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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 |
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