diff options
Diffstat (limited to 'include/rxrpc/peer.h')
| -rw-r--r-- | include/rxrpc/peer.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/include/rxrpc/peer.h b/include/rxrpc/peer.h new file mode 100644 index 000000000000..8b8fe97cbbcc --- /dev/null +++ b/include/rxrpc/peer.h @@ -0,0 +1,82 @@ +/* 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 */ |