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;
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 enum rtrs_mp_policy mp_policy;
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;
127 struct rtrs_clt_path {
129 struct rtrs_clt_sess *clt;
130 wait_queue_head_t state_wq;
131 enum rtrs_clt_state state;
132 atomic_t connected_cnt;
133 struct mutex init_mutex;
134 struct rtrs_clt_io_req *reqs;
135 struct delayed_work reconnect_dwork;
136 struct work_struct close_work;
137 struct work_struct err_recovery_work;
138 unsigned int reconnect_attempts;
140 struct rtrs_rbuf *rbufs;
145 u32 max_pages_per_mr;
149 struct rtrs_clt_stats *stats;
150 /* cache hca_port and hca_name to display in sysfs */
152 char hca_name[IB_DEVICE_NAME_MAX];
153 struct list_head __percpu
157 struct rtrs_clt_sess {
158 struct list_head paths_list; /* rcu protected list */
161 __rcu * __percpu *pcpu_path;
164 struct mutex paths_mutex;
165 struct mutex paths_ev_mutex;
166 char sessname[NAME_MAX];
168 unsigned int max_reconnect_attempts;
169 unsigned int reconnect_delay_sec;
170 unsigned int max_segments;
172 unsigned long *permits_map;
175 wait_queue_head_t permits_wait;
178 void (*link_ev)(void *priv,
179 enum rtrs_clt_link_ev ev);
181 struct kobject *kobj_paths;
182 enum rtrs_mp_policy mp_policy;
185 static inline struct rtrs_clt_con *to_clt_con(struct rtrs_con *c)
187 return container_of(c, struct rtrs_clt_con, c);
190 static inline struct rtrs_clt_path *to_clt_path(struct rtrs_path *s)
192 return container_of(s, struct rtrs_clt_path, s);
195 static inline int permit_size(struct rtrs_clt_sess *clt)
197 return sizeof(struct rtrs_permit) + clt->pdu_sz;
200 static inline struct rtrs_permit *get_permit(struct rtrs_clt_sess *clt,
203 return (struct rtrs_permit *)(clt->permits + permit_size(clt) * idx);
206 int rtrs_clt_reconnect_from_sysfs(struct rtrs_clt_path *path);
207 void rtrs_clt_close_conns(struct rtrs_clt_path *clt_path, bool wait);
208 int rtrs_clt_create_path_from_sysfs(struct rtrs_clt_sess *clt,
209 struct rtrs_addr *addr);
210 int rtrs_clt_remove_path_from_sysfs(struct rtrs_clt_path *path,
211 const struct attribute *sysfs_self);
213 void rtrs_clt_set_max_reconnect_attempts(struct rtrs_clt_sess *clt, int value);
214 int rtrs_clt_get_max_reconnect_attempts(const struct rtrs_clt_sess *clt);
215 void free_path(struct rtrs_clt_path *clt_path);
217 /* rtrs-clt-stats.c */
219 int rtrs_clt_init_stats(struct rtrs_clt_stats *stats);
221 void rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *s);
223 void rtrs_clt_update_wc_stats(struct rtrs_clt_con *con);
224 void rtrs_clt_update_all_stats(struct rtrs_clt_io_req *req, int dir);
226 int rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
228 ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
230 int rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable);
231 int rtrs_clt_stats_migration_from_cnt_to_str(struct rtrs_clt_stats *stats, char *buf);
232 int rtrs_clt_stats_migration_to_cnt_to_str(struct rtrs_clt_stats *stats, char *buf);
233 int rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable);
234 int rtrs_clt_stats_reconnects_to_str(struct rtrs_clt_stats *stats, char *buf);
235 int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable);
236 ssize_t rtrs_clt_stats_rdma_to_str(struct rtrs_clt_stats *stats,
238 int rtrs_clt_reset_all_stats(struct rtrs_clt_stats *stats, bool enable);
239 ssize_t rtrs_clt_reset_all_help(struct rtrs_clt_stats *stats,
242 /* rtrs-clt-sysfs.c */
244 int rtrs_clt_create_sysfs_root_files(struct rtrs_clt_sess *clt);
245 void rtrs_clt_destroy_sysfs_root(struct rtrs_clt_sess *clt);
247 int rtrs_clt_create_path_files(struct rtrs_clt_path *clt_path);
248 void rtrs_clt_destroy_path_files(struct rtrs_clt_path *clt_path,
249 const struct attribute *sysfs_self);
251 #endif /* RTRS_CLT_H */