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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_xprt_switch {
14 spinlock_t xps_lock;
15 struct kref xps_kref;
16
17 unsigned int xps_nxprts;
18 struct list_head xps_xprt_list;
19
20 struct net * xps_net;
21
22 const struct rpc_xprt_iter_ops *xps_iter_ops;
23
24 struct rcu_head xps_rcu;
25};
26
27struct rpc_xprt_iter {
28 struct rpc_xprt_switch __rcu *xpi_xpswitch;
29 struct rpc_xprt * xpi_cursor;
30
31 const struct rpc_xprt_iter_ops *xpi_ops;
32};
33
34
35struct rpc_xprt_iter_ops {
36 void (*xpi_rewind)(struct rpc_xprt_iter *);
37 struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
38 struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
39};
40
41extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
42 gfp_t gfp_flags);
43
44extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
45extern void xprt_switch_put(struct rpc_xprt_switch *xps);
46
47extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
48
49extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
50 struct rpc_xprt *xprt);
51extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
52 struct rpc_xprt *xprt);
53
54extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
55 struct rpc_xprt_switch *xps);
56
57extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
58 struct rpc_xprt_switch *xps);
59
60extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
61
62extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
63 struct rpc_xprt_iter *xpi,
64 struct rpc_xprt_switch *newswitch);
65
66extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
67extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
68extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
69
70extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
71 const struct sockaddr *sap);
72#endif