1/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */ 2/* 3 * Header file for the io_uring interface. 4 * 5 * Copyright (C) 2019 Jens Axboe 6 * Copyright (C) 2019 Christoph Hellwig 7 */ 8#ifndef LINUX_IO_URING_H 9#define LINUX_IO_URING_H 10 11#include <linux/fs.h> 12#include <linux/types.h> 13/* 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 18 */ 19#ifndef UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H 20#include <linux/time_types.h> 21#endif 22 23#ifdef __cplusplus 24extern "C" { 25#endif 26 27/* 28 * IO submission data structure (Submission Queue Entry) 29 */ 30struct io_uring_sqe { 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 */ 35 union { 36 __u64 off; /* offset into file */ 37 __u64 addr2; 38 struct { 39 __u32 cmd_op; 40 __u32 __pad1; 41 }; 42 }; 43 union { 44 __u64 addr; /* pointer to buffer or iovecs */ 45 __u64 splice_off_in; 46 struct { 47 __u32 level; 48 __u32 optname; 49 }; 50 }; 51 __u32 len; /* buffer size or number of iovecs */ 52 union { 53 __kernel_rwf_t rw_flags; 54 __u32 fsync_flags; 55 __u16 poll_events; /* compatibility */ 56 __u32 poll32_events; /* word-reversed for BE */ 57 __u32 sync_range_flags; 58 __u32 msg_flags; 59 __u32 timeout_flags; 60 __u32 accept_flags; 61 __u32 cancel_flags; 62 __u32 open_flags; 63 __u32 statx_flags; 64 __u32 fadvise_advice; 65 __u32 splice_flags; 66 __u32 rename_flags; 67 __u32 unlink_flags; 68 __u32 hardlink_flags; 69 __u32 xattr_flags; 70 __u32 msg_ring_flags; 71 __u32 uring_cmd_flags; 72 __u32 waitid_flags; 73 __u32 futex_flags; 74 }; 75 __u64 user_data; /* data to be passed back at completion time */ 76 /* pack this to avoid bogus arm OABI complaints */ 77 union { 78 /* index into fixed buffers, if used */ 79 __u16 buf_index; 80 /* for grouped buffer selection */ 81 __u16 buf_group; 82 } __attribute__((packed)); 83 /* personality to use, if used */ 84 __u16 personality; 85 union { 86 __s32 splice_fd_in; 87 __u32 file_index; 88 __u32 optlen; 89 struct { 90 __u16 addr_len; 91 __u16 __pad3[1]; 92 }; 93 }; 94 union { 95 struct { 96 __u64 addr3; 97 __u64 __pad2[1]; 98 }; 99 __u64 optval; 100 /* 101 * If the ring is initialized with IORING_SETUP_SQE128, then 102 * this field is used for 80 bytes of arbitrary command data 103 */ 104 __u8 cmd[0]; 105 }; 106}; 107 108/* 109 * If sqe->file_index is set to this for opcodes that instantiate a new 110 * direct descriptor (like openat/openat2/accept), then io_uring will allocate 111 * an available direct descriptor instead of having the application pass one 112 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE 113 * if the space is full. 114 */ 115#define IORING_FILE_INDEX_ALLOC (~0U) 116 117enum { 118 IOSQE_FIXED_FILE_BIT, 119 IOSQE_IO_DRAIN_BIT, 120 IOSQE_IO_LINK_BIT, 121 IOSQE_IO_HARDLINK_BIT, 122 IOSQE_ASYNC_BIT, 123 IOSQE_BUFFER_SELECT_BIT, 124 IOSQE_CQE_SKIP_SUCCESS_BIT, 125}; 126 127/* 128 * sqe->flags 129 */ 130/* use fixed fileset */ 131#define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 132/* issue after inflight IO */ 133#define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 134/* links next sqe */ 135#define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 136/* like LINK, but stronger */ 137#define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 138/* always go async */ 139#define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 140/* select buffer from sqe->buf_group */ 141#define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 