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 24 extern "C" { 25 #endif 26 27 /* 28 * IO submission data structure (Submission Queue Entry) 29 */ 30 struct 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 __u32 install_fd_flags; 75 __u32 nop_flags; 76 }; 77 __u64 user_data; /* data to be passed back at completion time */ 78 /* pack this to avoid bogus arm OABI complaints */ 79 union { 80 /* index into fixed buffers, if used */ 81 __u16 buf_index; 82 /* for grouped buffer selection */ 83 __u16 buf_group; 84 } __attribute__((packed)); 85 /* personality to use, if used */ 86 __u16 personality; 87 union { 88 __s32 splice_fd_in; 89 __u32 file_index; 90 __u32 zcrx_ifq_idx; 91 __u32 optlen; 92 struct { 93 __u16 addr_len; 94 __u16 __pad3[1]; 95 }; 96 }; 97 union { 98 struct { 99 __u64 addr3; 100 __u64 __pad2[1]; 101 }; 102 struct { 103 __u64 attr_ptr; /* pointer to attribute information */ 104 __u64 attr_type_mask; /* bit mask of attributes */ 105 }; 106 __u64 optval; 107 /* 108 * If the ring is initialized with IORING_SETUP_SQE128, then 109 * this field is used for 80 bytes of arbitrary command data 110 */ 111 __u8 cmd[0]; 112 }; 113 }; 114 115 /* sqe->attr_type_mask flags */ 116 #define IORING_RW_ATTR_FLAG_PI (1U << 0) 117 /* PI attribute information */ 118 struct io_uring_attr_pi { 119 __u16 flags; 120 __u16 app_tag; 121 __u32 len; 122 __u64 addr; 123 __u64 seed; 124 __u64 rsvd; 125 }; 126 127 /* 128 * If sqe->file_index is set to this for opcodes that instantiate a new 129 * direct descriptor (like openat/openat2/accept), then io_uring will allocate 130 * an available direct descriptor instead of having the application pass one 131 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE 132 * if the space is full. 133 */ 134 #define IORING_FILE_INDEX_ALLOC (~0U) 135 136 enum io_uring_sqe_flags_bit { 137 IOSQE_FIXED_FILE_BIT, 138 IOSQE_IO_DRAIN_BIT, 139 IOSQE_IO_LINK_BIT, 140 IOSQE_IO_HARDLINK_BIT, 141 IOSQE_ASYNC_BIT, 142 IOSQE_BUFFER_SELECT_BIT, 143 IOSQE_CQE_SKIP_SUCCESS_BIT, 144 }; 145 146 /* 147 * sqe->flags 148 */ 149 /* use fixed fileset */ 150 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 151 /* issue after inflight IO */ 152 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 153 /* links next sqe */ 154 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 155 /* like LINK, but stronger */ 156 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 157 /* always go async */ 158 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 159 /* select buffer from sqe->buf_group */ 160 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 161 /* don't post CQE if request succeeded */ 162 #define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT) 163 164 /* 165 * io_uring_setup() flags 166 */ 167 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 168 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 169 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 170 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 171 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 172 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 173 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 174 #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */ 175 /* 176 * Cooperative task running. When requests complete, they often require 177 * forcing the submitter to transition to the kernel to complete. If this 178 * flag is set, work will be done when the task transitions anyway, rather 179 * than force an inter-processor interrupt reschedule. This avoids interrupting 180 * a task running in userspace, and saves an IPI. 181 */ 182 #define IORING_SETUP_COOP_TASKRUN (1U << 8) 183 /* 184 * If COOP_TASKRUN is set, get notified if task work is available for 185 * running and a kernel transition would be needed to run it. This sets 186 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. 