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