1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | #ifndef _LINUX_TFRC_H_ |
3 | #define _LINUX_TFRC_H_ |
4 | /* |
5 | * TFRC - Data Structures for the TCP-Friendly Rate Control congestion |
6 | * control mechanism as specified in RFC 3448. |
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 |
12 | */ |
13 | #include <linux/types.h> |
14 | |
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 | */ |
21 | struct tfrc_rx_info { |
22 | __u32 tfrcrx_x_recv; |
23 | __u32 tfrcrx_rtt; |
24 | __u32 tfrcrx_p; |
25 | }; |
26 | |
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) |
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. |
40 | */ |
41 | struct tfrc_tx_info { |
42 | __u64 tfrctx_x; |
43 | __u64 tfrctx_x_recv; |
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_ */ |
52 | |