new file mode 100644
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Transport Layer
+ *
+ * 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 RTRS_LOG_H
+#define RTRS_LOG_H
+
+#define rtrs_log(fn, obj, fmt, ...) \
+ fn("<%s>: " fmt, obj->sessname, ##__VA_ARGS__)
+
+#define rtrs_err(obj, fmt, ...) \
+ rtrs_log(pr_err, obj, fmt, ##__VA_ARGS__)
+#define rtrs_err_rl(obj, fmt, ...) \
+ rtrs_log(pr_err_ratelimited, obj, fmt, ##__VA_ARGS__)
+#define rtrs_wrn(obj, fmt, ...) \
+ rtrs_log(pr_warn, obj, fmt, ##__VA_ARGS__)
+#define rtrs_wrn_rl(obj, fmt, ...) \
+ rtrs_log(pr_warn_ratelimited, obj, fmt, ##__VA_ARGS__)
+#define rtrs_info(obj, fmt, ...) \
+ rtrs_log(pr_info, obj, fmt, ##__VA_ARGS__)
+#define rtrs_info_rl(obj, fmt, ...) \
+ rtrs_log(pr_info_ratelimited, obj, fmt, ##__VA_ARGS__)
+
+#endif /* RTRS_LOG_H */
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Transport Layer
+ *
+ * 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 RTRS_PRI_H
+#define RTRS_PRI_H
+
+#include <linux/uuid.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib.h>
+
+#include "rtrs.h"
+
+#define RTRS_PROTO_VER_MAJOR 2
+#define RTRS_PROTO_VER_MINOR 0
+
+#define RTRS_PROTO_VER_STRING __stringify(RTRS_PROTO_VER_MAJOR) "." \
+ __stringify(RTRS_PROTO_VER_MINOR)
+
+enum rtrs_imm_const {
+ MAX_IMM_TYPE_BITS = 4,
+ MAX_IMM_TYPE_MASK = ((1 << MAX_IMM_TYPE_BITS) - 1),
+ MAX_IMM_PAYL_BITS = 28,
+ MAX_IMM_PAYL_MASK = ((1 << MAX_IMM_PAYL_BITS) - 1),
+};
+
+enum rtrs_imm_type {
+ RTRS_IO_REQ_IMM = 0, /* client to server */
+ RTRS_IO_RSP_IMM = 1, /* server to client */
+ RTRS_IO_RSP_W_INV_IMM = 2, /* server to client */
+
+ RTRS_HB_MSG_IMM = 8, /* HB: HeartBeat */
+ RTRS_HB_ACK_IMM = 9,
+
+ RTRS_LAST_IMM,
+};
+
+enum {
+ SERVICE_CON_QUEUE_DEPTH = 512,
+
+ MAX_PATHS_NUM = 128,
+
+ /*
+ * With the size of struct rtrs_permit allocated on the client, 4K
+ * is the maximum number of rtrs_permits we can allocate. This number is
+ * also used on the client to allocate the IU for the user connection
+ * to receive the RDMA addresses from the server.