187 */ 188 #define IORING_SETUP_TASKRUN_FLAG (1U << 9) 189 #define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ 190 #define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */ 191 /* 192 * Only one task is allowed to submit requests 193 */ 194 #define IORING_SETUP_SINGLE_ISSUER (1U << 12) 195 196 /* 197 * Defer running task work to get events. 198 * Rather than running bits of task work whenever the task transitions 199 * try to do it just before it is needed. 200 */ 201 #define IORING_SETUP_DEFER_TASKRUN (1U << 13) 202 203 /* 204 * Application provides the memory for the rings 205 */ 206 #define IORING_SETUP_NO_MMAP (1U << 14) 207 208 /* 209 * Register the ring fd in itself for use with 210 * IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather 211 * than an fd. 212 */ 213 #define IORING_SETUP_REGISTERED_FD_ONLY (1U << 15) 214 215 /* 216 * Removes indirection through the SQ index array. 217 */ 218 #define IORING_SETUP_NO_SQARRAY (1U << 16) 219 220 /* Use hybrid poll in iopoll process */ 221 #define IORING_SETUP_HYBRID_IOPOLL (1U << 17) 222 223 enum io_uring_op { 224 IORING_OP_NOP, 225 IORING_OP_READV, 226 IORING_OP_WRITEV, 227 IORING_OP_FSYNC, 228 IORING_OP_READ_FIXED, 229 IORING_OP_WRITE_FIXED, 230 IORING_OP_POLL_ADD, 231 IORING_OP_POLL_REMOVE, 232 IORING_OP_SYNC_FILE_RANGE, 233 IORING_OP_SENDMSG, 234 IORING_OP_RECVMSG, 235 IORING_OP_TIMEOUT, 236 IORING_OP_TIMEOUT_REMOVE, 237 IORING_OP_ACCEPT, 238 IORING_OP_ASYNC_CANCEL, 239 IORING_OP_LINK_TIMEOUT, 240 IORING_OP_CONNECT, 241 IORING_OP_FALLOCATE, 242 IORING_OP_OPENAT, 243 IORING_OP_CLOSE, 244 IORING_OP_FILES_UPDATE, 245 IORING_OP_STATX, 246 IORING_OP_READ, 247 IORING_OP_WRITE, 248 IORING_OP_FADVISE, 249 IORING_OP_MADVISE, 250 IORING_OP_SEND, 251 IORING_OP_RECV, 252 IORING_OP_OPENAT2, 253 IORING_OP_EPOLL_CTL, 254 IORING_OP_SPLICE, 255 IORING_OP_PROVIDE_BUFFERS, 256 IORING_OP_REMOVE_BUFFERS, 257 IORING_OP_TEE, 258 IORING_OP_SHUTDOWN, 259 IORING_OP_RENAMEAT, 260 IORING_OP_UNLINKAT, 261 IORING_OP_MKDIRAT, 262 IORING_OP_SYMLINKAT, 263 IORING_OP_LINKAT, 264 IORING_OP_MSG_RING, 265 IORING_OP_FSETXATTR, 266 IORING_OP_SETXATTR, 267 IORING_OP_FGETXATTR, 268 IORING_OP_GETXATTR, 269 IORING_OP_SOCKET, 270 IORING_OP_URING_CMD, 271 IORING_OP_SEND_ZC, 272 IORING_OP_SENDMSG_ZC, 273 IORING_OP_READ_MULTISHOT, 274 IORING_OP_WAITID, 275 IORING_OP_FUTEX_WAIT, 276 IORING_OP_FUTEX_WAKE, 277 IORING_OP_FUTEX_WAITV, 278 IORING_OP_FIXED_FD_INSTALL, 279 IORING_OP_FTRUNCATE, 280 IORING_OP_BIND, 281 IORING_OP_LISTEN, 282 IORING_OP_RECV_ZC, 283 IORING_OP_EPOLL_WAIT, 284 IORING_OP_READV_FIXED, 285 IORING_OP_WRITEV_FIXED, 286 287 /* this goes last, obviously */ 288 IORING_OP_LAST, 289 }; 290 291 /* 292 * sqe->uring_cmd_flags top 8bits aren't available for userspace 293 * IORING_URING_CMD_FIXED use registered buffer; pass this flag 294 * along with setting sqe->buf_index. 