diff --git a/drivers/infiniband/ulp/ibtrs/ibtrs.h b/drivers/infiniband/ulp/ibtrs/ibtrs.h
new file mode 100644
index 000000000000..747cdde3d9cf
--- /dev/null
+++ b/drivers/infiniband/ulp/ibtrs/ibtrs.h
@@ -0,0 +1,331 @@
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler <mail@fholler.de>
+ *          Jack Wang <jinpu.wang@profitbricks.com>
+ *          Kleber Souza <kleber.souza@profitbricks.com>
+ *          Danil Kipnis <danil.kipnis@profitbricks.com>
+ *          Roman Penyaev <roman.penyaev@profitbricks.com>
+ *          Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kipnis@profitbricks.com>
+ *          Roman Penyaev <roman.penyaev@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 IBTRS_H
+#define IBTRS_H
+
+#include <linux/socket.h>
+#include <linux/scatterlist.h>
+
+struct ibtrs_clt;
+struct ibtrs_srv_ctx;
+struct ibtrs_srv;
+struct ibtrs_srv_op;
+
+/*
+ * Here goes IBTRS client API
+ */
+
+/**
+ * enum ibtrs_clt_link_ev - Events about connectivity state of a client
+ * @IBTRS_CLT_LINK_EV_RECONNECTED	Client was reconnected.
+ * @IBTRS_CLT_LINK_EV_DISCONNECTED	Client was disconnected.
+ */
+enum ibtrs_clt_link_ev {
+	IBTRS_CLT_LINK_EV_RECONNECTED,
+	IBTRS_CLT_LINK_EV_DISCONNECTED,
+};
+
+/**
+ * Source and destination address of a path to be established
+ */
+struct ibtrs_addr {
+	struct sockaddr *src;
+	struct sockaddr *dst;
+};
+
+typedef void (link_clt_ev_fn)(void *priv, enum ibtrs_clt_link_ev ev);
+/**
+ * ibtrs_clt_open() - Open a session to a IBTRS client
+ * @priv:		User supplied private data.
+ * @link_ev:		Event notification for connection state changes
+ *	@priv:			user supplied data that was passed to
+ *				ibtrs_clt_open()
+ *	@ev:			Occurred event
+ * @sessname: name of the session
+ * @paths: Paths to be established defined by their src and dst addresses
+ * @path_cnt: Number of elemnts in the @paths array
+ * @port: port to be used by the IBTRS session
+ * @pdu_sz: Size of extra payload which can be accessed after tag allocation.
+ * @max_inflight_msg: Max. number of parallel inflight messages for the session
+ * @max_segments: Max. number of segments per IO request
+ * @reconnect_delay_sec: time between reconnect tries
+ * @max_reconnect_attempts: Number of times to reconnect on error before giving
+ *			    up, 0 for * disabled, -1 for forever
+ *
+ * Starts session establishment with the ibtrs_server. The function can block
+ * up to ~2000ms until it returns.
+ *
+ * Return a valid pointer on success otherwise PTR_ERR.
+ */
+struct ibtrs_clt *ibtrs_clt_open(void *priv, link_clt_ev_fn *link_ev,
+				 const char *sessname,
+				 const struct ibtrs_addr *paths,
+				 size_t path_cnt, short port,
+				 size_t pdu_sz, u8 reconnect_delay_sec,
+				 u16 max_segments,
+				 s16 max_reconnect_attempts);
+
+/**
+ * ibtrs_clt_close() - Close a session
+ * @sess: Session handler, is freed on return
+ */
+void ibtrs_clt_close(struct ibtrs_clt *sess);
+
+enum {
+	IBTRS_TAG_NOWAIT = 0,
+	IBTRS_TAG_WAIT   = 1,
+};
+
+/**
+ * enum ibtrs_clt_con_type() type of ib connection to use with a given tag
+ * @USR_CON - use connection reserved vor "service" messages
+ * @IO_CON - use a connection reserved for IO
+ */
+enum ibtrs_clt_con_type {
+	IBTRS_USR_CON,
+	IBTRS_IO_CON
+};
+
+/**
+ * ibtrs_tag - tags the memory allocation for future RDMA operation
+ */
+struct ibtrs_tag {
+	enum ibtrs_clt_con_type con_type;
+	unsigned int cpu_id;
+	unsigned int mem_id;
+	unsigned int mem_off;
+};
+
+static inline struct ibtrs_tag *ibtrs_tag_from_pdu(void *pdu)
+{
+	return pdu - sizeof(struct ibtrs_tag);
+}
+
+static inline void *ibtrs_tag_to_pdu(struct ibtrs_tag *tag)
+{
+	return tag + 1;
+}
+
+/**
+ * ibtrs_clt_get_tag() - allocates tag for future RDMA operation
+ * @sess:	Current session
+ * @con_type:	Type of connection to use with the tag
+ * @wait:	Wait type
+ *
+ * Description:
+ *    Allocates tag for the following RDMA operation.  Tag is used
+ *    to preallocate all resources and to propagate memory pressure
+ *    up earlier.
