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