295 */ 296 #define IORING_URING_CMD_FIXED (1U << 0) 297 #define IORING_URING_CMD_MASK IORING_URING_CMD_FIXED 298 299 300 /* 301 * sqe->fsync_flags 302 */ 303 #define IORING_FSYNC_DATASYNC (1U << 0) 304 305 /* 306 * sqe->timeout_flags 307 */ 308 #define IORING_TIMEOUT_ABS (1U << 0) 309 #define IORING_TIMEOUT_UPDATE (1U << 1) 310 #define IORING_TIMEOUT_BOOTTIME (1U << 2) 311 #define IORING_TIMEOUT_REALTIME (1U << 3) 312 #define IORING_LINK_TIMEOUT_UPDATE (1U << 4) 313 #define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5) 314 #define IORING_TIMEOUT_MULTISHOT (1U << 6) 315 #define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME) 316 #define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE) 317 /* 318 * sqe->splice_flags 319 * extends splice(2) flags 320 */ 321 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 322 323 /* 324 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 325 * command flags for POLL_ADD are stored in sqe->len. 326 * 327 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 328 * the poll handler will continue to report 329 * CQEs on behalf of the same SQE. 330 * 331 * IORING_POLL_UPDATE Update existing poll request, matching 332 * sqe->addr as the old user_data field. 333 * 334 * IORING_POLL_LEVEL Level triggered poll. 335 */ 336 #define IORING_POLL_ADD_MULTI (1U << 0) 337 #define IORING_POLL_UPDATE_EVENTS (1U << 1) 338 #define IORING_POLL_UPDATE_USER_DATA (1U << 2) 339 #define IORING_POLL_ADD_LEVEL (1U << 3) 340 341 /* 342 * ASYNC_CANCEL flags. 343 * 344 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key 345 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the 346 * request 'user_data' 347 * IORING_ASYNC_CANCEL_ANY Match any request 348 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor 349 * IORING_ASYNC_CANCEL_USERDATA Match on user_data, default for no other key 350 * IORING_ASYNC_CANCEL_OP Match request based on opcode 351 */ 352 #define IORING_ASYNC_CANCEL_ALL (1U << 0) 353 #define IORING_ASYNC_CANCEL_FD (1U << 1) 354 #define IORING_ASYNC_CANCEL_ANY (1U << 2) 355 #define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3) 356 #define IORING_ASYNC_CANCEL_USERDATA (1U << 4) 357 #define IORING_ASYNC_CANCEL_OP (1U << 5) 358 359 /* 360 * send/sendmsg and recv/recvmsg flags (sqe->ioprio) 361 * 362 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send 363 * or receive and arm poll if that yields an 364 * -EAGAIN result, arm poll upfront and skip 365 * the initial transfer attempt. 366 * 367 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if 368 * the handler will continue to report 369 * CQEs on behalf of the same SQE. 370 * 371 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in 372 * the buf_index field. 373 * 374 * IORING_SEND_ZC_REPORT_USAGE 375 * If set, SEND[MSG]_ZC should report 376 * the zerocopy usage in cqe.res 377 * for the IORING_CQE_F_NOTIF cqe. 378 * 0 is reported if zerocopy was actually possible. 379 * IORING_NOTIF_USAGE_ZC_COPIED if data was copied 380 * (at least partially). 