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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 atomic_long_t xps_queuelen;
22 struct list_head xps_xprt_list;
23
24 struct net * xps_net;
25
26 const struct rpc_xprt_iter_ops *xps_iter_ops;
27
28 struct rpc_sysfs_xprt_switch *xps_sysfs;
29 struct rcu_head xps_rcu;
30};
31
32struct rpc_xprt_iter {
33 struct rpc_xprt_switch __rcu *xpi_xpswitch;
34 struct rpc_xprt * xpi_cursor;
35
36 const struct rpc_xprt_iter_ops *xpi_ops;
37};
38
39
40struct rpc_xprt_iter_ops {
41 void (*xpi_rewind)(struct rpc_xprt_iter *);
42 struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
43 struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
44};
45
46extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
47 gfp_t gfp_flags);
48
49extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
50extern void xprt_switch_put(struct rpc_xprt_switch *xps);
51
52extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
53
54extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
55 struct rpc_xprt *xprt);
56extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
57 struct rpc_xprt *xprt);
58
59extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
60 struct rpc_xprt_switch *xps);
61
62extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
63 struct rpc_xprt_switch *xps);
64
65extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
66
67extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
68 struct rpc_xprt_iter *xpi,
69 struct rpc_xprt_switch *newswitch);
70
71extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
72extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
73extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
74
75extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
76 const struct sockaddr *sap);
77
78extern void xprt_multipath_cleanup_ids(void);
79
80#endif