+ */
+ MAX_SESS_QUEUE_DEPTH = 4096,
+
+ RTRS_HB_INTERVAL_MS = 5000,
+ RTRS_HB_MISSED_MAX = 5,
+
+ RTRS_MAGIC = 0x1BBD,
+ RTRS_PROTO_VER = (RTRS_PROTO_VER_MAJOR << 8) | RTRS_PROTO_VER_MINOR,
+};
+
+struct rtrs_ib_dev;
+
+struct rtrs_rdma_dev_pd_ops {
+ struct rtrs_ib_dev *(*alloc)(void);
+ void (*free)(struct rtrs_ib_dev *dev);
+ int (*init)(struct rtrs_ib_dev *dev);
+ void (*deinit)(struct rtrs_ib_dev *dev);
+};
+
+struct rtrs_rdma_dev_pd {
+ struct mutex mutex;
+ struct list_head list;
+ enum ib_pd_flags pd_flags;
+ const struct rtrs_rdma_dev_pd_ops *ops;
+};
+
+struct rtrs_ib_dev {
+ struct ib_device *ib_dev;
+ struct ib_pd *ib_pd;
+ struct kref ref;
+ struct list_head entry;
+ struct rtrs_rdma_dev_pd *pool;
+};
+
+struct rtrs_con {
+ struct rtrs_sess *sess;
+ struct ib_qp *qp;
+ struct ib_cq *cq;
+ struct rdma_cm_id *cm_id;
+ unsigned int cid;
+};
+
+struct rtrs_sess {
+ struct list_head entry;
+ struct sockaddr_storage dst_addr;
+ struct sockaddr_storage src_addr;
+ char sessname[NAME_MAX];
+ uuid_t uuid;
+ struct rtrs_con **con;
+ unsigned int con_num;
+ unsigned int recon_cnt;
+ struct rtrs_ib_dev *dev;
+ int dev_ref;
+ struct ib_cqe *hb_cqe;
+ void (*hb_err_handler)(struct rtrs_con *con);
+ struct workqueue_struct *hb_wq;
+ struct delayed_work hb_dwork;
+ unsigned int hb_interval_ms;
+ unsigned int hb_missed_cnt;
+ unsigned int hb_missed_max;
+};
+
+/* rtrs information unit */
+struct rtrs_iu {
+ struct list_head list;
+ struct ib_cqe cqe;
+ dma_addr_t dma_addr;
+ void *buf;
+ size_t size;
+ enum dma_data_direction direction;
+};
+
+/**
+ * enum rtrs_msg_types - RTRS message types, see also rtrs/README
+ * @RTRS_MSG_INFO_REQ: Client additional info request to the server
+ * @RTRS_MSG_INFO_RSP: Server additional info response to the client
+ * @RTRS_MSG_WRITE: Client writes data per RDMA to server
+ * @RTRS_MSG_READ: Client requests data transfer from server
+ * @RTRS_MSG_RKEY_RSP: Server refreshed rkey for rbuf
+ */
+enum rtrs_msg_types {
+ RTRS_MSG_INFO_REQ,
+ RTRS_MSG_INFO_RSP,
+ RTRS_MSG_WRITE,
+ RTRS_MSG_READ,
+ RTRS_MSG_RKEY_RSP,
+};
+
+/**
+ * enum rtrs_msg_flags - RTRS message flags.
+ * @RTRS_NEED_INVAL: Send invalidation in response.
+ * @RTRS_MSG_NEW_RKEY_F: Send refreshed rkey in response.
+ */
+enum rtrs_msg_flags {
+ RTRS_MSG_NEED_INVAL_F = 1 << 0,
+ RTRS_MSG_NEW_RKEY_F = 1 << 1,
+};
+
+/**
+ * struct rtrs_sg_desc - RDMA-Buffer entry description
+ * @addr: Address of RDMA destination buffer
+ * @key: Authorization rkey to write to the buffer
+ * @len: Size of the buffer
+ */
+struct rtrs_sg_desc {
+ __le64 addr;
+ __le32 key;
+ __le32 len;
+};
+
+/**
+ * struct rtrs_msg_conn_req - Client connection request to the server
+ * @magic: RTRS magic
+ * @version: RTRS protocol version
+ * @cid: Current connection id
+ * @cid_num: Number of connections per session
+ * @recon_cnt: Reconnections counter
+ * @sess_uuid: UUID of a session (path)
+ * @paths_uuid: UUID of a group of sessions (paths)
+ *
+ * NOTE: max size 56 bytes, see man rdma_connect().
+ */
+struct rtrs_msg_conn_req {
+ /* Is set to 0 by cma.c in case of AF_IB, do not touch that.
+ * see https://www.spinics.net/lists/linux-rdma/msg22397.html
+ */
+ u8 __cma_version;
+ /* On sender side that should be set to 0, or cma_save_ip_info()
+ * extract garbage and will fail.
