This header describes main structs and functions used by ibnbd-client
module, mainly for managing IBNBD sessions and mapped block devices,
creating and destroying sysfs entries.

Signed-off-by: Roman Pen <roman.peny...@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kip...@profitbricks.com>
Cc: Jack Wang <jinpu.w...@profitbricks.com>
---
 drivers/block/ibnbd/ibnbd-clt.h | 193 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)

diff --git a/drivers/block/ibnbd/ibnbd-clt.h b/drivers/block/ibnbd/ibnbd-clt.h
new file mode 100644
index 000000000000..b3d72b2962dd
--- /dev/null
+++ b/drivers/block/ibnbd/ibnbd-clt.h
@@ -0,0 +1,193 @@
+/*
+ * InfiniBand Network Block Driver
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler <m...@fholler.de>
+ *          Jack Wang <jinpu.w...@profitbricks.com>
+ *          Kleber Souza <kleber.so...@profitbricks.com>
+ *          Danil Kipnis <danil.kip...@profitbricks.com>
+ *          Roman Penyaev <roman.peny...@profitbricks.com>
+ *          Milind Dumbare <milind.dumb...@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kip...@profitbricks.com>
+ *          Roman Penyaev <roman.peny...@profitbricks.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef IBNBD_CLT_H
+#define IBNBD_CLT_H
+
+#include <linux/wait.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/blk-mq.h>
+#include <linux/refcount.h>
+
+#include "ibtrs.h"
+#include "ibnbd-proto.h"
+#include "ibnbd-log.h"
+
+#define BMAX_SEGMENTS 31
+#define RECONNECT_DELAY 30
+#define MAX_RECONNECTS -1
+
+enum ibnbd_clt_dev_state {
+       DEV_STATE_INIT,
+       DEV_STATE_MAPPED,
+       DEV_STATE_MAPPED_DISCONNECTED,
+       DEV_STATE_UNMAPPED,
+};
+
+enum ibnbd_queue_mode {
+       BLK_MQ,
+       BLK_RQ
+};
+
+struct ibnbd_iu_comp {
+       wait_queue_head_t wait;
+       int errno;
+};
+
+struct ibnbd_iu {
+       union {
+               struct request *rq; /* for block io */
+               void *buf; /* for user messages */
+       };
+       struct ibtrs_tag        *tag;
+       union {
+               /* use to send msg associated with a dev */
+               struct ibnbd_clt_dev *dev;
+               /* use to send msg associated with a sess */
+               struct ibnbd_clt_session *sess;
+       };
+       blk_status_t            status;
+       struct scatterlist      sglist[BMAX_SEGMENTS];
+       struct work_struct      work;
+       int                     errno;
+       struct ibnbd_iu_comp    *comp;
+};
+
+struct ibnbd_cpu_qlist {
+       struct list_head        requeue_list;
+       spinlock_t              requeue_lock;
+       unsigned int            cpu;
+};
+
+struct ibnbd_clt_session {
+       struct list_head        list;
+       struct ibtrs_clt        *ibtrs;
+       wait_queue_head_t       ibtrs_waitq;
+       bool                    ibtrs_ready;
+       struct ibnbd_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;
+       int                     queue_depth;
+       u32                     max_io_size;
+       struct blk_mq_tag_set   tag_set;
+       struct mutex            lock; /* protects state and devs_list */
+       struct list_head        devs_list; /* list of struct ibnbd_clt_dev */
+       refcount_t              refcount;
+       char                    sessname[NAME_MAX];
+       u8                      ver; /* protocol version */
+};
+
+/**
+ * Submission queues.
+ */
+struct ibnbd_queue {
+       struct list_head        requeue_list;
+       unsigned long           in_list;
+       struct ibnbd_clt_dev    *dev;
+       struct blk_mq_hw_ctx    *hctx;
+};
+
+struct ibnbd_clt_dev {
+       struct ibnbd_clt_session        *sess;
+       struct request_queue    *queue;
+       struct ibnbd_queue      *hw_queues;
+       struct delayed_work     rq_delay_work;
+       u32                     device_id;
+       /* local Idr index - used to track minor number allocations. */
+       u32                     clt_device_id;
+       struct mutex            lock;
+       enum ibnbd_clt_dev_state        dev_state;
+       enum ibnbd_queue_mode   queue_mode;
+       enum ibnbd_io_mode      io_mode; /* user requested */
+       enum ibnbd_io_mode      remote_io_mode; /* server really used */
+       char                    pathname[NAME_MAX];
+       enum ibnbd_access_mode  access_mode;
+       bool                    read_only;
+       bool                    rotational;
+       u32                     max_hw_sectors;
+       u32                     max_write_same_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[NAME_MAX];
+       refcount_t              refcount;
+       struct work_struct      unmap_on_rmmod_work;
+};
+
+static inline const char *ibnbd_queue_mode_str(enum ibnbd_queue_mode mode)
+{
+       switch (mode) {
+       case BLK_RQ:
+               return "rq";
+       case BLK_MQ:
+               return "mq";
+       default:
+               return "unknown";
+       }
+}
+
+/* ibnbd-clt.c */
+
+struct ibnbd_clt_dev *ibnbd_clt_map_device(const char *sessname,
+                                          struct ibtrs_addr *paths,
+                                          size_t path_cnt,
+                                          const char *pathname,
+                                          enum ibnbd_access_mode access_mode,
+                                          enum ibnbd_queue_mode queue_mode,
+                                          enum ibnbd_io_mode io_mode);
+int ibnbd_clt_unmap_device(struct ibnbd_clt_dev *dev, bool force,
+                          const struct attribute *sysfs_self);
+
+int ibnbd_clt_remap_device(struct ibnbd_clt_dev *dev);
+int ibnbd_clt_resize_disk(struct ibnbd_clt_dev *dev, size_t newsize);
+
+/* ibnbd-clt-sysfs.c */
+
+int ibnbd_clt_create_sysfs_files(void);
+
+void ibnbd_clt_destroy_sysfs_files(void);
+void ibnbd_clt_destroy_default_group(void);
+
+void ibnbd_clt_remove_dev_symlink(struct ibnbd_clt_dev *dev);
+void ibnbd_sysfs_remove_file_self(struct kobject *kobj,
+                                 const struct attribute *attr);
+
+#endif /* IBNBD_CLT_H */
-- 
2.13.1

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