152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/* 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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/* 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_sess *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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u32 max_segments;
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struct blk_mq_tag_set tag_set;
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u32 nr_poll_queues;
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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 kobject kobj;
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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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refcount_t refcount;
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char *pathname;
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enum rnbd_access_mode access_mode;
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u32 nr_poll_queues;
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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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char *blk_symlink_name;
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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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u32 nr_poll_queues);
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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, sector_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_remove_dev_symlink(struct rnbd_clt_dev *dev);
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#endif /* RNBD_CLT_H */
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