381 * 382 * IORING_RECVSEND_BUNDLE Used with IOSQE_BUFFER_SELECT. If set, send or 383 * recv will grab as many buffers from the buffer 384 * group ID given and send them all. The completion 385 * result will be the number of buffers send, with 386 * the starting buffer ID in cqe->flags as per 387 * usual for provided buffer usage. The buffers 388 * will be contiguous from the starting buffer ID. 389 */ 390 #define IORING_RECVSEND_POLL_FIRST (1U << 0) 391 #define IORING_RECV_MULTISHOT (1U << 1) 392 #define IORING_RECVSEND_FIXED_BUF (1U << 2) 393 #define IORING_SEND_ZC_REPORT_USAGE (1U << 3) 394 #define IORING_RECVSEND_BUNDLE (1U << 4) 395 396 /* 397 * cqe.res for IORING_CQE_F_NOTIF if 398 * IORING_SEND_ZC_REPORT_USAGE was requested 399 * 400 * It should be treated as a flag, all other 401 * bits of cqe.res should be treated as reserved! 402 */ 403 #define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31) 404 405 /* 406 * accept flags stored in sqe->ioprio 407 */ 408 #define IORING_ACCEPT_MULTISHOT (1U << 0) 409 #define IORING_ACCEPT_DONTWAIT (1U << 1) 410 #define IORING_ACCEPT_POLL_FIRST (1U << 2) 411 412 /* 413 * IORING_OP_MSG_RING command types, stored in sqe->addr 414 */ 415 enum io_uring_msg_ring_flags { 416 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */ 417 IORING_MSG_SEND_FD, /* send a registered fd to another ring */ 418 }; 419 420 /* 421 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags) 422 * 423 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not 424 * applicable for IORING_MSG_DATA, obviously. 425 */ 426 #define IORING_MSG_RING_CQE_SKIP (1U << 0) 427 /* Pass through the flags from sqe->file_index to cqe->flags */ 428 #define IORING_MSG_RING_FLAGS_PASS (1U << 1) 429 430 /* 431 * IORING_OP_FIXED_FD_INSTALL flags (sqe->install_fd_flags) 432 * 433 * IORING_FIXED_FD_NO_CLOEXEC Don't mark the fd as O_CLOEXEC 434 */ 435 #define IORING_FIXED_FD_NO_CLOEXEC (1U << 0) 436 437 /* 438 * IORING_OP_NOP flags (sqe->nop_flags) 439 * 440 * IORING_NOP_INJECT_RESULT Inject result from sqe->result 441 */ 442 #define IORING_NOP_INJECT_RESULT (1U << 0) 443 #define IORING_NOP_FILE (1U << 1) 444 #define IORING_NOP_FIXED_FILE (1U << 2) 445 #define IORING_NOP_FIXED_BUFFER (1U << 3) 446 447 /* 448 * IO completion data structure (Completion Queue Entry) 449 */ 450 struct io_uring_cqe { 451 __u64 user_data; /* sqe->user_data value passed back */ 452 __s32 res; /* result code for this event */ 453 __u32 flags; 454 455 /* 456 * If the ring is initialized with IORING_SETUP_CQE32, then this field 457 * contains 16-bytes of padding, doubling the size of the CQE. 458 */ 459 __u64 big_cqe[]; 460 }; 461 462 /* 463 * cqe->flags 464 * 465 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 466 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 467 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv 468 * IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct 469 * them from sends. 470 * IORING_CQE_F_BUF_MORE If set, the buffer ID set in the completion will get 471 * more completions. In other words, the buffer is being 472 * partially consumed, and will be used by the kernel for 473 * more completions. This is only set for buffers used via 474 * the incremental buffer consumption, as provided by 475 * a ring buffer setup with IOU_PBUF_RING_INC. For any 476 * other provided buffer type, all completions with a 477 * buffer passed back is automatically returned to the 478 * application. 