2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #ifndef OPENAFS_RX_PEER_H
11 #define OPENAFS_RX_PEER_H
13 /* A peer refers to a peer process, specified by a (host,port) pair. There may
14 * be more than one peer on a given host. */
17 struct rx_peer_rx_lock {
18 struct rx_peer_rx_lock *next; /* Next in hash conflict or free list */
21 struct rx_peer *next; /* Next in hash conflict or free list */
23 #ifdef RX_ENABLE_LOCKS
24 afs_kmutex_t peer_lock; /* Lock peer */
25 #endif /* RX_ENABLE_LOCKS */
26 afs_uint32 host; /* Remote IP address, in net byte order */
27 u_short port; /* Remote UDP port, in net byte order */
29 /* interface mtu probably used for this host - includes RX Header */
30 u_short ifMTU; /* doesn't include IP header */
32 /* For garbage collection */
33 afs_uint32 idleWhen; /* When the refcountwent to zero */
34 afs_int32 refCount; /* Reference count for this structure (rx_peerHashTable_lock) */
36 /* Congestion control parameters */
37 u_char burstSize; /* Reinitialization size for the burst parameter */
38 u_char burst; /* Number of packets that can be transmitted right now, without pausing */
39 struct clock burstWait; /* Delay until new burst is allowed */
40 struct rx_queue congestionQueue; /* Calls that are waiting for non-zero burst value */
41 int rtt; /* Smoothed round trip time, measured in milliseconds/8 */
42 int rtt_dev; /* Smoothed rtt mean difference, in milliseconds/4 */
43 int nSent; /* Total number of distinct data packets sent, not including retransmissions */
44 int reSends; /* Total number of retransmissions for this peer, since this structure was created */
46 /* the "natural" MTU, excluding IP,UDP headers, is negotiated by the endpoints */
49 /* negotiated maximum number of packets to send in a single datagram. */
50 u_short maxDgramPackets;
51 /* local maximum number of packets to send in a single datagram. */
52 u_short ifDgramPackets;
54 * MTU, cwind, and nDgramPackets are used to initialize
55 * slow start parameters for new calls. These values are set whenever a
56 * call sends a retransmission and at the end of each call.
57 * congestSeq is incremented each time the congestion parameters are
58 * changed by a call recovering from a dropped packet. A call used
59 * MAX when updating congestion parameters if it started with the
60 * current congestion sequence number, otherwise it uses MIN.
62 u_short MTU; /* MTU for AFS 3.4a jumboGrams */
63 u_short cwind; /* congestion window */
64 u_short nDgramPackets; /* number packets per AFS 3.5 jumbogram */
65 u_short congestSeq; /* Changed when a call retransmits */
66 afs_hyper_t bytesSent; /* Number of bytes sent to this peer */
67 afs_hyper_t bytesReceived; /* Number of bytes received from this peer */
68 struct rx_queue rpcStats; /* rpc statistic list */
69 int lastReachTime; /* Last time we verified reachability */
70 afs_int32 maxPacketSize; /* peer packetsize hint */