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1 #ifndef _LINUX_TFRC_H_
2 #define _LINUX_TFRC_H_
3 /*
4  *  TFRC - Data Structures for the TCP-Friendly Rate Control congestion
5  *         control mechanism as specified in RFC 3448.
6  *
7  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
8  *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
9  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
10  *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or
15  *  (at your option) any later version.
16  */
17 #include <linux/types.h>
18 
19 /** 	tfrc_rx_info    -    TFRC Receiver Data Structure
20  *
21  * 	@tfrcrx_x_recv:	receiver estimate of sending rate (3.2.2)
22  * 	@tfrcrx_rtt:	round-trip-time (communicated by sender)
23  * 	@tfrcrx_p:	current estimate of loss event rate (3.2.2)
24  */
25 struct tfrc_rx_info {
26   	__u32 tfrcrx_x_recv;
27 	__u32 tfrcrx_rtt;
28   	__u32 tfrcrx_p;
29 };
30 
31 /** 	tfrc_tx_info    -    TFRC Sender Data Structure
32  *
33  * 	@tfrctx_x:	computed transmit rate (4.3 (4))
34  * 	@tfrctx_x_recv: receiver estimate of send rate (4.3)
35  * 	@tfrctx_x_calc:	return value of throughput equation (3.1)
36  * 	@tfrctx_rtt:	(moving average) estimate of RTT (4.3)
37  * 	@tfrctx_p:	current loss event rate (5.4)
38  * 	@tfrctx_rto:	estimate of RTO, equals 4*RTT (4.3)
39  * 	@tfrctx_ipi:	inter-packet interval (4.6)
40  *
41  *  Note: X and X_recv are both maintained in units of 64 * bytes/second. This
42  *        enables a finer resolution of sending rates and avoids problems with
43  *        integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
44  */
45 struct tfrc_tx_info {
46 	__u64 tfrctx_x;
47 	__u64 tfrctx_x_recv;
48 	__u32 tfrctx_x_calc;
49 	__u32 tfrctx_rtt;
50 	__u32 tfrctx_p;
51 	__u32 tfrctx_rto;
52 	__u32 tfrctx_ipi;
53 };
54 
55 #endif /* _LINUX_TFRC_H_ */
56