162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef USER_BLK_DRV_CMD_INC_H
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#define USER_BLK_DRV_CMD_INC_H
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#include <linux/types.h>
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/* ublk server command definition */
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/*
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* Admin commands, issued by ublk server, and handled by ublk driver.
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*/
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#define UBLK_CMD_GET_QUEUE_AFFINITY 0x01
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#define UBLK_CMD_GET_DEV_INFO 0x02
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#define UBLK_CMD_ADD_DEV 0x04
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#define UBLK_CMD_DEL_DEV 0x05
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#define UBLK_CMD_START_DEV 0x06
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#define UBLK_CMD_STOP_DEV 0x07
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/*
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* IO commands, issued by ublk server, and handled by ublk driver.
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*
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* FETCH_REQ: issued via sqe(URING_CMD) beforehand for fetching IO request
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* from ublk driver, should be issued only when starting device. After
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* the associated cqe is returned, request's tag can be retrieved via
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* cqe->userdata.
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*
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* COMMIT_AND_FETCH_REQ: issued via sqe(URING_CMD) after ublkserver handled
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* this IO request, request's handling result is committed to ublk
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* driver, meantime FETCH_REQ is piggyback, and FETCH_REQ has to be
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* handled before completing io request.
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*/
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#define UBLK_IO_FETCH_REQ 0x20
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#define UBLK_IO_COMMIT_AND_FETCH_REQ 0x21
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/* only ABORT means that no re-fetch */
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#define UBLK_IO_RES_OK 0
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#define UBLK_IO_RES_ABORT (-ENODEV)
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#define UBLKSRV_CMD_BUF_OFFSET 0
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#define UBLKSRV_IO_BUF_OFFSET 0x80000000
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/* tag bit is 12bit, so at most 4096 IOs for each queue */
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#define UBLK_MAX_QUEUE_DEPTH 4096
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/*
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* zero copy requires 4k block size, and can remap ublk driver's io
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* request into ublksrv's vm space
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*/
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#define UBLK_F_SUPPORT_ZERO_COPY (1ULL << 0)
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/*
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* Force to complete io cmd via io_uring_cmd_complete_in_task so that
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* performance comparison is done easily with using task_work_add
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*/
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#define UBLK_F_URING_CMD_COMP_IN_TASK (1ULL << 1)
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/* device state */
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#define UBLK_S_DEV_DEAD 0
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#define UBLK_S_DEV_LIVE 1
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/* shipped via sqe->cmd of io_uring command */
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struct ublksrv_ctrl_cmd {
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/* sent to which device, must be valid */
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__u32 dev_id;
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/* sent to which queue, must be -1 if the cmd isn't for queue */
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__u16 queue_id;
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/*
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* cmd specific buffer, can be IN or OUT.
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*/
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__u16 len;
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__u64 addr;
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/* inline data */
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__u64 data[2];
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};
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struct ublksrv_ctrl_dev_info {
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__u16 nr_hw_queues;
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__u16 queue_depth;
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__u16 block_size;
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__u16 state;
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__u32 rq_max_blocks;
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__u32 dev_id;
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__u64 dev_blocks;
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__s32 ublksrv_pid;
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__s32 reserved0;
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__u64 flags;
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__u64 flags_reserved;
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/* For ublksrv internal use, invisible to ublk driver */
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__u64 ublksrv_flags;
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__u64 reserved1[9];
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};
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#define UBLK_IO_OP_READ 0
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#define UBLK_IO_OP_WRITE 1
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#define UBLK_IO_OP_FLUSH 2
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#define UBLK_IO_OP_DISCARD 3
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#define UBLK_IO_OP_WRITE_SAME 4
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#define UBLK_IO_OP_WRITE_ZEROES 5
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#define UBLK_IO_F_FAILFAST_DEV (1U << 8)
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#define UBLK_IO_F_FAILFAST_TRANSPORT (1U << 9)
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#define UBLK_IO_F_FAILFAST_DRIVER (1U << 10)
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#define UBLK_IO_F_META (1U << 11)
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#define UBLK_IO_F_FUA (1U << 13)
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#define UBLK_IO_F_NOUNMAP (1U << 15)
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#define UBLK_IO_F_SWAP (1U << 16)
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/*
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* io cmd is described by this structure, and stored in share memory, indexed
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* by request tag.
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*
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* The data is stored by ublk driver, and read by ublksrv after one fetch command
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* returns.
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*/
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struct ublksrv_io_desc {
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/* op: bit 0-7, flags: bit 8-31 */
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__u32 op_flags;
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__u32 nr_sectors;
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/* start sector for this io */
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__u64 start_sector;
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/* buffer address in ublksrv daemon vm space, from ublk driver */
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__u64 addr;
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};
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static inline __u8 ublksrv_get_op(const struct ublksrv_io_desc *iod)
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{
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return iod->op_flags & 0xff;
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}
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static inline __u32 ublksrv_get_flags(const struct ublksrv_io_desc *iod)
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{
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return iod->op_flags >> 8;
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}
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/* issued to ublk driver via /dev/ublkcN */
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struct ublksrv_io_cmd {
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__u16 q_id;
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/* for fetch/commit which result */
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__u16 tag;
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/* io result, it is valid for COMMIT* command only */
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__s32 result;
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/*
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* userspace buffer address in ublksrv daemon process, valid for
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* FETCH* command only
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*/
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__u64 addr;
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};
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#endif
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