Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 188 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/rtrs/rtrs.h b/drivers/infiniband/ulp/rtrs/rtrs.h
new file mode 100644
index 000000000..b48b53a7c
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs.h
@@ -0,0 +1,188 @@
+/* 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_H
+#define RTRS_H
+
+#include <linux/socket.h>
+#include <linux/scatterlist.h>
+
+struct rtrs_permit;
+struct rtrs_clt_sess;
+struct rtrs_srv_ctx;
+struct rtrs_srv_sess;
+struct rtrs_srv_op;
+
+/*
+ * RDMA transport (RTRS) client API
+ */
+
+/**
+ * enum rtrs_clt_link_ev - Events about connectivity state of a client
+ * @RTRS_CLT_LINK_EV_RECONNECTED	Client was reconnected.
+ * @RTRS_CLT_LINK_EV_DISCONNECTED	Client was disconnected.
+ */
+enum rtrs_clt_link_ev {
+	RTRS_CLT_LINK_EV_RECONNECTED,
+	RTRS_CLT_LINK_EV_DISCONNECTED,
+};
+
+/**
+ * Source and destination address of a path to be established
+ */
+struct rtrs_addr {
+	struct sockaddr_storage *src;
+	struct sockaddr_storage *dst;
+};
+
+/**
+ * rtrs_clt_ops - it holds the link event callback and private pointer.
+ * @priv: User supplied private data.
+ * @link_ev: Event notification callback function for connection state changes
+ *	@priv: User supplied data that was passed to rtrs_clt_open()
+ *	@ev: Occurred event
+ */
+struct rtrs_clt_ops {
+	void	*priv;
+	void	(*link_ev)(void *priv, enum rtrs_clt_link_ev ev);
+};
+
+struct rtrs_clt_sess *rtrs_clt_open(struct rtrs_clt_ops *ops,
+				 const char *pathname,
+				 const struct rtrs_addr *paths,
+				 size_t path_cnt, u16 port,
+				 size_t pdu_sz, u8 reconnect_delay_sec,
+				 s16 max_reconnect_attempts, u32 nr_poll_queues);
+
+void rtrs_clt_close(struct rtrs_clt_sess *clt);
+
+enum wait_type {
+	RTRS_PERMIT_NOWAIT = 0,
+	RTRS_PERMIT_WAIT   = 1
+};
+
+/**
+ * enum rtrs_clt_con_type() type of ib connection to use with a given
+ * rtrs_permit
+ * @ADMIN_CON - use connection reserved for "service" messages
+ * @IO_CON - use a connection reserved for IO
+ */
+enum rtrs_clt_con_type {
+	RTRS_ADMIN_CON,
+	RTRS_IO_CON
+};
+
+struct rtrs_permit *rtrs_clt_get_permit(struct rtrs_clt_sess *sess,
+					enum rtrs_clt_con_type con_type,
+					enum wait_type wait);
+
+void rtrs_clt_put_permit(struct rtrs_clt_sess *sess,
+			 struct rtrs_permit *permit);
+
+/**
+ * rtrs_clt_req_ops - it holds the request confirmation callback
+ * and a private pointer.
+ * @priv: User supplied private data.
+ * @conf_fn:	callback function to be called as confirmation
+ *	@priv:	User provided data, passed back with corresponding
+ *		@(conf) confirmation.
+ *	@errno: error number.
+ */
+struct rtrs_clt_req_ops {
+	void	*priv;
+	void	(*conf_fn)(void *priv, int errno);
+};
+
+int rtrs_clt_request(int dir, struct rtrs_clt_req_ops *ops,
+		     struct rtrs_clt_sess *sess, struct rtrs_permit *permit,
+		     const struct kvec *vec, size_t nr, size_t len,
+		     struct scatterlist *sg, unsigned int sg_cnt);
+int rtrs_clt_rdma_cq_direct(struct rtrs_clt_sess *clt, unsigned int index);
+
+/**
+ * rtrs_attrs - RTRS session attributes
+ */
+struct rtrs_attrs {
+	u32		queue_depth;
+	u32		max_io_size;
+	u32		max_segments;
+};
+
+int rtrs_clt_query(struct rtrs_clt_sess *sess, struct rtrs_attrs *attr);
+
+/*
+ * Here goes RTRS server API
+ */
+
+/**
+ * enum rtrs_srv_link_ev - Server link events
+ * @RTRS_SRV_LINK_EV_CONNECTED:	Connection from client established
+ * @RTRS_SRV_LINK_EV_DISCONNECTED:	Connection was disconnected, all
+ *					connection RTRS resources were freed.
+ */
+enum rtrs_srv_link_ev {
+	RTRS_SRV_LINK_EV_CONNECTED,
+	RTRS_SRV_LINK_EV_DISCONNECTED,
+};
+
+struct rtrs_srv_ops {
+	/**
+	 * rdma_ev():		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.
+
+	 *	@priv:		Private data set by rtrs_srv_set_sess_priv()
+	 *	@id:		internal RTRS operation id
+	 *	@data:		Pointer to (bidirectional) rdma memory area:
+	 *			- in case of %RTRS_SRV_RDMA_EV_RECV contains
+	 *			data sent by the client
+	 *			- in case of %RTRS_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
+	 */
+	int (*rdma_ev)(void *priv,
+		       struct rtrs_srv_op *id,
+		       void *data, size_t datalen, const void *usr,
+		       size_t usrlen);
+	/**
+	 * link_ev():		Events about connectivity state changes
+	 *			If the callback returns != 0 and the event
+	 *			%RTRS_SRV_LINK_EV_CONNECTED the corresponding
+	 *			session will be destroyed.
+	 *	@sess:		Session
+	 *	@ev:		event
+	 *	@priv:		Private data from user if previously set with
+	 *			rtrs_srv_set_sess_priv()
+	 */
+	int (*link_ev)(struct rtrs_srv_sess *sess, enum rtrs_srv_link_ev ev,
+		       void *priv);
+};
+
+struct rtrs_srv_ctx *rtrs_srv_open(struct rtrs_srv_ops *ops, u16 port);
+
+void rtrs_srv_close(struct rtrs_srv_ctx *ctx);
+
+bool rtrs_srv_resp_rdma(struct rtrs_srv_op *id, int errno);
+
+void rtrs_srv_set_sess_priv(struct rtrs_srv_sess *sess, void *priv);
+
+int rtrs_srv_get_path_name(struct rtrs_srv_sess *sess, char *pathname,
+			   size_t len);
+
+int rtrs_srv_get_queue_depth(struct rtrs_srv_sess *sess);
+
+int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port,
+			  struct rtrs_addr *addr);
+
+int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len);
+int rtrs_addr_to_str(const struct rtrs_addr *addr, char *buf, size_t len);
+#endif