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 */