forked from Minki/linux
83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
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/* peer.h: Rx RPC per-transport peer record
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_RXRPC_PEER_H
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#define _LINUX_RXRPC_PEER_H
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#include <linux/wait.h>
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#include <rxrpc/types.h>
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#include <rxrpc/krxtimod.h>
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struct rxrpc_peer_ops
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{
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/* peer record being added */
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int (*adding)(struct rxrpc_peer *peer);
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/* peer record being discarded from graveyard */
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void (*discarding)(struct rxrpc_peer *peer);
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/* change of epoch detected on connection */
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void (*change_of_epoch)(struct rxrpc_connection *conn);
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};
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/*****************************************************************************/
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/*
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* Rx RPC per-transport peer record
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* - peers only retain a refcount on the transport when they are active
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* - peers with refcount==0 are inactive and reside in the transport's graveyard
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*/
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struct rxrpc_peer
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{
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atomic_t usage;
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struct rxrpc_peer_ops *ops; /* operations on this peer */
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struct rxrpc_transport *trans; /* owner transport */
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struct rxrpc_timer timeout; /* timeout for grave destruction */
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struct list_head link; /* link in transport's peer list */
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struct list_head proc_link; /* link in /proc list */
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rwlock_t conn_idlock; /* lock for connection IDs */
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struct list_head conn_idlist; /* list of connections granted IDs */
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uint32_t conn_idcounter; /* connection ID counter */
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rwlock_t conn_lock; /* lock for active/dead connections */
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struct list_head conn_active; /* active connections to/from this peer */
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struct list_head conn_graveyard; /* graveyard for inactive connections */
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spinlock_t conn_gylock; /* lock for conn_graveyard */
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wait_queue_head_t conn_gy_waitq; /* wait queue hit when graveyard is empty */
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atomic_t conn_count; /* number of attached connections */
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struct in_addr addr; /* remote address */
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size_t if_mtu; /* interface MTU for this peer */
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spinlock_t lock; /* access lock */
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void *user; /* application layer data */
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/* calculated RTT cache */
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#define RXRPC_RTT_CACHE_SIZE 32
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suseconds_t rtt; /* current RTT estimate (in uS) */
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unsigned rtt_point; /* next entry at which to insert */
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unsigned rtt_usage; /* amount of cache actually used */
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suseconds_t rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
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};
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extern int rxrpc_peer_lookup(struct rxrpc_transport *trans,
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__be32 addr,
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struct rxrpc_peer **_peer);
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static inline void rxrpc_get_peer(struct rxrpc_peer *peer)
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{
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BUG_ON(atomic_read(&peer->usage)<0);
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atomic_inc(&peer->usage);
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//printk("rxrpc_get_peer(%p{u=%d})\n",peer,atomic_read(&peer->usage));
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}
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extern void rxrpc_put_peer(struct rxrpc_peer *peer);
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#endif /* _LINUX_RXRPC_PEER_H */
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