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
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