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,
32 MP_POLICY_MIN_LATENCY,
35 /* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
36 struct rtrs_clt_stats_reconnects {
41 /* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
42 struct rtrs_clt_stats_cpu_migr {
47 /* stats for Read and write operation.
48 * see Documentation/ABI/testing/sysfs-class-rtrs-client for details
50 struct rtrs_clt_stats_rdma {
59 struct rtrs_clt_stats_pcpu {
60 struct rtrs_clt_stats_cpu_migr cpu_migr;
61 struct rtrs_clt_stats_rdma rdma;
64 struct rtrs_clt_stats {
65 struct kobject kobj_stats;
66 struct rtrs_clt_stats_pcpu __percpu *pcpu_stats;
67 struct rtrs_clt_stats_reconnects reconnects;
73 struct rtrs_iu *rsp_ius;
76 struct mutex con_mutex;
82 * rtrs_permit - permits the memory allocation for future RDMA operation.
83 * Combine with irq pinning to keep IO on same CPU.
86 enum rtrs_clt_con_type con_type;
93 * rtrs_clt_io_req - describes one inflight IO request
95 struct rtrs_clt_io_req {
96 struct list_head list;
98 struct scatterlist *sglist; /* list holding user data */
100 unsigned int sg_size;
101 unsigned int data_len;
102 unsigned int usr_len;
105 struct rtrs_clt_con *con;
106 struct rtrs_sg_desc *desc;
108 struct rtrs_permit *permit;
109 enum dma_data_direction dir;
110 void (*conf)(void *priv, int errno);
111 unsigned long start_jiffies;
114 struct ib_cqe inv_cqe;
115 struct completion inv_comp;
126 struct rtrs_clt_sess {
128 struct rtrs_clt *clt;
129 wait_queue_head_t state_wq;
130 enum rtrs_clt_state state;
131 atomic_t connected_cnt;
132 struct mutex init_mutex;
133 struct rtrs_clt_io_req *reqs;
134 struct delayed_work reconnect_dwork;
135 struct work_struct close_work;
136 unsigned int reconnect_attempts;
138 struct rtrs_rbuf *rbufs;
143 u32 max_pages_per_mr;
148 struct rtrs_clt_stats *stats;
149 /* cache hca_port and hca_name to display in sysfs */
151 char hca_name[IB_DEVICE_NAME_MAX];
152 struct list_head __percpu
157 struct list_head paths_list; /* rcu protected list */
160 __rcu * __percpu *pcpu_path;
163 struct mutex paths_mutex;
164 struct mutex paths_ev_mutex;
165 char sessname[NAME_MAX];
167 unsigned int max_reconnect_attempts;
168 unsigned int reconnect_delay_sec;
169 unsigned int max_segments;
171 unsigned long *permits_map;
174 wait_queue_head_t permits_wait;
177 void (*link_ev)(void *priv,
178 enum rtrs_clt_link_ev ev);
180 struct kobject *kobj_paths;
181 enum rtrs_mp_policy mp_policy;
184 static inline struct rtrs_clt_con *to_clt_con(struct rtrs_con *c)
186 return container_of(c, struct rtrs_clt_con, c);
189 static inline struct rtrs_clt_sess *to_clt_sess(struct rtrs_sess *s)
191 return container_of(s, struct rtrs_clt_sess, s);
194 static inline int permit_size(struct rtrs_clt *clt)
196 return sizeof(struct rtrs_permit) + clt->pdu_sz;
199 static inline struct rtrs_permit *get_permit(struct rtrs_clt *clt, int idx)
201 return (struct rtrs_permit *)(clt->permits + permit_size(clt) * idx);
204 int rtrs_clt_reconnect_from_sysfs(struct rtrs_clt_sess *sess);
205 int rtrs_clt_disconnect_from_sysfs(struct rtrs_clt_sess *sess);
206 int rtrs_clt_create_path_from_sysfs(struct rtrs_clt *clt,
207 struct rtrs_addr *addr);
208 int rtrs_clt_remove_path_from_sysfs(struct rtrs_clt_sess *sess,
209 const struct attribute *sysfs_self);
211 void rtrs_clt_set_max_reconnect_attempts(struct rtrs_clt *clt, int value);
212 int rtrs_clt_get_max_reconnect_attempts(const struct rtrs_clt *clt);
213 void free_sess(struct rtrs_clt_sess *sess);
215 /* rtrs-clt-stats.c */
217 int rtrs_clt_init_stats(struct rtrs_clt_stats *stats);
219 void rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *s);
221 void rtrs_clt_update_wc_stats(struct rtrs_clt_con *con);
222 void rtrs_clt_update_all_stats(struct rtrs_clt_io_req *req, int dir);
224 int rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
226 ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
227 char *page, size_t len);
228 int rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable);
229 int rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats, char *buf,
231 int rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable);
232 int rtrs_clt_stats_reconnects_to_str(struct rtrs_clt_stats *stats, char *buf,
234 int rtrs_clt_reset_wc_comp_stats(struct rtrs_clt_stats *stats, bool enable);
235 int rtrs_clt_stats_wc_completion_to_str(struct rtrs_clt_stats *stats, char *buf,
237 int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable);
238 ssize_t rtrs_clt_stats_rdma_to_str(struct rtrs_clt_stats *stats,
239 char *page, size_t len);
240 int rtrs_clt_reset_all_stats(struct rtrs_clt_stats *stats, bool enable);
241 ssize_t rtrs_clt_reset_all_help(struct rtrs_clt_stats *stats,
242 char *page, size_t len);
244 /* rtrs-clt-sysfs.c */
246 int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt);
247 void rtrs_clt_destroy_sysfs_root(struct rtrs_clt *clt);
249 int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess);
250 void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
251 const struct attribute *sysfs_self);
253 #endif /* RTRS_CLT_H */