1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * RDMA Transport Layer
4 *
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.
8 */
9
10 #ifndef RTRS_SRV_H
11 #define RTRS_SRV_H
12
13 #include <linux/device.h>
14 #include <linux/refcount.h>
15 #include <linux/percpu.h>
16 #include "rtrs-pri.h"
17
18 /*
19 * enum rtrs_srv_state - Server states.
20 */
21 enum rtrs_srv_state {
22 RTRS_SRV_CONNECTING,
23 RTRS_SRV_CONNECTED,
24 RTRS_SRV_CLOSING,
25 RTRS_SRV_CLOSED,
26 };
27
28 /* stats for Read and write operation.
29 * see Documentation/ABI/testing/sysfs-class-rtrs-server for details
30 */
31 struct rtrs_srv_stats_rdma_stats {
32 struct {
33 u64 cnt;
34 u64 size_total;
35 } dir[2];
36 };
37
38 struct rtrs_srv_stats {
39 struct kobject kobj_stats;
40 struct rtrs_srv_stats_rdma_stats __percpu *rdma_stats;
41 struct rtrs_srv_path *srv_path;
42 };
43
44 struct rtrs_srv_con {
45 struct rtrs_con c;
46 struct list_head rsp_wr_wait_list;
47 spinlock_t rsp_wr_wait_lock;
48 };
49
50 /* IO context in rtrs_srv, each io has one */
51 struct rtrs_srv_op {
52 struct rtrs_srv_con *con;
53 u32 msg_id;
54 u8 dir;
55 struct rtrs_msg_rdma_read *rd_msg;
56 struct ib_rdma_wr tx_wr;
57 struct ib_sge tx_sg;
58 struct list_head wait_list;
59 int status;
60 };
61
62 /*
63 * server side memory region context, when always_invalidate=Y, we need
64 * queue_depth of memory region to invalidate each memory region.
65 */
66 struct rtrs_srv_mr {
67 struct ib_mr *mr;
68 struct sg_table sgt;
69 struct ib_cqe inv_cqe; /* only for always_invalidate=true */
70 u32 msg_id; /* only for always_invalidate=true */
71 u32 msg_off; /* only for always_invalidate=true */
72 struct rtrs_iu *iu; /* send buffer for new rkey msg */
73 };
74
75 struct rtrs_srv_path {
76 struct rtrs_path s;
77 struct rtrs_srv_sess *srv;
78 struct work_struct close_work;
79 enum rtrs_srv_state state;
80 spinlock_t state_lock;
81 int cur_cq_vector;
82 struct rtrs_srv_op **ops_ids;
83 struct percpu_ref ids_inflight_ref;
84 struct completion complete_done;
85 struct rtrs_srv_mr *mrs;
86 unsigned int mrs_num;
87 dma_addr_t *dma_addr;
88 bool established;
89 unsigned int mem_bits;
90 struct kobject kobj;
91 struct rtrs_srv_stats *stats;
92 };
93
to_srv_path(struct rtrs_path * s)94 static inline struct rtrs_srv_path *to_srv_path(struct rtrs_path *s)
95 {
96 return container_of(s, struct rtrs_srv_path, s);
97 }
98
99 struct rtrs_srv_sess {
100 struct list_head paths_list;
101 int paths_up;
102 struct mutex paths_ev_mutex;
103 size_t paths_num;
104 struct mutex paths_mutex;
105 uuid_t paths_uuid;
106 refcount_t refcount;
107 struct rtrs_srv_ctx *ctx;
108 struct list_head ctx_list;
109 void *priv;
110 size_t queue_depth;
111 struct page **chunks;
112 struct device dev;
113 unsigned int dev_ref;
114 struct kobject *kobj_paths;
115 };
116
117 struct rtrs_srv_ctx {
118 struct rtrs_srv_ops ops;
119 struct rdma_cm_id *cm_id_ip;
120 struct rdma_cm_id *cm_id_ib;
121 struct mutex srv_mutex;
122 struct list_head srv_list;
123 };
124
125 struct rtrs_srv_ib_ctx {
126 struct rtrs_srv_ctx *srv_ctx;
127 u16 port;
128 struct mutex ib_dev_mutex;
129 int ib_dev_count;
130 };
131
132 extern const struct class rtrs_dev_class;
133
134 void close_path(struct rtrs_srv_path *srv_path);
135
rtrs_srv_update_rdma_stats(struct rtrs_srv_stats * s,size_t size,int d)136 static inline void rtrs_srv_update_rdma_stats(struct rtrs_srv_stats *s,
137 size_t size, int d)
138 {
139 this_cpu_inc(s->rdma_stats->dir[d].cnt);
140 this_cpu_add(s->rdma_stats->dir[d].size_total, size);
141 }
142
143 /* functions which are implemented in rtrs-srv-stats.c */
144 int rtrs_srv_reset_rdma_stats(struct rtrs_srv_stats *stats, bool enable);
145 ssize_t rtrs_srv_stats_rdma_to_str(struct rtrs_srv_stats *stats, char *page);
146 int rtrs_srv_reset_all_stats(struct rtrs_srv_stats *stats, bool enable);
147 ssize_t rtrs_srv_reset_all_help(struct rtrs_srv_stats *stats,
148 char *page, size_t len);
149
150 /* functions which are implemented in rtrs-srv-sysfs.c */
151 int rtrs_srv_create_path_files(struct rtrs_srv_path *srv_path);
152 void rtrs_srv_destroy_path_files(struct rtrs_srv_path *srv_path);
153
154 #endif /* RTRS_SRV_H */
155