+ *
+ * Context:
+ *    Can sleep if @wait == IBTRS_TAG_WAIT
+ */
+struct ibtrs_tag *ibtrs_clt_get_tag(struct ibtrs_clt *sess,
+				    enum ibtrs_clt_con_type con_type,
+				    int wait);
+
+/**
+ * ibtrs_clt_put_tag() - puts allocated tag
+ * @sess:	Current session
+ * @tag:	Tag to be freed
+ *
+ * Context:
+ *    Does not matter
+ */
+void ibtrs_clt_put_tag(struct ibtrs_clt *sess, struct ibtrs_tag *tag);
+
+typedef void (ibtrs_conf_fn)(void *priv, int errno);
+/**
+ * ibtrs_clt_request() - Request data transfer to/from server via RDMA.
+ *
+ * @dir:	READ/WRITE
+ * @conf:	callback function to be called as confirmation
+ * @sess:	Session
+ * @tag:	Preallocated tag
+ * @priv:	User provided data, passed back with corresponding
+ *		@(conf) confirmation.
+ * @vec:	Message that is send to server together with the request.
+ *		Sum of len of all @vec elements limited to <= IO_MSG_SIZE.
+ *		Since the msg is copied internally it can be allocated on stack.
+ * @nr:		Number of elements in @vec.
+ * @len:	length of data send to/from server
+ * @sg:		Pages to be sent/received to/from server.
+ * @sg_cnt:	Number of elements in the @sg
+ *
+ * Return:
+ * 0:		Success
+ * <0:		Error
+ *
+ * On dir=READ ibtrs client will request a data transfer from Server to client.
+ * The data that the server will respond with will be stored in @sg when
+ * the user receives an %IBTRS_CLT_RDMA_EV_RDMA_REQUEST_WRITE_COMPL event.
+ * On dir=WRITE ibtrs client will rdma write data in sg to server side.
+ */
+int ibtrs_clt_request(int dir, ibtrs_conf_fn *conf, struct ibtrs_clt *sess,
+		      struct ibtrs_tag *tag, void *priv, const struct kvec *vec,
+		      size_t nr, size_t len, struct scatterlist *sg,
+		      unsigned int sg_cnt);
+
+/**
+ * ibtrs_attrs - IBTRS session attributes
+ */
+struct ibtrs_attrs {
+	u32	queue_depth;
+	u32	max_io_size;
+	u8	sessname[NAME_MAX];
+};
+
+/**
+ * ibtrs_clt_query() - queries IBTRS session attributes
+ *
+ * Returns:
+ *    0 on success
+ *    -ECOMM		no connection to the server
+ */
+int ibtrs_clt_query(struct ibtrs_clt *sess, struct ibtrs_attrs *attr);
+
+/*
+ * Here goes IBTRS server API
+ */
+
+/**
+ * enum ibtrs_srv_link_ev - Server link events
+ * @IBTRS_SRV_LINK_EV_CONNECTED:	Connection from client established
+ * @IBTRS_SRV_LINK_EV_DISCONNECTED:	Connection was disconnected, all
+ *					connection IBTRS resources were freed.
+ */
+enum ibtrs_srv_link_ev {
+	IBTRS_SRV_LINK_EV_CONNECTED,
+	IBTRS_SRV_LINK_EV_DISCONNECTED,
+};
+
+/**
+ * rdma_ev_fn():	Event notification for RDMA operations
+ *			If the callback returns a value != 0, an error message
+ *			for the data transfer will be sent to the client.