479 */ 480 #define IORING_CQE_F_BUFFER (1U << 0) 481 #define IORING_CQE_F_MORE (1U << 1) 482 #define IORING_CQE_F_SOCK_NONEMPTY (1U << 2) 483 #define IORING_CQE_F_NOTIF (1U << 3) 484 #define IORING_CQE_F_BUF_MORE (1U << 4) 485 486 #define IORING_CQE_BUFFER_SHIFT 16 487 488 /* 489 * Magic offsets for the application to mmap the data it needs 490 */ 491 #define IORING_OFF_SQ_RING 0ULL 492 #define IORING_OFF_CQ_RING 0x8000000ULL 493 #define IORING_OFF_SQES 0x10000000ULL 494 #define IORING_OFF_PBUF_RING 0x80000000ULL 495 #define IORING_OFF_PBUF_SHIFT 16 496 #define IORING_OFF_MMAP_MASK 0xf8000000ULL 497 498 /* 499 * Filled with the offset for mmap(2) 500 */ 501 struct io_sqring_offsets { 502 __u32 head; 503 __u32 tail; 504 __u32 ring_mask; 505 __u32 ring_entries; 506 __u32 flags; 507 __u32 dropped; 508 __u32 array; 509 __u32 resv1; 510 __u64 user_addr; 511 }; 512 513 /* 514 * sq_ring->flags 515 */ 516 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 517 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 518 #define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ 519 520 struct io_cqring_offsets { 521 __u32 head; 522 __u32 tail; 523 __u32 ring_mask; 524 __u32 ring_entries; 525 __u32 overflow; 526 __u32 cqes; 527 __u32 flags; 528 __u32 resv1; 529 __u64 user_addr; 530 }; 531 532 /* 533 * cq_ring->flags 534 */ 535 536 /* disable eventfd notifications */ 537 #define IORING_CQ_EVENTFD_DISABLED (1U << 0) 538 539 /* 540 * io_uring_enter(2) flags 541 */ 542 #define IORING_ENTER_GETEVENTS (1U << 0) 543 #define IORING_ENTER_SQ_WAKEUP (1U << 1) 544 #define IORING_ENTER_SQ_WAIT (1U << 2) 545 #define IORING_ENTER_EXT_ARG (1U << 3) 546 #define IORING_ENTER_REGISTERED_RING (1U << 4) 547 #define IORING_ENTER_ABS_TIMER (1U << 5) 548 #define IORING_ENTER_EXT_ARG_REG (1U << 6) 549 550 /* 551 * Passed in for io_uring_setup(2). Copied back with updated info on success 552 */ 553 struct io_uring_params { 554 __u32 sq_entries; 555 __u32 cq_entries; 556 __u32 flags; 557 __u32 sq_thread_cpu; 558 __u32 sq_thread_idle; 559 __u32 features; 560 __u32 wq_fd; 561 __u32 resv[3]; 562 struct io_sqring_offsets sq_off; 563 struct io_cqring_offsets cq_off; 564 }; 565 566 /* 567 * io_uring_params->features flags 568 */ 569 #define IORING_FEAT_SINGLE_MMAP (1U << 0) 570 #define IORING_FEAT_NODROP (1U << 1) 571 #define IORING_FEAT_SUBMIT_STABLE (1U << 2) 572 #define IORING_FEAT_RW_CUR_POS (1U << 3) 573 #define IORING_FEAT_CUR_PERSONALITY (1U << 4) 574 #define IORING_FEAT_FAST_POLL (1U << 5) 575 #define IORING_FEAT_POLL_32BITS (1U << 6) 576 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 577 #define IORING_FEAT_EXT_ARG (1U << 8) 578 #define IORING_FEAT_NATIVE_WORKERS (1U << 9) 579 #define IORING_FEAT_RSRC_TAGS (1U << 10) 580 #define IORING_FEAT_CQE_SKIP (1U << 11) 581 #define IORING_FEAT_LINKED_FILE (1U << 12) 582 #define IORING_FEAT_REG_REG_RING (1U << 13) 583 #define IORING_FEAT_RECVSEND_BUNDLE (1U << 14) 584 #define IORING_FEAT_MIN_TIMEOUT (1U << 15) 585 #define IORING_FEAT_RW_ATTR (1U << 16) 586 587 /* 588 * io_uring_register(2) opcodes and arguments 589 */ 590 enum io_uring_register_op { 591 IORING_REGISTER_BUFFERS = 0, 592 IORING_UNREGISTER_BUFFERS = 1, 593 IORING_REGISTER_FILES = 2, 594 IORING_UNREGISTER_FILES = 3, 595 IORING_REGISTER_EVENTFD = 4, 596 IORING_UNREGISTER_EVENTFD = 5, 597 IORING_REGISTER_FILES_UPDATE = 6, 598 IORING_REGISTER_EVENTFD_ASYNC = 7, 599 IORING_REGISTER_PROBE = 8, 600 IORING_REGISTER_PERSONALITY = 9, 601 IORING_UNREGISTER_PERSONALITY = 10, 602 IORING_REGISTER_RESTRICTIONS = 11, 603 IORING_REGISTER_ENABLE_RINGS = 12, 604 605 /* extended with tagging */ 606 IORING_REGISTER_FILES2 = 13, 607 