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166 lines
4.1 KiB
166 lines
4.1 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* RDMA Network Block Driver |
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* |
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. |
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. |
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. |
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*/ |
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#ifndef RNBD_CLT_H |
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#define RNBD_CLT_H |
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#include <linux/wait.h> |
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#include <linux/in.h> |
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#include <linux/inet.h> |
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#include <linux/blk-mq.h> |
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#include <linux/refcount.h> |
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#include <rtrs.h> |
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#include "rnbd-proto.h" |
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#include "rnbd-log.h" |
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/* Max. number of segments per IO request, Mellanox Connect X ~ Connect X5, |
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* choose minimial 30 for all, minus 1 for internal protocol, so 29. |
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*/ |
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#define BMAX_SEGMENTS 29 |
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/* time in seconds between reconnect tries, default to 30 s */ |
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#define RECONNECT_DELAY 30 |
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/* |
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* Number of times to reconnect on error before giving up, 0 for * disabled, |
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* -1 for forever |
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*/ |
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#define MAX_RECONNECTS -1 |
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enum rnbd_clt_dev_state { |
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DEV_STATE_INIT, |
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DEV_STATE_MAPPED, |
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DEV_STATE_MAPPED_DISCONNECTED, |
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DEV_STATE_UNMAPPED, |
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}; |
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struct rnbd_iu_comp { |
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wait_queue_head_t wait; |
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int errno; |
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}; |
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#ifdef CONFIG_ARCH_NO_SG_CHAIN |
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#define RNBD_INLINE_SG_CNT 0 |
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#else |
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#define RNBD_INLINE_SG_CNT 2 |
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#endif |
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#define RNBD_RDMA_SGL_SIZE (sizeof(struct scatterlist) * RNBD_INLINE_SG_CNT) |
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struct rnbd_iu { |
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union { |
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struct request *rq; /* for block io */ |
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void *buf; /* for user messages */ |
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}; |
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struct rtrs_permit *permit; |
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union { |
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/* use to send msg associated with a dev */ |
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struct rnbd_clt_dev *dev; |
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/* use to send msg associated with a sess */ |
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struct rnbd_clt_session *sess; |
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}; |
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struct sg_table sgt; |
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struct work_struct work; |
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int errno; |
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struct rnbd_iu_comp comp; |
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atomic_t refcount; |
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struct scatterlist first_sgl[]; /* must be the last one */ |
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}; |
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struct rnbd_cpu_qlist { |
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struct list_head requeue_list; |
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spinlock_t requeue_lock; |
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unsigned int cpu; |
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}; |
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struct rnbd_clt_session { |
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struct list_head list; |
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struct rtrs_clt *rtrs; |
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wait_queue_head_t rtrs_waitq; |
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bool rtrs_ready; |
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struct rnbd_cpu_qlist __percpu |
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*cpu_queues; |
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DECLARE_BITMAP(cpu_queues_bm, NR_CPUS); |
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int __percpu *cpu_rr; /* per-cpu var for CPU round-robin */ |
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atomic_t busy; |
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size_t queue_depth; |
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u32 max_io_size; |
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struct blk_mq_tag_set tag_set; |
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struct mutex lock; /* protects state and devs_list */ |
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struct list_head devs_list; /* list of struct rnbd_clt_dev */ |
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refcount_t refcount; |
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char sessname[NAME_MAX]; |
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u8 ver; /* protocol version */ |
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}; |
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/** |
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* Submission queues. |
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*/ |
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struct rnbd_queue { |
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struct list_head requeue_list; |
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unsigned long in_list; |
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struct rnbd_clt_dev *dev; |
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struct blk_mq_hw_ctx *hctx; |
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}; |
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struct rnbd_clt_dev { |
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struct rnbd_clt_session *sess; |
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struct request_queue *queue; |
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struct rnbd_queue *hw_queues; |
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u32 device_id; |
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/* local Idr index - used to track minor number allocations. */ |
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u32 clt_device_id; |
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struct mutex lock; |
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enum rnbd_clt_dev_state dev_state; |
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char *pathname; |
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enum rnbd_access_mode access_mode; |
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bool read_only; |
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bool rotational; |
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bool wc; |
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bool fua; |
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u32 max_hw_sectors; |
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u32 max_write_same_sectors; |
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u32 max_discard_sectors; |
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u32 discard_granularity; |
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u32 discard_alignment; |
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u16 secure_discard; |
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u16 physical_block_size; |
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u16 logical_block_size; |
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u16 max_segments; |
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size_t nsectors; |
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u64 size; /* device size in bytes */ |
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struct list_head list; |
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struct gendisk *gd; |
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struct kobject kobj; |
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char *blk_symlink_name; |
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refcount_t refcount; |
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struct work_struct unmap_on_rmmod_work; |
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}; |
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/* rnbd-clt.c */ |
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struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname, |
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struct rtrs_addr *paths, |
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size_t path_cnt, u16 port_nr, |
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const char *pathname, |
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enum rnbd_access_mode access_mode); |
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int rnbd_clt_unmap_device(struct rnbd_clt_dev *dev, bool force, |
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const struct attribute *sysfs_self); |
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int rnbd_clt_remap_device(struct rnbd_clt_dev *dev); |
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int rnbd_clt_resize_disk(struct rnbd_clt_dev *dev, size_t newsize); |
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/* rnbd-clt-sysfs.c */ |
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int rnbd_clt_create_sysfs_files(void); |
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void rnbd_clt_destroy_sysfs_files(void); |
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void rnbd_clt_destroy_default_group(void); |
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void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev); |
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#endif /* RNBD_CLT_H */
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