+
+ *	@sess:		Session
+ *	@priv:		Private data set by ibtrs_srv_set_sess_priv()
+ *	@id:		internal IBTRS operation id
+ *	@dir:		READ/WRITE
+ *	@data:		Pointer to (bidirectional) rdma memory area:
+ *			- in case of %IBTRS_SRV_RDMA_EV_RECV contains
+ *			data sent by the client
+ *			- in case of %IBTRS_SRV_RDMA_EV_WRITE_REQ points to the
+ *			memory area where the response is to be written to
+ *	@datalen:	Size of the memory area in @data
+ *	@usr:		The extra user message sent by the client (%vec)
+ *	@usrlen:	Size of the user message
+ */
+typedef int (rdma_ev_fn)(struct ibtrs_srv *sess, void *priv,
+			 struct ibtrs_srv_op *id, int dir,
+			 void *data, size_t datalen, const void *usr,
+			 size_t usrlen);
+
+/**
+ * link_ev_fn():	Events about connective state changes
+ *			If the callback returns != 0 and the event
+ *			%IBTRS_SRV_LINK_EV_CONNECTED the corresponding session
+ *			will be destroyed.
+ *	@sess:		Session
+ *	@ev:		event
+ *	@priv:		Private data from user if previously set with
+ *			ibtrs_srv_set_sess_priv()
+ */
+typedef int (link_ev_fn)(struct ibtrs_srv *sess, enum ibtrs_srv_link_ev ev,
+			 void *priv);
+
+/**
+ * ibtrs_srv_open() - open IBTRS server context
+ * @ops:		callback functions
+ *
+ * Creates server context with specified callbacks.
+ *
+ * Return a valid pointer on success otherwise PTR_ERR.
+ */
+struct ibtrs_srv_ctx *ibtrs_srv_open(rdma_ev_fn *rdma_ev, link_ev_fn *link_ev,
+				     unsigned int port);
+
+/**
+ * ibtrs_srv_close() - close IBTRS server context
+ * @ctx: pointer to server context
+ *
+ * Closes IBTRS server context with all client sessions.
+ */
+void ibtrs_srv_close(struct ibtrs_srv_ctx *ctx);
+
+/**
+ * ibtrs_srv_resp_rdma() - Finish an RDMA request
+ *
+ * @id:		Internal IBTRS operation identifier
+ * @errno:	Response Code send to the other side for this operation.
+ *		0 = success, <=0 error
+ *
+ * Finish a RDMA operation. A message is sent to the client and the
+ * corresponding memory areas will be released.
+ */
+void ibtrs_srv_resp_rdma(struct ibtrs_srv_op *id, int errno);
+
+/**
+ * ibtrs_srv_set_sess_priv() - Set private pointer in ibtrs_srv.
+ * @sess:	Session
+ * @priv:	The private pointer that is associated with the session.
+ */
+void ibtrs_srv_set_sess_priv(struct ibtrs_srv *sess, void *priv);
+
+/**
+ * ibtrs_srv_get_sess_qdepth() - Get ibtrs_srv qdepth.
+ * @sess:	Session
+ */
+int ibtrs_srv_get_queue_depth(struct ibtrs_srv *sess);
+
+/**
+ * ibtrs_srv_get_sess_name() - Get ibtrs_srv peer hostname.
+ * @sess:	Session
+ * @sessname:	Sessname buffer
+ * @len:	Length of sessname buffer
+ */
+int ibtrs_srv_get_sess_name(struct ibtrs_srv *sess, char *sessname, size_t len);
+
+/**
+ * ibtrs_addr_to_sockaddr() - convert path string "src,dst" to sockaddreses
+ * @str		string containing source and destination addr of a path
+ *		separated by comma. I.e. "ip:1.1.1.1,ip:1.1.1.2". If str
+ *		contains only one address it's considered to be destination.
+ * @len		string length
+ * @addr->dst	will be set to the destination sockadddr.
+ * @addr->src	will be set to the source address or to NULL
+ *		if str doesn't contain any sorce address.
+ *
+ * Returns zero if conversion successful. Non-zero otherwise.
+ */
+int ibtrs_addr_to_sockaddr(const char *str, size_t len, short port,
+			   struct ibtrs_addr *addr);
+#endif