IORING_REGISTER_FILES_UPDATE2 = 14, 608 IORING_REGISTER_BUFFERS2 = 15, 609 IORING_REGISTER_BUFFERS_UPDATE = 16, 610 611 /* set/clear io-wq thread affinities */ 612 IORING_REGISTER_IOWQ_AFF = 17, 613 IORING_UNREGISTER_IOWQ_AFF = 18, 614 615 /* set/get max number of io-wq workers */ 616 IORING_REGISTER_IOWQ_MAX_WORKERS = 19, 617 618 /* register/unregister io_uring fd with the ring */ 619 IORING_REGISTER_RING_FDS = 20, 620 IORING_UNREGISTER_RING_FDS = 21, 621 622 /* register ring based provide buffer group */ 623 IORING_REGISTER_PBUF_RING = 22, 624 IORING_UNREGISTER_PBUF_RING = 23, 625 626 /* sync cancelation API */ 627 IORING_REGISTER_SYNC_CANCEL = 24, 628 629 /* register a range of fixed file slots for automatic slot allocation */ 630 IORING_REGISTER_FILE_ALLOC_RANGE = 25, 631 632 /* return status information for a buffer group */ 633 IORING_REGISTER_PBUF_STATUS = 26, 634 635 /* set/clear busy poll settings */ 636 IORING_REGISTER_NAPI = 27, 637 IORING_UNREGISTER_NAPI = 28, 638 639 IORING_REGISTER_CLOCK = 29, 640 641 /* clone registered buffers from source ring to current ring */ 642 IORING_REGISTER_CLONE_BUFFERS = 30, 643 644 /* send MSG_RING without having a ring */ 645 IORING_REGISTER_SEND_MSG_RING = 31, 646 647 /* register a netdev hw rx queue for zerocopy */ 648 IORING_REGISTER_ZCRX_IFQ = 32, 649 650 /* resize CQ ring */ 651 IORING_REGISTER_RESIZE_RINGS = 33, 652 653 IORING_REGISTER_MEM_REGION = 34, 654 655 /* this goes last */ 656 IORING_REGISTER_LAST, 657 658 /* flag added to the opcode to use a registered ring fd */ 659 IORING_REGISTER_USE_REGISTERED_RING = 1U << 31 660 }; 661 662 /* io-wq worker categories */ 663 enum io_wq_type { 664 IO_WQ_BOUND, 665 IO_WQ_UNBOUND, 666 }; 667 668 /* deprecated, see struct io_uring_rsrc_update */ 669 struct io_uring_files_update { 670 __u32 offset; 671 __u32 resv; 672 __aligned_u64 /* __s32 * */ fds; 673 }; 674 675 enum { 676 /* initialise with user provided memory pointed by user_addr */ 677 IORING_MEM_REGION_TYPE_USER = 1, 678 }; 679 680 struct io_uring_region_desc { 681 __u64 user_addr; 682 __u64 size; 683 __u32 flags; 684 __u32 id; 685 __u64 mmap_offset; 686 __u64 __resv[4]; 687 }; 688 689 enum { 690 /* expose the region as registered wait arguments */ 691 IORING_MEM_REGION_REG_WAIT_ARG = 1, 692 }; 693 694 struct io_uring_mem_region_reg { 695 __u64 region_uptr; /* struct io_uring_region_desc * */ 696 __u64 flags; 697 __u64 __resv[2]; 698 }; 699 700 /* 701 * Register a fully sparse file space, rather than pass in an array of all 702 * -1 file descriptors. 703 */ 704 #define IORING_RSRC_REGISTER_SPARSE (1U << 0) 705 706 struct io_uring_rsrc_register { 707 __u32 nr; 708 __u32 flags; 709 __u64 resv2; 710 __aligned_u64 data; 711 __aligned_u64 tags; 712 }; 713 714 struct io_uring_rsrc_update { 715 __u32 offset; 716 __u32 resv; 717 __aligned_u64 data; 718 }; 719 720 struct io_uring_rsrc_update2 { 721 __u32 offset; 722 __u32 resv; 723 __aligned_u64 data; 724 __aligned_u64 tags; 725 __u32 nr; 726 __u32 resv2; 727 }; 728 729 /* Skip updating fd indexes set to this value in the fd table */ 730 #define IORING_REGISTER_FILES_SKIP (-2) 731 732 #define IO_URING_OP_SUPPORTED (1U << 0) 733 734 struct io_uring_probe_op { 735 __u8 op; 736 __u8 resv; 737 __u16 flags; /* IO_URING_OP_* flags */ 738 __u32 resv2; 739 }; 740 741 struct io_uring_probe { 742 __u8 last_op; /* last opcode supported */ 743 __u8 ops_len; /* length of ops[] array below */ 744 __u16 resv; 745 __u32 resv2[3]; 746 struct io_uring_probe_op ops[]; 747 }; 748 749 struct io_uring_restriction { 750 __u16 opcode; 751 union { 752 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 753 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 754 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 755 }; 756 __u8 resv; 757 __u32 resv2[3]; 758 }; 759 760 struct io_uring_clock_register { 761 __u32 clockid; 762 __u32 __resv[3]; 763 }; 764 765 enum { 766 IORING_REGISTER_SRC_REGISTERED = (1U << 0), 767 IORING_REGISTER_DST_REPLACE = (1U << 1), 768 }; 769 770 struct io_uring_clone_buffers { 771 __u32 src_fd; 772 __u32 flags; 773 __u32 src_off; 774 __u32 dst_off; 775 __u32 nr; 776 __u32 pad[3]; 777 }; 778 779 struct io_uring_buf { 780 __u64 addr; 781 __u32 len; 782 __u16 bid; 783 __u16 resv; 784 }; 785 786 struct io_uring_buf_ring { 787 union { 788 /* 789 * To avoid spilling into more pages than we need to, the 790 * ring tail is overlaid with the io_uring_buf->resv field. 791 */ 792 struct { 793 __u64 resv1; 794 __u32 resv2; 795 __u16 resv3; 796 __u16 tail; 797 }; 798 __DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs); 799 }; 800 }; 801 802 /* 803 * Flags for IORING_REGISTER_PBUF_RING. 804 * 805 * IOU_PBUF_RING_MMAP: If set, kernel will allocate the memory for the ring. 806 * The application must not set a ring_addr in struct 807 * io_uring_buf_reg, instead it must subsequently call 808 * mmap(2) with the offset set as: 809 * IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT) 810 * to get a virtual mapping for the ring. 811 * IOU_PBUF_RING_INC: If set, buffers consumed from this buffer ring can be 812 * consumed incrementally. Normally one (or more) buffers 813 * are fully consumed. With incremental consumptions, it's 814 * feasible to register big ranges of buffers, and each 815 * use of it will consume only as much as it needs. This 816 * requires that both the kernel and application keep 817 * track of where the current read/recv index is at. 818 */ 819 enum io_uring_register_pbuf_ring_flags { 820 IOU_PBUF_RING_MMAP = 1, 821 IOU_PBUF_RING_INC = 2, 822 }; 823 824 /* argument for IORING_(UN)REGISTER_PBUF_RING */ 825 struct io_uring_buf_reg { 826 __u64 ring_addr; 827 __u32 ring_entries; 828 __u16 bgid; 829 __u16 flags; 830 __u64 resv[3]; 831 }; 832 833 /* argument for IORING_REGISTER_PBUF_STATUS */ 834 struct io_uring_buf_status { 835 __u32 buf_group; /* input */ 836 __u32 head; /* output */ 837 __u32 resv[8]; 838 }; 839 840 enum io_uring_napi_op { 841 /* register/ungister backward compatible opcode */ 842 IO_URING_NAPI_REGISTER_OP = 0, 843 844 /* opcodes to update napi_list when static tracking is used */ 845 IO_URING_NAPI_STATIC_ADD_ID = 1, 846 IO_URING_NAPI_STATIC_DEL_ID = 2 847 }; 848 849 enum io_uring_napi_tracking_strategy { 850 /* value must be 0 for backward compatibility */ 851 IO_URING_NAPI_TRACKING_DYNAMIC = 0, 852 IO_URING_NAPI_TRACKING_STATIC = 1, 853 IO_URING_NAPI_TRACKING_INACTIVE = 255 854 }; 855 856 /* argument for IORING_(UN)REGISTER_NAPI */ 857 struct io_uring_napi { 858 __u32 busy_poll_to; 859 __u8 prefer_busy_poll; 860 861 /* a io_uring_napi_op value */ 862 __u8 opcode; 863 __u8 pad[2]; 864 865 /* 866 * for IO_URING_NAPI_REGISTER_OP, it is a 867 * io_uring_napi_tracking_strategy value. 