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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
65299d6c ACM |
2 | #ifndef _LINUX_TFRC_H_ |
3 | #define _LINUX_TFRC_H_ | |
4 | /* | |
d61c167d GR |
5 | * TFRC - Data Structures for the TCP-Friendly Rate Control congestion |
6 | * control mechanism as specified in RFC 3448. | |
65299d6c ACM |
7 | * |
8 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |
9 | * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> | |
10 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
11 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
65299d6c | 12 | */ |
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13 | #include <linux/types.h> |
14 | ||
d61c167d GR |
15 | /** tfrc_rx_info - TFRC Receiver Data Structure |
16 | * | |
17 | * @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2) | |
18 | * @tfrcrx_rtt: round-trip-time (communicated by sender) | |
19 | * @tfrcrx_p: current estimate of loss event rate (3.2.2) | |
20 | */ | |
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21 | struct tfrc_rx_info { |
22 | __u32 tfrcrx_x_recv; | |
23 | __u32 tfrcrx_rtt; | |
24 | __u32 tfrcrx_p; | |
25 | }; | |
26 | ||
d61c167d GR |
27 | /** tfrc_tx_info - TFRC Sender Data Structure |
28 | * | |
29 | * @tfrctx_x: computed transmit rate (4.3 (4)) | |
30 | * @tfrctx_x_recv: receiver estimate of send rate (4.3) | |
31 | * @tfrctx_x_calc: return value of throughput equation (3.1) | |
32 | * @tfrctx_rtt: (moving average) estimate of RTT (4.3) | |
33 | * @tfrctx_p: current loss event rate (5.4) | |
34 | * @tfrctx_rto: estimate of RTO, equals 4*RTT (4.3) | |
35 | * @tfrctx_ipi: inter-packet interval (4.6) | |
1a21e49a GR |
36 | * |
37 | * Note: X and X_recv are both maintained in units of 64 * bytes/second. This | |
38 | * enables a finer resolution of sending rates and avoids problems with | |
39 | * integer arithmetic; u32 is not sufficient as scaling consumes 6 bits. | |
d61c167d | 40 | */ |
65299d6c | 41 | struct tfrc_tx_info { |
1a21e49a GR |
42 | __u64 tfrctx_x; |
43 | __u64 tfrctx_x_recv; | |
65299d6c ACM |
44 | __u32 tfrctx_x_calc; |
45 | __u32 tfrctx_rtt; | |
46 | __u32 tfrctx_p; | |
47 | __u32 tfrctx_rto; | |
48 | __u32 tfrctx_ipi; | |
49 | }; | |
50 | ||
51 | #endif /* _LINUX_TFRC_H_ */ |