142/* don't post CQE if request succeeded */ 143#define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT) 144 145/* 146 * io_uring_setup() flags 147 */ 148#define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 149#define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 150#define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 151#define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 152#define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 153#define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 154#define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 155#define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */ 156/* 157 * Cooperative task running. When requests complete, they often require 158 * forcing the submitter to transition to the kernel to complete. If this 159 * flag is set, work will be done when the task transitions anyway, rather 160 * than force an inter-processor interrupt reschedule. This avoids interrupting 161 * a task running in userspace, and saves an IPI. 162 */ 163#define IORING_SETUP_COOP_TASKRUN (1U << 8) 164/* 165 * If COOP_TASKRUN is set, get notified if task work is available for 166 * running and a kernel transition would be needed to run it. This sets 167 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. 168 */ 169#define IORING_SETUP_TASKRUN_FLAG (1U << 9) 170#define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ 171#define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */ 172/* 173 * Only one task is allowed to submit requests 174 */ 175#define IORING_SETUP_SINGLE_ISSUER (1U << 12) 176 177/* 178 * Defer running task work to get events. 179 * Rather than running bits of task work whenever the task transitions 180 * try to do it just before it is needed. 181 */ 182#define IORING_SETUP_DEFER_TASKRUN (1U << 13) 183 184/* 185 * Application provides the memory for the rings 186 */ 187#define IORING_SETUP_NO_MMAP (1U << 14) 188 189/* 190 * Register the ring fd in itself for use with 191 * IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather 192 * than an fd. 193 */ 194#define IORING_SETUP_REGISTERED_FD_ONLY (1U << 15) 195 196/* 197 * Removes indirection through the SQ index array. 198 */ 199#define IORING_SETUP_NO_SQARRAY (1U << 16) 200 201enum io_uring_op { 202 IORING_OP_NOP, 203 IORING_OP_READV, 204 IORING_OP_WRITEV, 205 IORING_OP_FSYNC, 206 IORING_OP_READ_FIXED, 207 IORING_OP_WRITE_FIXED, 208 IORING_OP_POLL_ADD, 209 IORING_OP_POLL_REMOVE, 210 IORING_OP_SYNC_FILE_RANGE, 211 IORING_OP_SENDMSG, 212 IORING_OP_RECVMSG, 213 IORING_OP_TIMEOUT, 214 IORING_OP_TIMEOUT_REMOVE, 215 IORING_OP_ACCEPT, 216 IORING_OP_ASYNC_CANCEL, 217 IORING_OP_LINK_TIMEOUT, 218 IORING_OP_CONNECT, 219 IORING_OP_FALLOCATE, 220 IORING_OP_OPENAT, 221 IORING_OP_CLOSE, 222 IORING_OP_FILES_UPDATE, 223 IORING_OP_STATX, 224 IORING_OP_READ, 225 IORING_OP_WRITE, 226 IORING_OP_FADVISE, 227 IORING_OP_MADVISE, 228 IORING_OP_SEND, 229 IORING_OP_RECV, 230 IORING_OP_OPENAT2, 231 IORING_OP_EPOLL_CTL, 232 IORING_OP_SPLICE, 233 IORING_OP_PROVIDE_BUFFERS, 234 IORING_OP_REMOVE_BUFFERS, 235 IORING_OP_TEE, 236 IORING_OP_SHUTDOWN, 237 IORING_OP_RENAMEAT, 238 IORING_OP_UNLINKAT, 239 IORING_OP_MKDIRAT, 240 IORING_OP_SYMLINKAT, 241 IORING_OP_LINKAT, 242 IORING_OP_MSG_RING, 243 IORING_OP_FSETXATTR, 244 IORING_OP_SETXATTR, 245 IORING_OP_FGETXATTR, 246 IORING_OP_GETXATTR, 247 IORING_OP_SOCKET, 248 IORING_OP_URING_CMD, 249 IORING_OP_SEND_ZC, 250 IORING_OP_SENDMSG_ZC, 251 IORING_OP_READ_MULTISHOT, 252 IORING_OP_WAITID, 253 IORING_OP_FUTEX_WAIT, 254 IORING_OP_FUTEX_WAKE, 255 IORING_OP_FUTEX_WAITV, 256 257 /* this goes last, obviously */ 258 IORING_OP_LAST, 259}; 260 261/* 262 * sqe->uring_cmd_flags top 8bits aren't available for userspace 263 * IORING_URING_CMD_FIXED use registered buffer; pass this flag 264 * along with setting sqe->buf_index. 