868 * 869 * for IO_URING_NAPI_STATIC_ADD_ID/IO_URING_NAPI_STATIC_DEL_ID 870 * it is the napi id to add/del from napi_list. 871 */ 872 __u32 op_param; 873 __u32 resv; 874 }; 875 876 /* 877 * io_uring_restriction->opcode values 878 */ 879 enum io_uring_register_restriction_op { 880 /* Allow an io_uring_register(2) opcode */ 881 IORING_RESTRICTION_REGISTER_OP = 0, 882 883 /* Allow an sqe opcode */ 884 IORING_RESTRICTION_SQE_OP = 1, 885 886 /* Allow sqe flags */ 887 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 888 889 /* Require sqe flags (these flags must be set on each submission) */ 890 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 891 892 IORING_RESTRICTION_LAST 893 }; 894 895 enum { 896 IORING_REG_WAIT_TS = (1U << 0), 897 }; 898 899 /* 900 * Argument for io_uring_enter(2) with 901 * IORING_GETEVENTS | IORING_ENTER_EXT_ARG_REG set, where the actual argument 902 * is an index into a previously registered fixed wait region described by 903 * the below structure. 904 */ 905 struct io_uring_reg_wait { 906 struct __kernel_timespec ts; 907 __u32 min_wait_usec; 908 __u32 flags; 909 __u64 sigmask; 910 __u32 sigmask_sz; 911 __u32 pad[3]; 912 __u64 pad2[2]; 913 }; 914 915 /* 916 * Argument for io_uring_enter(2) with IORING_GETEVENTS | IORING_ENTER_EXT_ARG 917 */ 918 struct io_uring_getevents_arg { 919 __u64 sigmask; 920 __u32 sigmask_sz; 921 __u32 min_wait_usec; 922 __u64 ts; 923 }; 924 925 /* 926 * Argument for IORING_REGISTER_SYNC_CANCEL 927 */ 928 struct io_uring_sync_cancel_reg { 929 __u64 addr; 930 __s32 fd; 931 __u32 flags; 932 struct __kernel_timespec timeout; 933 __u8 opcode; 934 __u8 pad[7]; 935 __u64 pad2[3]; 936 }; 937 938 /* 939 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE 940 * The range is specified as [off, off + len) 941 */ 942 struct io_uring_file_index_range { 943 __u32 off; 944 __u32 len; 945 __u64 resv; 946 }; 947 948 struct io_uring_recvmsg_out { 949 __u32 namelen; 950 __u32 controllen; 951 __u32 payloadlen; 952 __u32 flags; 953 }; 954 955 /* 956 * Argument for IORING_OP_URING_CMD when file is a socket 957 */ 958 enum io_uring_socket_op { 959 SOCKET_URING_OP_SIOCINQ = 0, 960 SOCKET_URING_OP_SIOCOUTQ, 961 SOCKET_URING_OP_GETSOCKOPT, 962 SOCKET_URING_OP_SETSOCKOPT, 963 }; 964 965 /* Zero copy receive refill queue entry */ 966 struct io_uring_zcrx_rqe { 967 __u64 off; 968 __u32 len; 969 __u32 __pad; 970 }; 971 972 struct io_uring_zcrx_cqe { 973 __u64 off; 974 __u64 __pad; 975 }; 976 977 /* The bit from which area id is encoded into offsets */ 978 #define IORING_ZCRX_AREA_SHIFT 48 979 #define IORING_ZCRX_AREA_MASK (~(((__u64)1 << IORING_ZCRX_AREA_SHIFT) - 1)) 980 981 struct io_uring_zcrx_offsets { 982 __u32 head; 983 __u32 tail; 984 __u32 rqes; 985 __u32 __resv2; 986 __u64 __resv[2]; 987 }; 988 989 struct io_uring_zcrx_area_reg { 990 __u64 addr; 991 __u64 len; 992 __u64 rq_area_token; 993 __u32 flags; 994 __u32 __resv1; 995 __u64 __resv2[2]; 996 }; 997 998 /* 999 * Argument for IORING_REGISTER_ZCRX_IFQ 1000 */ 1001 struct io_uring_zcrx_ifq_reg { 1002 __u32 if_idx; 1003 __u32 if_rxq; 1004 __u32 rq_entries; 1005 __u32 flags; 1006 1007 __u64 area_ptr; /* pointer to struct io_uring_zcrx_area_reg */ 1008 __u64 region_ptr; /* struct io_uring_region_desc * */ 1009 1010 struct io_uring_zcrx_offsets offsets; 1011 __u64 __resv[4]; 1012 }; 1013 1014 #ifdef __cplusplus 1015 } 1016 #endif 1017 1018 #endif 1019