1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * RPC client multipathing definitions
4 *
5 * Copyright (c) 2015, 2016, Primary Data, Inc. All rights reserved.
6 *
7 * Trond Myklebust <trond.myklebust@primarydata.com>
8 */
9#ifndef _NET_SUNRPC_XPRTMULTIPATH_H
10#define _NET_SUNRPC_XPRTMULTIPATH_H
11
12struct rpc_xprt_iter_ops;
13struct rpc_sysfs_xprt_switch;
14struct rpc_xprt_switch {
15 spinlock_t xps_lock;
16 struct kref xps_kref;
17
18 unsigned int xps_id;
19 unsigned int xps_nxprts;
20 unsigned int xps_nactive;
21 unsigned int xps_nunique_destaddr_xprts;
22 atomic_long_t xps_queuelen;
23 struct list_head xps_xprt_list;
24
25 struct net * xps_net;
26
27 const struct rpc_xprt_iter_ops *xps_iter_ops;
28
29 struct rpc_sysfs_xprt_switch *xps_sysfs;
30 struct rcu_head xps_rcu;
31};
32
33struct rpc_xprt_iter {
34 struct rpc_xprt_switch __rcu *xpi_xpswitch;
35 struct rpc_xprt * xpi_cursor;
36
37 const struct rpc_xprt_iter_ops *xpi_ops;
38};
39
40
41struct rpc_xprt_iter_ops {
42 void (*xpi_rewind)(struct rpc_xprt_iter *);
43 struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
44 struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
45};
46
47extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
48 gfp_t gfp_flags);
49
50extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
51extern void xprt_switch_put(struct rpc_xprt_switch *xps);
52
53extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
54
55extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
56 struct rpc_xprt *xprt);
57extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
58 struct rpc_xprt *xprt, bool offline);
59extern struct rpc_xprt *rpc_xprt_switch_get_main_xprt(struct rpc_xprt_switch *xps);
60
61extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
62 struct rpc_xprt_switch *xps);
63
64extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
65 struct rpc_xprt_switch *xps);
66
67extern void xprt_iter_init_listoffline(struct rpc_xprt_iter *xpi,
68 struct rpc_xprt_switch *xps);
69
70extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
71
72extern void xprt_iter_rewind(struct rpc_xprt_iter *xpi);
73
74extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
75 struct rpc_xprt_iter *xpi,
76 struct rpc_xprt_switch *newswitch);
77
78extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
79extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
80
81extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
82 const struct sockaddr *sap);
83
84extern void xprt_multipath_cleanup_ids(void);
85
86#endif
87