summaryrefslogtreecommitdiff
path: root/drivers/block/rnbd/rnbd-clt.h
blob: 26fb91d800e31ecb6f6dc658da123ae5e7922045 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * RDMA Network Block Driver
 *
 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
 */

#ifndef RNBD_CLT_H
#define RNBD_CLT_H

#include <linux/wait.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/blk-mq.h>
#include <linux/refcount.h>

#include <rtrs.h>
#include "rnbd-proto.h"
#include "rnbd-log.h"

/*  time in seconds between reconnect tries, default to 30 s */
#define RECONNECT_DELAY 30
/*
 * Number of times to reconnect on error before giving up, 0 for * disabled,
 * -1 for forever
 */
#define MAX_RECONNECTS -1

enum rnbd_clt_dev_state {
	DEV_STATE_INIT,
	DEV_STATE_MAPPED,
	DEV_STATE_MAPPED_DISCONNECTED,
	DEV_STATE_UNMAPPED,
};

struct rnbd_iu_comp {
	wait_queue_head_t wait;
	int errno;
};

#ifdef CONFIG_ARCH_NO_SG_CHAIN
#define RNBD_INLINE_SG_CNT 0
#else
#define RNBD_INLINE_SG_CNT 2
#endif
#define RNBD_RDMA_SGL_SIZE (sizeof(struct scatterlist) * RNBD_INLINE_SG_CNT)

struct rnbd_iu {
	union {
		struct request *rq; /* for block io */
		void *buf; /* for user messages */
	};
	struct rtrs_permit	*permit;
	union {
		/* use to send msg associated with a dev */
		struct rnbd_clt_dev *dev;
		/* use to send msg associated with a sess */
		struct rnbd_clt_session *sess;
	};
	struct sg_table		sgt;
	struct work_struct	work;
	int			errno;
	struct rnbd_iu_comp	comp;
	atomic_t		refcount;
	struct scatterlist	first_sgl[]; /* must be the last one */
};

struct rnbd_cpu_qlist {
	struct list_head	requeue_list;
	spinlock_t		requeue_lock;
	unsigned int		cpu;
};

struct rnbd_clt_session {
	struct list_head        list;
	struct rtrs_clt_sess        *rtrs;
	wait_queue_head_t       rtrs_waitq;
	bool                    rtrs_ready;
	struct rnbd_cpu_qlist	__percpu
				*cpu_queues;
	DECLARE_BITMAP(cpu_queues_bm, NR_CPUS);
	int	__percpu	*cpu_rr; /* per-cpu var for CPU round-robin */
	atomic_t		busy;
	size_t			queue_depth;
	u32			max_io_size;
	u32			max_segments;
	struct blk_mq_tag_set	tag_set;
	u32			nr_poll_queues;
	struct mutex		lock; /* protects state and devs_list */
	struct list_head        devs_list; /* list of struct rnbd_clt_dev */
	refcount_t		refcount;
	char			sessname[NAME_MAX];
	u8			ver; /* protocol version */
};

/**
 * Submission queues.
 */
struct rnbd_queue {
	struct list_head	requeue_list;
	unsigned long		in_list;
	struct rnbd_clt_dev	*dev;
	struct blk_mq_hw_ctx	*hctx;
};

struct rnbd_clt_dev {
	struct rnbd_clt_session	*sess;
	struct request_queue	*queue;
	struct rnbd_queue	*hw_queues;
	u32			device_id;
	/* local Idr index - used to track minor number allocations. */
	u32			clt_device_id;
	struct mutex		lock;
	enum rnbd_clt_dev_state	dev_state;
	char			*pathname;
	enum rnbd_access_mode	access_mode;
	u32			nr_poll_queues;
	bool			wc;
	bool			fua;
	u32			max_hw_sectors;
	u32			max_discard_sectors;
	u32			discard_granularity;
	u32			discard_alignment;
	u16			secure_discard;
	u16			physical_block_size;
	u16			logical_block_size;
	u16			max_segments;
	size_t			nsectors;
	u64			size;		/* device size in bytes */
	struct list_head        list;
	struct gendisk		*gd;
	struct kobject		kobj;
	char			*blk_symlink_name;
	refcount_t		refcount;
	struct work_struct	unmap_on_rmmod_work;
};

/* rnbd-clt.c */

struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
					   struct rtrs_addr *paths,
					   size_t path_cnt, u16 port_nr,
					   const char *pathname,
					   enum rnbd_access_mode access_mode,
					   u32 nr_poll_queues);
int rnbd_clt_unmap_device(struct rnbd_clt_dev *dev, bool force,
			   const struct attribute *sysfs_self);

int rnbd_clt_remap_device(struct rnbd_clt_dev *dev);
int rnbd_clt_resize_disk(struct rnbd_clt_dev *dev, size_t newsize);

/* rnbd-clt-sysfs.c */

int rnbd_clt_create_sysfs_files(void);

void rnbd_clt_destroy_sysfs_files(void);

void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev);

#endif /* RNBD_CLT_H */