/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */ /* * Header file for the io_uring query interface. * * Copyright (C) 2026 Pavel Begunkov <asml.silence@gmail.com> * Copyright (C) Meta Platforms, Inc. */ #ifndef LINUX_IO_URING_QUERY_H #define LINUX_IO_URING_QUERY_H #include <linux/types.h> struct io_uring_query_hdr { __u64 next_entry; __u64 query_data; __u32 query_op; __u32 size; __s32 result; __u32 __resv[3]; }; enum { IO_URING_QUERY_OPCODES = 0, IO_URING_QUERY_ZCRX = 1, IO_URING_QUERY_SCQ = 2, __IO_URING_QUERY_MAX, }; /* Doesn't require a ring */ struct io_uring_query_opcode { /* The number of supported IORING_OP_* opcodes */ __u32 nr_request_opcodes; /* The number of supported IORING_[UN]REGISTER_* opcodes */ __u32 nr_register_opcodes; /* Bitmask of all supported IORING_FEAT_* flags */ __u64 feature_flags; /* Bitmask of all supported IORING_SETUP_* flags */ __u64 ring_setup_flags; /* Bitmask of all supported IORING_ENTER_** flags */ __u64 enter_flags; /* Bitmask of all supported IOSQE_* flags */ __u64 sqe_flags; /* The number of available query opcodes */ __u32 nr_query_opcodes; __u32 __pad; }; struct io_uring_query_zcrx { /* Bitmask of supported ZCRX_REG_* flags, */ __u64 register_flags; /* Bitmask of all supported IORING_ZCRX_AREA_* flags */ __u64 area_flags; /* The number of supported ZCRX_CTRL_* opcodes */ __u32 nr_ctrl_opcodes; /* Bitmask of ZCRX_FEATURE_* indicating which features are available */ __u32 features; /* The refill ring header size */ __u32 rq_hdr_size; /* The alignment for the header */ __u32 rq_hdr_alignment; __u64 __resv2; }; struct io_uring_query_scq { /* The SQ/CQ rings header size */ __u64 hdr_size; /* The alignment for the header */ __u64 hdr_alignment; }; #endif