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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4aaa9bc4d5
Same problem as with zcrx in the previous patch, the user needs to know SQ/CQ header sizes to allocated memory before setup to use it for user provided rings, i.e. IORING_SETUP_NO_MMAP, however that information is only returned after registration, hence the user is guessing kernel implementation details. Return the header size and alignment, which is split with the same motivation, to allow the user to know the real structure size without alignment in case there will be more flexible placement schemes in the future. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
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/*
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* Header file for the io_uring query interface.
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*/
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#ifndef LINUX_IO_URING_QUERY_H
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#define LINUX_IO_URING_QUERY_H
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#include <linux/types.h>
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struct io_uring_query_hdr {
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__u64 next_entry;
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__u64 query_data;
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__u32 query_op;
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__u32 size;
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__s32 result;
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__u32 __resv[3];
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};
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enum {
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IO_URING_QUERY_OPCODES = 0,
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IO_URING_QUERY_ZCRX = 1,
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IO_URING_QUERY_SCQ = 2,
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__IO_URING_QUERY_MAX,
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};
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/* Doesn't require a ring */
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struct io_uring_query_opcode {
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/* The number of supported IORING_OP_* opcodes */
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__u32 nr_request_opcodes;
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/* The number of supported IORING_[UN]REGISTER_* opcodes */
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__u32 nr_register_opcodes;
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/* Bitmask of all supported IORING_FEAT_* flags */
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__u64 feature_flags;
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/* Bitmask of all supported IORING_SETUP_* flags */
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__u64 ring_setup_flags;
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/* Bitmask of all supported IORING_ENTER_** flags */
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__u64 enter_flags;
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/* Bitmask of all supported IOSQE_* flags */
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__u64 sqe_flags;
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/* The number of available query opcodes */
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__u32 nr_query_opcodes;
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__u32 __pad;
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};
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struct io_uring_query_zcrx {
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/* Bitmask of supported ZCRX_REG_* flags, */
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__u64 register_flags;
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/* Bitmask of all supported IORING_ZCRX_AREA_* flags */
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__u64 area_flags;
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/* The number of supported ZCRX_CTRL_* opcodes */
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__u32 nr_ctrl_opcodes;
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__u32 __resv1;
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/* The refill ring header size */
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__u32 rq_hdr_size;
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/* The alignment for the header */
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__u32 rq_hdr_alignment;
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__u64 __resv2;
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};
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struct io_uring_query_scq {
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/* The SQ/CQ rings header size */
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__u64 hdr_size;
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/* The alignment for the header */
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__u64 hdr_alignment;
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};
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#endif
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