #define IORING_ZCRX_AREA_SHIFT 48
987 #define IORING_ZCRX_AREA_MASK (~(((__u64)1 << IORING_ZCRX_AREA_SHIFT) - 1))
989 struct io_uring_zcrx_offsets {
997 enum io_uring_zcrx_area_flags {
998 IORING_ZCRX_AREA_DMABUF = 1,
1001 struct io_uring_zcrx_area_reg {
1004 __u64 rq_area_token;
1011 * Argument for IORING_REGISTER_ZCRX_IFQ
1013 struct io_uring_zcrx_ifq_reg {
1019 __u64 area_ptr; /* pointer to struct io_uring_zcrx_area_reg */
1020 __u64 region_ptr; /* struct io_uring_region_desc * */
1022 struct io_uring_zcrx_offsets offsets;