/* 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