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 */