1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * RDMA Network Block Driver
5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
13 #include <linux/wait.h>
15 #include <linux/inet.h>
16 #include <linux/blk-mq.h>
17 #include <linux/refcount.h>
20 #include "rnbd-proto.h"
23 /* Max. number of segments per IO request, Mellanox Connect X ~ Connect X5,
24 * choose minimial 30 for all, minus 1 for internal protocol, so 29.
26 #define BMAX_SEGMENTS 29
27 /* time in seconds between reconnect tries, default to 30 s */
28 #define RECONNECT_DELAY 30
30 * Number of times to reconnect on error before giving up, 0 for * disabled,
33 #define MAX_RECONNECTS -1
35 enum rnbd_clt_dev_state {
38 DEV_STATE_MAPPED_DISCONNECTED,
43 wait_queue_head_t wait;
47 #ifdef CONFIG_ARCH_NO_SG_CHAIN
48 #define RNBD_INLINE_SG_CNT 0
50 #define RNBD_INLINE_SG_CNT 2
52 #define RNBD_RDMA_SGL_SIZE (sizeof(struct scatterlist) * RNBD_INLINE_SG_CNT)
56 struct request *rq; /* for block io */
57 void *buf; /* for user messages */
59 struct rtrs_permit *permit;
61 /* use to send msg associated with a dev */
62 struct rnbd_clt_dev *dev;
63 /* use to send msg associated with a sess */
64 struct rnbd_clt_session *sess;
67 struct work_struct work;
69 struct rnbd_iu_comp comp;
71 struct scatterlist first_sgl[]; /* must be the last one */
74 struct rnbd_cpu_qlist {
75 struct list_head requeue_list;
76 spinlock_t requeue_lock;
80 struct rnbd_clt_session {
81 struct list_head list;
82 struct rtrs_clt *rtrs;
83 wait_queue_head_t rtrs_waitq;
85 struct rnbd_cpu_qlist __percpu
87 DECLARE_BITMAP(cpu_queues_bm, NR_CPUS);
88 int __percpu *cpu_rr; /* per-cpu var for CPU round-robin */
92 struct blk_mq_tag_set tag_set;
93 struct mutex lock; /* protects state and devs_list */
94 struct list_head devs_list; /* list of struct rnbd_clt_dev */
96 char sessname[NAME_MAX];
97 u8 ver; /* protocol version */
104 struct list_head requeue_list;
105 unsigned long in_list;
106 struct rnbd_clt_dev *dev;
107 struct blk_mq_hw_ctx *hctx;
110 struct rnbd_clt_dev {
111 struct rnbd_clt_session *sess;
112 struct request_queue *queue;
113 struct rnbd_queue *hw_queues;
115 /* local Idr index - used to track minor number allocations. */
118 enum rnbd_clt_dev_state dev_state;
120 enum rnbd_access_mode access_mode;
126 u32 max_write_same_sectors;
127 u32 max_discard_sectors;
128 u32 discard_granularity;
129 u32 discard_alignment;
131 u16 physical_block_size;
132 u16 logical_block_size;
135 u64 size; /* device size in bytes */
136 struct list_head list;
139 char *blk_symlink_name;
141 struct work_struct unmap_on_rmmod_work;
146 struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
147 struct rtrs_addr *paths,
148 size_t path_cnt, u16 port_nr,
149 const char *pathname,
150 enum rnbd_access_mode access_mode);
151 int rnbd_clt_unmap_device(struct rnbd_clt_dev *dev, bool force,
152 const struct attribute *sysfs_self);
154 int rnbd_clt_remap_device(struct rnbd_clt_dev *dev);
155 int rnbd_clt_resize_disk(struct rnbd_clt_dev *dev, size_t newsize);
157 /* rnbd-clt-sysfs.c */
159 int rnbd_clt_create_sysfs_files(void);
161 void rnbd_clt_destroy_sysfs_files(void);
162 void rnbd_clt_destroy_default_group(void);
164 void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev);
166 #endif /* RNBD_CLT_H */