1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
12 #include <linux/socket.h>
13 #include <linux/scatterlist.h>
22 * RDMA transport (RTRS) client API
26 * enum rtrs_clt_link_ev - Events about connectivity state of a client
27 * @RTRS_CLT_LINK_EV_RECONNECTED Client was reconnected.
28 * @RTRS_CLT_LINK_EV_DISCONNECTED Client was disconnected.
30 enum rtrs_clt_link_ev {
31 RTRS_CLT_LINK_EV_RECONNECTED,
32 RTRS_CLT_LINK_EV_DISCONNECTED,
36 * Source and destination address of a path to be established
39 struct sockaddr_storage *src;
40 struct sockaddr_storage *dst;
44 * rtrs_clt_ops - it holds the link event callback and private pointer.
45 * @priv: User supplied private data.
46 * @link_ev: Event notification callback function for connection state changes
47 * @priv: User supplied data that was passed to rtrs_clt_open()
52 void (*link_ev)(void *priv, enum rtrs_clt_link_ev ev);
55 struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops,
57 const struct rtrs_addr *paths,
58 size_t path_cnt, u16 port,
59 size_t pdu_sz, u8 reconnect_delay_sec,
61 size_t max_segment_size,
62 s16 max_reconnect_attempts);
64 void rtrs_clt_close(struct rtrs_clt *sess);
67 * rtrs_permit_to_pdu() - converts rtrs_permit to opaque pdu pointer
68 * @permit: RTRS permit pointer, it associates the memory allocation for future
71 void *rtrs_permit_to_pdu(struct rtrs_permit *permit);
74 RTRS_PERMIT_NOWAIT = 0,
79 * enum rtrs_clt_con_type() type of ib connection to use with a given
81 * @ADMIN_CON - use connection reserved for "service" messages
82 * @IO_CON - use a connection reserved for IO
84 enum rtrs_clt_con_type {
89 struct rtrs_permit *rtrs_clt_get_permit(struct rtrs_clt *sess,
90 enum rtrs_clt_con_type con_type,
93 void rtrs_clt_put_permit(struct rtrs_clt *sess, struct rtrs_permit *permit);
96 * rtrs_clt_req_ops - it holds the request confirmation callback
97 * and a private pointer.
98 * @priv: User supplied private data.
99 * @conf_fn: callback function to be called as confirmation
100 * @priv: User provided data, passed back with corresponding
101 * @(conf) confirmation.
102 * @errno: error number.
104 struct rtrs_clt_req_ops {
106 void (*conf_fn)(void *priv, int errno);
109 int rtrs_clt_request(int dir, struct rtrs_clt_req_ops *ops,
110 struct rtrs_clt *sess, struct rtrs_permit *permit,
111 const struct kvec *vec, size_t nr, size_t len,
112 struct scatterlist *sg, unsigned int sg_cnt);
115 * rtrs_attrs - RTRS session attributes
120 u8 sessname[NAME_MAX];
121 struct kobject *sess_kobj;
124 int rtrs_clt_query(struct rtrs_clt *sess, struct rtrs_attrs *attr);
127 * Here goes RTRS server API
131 * enum rtrs_srv_link_ev - Server link events
132 * @RTRS_SRV_LINK_EV_CONNECTED: Connection from client established
133 * @RTRS_SRV_LINK_EV_DISCONNECTED: Connection was disconnected, all
134 * connection RTRS resources were freed.
136 enum rtrs_srv_link_ev {
137 RTRS_SRV_LINK_EV_CONNECTED,
138 RTRS_SRV_LINK_EV_DISCONNECTED,
141 struct rtrs_srv_ops {
143 * rdma_ev(): Event notification for RDMA operations
144 * If the callback returns a value != 0, an error
145 * message for the data transfer will be sent to
149 * @priv: Private data set by rtrs_srv_set_sess_priv()
150 * @id: internal RTRS operation id
152 * @data: Pointer to (bidirectional) rdma memory area:
153 * - in case of %RTRS_SRV_RDMA_EV_RECV contains
154 * data sent by the client
155 * - in case of %RTRS_SRV_RDMA_EV_WRITE_REQ points
156 * to the memory area where the response is to be
158 * @datalen: Size of the memory area in @data
159 * @usr: The extra user message sent by the client (%vec)
160 * @usrlen: Size of the user message
162 int (*rdma_ev)(struct rtrs_srv *sess, void *priv,
163 struct rtrs_srv_op *id, int dir,
164 void *data, size_t datalen, const void *usr,
167 * link_ev(): Events about connectivity state changes
168 * If the callback returns != 0 and the event
169 * %RTRS_SRV_LINK_EV_CONNECTED the corresponding
170 * session will be destroyed.
173 * @priv: Private data from user if previously set with
174 * rtrs_srv_set_sess_priv()
176 int (*link_ev)(struct rtrs_srv *sess, enum rtrs_srv_link_ev ev,
180 struct rtrs_srv_ctx *rtrs_srv_open(struct rtrs_srv_ops *ops, u16 port);
182 void rtrs_srv_close(struct rtrs_srv_ctx *ctx);
184 bool rtrs_srv_resp_rdma(struct rtrs_srv_op *id, int errno);
186 void rtrs_srv_set_sess_priv(struct rtrs_srv *sess, void *priv);
188 int rtrs_srv_get_sess_name(struct rtrs_srv *sess, char *sessname, size_t len);
190 int rtrs_srv_get_queue_depth(struct rtrs_srv *sess);
192 int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port,
193 struct rtrs_addr *addr);
195 int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len);