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