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1/* peer.h: Rx RPC per-transport peer record
2 *
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _LINUX_RXRPC_PEER_H
13#define _LINUX_RXRPC_PEER_H
14
15#include <linux/wait.h>
16#include <rxrpc/types.h>
17#include <rxrpc/krxtimod.h>
18
19struct rxrpc_peer_ops
20{
21 /* peer record being added */
22 int (*adding)(struct rxrpc_peer *peer);
23
24 /* peer record being discarded from graveyard */
25 void (*discarding)(struct rxrpc_peer *peer);
26
27 /* change of epoch detected on connection */
28 void (*change_of_epoch)(struct rxrpc_connection *conn);
29};
30
31/*****************************************************************************/
32/*
33 * Rx RPC per-transport peer record
34 * - peers only retain a refcount on the transport when they are active
35 * - peers with refcount==0 are inactive and reside in the transport's graveyard
36 */
37struct rxrpc_peer
38{
39 atomic_t usage;
40 struct rxrpc_peer_ops *ops; /* operations on this peer */
41 struct rxrpc_transport *trans; /* owner transport */
42 struct rxrpc_timer timeout; /* timeout for grave destruction */
43 struct list_head link; /* link in transport's peer list */
44 struct list_head proc_link; /* link in /proc list */
45 rwlock_t conn_idlock; /* lock for connection IDs */
46 struct list_head conn_idlist; /* list of connections granted IDs */
47 uint32_t conn_idcounter; /* connection ID counter */
48 rwlock_t conn_lock; /* lock for active/dead connections */
49 struct list_head conn_active; /* active connections to/from this peer */
50 struct list_head conn_graveyard; /* graveyard for inactive connections */
51 spinlock_t conn_gylock; /* lock for conn_graveyard */
52 wait_queue_head_t conn_gy_waitq; /* wait queue hit when graveyard is empty */
53 atomic_t conn_count; /* number of attached connections */
54 struct in_addr addr; /* remote address */
55 size_t if_mtu; /* interface MTU for this peer */
56 spinlock_t lock; /* access lock */
57
58 void *user; /* application layer data */
59
60 /* calculated RTT cache */
61#define RXRPC_RTT_CACHE_SIZE 32
62 suseconds_t rtt; /* current RTT estimate (in uS) */
63 unsigned rtt_point; /* next entry at which to insert */
64 unsigned rtt_usage; /* amount of cache actually used */
65 suseconds_t rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
66};
67
68
69extern int rxrpc_peer_lookup(struct rxrpc_transport *trans,
70 __be32 addr,
71 struct rxrpc_peer **_peer);
72
73static inline void rxrpc_get_peer(struct rxrpc_peer *peer)
74{
75 BUG_ON(atomic_read(&peer->usage)<0);
76 atomic_inc(&peer->usage);
77 //printk("rxrpc_get_peer(%p{u=%d})\n",peer,atomic_read(&peer->usage));
78}
79
80extern void rxrpc_put_peer(struct rxrpc_peer *peer);
81
82#endif /* _LINUX_RXRPC_PEER_H */