265 */ 266#define IORING_URING_CMD_FIXED (1U << 0) 267#define IORING_URING_CMD_MASK IORING_URING_CMD_FIXED 268 269 270/* 271 * sqe->fsync_flags 272 */ 273#define IORING_FSYNC_DATASYNC (1U << 0) 274 275/* 276 * sqe->timeout_flags 277 */ 278#define IORING_TIMEOUT_ABS (1U << 0) 279#define IORING_TIMEOUT_UPDATE (1U << 1) 280#define IORING_TIMEOUT_BOOTTIME (1U << 2) 281#define IORING_TIMEOUT_REALTIME (1U << 3) 282#define IORING_LINK_TIMEOUT_UPDATE (1U << 4) 283#define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5) 284#define IORING_TIMEOUT_MULTISHOT (1U << 6) 285#define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME) 286#define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE) 287/* 288 * sqe->splice_flags 289 * extends splice(2) flags 290 */ 291#define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 292 293/* 294 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 295 * command flags for POLL_ADD are stored in sqe->len. 296 * 297 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 298 * the poll handler will continue to report 299 * CQEs on behalf of the same SQE. 300 * 301 * IORING_POLL_UPDATE Update existing poll request, matching 302 * sqe->addr as the old user_data field. 303 * 304 * IORING_POLL_LEVEL Level triggered poll. 305 */ 306#define IORING_POLL_ADD_MULTI (1U << 0) 307#define IORING_POLL_UPDATE_EVENTS (1U << 1) 308#define IORING_POLL_UPDATE_USER_DATA (1U << 2) 309#define IORING_POLL_ADD_LEVEL (1U << 3) 310 311/* 312 * ASYNC_CANCEL flags. 313 * 314 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key 315 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the 316 * request 'user_data' 317 * IORING_ASYNC_CANCEL_ANY Match any request 318 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor 319 * IORING_ASYNC_CANCEL_USERDATA Match on user_data, default for no other key 320 * IORING_ASYNC_CANCEL_OP Match request based on opcode 321 */ 322#define IORING_ASYNC_CANCEL_ALL (1U << 0) 323#define IORING_ASYNC_CANCEL_FD (1U << 1) 324#define IORING_ASYNC_CANCEL_ANY (1U << 2) 325#define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3) 326#define IORING_ASYNC_CANCEL_USERDATA (1U << 4) 327#define IORING_ASYNC_CANCEL_OP (1U << 5) 328 329/* 330 * send/sendmsg and recv/recvmsg flags (sqe->ioprio) 331 * 332 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send 333 * or receive and arm poll if that yields an 334 * -EAGAIN result, arm poll upfront and skip 335 * the initial transfer attempt. 336 * 337 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if 338 * the handler will continue to report 339 * CQEs on behalf of the same SQE. 340 * 341 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in 342 * the buf_index field. 343 * 344 * IORING_SEND_ZC_REPORT_USAGE 345 * If set, SEND[MSG]_ZC should report 346 * the zerocopy usage in cqe.res 347 * for the IORING_CQE_F_NOTIF cqe. 348 * 0 is reported if zerocopy was actually possible. 349 * IORING_NOTIF_USAGE_ZC_COPIED if data was copied 350 * (at least partially). 