+ */
+ u8 __ip_version;
+ __le16 magic;
+ __le16 version;
+ __le16 cid;
+ __le16 cid_num;
+ __le16 recon_cnt;
+ uuid_t sess_uuid;
+ uuid_t paths_uuid;
+ u8 reserved[12];
+};
+
+/**
+ * struct rtrs_msg_conn_rsp - Server connection response to the client
+ * @magic: RTRS magic
+ * @version: RTRS protocol version
+ * @errno: If rdma_accept() then 0, if rdma_reject() indicates error
+ * @queue_depth: max inflight messages (queue-depth) in this session
+ * @max_io_size: max io size server supports
+ * @max_hdr_size: max msg header size server supports
+ *
+ * NOTE: size is 56 bytes, max possible is 136 bytes, see man rdma_accept().
+ */
+struct rtrs_msg_conn_rsp {
+ __le16 magic;
+ __le16 version;
+ __le16 errno;
+ __le16 queue_depth;
+ __le32 max_io_size;
+ __le32 max_hdr_size;
+ __le32 flags;
+ u8 reserved[36];
+};
+
+/**
+ * struct rtrs_msg_info_req
+ * @type: @RTRS_MSG_INFO_REQ
+ * @sessname: Session name chosen by client
+ */
+struct rtrs_msg_info_req {
+ __le16 type;
+ u8 sessname[NAME_MAX];
+ u8 reserved[15];
+};
+
+/**
+ * struct rtrs_msg_info_rsp
+ * @type: @RTRS_MSG_INFO_RSP
+ * @sg_cnt: Number of @desc entries
+ * @desc: RDMA buffers where the client can write to server
+ */
+struct rtrs_msg_info_rsp {
+ __le16 type;
+ __le16 sg_cnt;
+ u8 reserved[4];
+ struct rtrs_sg_desc desc[];
+};
+
+/**
+ * struct rtrs_msg_rkey_rsp
+ * @type: @RTRS_MSG_RKEY_RSP
+ * @buf_id: RDMA buf_id of the new rkey
+ * @rkey: new remote key for RDMA buffers id from server
+ */
+struct rtrs_msg_rkey_rsp {
+ __le16 type;
+ __le16 buf_id;
+ __le32 rkey;
+};
+
+/**
+ * struct rtrs_msg_rdma_read - RDMA data transfer request from client
+ * @type: always @RTRS_MSG_READ
+ * @usr_len: length of user payload
+ * @sg_cnt: number of @desc entries
+ * @desc: RDMA buffers where the server can write the result to
+ */
+struct rtrs_msg_rdma_read {
+ __le16 type;
+ __le16 usr_len;
+ __le16 flags;
+ __le16 sg_cnt;
+ struct rtrs_sg_desc desc[];
+};
+
+/**
+ * struct_msg_rdma_write - Message transferred to server with RDMA-Write
+ * @type: always @RTRS_MSG_WRITE
+ * @usr_len: length of user payload
+ */
+struct rtrs_msg_rdma_write {
+ __le16 type;
+ __le16 usr_len;
+};
+
+/**
+ * struct_msg_rdma_hdr - header for read or write request
+ * @type: @RTRS_MSG_WRITE | @RTRS_MSG_READ
+ */
+struct rtrs_msg_rdma_hdr {
+ __le16 type;
+};
+
+/* rtrs.c */
+
+struct rtrs_iu *rtrs_iu_alloc(u32 queue_size, size_t size, gfp_t t,
+ struct ib_device *dev, enum dma_data_direction,
+ void (*done)(struct ib_cq *cq, struct ib_wc *wc));
+void rtrs_iu_free(struct rtrs_iu *iu, enum dma_data_direction dir,
+ struct ib_device *dev, u32 queue_size);
+int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu);
+int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
+ struct ib_send_wr *head);
+int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu,
+ struct ib_sge *sge, unsigned int num_sge,
+ u32 rkey, u64 rdma_addr, u32 imm_data,
+ enum ib_send_flags flags,
+ struct ib_send_wr *head);
+
+int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe);
