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.
13 #include <linux/device.h>
17 * enum rtrs_clt_state - Client states.
21 RTRS_CLT_CONNECTING_ERR,
22 RTRS_CLT_RECONNECTING,
31 MP_POLICY_MIN_INFLIGHT,
34 /* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
35 struct rtrs_clt_stats_reconnects {
40 /* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
41 struct rtrs_clt_stats_cpu_migr {
46 /* stats for Read and write operation.
47 * see Documentation/ABI/testing/sysfs-class-rtrs-client for details
49 struct rtrs_clt_stats_rdma {
58 struct rtrs_clt_stats_pcpu {
59 struct rtrs_clt_stats_cpu_migr cpu_migr;
60 struct rtrs_clt_stats_rdma rdma;
63 struct rtrs_clt_stats {
64 struct kobject kobj_stats;
65 struct rtrs_clt_stats_pcpu __percpu *pcpu_stats;
66 struct rtrs_clt_stats_reconnects reconnects;
72 struct rtrs_iu *rsp_ius;
75 struct mutex con_mutex;
81 * rtrs_permit - permits the memory allocation for future RDMA operation.
82 * Combine with irq pinning to keep IO on same CPU.
85 enum rtrs_clt_con_type con_type;
92 * rtrs_clt_io_req - describes one inflight IO request
94 struct rtrs_clt_io_req {
95 struct list_head list;
97 struct scatterlist *sglist; /* list holding user data */
100 unsigned int data_len;
101 unsigned int usr_len;
104 struct rtrs_clt_con *con;
105 struct rtrs_sg_desc *desc;
107 struct rtrs_permit *permit;
108 enum dma_data_direction dir;
109 void (*conf)(void *priv, int errno);
110 unsigned long start_jiffies;
113 struct ib_cqe inv_cqe;
114 struct completion inv_comp;
125 struct rtrs_clt_sess {
127 struct rtrs_clt *clt;
128 wait_queue_head_t state_wq;
129 enum rtrs_clt_state state;
130 atomic_t connected_cnt;
131 struct mutex init_mutex;
132 struct rtrs_clt_io_req *reqs;
133 struct delayed_work reconnect_dwork;
134 struct work_struct close_work;
135 unsigned int reconnect_attempts;
137 struct rtrs_rbuf *rbufs;
142 u32 max_pages_per_mr;
147 struct rtrs_clt_stats *stats;
148 /* cache hca_port and hca_name to display in sysfs */
150 char hca_name[IB_DEVICE_NAME_MAX];
151 struct list_head __percpu
156 struct list_head paths_list; /* rcu protected list */
159 __rcu * __percpu *pcpu_path;
162 struct mutex paths_mutex;
163 struct mutex paths_ev_mutex;
164 char sessname[NAME_MAX];
166 unsigned int max_reconnect_attempts;
167 unsigned int reconnect_delay_sec;
168 unsigned int max_segments;
170 unsigned long *permits_map;
173 wait_queue_head_t permits_wait;
176 void (*link_ev)(void *priv,
177 enum rtrs_clt_link_ev ev);
179 struct kobject *kobj_paths;
180 enum rtrs_mp_policy mp_policy;
183 static inline struct rtrs_clt_con *to_clt_con(struct rtrs_con *c)
185 return container_of(c, struct rtrs_clt_con, c);
188 static inline struct rtrs_clt_sess *to_clt_sess(struct rtrs_sess *s)
190 return container_of(s, struct rtrs_clt_sess, s);
193 static inline int permit_size(struct rtrs_clt *clt)
195 return sizeof(struct rtrs_permit) + clt->pdu_sz;
198 static inline struct rtrs_permit *get_permit(struct rtrs_clt *clt, int idx)
200 return (struct rtrs_permit *)(clt->permits + permit_size(clt) * idx);
203 int rtrs_clt_reconnect_from_sysfs(struct rtrs_clt_sess *sess);
204 int rtrs_clt_disconnect_from_sysfs(struct rtrs_clt_sess *sess);
205 int rtrs_clt_create_path_from_sysfs(struct rtrs_clt *clt,
206 struct rtrs_addr *addr);
207 int rtrs_clt_remove_path_from_sysfs(struct rtrs_clt_sess *sess,
208 const struct attribute *sysfs_self);
210 void rtrs_clt_set_max_reconnect_attempts(struct rtrs_clt *clt, int value);
211 int rtrs_clt_get_max_reconnect_attempts(const struct rtrs_clt *clt);
212 void free_sess(struct rtrs_clt_sess *sess);
214 /* rtrs-clt-stats.c */
216 int rtrs_clt_init_stats(struct rtrs_clt_stats *stats);
218 void rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *s);
220 void rtrs_clt_update_wc_stats(struct rtrs_clt_con *con);
221 void rtrs_clt_update_all_stats(struct rtrs_clt_io_req *req, int dir);
223 int rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
225 ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
226 char *page, size_t len);
227 int rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable);
228 int rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats, char *buf,
230 int rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable);
231 int rtrs_clt_stats_reconnects_to_str(struct rtrs_clt_stats *stats, char *buf,
233 int rtrs_clt_reset_wc_comp_stats(struct rtrs_clt_stats *stats, bool enable);
234 int rtrs_clt_stats_wc_completion_to_str(struct rtrs_clt_stats *stats, char *buf,
236 int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable);
237 ssize_t rtrs_clt_stats_rdma_to_str(struct rtrs_clt_stats *stats,
238 char *page, size_t len);
239 int rtrs_clt_reset_all_stats(struct rtrs_clt_stats *stats, bool enable);
240 ssize_t rtrs_clt_reset_all_help(struct rtrs_clt_stats *stats,
241 char *page, size_t len);
243 /* rtrs-clt-sysfs.c */
245 int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt);
246 void rtrs_clt_destroy_sysfs_root(struct rtrs_clt *clt);
248 int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess);
249 void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
250 const struct attribute *sysfs_self);
252 #endif /* RTRS_CLT_H */