351 */ 352#define IORING_RECVSEND_POLL_FIRST (1U << 0) 353#define IORING_RECV_MULTISHOT (1U << 1) 354#define IORING_RECVSEND_FIXED_BUF (1U << 2) 355#define IORING_SEND_ZC_REPORT_USAGE (1U << 3) 356 357/* 358 * cqe.res for IORING_CQE_F_NOTIF if 359 * IORING_SEND_ZC_REPORT_USAGE was requested 360 * 361 * It should be treated as a flag, all other 362 * bits of cqe.res should be treated as reserved! 363 */ 364#define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31) 365 366/* 367 * accept flags stored in sqe->ioprio 368 */ 369#define IORING_ACCEPT_MULTISHOT (1U << 0) 370 371/* 372 * IORING_OP_MSG_RING command types, stored in sqe->addr 373 */ 374enum { 375 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */ 376 IORING_MSG_SEND_FD, /* send a registered fd to another ring */ 377}; 378 379/* 380 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags) 381 * 382 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not 383 * applicable for IORING_MSG_DATA, obviously. 384 */ 385#define IORING_MSG_RING_CQE_SKIP (1U << 0) 386/* Pass through the flags from sqe->file_index to cqe->flags */ 387#define IORING_MSG_RING_FLAGS_PASS (1U << 1) 388 389/* 390 * IO completion data structure (Completion Queue Entry) 391 */ 392struct io_uring_cqe { 393 __u64 user_data; /* sqe->data submission passed back */ 394 __s32 res; /* result code for this event */ 395 __u32 flags; 396 397 /* 398 * If the ring is initialized with IORING_SETUP_CQE32, then this field 399 * contains 16-bytes of padding, doubling the size of the CQE. 400 */ 401 __u64 big_cqe[]; 402}; 403 404/* 405 * cqe->flags 406 * 407 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 408 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 409 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv 410 * IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct 411 * them from sends. 412 */ 413#define IORING_CQE_F_BUFFER (1U << 0) 414#define IORING_CQE_F_MORE (1U << 1) 415#define IORING_CQE_F_SOCK_NONEMPTY (1U << 2) 416#define IORING_CQE_F_NOTIF (1U << 3) 417 418enum { 419 IORING_CQE_BUFFER_SHIFT = 16, 420}; 421 422/* 423 * Magic offsets for the application to mmap the data it needs 424 */ 425#define IORING_OFF_SQ_RING 0ULL 426#define IORING_OFF_CQ_RING 0x8000000ULL 427#define IORING_OFF_SQES 0x10000000ULL 428#define IORING_OFF_PBUF_RING 0x80000000ULL 429#define IORING_OFF_PBUF_SHIFT 16 430#define IORING_OFF_MMAP_MASK 0xf8000000ULL 431 432/* 433 * Filled with the offset for mmap(2) 434 */ 435struct io_sqring_offsets { 436 __u32 head; 437 __u32 tail; 438 __u32 ring_mask; 439 __u32 ring_entries; 440 __u32 flags; 441 __u32 dropped; 442 __u32 array; 443 __u32 resv1; 444 __u64 user_addr; 445}; 446 447/* 448 * sq_ring->flags 449 */ 450#define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 451#define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 452#define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ 453 454struct io_cqring_offsets { 455 __u32 head; 456 __u32 tail; 457 __u32 ring_mask; 458 __u32 ring_entries; 459 __u32 overflow; 460 __u32 cqes; 461 __u32 flags; 462 __u32 resv1; 463 __u64 user_addr; 464}; 465 466/* 467 * cq_ring->flags 468 */ 469 470/* disable eventfd notifications */ 471#define IORING_CQ_EVENTFD_DISABLED (1U << 0) 472 473/* 474 * io_uring_enter(2) flags 475 */ 476#define IORING_ENTER_GETEVENTS (1U << 0) 477#define IORING_ENTER_SQ_WAKEUP (1U << 1) 478#define IORING_ENTER_SQ_WAIT (1U << 2) 479#define IORING_ENTER_EXT_ARG (1U << 3) 480#define IORING_ENTER_REGISTERED_RING (1U << 4) 481 482/* 483 * Passed in for io_uring_setup(2). Copied back with updated info on success 484 */ 485struct io_uring_params { 486 __u32 sq_entries; 487 __u32 cq_entries; 488 __u32 flags; 489 __u32 sq_thread_cpu; 490 __u32 sq_thread_idle; 491 __u32 features; 492 __u32 wq_fd; 493 __u32 resv[3]; 494 struct io_sqring_offsets sq_off; 495 struct io_cqring_offsets cq_off; 496}; 497 498/* 499 * io_uring_params->features flags 500 */ 501#define IORING_FEAT_SINGLE_MMAP (1U << 0) 502#define IORING_FEAT_NODROP (1U << 1) 503#define IORING_FEAT_SUBMIT_STABLE (1U << 2) 504#define IORING_FEAT_RW_CUR_POS (1U << 3) 505#define IORING_FEAT_CUR_PERSONALITY (1U << 4) 506#define IORING_FEAT_FAST_POLL (1U << 5) 507#define IORING_FEAT_POLL_32BITS (1U << 6) 508#define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 509#define IORING_FEAT_EXT_ARG (1U << 8) 510#define IORING_FEAT_NATIVE_WORKERS (1U << 9) 511#define IORING_FEAT_RSRC_TAGS (1U << 10) 512#define IORING_FEAT_CQE_SKIP (1U << 11) 513#define IORING_FEAT_LINKED_FILE (1U << 12) 514#define IORING_FEAT_REG_REG_RING (1U << 13) 515 516/* 517 * io_uring_register(2) opcodes and arguments 518 */ 519enum { 520 IORING_REGISTER_BUFFERS = 0, 521 IORING_UNREGISTER_BUFFERS = 1, 522 IORING_REGISTER_FILES = 2, 523 IORING_UNREGISTER_FILES = 3, 524 IORING_REGISTER_EVENTFD = 4, 525 IORING_UNREGISTER_EVENTFD = 5, 526 IORING_REGISTER_FILES_UPDATE = 6, 527 IORING_REGISTER_EVENTFD_ASYNC = 7, 528 IORING_REGISTER_PROBE = 8, 529 IORING_REGISTER_PERSONALITY = 9, 530 IORING_UNREGISTER_PERSONALITY = 10, 531 IORING_REGISTER_RESTRICTIONS = 11, 532 IORING_REGISTER_ENABLE_RINGS = 12, 533 534 /* extended with tagging */ 535 IORING_REGISTER_FILES2 = 13, 536 IORING_REGISTER_FILES_UPDATE2 = 14, 537 IORING_REGISTER_BUFFERS2 = 15, 538 IORING_REGISTER_BUFFERS_UPDATE = 16, 539 540 /* set/clear io-wq thread affinities */ 541 IORING_REGISTER_IOWQ_AFF = 17, 542 IORING_UNREGISTER_IOWQ_AFF = 18, 543 544 /* set/get max number of io-wq workers */ 545 IORING_REGISTER_IOWQ_MAX_WORKERS = 19, 546 547 /* register/unregister io_uring fd with the ring */ 548 IORING_REGISTER_RING_FDS = 20, 549 IORING_UNREGISTER_RING_FDS = 21, 550 551 /* register ring based provide buffer group */ 552 IORING_REGISTER_PBUF_RING = 22, 553 IORING_UNREGISTER_PBUF_RING = 23, 554 555 /* sync cancelation API */ 556 IORING_REGISTER_SYNC_CANCEL = 24, 557 558 /* register a range of fixed file slots for automatic slot allocation */ 559 IORING_REGISTER_FILE_ALLOC_RANGE = 25, 560 561 /* this goes last */ 562 IORING_REGISTER_LAST, 563 564 /* flag added to the opcode to use a registered ring fd */ 565 IORING_REGISTER_USE_REGISTERED_RING = 1U << 31 566}; 567 568/* io-wq worker categories */ 569enum { 570 IO_WQ_BOUND, 571 IO_WQ_UNBOUND, 572}; 573 574/* deprecated, see struct io_uring_rsrc_update */ 575struct io_uring_files_update { 576 __u32 offset; 577 __u32 resv; 578 __aligned_u64 /* __s32 * */ fds; 579}; 580 581/* 582 * Register a fully sparse file space, rather than pass in an array of all 583 * -1 file descriptors. 