+int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con, struct ib_cqe *cqe,
+ u32 imm_data, enum ib_send_flags flags,
+ struct ib_send_wr *head);
+
+int rtrs_cq_qp_create(struct rtrs_sess *rtrs_sess, struct rtrs_con *con,
+ u32 max_send_sge, int cq_vector, u16 cq_size,
+ u16 wr_queue_size, enum ib_poll_context poll_ctx);
+void rtrs_cq_qp_destroy(struct rtrs_con *con);
+
+void rtrs_init_hb(struct rtrs_sess *sess, struct ib_cqe *cqe,
+ unsigned int interval_ms, unsigned int missed_max,
+ void (*err_handler)(struct rtrs_con *con),
+ struct workqueue_struct *wq);
+void rtrs_start_hb(struct rtrs_sess *sess);
+void rtrs_stop_hb(struct rtrs_sess *sess);
+void rtrs_send_hb_ack(struct rtrs_sess *sess);
+
+void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
+ struct rtrs_rdma_dev_pd *pool);
+void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool);
+
+struct rtrs_ib_dev *rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
+ struct rtrs_rdma_dev_pd *pool);
+int rtrs_ib_dev_put(struct rtrs_ib_dev *dev);
+
+static inline u32 rtrs_to_imm(u32 type, u32 payload)
+{
+ BUILD_BUG_ON(MAX_IMM_PAYL_BITS + MAX_IMM_TYPE_BITS != 32);
+ BUILD_BUG_ON(RTRS_LAST_IMM > (1<<MAX_IMM_TYPE_BITS));
+ return ((type & MAX_IMM_TYPE_MASK) << MAX_IMM_PAYL_BITS) |
+ (payload & MAX_IMM_PAYL_MASK);
+}
+
+static inline void rtrs_from_imm(u32 imm, u32 *type, u32 *payload)
+{
+ *payload = imm & MAX_IMM_PAYL_MASK;
+ *type = imm >> MAX_IMM_PAYL_BITS;
+}
+
+static inline u32 rtrs_to_io_req_imm(u32 addr)
+{
+ return rtrs_to_imm(RTRS_IO_REQ_IMM, addr);
+}
+
+static inline u32 rtrs_to_io_rsp_imm(u32 msg_id, int errno, bool w_inval)
+{
+ enum rtrs_imm_type type;
+ u32 payload;
+
+ /* 9 bits for errno, 19 bits for msg_id */
+ payload = (abs(errno) & 0x1ff) << 19 | (msg_id & 0x7ffff);
+ type = w_inval ? RTRS_IO_RSP_W_INV_IMM : RTRS_IO_RSP_IMM;
+
+ return rtrs_to_imm(type, payload);
+}
+
+static inline void rtrs_from_io_rsp_imm(u32 payload, u32 *msg_id, int *errno)
+{
+ /* 9 bits for errno, 19 bits for msg_id */
+ *msg_id = payload & 0x7ffff;
+ *errno = -(int)((payload >> 19) & 0x1ff);
+}
+
+#define STAT_STORE_FUNC(type, set_value, reset) \
+static ssize_t set_value##_store(struct kobject *kobj, \
+ struct kobj_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ int ret = -EINVAL; \
+ type *stats = container_of(kobj, type, kobj_stats); \
+ \
+ if (sysfs_streq(buf, "1")) \
+ ret = reset(stats, true); \
+ else if (sysfs_streq(buf, "0")) \
+ ret = reset(stats, false); \
+ if (ret) \
+ return ret; \
+ \
+ return count; \
+}
+
+#define STAT_SHOW_FUNC(type, get_value, print) \
+static ssize_t get_value##_show(struct kobject *kobj, \
+ struct kobj_attribute *attr, \
+ char *page) \
+{ \
+ type *stats = container_of(kobj, type, kobj_stats); \
+ \
+ return print(stats, page, PAGE_SIZE); \
+}
+
+#define STAT_ATTR(type, stat, print, reset) \
+STAT_STORE_FUNC(type, stat, reset) \
+STAT_SHOW_FUNC(type, stat, print) \
+static struct kobj_attribute stat##_attr = __ATTR_RW(stat)
+
+#endif /* RTRS_PRI_H */