584 */ 585#define IORING_RSRC_REGISTER_SPARSE (1U << 0) 586 587struct io_uring_rsrc_register { 588 __u32 nr; 589 __u32 flags; 590 __u64 resv2; 591 __aligned_u64 data; 592 __aligned_u64 tags; 593}; 594 595struct io_uring_rsrc_update { 596 __u32 offset; 597 __u32 resv; 598 __aligned_u64 data; 599}; 600 601struct io_uring_rsrc_update2 { 602 __u32 offset; 603 __u32 resv; 604 __aligned_u64 data; 605 __aligned_u64 tags; 606 __u32 nr; 607 __u32 resv2; 608}; 609 610/* Skip updating fd indexes set to this value in the fd table */ 611#define IORING_REGISTER_FILES_SKIP (-2) 612 613#define IO_URING_OP_SUPPORTED (1U << 0) 614 615struct io_uring_probe_op { 616 __u8 op; 617 __u8 resv; 618 __u16 flags; /* IO_URING_OP_* flags */ 619 __u32 resv2; 620}; 621 622struct io_uring_probe { 623 __u8 last_op; /* last opcode supported */ 624 __u8 ops_len; /* length of ops[] array below */ 625 __u16 resv; 626 __u32 resv2[3]; 627 struct io_uring_probe_op ops[]; 628}; 629 630struct io_uring_restriction { 631 __u16 opcode; 632 union { 633 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 634 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 635 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 636 }; 637 __u8 resv; 638 __u32 resv2[3]; 639}; 640 641struct io_uring_buf { 642 __u64 addr; 643 __u32 len; 644 __u16 bid; 645 __u16 resv; 646}; 647 648struct io_uring_buf_ring { 649 union { 650 /* 651 * To avoid spilling into more pages than we need to, the 652 * ring tail is overlaid with the io_uring_buf->resv field. 653 */ 654 struct { 655 __u64 resv1; 656 __u32 resv2; 657 __u16 resv3; 658 __u16 tail; 659 }; 660 __DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs); 661 }; 662}; 663 664/* 665 * Flags for IORING_REGISTER_PBUF_RING. 666 * 667 * IOU_PBUF_RING_MMAP: If set, kernel will allocate the memory for the ring. 668 * The application must not set a ring_addr in struct 669 * io_uring_buf_reg, instead it must subsequently call 670 * mmap(2) with the offset set as: 671 * IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT) 672 * to get a virtual mapping for the ring. 673 */ 674enum { 675 IOU_PBUF_RING_MMAP = 1, 676}; 677 678/* argument for IORING_(UN)REGISTER_PBUF_RING */ 679struct io_uring_buf_reg { 680 __u64 ring_addr; 681 __u32 ring_entries; 682 __u16 bgid; 683 __u16 flags; 684 __u64 resv[3]; 685}; 686 687/* 688 * io_uring_restriction->opcode values 689 */ 690enum { 691 /* Allow an io_uring_register(2) opcode */ 692 IORING_RESTRICTION_REGISTER_OP = 0, 693 694 /* Allow an sqe opcode */ 695 IORING_RESTRICTION_SQE_OP = 1, 696 697 /* Allow sqe flags */ 698 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 699 700 /* Require sqe flags (these flags must be set on each submission) */ 701 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 702 703 IORING_RESTRICTION_LAST 704}; 705 706struct io_uring_getevents_arg { 707 __u64 sigmask; 708 __u32 sigmask_sz; 709 __u32 pad; 710 __u64 ts; 711}; 712 713/* 714 * Argument for IORING_REGISTER_SYNC_CANCEL 715 */ 716struct io_uring_sync_cancel_reg { 717 __u64 addr; 718 __s32 fd; 719 __u32 flags; 720 struct __kernel_timespec timeout; 721 __u8 opcode; 722 __u8 pad[7]; 723 __u64 pad2[3]; 724}; 725 726/* 727 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE 728 * The range is specified as [off, off + len) 729 */ 730struct io_uring_file_index_range { 731 __u32 off; 732 __u32 len; 733 __u64 resv; 734}; 735 736struct io_uring_recvmsg_out { 737 __u32 namelen; 738 __u32 controllen; 739 __u32 payloadlen; 740 __u32 flags; 741}; 742 743/* 744 * Argument for IORING_OP_URING_CMD when file is a socket 745 */ 746enum { 747 SOCKET_URING_OP_SIOCINQ = 0, 748 SOCKET_URING_OP_SIOCOUTQ, 749 SOCKET_URING_OP_GETSOCKOPT, 750 SOCKET_URING_OP_SETSOCKOPT, 751}; 752 753#ifdef __cplusplus 754} 755#endif 756 757#endif 758